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 */ 117