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 0x0000 57#define REG_AR_BASE 0x0100 58#define REG_PC 0x0020 59#define REG_PS 0x02e6 60#define REG_WB 0x0248 61#define REG_WS 0x0249 62#define REG_LBEG 0x0200 63#define REG_LEND 0x0201 64#define REG_LCOUNT 0x0202 65#define REG_SAR 0x0203 66 67#define SYSCALL_NR 0x00ff 68 69/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ 70 71#define PTRACE_GETREGS 12 72#define PTRACE_SETREGS 13 73#define PTRACE_GETXTREGS 18 74#define PTRACE_SETXTREGS 19 75 76#ifdef __KERNEL__ 77 78#ifndef __ASSEMBLY__ 79 80/* 81 * This struct defines the way the registers are stored on the 82 * kernel stack during a system call or other kernel entry. 83 */ 84struct pt_regs { 85 unsigned long pc; /* 4 */ 86 unsigned long ps; /* 8 */ 87 unsigned long depc; /* 12 */ 88 unsigned long exccause; /* 16 */ 89 unsigned long excvaddr; /* 20 */ 90 unsigned long debugcause; /* 24 */ 91 unsigned long wmask; /* 28 */ 92 unsigned long lbeg; /* 32 */ 93 unsigned long lend; /* 36 */ 94 unsigned long lcount; /* 40 */ 95 unsigned long sar; /* 44 */ 96 unsigned long windowbase; /* 48 */ 97 unsigned long windowstart; /* 52 */ 98 unsigned long syscall; /* 56 */ 99 unsigned long icountlevel; /* 60 */ 100 int reserved[1]; /* 64 */ 101 102 /* Additional configurable registers that are used by the compiler. */ 103 xtregs_opt_t xtregs_opt; 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#include <variant/core.h> 115 116# define task_pt_regs(tsk) ((struct pt_regs*) \ 117 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 118# define user_mode(regs) (((regs)->ps & 0x00000020)!=0) 119# define instruction_pointer(regs) ((regs)->pc) 120extern void show_regs(struct pt_regs *); 121 122# ifndef CONFIG_SMP 123# define profile_pc(regs) instruction_pointer(regs) 124# endif 125 126#else /* __ASSEMBLY__ */ 127 128# include <asm/asm-offsets.h> 129#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 130 131#endif /* !__ASSEMBLY__ */ 132 133#endif /* __KERNEL__ */ 134 135#endif /* _XTENSA_PTRACE_H */ 136