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__ */ 117