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0d32e7d11b
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
1535 lines
50 KiB
C
1535 lines
50 KiB
C
/*
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* arch/arm/kernel/kprobes-decode.c
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*
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* Copyright (C) 2006, 2007 Motorola Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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/*
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* We do not have hardware single-stepping on ARM, This
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* effort is further complicated by the ARM not having a
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* "next PC" register. Instructions that change the PC
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* can't be safely single-stepped in a MP environment, so
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* we have a lot of work to do:
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*
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* In the prepare phase:
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* *) If it is an instruction that does anything
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* with the CPU mode, we reject it for a kprobe.
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* (This is out of laziness rather than need. The
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* instructions could be simulated.)
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*
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* *) Otherwise, decode the instruction rewriting its
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* registers to take fixed, ordered registers and
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* setting a handler for it to run the instruction.
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*
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* In the execution phase by an instruction's handler:
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*
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* *) If the PC is written to by the instruction, the
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* instruction must be fully simulated in software.
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*
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* *) Otherwise, a modified form of the instruction is
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* directly executed. Its handler calls the
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* instruction in insn[0]. In insn[1] is a
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* "mov pc, lr" to return.
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*
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* Before calling, load up the reordered registers
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* from the original instruction's registers. If one
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* of the original input registers is the PC, compute
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* and adjust the appropriate input register.
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*
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* After call completes, copy the output registers to
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* the original instruction's original registers.
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*
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* We don't use a real breakpoint instruction since that
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* would have us in the kernel go from SVC mode to SVC
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* mode losing the link register. Instead we use an
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* undefined instruction. To simplify processing, the
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* undefined instruction used for kprobes must be reserved
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* exclusively for kprobes use.
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*
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* TODO: ifdef out some instruction decoding based on architecture.
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include "kprobes.h"
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#define sign_extend(x, signbit) ((x) | (0 - ((x) & (1 << (signbit)))))
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#define branch_displacement(insn) sign_extend(((insn) & 0xffffff) << 2, 25)
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#if __LINUX_ARM_ARCH__ >= 6
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#define BLX(reg) "blx "reg" \n\t"
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#else
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#define BLX(reg) "mov lr, pc \n\t" \
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"mov pc, "reg" \n\t"
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#endif
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#define is_r15(insn, bitpos) (((insn) & (0xf << bitpos)) == (0xf << bitpos))
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#define PSR_fs (PSR_f|PSR_s)
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#define KPROBE_RETURN_INSTRUCTION 0xe1a0f00e /* mov pc, lr */
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typedef long (insn_0arg_fn_t)(void);
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typedef long (insn_1arg_fn_t)(long);
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typedef long (insn_2arg_fn_t)(long, long);
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typedef long (insn_3arg_fn_t)(long, long, long);
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typedef long (insn_4arg_fn_t)(long, long, long, long);
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typedef long long (insn_llret_0arg_fn_t)(void);
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typedef long long (insn_llret_3arg_fn_t)(long, long, long);
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typedef long long (insn_llret_4arg_fn_t)(long, long, long, long);
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union reg_pair {
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long long dr;
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#ifdef __LITTLE_ENDIAN
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struct { long r0, r1; };
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#else
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struct { long r1, r0; };
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#endif
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};
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/*
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* The insnslot_?arg_r[w]flags() functions below are to keep the
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* msr -> *fn -> mrs instruction sequences indivisible so that
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* the state of the CPSR flags aren't inadvertently modified
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* just before or just after the call.
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*/
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static inline long __kprobes
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insnslot_0arg_rflags(long cpsr, insn_0arg_fn_t *fn)
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{
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_0arg_rflags(long cpsr, insn_llret_0arg_fn_t *fn)
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{
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret0), "=r" (ret1)
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: [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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static inline long __kprobes
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insnslot_1arg_rflags(long r0, long cpsr, insn_1arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), [cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_2arg_rflags(long r0, long r1, long cpsr, insn_2arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_3arg_rflags(long r0, long r1, long r2, long cpsr, insn_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_3arg_rflags(long r0, long r1, long r2, long cpsr,
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insn_llret_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret0), "=r" (ret1)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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static inline long __kprobes
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insnslot_4arg_rflags(long r0, long r1, long r2, long r3, long cpsr,
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insn_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret asm("r0");
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__asm__ __volatile__ (
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"msr cpsr_fs, %[cpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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: "=r" (ret)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[cpsr] "r" (cpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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return ret;
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}
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static inline long __kprobes
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insnslot_1arg_rwflags(long r0, long *cpsr, insn_1arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_2arg_rwflags(long r0, long r1, long *cpsr, insn_2arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), [oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_3arg_rwflags(long r0, long r1, long r2, long *cpsr,
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insn_3arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long __kprobes
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insnslot_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
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insn_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret asm("r0");
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long oldcpsr = *cpsr;
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long newcpsr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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return ret;
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}
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static inline long long __kprobes
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insnslot_llret_4arg_rwflags(long r0, long r1, long r2, long r3, long *cpsr,
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insn_llret_4arg_fn_t *fn)
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{
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register long rr0 asm("r0") = r0;
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register long rr1 asm("r1") = r1;
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register long rr2 asm("r2") = r2;
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register long rr3 asm("r3") = r3;
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register long ret0 asm("r0");
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register long ret1 asm("r1");
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long oldcpsr = *cpsr;
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long newcpsr;
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union reg_pair fnr;
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__asm__ __volatile__ (
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"msr cpsr_fs, %[oldcpsr] \n\t"
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"mov lr, pc \n\t"
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"mov pc, %[fn] \n\t"
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"mrs %[newcpsr], cpsr \n\t"
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: "=r" (ret0), "=r" (ret1), [newcpsr] "=r" (newcpsr)
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: "0" (rr0), "r" (rr1), "r" (rr2), "r" (rr3),
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[oldcpsr] "r" (oldcpsr), [fn] "r" (fn)
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: "lr", "cc"
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);
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*cpsr = (oldcpsr & ~PSR_fs) | (newcpsr & PSR_fs);
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fnr.r0 = ret0;
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fnr.r1 = ret1;
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return fnr.dr;
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}
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/*
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* To avoid the complications of mimicing single-stepping on a
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* processor without a Next-PC or a single-step mode, and to
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* avoid having to deal with the side-effects of boosting, we
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* simulate or emulate (almost) all ARM instructions.
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*
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* "Simulation" is where the instruction's behavior is duplicated in
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* C code. "Emulation" is where the original instruction is rewritten
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* and executed, often by altering its registers.
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*
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* By having all behavior of the kprobe'd instruction completed before
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* returning from the kprobe_handler(), all locks (scheduler and
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* interrupt) can safely be released. There is no need for secondary
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* breakpoints, no race with MP or preemptable kernels, nor having to
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* clean up resources counts at a later time impacting overall system
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* performance. By rewriting the instruction, only the minimum registers
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* need to be loaded and saved back optimizing performance.
