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

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * OpenRISC Linux
   4 *
   5 * Linux architectural port borrowing liberally from similar works of
   6 * others.  All original copyrights apply as per the original source
   7 * declaration.
   8 *
   9 * OpenRISC implementation:
  10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  12 * et al.
  13 */
  14#ifndef __ASM_OPENRISC_PTRACE_H
  15#define __ASM_OPENRISC_PTRACE_H
  16
  17
  18#include <asm/spr_defs.h>
  19#include <uapi/asm/ptrace.h>
  20
  21/*
  22 * Make kernel PTrace/register structures opaque to userspace... userspace can
  23 * access thread state via the regset mechanism.  This allows us a bit of
  24 * flexibility in how we order the registers on the stack, permitting some
  25 * optimizations like packing call-clobbered registers together so that
  26 * they share a cacheline (not done yet, though... future optimization).
  27 */
  28
  29#ifndef __ASSEMBLY__
  30/*
  31 * This struct describes how the registers are laid out on the kernel stack
  32 * during a syscall or other kernel entry.
  33 *
  34 * This structure should always be cacheline aligned on the stack.
  35 * FIXME: I don't think that's the case right now.  The alignment is
  36 * taken care of elsewhere... head.S, process.c, etc.
  37 */
  38
  39struct pt_regs {
  40        union {
  41                struct {
  42                        /* Named registers */
  43                        long  sr;       /* Stored in place of r0 */
  44                        long  sp;       /* r1 */
  45                };
  46                struct {
  47                        /* Old style */
  48                        long offset[2];
  49                        long gprs[30];
  50                };
  51                struct {
  52                        /* New style */
  53                        long gpr[32];
  54                };
  55        };
  56        long  pc;
  57        /* For restarting system calls:
  58         * Set to syscall number for syscall exceptions,
  59         * -1 for all other exceptions.
  60         */
  61        long  orig_gpr11;       /* For restarting system calls */
  62        long dummy;             /* Cheap alignment fix */
  63        long dummy2;            /* Cheap alignment fix */
  64};
  65
  66/* TODO: Rename this to REDZONE because that's what it is */
  67#define STACK_FRAME_OVERHEAD  128  /* size of minimum stack frame */
  68
  69#define instruction_pointer(regs)       ((regs)->pc)
  70#define user_mode(regs)                 (((regs)->sr & SPR_SR_SM) == 0)
  71#define user_stack_pointer(regs)        ((unsigned long)(regs)->sp)
  72#define profile_pc(regs)                instruction_pointer(regs)
  73
  74static inline long regs_return_value(struct pt_regs *regs)
  75{
  76        return regs->gpr[11];
  77}
  78
  79#endif /* __ASSEMBLY__ */
  80
  81/*
  82 * Offsets used by 'ptrace' system call interface.
  83 */
  84#define PT_SR         0
  85#define PT_SP         4
  86#define PT_GPR2       8
  87#define PT_GPR3       12
  88#define PT_GPR4       16
  89#define PT_GPR5       20
  90#define PT_GPR6       24
  91#define PT_GPR7       28
  92#define PT_GPR8       32
  93#define PT_GPR9       36
  94#define PT_GPR10      40
  95#define PT_GPR11      44
  96#define PT_GPR12      48
  97#define PT_GPR13      52
  98#define PT_GPR14      56
  99#define PT_GPR15      60
 100#define PT_GPR16      64
 101#define PT_GPR17      68
 102#define PT_GPR18      72
 103#define PT_GPR19      76
 104#define PT_GPR20      80
 105#define PT_GPR21      84
 106#define PT_GPR22      88
 107#define PT_GPR23      92
 108#define PT_GPR24      96
 109#define PT_GPR25      100
 110#define PT_GPR26      104
 111#define PT_GPR27      108
 112#define PT_GPR28      112
 113#define PT_GPR29      116
 114#define PT_GPR30      120
 115#define PT_GPR31      124
 116#define PT_PC         128
 117#define PT_ORIG_GPR11 132
 118#define PT_SYSCALLNO  136
 119
 120#endif /* __ASM_OPENRISC_PTRACE_H */
 121