| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
| 5 | */ |
| 6 | |
| 7 | #ifndef _ASM_X86_STACKTRACE_H |
| 8 | #define _ASM_X86_STACKTRACE_H |
| 9 | |
| 10 | #include <linux/uaccess.h> |
| 11 | #include <linux/ptrace.h> |
| 12 | #include <asm/switch_to.h> |
| 13 | |
| 14 | enum stack_type { |
| 15 | STACK_TYPE_UNKNOWN, |
| 16 | STACK_TYPE_TASK, |
| 17 | STACK_TYPE_IRQ, |
| 18 | STACK_TYPE_SOFTIRQ, |
| 19 | STACK_TYPE_ENTRY, |
| 20 | STACK_TYPE_EXCEPTION, |
| 21 | STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1, |
| 22 | }; |
| 23 | |
| 24 | struct stack_info { |
| 25 | enum stack_type type; |
| 26 | unsigned long *begin, *end, *next_sp; |
| 27 | }; |
| 28 | |
| 29 | bool in_task_stack(unsigned long *stack, struct task_struct *task, |
| 30 | struct stack_info *info); |
| 31 | |
| 32 | bool in_entry_stack(unsigned long *stack, struct stack_info *info); |
| 33 | |
| 34 | int get_stack_info(unsigned long *stack, struct task_struct *task, |
| 35 | struct stack_info *info, unsigned long *visit_mask); |
| 36 | |
| 37 | const char *stack_type_name(enum stack_type type); |
| 38 | |
| 39 | static inline bool on_stack(struct stack_info *info, void *addr, size_t len) |
| 40 | { |
| 41 | void *begin = info->begin; |
| 42 | void *end = info->end; |
| 43 | |
| 44 | return (info->type != STACK_TYPE_UNKNOWN && |
| 45 | addr >= begin && addr < end && |
| 46 | addr + len > begin && addr + len <= end); |
| 47 | } |
| 48 | |
| 49 | #ifdef CONFIG_X86_32 |
| 50 | #define STACKSLOTS_PER_LINE 8 |
| 51 | #else |
| 52 | #define STACKSLOTS_PER_LINE 4 |
| 53 | #endif |
| 54 | |
| 55 | #ifdef CONFIG_FRAME_POINTER |
| 56 | static inline unsigned long * |
| 57 | get_frame_pointer(struct task_struct *task, struct pt_regs *regs) |
| 58 | { |
| 59 | if (regs) |
| 60 | return (unsigned long *)regs->bp; |
| 61 | |
| 62 | if (task == current) |
| 63 | return __builtin_frame_address(0); |
| 64 | |
| 65 | return &((struct inactive_task_frame *)task->thread.sp)->bp; |
| 66 | } |
| 67 | #else |
| 68 | static inline unsigned long * |
| 69 | get_frame_pointer(struct task_struct *task, struct pt_regs *regs) |
| 70 | { |
| 71 | return NULL; |
| 72 | } |
| 73 | #endif /* CONFIG_FRAME_POINTER */ |
| 74 | |
| 75 | static inline unsigned long * |
| 76 | get_stack_pointer(struct task_struct *task, struct pt_regs *regs) |
| 77 | { |
| 78 | if (regs) |
| 79 | return (unsigned long *)kernel_stack_pointer(regs); |
| 80 | |
| 81 | if (task == current) |
| 82 | return __builtin_frame_address(0); |
| 83 | |
| 84 | return (unsigned long *)task->thread.sp; |
| 85 | } |
| 86 | |
| 87 | void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, |
| 88 | unsigned long *stack, char *log_lvl); |
| 89 | |
| 90 | /* The form of the top of the frame on the stack */ |
| 91 | struct stack_frame { |
| 92 | struct stack_frame *next_frame; |
| 93 | unsigned long return_address; |
| 94 | }; |
| 95 | |
| 96 | struct stack_frame_ia32 { |
| 97 | u32 next_frame; |
| 98 | u32 return_address; |
| 99 | }; |
| 100 | |
| 101 | static inline unsigned long caller_frame_pointer(void) |
| 102 | { |
| 103 | struct stack_frame *frame; |
| 104 | |
| 105 | frame = __builtin_frame_address(0); |
| 106 | |
| 107 | #ifdef CONFIG_FRAME_POINTER |
| 108 | frame = frame->next_frame; |
| 109 | #endif |
| 110 | |
| 111 | return (unsigned long)frame; |
| 112 | } |
| 113 | |
| 114 | void show_opcodes(struct pt_regs *regs, const char *loglvl); |
| 115 | void show_ip(struct pt_regs *regs, const char *loglvl); |
| 116 | #endif /* _ASM_X86_STACKTRACE_H */ |