5432 lines
140 KiB
C
5432 lines
140 KiB
C
/****************************************************************************
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* Realmode X86 Emulator Library
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*
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* Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
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* Jason Jin <Jason.jin@freescale.com>
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*
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* Copyright (C) 1991-2004 SciTech Software, Inc.
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* Copyright (C) David Mosberger-Tang
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* Copyright (C) 1999 Egbert Eich
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*
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* ========================================================================
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of the authors not be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The authors makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*
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* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* ========================================================================
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*
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* Language: ANSI C
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* Environment: Any
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* Developer: Kendall Bennett
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*
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* Description: This file includes subroutines to implement the decoding
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* and emulation of all the x86 processor instructions.
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*
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* There are approximately 250 subroutines in here, which correspond
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* to the 256 byte-"opcodes" found on the 8086. The table which
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* dispatches this is found in the files optab.[ch].
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*
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* Each opcode proc has a comment preceeding it which gives it's table
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* address. Several opcodes are missing (undefined) in the table.
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*
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* Each proc includes information for decoding (DECODE_PRINTF and
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* DECODE_PRINTF2), debugging (TRACE_REGS, SINGLE_STEP), and misc
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* functions (START_OF_INSTR, END_OF_INSTR).
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*
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* Many of the procedures are *VERY* similar in coding. This has
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* allowed for a very large amount of code to be generated in a fairly
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* short amount of time (i.e. cut, paste, and modify). The result is
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* that much of the code below could have been folded into subroutines
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* for a large reduction in size of this file. The downside would be
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* that there would be a penalty in execution speed. The file could
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* also have been *MUCH* larger by inlining certain functions which
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* were called. This could have resulted even faster execution. The
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* prime directive I used to decide whether to inline the code or to
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* modularize it, was basically: 1) no unnecessary subroutine calls,
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* 2) no routines more than about 200 lines in size, and 3) modularize
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* any code that I might not get right the first time. The fetch_*
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* subroutines fall into the latter category. The The decode_* fall
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* into the second category. The coding of the "switch(mod){ .... }"
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* in many of the subroutines below falls into the first category.
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* Especially, the coding of {add,and,or,sub,...}_{byte,word}
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* subroutines are an especially glaring case of the third guideline.
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* Since so much of the code is cloned from other modules (compare
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* opcode #00 to opcode #01), making the basic operations subroutine
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* calls is especially important; otherwise mistakes in coding an
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* "add" would represent a nightmare in maintenance.
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*
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* Jason ported this file to u-boot. place all the function pointer in
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* the got2 sector. Removed some opcode.
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*
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****************************************************************************/
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#include "x86emu/x86emui.h"
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/*----------------------------- Implementation ----------------------------*/
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/* constant arrays to do several instructions in just one function */
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#ifdef DEBUG
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static char *x86emu_GenOpName[8] = {
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"ADD", "OR", "ADC", "SBB", "AND", "SUB", "XOR", "CMP"};
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#endif
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/* used by several opcodes */
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static u8 (*genop_byte_operation[])(u8 d, u8 s) __attribute__ ((section(".got2"))) =
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{
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add_byte, /* 00 */
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or_byte, /* 01 */
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adc_byte, /* 02 */
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sbb_byte, /* 03 */
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and_byte, /* 04 */
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sub_byte, /* 05 */
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xor_byte, /* 06 */
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cmp_byte, /* 07 */
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};
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static u16 (*genop_word_operation[])(u16 d, u16 s) __attribute__ ((section(".got2"))) =
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{
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add_word, /*00 */
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or_word, /*01 */
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adc_word, /*02 */
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sbb_word, /*03 */
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and_word, /*04 */
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sub_word, /*05 */
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xor_word, /*06 */
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cmp_word, /*07 */
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};
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static u32 (*genop_long_operation[])(u32 d, u32 s) __attribute__ ((section(".got2"))) =
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{
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add_long, /*00 */
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or_long, /*01 */
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adc_long, /*02 */
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sbb_long, /*03 */
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and_long, /*04 */
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sub_long, /*05 */
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xor_long, /*06 */
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cmp_long, /*07 */
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};
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/* used by opcodes 80, c0, d0, and d2. */
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static u8(*opcD0_byte_operation[])(u8 d, u8 s) __attribute__ ((section(".got2"))) =
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{
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rol_byte,
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ror_byte,
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rcl_byte,
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rcr_byte,
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shl_byte,
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shr_byte,
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shl_byte, /* sal_byte === shl_byte by definition */
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sar_byte,
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};
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/* used by opcodes c1, d1, and d3. */
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static u16(*opcD1_word_operation[])(u16 s, u8 d) __attribute__ ((section(".got2"))) =
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{
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rol_word,
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ror_word,
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rcl_word,
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rcr_word,
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shl_word,
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shr_word,
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shl_word, /* sal_byte === shl_byte by definition */
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sar_word,
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};
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/* used by opcodes c1, d1, and d3. */
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static u32 (*opcD1_long_operation[])(u32 s, u8 d) __attribute__ ((section(".got2"))) =
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{
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rol_long,
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ror_long,
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rcl_long,
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rcr_long,
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shl_long,
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shr_long,
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shl_long, /* sal_byte === shl_byte by definition */
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sar_long,
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};
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#ifdef DEBUG
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static char *opF6_names[8] =
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{ "TEST\t", "", "NOT\t", "NEG\t", "MUL\t", "IMUL\t", "DIV\t", "IDIV\t" };
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#endif
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/****************************************************************************
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PARAMETERS:
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op1 - Instruction op code
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REMARKS:
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Handles illegal opcodes.
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****************************************************************************/
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void x86emuOp_illegal_op(
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u8 op1)
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{
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START_OF_INSTR();
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if (M.x86.R_SP != 0) {
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DECODE_PRINTF("ILLEGAL X86 OPCODE\n");
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TRACE_REGS();
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DB( printk("%04x:%04x: %02X ILLEGAL X86 OPCODE!\n",
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M.x86.R_CS, M.x86.R_IP-1,op1));
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HALT_SYS();
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}
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else {
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/* If we get here, it means the stack pointer is back to zero
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* so we are just returning from an emulator service call
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* so therte is no need to display an error message. We trap
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* the emulator with an 0xF1 opcode to finish the service
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* call.
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*/
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X86EMU_halt_sys();
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}
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38
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****************************************************************************/
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void x86emuOp_genop_byte_RM_R(u8 op1)
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{
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int mod, rl, rh;
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uint destoffset;
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u8 *destreg, *srcreg;
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u8 destval;
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op1 = (op1 >> 3) & 0x7;
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START_OF_INSTR();
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\t");
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FETCH_DECODE_MODRM(mod, rh, rl);
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if(mod<3)
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{ destoffset = decode_rmXX_address(mod,rl);
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DECODE_PRINTF(",");
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destval = fetch_data_byte(destoffset);
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srcreg = DECODE_RM_BYTE_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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destval = genop_byte_operation[op1](destval, *srcreg);
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store_data_byte(destoffset, destval);
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}
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else
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{ /* register to register */
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destreg = DECODE_RM_BYTE_REGISTER(rl);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_BYTE_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_byte_operation[op1](*destreg, *srcreg);
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}
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x01, 0x09, 0x11, 0x19, 0x21, 0x29, 0x31, 0x39
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****************************************************************************/
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void x86emuOp_genop_word_RM_R(u8 op1)
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{
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int mod, rl, rh;
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uint destoffset;
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op1 = (op1 >> 3) & 0x7;
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START_OF_INSTR();
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\t");
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FETCH_DECODE_MODRM(mod, rh, rl);
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if(mod<3) {
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destoffset = decode_rmXX_address(mod,rl);
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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u32 destval;
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u32 *srcreg;
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DECODE_PRINTF(",");
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destval = fetch_data_long(destoffset);
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srcreg = DECODE_RM_LONG_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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destval = genop_long_operation[op1](destval, *srcreg);
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store_data_long(destoffset, destval);
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} else {
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u16 destval;
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u16 *srcreg;
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DECODE_PRINTF(",");
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destval = fetch_data_word(destoffset);
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srcreg = DECODE_RM_WORD_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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destval = genop_word_operation[op1](destval, *srcreg);
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store_data_word(destoffset, destval);
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}
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} else { /* register to register */
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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u32 *destreg,*srcreg;
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destreg = DECODE_RM_LONG_REGISTER(rl);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_LONG_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_long_operation[op1](*destreg, *srcreg);
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} else {
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u16 *destreg,*srcreg;
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destreg = DECODE_RM_WORD_REGISTER(rl);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_WORD_REGISTER(rh);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_word_operation[op1](*destreg, *srcreg);
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}
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}
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x02, 0x0a, 0x12, 0x1a, 0x22, 0x2a, 0x32, 0x3a
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****************************************************************************/
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void x86emuOp_genop_byte_R_RM(u8 op1)
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{
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int mod, rl, rh;
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u8 *destreg, *srcreg;
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uint srcoffset;
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u8 srcval;
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op1 = (op1 >> 3) & 0x7;
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START_OF_INSTR();
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\t");
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FETCH_DECODE_MODRM(mod, rh, rl);
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if (mod < 3) {
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destreg = DECODE_RM_BYTE_REGISTER(rh);
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DECODE_PRINTF(",");
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srcoffset = decode_rmXX_address(mod,rl);
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srcval = fetch_data_byte(srcoffset);
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} else { /* register to register */
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destreg = DECODE_RM_BYTE_REGISTER(rh);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_BYTE_REGISTER(rl);
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srcval = *srcreg;
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}
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_byte_operation[op1](*destreg, srcval);
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x03, 0x0b, 0x13, 0x1b, 0x23, 0x2b, 0x33, 0x3b
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****************************************************************************/
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void x86emuOp_genop_word_R_RM(u8 op1)
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{
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int mod, rl, rh;
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uint srcoffset;
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u32 *destreg32, srcval;
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u16 *destreg;
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op1 = (op1 >> 3) & 0x7;
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START_OF_INSTR();
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\t");
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FETCH_DECODE_MODRM(mod, rh, rl);
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if (mod < 3) {
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srcoffset = decode_rmXX_address(mod,rl);
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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destreg32 = DECODE_RM_LONG_REGISTER(rh);
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DECODE_PRINTF(",");
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srcval = fetch_data_long(srcoffset);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg32 = genop_long_operation[op1](*destreg32, srcval);
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} else {
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destreg = DECODE_RM_WORD_REGISTER(rh);
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DECODE_PRINTF(",");
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srcval = fetch_data_word(srcoffset);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_word_operation[op1](*destreg, srcval);
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}
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} else { /* register to register */
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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u32 *srcreg;
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destreg32 = DECODE_RM_LONG_REGISTER(rh);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_LONG_REGISTER(rl);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg32 = genop_long_operation[op1](*destreg32, *srcreg);
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} else {
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u16 *srcreg;
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destreg = DECODE_RM_WORD_REGISTER(rh);
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DECODE_PRINTF(",");
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srcreg = DECODE_RM_WORD_REGISTER(rl);
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DECODE_PRINTF("\n");
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TRACE_AND_STEP();
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*destreg = genop_word_operation[op1](*destreg, *srcreg);
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}
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}
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x04, 0x0c, 0x14, 0x1c, 0x24, 0x2c, 0x34, 0x3c
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****************************************************************************/
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void x86emuOp_genop_byte_AL_IMM(u8 op1)
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{
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u8 srcval;
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op1 = (op1 >> 3) & 0x7;
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START_OF_INSTR();
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\tAL,");
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srcval = fetch_byte_imm();
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DECODE_PRINTF2("%x\n", srcval);
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TRACE_AND_STEP();
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M.x86.R_AL = genop_byte_operation[op1](M.x86.R_AL, srcval);
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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|
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/****************************************************************************
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REMARKS:
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Handles opcodes 0x05, 0x0d, 0x15, 0x1d, 0x25, 0x2d, 0x35, 0x3d
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****************************************************************************/
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void x86emuOp_genop_word_AX_IMM(u8 op1)
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{
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u32 srcval;
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op1 = (op1 >> 3) & 0x7;
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|
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START_OF_INSTR();
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\tEAX,");
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srcval = fetch_long_imm();
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} else {
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DECODE_PRINTF(x86emu_GenOpName[op1]);
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DECODE_PRINTF("\tAX,");
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srcval = fetch_word_imm();
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}
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DECODE_PRINTF2("%x\n", srcval);
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TRACE_AND_STEP();
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if (M.x86.mode & SYSMODE_PREFIX_DATA) {
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M.x86.R_EAX = genop_long_operation[op1](M.x86.R_EAX, srcval);
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} else {
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M.x86.R_AX = genop_word_operation[op1](M.x86.R_AX, (u16)srcval);
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}
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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/****************************************************************************
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REMARKS:
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Handles opcode 0x06
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****************************************************************************/
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void x86emuOp_push_ES(u8 X86EMU_UNUSED(op1))
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{
|
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START_OF_INSTR();
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DECODE_PRINTF("PUSH\tES\n");
|
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TRACE_AND_STEP();
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push_word(M.x86.R_ES);
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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|
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/****************************************************************************
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REMARKS:
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Handles opcode 0x07
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****************************************************************************/
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void x86emuOp_pop_ES(u8 X86EMU_UNUSED(op1))
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{
|
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START_OF_INSTR();
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DECODE_PRINTF("POP\tES\n");
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TRACE_AND_STEP();
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M.x86.R_ES = pop_word();
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DECODE_CLEAR_SEGOVR();
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END_OF_INSTR();
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}
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|
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/****************************************************************************
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|
REMARKS:
|
|
Handles opcode 0x0e
|
|
****************************************************************************/
|
|
void x86emuOp_push_CS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("PUSH\tCS\n");
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_CS);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x0f. Escape for two-byte opcode (286 or better)
|
|
****************************************************************************/
|
|
void x86emuOp_two_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 op2 = (*sys_rdb)(((u32)M.x86.R_CS << 4) + (M.x86.R_IP++));
|
|
INC_DECODED_INST_LEN(1);
|
|
(*x86emu_optab2[op2])(op2);
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x16
|
|
****************************************************************************/
|
|
void x86emuOp_push_SS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("PUSH\tSS\n");
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_SS);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x17
|
|
****************************************************************************/
|
|
void x86emuOp_pop_SS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("POP\tSS\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_SS = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x1e
|
|
****************************************************************************/
|
|
void x86emuOp_push_DS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("PUSH\tDS\n");
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_DS);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x1f
|
|
****************************************************************************/
|
|
void x86emuOp_pop_DS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("POP\tDS\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_DS = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x26
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_ES(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("ES:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_ES;
|
|
/*
|
|
* note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
|
|
* opcode subroutines we do not want to do this.
