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#ifndef __ASM_OPENRISC_PTRACE_H
  19#define __ASM_OPENRISC_PTRACE_H
  20
  21
  22#include <asm/spr_defs.h>
  23#include <uapi/asm/ptrace.h>
  24
  25/*
  26 * Make kernel PTrace/register structures opaque to userspace... userspace can
  27 * access thread state via the regset mechanism.  This allows us a bit of
  28 * flexibility in how we order the registers on the stack, permitting some
  29 * optimizations like packing call-clobbered registers together so that
  30 * they share a cacheline (not done yet, though... future optimization).
  31 */
  32
  33#ifndef __ASSEMBLY__
  34/*
  35 * This struct describes how the registers are laid out on the kernel stack
  36 * during a syscall or other kernel entry.
  37 *
  38 * This structure should always be cacheline aligned on the stack.
  39 * FIXME: I don't think that's the case right now.  The alignment is
  40 * taken care of elsewhere... head.S, process.c, etc.
  41 */
  42
  43struct pt_regs {
  44        union {
  45                struct {
  46                        /* Named registers */
  47                        long  sr;       /* Stored in place of r0 */
  48                        long  sp;       /* r1 */
  49                };
  50                struct {
  51                        /* Old style */
  52                        long offset[2];
  53                        long gprs[30];
  54                };
  55                struct {
  56                        /* New style */
  57                        long gpr[32];
  58                };
  59        };
  60        long  pc;
  61        /* For restarting system calls:
  62         * Set to syscall number for syscall exceptions,
  63         * -1 for all other exceptions.
  64         */
  65        long  orig_gpr11;       /* For restarting system calls */
  66        long dummy;             /* Cheap alignment fix */
  67        long dummy2;            /* Cheap alignment fix */
  68};
  69
  70/* TODO: Rename this to REDZONE because that's what it is */
  71#define STACK_FRAME_OVERHEAD  128  /* size of minimum stack frame */
  72
  73#define instruction_pointer(regs)       ((regs)->pc)
  74#define user_mode(regs)                 (((regs)->sr & SPR_SR_SM) == 0)
  75#define user_stack_pointer(regs)        ((unsigned long)(regs)->sp)
  76#define profile_pc(regs)                instruction_pointer(regs)
  77
  78static inline long regs_return_value(struct pt_regs *regs)
  79{
  80        return regs->gpr[11];
  81}
  82
  83#endif /* __ASSEMBLY__ */
  84
  85/*
  86 * Offsets used by 'ptrace' system call interface.
  87 */
  88#define PT_SR         0
  89#define PT_SP         4
  90#define PT_GPR2       8
  91#define PT_GPR3       12
  92#define PT_GPR4       16
  93#define PT_GPR5       20
  94#define PT_GPR6       24
  95#define PT_GPR7       28
  96#define PT_GPR8       32
  97#define PT_GPR9       36
  98#define PT_GPR10      40
  99#define PT_GPR11      44
 100#define PT_GPR12      48
 101#define PT_GPR13      52
 102#define PT_GPR14      56
 103#define PT_GPR15      60
 104#define PT_GPR16      64
 105#define PT_GPR17      68
 106#define PT_GPR18      72
 107#define PT_GPR19      76
 108#define PT_GPR20      80
 109#define PT_GPR21      84
 110#define PT_GPR22      88
 111#define PT_GPR23      92
 112#define PT_GPR24      96
 113#define PT_GPR25      100
 114#define PT_GPR26      104
 115#define PT_GPR27      108
 116#define PT_GPR28      112
 117#define PT_GPR29      116
 118#define PT_GPR30      120
 119#define PT_GPR31      124
 120#define PT_PC         128
 121#define PT_ORIG_GPR11 132
 122#define PT_SYSCALLNO  136
 123
 124#endif /* __ASM_OPENRISC_PTRACE_H */
 125