include/asm-v850/ptrace.h

   1 /*
   2  * include/asm-v850/ptrace.h -- Access to CPU registers
   3  *
   4  *  Copyright (C) 2001,02,03  NEC Electronics Corporation
   5  *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
   6  *
   7  * This file is subject to the terms and conditions of the GNU General
   8  * Public License.  See the file COPYING in the main directory of this
   9  * archive for more details.
  10  *
  11  * Written by Miles Bader <miles@gnu.org>
  12  */
  13
  14 #ifndef __V850_PTRACE_H__
  15 #define __V850_PTRACE_H__
  16
  17
  18 /* v850 general purpose registers with special meanings.  */
  19 #define GPR_ZERO        0       /* constant zero */
  20 #define GPR_ASM         1       /* reserved for assembler */
  21 #define GPR_SP          3       /* stack pointer */
  22 #define GPR_GP          4       /* global data pointer */
  23 #define GPR_TP          5       /* `text pointer' */
  24 #define GPR_EP          30      /* `element pointer' */
  25 #define GPR_LP          31      /* link pointer (current return address) */
  26
  27 /* These aren't official names, but they make some code more descriptive.  */
  28 #define GPR_ARG0        6
  29 #define GPR_ARG1        7
  30 #define GPR_ARG2        8
  31 #define GPR_ARG3        9
  32 #define GPR_RVAL0       10
  33 #define GPR_RVAL1       11
  34 #define GPR_RVAL        GPR_RVAL0
  35
  36 #define NUM_GPRS        32
  37
  38 /* v850 `system' registers.  */
  39 #define SR_EIPC         0
  40 #define SR_EIPSW        1
  41 #define SR_FEPC         2
  42 #define SR_FEPSW        3
  43 #define SR_ECR          4
  44 #define SR_PSW          5
  45 #define SR_CTPC         16
  46 #define SR_CTPSW        17
  47 #define SR_DBPC         18
  48 #define SR_DBPSW        19
  49 #define SR_CTBP         20
  50 #define SR_DIR          21
  51 #define SR_ASID         23
  52
  53
  54 #ifndef __ASSEMBLY__
  55
  56 typedef unsigned long v850_reg_t;
  57
  58 /* How processor state is stored on the stack during a syscall/signal.
  59    If you change this structure, change the associated assembly-language
  60    macros below too (PT_*)!  */
  61 struct pt_regs
  62 {
  63         /* General purpose registers.  */
  64         v850_reg_t gpr[NUM_GPRS];
  65
  66         v850_reg_t pc;          /* program counter */
  67         v850_reg_t psw;         /* program status word */
  68
  69         /* Registers used by `callt' instruction:  */
  70         v850_reg_t ctpc;        /* saved program counter */
  71         v850_reg_t ctpsw;       /* saved psw */
  72         v850_reg_t ctbp;        /* base pointer for callt table */
  73
  74         char kernel_mode;       /* 1 if in `kernel mode', 0 if user mode */
  75 };
  76
  77
  78 #define instruction_pointer(regs)       ((regs)->pc)
  79 #define profile_pc(regs) instruction_pointer(regs)
  80 #define user_mode(regs)                 (!(regs)->kernel_mode)
  81
  82 /* When a struct pt_regs is used to save user state for a system call in
  83    the kernel, the system call is stored in the space for R0 (since it's
  84    never used otherwise, R0 being a constant 0).  Non-system-calls
  85    simply store 0 there.  */
  86 #define PT_REGS_SYSCALL(regs)           (regs)->gpr[0]
  87 #define PT_REGS_SET_SYSCALL(regs, val)  ((regs)->gpr[0] = (val))
  88
  89 #endif /* !__ASSEMBLY__ */
  90
  91
  92 /* The number of bytes used to store each register.  */
  93 #define _PT_REG_SIZE    4
  94
  95 /* Offset of a general purpose register in a stuct pt_regs.  */
  96 #define PT_GPR(num)     ((num) * _PT_REG_SIZE)
  97
  98 /* Offsets of various special registers & fields in a struct pt_regs.  */
  99 #define PT_PC           ((NUM_GPRS + 0) * _PT_REG_SIZE)
 100 #define PT_PSW          ((NUM_GPRS + 1) * _PT_REG_SIZE)
 101 #define PT_CTPC         ((NUM_GPRS + 2) * _PT_REG_SIZE)
 102 #define PT_CTPSW        ((NUM_GPRS + 3) * _PT_REG_SIZE)
 103 #define PT_CTBP         ((NUM_GPRS + 4) * _PT_REG_SIZE)
 104 #define PT_KERNEL_MODE  ((NUM_GPRS + 5) * _PT_REG_SIZE)
 105
 106 /* Where the current syscall number is stashed; obviously only valid in
 107    the kernel!  */
 108 #define PT_CUR_SYSCALL  PT_GPR(0)
 109
 110 /* Size of struct pt_regs, including alignment.  */
 111 #define PT_SIZE         ((NUM_GPRS + 6) * _PT_REG_SIZE)
 112
 113
 114 /* These are `magic' values for PTRACE_PEEKUSR that return info about where
 115    a process is located in memory.  */
 116 #define PT_TEXT_ADDR    (PT_SIZE + 1)
 117 #define PT_TEXT_LEN     (PT_SIZE + 2)
 118 #define PT_DATA_ADDR    (PT_SIZE + 3)
 119
 120
 121 #endif /* __V850_PTRACE_H__ */