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*
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* Calling the insnslot_*_rwflags version of a function doesn't hurt
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* anything even when the CPSR flags aren't updated by the
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* instruction. It's just a little slower in return for saving
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* a little space by not having a duplicate function that doesn't
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* update the flags. (The same optimization can be said for
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* instructions that do or don't perform register writeback)
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* Also, instructions can either read the flags, only write the
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* flags, or read and write the flags. To save combinations
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* rather than for sheer performance, flag functions just assume
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* read and write of flags.
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*/
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static void __kprobes simulate_bbl(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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long iaddr = (long)p->addr;
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int disp = branch_displacement(insn);
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if (insn & (1 << 24))
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regs->ARM_lr = iaddr + 4;
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regs->ARM_pc = iaddr + 8 + disp;
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}
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static void __kprobes simulate_blx1(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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long iaddr = (long)p->addr;
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int disp = branch_displacement(insn);
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regs->ARM_lr = iaddr + 4;
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regs->ARM_pc = iaddr + 8 + disp + ((insn >> 23) & 0x2);
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regs->ARM_cpsr |= PSR_T_BIT;
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}
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static void __kprobes simulate_blx2bx(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
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int rm = insn & 0xf;
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long rmv = regs->uregs[rm];
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if (insn & (1 << 5))
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regs->ARM_lr = (long)p->addr + 4;
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regs->ARM_pc = rmv & ~0x1;
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regs->ARM_cpsr &= ~PSR_T_BIT;
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if (rmv & 0x1)
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regs->ARM_cpsr |= PSR_T_BIT;
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}
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static void __kprobes simulate_mrs(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
unsigned long mask = 0xf8ff03df; /* Mask out execution state */
|
|
regs->uregs[rd] = regs->ARM_cpsr & mask;
|
|
}
|
|
|
|
static void __kprobes simulate_mov_ipsp(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
regs->uregs[12] = regs->uregs[13];
|
|
}
|
|
|
|
static void __kprobes emulate_ldrd(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf; /* rm may be invalid, don't care. */
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
|
|
/* Not following the C calling convention here, so need asm(). */
|
|
__asm__ __volatile__ (
|
|
"ldr r0, %[rn] \n\t"
|
|
"ldr r1, %[rm] \n\t"
|
|
"msr cpsr_fs, %[cpsr]\n\t"
|
|
"mov lr, pc \n\t"
|
|
"mov pc, %[i_fn] \n\t"
|
|
"str r0, %[rn] \n\t" /* in case of writeback */
|
|
"str r2, %[rd0] \n\t"
|
|
"str r3, %[rd1] \n\t"
|
|
: [rn] "+m" (rnv),
|
|
[rd0] "=m" (regs->uregs[rd]),
|
|
[rd1] "=m" (regs->uregs[rd+1])
|
|
: [rm] "m" (rmv),
|
|
[cpsr] "r" (regs->ARM_cpsr),
|
|
[i_fn] "r" (i_fn)
|
|
: "r0", "r1", "r2", "r3", "lr", "cc"
|
|
);
|
|
if (is_writeback(insn))
|
|
regs->uregs[rn] = rnv;
|
|
}
|
|
|
|
static void __kprobes emulate_strd(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_4arg_fn_t *i_fn = (insn_4arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
/* rm/rmv may be invalid, don't care. */
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rnv_wb;
|
|
|
|
rnv_wb = insnslot_4arg_rflags(rnv, rmv, regs->uregs[rd],
|
|
regs->uregs[rd+1],
|
|
regs->ARM_cpsr, i_fn);
|
|
if (is_writeback(insn))
|
|
regs->uregs[rn] = rnv_wb;
|
|
}
|
|
|
|
static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
union reg_pair fnr;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rdv;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long cpsr = regs->ARM_cpsr;
|
|
|
|
fnr.dr = insnslot_llret_3arg_rflags(rnv, 0, rmv, cpsr, i_fn);
|
|
if (rn != 15)
|
|
regs->uregs[rn] = fnr.r0; /* Save Rn in case of writeback. */
|
|
rdv = fnr.r1;
|
|
|
|
if (rd == 15) {
|
|
#if __LINUX_ARM_ARCH__ >= 5
|
|
cpsr &= ~PSR_T_BIT;
|
|
if (rdv & 0x1)
|
|
cpsr |= PSR_T_BIT;
|
|
regs->ARM_cpsr = cpsr;
|
|
rdv &= ~0x1;
|
|
#else
|
|
rdv &= ~0x2;
|
|
#endif
|
|
}
|
|
regs->uregs[rd] = rdv;
|
|
}
|
|
|
|
static void __kprobes emulate_str(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long iaddr = (long)p->addr;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rdv = (rd == 15) ? iaddr + str_pc_offset : regs->uregs[rd];
|
|
long rnv = (rn == 15) ? iaddr + 8 : regs->uregs[rn];
|
|
long rmv = regs->uregs[rm]; /* rm/rmv may be invalid, don't care. */
|
|
long rnv_wb;
|
|
|
|
rnv_wb = insnslot_3arg_rflags(rnv, rdv, rmv, regs->ARM_cpsr, i_fn);
|
|
if (rn != 15)
|
|
regs->uregs[rn] = rnv_wb; /* Save Rn in case of writeback. */
|
|
}
|
|
|
|
static void __kprobes emulate_sat(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rmv = regs->uregs[rm];
|
|
|
|
/* Writes Q flag */
|
|
regs->uregs[rd] = insnslot_1arg_rwflags(rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_sel(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
/* Reads GE bits */
|
|
regs->uregs[rd] = insnslot_2arg_rflags(rnv, rmv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_none(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_0arg_fn_t *i_fn = (insn_0arg_fn_t *)&p->ainsn.insn[0];
|
|
|
|
insnslot_0arg_rflags(regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_nop(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12_modify(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
long rdv = regs->uregs[rd];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rdv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn0_modify(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = insn & 0xf;
|
|
long rdv = regs->uregs[rd];
|
|
long rnv = regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_2arg_rflags(rdv, rnv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes emulate_rd12rm0(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rmv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn16rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_2arg_rwflags(rnv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd16rn12rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 16) & 0xf;
|
|
int rn = (insn >> 12) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rnv = regs->uregs[rn];