|
|
*/
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x27
|
|
****************************************************************************/
|
|
void x86emuOp_daa(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("DAA\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AL = daa_byte(M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x2e
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_CS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CS:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_CS;
|
|
/* note no DECODE_CLEAR_SEGOVR here. */
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x2f
|
|
****************************************************************************/
|
|
void x86emuOp_das(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("DAS\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AL = das_byte(M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x36
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_SS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("SS:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_SS;
|
|
/* no DECODE_CLEAR_SEGOVR ! */
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x37
|
|
****************************************************************************/
|
|
void x86emuOp_aaa(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("AAA\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AX = aaa_word(M.x86.R_AX);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x3e
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_DS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("DS:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_DS;
|
|
/* NO DECODE_CLEAR_SEGOVR! */
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x3f
|
|
****************************************************************************/
|
|
void x86emuOp_aas(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("AAS\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AX = aas_word(M.x86.R_AX);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x40 - 0x47
|
|
****************************************************************************/
|
|
void x86emuOp_inc_register(u8 op1)
|
|
{
|
|
START_OF_INSTR();
|
|
op1 &= 0x7;
|
|
DECODE_PRINTF("INC\t");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg;
|
|
reg = DECODE_RM_LONG_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = inc_long(*reg);
|
|
} else {
|
|
u16 *reg;
|
|
reg = DECODE_RM_WORD_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = inc_word(*reg);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x48 - 0x4F
|
|
****************************************************************************/
|
|
void x86emuOp_dec_register(u8 op1)
|
|
{
|
|
START_OF_INSTR();
|
|
op1 &= 0x7;
|
|
DECODE_PRINTF("DEC\t");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg;
|
|
reg = DECODE_RM_LONG_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = dec_long(*reg);
|
|
} else {
|
|
u16 *reg;
|
|
reg = DECODE_RM_WORD_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = dec_word(*reg);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x50 - 0x57
|
|
****************************************************************************/
|
|
void x86emuOp_push_register(u8 op1)
|
|
{
|
|
START_OF_INSTR();
|
|
op1 &= 0x7;
|
|
DECODE_PRINTF("PUSH\t");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg;
|
|
reg = DECODE_RM_LONG_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
push_long(*reg);
|
|
} else {
|
|
u16 *reg;
|
|
reg = DECODE_RM_WORD_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
push_word(*reg);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x58 - 0x5F
|
|
****************************************************************************/
|
|
void x86emuOp_pop_register(u8 op1)
|
|
{
|
|
START_OF_INSTR();
|
|
op1 &= 0x7;
|
|
DECODE_PRINTF("POP\t");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg;
|
|
reg = DECODE_RM_LONG_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = pop_long();
|
|
} else {
|
|
u16 *reg;
|
|
reg = DECODE_RM_WORD_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*reg = pop_word();
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x60
|
|
****************************************************************************/
|
|
void x86emuOp_push_all(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("PUSHAD\n");
|
|
} else {
|
|
DECODE_PRINTF("PUSHA\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 old_sp = M.x86.R_ESP;
|
|
|
|
push_long(M.x86.R_EAX);
|
|
push_long(M.x86.R_ECX);
|
|
push_long(M.x86.R_EDX);
|
|
push_long(M.x86.R_EBX);
|
|
push_long(old_sp);
|
|
push_long(M.x86.R_EBP);
|
|
push_long(M.x86.R_ESI);
|
|
push_long(M.x86.R_EDI);
|
|
} else {
|
|
u16 old_sp = M.x86.R_SP;
|
|
|
|
push_word(M.x86.R_AX);
|
|
push_word(M.x86.R_CX);
|
|
push_word(M.x86.R_DX);
|
|
push_word(M.x86.R_BX);
|
|
push_word(old_sp);
|
|
push_word(M.x86.R_BP);
|
|
push_word(M.x86.R_SI);
|
|
push_word(M.x86.R_DI);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x61
|
|
****************************************************************************/
|
|
void x86emuOp_pop_all(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("POPAD\n");
|
|
} else {
|
|
DECODE_PRINTF("POPA\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EDI = pop_long();
|
|
M.x86.R_ESI = pop_long();
|
|
M.x86.R_EBP = pop_long();
|
|
M.x86.R_ESP += 4; /* skip ESP */
|
|
M.x86.R_EBX = pop_long();
|
|
M.x86.R_EDX = pop_long();
|
|
M.x86.R_ECX = pop_long();
|
|
M.x86.R_EAX = pop_long();
|
|
} else {
|
|
M.x86.R_DI = pop_word();
|
|
M.x86.R_SI = pop_word();
|
|
M.x86.R_BP = pop_word();
|
|
M.x86.R_SP += 2; /* skip SP */
|
|
M.x86.R_BX = pop_word();
|
|
M.x86.R_DX = pop_word();
|
|
M.x86.R_CX = pop_word();
|
|
M.x86.R_AX = pop_word();
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/*opcode 0x62 ILLEGAL OP, calls x86emuOp_illegal_op() */
|
|
/*opcode 0x63 ILLEGAL OP, calls x86emuOp_illegal_op() */
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x64
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_FS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("FS:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_FS;
|
|
/*
|
|
* note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
|
|
* opcode subroutines we do not want to do this.
|
|
*/
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x65
|
|
****************************************************************************/
|
|
void x86emuOp_segovr_GS(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("GS:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_SEGOVR_GS;
|
|
/*
|
|
* note the lack of DECODE_CLEAR_SEGOVR(r) since, here is one of 4
|
|
* opcode subroutines we do not want to do this.
|
|
*/
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x66 - prefix for 32-bit register
|
|
****************************************************************************/
|
|
void x86emuOp_prefix_data(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("DATA:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_PREFIX_DATA;
|
|
/* note no DECODE_CLEAR_SEGOVR here. */
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x67 - prefix for 32-bit address
|
|
****************************************************************************/
|
|
void x86emuOp_prefix_addr(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("ADDR:\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_PREFIX_ADDR;
|
|
/* note no DECODE_CLEAR_SEGOVR here. */
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x68
|
|
****************************************************************************/
|
|
void x86emuOp_push_word_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 imm;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
imm = fetch_long_imm();
|
|
} else {
|
|
imm = fetch_word_imm();
|
|
}
|
|
DECODE_PRINTF2("PUSH\t%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
push_long(imm);
|
|
} else {
|
|
push_word((u16)imm);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x69
|
|
****************************************************************************/
|
|
void x86emuOp_imul_word_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint srcoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IMUL\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 srcval;
|
|
u32 res_lo,res_hi;
|
|
s32 imm;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_data_long(srcoffset);
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
imul_long_direct(&res_lo,&res_hi,(s32)srcval,(s32)imm);
|
|
if ((((res_lo & 0x80000000) == 0) && (res_hi == 0x00000000)) ||
|
|
(((res_lo & 0x80000000) != 0) && (res_hi == 0xFFFFFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u32)res_lo;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 srcval;
|
|
u32 res;
|
|
s16 imm;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_data_word(srcoffset);
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
res = (s16)srcval * (s16)imm;
|
|
if ((((res & 0x8000) == 0) && ((res >> 16) == 0x0000)) ||
|
|
(((res & 0x8000) != 0) && ((res >> 16) == 0xFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u16)res;
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg,*srcreg;
|
|
u32 res_lo,res_hi;
|
|
s32 imm;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rl);
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
imul_long_direct(&res_lo,&res_hi,(s32)*srcreg,(s32)imm);
|
|
if ((((res_lo & 0x80000000) == 0) && (res_hi == 0x00000000)) ||
|
|
(((res_lo & 0x80000000) != 0) && (res_hi == 0xFFFFFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u32)res_lo;
|
|
} else {
|
|
u16 *destreg,*srcreg;
|
|
u32 res;
|
|
s16 imm;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rl);
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
res = (s16)*srcreg * (s16)imm;
|
|
if ((((res & 0x8000) == 0) && ((res >> 16) == 0x0000)) ||
|
|
(((res & 0x8000) != 0) && ((res >> 16) == 0xFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u16)res;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6a
|
|
****************************************************************************/
|
|
void x86emuOp_push_byte_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s16 imm;
|
|
|
|
START_OF_INSTR();
|
|
imm = (s8)fetch_byte_imm();
|
|
DECODE_PRINTF2("PUSH\t%d\n", imm);
|
|
TRACE_AND_STEP();
|
|
push_word(imm);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6b
|
|
****************************************************************************/
|
|
void x86emuOp_imul_byte_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint srcoffset;
|
|
s8 imm;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IMUL\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 srcval;
|
|
u32 res_lo,res_hi;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_data_long(srcoffset);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
imul_long_direct(&res_lo,&res_hi,(s32)srcval,(s32)imm);
|
|
if ((((res_lo & 0x80000000) == 0) && (res_hi == 0x00000000)) ||
|
|
(((res_lo & 0x80000000) != 0) && (res_hi == 0xFFFFFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u32)res_lo;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 srcval;
|
|
u32 res;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_data_word(srcoffset);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
res = (s16)srcval * (s16)imm;
|
|
if ((((res & 0x8000) == 0) && ((res >> 16) == 0x0000)) ||
|
|
(((res & 0x8000) != 0) && ((res >> 16) == 0xFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u16)res;
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg,*srcreg;
|
|
u32 res_lo,res_hi;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rl);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
imul_long_direct(&res_lo,&res_hi,(s32)*srcreg,(s32)imm);
|
|
if ((((res_lo & 0x80000000) == 0) && (res_hi == 0x00000000)) ||
|
|
(((res_lo & 0x80000000) != 0) && (res_hi == 0xFFFFFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u32)res_lo;
|
|
} else {
|
|
u16 *destreg,*srcreg;
|
|
u32 res;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rl);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%d\n", (s32)imm);
|
|
TRACE_AND_STEP();
|
|
res = (s16)*srcreg * (s16)imm;
|
|
if ((((res & 0x8000) == 0) && ((res >> 16) == 0x0000)) ||
|
|
(((res & 0x8000) != 0) && ((res >> 16) == 0xFFFF))) {
|
|
CLEAR_FLAG(F_CF);
|
|
CLEAR_FLAG(F_OF);
|
|
} else {
|
|
SET_FLAG(F_CF);
|
|
SET_FLAG(F_OF);
|
|
}
|
|
*destreg = (u16)res;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6c
|
|
****************************************************************************/
|
|
void x86emuOp_ins_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("INSB\n");
|
|
ins(1);
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6d
|
|
****************************************************************************/
|
|
void x86emuOp_ins_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("INSD\n");
|
|
ins(4);
|
|
} else {
|
|
DECODE_PRINTF("INSW\n");
|
|
ins(2);
|
|
}
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6e
|
|
****************************************************************************/
|
|
void x86emuOp_outs_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("OUTSB\n");
|
|
outs(1);
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x6f
|
|
****************************************************************************/
|
|
void x86emuOp_outs_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("OUTSD\n");
|
|
outs(4);
|
|
} else {
|
|
DECODE_PRINTF("OUTSW\n");
|
|
outs(2);
|
|
}
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x70 - 0x7F
|
|
****************************************************************************/
|
|
int x86emu_check_jump_condition(u8 op);
|
|
|
|
void x86emuOp_jump_near_cond(u8 op1)
|
|
{
|
|
s8 offset;
|
|
u16 target;
|
|
int cond;
|
|
|
|
/* jump to byte offset if overflow flag is set */
|
|
START_OF_INSTR();
|
|
cond = x86emu_check_jump_condition(op1 & 0xF);
|
|
offset = (s8)fetch_byte_imm();
|
|
target = (u16)(M.x86.R_IP + (s16)offset);
|
|
DECODE_PRINTF2("%x\n", target);
|
|
TRACE_AND_STEP();
|
|
if (cond)
|
|
M.x86.R_IP = target;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x80
|
|
****************************************************************************/
|
|
void x86emuOp_opc80_byte_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 imm;
|
|
u8 destval;
|
|
|
|
/*
|
|
* Weirdo special case instruction format. Part of the opcode
|
|
* held below in "RH". Doubly nested case would result, except
|
|
* that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ADD\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("OR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("ADC\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("SBB\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("AND\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SUB\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("XOR\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("CMP\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_byte(destoffset);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_byte_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_byte_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x81
|
|
****************************************************************************/
|
|
void x86emuOp_opc81_word_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
/*
|
|
* Weirdo special case instruction format. Part of the opcode
|
|
* held below in "RH". Doubly nested case would result, except
|
|
* that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ADD\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("OR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("ADC\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("SBB\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("AND\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SUB\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("XOR\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("CMP\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/*
|
|
* Know operation, decode the mod byte to find the addressing
|
|
* mode.
