1 /* 2 * Copyright (C) 2001 - 2007 Tensilica Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #ifndef _XTENSA_PTRACE_H 8 #define _XTENSA_PTRACE_H 9 10 #include <compiler.h> 11 12 /* 13 * Kernel stack 14 * 15 * +-----------------------+ -------- STACK_SIZE 16 * | register file | | 17 * +-----------------------+ | 18 * | struct pt_regs | | 19 * +-----------------------+ | ------ PT_REGS_OFFSET 20 * double : 16 bytes spill area : | ^ 21 * exception :- - - - - - - - - - - -: | | 22 * frame : struct pt_regs : | | 23 * :- - - - - - - - - - - -: | | 24 * | | | | 25 * | memory stack | | | 26 * | | | | 27 * ~ ~ ~ ~ 28 * ~ ~ ~ ~ 29 * | | | | 30 * | | | | 31 * +-----------------------+ | | --- STACK_BIAS 32 * | struct task_struct | | | ^ 33 * current --> +-----------------------+ | | | 34 * | struct thread_info | | | | 35 * +-----------------------+ -------- 36 */ 37 38 #define KERNEL_STACK_SIZE (2 * PAGE_SIZE) 39 40 /* Offsets for exception_handlers[] (3 x 64-entries x 4-byte tables) */ 41 42 #define EXC_TABLE_KSTK 0x004 /* Kernel Stack */ 43 #define EXC_TABLE_DOUBLE_SAVE 0x008 /* Double exception save area for a0 */ 44 #define EXC_TABLE_FIXUP 0x00c /* Fixup handler */ 45 #define EXC_TABLE_PARAM 0x010 /* For passing a parameter to fixup */ 46 #define EXC_TABLE_SYSCALL_SAVE 0x014 /* For fast syscall handler */ 47 #define EXC_TABLE_FAST_USER 0x100 /* Fast user exception handler */ 48 #define EXC_TABLE_FAST_KERNEL 0x200 /* Fast kernel exception handler */ 49 #define EXC_TABLE_DEFAULT 0x300 /* Default C-Handler */ 50 #define EXC_TABLE_SIZE 0x400 51 52 /* Registers used by strace */ 53 54 #define REG_A_BASE 0xfc000000 55 #define REG_AR_BASE 0x04000000 56 #define REG_PC 0x14000000 57 #define REG_PS 0x080000e6 58 #define REG_WB 0x08000048 59 #define REG_WS 0x08000049 60 #define REG_LBEG 0x08000000 61 #define REG_LEND 0x08000001 62 #define REG_LCOUNT 0x08000002 63 #define REG_SAR 0x08000003 64 #define REG_DEPC 0x080000c0 65 #define REG_EXCCAUSE 0x080000e8 66 #define REG_EXCVADDR 0x080000ee 67 #define SYSCALL_NR 0x1 68 69 #define AR_REGNO_TO_A_REGNO(ar, wb) (ar - wb*4) & ~(XCHAL_NUM_AREGS - 1) 70 71 /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */ 72 73 #define PTRACE_GETREGS 12 74 #define PTRACE_SETREGS 13 75 #define PTRACE_GETFPREGS 14 76 #define PTRACE_SETFPREGS 15 77 #define PTRACE_GETFPREGSIZE 18 78 79 #ifndef __ASSEMBLY__ 80 81 /* 82 * This struct defines the way the registers are stored on the 83 * kernel stack during a system call or other kernel entry. 84 */ 85 struct pt_regs { 86 unsigned long pc; /* 4 */ 87 unsigned long ps; /* 8 */ 88 unsigned long depc; /* 12 */ 89 unsigned long exccause; /* 16 */ 90 unsigned long excvaddr; /* 20 */ 91 unsigned long debugcause; /* 24 */ 92 unsigned long wmask; /* 28 */ 93 unsigned long lbeg; /* 32 */ 94 unsigned long lend; /* 36 */ 95 unsigned long lcount; /* 40 */ 96 unsigned long sar; /* 44 */ 97 unsigned long windowbase; /* 48 */ 98 unsigned long windowstart; /* 52 */ 99 unsigned long syscall; /* 56 */ 100 unsigned long icountlevel; /* 60 */ 101 int reserved[1]; /* 64 */ 102 103 /* Make sure the areg field is 16 bytes aligned */ 104 int align[0] __aligned(16); 105 106 /* current register frame. 107 * Note: The ESF for kernel exceptions ends after 16 registers! 108 */ 109 unsigned long areg[16]; /* 128 (64) */ 110 }; 111 112 #ifdef __KERNEL__ 113 114 # define task_pt_regs(tsk) ((struct pt_regs *) \ 115 (task_stack_page(tsk) + KERNEL_STACK_SIZE - (XCHAL_NUM_AREGS-16)*4) - 1) 116 # define user_mode(regs) (((regs)->ps & 0x00000020) != 0) 117 # define instruction_pointer(regs) ((regs)->pc) 118 void show_regs(struct pt_regs *); 119 120 # ifndef CONFIG_SMP 121 # define profile_pc(regs) instruction_pointer(regs) 122 # endif 123 #endif /* __KERNEL__ */ 124 125 #else /* __ASSEMBLY__ */ 126 127 #ifdef __KERNEL__ 128 # include <asm/asm-offsets.h> 129 #define PT_REGS_OFFSET (KERNEL_STACK_SIZE - PT_USER_SIZE) 130 #endif 131 132 #endif /* !__ASSEMBLY__ */ 133 #endif /* _XTENSA_PTRACE_H */ 134