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  */
  28 struct 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
  58 struct 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
  81 /* TODO: Rename this to REDZONE because that's what it is */
  82 #define STACK_FRAME_OVERHEAD  128  /* size of minimum stack frame */
  83
  84 #define instruction_pointer(regs)       ((regs)->pc)
  85 #define user_mode(regs)                 (((regs)->sr & SPR_SR_SM) == 0)
  86 #define user_stack_pointer(regs)        ((unsigned long)(regs)->sp)
  87 #define profile_pc(regs)                instruction_pointer(regs)
  88
  89 static inline long regs_return_value(struct pt_regs *regs)
  90 {
  91         return regs->gpr[11];
  92 }
  93
  94 #endif /* __ASSEMBLY__ */
  95
  96 /*
  97  * Offsets used by 'ptrace' system call interface.
  98  */
  99 #define PT_SR         0
 100 #define PT_SP         4
 101 #define PT_GPR2       8
 102 #define PT_GPR3       12
 103 #define PT_GPR4       16
 104 #define PT_GPR5       20
 105 #define PT_GPR6       24
 106 #define PT_GPR7       28
 107 #define PT_GPR8       32
 108 #define PT_GPR9       36
 109 #define PT_GPR10      40
 110 #define PT_GPR11      44
 111 #define PT_GPR12      48
 112 #define PT_GPR13      52
 113 #define PT_GPR14      56
 114 #define PT_GPR15      60
 115 #define PT_GPR16      64
 116 #define PT_GPR17      68
 117 #define PT_GPR18      72
 118 #define PT_GPR19      76
 119 #define PT_GPR20      80
 120 #define PT_GPR21      84
 121 #define PT_GPR22      88
 122 #define PT_GPR23      92
 123 #define PT_GPR24      96
 124 #define PT_GPR25      100
 125 #define PT_GPR26      104
 126 #define PT_GPR27      108
 127 #define PT_GPR28      112
 128 #define PT_GPR29      116
 129 #define PT_GPR30      120
 130 #define PT_GPR31      124
 131 #define PT_PC         128
 132 #define PT_ORIG_GPR11 132
 133 #define PT_SYSCALLNO  136
 134
 135 #endif /* __KERNEL__ */
 136
 137 #endif /* __ASM_OPENRISC_PTRACE_H */