|
|
*/
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval,imm;
|
|
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_long(destoffset);
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_long_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval,imm;
|
|
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_word(destoffset);
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_word_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 destval,imm;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_long_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 destval,imm;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_word_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x82
|
|
****************************************************************************/
|
|
void x86emuOp_opc82_byte_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 imm;
|
|
u8 destval;
|
|
|
|
/*
|
|
* Weirdo special case instruction format. Part of the opcode
|
|
* held below in "RH". Doubly nested case would result, except
|
|
* that the decoded instruction Similar to opcode 81, except that
|
|
* the immediate byte is sign extended to a word length.
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ADD\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("OR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("ADC\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("SBB\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("AND\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SUB\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("XOR\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("CMP\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
destval = fetch_data_byte(destoffset);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_byte_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_byte_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x83
|
|
****************************************************************************/
|
|
void x86emuOp_opc83_word_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
/*
|
|
* Weirdo special case instruction format. Part of the opcode
|
|
* held below in "RH". Doubly nested case would result, except
|
|
* that the decoded instruction Similar to opcode 81, except that
|
|
* the immediate byte is sign extended to a word length.
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ADD\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("OR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("ADC\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("SBB\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("AND\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SUB\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("XOR\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("CMP\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod,rl);
|
|
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval,imm;
|
|
|
|
destval = fetch_data_long(destoffset);
|
|
imm = (s8) fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_long_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval,imm;
|
|
|
|
destval = fetch_data_word(destoffset);
|
|
imm = (s8) fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_word_operation[rh]) (destval, imm);
|
|
if (rh != 7)
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 destval,imm;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
imm = (s8) fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_long_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 destval,imm;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
imm = (s8) fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
destval = (*genop_word_operation[rh]) (*destreg, imm);
|
|
if (rh != 7)
|
|
*destreg = destval;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x84
|
|
****************************************************************************/
|
|
void x86emuOp_test_byte_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg, *srcreg;
|
|
uint destoffset;
|
|
u8 destval;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("TEST\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_byte(destoffset);
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_byte(destval, *srcreg);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_byte(*destreg, *srcreg);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x85
|
|
****************************************************************************/
|
|
void x86emuOp_test_word_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("TEST\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
u32 *srcreg;
|
|
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_long(destoffset);
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_long(destval, *srcreg);
|
|
} else {
|
|
u16 destval;
|
|
u16 *srcreg;
|
|
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_word(destoffset);
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_word(destval, *srcreg);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg,*srcreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_long(*destreg, *srcreg);
|
|
} else {
|
|
u16 *destreg,*srcreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
test_word(*destreg, *srcreg);
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x86
|
|
****************************************************************************/
|
|
void x86emuOp_xchg_byte_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg, *srcreg;
|
|
uint destoffset;
|
|
u8 destval;
|
|
u8 tmp;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("XCHG\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
destval = fetch_data_byte(destoffset);
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = destval;
|
|
destval = tmp;
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = *destreg;
|
|
*destreg = tmp;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x87
|
|
****************************************************************************/
|
|
void x86emuOp_xchg_word_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("XCHG\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *srcreg;
|
|
u32 destval,tmp;
|
|
|
|
destval = fetch_data_long(destoffset);
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = destval;
|
|
destval = tmp;
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 *srcreg;
|
|
u16 destval,tmp;
|
|
|
|
destval = fetch_data_word(destoffset);
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = destval;
|
|
destval = tmp;
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg,*srcreg;
|
|
u32 tmp;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = *destreg;
|
|
*destreg = tmp;
|
|
} else {
|
|
u16 *destreg,*srcreg;
|
|
u16 tmp;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = *srcreg;
|
|
*srcreg = *destreg;
|
|
*destreg = tmp;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x88
|
|
****************************************************************************/
|
|
void x86emuOp_mov_byte_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg, *srcreg;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
store_data_byte(destoffset, *srcreg);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x89
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_RM_R(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *srcreg;
|
|
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
store_data_long(destoffset, *srcreg);
|
|
} else {
|
|
u16 *srcreg;
|
|
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
store_data_word(destoffset, *srcreg);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg,*srcreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
} else {
|
|
u16 *destreg,*srcreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8a
|
|
****************************************************************************/
|
|
void x86emuOp_mov_byte_R_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg, *srcreg;
|
|
uint srcoffset;
|
|
u8 srcval;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
srcval = fetch_data_byte(srcoffset);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = srcval;
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8b
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_R_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint srcoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 srcval;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
srcval = fetch_data_long(srcoffset);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = srcval;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 srcval;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
srcval = fetch_data_word(srcoffset);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = srcval;
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg, *srcreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
} else {
|
|
u16 *destreg, *srcreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8c
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_RM_SR(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u16 *destreg, *srcreg;
|
|
uint destoffset;
|
|
u16 destval;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = decode_rm_seg_register(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = *srcreg;
|
|
store_data_word(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",");
|
|
srcreg = decode_rm_seg_register(rh);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8d
|
|
****************************************************************************/
|
|
void x86emuOp_lea_word_R_M(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u16 *srcreg;
|
|
uint destoffset;
|
|
|
|
/*
|
|
* TODO: Need to handle address size prefix!
|
|
*
|
|
* lea eax,[eax+ebx*2] ??
|
|
*/
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LEA\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
srcreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*srcreg = (u16)destoffset;
|
|
}
|
|
/* } else { undefined. Do nothing. } */
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8e
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_SR_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u16 *destreg, *srcreg;
|
|
uint srcoffset;
|
|
u16 srcval;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
destreg = decode_rm_seg_register(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
srcval = fetch_data_word(srcoffset);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = srcval;
|
|
} else { /* register to register */
|
|
destreg = decode_rm_seg_register(rh);
|
|
DECODE_PRINTF(",");
|
|
srcreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = *srcreg;
|
|
}
|
|
/*
|
|
* Clean up, and reset all the R_xSP pointers to the correct
|
|
* locations. This is about 3x too much overhead (doing all the
|
|
* segreg ptrs when only one is needed, but this instruction
|
|
* *cannot* be that common, and this isn't too much work anyway.
|
|
*/
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x8f
|
|
****************************************************************************/
|
|
void x86emuOp_pop_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("POP\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (rh != 0) {
|
|
DECODE_PRINTF("ILLEGAL DECODE OF OPCODE 8F\n");
|
|
HALT_SYS();
|
|
}
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = pop_long();
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = pop_word();
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = pop_long();
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = pop_word();
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x90
|
|
****************************************************************************/
|
|
void x86emuOp_nop(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("NOP\n");
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x91-0x97
|
|
****************************************************************************/
|
|
void x86emuOp_xchg_word_AX_register(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 tmp;
|
|
|
|
op1 &= 0x7;
|
|
|
|
START_OF_INSTR();
|
|
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg32;
|
|
DECODE_PRINTF("XCHG\tEAX,");
|
|
reg32 = DECODE_RM_LONG_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = M.x86.R_EAX;
|
|
M.x86.R_EAX = *reg32;
|
|
*reg32 = tmp;
|
|
} else {
|
|
u16 *reg16;
|
|
DECODE_PRINTF("XCHG\tAX,");
|
|
reg16 = DECODE_RM_WORD_REGISTER(op1);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
tmp = M.x86.R_AX;
|
|
M.x86.R_EAX = *reg16;
|
|
*reg16 = (u16)tmp;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x98
|
|
****************************************************************************/
|
|
void x86emuOp_cbw(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("CWDE\n");
|
|
} else {
|
|
DECODE_PRINTF("CBW\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
if (M.x86.R_AX & 0x8000) {
|
|
M.x86.R_EAX |= 0xffff0000;
|
|
} else {
|
|
M.x86.R_EAX &= 0x0000ffff;
|
|
}
|
|
} else {
|
|
if (M.x86.R_AL & 0x80) {
|
|
M.x86.R_AH = 0xff;
|
|
} else {
|
|
M.x86.R_AH = 0x0;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x99
|
|
****************************************************************************/
|
|
void x86emuOp_cwd(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("CDQ\n");
|
|
} else {
|
|
DECODE_PRINTF("CWD\n");
|
|
}
|
|
DECODE_PRINTF("CWD\n");
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
if (M.x86.R_EAX & 0x80000000) {
|
|
M.x86.R_EDX = 0xffffffff;
|
|
} else {
|
|
M.x86.R_EDX = 0x0;
|
|
}
|
|
} else {
|
|
if (M.x86.R_AX & 0x8000) {
|
|
M.x86.R_DX = 0xffff;
|
|
} else {
|
|
M.x86.R_DX = 0x0;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9a
|
|
****************************************************************************/
|
|
void x86emuOp_call_far_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 farseg, faroff;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CALL\t");
|
|
faroff = fetch_word_imm();
|
|
farseg = fetch_word_imm();
|
|
DECODE_PRINTF2("%04x:", farseg);
|
|
DECODE_PRINTF2("%04x\n", faroff);
|
|
CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, farseg, faroff, "FAR ");
|
|
|
|
/* XXX
|
|
*
|
|
* Hooked interrupt vectors calling into our "BIOS" will cause
|
|
* problems unless all intersegment stuff is checked for BIOS
|
|
* access. Check needed here. For moment, let it alone.