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rwflags(rnv, rsv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd16rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_2arg_fn_t *i_fn = (insn_2arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 16) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_2arg_rwflags(rsv, rmv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rdhi16rdlo12rs8rm0_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_llret_4arg_fn_t *i_fn = (insn_llret_4arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
union reg_pair fnr;
|
|
int rdhi = (insn >> 16) & 0xf;
|
|
int rdlo = (insn >> 12) & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
int rm = insn & 0xf;
|
|
long rsv = regs->uregs[rs];
|
|
long rmv = regs->uregs[rm];
|
|
|
|
fnr.dr = insnslot_llret_4arg_rwflags(regs->uregs[rdhi],
|
|
regs->uregs[rdlo], rsv, rmv,
|
|
®s->ARM_cpsr, i_fn);
|
|
regs->uregs[rdhi] = fnr.r0;
|
|
regs->uregs[rdlo] = fnr.r1;
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_imm_rflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rflags(rnv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_imm_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
regs->uregs[rd] = insnslot_1arg_rwflags(rnv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_tests_imm(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_1arg_fn_t *i_fn = (insn_1arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rn = (insn >> 16) & 0xf;
|
|
long rnv = (rn == 15) ? (long)p->addr + 8 : regs->uregs[rn];
|
|
|
|
insnslot_1arg_rwflags(rnv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_rflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf; /* rn/rnv/rs/rsv may be */
|
|
int rs = (insn >> 8) & 0xf; /* invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rflags(rnv, rmv, rsv, regs->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf; /* rn/rnv/rs/rsv may be */
|
|
int rs = (insn >> 8) & 0xf; /* invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
regs->uregs[rd] =
|
|
insnslot_3arg_rwflags(rnv, rmv, rsv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_alu_tests(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
|
|
kprobe_opcode_t insn = p->opcode;
|
|
long ppc = (long)p->addr + 8;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rs = (insn >> 8) & 0xf; /* rs/rsv may be invalid, don't care. */
|
|
int rm = insn & 0xf;
|
|
long rnv = (rn == 15) ? ppc : regs->uregs[rn];
|
|
long rmv = (rm == 15) ? ppc : regs->uregs[rm];
|
|
long rsv = regs->uregs[rs];
|
|
|
|
insnslot_3arg_rwflags(rnv, rmv, rsv, ®s->ARM_cpsr, i_fn);
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
int not_imm = (insn & (1 << 26)) ? (insn & (1 << 25))
|
|
: (~insn & (1 << 22));
|
|
|
|
if (is_writeback(insn) && is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Writeback to PC */
|
|
|
|
insn &= 0xfff00fff;
|
|
insn |= 0x00001000; /* Rn = r0, Rd = r1 */
|
|
if (not_imm) {
|
|
insn &= ~0xf;
|
|
insn |= 2; /* Rm = r2 */
|
|
}
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = (insn & (1 << 20)) ? emulate_ldr : emulate_str;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12_modify(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0fff; /* Rd = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12_modify;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rn0_modify(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0ff0; /* Rd = r0 */
|
|
insn |= 0x00000001; /* Rn = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rn0_modify;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rm0(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xffff0ff0; /* Rd = r0, Rm = r0 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rm0;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd12rn16rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 12))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff00ff0; /* Rd = r0, Rn = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd12rn16rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd16rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff0f0f0; /* Rd = r0, Rs = r0 */
|
|
insn |= 0x00000001; /* Rm = r1 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd16rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rd16rn12rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16))
|
|
return INSN_REJECTED; /* Rd is PC */
|
|
|
|
insn &= 0xfff000f0; /* Rd = r0, Rn = r0 */
|
|
insn |= 0x00000102; /* Rs = r1, Rm = r2 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rd16rn12rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
prep_emulate_rdhi16rdlo12rs8rm0_wflags(kprobe_opcode_t insn,
|
|
struct arch_specific_insn *asi)
|
|
{
|
|
if (is_r15(insn, 16) || is_r15(insn, 12))
|
|
return INSN_REJECTED; /* RdHi or RdLo is PC */
|
|
|
|
insn &= 0xfff000f0; /* RdHi = r0, RdLo = r1 */
|
|
insn |= 0x00001203; /* Rs = r2, Rm = r3 */
|
|
asi->insn[0] = insn;
|
|
asi->insn_handler = emulate_rdhi16rdlo12rs8rm0_rwflags;
|
|
return INSN_GOOD;
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
kprobe_opcode_t insn = p->opcode;
|
|
unsigned long pc = (unsigned long)p->addr + 8;
|
|
int rt = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
|
|
register unsigned long rtv asm("r0") = regs->uregs[rt];
|
|
register unsigned long rt2v asm("r1") = regs->uregs[rt+1];
|
|
register unsigned long rnv asm("r2") = (rn == 15) ? pc
|
|
: regs->uregs[rn];
|
|
register unsigned long rmv asm("r3") = regs->uregs[rm];
|
|
|
|
__asm__ __volatile__ (
|
|
BLX("%[fn]")
|
|
: "=r" (rtv), "=r" (rt2v), "=r" (rnv)
|
|
: "0" (rtv), "1" (rt2v), "2" (rnv), "r" (rmv),
|
|
[fn] "r" (p->ainsn.insn_fn)
|
|
: "lr", "memory", "cc"
|
|
);
|
|
|
|
regs->uregs[rt] = rtv;
|
|
regs->uregs[rt+1] = rt2v;
|
|
if (is_writeback(insn))
|
|
regs->uregs[rn] = rnv;
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
kprobe_opcode_t insn = p->opcode;
|
|
unsigned long pc = (unsigned long)p->addr + 8;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
int rs = (insn >> 8) & 0xf;
|
|
|
|
register unsigned long rdv asm("r0") = regs->uregs[rd];
|
|
register unsigned long rnv asm("r2") = (rn == 15) ? pc
|
|
: regs->uregs[rn];
|
|
register unsigned long rmv asm("r3") = (rm == 15) ? pc
|
|
: regs->uregs[rm];
|
|
register unsigned long rsv asm("r1") = regs->uregs[rs];
|
|
unsigned long cpsr = regs->ARM_cpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
BLX("%[fn]")
|
|
"mrs %[cpsr], cpsr \n\t"
|
|
: "=r" (rdv), [cpsr] "=r" (cpsr)
|
|
: "0" (rdv), "r" (rnv), "r" (rmv), "r" (rsv),
|
|
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
|
|
: "lr", "memory", "cc"
|
|
);
|
|
|
|
if (rd == 15)
|
|
alu_write_pc(rdv, regs);
|
|
else
|
|
regs->uregs[rd] = rdv;
|
|
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
|
|
}
|
|
|
|
static void __kprobes
|
|
emulate_rd12rn16rm0_rwflags_nopc(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
kprobe_opcode_t insn = p->opcode;
|
|
int rd = (insn >> 12) & 0xf;
|
|
int rn = (insn >> 16) & 0xf;
|
|
int rm = insn & 0xf;
|
|
|
|
register unsigned long rdv asm("r0") = regs->uregs[rd];
|
|
register unsigned long rnv asm("r2") = regs->uregs[rn];
|
|
register unsigned long rmv asm("r3") = regs->uregs[rm];
|
|
unsigned long cpsr = regs->ARM_cpsr;
|
|
|
|
__asm__ __volatile__ (
|
|
"msr cpsr_fs, %[cpsr] \n\t"
|
|
BLX("%[fn]")
|
|
"mrs %[cpsr], cpsr \n\t"
|
|
: "=r" (rdv), [cpsr] "=r" (cpsr)
|
|
: "0" (rdv), "r" (rnv), "r" (rmv),
|
|
"1" (cpsr), [fn] "r" (p->ainsn.insn_fn)
|
|
: "lr", "memory", "cc"
|
|
);
|
|
|
|
regs->uregs[rd] = rdv;
|
|
regs->ARM_cpsr = (regs->ARM_cpsr & ~APSR_MASK) | (cpsr & APSR_MASK);
|
|
}
|
|
|
|
/*
|
|
* For the instruction masking and comparisons in all the "space_*"
|
|
* functions below, Do _not_ rearrange the order of tests unless
|
|
* you're very, very sure of what you are doing. For the sake of
|
|
* efficiency, the masks for some tests sometimes assume other test
|
|
* have been done prior to them so the number of patterns to test
|
|
* for an instruction set can be as broad as possible to reduce the
|
|
* number of tests needed.
