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Linux/arch/openrisc/include/asm/ptrace.h

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  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 */
125 

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