|
|
*/
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = farseg;
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = faroff;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9b
|
|
****************************************************************************/
|
|
void x86emuOp_wait(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("WAIT");
|
|
TRACE_AND_STEP();
|
|
/* NADA. */
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9c
|
|
****************************************************************************/
|
|
void x86emuOp_pushf_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 flags;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("PUSHFD\n");
|
|
} else {
|
|
DECODE_PRINTF("PUSHF\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
|
|
/* clear out *all* bits not representing flags, and turn on real bits */
|
|
flags = (M.x86.R_EFLG & F_MSK) | F_ALWAYS_ON;
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
push_long(flags);
|
|
} else {
|
|
push_word((u16)flags);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9d
|
|
****************************************************************************/
|
|
void x86emuOp_popf_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("POPFD\n");
|
|
} else {
|
|
DECODE_PRINTF("POPF\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EFLG = pop_long();
|
|
} else {
|
|
M.x86.R_FLG = pop_word();
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9e
|
|
****************************************************************************/
|
|
void x86emuOp_sahf(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("SAHF\n");
|
|
TRACE_AND_STEP();
|
|
/* clear the lower bits of the flag register */
|
|
M.x86.R_FLG &= 0xffffff00;
|
|
/* or in the AH register into the flags register */
|
|
M.x86.R_FLG |= M.x86.R_AH;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0x9f
|
|
****************************************************************************/
|
|
void x86emuOp_lahf(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LAHF\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AH = (u8)(M.x86.R_FLG & 0xff);
|
|
/*undocumented TC++ behavior??? Nope. It's documented, but
|
|
you have too look real hard to notice it. */
|
|
M.x86.R_AH |= 0x2;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa0
|
|
****************************************************************************/
|
|
void x86emuOp_mov_AL_M_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 offset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\tAL,");
|
|
offset = fetch_word_imm();
|
|
DECODE_PRINTF2("[%04x]\n", offset);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AL = fetch_data_byte(offset);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa1
|
|
****************************************************************************/
|
|
void x86emuOp_mov_AX_M_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 offset;
|
|
|
|
START_OF_INSTR();
|
|
offset = fetch_word_imm();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF2("MOV\tEAX,[%04x]\n", offset);
|
|
} else {
|
|
DECODE_PRINTF2("MOV\tAX,[%04x]\n", offset);
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EAX = fetch_data_long(offset);
|
|
} else {
|
|
M.x86.R_AX = fetch_data_word(offset);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa2
|
|
****************************************************************************/
|
|
void x86emuOp_mov_M_AL_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 offset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
offset = fetch_word_imm();
|
|
DECODE_PRINTF2("[%04x],AL\n", offset);
|
|
TRACE_AND_STEP();
|
|
store_data_byte(offset, M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa3
|
|
****************************************************************************/
|
|
void x86emuOp_mov_M_AX_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 offset;
|
|
|
|
START_OF_INSTR();
|
|
offset = fetch_word_imm();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF2("MOV\t[%04x],EAX\n", offset);
|
|
} else {
|
|
DECODE_PRINTF2("MOV\t[%04x],AX\n", offset);
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
store_data_long(offset, M.x86.R_EAX);
|
|
} else {
|
|
store_data_word(offset, M.x86.R_AX);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa4
|
|
****************************************************************************/
|
|
void x86emuOp_movs_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 val;
|
|
u32 count;
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOVS\tBYTE\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -1;
|
|
else
|
|
inc = 1;
|
|
TRACE_AND_STEP();
|
|
count = 1;
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
count = M.x86.R_CX;
|
|
M.x86.R_CX = 0;
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
}
|
|
while (count--) {
|
|
val = fetch_data_byte(M.x86.R_SI);
|
|
store_data_byte_abs(M.x86.R_ES, M.x86.R_DI, val);
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa5
|
|
****************************************************************************/
|
|
void x86emuOp_movs_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 val;
|
|
int inc;
|
|
u32 count;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("MOVS\tDWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -4;
|
|
else
|
|
inc = 4;
|
|
} else {
|
|
DECODE_PRINTF("MOVS\tWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -2;
|
|
else
|
|
inc = 2;
|
|
}
|
|
TRACE_AND_STEP();
|
|
count = 1;
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
count = M.x86.R_CX;
|
|
M.x86.R_CX = 0;
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
}
|
|
while (count--) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val = fetch_data_long(M.x86.R_SI);
|
|
store_data_long_abs(M.x86.R_ES, M.x86.R_DI, val);
|
|
} else {
|
|
val = fetch_data_word(M.x86.R_SI);
|
|
store_data_word_abs(M.x86.R_ES, M.x86.R_DI, (u16)val);
|
|
}
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa6
|
|
****************************************************************************/
|
|
void x86emuOp_cmps_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s8 val1, val2;
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CMPS\tBYTE\n");
|
|
TRACE_AND_STEP();
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -1;
|
|
else
|
|
inc = 1;
|
|
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* REPE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
val1 = fetch_data_byte(M.x86.R_SI);
|
|
val2 = fetch_data_byte_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_byte(val1, val2);
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
if ( (M.x86.mode & SYSMODE_PREFIX_REPE) && (ACCESS_FLAG(F_ZF) == 0) ) break;
|
|
if ( (M.x86.mode & SYSMODE_PREFIX_REPNE) && ACCESS_FLAG(F_ZF) ) break;
|
|
}
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
} else {
|
|
val1 = fetch_data_byte(M.x86.R_SI);
|
|
val2 = fetch_data_byte_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_byte(val1, val2);
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa7
|
|
****************************************************************************/
|
|
void x86emuOp_cmps_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 val1,val2;
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("CMPS\tDWORD\n");
|
|
inc = 4;
|
|
} else {
|
|
DECODE_PRINTF("CMPS\tWORD\n");
|
|
inc = 2;
|
|
}
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -inc;
|
|
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* REPE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val1 = fetch_data_long(M.x86.R_SI);
|
|
val2 = fetch_data_long_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_long(val1, val2);
|
|
} else {
|
|
val1 = fetch_data_word(M.x86.R_SI);
|
|
val2 = fetch_data_word_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_word((u16)val1, (u16)val2);
|
|
}
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
if ( (M.x86.mode & SYSMODE_PREFIX_REPE) && ACCESS_FLAG(F_ZF) == 0 ) break;
|
|
if ( (M.x86.mode & SYSMODE_PREFIX_REPNE) && ACCESS_FLAG(F_ZF) ) break;
|
|
}
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
} else {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val1 = fetch_data_long(M.x86.R_SI);
|
|
val2 = fetch_data_long_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_long(val1, val2);
|
|
} else {
|
|
val1 = fetch_data_word(M.x86.R_SI);
|
|
val2 = fetch_data_word_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_word((u16)val1, (u16)val2);
|
|
}
|
|
M.x86.R_SI += inc;
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa8
|
|
****************************************************************************/
|
|
void x86emuOp_test_AL_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int imm;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("TEST\tAL,");
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2("%04x\n", imm);
|
|
TRACE_AND_STEP();
|
|
test_byte(M.x86.R_AL, (u8)imm);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xa9
|
|
****************************************************************************/
|
|
void x86emuOp_test_AX_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 srcval;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("TEST\tEAX,");
|
|
srcval = fetch_long_imm();
|
|
} else {
|
|
DECODE_PRINTF("TEST\tAX,");
|
|
srcval = fetch_word_imm();
|
|
}
|
|
DECODE_PRINTF2("%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
test_long(M.x86.R_EAX, srcval);
|
|
} else {
|
|
test_word(M.x86.R_AX, (u16)srcval);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xaa
|
|
****************************************************************************/
|
|
void x86emuOp_stos_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("STOS\tBYTE\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -1;
|
|
else
|
|
inc = 1;
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
store_data_byte_abs(M.x86.R_ES, M.x86.R_DI, M.x86.R_AL);
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_DI += inc;
|
|
}
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
} else {
|
|
store_data_byte_abs(M.x86.R_ES, M.x86.R_DI, M.x86.R_AL);
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xab
|
|
****************************************************************************/
|
|
void x86emuOp_stos_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int inc;
|
|
u32 count;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("STOS\tDWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -4;
|
|
else
|
|
inc = 4;
|
|
} else {
|
|
DECODE_PRINTF("STOS\tWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -2;
|
|
else
|
|
inc = 2;
|
|
}
|
|
TRACE_AND_STEP();
|
|
count = 1;
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
count = M.x86.R_CX;
|
|
M.x86.R_CX = 0;
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
}
|
|
while (count--) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
store_data_long_abs(M.x86.R_ES, M.x86.R_DI, M.x86.R_EAX);
|
|
} else {
|
|
store_data_word_abs(M.x86.R_ES, M.x86.R_DI, M.x86.R_AX);
|
|
}
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xac
|
|
****************************************************************************/
|
|
void x86emuOp_lods_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LODS\tBYTE\n");
|
|
TRACE_AND_STEP();
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -1;
|
|
else
|
|
inc = 1;
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
M.x86.R_AL = fetch_data_byte(M.x86.R_SI);
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_SI += inc;
|
|
}
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
} else {
|
|
M.x86.R_AL = fetch_data_byte(M.x86.R_SI);
|
|
M.x86.R_SI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xad
|
|
****************************************************************************/
|
|
void x86emuOp_lods_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int inc;
|
|
u32 count;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("LODS\tDWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -4;
|
|
else
|
|
inc = 4;
|
|
} else {
|
|
DECODE_PRINTF("LODS\tWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -2;
|
|
else
|
|
inc = 2;
|
|
}
|
|
TRACE_AND_STEP();
|
|
count = 1;
|
|
if (M.x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
|
|
/* dont care whether REPE or REPNE */
|
|
/* move them until CX is ZERO. */
|
|
count = M.x86.R_CX;
|
|
M.x86.R_CX = 0;
|
|
M.x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
|
|
}
|
|
while (count--) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EAX = fetch_data_long(M.x86.R_SI);
|
|
} else {
|
|
M.x86.R_AX = fetch_data_word(M.x86.R_SI);
|
|
}
|
|
M.x86.R_SI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xae
|
|
****************************************************************************/
|
|
void x86emuOp_scas_byte(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s8 val2;
|
|
int inc;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("SCAS\tBYTE\n");
|
|
TRACE_AND_STEP();
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -1;
|
|
else
|
|
inc = 1;
|
|
if (M.x86.mode & SYSMODE_PREFIX_REPE) {
|
|
/* REPE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
val2 = fetch_data_byte_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_byte(M.x86.R_AL, val2);
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_DI += inc;
