2 * include/asm-microblaze/ptrace.h -- Access to CPU registers
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>
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.
12 * Written by Miles Bader <miles@gnu.org>
13 * Microblaze port by John Williams
16 #ifndef __MICROBLAZE_PTRACE_H__
17 #define __MICROBLAZE_PTRACE_H__
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) */
28 /* These aren't official names, but they make some code more descriptive. */
37 #define GPR_RVAL GPR_RVAL0
41 /* `system' registers. */
42 /* Note these are old v850 values, microblaze has many fewer */
60 typedef unsigned long microblaze_reg_t;
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_*)! */
67 /* General purpose registers. */
68 microblaze_reg_t gpr[NUM_GPRS];
70 microblaze_reg_t pc; /* program counter */
71 microblaze_reg_t psw; /* program status word */
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 */
78 #define instruction_pointer(regs) ((regs)->pc)
79 #define user_mode(regs) (!(regs)->kernel_mode)
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))
88 #endif /* !__ASSEMBLY__ */
91 /* The number of bytes used to store each register. */
92 #define _PT_REG_SIZE 4
94 /* Offset of a general purpose register in a stuct pt_regs. */
95 #define PT_GPR(num) ((num) * _PT_REG_SIZE)
97 /* 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_KERNEL_MODE ((NUM_GPRS + 2) * _PT_REG_SIZE)
102 #define PT_SINGLESTEP ((NUM_GPRS + 3) * _PT_REG_SIZE)
104 #define PT_SYSCALL PT_GPR(0)
106 /* Size of struct pt_regs, including alignment. */
107 #define PT_SIZE ((NUM_GPRS + NUM_SPECIAL) * _PT_REG_SIZE)
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)
116 #endif /* __MICROBLAZE_PTRACE_H__ */