1/* 2 * include/asm-xtensa/ptrace.h 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 */ 10 11#ifndef _XTENSA_PTRACE_H 12#define _XTENSA_PTRACE_H 13 14/* 15 * Kernel stack 16 * 17 * +-----------------------+ -------- STACK_SIZE 18 * | register file | | 19 * +-----------------------+ | 20 * | struct pt_regs | | 21 * +-----------------------+ | ------ PT_REGS_OFFSET 22 * double : 16 bytes spill area : | ^ 23 * excetion :- - - - - - - - - - - -: | | 24 * frame : struct pt_regs : | | 25 * :- - - - - - - - - - - -: | | 26 * | | | | 27 * | memory stack | | | 28 * | | | | 29 * ~ ~ ~ ~ 30 * ~ ~ ~ ~ 31 * | | | | 32 * | | | | 33 * +-----------------------+ | | --- STACK_BIAS 34 * | struct task_struct | | | ^ 35 * current --> +-----------------------+ | | | 36 * | struct thread_info | | | | 37 * +-----------------------+ -------- 38 */ 39 40#define KERNEL_STACK_SIZE (2 * PAGE_SIZE) 41 42/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables). */ 43 44#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ 45#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ 46#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ 47#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ 48#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ 49#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ 50#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ 51#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ 52#define EXC_TABLE_SIZE 0x400 53 54/* Registers used by strace */ 55 56#define REG_A_BASE 0xfc000000 57#define REG_AR_BASE 0x04000000 58#define REG_PC 0x14000000 59#define REG_PS 0x080000e6 60#define REG_WB 0x08000048 61#define REG_WS 0x08000049 62#define REG_LBEG 0x08000000 63#define REG_LEND 0x08000001 64#define REG_LCOUNT 0x08000002 65#define REG_SAR 0x08000003 66#define REG_DEPC 0x080000c0 67#define REG_EXCCAUSE 0x080000e8 68#define REG_EXCVADDR 0x080000ee 69#define SYSCALL_NR 0x1 70 71#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1) 72 73/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ 74 75#define PTRACE_GETREGS 12 76#define PTRACE_SETREGS 13 77#define PTRACE_GETFPREGS 14 78#define PTRACE_SETFPREGS 15 79#define PTRACE_GETFPREGSIZE 18 80 81#ifndef __ASSEMBLY__ 82 83/* 84 * This struct defines the way the registers are stored on the 85 * kernel stack during a system call or other kernel entry. 86 */ 87struct pt_regs { 88 unsigned long pc; /* 4 */ 89 unsigned long ps; /* 8 */ 90 unsigned long depc; /* 12 */ 91 unsigned long exccause; /* 16 */ 92 unsigned long excvaddr; /* 20 */ 93 unsigned long debugcause; /* 24 */ 94 unsigned long wmask; /* 28 */ 95 unsigned long lbeg; /* 32 */ 96 unsigned long lend; /* 36 */ 97 unsigned long lcount; /* 40 */ 98 unsigned long sar; /* 44 */ 99 unsigned long windowbase; /* 48 */ 100 unsigned long windowstart; /* 52 */ 101 unsigned long syscall; /* 56 */ 102 unsigned long icountlevel; /* 60 */ 103 int reserved[1]; /* 64 */ 104 105 /* Make sure the areg field is 16 bytes aligned. */ 106 int align[0] __attribute__ ((aligned(16))); 107 108 /* current register frame. 109 * Note: The ESF for kernel exceptions ends after 16 registers! 110 */ 111 unsigned long areg[16]; /* 128 (64) */ 112}; 113 114#ifdef __KERNEL__ 115 116#include <asm/variant/core.h> 117 118# define task_pt_regs(tsk) ((struct pt_regs*) \ 119 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 120# define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 121# define instruction_pointer(regs) ((regs)->pc) 122extern void show_regs(struct pt_regs *); 123 124# ifndef CONFIG_SMP 125# define profile_pc(regs) instruction_pointer(regs) 126# endif 127#endif /* __KERNEL__ */ 128 129#else /* __ASSEMBLY__ */ 130 131#ifdef __KERNEL__ 132# include <asm/asm-offsets.h> 133#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 134#endif 135 136#endif /* !__ASSEMBLY__ */ 137#endif /* _XTENSA_PTRACE_H */ 138