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/*
* 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__ */
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