|
|
if (ACCESS_FLAG(F_ZF) == 0)
|
|
break;
|
|
}
|
|
M.x86.mode &= ~SYSMODE_PREFIX_REPE;
|
|
} else if (M.x86.mode & SYSMODE_PREFIX_REPNE) {
|
|
/* REPNE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
val2 = fetch_data_byte_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_byte(M.x86.R_AL, val2);
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_DI += inc;
|
|
if (ACCESS_FLAG(F_ZF))
|
|
break; /* zero flag set means equal */
|
|
}
|
|
M.x86.mode &= ~SYSMODE_PREFIX_REPNE;
|
|
} else {
|
|
val2 = fetch_data_byte_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_byte(M.x86.R_AL, val2);
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xaf
|
|
****************************************************************************/
|
|
void x86emuOp_scas_word(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int inc;
|
|
u32 val;
|
|
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("SCAS\tDWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -4;
|
|
else
|
|
inc = 4;
|
|
} else {
|
|
DECODE_PRINTF("SCAS\tWORD\n");
|
|
if (ACCESS_FLAG(F_DF)) /* down */
|
|
inc = -2;
|
|
else
|
|
inc = 2;
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_REPE) {
|
|
/* REPE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val = fetch_data_long_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_long(M.x86.R_EAX, val);
|
|
} else {
|
|
val = fetch_data_word_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_word(M.x86.R_AX, (u16)val);
|
|
}
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_DI += inc;
|
|
if (ACCESS_FLAG(F_ZF) == 0)
|
|
break;
|
|
}
|
|
M.x86.mode &= ~SYSMODE_PREFIX_REPE;
|
|
} else if (M.x86.mode & SYSMODE_PREFIX_REPNE) {
|
|
/* REPNE */
|
|
/* move them until CX is ZERO. */
|
|
while (M.x86.R_CX != 0) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val = fetch_data_long_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_long(M.x86.R_EAX, val);
|
|
} else {
|
|
val = fetch_data_word_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_word(M.x86.R_AX, (u16)val);
|
|
}
|
|
M.x86.R_CX -= 1;
|
|
M.x86.R_DI += inc;
|
|
if (ACCESS_FLAG(F_ZF))
|
|
break; /* zero flag set means equal */
|
|
}
|
|
M.x86.mode &= ~SYSMODE_PREFIX_REPNE;
|
|
} else {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
val = fetch_data_long_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_long(M.x86.R_EAX, val);
|
|
} else {
|
|
val = fetch_data_word_abs(M.x86.R_ES, M.x86.R_DI);
|
|
cmp_word(M.x86.R_AX, (u16)val);
|
|
}
|
|
M.x86.R_DI += inc;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xb0 - 0xb7
|
|
****************************************************************************/
|
|
void x86emuOp_mov_byte_register_IMM(u8 op1)
|
|
{
|
|
u8 imm, *ptr;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
ptr = DECODE_RM_BYTE_REGISTER(op1 & 0x7);
|
|
DECODE_PRINTF(",");
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
*ptr = imm;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xb8 - 0xbf
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_register_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u32 srcval;
|
|
|
|
op1 &= 0x7;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *reg32;
|
|
reg32 = DECODE_RM_LONG_REGISTER(op1);
|
|
srcval = fetch_long_imm();
|
|
DECODE_PRINTF2(",%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
*reg32 = srcval;
|
|
} else {
|
|
u16 *reg16;
|
|
reg16 = DECODE_RM_WORD_REGISTER(op1);
|
|
srcval = fetch_word_imm();
|
|
DECODE_PRINTF2(",%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
*reg16 = (u16)srcval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc0
|
|
****************************************************************************/
|
|
void x86emuOp_opcC0_byte_RM_MEM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 destval;
|
|
u8 amt;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
destval = fetch_data_byte(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (destval, amt);
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (*destreg, amt);
|
|
*destreg = destval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc1
|
|
****************************************************************************/
|
|
void x86emuOp_opcC1_word_RM_MEM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
u8 amt;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_long_operation[rh]) (destval, amt);
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
DECODE_PRINTF("WORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_word_operation[rh]) (destval, amt);
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
TRACE_AND_STEP();
|
|
*destreg = (*opcD1_long_operation[rh]) (*destreg, amt);
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
amt = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%x\n", amt);
|
|
TRACE_AND_STEP();
|
|
*destreg = (*opcD1_word_operation[rh]) (*destreg, amt);
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc2
|
|
****************************************************************************/
|
|
void x86emuOp_ret_near_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 imm;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("RET\t");
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
RETURN_TRACE("RET",M.x86.saved_cs,M.x86.saved_ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = pop_word();
|
|
M.x86.R_SP += imm;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc3
|
|
****************************************************************************/
|
|
void x86emuOp_ret_near(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("RET\n");
|
|
RETURN_TRACE("RET",M.x86.saved_cs,M.x86.saved_ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc4
|
|
****************************************************************************/
|
|
void x86emuOp_les_R_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rh, rl;
|
|
u16 *dstreg;
|
|
uint srcoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LES\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
dstreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*dstreg = fetch_data_word(srcoffset);
|
|
M.x86.R_ES = fetch_data_word(srcoffset + 2);
|
|
}
|
|
/* else UNDEFINED! register to register */
|
|
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc5
|
|
****************************************************************************/
|
|
void x86emuOp_lds_R_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rh, rl;
|
|
u16 *dstreg;
|
|
uint srcoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LDS\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (mod < 3) {
|
|
dstreg = DECODE_RM_WORD_REGISTER(rh);
|
|
DECODE_PRINTF(",");
|
|
srcoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*dstreg = fetch_data_word(srcoffset);
|
|
M.x86.R_DS = fetch_data_word(srcoffset + 2);
|
|
}
|
|
/* else UNDEFINED! */
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc6
|
|
****************************************************************************/
|
|
void x86emuOp_mov_byte_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 imm;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (rh != 0) {
|
|
DECODE_PRINTF("ILLEGAL DECODE OF OPCODE c6\n");
|
|
HALT_SYS();
|
|
}
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%2x\n", imm);
|
|
TRACE_AND_STEP();
|
|
store_data_byte(destoffset, imm);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
imm = fetch_byte_imm();
|
|
DECODE_PRINTF2(",%2x\n", imm);
|
|
TRACE_AND_STEP();
|
|
*destreg = imm;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc7
|
|
****************************************************************************/
|
|
void x86emuOp_mov_word_RM_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("MOV\t");
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
if (rh != 0) {
|
|
DECODE_PRINTF("ILLEGAL DECODE OF OPCODE 8F\n");
|
|
HALT_SYS();
|
|
}
|
|
if (mod < 3) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 imm;
|
|
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
store_data_long(destoffset, imm);
|
|
} else {
|
|
u16 imm;
|
|
|
|
DECODE_PRINTF("WORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
store_data_word(destoffset, imm);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 imm;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
imm = fetch_long_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
*destreg = imm;
|
|
} else {
|
|
u16 *destreg;
|
|
u16 imm;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2(",%x\n", imm);
|
|
TRACE_AND_STEP();
|
|
*destreg = imm;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc8
|
|
****************************************************************************/
|
|
void x86emuOp_enter(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 local,frame_pointer;
|
|
u8 nesting;
|
|
int i;
|
|
|
|
START_OF_INSTR();
|
|
local = fetch_word_imm();
|
|
nesting = fetch_byte_imm();
|
|
DECODE_PRINTF2("ENTER %x\n", local);
|
|
DECODE_PRINTF2(",%x\n", nesting);
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_BP);
|
|
frame_pointer = M.x86.R_SP;
|
|
if (nesting > 0) {
|
|
for (i = 1; i < nesting; i++) {
|
|
M.x86.R_BP -= 2;
|
|
push_word(fetch_data_word_abs(M.x86.R_SS, M.x86.R_BP));
|
|
}
|
|
push_word(frame_pointer);
|
|
}
|
|
M.x86.R_BP = frame_pointer;
|
|
M.x86.R_SP = (u16)(M.x86.R_SP - local);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xc9
|
|
****************************************************************************/
|
|
void x86emuOp_leave(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LEAVE\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_SP = M.x86.R_BP;
|
|
M.x86.R_BP = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xca
|
|
****************************************************************************/
|
|
void x86emuOp_ret_far_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 imm;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("RETF\t");
|
|
imm = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", imm);
|
|
RETURN_TRACE("RETF",M.x86.saved_cs,M.x86.saved_ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = pop_word();
|
|
M.x86.R_CS = pop_word();
|
|
M.x86.R_SP += imm;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xcb
|
|
****************************************************************************/
|
|
void x86emuOp_ret_far(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("RETF\n");
|
|
RETURN_TRACE("RETF",M.x86.saved_cs,M.x86.saved_ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = pop_word();
|
|
M.x86.R_CS = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xcc
|
|
****************************************************************************/
|
|
void x86emuOp_int3(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 tmp;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("INT 3\n");
|
|
tmp = (u16) mem_access_word(3 * 4 + 2);
|
|
/* access the segment register */
|
|
TRACE_AND_STEP();
|
|
if (_X86EMU_intrTab[3]) {
|
|
(*_X86EMU_intrTab[3])(3);
|
|
} else {
|
|
push_word((u16)M.x86.R_FLG);
|
|
CLEAR_FLAG(F_IF);
|
|
CLEAR_FLAG(F_TF);
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = mem_access_word(3 * 4 + 2);
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = mem_access_word(3 * 4);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xcd
|
|
****************************************************************************/
|
|
void x86emuOp_int_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 tmp;
|
|
u8 intnum;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("INT\t");
|
|
intnum = fetch_byte_imm();
|
|
DECODE_PRINTF2("%x\n", intnum);
|
|
tmp = mem_access_word(intnum * 4 + 2);
|
|
TRACE_AND_STEP();
|
|
if (_X86EMU_intrTab[intnum]) {
|
|
(*_X86EMU_intrTab[intnum])(intnum);
|
|
} else {
|
|
push_word((u16)M.x86.R_FLG);
|
|
CLEAR_FLAG(F_IF);
|
|
CLEAR_FLAG(F_TF);
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = mem_access_word(intnum * 4 + 2);
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = mem_access_word(intnum * 4);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xce
|
|
****************************************************************************/
|
|
void x86emuOp_into(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 tmp;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("INTO\n");
|
|
TRACE_AND_STEP();
|
|
if (ACCESS_FLAG(F_OF)) {
|
|
tmp = mem_access_word(4 * 4 + 2);
|
|
if (_X86EMU_intrTab[4]) {
|
|
(*_X86EMU_intrTab[4])(4);
|
|
} else {
|
|
push_word((u16)M.x86.R_FLG);
|
|
CLEAR_FLAG(F_IF);
|
|
CLEAR_FLAG(F_TF);
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = mem_access_word(4 * 4 + 2);
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = mem_access_word(4 * 4);
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xcf
|
|
****************************************************************************/
|
|
void x86emuOp_iret(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IRET\n");
|
|
|
|
TRACE_AND_STEP();
|
|
|
|
M.x86.R_IP = pop_word();
|
|
M.x86.R_CS = pop_word();
|
|
M.x86.R_FLG = pop_word();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd0
|
|
****************************************************************************/
|
|
void x86emuOp_opcD0_byte_RM_1(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 destval;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",1\n");
