/* * include/asm-microblaze/ptrace.h -- Access to CPU registers * * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * Copyright (C) 2001,2002 NEC Corporation * Copyright (C) 2001,2002 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> * Microblaze port by John Williams */ #ifndef __MICROBLAZE_PTRACE_H__ #define __MICROBLAZE_PTRACE_H__ /* Microblaze general purpose registers with special meanings. */ #define GPR_ZERO 0 /* constant zero */ #define GPR_ASM 18 /* reserved for assembler */ #define GPR_SP 1 /* stack pointer */ #define GPR_GP 2 /* global data pointer */ #define GPR_EP 30 /* `element pointer' */ #define GPR_LP 15 /* link pointer (current return address) */ /* These aren't official names, but they make some code more descriptive. */ #define GPR_ARG0 5 #define GPR_ARG1 6 #define GPR_ARG2 7 #define GPR_ARG3 8 #define GPR_ARG4 9 #define GPR_ARG5 10 #define GPR_RVAL0 3 #define GPR_RVAL1 4 #define GPR_RVAL GPR_RVAL0 #define NUM_GPRS 32 /* `system' registers. */ /* Note these are old v850 values, microblaze has many fewer */ #define SR_EIPC 0 #define SR_EIPSW 1 #define SR_FEPC 2 #define SR_FEPSW 3 #define SR_ECR 4 #define SR_PSW 5 #define SR_CTPC 16 #define SR_CTPSW 17 #define SR_DBPC 18 #define SR_DBPSW 19 #define SR_CTBP 20 #define SR_DIR 21 #define SR_ASID 23 #ifndef __ASSEMBLY__ typedef unsigned long microblaze_reg_t; /* How processor state is stored on the stack during a syscall/signal. If you change this structure, change the associated assembly-language macros below too (PT_*)! */ struct pt_regs { /* General purpose registers. */ microblaze_reg_t gpr[NUM_GPRS]; microblaze_reg_t pc; /* program counter */ microblaze_reg_t psw; /* program status word */ microblaze_reg_t kernel_mode; /* 1 if in `kernel mode', 0 if user mode */ microblaze_reg_t single_step; /* 1 if in single step mode */ }; #define instruction_pointer(regs) ((regs)->pc) #define user_mode(regs) (!(regs)->kernel_mode) /* When a struct pt_regs is used to save user state for a system call in the kernel, the system call is stored in the space for R0 (since it's never used otherwise, R0 being a constant 0). Non-system-calls simply store 0 there. */ #define PT_REGS_SYSCALL(regs) (regs)->gpr[0] #define PT_REGS_SET_SYSCALL(regs, val) ((regs)->gpr[0] = (val)) #endif /* !__ASSEMBLY__ */ /* The number of bytes used to store each register. */ #define _PT_REG_SIZE 4 /* Offset of a general purpose register in a stuct pt_regs. */ #define PT_GPR(num) ((num) * _PT_REG_SIZE) /* Offsets of various special registers & fields in a struct pt_regs. */ #define NUM_SPECIAL 4 #define PT_PC ((NUM_GPRS + 0) * _PT_REG_SIZE) #define PT_PSW ((NUM_GPRS + 1) * _PT_REG_SIZE) #define PT_KERNEL_MODE ((NUM_GPRS + 2) * _PT_REG_SIZE) #define PT_SINGLESTEP ((NUM_GPRS + 3) * _PT_REG_SIZE) #define PT_SYSCALL PT_GPR(0) /* Size of struct pt_regs, including alignment. */ #define PT_SIZE ((NUM_GPRS + NUM_SPECIAL) * _PT_REG_SIZE) /* These are `magic' values for PTRACE_PEEKUSR that return info about where a process is located in memory. */ #define PT_TEXT_ADDR (PT_SIZE + 1) #define PT_TEXT_LEN (PT_SIZE + 2) #define PT_DATA_ADDR (PT_SIZE + 3) #define PT_DATA_LEN (PT_SIZE + 4) #endif /* __MICROBLAZE_PTRACE_H__ */