arch/microblaze/include/asm/ptrace.h

   1 /*
   2  * include/asm-microblaze/ptrace.h -- Access to CPU registers
   3  *
   4  *  Copyright (C) 2003       John Williams <jwilliams@itee.uq.edu.au>
   5  *  Copyright (C) 2001,2002  NEC Corporation
   6  *  Copyright (C) 2001,2002  Miles Bader <miles@gnu.org>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General
   9  * Public License.  See the file COPYING in the main directory of this
  10  * archive for more details.
  11  *
  12  * Written by Miles Bader <miles@gnu.org>
  13  * Microblaze port by John Williams
  14  */
  15
  16 #ifndef __MICROBLAZE_PTRACE_H__
  17 #define __MICROBLAZE_PTRACE_H__
  18
  19
  20 /* Microblaze general purpose registers with special meanings.  */
  21 #define GPR_ZERO        0       /* constant zero */
  22 #define GPR_ASM         18      /* reserved for assembler */
  23 #define GPR_SP          1       /* stack pointer */
  24 #define GPR_GP          2       /* global data pointer */
  25 #define GPR_EP          30      /* `element pointer' */
  26 #define GPR_LP          15      /* link pointer (current return address) */
  27
  28 /* These aren't official names, but they make some code more descriptive.  */
  29 #define GPR_ARG0        5
  30 #define GPR_ARG1        6
  31 #define GPR_ARG2        7
  32 #define GPR_ARG3        8
  33 #define GPR_ARG4        9
  34 #define GPR_ARG5        10
  35 #define GPR_RVAL0       3
  36 #define GPR_RVAL1       4
  37 #define GPR_RVAL        GPR_RVAL0
  38
  39 #define NUM_GPRS        32
  40
  41 /* `system' registers.  */
  42 /* Note these are old v850 values, microblaze has many fewer */
  43 #define SR_EIPC         0
  44 #define SR_EIPSW        1
  45 #define SR_FEPC         2
  46 #define SR_FEPSW        3
  47 #define SR_ECR          4
  48 #define SR_PSW          5
  49 #define SR_CTPC         16
  50 #define SR_CTPSW        17
  51 #define SR_DBPC         18
  52 #define SR_DBPSW        19
  53 #define SR_CTBP         20
  54 #define SR_DIR          21
  55 #define SR_ASID         23
  56
  57
  58 #ifndef __ASSEMBLY__
  59
  60 typedef unsigned long microblaze_reg_t;
  61
  62 /* How processor state is stored on the stack during a syscall/signal.
  63    If you change this structure, change the associated assembly-language
  64    macros below too (PT_*)!  */
  65 struct pt_regs
  66 {
  67         /* General purpose registers.  */
  68         microblaze_reg_t gpr[NUM_GPRS];
  69
  70         microblaze_reg_t pc;            /* program counter */
  71         microblaze_reg_t psw;           /* program status word */
  72
  73         microblaze_reg_t kernel_mode;   /* 1 if in `kernel mode', 0 if user mode */
  74         microblaze_reg_t single_step;   /* 1 if in single step mode */
  75 };
  76
  77
  78 #define instruction_pointer(regs)       ((regs)->pc)
  79 #define user_mode(regs)                 (!(regs)->kernel_mode)
  80
  81 /* When a struct pt_regs is used to save user state for a system call in
  82    the kernel, the system call is stored in the space for R0 (since it's
  83    never used otherwise, R0 being a constant 0).  Non-system-calls
  84    simply store 0 there.  */
  85 #define PT_REGS_SYSCALL(regs)           (regs)->gpr[0]
  86 #define PT_REGS_SET_SYSCALL(regs, val)  ((regs)->gpr[0] = (val))
  87
  88 #endif /* !__ASSEMBLY__ */
  89
  90
  91 /* The number of bytes used to store each register.  */
  92 #define _PT_REG_SIZE    4
  93
  94 /* Offset of a general purpose register in a stuct pt_regs.  */
  95 #define PT_GPR(num)     ((num) * _PT_REG_SIZE)
  96
  97 /* Offsets of various special registers & fields in a struct pt_regs.  */
  98 #define NUM_SPECIAL     4
  99 #define PT_PC           ((NUM_GPRS + 0) * _PT_REG_SIZE)
 100 #define PT_PSW          ((NUM_GPRS + 1) * _PT_REG_SIZE)
 101 #define PT_KERNEL_MODE  ((NUM_GPRS + 2) * _PT_REG_SIZE)
 102 #define PT_SINGLESTEP   ((NUM_GPRS + 3) * _PT_REG_SIZE)
 103
 104 #define PT_SYSCALL      PT_GPR(0)
 105
 106 /* Size of struct pt_regs, including alignment.  */
 107 #define PT_SIZE         ((NUM_GPRS + NUM_SPECIAL) * _PT_REG_SIZE)
 108
 109 /* These are `magic' values for PTRACE_PEEKUSR that return info about where
 110    a process is located in memory.  */
 111 #define PT_TEXT_ADDR    (PT_SIZE + 1)
 112 #define PT_TEXT_LEN     (PT_SIZE + 2)
 113 #define PT_DATA_ADDR    (PT_SIZE + 3)
 114 #define PT_DATA_LEN     (PT_SIZE + 4)
 115
 116 #endif /* __MICROBLAZE_PTRACE_H__ */