|
|
destval = fetch_data_byte(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (destval, 1);
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",1\n");
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (*destreg, 1);
|
|
*destreg = destval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd1
|
|
****************************************************************************/
|
|
void x86emuOp_opcD1_word_RM_1(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
if (mod < 3) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",1\n");
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_long_operation[rh]) (destval, 1);
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
DECODE_PRINTF("WORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",1\n");
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_word_operation[rh]) (destval, 1);
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",1\n");
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_long_operation[rh]) (*destreg, 1);
|
|
*destreg = destval;
|
|
} else {
|
|
u16 destval;
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",1\n");
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_word_operation[rh]) (*destreg, 1);
|
|
*destreg = destval;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd2
|
|
****************************************************************************/
|
|
void x86emuOp_opcD2_byte_RM_CL(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 destval;
|
|
u8 amt;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
amt = M.x86.R_CL;
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
destval = fetch_data_byte(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (destval, amt);
|
|
store_data_byte(destoffset, destval);
|
|
} else { /* register to register */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD0_byte_operation[rh]) (*destreg, amt);
|
|
*destreg = destval;
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd3
|
|
****************************************************************************/
|
|
void x86emuOp_opcD3_word_RM_CL(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
u8 amt;
|
|
|
|
/*
|
|
* Yet another weirdo special case instruction format. Part of
|
|
* the opcode held below in "RH". Doubly nested case would
|
|
* result, except that the decoded instruction
|
|
*/
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("ROL\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ROR\t");
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("RCL\t");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("RCR\t");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("SHL\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("SHR\t");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("SAL\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("SAR\t");
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
/* know operation, decode the mod byte to find the addressing
|
|
mode. */
|
|
amt = M.x86.R_CL;
|
|
if (mod < 3) {
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_long_operation[rh]) (destval, amt);
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
DECODE_PRINTF("WORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = (*opcD1_word_operation[rh]) (destval, amt);
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
} else { /* register to register */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = (*opcD1_long_operation[rh]) (*destreg, amt);
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF(",CL\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = (*opcD1_word_operation[rh]) (*destreg, amt);
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd4
|
|
****************************************************************************/
|
|
void x86emuOp_aam(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 a;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("AAM\n");
|
|
a = fetch_byte_imm(); /* this is a stupid encoding. */
|
|
if (a != 10) {
|
|
DECODE_PRINTF("ERROR DECODING AAM\n");
|
|
TRACE_REGS();
|
|
HALT_SYS();
|
|
}
|
|
TRACE_AND_STEP();
|
|
/* note the type change here --- returning AL and AH in AX. */
|
|
M.x86.R_AX = aam_word(M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd5
|
|
****************************************************************************/
|
|
void x86emuOp_aad(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 a;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("AAD\n");
|
|
a = fetch_byte_imm();
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AX = aad_word(M.x86.R_AX);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/* opcode 0xd6 ILLEGAL OPCODE */
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xd7
|
|
****************************************************************************/
|
|
void x86emuOp_xlat(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 addr;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("XLAT\n");
|
|
TRACE_AND_STEP();
|
|
addr = (u16)(M.x86.R_BX + (u8)M.x86.R_AL);
|
|
M.x86.R_AL = fetch_data_byte(addr);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/* instuctions D8 .. DF are in i87_ops.c */
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe0
|
|
****************************************************************************/
|
|
void x86emuOp_loopne(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s16 ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LOOPNE\t");
|
|
ip = (s8) fetch_byte_imm();
|
|
ip += (s16) M.x86.R_IP;
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_CX -= 1;
|
|
if (M.x86.R_CX != 0 && !ACCESS_FLAG(F_ZF)) /* CX != 0 and !ZF */
|
|
M.x86.R_IP = ip;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe1
|
|
****************************************************************************/
|
|
void x86emuOp_loope(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s16 ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LOOPE\t");
|
|
ip = (s8) fetch_byte_imm();
|
|
ip += (s16) M.x86.R_IP;
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_CX -= 1;
|
|
if (M.x86.R_CX != 0 && ACCESS_FLAG(F_ZF)) /* CX != 0 and ZF */
|
|
M.x86.R_IP = ip;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe2
|
|
****************************************************************************/
|
|
void x86emuOp_loop(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s16 ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LOOP\t");
|
|
ip = (s8) fetch_byte_imm();
|
|
ip += (s16) M.x86.R_IP;
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_CX -= 1;
|
|
if (M.x86.R_CX != 0)
|
|
M.x86.R_IP = ip;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe3
|
|
****************************************************************************/
|
|
void x86emuOp_jcxz(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 target;
|
|
s8 offset;
|
|
|
|
/* jump to byte offset if overflow flag is set */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("JCXZ\t");
|
|
offset = (s8)fetch_byte_imm();
|
|
target = (u16)(M.x86.R_IP + offset);
|
|
DECODE_PRINTF2("%x\n", target);
|
|
TRACE_AND_STEP();
|
|
if (M.x86.R_CX == 0)
|
|
M.x86.R_IP = target;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe4
|
|
****************************************************************************/
|
|
void x86emuOp_in_byte_AL_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 port;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IN\t");
|
|
port = (u8) fetch_byte_imm();
|
|
DECODE_PRINTF2("%x,AL\n", port);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AL = (*sys_inb)(port);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe5
|
|
****************************************************************************/
|
|
void x86emuOp_in_word_AX_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 port;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IN\t");
|
|
port = (u8) fetch_byte_imm();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF2("EAX,%x\n", port);
|
|
} else {
|
|
DECODE_PRINTF2("AX,%x\n", port);
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EAX = (*sys_inl)(port);
|
|
} else {
|
|
M.x86.R_AX = (*sys_inw)(port);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe6
|
|
****************************************************************************/
|
|
void x86emuOp_out_byte_IMM_AL(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 port;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("OUT\t");
|
|
port = (u8) fetch_byte_imm();
|
|
DECODE_PRINTF2("%x,AL\n", port);
|
|
TRACE_AND_STEP();
|
|
(*sys_outb)(port, M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe7
|
|
****************************************************************************/
|
|
void x86emuOp_out_word_IMM_AX(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u8 port;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("OUT\t");
|
|
port = (u8) fetch_byte_imm();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF2("%x,EAX\n", port);
|
|
} else {
|
|
DECODE_PRINTF2("%x,AX\n", port);
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
(*sys_outl)(port, M.x86.R_EAX);
|
|
} else {
|
|
(*sys_outw)(port, M.x86.R_AX);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe8
|
|
****************************************************************************/
|
|
void x86emuOp_call_near_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
s16 ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CALL\t");
|
|
ip = (s16) fetch_word_imm();
|
|
ip += (s16) M.x86.R_IP; /* CHECK SIGN */
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
CALL_TRACE(M.x86.saved_cs, M.x86.saved_ip, M.x86.R_CS, ip, "");
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = ip;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xe9
|
|
****************************************************************************/
|
|
void x86emuOp_jump_near_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("JMP\t");
|
|
ip = (s16)fetch_word_imm();
|
|
ip += (s16)M.x86.R_IP;
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = (u16)ip;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xea
|
|
****************************************************************************/
|
|
void x86emuOp_jump_far_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 cs, ip;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("JMP\tFAR ");
|
|
ip = fetch_word_imm();
|
|
cs = fetch_word_imm();
|
|
DECODE_PRINTF2("%04x:", cs);
|
|
DECODE_PRINTF2("%04x\n", ip);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = ip;
|
|
M.x86.R_CS = cs;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xeb
|
|
****************************************************************************/
|
|
void x86emuOp_jump_byte_IMM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
u16 target;
|
|
s8 offset;
|
|
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("JMP\t");
|
|
offset = (s8)fetch_byte_imm();
|
|
target = (u16)(M.x86.R_IP + offset);
|
|
DECODE_PRINTF2("%x\n", target);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = target;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xec
|
|
****************************************************************************/
|
|
void x86emuOp_in_byte_AL_DX(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("IN\tAL,DX\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_AL = (*sys_inb)(M.x86.R_DX);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xed
|
|
****************************************************************************/
|
|
void x86emuOp_in_word_AX_DX(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("IN\tEAX,DX\n");
|
|
} else {
|
|
DECODE_PRINTF("IN\tAX,DX\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
M.x86.R_EAX = (*sys_inl)(M.x86.R_DX);
|
|
} else {
|
|
M.x86.R_AX = (*sys_inw)(M.x86.R_DX);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xee
|
|
****************************************************************************/
|
|
void x86emuOp_out_byte_DX_AL(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("OUT\tDX,AL\n");
|
|
TRACE_AND_STEP();
|
|
(*sys_outb)(M.x86.R_DX, M.x86.R_AL);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xef
|
|
****************************************************************************/
|
|
void x86emuOp_out_word_DX_AX(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("OUT\tDX,EAX\n");
|
|
} else {
|
|
DECODE_PRINTF("OUT\tDX,AX\n");
|
|
}
|
|
TRACE_AND_STEP();
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
(*sys_outl)(M.x86.R_DX, M.x86.R_EAX);
|
|
} else {
|
|
(*sys_outw)(M.x86.R_DX, M.x86.R_AX);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf0
|
|
****************************************************************************/
|
|
void x86emuOp_lock(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("LOCK:\n");
|
|
TRACE_AND_STEP();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/*opcode 0xf1 ILLEGAL OPERATION */
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf2
|
|
****************************************************************************/
|
|
void x86emuOp_repne(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("REPNE\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_PREFIX_REPNE;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf3
|
|