|
|
*/
|
|
|
|
static const union decode_item arm_1111_table[] = {
|
|
/* Unconditional instructions */
|
|
|
|
/* memory hint 1111 0100 x001 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLDI (immediate) 1111 0100 x101 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLDW (immediate) 1111 0101 x001 xxxx xxxx xxxx xxxx xxxx */
|
|
/* PLD (immediate) 1111 0101 x101 xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_SIMULATE (0xfe300000, 0xf4100000, kprobe_simulate_nop),
|
|
|
|
/* BLX (immediate) 1111 101x xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_SIMULATE (0xfe000000, 0xfa000000, simulate_blx1),
|
|
|
|
/* CPS 1111 0001 0000 xxx0 xxxx xxxx xx0x xxxx */
|
|
/* SETEND 1111 0001 0000 0001 xxxx xxxx 0000 xxxx */
|
|
/* SRS 1111 100x x1x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* RFE 1111 100x x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
/* Coprocessor instructions... */
|
|
/* MCRR2 1111 1100 0100 xxxx xxxx xxxx xxxx xxxx */
|
|
/* MRRC2 1111 1100 0101 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDC2 1111 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC2 1111 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* CDP2 1111 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
/* MCR2 1111 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC2 1111 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
|
|
/* Other unallocated instructions... */
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_0001_0xx0____0xxx_table[] = {
|
|
/* Miscellaneous instructions */
|
|
|
|
/* MRS cpsr cccc 0001 0000 xxxx xxxx xxxx 0000 xxxx */
|
|
DECODE_SIMULATEX(0x0ff000f0, 0x01000000, simulate_mrs,
|
|
REGS(0, NOPC, 0, 0, 0)),
|
|
|
|
/* BX cccc 0001 0010 xxxx xxxx xxxx 0001 xxxx */
|
|
DECODE_SIMULATE (0x0ff000f0, 0x01200010, simulate_blx2bx),
|
|
|
|
/* BLX (register) cccc 0001 0010 xxxx xxxx xxxx 0011 xxxx */
|
|
DECODE_SIMULATEX(0x0ff000f0, 0x01200030, simulate_blx2bx,
|
|
REGS(0, 0, 0, 0, NOPC)),
|
|
|
|
/* CLZ cccc 0001 0110 xxxx xxxx xxxx 0001 xxxx */
|
|
DECODE_CUSTOM (0x0ff000f0, 0x01600010, prep_emulate_rd12rm0),
|
|
|
|
/* QADD cccc 0001 0000 xxxx xxxx xxxx 0101 xxxx */
|
|
/* QSUB cccc 0001 0010 xxxx xxxx xxxx 0101 xxxx */
|
|
/* QDADD cccc 0001 0100 xxxx xxxx xxxx 0101 xxxx */
|
|
/* QDSUB cccc 0001 0110 xxxx xxxx xxxx 0101 xxxx */
|
|
DECODE_CUSTOM (0x0f9000f0, 0x01000050, prep_emulate_rd12rn16rm0_wflags),
|
|
|
|
/* BXJ cccc 0001 0010 xxxx xxxx xxxx 0010 xxxx */
|
|
/* MSR cccc 0001 0x10 xxxx xxxx xxxx 0000 xxxx */
|
|
/* MRS spsr cccc 0001 0100 xxxx xxxx xxxx 0000 xxxx */
|
|
/* BKPT 1110 0001 0010 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SMC cccc 0001 0110 xxxx xxxx xxxx 0111 xxxx */
|
|
/* And unallocated instructions... */
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_0001_0xx0____1xx0_table[] = {
|
|
/* Halfword multiply and multiply-accumulate */
|
|
|
|
/* SMLALxy cccc 0001 0100 xxxx xxxx xxxx 1xx0 xxxx */
|
|
DECODE_CUSTOM (0x0ff00090, 0x01400080, prep_emulate_rdhi16rdlo12rs8rm0_wflags),
|
|
|
|
/* SMULWy cccc 0001 0010 xxxx xxxx xxxx 1x10 xxxx */
|
|
DECODE_OR (0x0ff000b0, 0x012000a0),
|
|
/* SMULxy cccc 0001 0110 xxxx xxxx xxxx 1xx0 xxxx */
|
|
DECODE_CUSTOM (0x0ff00090, 0x01600080, prep_emulate_rd16rs8rm0_wflags),
|
|
|
|
/* SMLAxy cccc 0001 0000 xxxx xxxx xxxx 1xx0 xxxx */
|
|
DECODE_OR (0x0ff00090, 0x01000080),
|
|
/* SMLAWy cccc 0001 0010 xxxx xxxx xxxx 1x00 xxxx */
|
|
DECODE_CUSTOM (0x0ff000b0, 0x01200080, prep_emulate_rd16rn12rs8rm0_wflags),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_0000_____1001_table[] = {
|
|
/* Multiply and multiply-accumulate */
|
|
|
|
/* MUL cccc 0000 0000 xxxx xxxx xxxx 1001 xxxx */
|
|
/* MULS cccc 0000 0001 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_CUSTOM (0x0fe000f0, 0x00000090, prep_emulate_rd16rs8rm0_wflags),
|
|
|
|
/* MLA cccc 0000 0010 xxxx xxxx xxxx 1001 xxxx */
|
|
/* MLAS cccc 0000 0011 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_OR (0x0fe000f0, 0x00200090),
|
|
/* MLS cccc 0000 0110 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_CUSTOM (0x0ff000f0, 0x00600090, prep_emulate_rd16rn12rs8rm0_wflags),
|
|
|
|
/* UMAAL cccc 0000 0100 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_OR (0x0ff000f0, 0x00400090),
|
|
/* UMULL cccc 0000 1000 xxxx xxxx xxxx 1001 xxxx */
|
|
/* UMULLS cccc 0000 1001 xxxx xxxx xxxx 1001 xxxx */
|
|
/* UMLAL cccc 0000 1010 xxxx xxxx xxxx 1001 xxxx */
|
|
/* UMLALS cccc 0000 1011 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SMULL cccc 0000 1100 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SMULLS cccc 0000 1101 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SMLAL cccc 0000 1110 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SMLALS cccc 0000 1111 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_CUSTOM (0x0f8000f0, 0x00800090, prep_emulate_rdhi16rdlo12rs8rm0_wflags),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_0001_____1001_table[] = {
|
|
/* Synchronization primitives */
|
|
|
|
/* SMP/SWPB cccc 0001 0x00 xxxx xxxx xxxx 1001 xxxx */
|
|
DECODE_CUSTOM (0x0fb000f0, 0x01000090, prep_emulate_rd12rn16rm0_wflags),
|
|
|
|
/* LDREX/STREX{,D,B,H} cccc 0001 1xxx xxxx xxxx xxxx 1001 xxxx */
|
|
/* And unallocated instructions... */
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_000x_____1xx1_table[] = {
|
|
/* Extra load/store instructions */
|
|
|
|
/* LDRD/STRD lr,pc,{... cccc 000x x0x0 xxxx 111x xxxx 1101 xxxx */
|
|
DECODE_REJECT (0x0e10e0d0, 0x0000e0d0),
|
|
|
|
/* LDRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1101 xxxx */
|
|
/* STRD (register) cccc 000x x0x0 xxxx xxxx xxxx 1111 xxxx */
|
|
