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
  43 struct 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
  78 static 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 */