****************************************************************************/
|
|
void x86emuOp_repe(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("REPE\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.mode |= SYSMODE_PREFIX_REPE;
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf4
|
|
****************************************************************************/
|
|
void x86emuOp_halt(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("HALT\n");
|
|
TRACE_AND_STEP();
|
|
HALT_SYS();
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf5
|
|
****************************************************************************/
|
|
void x86emuOp_cmc(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* complement the carry flag. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CMC\n");
|
|
TRACE_AND_STEP();
|
|
TOGGLE_FLAG(F_CF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf6
|
|
****************************************************************************/
|
|
void x86emuOp_opcF6_byte_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
u8 *destreg;
|
|
uint destoffset;
|
|
u8 destval, srcval;
|
|
|
|
/* long, drawn out code follows. Double switch for a total
|
|
of 32 cases. */
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
DECODE_PRINTF(opF6_names[rh]);
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
destval = fetch_data_byte(destoffset);
|
|
|
|
switch (rh) {
|
|
case 0: /* test byte imm */
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_byte_imm();
|
|
DECODE_PRINTF2("%02x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_byte(destval, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F6\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = not_byte(destval);
|
|
store_data_byte(destoffset, destval);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = neg_byte(destval);
|
|
store_data_byte(destoffset, destval);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_byte(destval);
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_byte(destval);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_byte(destval);
|
|
break;
|
|
default:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_byte(destval);
|
|
break;
|
|
}
|
|
} else { /* mod=11 */
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
switch (rh) {
|
|
case 0: /* test byte imm */
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_byte_imm();
|
|
DECODE_PRINTF2("%02x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_byte(*destreg, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F6\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = not_byte(*destreg);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = neg_byte(*destreg);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_byte(*destreg); /*!!! */
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_byte(*destreg);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_byte(*destreg);
|
|
break;
|
|
default:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_byte(*destreg);
|
|
break;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf7
|
|
****************************************************************************/
|
|
void x86emuOp_opcF7_word_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rl, rh;
|
|
uint destoffset;
|
|
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
DECODE_PRINTF(opF6_names[rh]);
|
|
if (mod < 3) {
|
|
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval, srcval;
|
|
|
|
DECODE_PRINTF("DWORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
destval = fetch_data_long(destoffset);
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_long_imm();
|
|
DECODE_PRINTF2("%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_long(destval, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F7\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = not_long(destval);
|
|
store_data_long(destoffset, destval);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = neg_long(destval);
|
|
store_data_long(destoffset, destval);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_long(destval);
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_long(destval);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_long(destval);
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_long(destval);
|
|
break;
|
|
}
|
|
} else {
|
|
u16 destval, srcval;
|
|
|
|
DECODE_PRINTF("WORD PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
destval = fetch_data_word(destoffset);
|
|
|
|
switch (rh) {
|
|
case 0: /* test word imm */
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_word(destval, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F7\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = not_word(destval);
|
|
store_data_word(destoffset, destval);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
destval = neg_word(destval);
|
|
store_data_word(destoffset, destval);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_word(destval);
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_word(destval);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_word(destval);
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_word(destval);
|
|
break;
|
|
}
|
|
}
|
|
|
|
} else { /* mod=11 */
|
|
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
u32 srcval;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
|
|
switch (rh) {
|
|
case 0: /* test word imm */
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_long_imm();
|
|
DECODE_PRINTF2("%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_long(*destreg, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F6\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = not_long(*destreg);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = neg_long(*destreg);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_long(*destreg); /*!!! */
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_long(*destreg);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_long(*destreg);
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_long(*destreg);
|
|
break;
|
|
}
|
|
} else {
|
|
u16 *destreg;
|
|
u16 srcval;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
|
|
switch (rh) {
|
|
case 0: /* test word imm */
|
|
DECODE_PRINTF(",");
|
|
srcval = fetch_word_imm();
|
|
DECODE_PRINTF2("%x\n", srcval);
|
|
TRACE_AND_STEP();
|
|
test_word(*destreg, srcval);
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("ILLEGAL OP MOD=00 RH=01 OP=F6\n");
|
|
HALT_SYS();
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = not_word(*destreg);
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = neg_word(*destreg);
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
mul_word(*destreg); /*!!! */
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
imul_word(*destreg);
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
div_word(*destreg);
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
idiv_word(*destreg);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf8
|
|
****************************************************************************/
|
|
void x86emuOp_clc(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* clear the carry flag. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CLC\n");
|
|
TRACE_AND_STEP();
|
|
CLEAR_FLAG(F_CF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xf9
|
|
****************************************************************************/
|
|
void x86emuOp_stc(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* set the carry flag. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("STC\n");
|
|
TRACE_AND_STEP();
|
|
SET_FLAG(F_CF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xfa
|
|
****************************************************************************/
|
|
void x86emuOp_cli(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* clear interrupts. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CLI\n");
|
|
TRACE_AND_STEP();
|
|
CLEAR_FLAG(F_IF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xfb
|
|
****************************************************************************/
|
|
void x86emuOp_sti(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* enable interrupts. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("STI\n");
|
|
TRACE_AND_STEP();
|
|
SET_FLAG(F_IF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xfc
|
|
****************************************************************************/
|
|
void x86emuOp_cld(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* clear interrupts. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("CLD\n");
|
|
TRACE_AND_STEP();
|
|
CLEAR_FLAG(F_DF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xfd
|
|
****************************************************************************/
|
|
void x86emuOp_std(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
/* clear interrupts. */
|
|
START_OF_INSTR();
|
|
DECODE_PRINTF("STD\n");
|
|
TRACE_AND_STEP();
|
|
SET_FLAG(F_DF);
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xfe
|
|
****************************************************************************/
|
|
void x86emuOp_opcFE_byte_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rh, rl;
|
|
u8 destval;
|
|
uint destoffset;
|
|
u8 *destreg;
|
|
|
|
/* Yet another special case instruction. */
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
DECODE_PRINTF("INC\t");
|
|
break;
|
|
case 1:
|
|
DECODE_PRINTF("DEC\t");
|
|
break;
|
|
case 2:
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
DECODE_PRINTF2("ILLEGAL OP MAJOR OP 0xFE MINOR OP %x \n", mod);
|
|
HALT_SYS();
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
if (mod < 3) {
|
|
DECODE_PRINTF("BYTE PTR ");
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF("\n");
|
|
destval = fetch_data_byte(destoffset);
|
|
TRACE_AND_STEP();
|
|
if (rh == 0)
|
|
destval = inc_byte(destval);
|
|
else
|
|
destval = dec_byte(destval);
|
|
store_data_byte(destoffset, destval);
|
|
} else {
|
|
destreg = DECODE_RM_BYTE_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
if (rh == 0)
|
|
*destreg = inc_byte(*destreg);
|
|
else
|
|
*destreg = dec_byte(*destreg);
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/****************************************************************************
|
|
REMARKS:
|
|
Handles opcode 0xff
|
|
****************************************************************************/
|
|
void x86emuOp_opcFF_word_RM(u8 X86EMU_UNUSED(op1))
|
|
{
|
|
int mod, rh, rl;
|
|
uint destoffset = 0;
|
|
u16 *destreg;
|
|
u16 destval,destval2;
|
|
|
|
/* Yet another special case instruction. */
|
|
START_OF_INSTR();
|
|
FETCH_DECODE_MODRM(mod, rh, rl);
|
|
#ifdef DEBUG
|
|
if (DEBUG_DECODE()) {
|
|
/* XXX DECODE_PRINTF may be changed to something more
|
|
general, so that it is important to leave the strings
|
|
in the same format, even though the result is that the
|
|
above test is done twice. */
|
|
|
|
switch (rh) {
|
|
case 0:
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("INC\tDWORD PTR ");
|
|
} else {
|
|
DECODE_PRINTF("INC\tWORD PTR ");
|
|
}
|
|
break;
|
|
case 1:
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
DECODE_PRINTF("DEC\tDWORD PTR ");
|
|
} else {
|
|
DECODE_PRINTF("DEC\tWORD PTR ");
|
|
}
|
|
break;
|
|
case 2:
|
|
DECODE_PRINTF("CALL\t ");
|
|
break;
|
|
case 3:
|
|
DECODE_PRINTF("CALL\tFAR ");
|
|
break;
|
|
case 4:
|
|
DECODE_PRINTF("JMP\t");
|
|
break;
|
|
case 5:
|
|
DECODE_PRINTF("JMP\tFAR ");
|
|
break;
|
|
case 6:
|
|
DECODE_PRINTF("PUSH\t");
|
|
break;
|
|
case 7:
|
|
DECODE_PRINTF("ILLEGAL DECODING OF OPCODE FF\t");
|
|
HALT_SYS();
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
if (mod < 3) {
|
|
destoffset = decode_rmXX_address(mod, rl);
|
|
DECODE_PRINTF("\n");
|
|
switch (rh) {
|
|
case 0: /* inc word ptr ... */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = inc_long(destval);
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = inc_word(destval);
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
break;
|
|
case 1: /* dec word ptr ... */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = dec_long(destval);
|
|
store_data_long(destoffset, destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
destval = dec_word(destval);
|
|
store_data_word(destoffset, destval);
|
|
}
|
|
break;
|
|
case 2: /* call word ptr ... */
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = destval;
|
|
break;
|
|
case 3: /* call far ptr ... */
|
|
destval = fetch_data_word(destoffset);
|
|
destval2 = fetch_data_word(destoffset + 2);
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_CS);
|
|
M.x86.R_CS = destval2;
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = destval;
|
|
break;
|
|
case 4: /* jmp word ptr ... */
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = destval;
|
|
break;
|
|
case 5: /* jmp far ptr ... */
|
|
destval = fetch_data_word(destoffset);
|
|
destval2 = fetch_data_word(destoffset + 2);
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = destval;
|
|
M.x86.R_CS = destval2;
|
|
break;
|
|
case 6: /* push word ptr ... */
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 destval;
|
|
|
|
destval = fetch_data_long(destoffset);
|
|
TRACE_AND_STEP();
|
|
push_long(destval);
|
|
} else {
|
|
u16 destval;
|
|
|
|
destval = fetch_data_word(destoffset);
|
|
TRACE_AND_STEP();
|
|
push_word(destval);