DECODE_EMULATEX (0x0e5000d0, 0x000000d0, emulate_ldrdstrd,
|
|
REGS(NOPCWB, NOPCX, 0, 0, NOPC)),
|
|
|
|
/* LDRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1101 xxxx */
|
|
/* STRD (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1111 xxxx */
|
|
DECODE_EMULATEX (0x0e5000d0, 0x004000d0, emulate_ldrdstrd,
|
|
REGS(NOPCWB, NOPCX, 0, 0, 0)),
|
|
|
|
/* Reject Rd is PC */
|
|
/* TODO: fold this into next entry when it is made a DECODE_EMULATE */
|
|
DECODE_REJECT (0x0000f000, 0x0000f000),
|
|
|
|
/* STRH (register) cccc 000x x0x0 xxxx xxxx xxxx 1011 xxxx */
|
|
/* LDRH (register) cccc 000x x0x1 xxxx xxxx xxxx 1011 xxxx */
|
|
/* LDRSB (register) cccc 000x x0x1 xxxx xxxx xxxx 1101 xxxx */
|
|
/* LDRSH (register) cccc 000x x0x1 xxxx xxxx xxxx 1111 xxxx */
|
|
/* STRH (immediate) cccc 000x x1x0 xxxx xxxx xxxx 1011 xxxx */
|
|
/* LDRH (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1011 xxxx */
|
|
/* LDRSB (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1101 xxxx */
|
|
/* LDRSH (immediate) cccc 000x x1x1 xxxx xxxx xxxx 1111 xxxx */
|
|
DECODE_CUSTOM (0x0e000090, 0x00000090, prep_emulate_ldr_str),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_000x_table[] = {
|
|
/* Data-processing (register) */
|
|
|
|
/* <op>S PC, ... cccc 000x xxx1 xxxx 1111 xxxx xxxx xxxx */
|
|
DECODE_REJECT (0x0e10f000, 0x0010f000),
|
|
|
|
/* MOV IP, SP 1110 0001 1010 0000 1100 0000 0000 1101 */
|
|
DECODE_SIMULATE (0xffffffff, 0xe1a0c00d, simulate_mov_ipsp),
|
|
|
|
/* TST (register) cccc 0001 0001 xxxx xxxx xxxx xxx0 xxxx */
|
|
/* TEQ (register) cccc 0001 0011 xxxx xxxx xxxx xxx0 xxxx */
|
|
/* CMP (register) cccc 0001 0101 xxxx xxxx xxxx xxx0 xxxx */
|
|
/* CMN (register) cccc 0001 0111 xxxx xxxx xxxx xxx0 xxxx */
|
|
DECODE_EMULATEX (0x0f900010, 0x01100000, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(ANY, 0, 0, 0, ANY)),
|
|
|
|
/* MOV (register) cccc 0001 101x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* MVN (register) cccc 0001 111x xxxx xxxx xxxx xxx0 xxxx */
|
|
DECODE_EMULATEX (0x0fa00010, 0x01a00000, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(0, ANY, 0, 0, ANY)),
|
|
|
|
/* AND (register) cccc 0000 000x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* EOR (register) cccc 0000 001x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* SUB (register) cccc 0000 010x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* RSB (register) cccc 0000 011x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* ADD (register) cccc 0000 100x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* ADC (register) cccc 0000 101x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* SBC (register) cccc 0000 110x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* RSC (register) cccc 0000 111x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* ORR (register) cccc 0001 100x xxxx xxxx xxxx xxx0 xxxx */
|
|
/* BIC (register) cccc 0001 110x xxxx xxxx xxxx xxx0 xxxx */
|
|
DECODE_EMULATEX (0x0e000010, 0x00000000, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(ANY, ANY, 0, 0, ANY)),
|
|
|
|
/* TST (reg-shift reg) cccc 0001 0001 xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* TEQ (reg-shift reg) cccc 0001 0011 xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* CMP (reg-shift reg) cccc 0001 0101 xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* CMN (reg-shift reg) cccc 0001 0111 xxxx xxxx xxxx 0xx1 xxxx */
|
|
DECODE_EMULATEX (0x0f900090, 0x01100010, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(ANY, 0, NOPC, 0, ANY)),
|
|
|
|
/* MOV (reg-shift reg) cccc 0001 101x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* MVN (reg-shift reg) cccc 0001 111x xxxx xxxx xxxx 0xx1 xxxx */
|
|
DECODE_EMULATEX (0x0fa00090, 0x01a00010, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(0, ANY, NOPC, 0, ANY)),
|
|
|
|
/* AND (reg-shift reg) cccc 0000 000x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* EOR (reg-shift reg) cccc 0000 001x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* SUB (reg-shift reg) cccc 0000 010x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* RSB (reg-shift reg) cccc 0000 011x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* ADD (reg-shift reg) cccc 0000 100x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* ADC (reg-shift reg) cccc 0000 101x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* SBC (reg-shift reg) cccc 0000 110x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* RSC (reg-shift reg) cccc 0000 111x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* ORR (reg-shift reg) cccc 0001 100x xxxx xxxx xxxx 0xx1 xxxx */
|
|
/* BIC (reg-shift reg) cccc 0001 110x xxxx xxxx xxxx 0xx1 xxxx */
|
|
DECODE_EMULATEX (0x0e000090, 0x00000010, emulate_rd12rn16rm0rs8_rwflags,
|
|
REGS(ANY, ANY, NOPC, 0, ANY)),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_000x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
if ((insn & 0x0f900080) == 0x01000000)
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_0001_0xx0____0xxx_table, false);
|
|
|
|
if ((insn & 0x0f900090) == 0x01000080)
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_0001_0xx0____1xx0_table, false);
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|
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if ((insn & 0x0f0000f0) == 0x00000090)
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_0000_____1001_table, false);
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|
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if ((insn & 0x0f0000f0) == 0x01000090)
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|
return kprobe_decode_insn(insn, asi, arm_cccc_0001_____1001_table, false);
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|
