| Chris Zankel | 1387dab | 2016-08-10 18:36:44 +0300 | [diff] [blame] | 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 */ |