|
|
}
|
|
break;
|
|
}
|
|
} else {
|
|
switch (rh) {
|
|
case 0:
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = inc_long(*destreg);
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = inc_word(*destreg);
|
|
}
|
|
break;
|
|
case 1:
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = dec_long(*destreg);
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
*destreg = dec_word(*destreg);
|
|
}
|
|
break;
|
|
case 2: /* call word ptr ... */
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
push_word(M.x86.R_IP);
|
|
M.x86.R_IP = *destreg;
|
|
break;
|
|
case 3: /* jmp far ptr ... */
|
|
DECODE_PRINTF("OPERATION UNDEFINED 0XFF \n");
|
|
TRACE_AND_STEP();
|
|
HALT_SYS();
|
|
break;
|
|
|
|
case 4: /* jmp ... */
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
M.x86.R_IP = (u16) (*destreg);
|
|
break;
|
|
case 5: /* jmp far ptr ... */
|
|
DECODE_PRINTF("OPERATION UNDEFINED 0XFF \n");
|
|
TRACE_AND_STEP();
|
|
HALT_SYS();
|
|
break;
|
|
case 6:
|
|
if (M.x86.mode & SYSMODE_PREFIX_DATA) {
|
|
u32 *destreg;
|
|
|
|
destreg = DECODE_RM_LONG_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
push_long(*destreg);
|
|
} else {
|
|
u16 *destreg;
|
|
|
|
destreg = DECODE_RM_WORD_REGISTER(rl);
|
|
DECODE_PRINTF("\n");
|
|
TRACE_AND_STEP();
|
|
push_word(*destreg);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
DECODE_CLEAR_SEGOVR();
|
|
END_OF_INSTR();
|
|
}
|
|
|
|
/***************************************************************************
|
|
* Single byte operation code table:
|
|
**************************************************************************/
|
|
void (*x86emu_optab[256])(u8) __attribute__ ((section(".got2"))) =
|
|
{
|
|
/* 0x00 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x01 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x02 */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x03 */ x86emuOp_genop_word_R_RM,
|
|
/* 0x04 */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x05 */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x06 */ x86emuOp_push_ES,
|
|
/* 0x07 */ x86emuOp_pop_ES,
|
|
|
|
/* 0x08 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x09 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x0a */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x0b */ x86emuOp_genop_word_R_RM,
|
|
/* 0x0c */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x0d */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x0e */ x86emuOp_push_CS,
|
|
/* 0x0f */ x86emuOp_two_byte,
|
|
|
|
/* 0x10 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x11 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x12 */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x13 */ x86emuOp_genop_word_R_RM,
|
|
/* 0x14 */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x15 */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x16 */ x86emuOp_push_SS,
|
|
/* 0x17 */ x86emuOp_pop_SS,
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|
|
|
/* 0x18 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x19 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x1a */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x1b */ x86emuOp_genop_word_R_RM,
|
|
/* 0x1c */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x1d */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x1e */ x86emuOp_push_DS,
|
|
/* 0x1f */ x86emuOp_pop_DS,
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|
|
|
/* 0x20 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x21 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x22 */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x23 */ x86emuOp_genop_word_R_RM,
|
|
/* 0x24 */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x25 */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x26 */ x86emuOp_segovr_ES,
|
|
/* 0x27 */ x86emuOp_daa,
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|
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|
/* 0x28 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x29 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x2a */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x2b */ x86emuOp_genop_word_R_RM,
|
|
/* 0x2c */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x2d */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x2e */ x86emuOp_segovr_CS,
|
|
/* 0x2f */ x86emuOp_das,
|
|
|
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/* 0x30 */ x86emuOp_genop_byte_RM_R,
|
|
/* 0x31 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x32 */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x33 */ x86emuOp_genop_word_R_RM,
|
|
/* 0x34 */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x35 */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x36 */ x86emuOp_segovr_SS,
|
|
/* 0x37 */ x86emuOp_aaa,
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|
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|
/* 0x38 */ x86emuOp_genop_byte_RM_R,
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|
/* 0x39 */ x86emuOp_genop_word_RM_R,
|
|
/* 0x3a */ x86emuOp_genop_byte_R_RM,
|
|
/* 0x3b */ x86emuOp_genop_word_R_RM,
|
|
/* 0x3c */ x86emuOp_genop_byte_AL_IMM,
|
|
/* 0x3d */ x86emuOp_genop_word_AX_IMM,
|
|
/* 0x3e */ x86emuOp_segovr_DS,
|
|
/* 0x3f */ x86emuOp_aas,
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|
|
|
/* 0x40 */ x86emuOp_inc_register,
|
|
/* 0x41 */ x86emuOp_inc_register,
|
|
/* 0x42 */ x86emuOp_inc_register,
|
|
/* 0x43 */ x86emuOp_inc_register,
|
|
/* 0x44 */ x86emuOp_inc_register,
|
|
/* 0x45 */ x86emuOp_inc_register,
|
|
/* 0x46 */ x86emuOp_inc_register,
|
|
/* 0x47 */ x86emuOp_inc_register,
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|
|
|
/* 0x48 */ x86emuOp_dec_register,
|
|
/* 0x49 */ x86emuOp_dec_register,
|
|
/* 0x4a */ x86emuOp_dec_register,
|
|
/* 0x4b */ x86emuOp_dec_register,
|
|
/* 0x4c */ x86emuOp_dec_register,
|
|
/* 0x4d */ x86emuOp_dec_register,
|
|
/* 0x4e */ x86emuOp_dec_register,
|
|
/* 0x4f */ x86emuOp_dec_register,
|
|
|
|
/* 0x50 */ x86emuOp_push_register,
|
|
/* 0x51 */ x86emuOp_push_register,
|
|
/* 0x52 */ x86emuOp_push_register,
|
|
/* 0x53 */ x86emuOp_push_register,
|
|
/* 0x54 */ x86emuOp_push_register,
|
|
/* 0x55 */ x86emuOp_push_register,
|
|
/* 0x56 */ x86emuOp_push_register,
|
|
/* 0x57 */ x86emuOp_push_register,
|
|
|
|
/* 0x58 */ x86emuOp_pop_register,
|
|
/* 0x59 */ x86emuOp_pop_register,
|
|
/* 0x5a */ x86emuOp_pop_register,
|
|
/* 0x5b */ x86emuOp_pop_register,
|
|
/* 0x5c */ x86emuOp_pop_register,
|
|
/* 0x5d */ x86emuOp_pop_register,
|
|
/* 0x5e */ x86emuOp_pop_register,
|
|
/* 0x5f */ x86emuOp_pop_register,
|
|
|
|
/* 0x60 */ x86emuOp_push_all,
|
|
/* 0x61 */ x86emuOp_pop_all,
|
|
/* 0x62 */ x86emuOp_illegal_op, /* bound */
|
|
/* 0x63 */ x86emuOp_illegal_op, /* arpl */
|
|
/* 0x64 */ x86emuOp_segovr_FS,
|
|
/* 0x65 */ x86emuOp_segovr_GS,
|
|
/* 0x66 */ x86emuOp_prefix_data,
|
|
/* 0x67 */ x86emuOp_prefix_addr,
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|
|
|
/* 0x68 */ x86emuOp_push_word_IMM,
|
|
/* 0x69 */ x86emuOp_imul_word_IMM,
|
|
/* 0x6a */ x86emuOp_push_byte_IMM,
|
|
/* 0x6b */ x86emuOp_imul_byte_IMM,
|
|
/* 0x6c */ x86emuOp_ins_byte,
|
|
/* 0x6d */ x86emuOp_ins_word,
|
|
/* 0x6e */ x86emuOp_outs_byte,
|
|
/* 0x6f */ x86emuOp_outs_word,
|
|
|
|
/* 0x70 */ x86emuOp_jump_near_cond,
|
|
/* 0x71 */ x86emuOp_jump_near_cond,
|
|
/* 0x72 */ x86emuOp_jump_near_cond,
|
|
/* 0x73 */ x86emuOp_jump_near_cond,
|
|
/* 0x74 */ x86emuOp_jump_near_cond,
|
|
/* 0x75 */ x86emuOp_jump_near_cond,
|
|
/* 0x76 */ x86emuOp_jump_near_cond,
|
|
/* 0x77 */ x86emuOp_jump_near_cond,
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|
|
|
/* 0x78 */ x86emuOp_jump_near_cond,
|
|
/* 0x79 */ x86emuOp_jump_near_cond,
|
|
/* 0x7a */ x86emuOp_jump_near_cond,
|
|
/* 0x7b */ x86emuOp_jump_near_cond,
|
|
/* 0x7c */ x86emuOp_jump_near_cond,
|
|
/* 0x7d */ x86emuOp_jump_near_cond,
|
|
/* 0x7e */ x86emuOp_jump_near_cond,
|
|
/* 0x7f */ x86emuOp_jump_near_cond,
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|
|
|
/* 0x80 */ x86emuOp_opc80_byte_RM_IMM,
|
|
/* 0x81 */ x86emuOp_opc81_word_RM_IMM,
|
|
/* 0x82 */ x86emuOp_opc82_byte_RM_IMM,
|
|
/* 0x83 */ x86emuOp_opc83_word_RM_IMM,
|
|
/* 0x84 */ x86emuOp_test_byte_RM_R,
|
|
/* 0x85 */ x86emuOp_test_word_RM_R,
|
|
/* 0x86 */ x86emuOp_xchg_byte_RM_R,
|
|
/* 0x87 */ x86emuOp_xchg_word_RM_R,
|
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|
|
/* 0x88 */ x86emuOp_mov_byte_RM_R,
|
|
/* 0x89 */ x86emuOp_mov_word_RM_R,
|
|
/* 0x8a */ x86emuOp_mov_byte_R_RM,
|
|
/* 0x8b */ x86emuOp_mov_word_R_RM,
|
|
/* 0x8c */ x86emuOp_mov_word_RM_SR,
|
|
/* 0x8d */ x86emuOp_lea_word_R_M,
|
|
/* 0x8e */ x86emuOp_mov_word_SR_RM,
|
|
/* 0x8f */ x86emuOp_pop_RM,
|
|
|
|
/* 0x90 */ x86emuOp_nop,
|
|
/* 0x91 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x92 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x93 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x94 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x95 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x96 */ x86emuOp_xchg_word_AX_register,
|
|
/* 0x97 */ x86emuOp_xchg_word_AX_register,
|
|
|
|
/* 0x98 */ x86emuOp_cbw,
|
|
/* 0x99 */ x86emuOp_cwd,
|
|
/* 0x9a */ x86emuOp_call_far_IMM,
|
|
/* 0x9b */ x86emuOp_wait,
|
|
/* 0x9c */ x86emuOp_pushf_word,
|
|
/* 0x9d */ x86emuOp_popf_word,
|
|
/* 0x9e */ x86emuOp_sahf,
|
|
/* 0x9f */ x86emuOp_lahf,
|
|
|
|
/* 0xa0 */ x86emuOp_mov_AL_M_IMM,
|
|
/* 0xa1 */ x86emuOp_mov_AX_M_IMM,
|
|
/* 0xa2 */ x86emuOp_mov_M_AL_IMM,
|
|
/* 0xa3 */ x86emuOp_mov_M_AX_IMM,
|
|
/* 0xa4 */ x86emuOp_movs_byte,
|
|
/* 0xa5 */ x86emuOp_movs_word,
|
|
/* 0xa6 */ x86emuOp_cmps_byte,
|
|
/* 0xa7 */ x86emuOp_cmps_word,
|
|
/* 0xa8 */ x86emuOp_test_AL_IMM,
|
|
/* 0xa9 */ x86emuOp_test_AX_IMM,
|
|
/* 0xaa */ x86emuOp_stos_byte,
|
|
/* 0xab */ x86emuOp_stos_word,
|
|
/* 0xac */ x86emuOp_lods_byte,
|
|
/* 0xad */ x86emuOp_lods_word,
|
|
/* 0xac */ x86emuOp_scas_byte,
|
|
/* 0xad */ x86emuOp_scas_word,
|
|
|
|
/* 0xb0 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb1 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb2 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb3 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb4 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb5 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb6 */ x86emuOp_mov_byte_register_IMM,
|
|
/* 0xb7 */ x86emuOp_mov_byte_register_IMM,
|
|
|
|
/* 0xb8 */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xb9 */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xba */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xbb */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xbc */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xbd */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xbe */ x86emuOp_mov_word_register_IMM,
|
|
/* 0xbf */ x86emuOp_mov_word_register_IMM,
|
|
|
|
/* 0xc0 */ x86emuOp_opcC0_byte_RM_MEM,
|
|
/* 0xc1 */ x86emuOp_opcC1_word_RM_MEM,
|
|
/* 0xc2 */ x86emuOp_ret_near_IMM,
|
|
/* 0xc3 */ x86emuOp_ret_near,
|
|
/* 0xc4 */ x86emuOp_les_R_IMM,
|
|
/* 0xc5 */ x86emuOp_lds_R_IMM,
|
|
/* 0xc6 */ x86emuOp_mov_byte_RM_IMM,
|
|
/* 0xc7 */ x86emuOp_mov_word_RM_IMM,
|
|
/* 0xc8 */ x86emuOp_enter,
|
|
/* 0xc9 */ x86emuOp_leave,
|
|
/* 0xca */ x86emuOp_ret_far_IMM,
|
|
/* 0xcb */ x86emuOp_ret_far,
|
|
/* 0xcc */ x86emuOp_int3,
|
|
/* 0xcd */ x86emuOp_int_IMM,
|
|
/* 0xce */ x86emuOp_into,
|
|
/* 0xcf */ x86emuOp_iret,
|
|
|
|
/* 0xd0 */ x86emuOp_opcD0_byte_RM_1,
|
|
/* 0xd1 */ x86emuOp_opcD1_word_RM_1,
|
|
/* 0xd2 */ x86emuOp_opcD2_byte_RM_CL,
|
|
/* 0xd3 */ x86emuOp_opcD3_word_RM_CL,
|
|
/* 0xd4 */ x86emuOp_aam,
|
|
/* 0xd5 */ x86emuOp_aad,
|
|
/* 0xd6 */ x86emuOp_illegal_op, /* Undocumented SETALC instruction */
|
|
/* 0xd7 */ x86emuOp_xlat,
|
|
/* 0xd8 */ NULL, /*x86emuOp_esc_coprocess_d8,*/
|
|
/* 0xd9 */ NULL, /*x86emuOp_esc_coprocess_d9,*/
|
|
/* 0xda */ NULL, /*x86emuOp_esc_coprocess_da,*/
|
|
/* 0xdb */ NULL, /*x86emuOp_esc_coprocess_db,*/
|
|
/* 0xdc */ NULL, /*x86emuOp_esc_coprocess_dc,*/
|
|
/* 0xdd */ NULL, /*x86emuOp_esc_coprocess_dd,*/
|
|
/* 0xde */ NULL, /*x86emuOp_esc_coprocess_de,*/
|
|
/* 0xdf */ NULL, /*x86emuOp_esc_coprocess_df,*/
|
|
|
|
/* 0xe0 */ x86emuOp_loopne,
|
|
/* 0xe1 */ x86emuOp_loope,
|
|
/* 0xe2 */ x86emuOp_loop,
|
|
/* 0xe3 */ x86emuOp_jcxz,
|
|
/* 0xe4 */ x86emuOp_in_byte_AL_IMM,
|
|
/* 0xe5 */ x86emuOp_in_word_AX_IMM,
|
|
/* 0xe6 */ x86emuOp_out_byte_IMM_AL,
|
|
/* 0xe7 */ x86emuOp_out_word_IMM_AX,
|
|
|
|
/* 0xe8 */ x86emuOp_call_near_IMM,
|
|
/* 0xe9 */ x86emuOp_jump_near_IMM,
|
|
/* 0xea */ x86emuOp_jump_far_IMM,
|
|
/* 0xeb */ x86emuOp_jump_byte_IMM,
|
|
/* 0xec */ x86emuOp_in_byte_AL_DX,
|
|
/* 0xed */ x86emuOp_in_word_AX_DX,
|
|
/* 0xee */ x86emuOp_out_byte_DX_AL,
|
|
/* 0xef */ x86emuOp_out_word_DX_AX,
|
|
|
|
/* 0xf0 */ x86emuOp_lock,
|
|
/* 0xf1 */ x86emuOp_illegal_op,
|
|
/* 0xf2 */ x86emuOp_repne,
|
|
/* 0xf3 */ x86emuOp_repe,
|
|
/* 0xf4 */ x86emuOp_halt,
|
|
/* 0xf5 */ x86emuOp_cmc,
|
|
/* 0xf6 */ x86emuOp_opcF6_byte_RM,
|
|
/* 0xf7 */ x86emuOp_opcF7_word_RM,
|
|
|
|
/* 0xf8 */ x86emuOp_clc,
|
|
/* 0xf9 */ x86emuOp_stc,
|
|
/* 0xfa */ x86emuOp_cli,
|
|
/* 0xfb */ x86emuOp_sti,
|
|
/* 0xfc */ x86emuOp_cld,
|
|
/* 0xfd */ x86emuOp_std,
|
|
/* 0xfe */ x86emuOp_opcFE_byte_RM,
|
|
/* 0xff */ x86emuOp_opcFF_word_RM,
|
|
};
|