|
|
if ((insn & 0x0e000090) == 0x00000090)
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_000x_____1xx1_table, false);
|
|
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return kprobe_decode_insn(insn, asi, arm_cccc_000x_table, false);
|
|
}
|
|
|
|
static const union decode_item arm_cccc_001x_table[] = {
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|
/* Data-processing (immediate) */
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|
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/* MOVW cccc 0011 0000 xxxx xxxx xxxx xxxx xxxx */
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/* MOVT cccc 0011 0100 xxxx xxxx xxxx xxxx xxxx */
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DECODE_CUSTOM (0x0fb00000, 0x03000000, prep_emulate_rd12_modify),
|
|
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/* YIELD cccc 0011 0010 0000 xxxx xxxx 0000 0001 */
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DECODE_OR (0x0fff00ff, 0x03200001),
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|
/* SEV cccc 0011 0010 0000 xxxx xxxx 0000 0100 */
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DECODE_EMULATE (0x0fff00ff, 0x03200004, kprobe_emulate_none),
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/* NOP cccc 0011 0010 0000 xxxx xxxx 0000 0000 */
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|
/* WFE cccc 0011 0010 0000 xxxx xxxx 0000 0010 */
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/* WFI cccc 0011 0010 0000 xxxx xxxx 0000 0011 */
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DECODE_SIMULATE (0x0fff00fc, 0x03200000, kprobe_simulate_nop),
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/* DBG cccc 0011 0010 0000 xxxx xxxx ffff xxxx */
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/* unallocated hints cccc 0011 0010 0000 xxxx xxxx xxxx xxxx */
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/* MSR (immediate) cccc 0011 0x10 xxxx xxxx xxxx xxxx xxxx */
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DECODE_REJECT (0x0fb00000, 0x03200000),
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|
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/* <op>S PC, ... cccc 001x xxx1 xxxx 1111 xxxx xxxx xxxx */
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DECODE_REJECT (0x0e10f000, 0x0210f000),
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|
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/* TST (immediate) cccc 0011 0001 xxxx xxxx xxxx xxxx xxxx */
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/* TEQ (immediate) cccc 0011 0011 xxxx xxxx xxxx xxxx xxxx */
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/* CMP (immediate) cccc 0011 0101 xxxx xxxx xxxx xxxx xxxx */
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/* CMN (immediate) cccc 0011 0111 xxxx xxxx xxxx xxxx xxxx */
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DECODE_EMULATEX (0x0f900000, 0x03100000, emulate_rd12rn16rm0rs8_rwflags,
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REGS(ANY, 0, 0, 0, 0)),
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|
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/* MOV (immediate) cccc 0011 101x xxxx xxxx xxxx xxxx xxxx */
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/* MVN (immediate) cccc 0011 111x xxxx xxxx xxxx xxxx xxxx */
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DECODE_EMULATEX (0x0fa00000, 0x03a00000, emulate_rd12rn16rm0rs8_rwflags,
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REGS(0, ANY, 0, 0, 0)),
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|
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/* AND (immediate) cccc 0010 000x xxxx xxxx xxxx xxxx xxxx */
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/* EOR (immediate) cccc 0010 001x xxxx xxxx xxxx xxxx xxxx */
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/* SUB (immediate) cccc 0010 010x xxxx xxxx xxxx xxxx xxxx */
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/* RSB (immediate) cccc 0010 011x xxxx xxxx xxxx xxxx xxxx */
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/* ADD (immediate) cccc 0010 100x xxxx xxxx xxxx xxxx xxxx */
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|
/* ADC (immediate) cccc 0010 101x xxxx xxxx xxxx xxxx xxxx */
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/* SBC (immediate) cccc 0010 110x xxxx xxxx xxxx xxxx xxxx */
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|
/* RSC (immediate) cccc 0010 111x xxxx xxxx xxxx xxxx xxxx */
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|
/* ORR (immediate) cccc 0011 100x xxxx xxxx xxxx xxxx xxxx */
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|
/* BIC (immediate) cccc 0011 110x xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_EMULATEX (0x0e000000, 0x02000000, emulate_rd12rn16rm0rs8_rwflags,
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REGS(ANY, ANY, 0, 0, 0)),
|
|
|
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DECODE_END
|
|
};
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|
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static const union decode_item arm_cccc_0110_____xxx1_table[] = {
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|
/* Media instructions */
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|
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|
/* SEL cccc 0110 1000 xxxx xxxx xxxx 1011 xxxx */
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|
DECODE_EMULATEX (0x0ff000f0, 0x068000b0, emulate_rd12rn16rm0_rwflags_nopc,
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|
REGS(NOPC, NOPC, 0, 0, NOPC)),
|
|
