1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * Copyright (C) 2001 - 2007 Tensilica Inc. 4 */ 5 6#ifndef _XTENSA_PTRACE_H 7#define _XTENSA_PTRACE_H 8 9#include <compiler.h> 10 11/* 12 * Kernel stack 13 * 14 * +-----------------------+ -------- STACK_SIZE 15 * | register file | | 16 * +-----------------------+ | 17 * | struct pt_regs | | 18 * +-----------------------+ | ------ PT_REGS_OFFSET 19 * double : 16 bytes spill area : | ^ 20 * exception :- - - - - - - - - - - -: | | 21 * frame : struct pt_regs : | | 22 * :- - - - - - - - - - - -: | | 23 * | | | | 24 * | memory stack | | | 25 * | | | | 26 * ~ ~ ~ ~ 27 * ~ ~ ~ ~ 28 * | | | | 29 * | | | | 30 * +-----------------------+ | | --- STACK_BIAS 31 * | struct task_struct | | | ^ 32 * current --> +-----------------------+ | | | 33 * | struct thread_info | | | | 34 * +-----------------------+ -------- 35 */ 36 37#define KERNEL_STACK_SIZE (2 * PAGE_SIZE) 38 39/* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */ 40 41#define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ 42#define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ 43#define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ 44#define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ 45#define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ 46#define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ 47#define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ 48#define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ 49#define EXC_TABLE_SIZE 0x400 50 51/* Registers used by strace */ 52 53#define REG_A_BASE 0xfc000000 54#define REG_AR_BASE 0x04000000 55#define REG_PC 0x14000000 56#define REG_PS 0x080000e6 57#define REG_WB 0x08000048 58#define REG_WS 0x08000049 59#define REG_LBEG 0x08000000 60#define REG_LEND 0x08000001 61#define REG_LCOUNT 0x08000002 62#define REG_SAR 0x08000003 63#define REG_DEPC 0x080000c0 64#define REG_EXCCAUSE 0x080000e8 65#define REG_EXCVADDR 0x080000ee 66#define SYSCALL_NR 0x1 67 68#define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1) 69 70/* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ 71 72#define PTRACE_GETREGS 12 73#define PTRACE_SETREGS 13 74#define PTRACE_GETFPREGS 14 75#define PTRACE_SETFPREGS 15 76#define PTRACE_GETFPREGSIZE 18 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 /* Make sure the areg field is 16 bytes aligned */ 103 int align[0] __aligned(16); 104 105 /* current register frame. 106 * Note: The ESF for kernel exceptions ends after 16 registers! 107 */ 108 unsigned long areg[16]; /* 128 (64) */ 109}; 110 111#ifdef __KERNEL__ 112 113# define task_pt_regs(tsk) ((struct pt_regs *) \ 114 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 115# define user_mode(regs) (((regs)->ps & 0x00000020) != 0) 116# define instruction_pointer(regs) ((regs)->pc) 117void show_regs(struct pt_regs *); 118 119# ifndef CONFIG_SMP 120# define profile_pc(regs) instruction_pointer(regs) 121# endif 122#endif /* __KERNEL__ */ 123 124#else /* __ASSEMBLY__ */ 125 126#ifdef __KERNEL__ 127# include <asm/asm-offsets.h> 128#define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 129#endif 130 131#endif /* !__ASSEMBLY__ */ 132#endif /* _XTENSA_PTRACE_H */ 133