LXR linux/arch/openrisc/include/asm/ptrace.h

   1/*
   2 * OpenRISC Linux
   3 *
   4 * Linux architectural port borrowing liberally from similar works of
   5 * others.  All original copyrights apply as per the original source
   6 * declaration.
   7 *
   8 * OpenRISC implementation:
   9 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11 * et al.
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License as published by
  15 * the Free Software Foundation; either version 2 of the License, or
  16 * (at your option) any later version.
  17 */
  18
  19#ifndef __ASM_OPENRISC_PTRACE_H
  20#define __ASM_OPENRISC_PTRACE_H
  21
  22#include <asm/spr_defs.h>
  23
  24#ifndef __ASSEMBLY__
  25/*
  26 * This is the layout of the regset returned by the GETREGSET ptrace call
  27 */
  28struct user_regs_struct {
  29        /* GPR R0-R31... */
  30        unsigned long gpr[32];
  31        unsigned long pc;
  32        unsigned long sr;
  33        unsigned long pad1;
  34        unsigned long pad2;
  35};
  36#endif
  37
  38#ifdef __KERNEL__
  39
  40/*
  41 * Make kernel PTrace/register structures opaque to userspace... userspace can
  42 * access thread state via the regset mechanism.  This allows us a bit of
  43 * flexibility in how we order the registers on the stack, permitting some
  44 * optimizations like packing call-clobbered registers together so that
  45 * they share a cacheline (not done yet, though... future optimization).
  46 */
  47
  48#ifndef __ASSEMBLY__
  49/*
  50 * This struct describes how the registers are laid out on the kernel stack
  51 * during a syscall or other kernel entry.
  52 *
  53 * This structure should always be cacheline aligned on the stack.
  54 * FIXME: I don't think that's the case right now.  The alignment is
  55 * taken care of elsewhere... head.S, process.c, etc.
  56 */
  57
  58struct pt_regs {
  59        union {
  60                struct {
  61                        /* Named registers */
  62                        long  sr;       /* Stored in place of r0 */
  63                        long  sp;       /* r1 */
  64                };
  65                struct {
  66                        /* Old style */
  67                        long offset[2];
  68                        long gprs[30];
  69                };
  70                struct {
  71                        /* New style */
  72                        long gpr[32];
  73                };
  74        };
  75        long  pc;
  76        long  orig_gpr11;       /* For restarting system calls */
  77        long  syscallno;        /* Syscall number (used by strace) */
  78        long dummy;             /* Cheap alignment fix */
  79};
  80#endif /* __ASSEMBLY__ */
  81
  82/* TODO: Rename this to REDZONE because that's what it is */
  83#define STACK_FRAME_OVERHEAD  128  /* size of minimum stack frame */
  84
  85#define instruction_pointer(regs)       ((regs)->pc)
  86#define user_mode(regs)                 (((regs)->sr & SPR_SR_SM) == 0)
  87#define user_stack_pointer(regs)        ((unsigned long)(regs)->sp)
  88#define profile_pc(regs)                instruction_pointer(regs)
  89
  90/*
  91 * Offsets used by 'ptrace' system call interface.
  92 */
  93#define PT_SR         0
  94#define PT_SP         4
  95#define PT_GPR2       8
  96#define PT_GPR3       12
  97#define PT_GPR4       16
  98#define PT_GPR5       20
  99#define PT_GPR6       24
 100#define PT_GPR7       28
 101#define PT_GPR8       32
 102#define PT_GPR9       36
 103#define PT_GPR10      40
 104#define PT_GPR11      44
 105#define PT_GPR12      48
 106#define PT_GPR13      52
 107#define PT_GPR14      56
 108#define PT_GPR15      60
 109#define PT_GPR16      64
 110#define PT_GPR17      68
 111#define PT_GPR18      72
 112#define PT_GPR19      76
 113#define PT_GPR20      80
 114#define PT_GPR21      84
 115#define PT_GPR22      88
 116#define PT_GPR23      92
 117#define PT_GPR24      96
 118#define PT_GPR25      100
 119#define PT_GPR26      104
 120#define PT_GPR27      108
 121#define PT_GPR28      112
 122#define PT_GPR29      116
 123#define PT_GPR30      120
 124#define PT_GPR31      124
 125#define PT_PC         128
 126#define PT_ORIG_GPR11 132
 127#define PT_SYSCALLNO  136
 128
 129#endif /* __KERNEL__ */
 130
 131#endif /* __ASM_OPENRISC_PTRACE_H */
 132