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|
/* SSAT cccc 0110 101x xxxx xxxx xxxx xx01 xxxx */
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|
/* USAT cccc 0110 111x xxxx xxxx xxxx xx01 xxxx */
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|
DECODE_OR(0x0fa00030, 0x06a00010),
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|
/* SSAT16 cccc 0110 1010 xxxx xxxx xxxx 0011 xxxx */
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|
/* USAT16 cccc 0110 1110 xxxx xxxx xxxx 0011 xxxx */
|
|
DECODE_EMULATEX (0x0fb000f0, 0x06a00030, emulate_rd12rn16rm0_rwflags_nopc,
|
|
REGS(0, NOPC, 0, 0, NOPC)),
|
|
|
|
/* REV cccc 0110 1011 xxxx xxxx xxxx 0011 xxxx */
|
|
/* REV16 cccc 0110 1011 xxxx xxxx xxxx 1011 xxxx */
|
|
/* RBIT cccc 0110 1111 xxxx xxxx xxxx 0011 xxxx */
|
|
/* REVSH cccc 0110 1111 xxxx xxxx xxxx 1011 xxxx */
|
|
DECODE_CUSTOM (0x0fb00070, 0x06b00030, prep_emulate_rd12rm0),
|
|
|
|
/* ??? cccc 0110 0x00 xxxx xxxx xxxx xxx1 xxxx */
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|
DECODE_REJECT (0x0fb00010, 0x06000010),
|
|
/* ??? cccc 0110 0xxx xxxx xxxx xxxx 1011 xxxx */
|
|
DECODE_REJECT (0x0f8000f0, 0x060000b0),
|
|
/* ??? cccc 0110 0xxx xxxx xxxx xxxx 1101 xxxx */
|
|
DECODE_REJECT (0x0f8000f0, 0x060000d0),
|
|
/* SADD16 cccc 0110 0001 xxxx xxxx xxxx 0001 xxxx */
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|
/* SADDSUBX cccc 0110 0001 xxxx xxxx xxxx 0011 xxxx */
|
|
/* SSUBADDX cccc 0110 0001 xxxx xxxx xxxx 0101 xxxx */
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/* SSUB16 cccc 0110 0001 xxxx xxxx xxxx 0111 xxxx */
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/* SADD8 cccc 0110 0001 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SSUB8 cccc 0110 0001 xxxx xxxx xxxx 1111 xxxx */
|
|
/* QADD16 cccc 0110 0010 xxxx xxxx xxxx 0001 xxxx */
|
|
/* QADDSUBX cccc 0110 0010 xxxx xxxx xxxx 0011 xxxx */
|
|
/* QSUBADDX cccc 0110 0010 xxxx xxxx xxxx 0101 xxxx */
|
|
/* QSUB16 cccc 0110 0010 xxxx xxxx xxxx 0111 xxxx */
|
|
/* QADD8 cccc 0110 0010 xxxx xxxx xxxx 1001 xxxx */
|
|
/* QSUB8 cccc 0110 0010 xxxx xxxx xxxx 1111 xxxx */
|
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/* SHADD16 cccc 0110 0011 xxxx xxxx xxxx 0001 xxxx */
|
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/* SHADDSUBX cccc 0110 0011 xxxx xxxx xxxx 0011 xxxx */
|
|
/* SHSUBADDX cccc 0110 0011 xxxx xxxx xxxx 0101 xxxx */
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|
/* SHSUB16 cccc 0110 0011 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SHADD8 cccc 0110 0011 xxxx xxxx xxxx 1001 xxxx */
|
|
/* SHSUB8 cccc 0110 0011 xxxx xxxx xxxx 1111 xxxx */
|
|
/* UADD16 cccc 0110 0101 xxxx xxxx xxxx 0001 xxxx */
|
|
/* UADDSUBX cccc 0110 0101 xxxx xxxx xxxx 0011 xxxx */
|
|
/* USUBADDX cccc 0110 0101 xxxx xxxx xxxx 0101 xxxx */
|
|
/* USUB16 cccc 0110 0101 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UADD8 cccc 0110 0101 xxxx xxxx xxxx 1001 xxxx */
|
|
/* USUB8 cccc 0110 0101 xxxx xxxx xxxx 1111 xxxx */
|
|
/* UQADD16 cccc 0110 0110 xxxx xxxx xxxx 0001 xxxx */
|
|
/* UQADDSUBX cccc 0110 0110 xxxx xxxx xxxx 0011 xxxx */
|
|
/* UQSUBADDX cccc 0110 0110 xxxx xxxx xxxx 0101 xxxx */
|
|
/* UQSUB16 cccc 0110 0110 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UQADD8 cccc 0110 0110 xxxx xxxx xxxx 1001 xxxx */
|
|
/* UQSUB8 cccc 0110 0110 xxxx xxxx xxxx 1111 xxxx */
|
|
/* UHADD16 cccc 0110 0111 xxxx xxxx xxxx 0001 xxxx */
|
|
/* UHADDSUBX cccc 0110 0111 xxxx xxxx xxxx 0011 xxxx */
|
|
/* UHSUBADDX cccc 0110 0111 xxxx xxxx xxxx 0101 xxxx */
|
|
/* UHSUB16 cccc 0110 0111 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UHADD8 cccc 0110 0111 xxxx xxxx xxxx 1001 xxxx */
|
|
/* UHSUB8 cccc 0110 0111 xxxx xxxx xxxx 1111 xxxx */
|
|
DECODE_CUSTOM (0x0f800010, 0x06000010, prep_emulate_rd12rn16rm0_wflags),
|
|
|
|
/* PKHBT cccc 0110 1000 xxxx xxxx xxxx x001 xxxx */
|
|
/* PKHTB cccc 0110 1000 xxxx xxxx xxxx x101 xxxx */
|
|
DECODE_CUSTOM (0x0ff00030, 0x06800010, prep_emulate_rd12rn16rm0_wflags),
|
|
|
|
/* ??? cccc 0110 1001 xxxx xxxx xxxx 0111 xxxx */
|
|
/* ??? cccc 0110 1101 xxxx xxxx xxxx 0111 xxxx */
|
|
DECODE_REJECT (0x0fb000f0, 0x06900070),
|
|
|
|
/* SXTB16 cccc 0110 1000 1111 xxxx xxxx 0111 xxxx */
|
|
/* SXTB cccc 0110 1010 1111 xxxx xxxx 0111 xxxx */
|
|
/* SXTH cccc 0110 1011 1111 xxxx xxxx 0111 xxxx */
|
|
/* UXTB16 cccc 0110 1100 1111 xxxx xxxx 0111 xxxx */
|
|
/* UXTB cccc 0110 1110 1111 xxxx xxxx 0111 xxxx */
|
|
/* UXTH cccc 0110 1111 1111 xxxx xxxx 0111 xxxx */
|
|
DECODE_CUSTOM (0x0f8f00f0, 0x068f0070, prep_emulate_rd12rm0),
|
|
|
|
/* SXTAB16 cccc 0110 1000 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SXTAB cccc 0110 1010 xxxx xxxx xxxx 0111 xxxx */
|
|
/* SXTAH cccc 0110 1011 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UXTAB16 cccc 0110 1100 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UXTAB cccc 0110 1110 xxxx xxxx xxxx 0111 xxxx */
|
|
/* UXTAH cccc 0110 1111 xxxx xxxx xxxx 0111 xxxx */
|
|
DECODE_CUSTOM (0x0f8000f0, 0x06800070, prep_emulate_rd12rn16rm0_wflags),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_0111_____xxx1_table[] = {
|
|
/* Media instructions */
|
|
|
|
/* UNDEFINED cccc 0111 1111 xxxx xxxx xxxx 1111 xxxx */
|
|
DECODE_REJECT (0x0ff000f0, 0x07f000f0),
|
|
|
|
/* SMLALD cccc 0111 0100 xxxx xxxx xxxx 00x1 xxxx */
|
|
/* SMLSLD cccc 0111 0100 xxxx xxxx xxxx 01x1 xxxx */
|
|
DECODE_CUSTOM (0x0ff00090, 0x07400010, prep_emulate_rdhi16rdlo12rs8rm0_wflags),
|
|
|
|
/* SMUAD cccc 0111 0000 xxxx 1111 xxxx 00x1 xxxx */
|
|
/* SMUSD cccc 0111 0000 xxxx 1111 xxxx 01x1 xxxx */
|
|
DECODE_OR (0x0ff0f090, 0x0700f010),
|
|
/* SMMUL cccc 0111 0101 xxxx 1111 xxxx 00x1 xxxx */
