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linux/arch/c6x/include/asm/ptrace.h
Mark Salter fce2447627 C6X: add support to build with BINFMT_ELF_FDPIC 
C6x userspace supports a shared library mechanism called DSBT for systems with
no MMU. DSBT is similar to FDPIC in allowing shared text segments and private
copies of data segments without an MMU. Both methods access data using a base
register and offset. With FDPIC, the caller of an external function sets up the
base register for the callee. With DSBT, the called function sets up its own
base register. Other details differ but both userspaces need the same thing
from the kernel loader: a map of where each ELF segment was loaded. The FDPIC
loader already provides this, so DSBT just uses it.

This patch enables BINFMT_ELF_FDPIC by default for C6X and provides the
necessary architecture hooks for the generic loader.

Signed-off-by: Mark Salter <msalter@redhat.com>
2012-05-15 09:17:34 -04:00

180 lines
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/*
* Copyright (C) 2004, 2006, 2009, 2010 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* Updated for 2.6.34: Mark Salter <msalter@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASM_C6X_PTRACE_H
#define _ASM_C6X_PTRACE_H
#define BKPT_OPCODE 0x56454314 /* illegal opcode */
#ifdef _BIG_ENDIAN
#define PT_LO(odd, even) odd
#define PT_HI(odd, even) even
#else
#define PT_LO(odd, even) even
#define PT_HI(odd, even) odd
#endif
#define PT_A4_ORG PT_LO(1, 0)
#define PT_TSR PT_HI(1, 0)
#define PT_ILC PT_LO(3, 2)
#define PT_RILC PT_HI(3, 2)
#define PT_CSR PT_LO(5, 4)
#define PT_PC PT_HI(5, 4)
#define PT_B16 PT_LO(7, 6)
#define PT_B17 PT_HI(7, 6)
#define PT_B18 PT_LO(9, 8)
#define PT_B19 PT_HI(9, 8)
#define PT_B20 PT_LO(11, 10)
#define PT_B21 PT_HI(11, 10)
#define PT_B22 PT_LO(13, 12)
#define PT_B23 PT_HI(13, 12)
#define PT_B24 PT_LO(15, 14)
#define PT_B25 PT_HI(15, 14)
#define PT_B26 PT_LO(17, 16)
#define PT_B27 PT_HI(17, 16)
#define PT_B28 PT_LO(19, 18)
#define PT_B29 PT_HI(19, 18)
#define PT_B30 PT_LO(21, 20)
#define PT_B31 PT_HI(21, 20)
#define PT_B0 PT_LO(23, 22)
#define PT_B1 PT_HI(23, 22)
#define PT_B2 PT_LO(25, 24)
#define PT_B3 PT_HI(25, 24)
#define PT_B4 PT_LO(27, 26)
#define PT_B5 PT_HI(27, 26)
#define PT_B6 PT_LO(29, 28)
#define PT_B7 PT_HI(29, 28)
#define PT_B8 PT_LO(31, 30)
#define PT_B9 PT_HI(31, 30)
#define PT_B10 PT_LO(33, 32)
#define PT_B11 PT_HI(33, 32)
#define PT_B12 PT_LO(35, 34)
#define PT_B13 PT_HI(35, 34)
#define PT_A16 PT_LO(37, 36)
#define PT_A17 PT_HI(37, 36)
#define PT_A18 PT_LO(39, 38)
#define PT_A19 PT_HI(39, 38)
#define PT_A20 PT_LO(41, 40)
#define PT_A21 PT_HI(41, 40)
#define PT_A22 PT_LO(43, 42)
#define PT_A23 PT_HI(43, 42)
#define PT_A24 PT_LO(45, 44)
#define PT_A25 PT_HI(45, 44)
#define PT_A26 PT_LO(47, 46)
#define PT_A27 PT_HI(47, 46)
#define PT_A28 PT_LO(49, 48)
#define PT_A29 PT_HI(49, 48)
#define PT_A30 PT_LO(51, 50)
#define PT_A31 PT_HI(51, 50)
#define PT_A0 PT_LO(53, 52)
#define PT_A1 PT_HI(53, 52)
#define PT_A2 PT_LO(55, 54)
#define PT_A3 PT_HI(55, 54)
#define PT_A4 PT_LO(57, 56)
#define PT_A5 PT_HI(57, 56)
#define PT_A6 PT_LO(59, 58)
#define PT_A7 PT_HI(59, 58)
#define PT_A8 PT_LO(61, 60)
#define PT_A9 PT_HI(61, 60)
#define PT_A10 PT_LO(63, 62)
#define PT_A11 PT_HI(63, 62)
#define PT_A12 PT_LO(65, 64)
#define PT_A13 PT_HI(65, 64)
#define PT_A14 PT_LO(67, 66)
#define PT_A15 PT_HI(67, 66)
#define PT_B14 PT_LO(69, 68)
#define PT_B15 PT_HI(69, 68)
#define NR_PTREGS 70
#define PT_DP PT_B14 /* Data Segment Pointer (B14) */
#define PT_SP PT_B15 /* Stack Pointer (B15) */
#define PTRACE_GETFDPIC 31 /* get the ELF fdpic loadmap address */
#define PTRACE_GETFDPIC_EXEC 0 /* [addr] request the executable loadmap */
#define PTRACE_GETFDPIC_INTERP 1 /* [addr] request the interpreter loadmap */
#ifndef __ASSEMBLY__
#ifdef _BIG_ENDIAN
#define REG_PAIR(odd, even) unsigned long odd; unsigned long even
#else
#define REG_PAIR(odd, even) unsigned long even; unsigned long odd
#endif
/*
* this struct defines the way the registers are stored on the
* stack during a system call. fields defined with REG_PAIR
* are saved and restored using double-word memory operations
* which means the word ordering of the pair depends on endianess.
*/
struct pt_regs {
REG_PAIR(tsr, orig_a4);
REG_PAIR(rilc, ilc);
REG_PAIR(pc, csr);
REG_PAIR(b17, b16);
REG_PAIR(b19, b18);
REG_PAIR(b21, b20);
REG_PAIR(b23, b22);
REG_PAIR(b25, b24);
REG_PAIR(b27, b26);
REG_PAIR(b29, b28);
REG_PAIR(b31, b30);
REG_PAIR(b1, b0);
REG_PAIR(b3, b2);
REG_PAIR(b5, b4);
REG_PAIR(b7, b6);
REG_PAIR(b9, b8);
REG_PAIR(b11, b10);
REG_PAIR(b13, b12);
REG_PAIR(a17, a16);
REG_PAIR(a19, a18);
REG_PAIR(a21, a20);
REG_PAIR(a23, a22);
REG_PAIR(a25, a24);
REG_PAIR(a27, a26);
REG_PAIR(a29, a28);
REG_PAIR(a31, a30);
REG_PAIR(a1, a0);
REG_PAIR(a3, a2);
REG_PAIR(a5, a4);
REG_PAIR(a7, a6);
REG_PAIR(a9, a8);
REG_PAIR(a11, a10);
REG_PAIR(a13, a12);
REG_PAIR(a15, a14);
REG_PAIR(sp, dp);
};
#ifdef __KERNEL__
#include <linux/linkage.h>
#define user_mode(regs) ((((regs)->tsr) & 0x40) != 0)
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
#define user_stack_pointer(regs) ((regs)->sp)
extern void show_regs(struct pt_regs *);
extern asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs);
extern asmlinkage void syscall_trace_exit(struct pt_regs *regs);
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
#endif /* _ASM_C6X_PTRACE_H */
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