|
|
DECODE_OR (0x0ff0f0d0, 0x0750f010),
|
|
/* USAD8 cccc 0111 1000 xxxx 1111 xxxx 0001 xxxx */
|
|
DECODE_CUSTOM (0x0ff0f0f0, 0x0780f010, prep_emulate_rd16rs8rm0_wflags),
|
|
|
|
/* SMLAD cccc 0111 0000 xxxx xxxx xxxx 00x1 xxxx */
|
|
/* SMLSD cccc 0111 0000 xxxx xxxx xxxx 01x1 xxxx */
|
|
DECODE_OR (0x0ff00090, 0x07000010),
|
|
/* SMMLA cccc 0111 0101 xxxx xxxx xxxx 00x1 xxxx */
|
|
DECODE_OR (0x0ff000d0, 0x07500010),
|
|
/* USADA8 cccc 0111 1000 xxxx xxxx xxxx 0001 xxxx */
|
|
DECODE_CUSTOM (0x0ff000f0, 0x07800010, prep_emulate_rd16rn12rs8rm0_wflags),
|
|
|
|
/* SMMLS cccc 0111 0101 xxxx xxxx xxxx 11x1 xxxx */
|
|
DECODE_CUSTOM (0x0ff000d0, 0x075000d0, prep_emulate_rd16rn12rs8rm0_wflags),
|
|
|
|
/* SBFX cccc 0111 101x xxxx xxxx xxxx x101 xxxx */
|
|
/* UBFX cccc 0111 111x xxxx xxxx xxxx x101 xxxx */
|
|
DECODE_CUSTOM (0x0fa00070, 0x07a00050, prep_emulate_rd12rm0),
|
|
|
|
/* BFC cccc 0111 110x xxxx xxxx xxxx x001 1111 */
|
|
DECODE_CUSTOM (0x0fe0007f, 0x07c0001f, prep_emulate_rd12_modify),
|
|
|
|
/* BFI cccc 0111 110x xxxx xxxx xxxx x001 xxxx */
|
|
DECODE_CUSTOM (0x0fe00070, 0x07c00010, prep_emulate_rd12rn0_modify),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_01xx_table[] = {
|
|
/* Load/store word and unsigned byte */
|
|
|
|
/* LDRB/STRB pc,[...] cccc 01xx x0xx xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_REJECT (0x0c40f000, 0x0440f000),
|
|
|
|
/* LDR cccc 01xx x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRB cccc 01xx x1x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRBT cccc 01x0 x111 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDRT cccc 01x0 x011 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STR cccc 01xx x0x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRB cccc 01xx x1x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRBT cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STRT cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_CUSTOM (0x0c000000, 0x04000000, prep_emulate_ldr_str),
|
|
|
|
DECODE_END
|
|
};
|
|
|
|
static const union decode_item arm_cccc_100x_table[] = {
|
|
/* Block data transfer instructions */
|
|
|
|
/* LDM cccc 100x x0x1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STM cccc 100x x0x0 xxxx xxxx xxxx xxxx xxxx */
|
|
DECODE_CUSTOM (0x0e400000, 0x08000000, kprobe_decode_ldmstm),
|
|
|
|
/* STM (user registers) cccc 100x x1x0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* LDM (user registers) cccc 100x x1x1 xxxx 0xxx xxxx xxxx xxxx */
|
|
/* LDM (exception ret) cccc 100x x1x1 xxxx 1xxx xxxx xxxx xxxx */
|
|
DECODE_END
|
|
};
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_101x(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* B : cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
/* BL : cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
asi->insn_handler = simulate_bbl;
|
|
return INSN_GOOD_NO_SLOT;
|
|
}
|
|
|
|
static enum kprobe_insn __kprobes
|
|
space_cccc_11xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
/* Coprocessor instructions... */
|
|
/* MCRR : cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
/* MRRC : cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */
|
|
/* LDC : cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */
|
|
/* STC : cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */
|
|
/* CDP : cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */
|
|
/* MCR : cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */
|
|
/* MRC : cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */
|
|
|
|
/* SVC : cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */
|
|
|
|
return INSN_REJECTED;
|
|
}
|
|
|
|
static void __kprobes arm_singlestep(struct kprobe *p, struct pt_regs *regs)
|
|
{
|
|
regs->ARM_pc += 4;
|
|
p->ainsn.insn_handler(p, regs);
|
|
}
|
|
|
|
/* Return:
|
|
* INSN_REJECTED If instruction is one not allowed to kprobe,
|
|
* INSN_GOOD If instruction is supported and uses instruction slot,
|
|
* INSN_GOOD_NO_SLOT If instruction is supported but doesn't use its slot.
|
|
*
|
|
* For instructions we don't want to kprobe (INSN_REJECTED return result):
|
|
* These are generally ones that modify the processor state making
|
|
* them "hard" to simulate such as switches processor modes or
|
|
* make accesses in alternate modes. Any of these could be simulated
|
|
* if the work was put into it, but low return considering they
|
|
* should also be very rare.
|
|
*/
|
|
enum kprobe_insn __kprobes
|
|
arm_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)
|
|
{
|
|
asi->insn_singlestep = arm_singlestep;
|
|
asi->insn_check_cc = kprobe_condition_checks[insn>>28];
|
|
asi->insn[1] = KPROBE_RETURN_INSTRUCTION;
|
|
|
|
if ((insn & 0xf0000000) == 0xf0000000)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_1111_table, false);
|
|
|
|
else if ((insn & 0x0e000000) == 0x00000000)
|
|
|
|
return space_cccc_000x(insn, asi);
|
|
|
|
else if ((insn & 0x0e000000) == 0x02000000)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_001x_table, false);
|
|
|
|
else if ((insn & 0x0f000010) == 0x06000010)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_0110_____xxx1_table, false);
|
|
|
|
else if ((insn & 0x0f000010) == 0x07000010)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_0111_____xxx1_table, false);
|
|
|
|
else if ((insn & 0x0c000000) == 0x04000000)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_01xx_table, false);
|
|
|
|
else if ((insn & 0x0e000000) == 0x08000000)
|
|
|
|
return kprobe_decode_insn(insn, asi, arm_cccc_100x_table, false);
|
|
|
|
else if ((insn & 0x0e000000) == 0x0a000000)
|
|
|
|
return space_cccc_101x(insn, asi);
|
|
|
|
return space_cccc_11xx(insn, asi);
|
|
}
|