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_EXCEPTION, 20 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1, 21 }; 22 23 struct stack_info { 24 enum stack_type type; 25 unsigned long *begin, *end, *next_sp; 26 }; 27 28 bool in_task_stack(unsigned long *stack, struct task_struct *task, 29 struct stack_info *info); 30 31 int get_stack_info(unsigned long *stack, struct task_struct *task, 32 struct stack_info *info, unsigned long *visit_mask); 33 34 const char *stack_type_name(enum stack_type type); 35 36 static inline bool on_stack(struct stack_info *info, void *addr, size_t len) 37 { 38 void *begin = info->begin; 39 void *end = info->end; 40 41 return (info->type != STACK_TYPE_UNKNOWN && 42 addr >= begin && addr < end && 43 addr + len > begin && addr + len <= end); 44 } 45 46 #ifdef CONFIG_X86_32 47 #define STACKSLOTS_PER_LINE 8 48 #else 49 #define STACKSLOTS_PER_LINE 4 50 #endif 51 52 #ifdef CONFIG_FRAME_POINTER 53 static inline unsigned long * 54 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 55 { 56 if (regs) 57 return (unsigned long *)regs->bp; 58 59 if (task == current) 60 return __builtin_frame_address(0); 61 62 return &((struct inactive_task_frame *)task->thread.sp)->bp; 63 } 64 #else 65 static inline unsigned long * 66 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 67 { 68 return NULL; 69 } 70 #endif /* CONFIG_FRAME_POINTER */ 71 72 static inline unsigned long * 73 get_stack_pointer(struct task_struct *task, struct pt_regs *regs) 74 { 75 if (regs) 76 return (unsigned long *)kernel_stack_pointer(regs); 77 78 if (task == current) 79 return __builtin_frame_address(0); 80 81 return (unsigned long *)task->thread.sp; 82 } 83 84 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, 85 unsigned long *stack, char *log_lvl); 86 87 extern unsigned int code_bytes; 88 89 /* The form of the top of the frame on the stack */ 90 struct stack_frame { 91 struct stack_frame *next_frame; 92 unsigned long return_address; 93 }; 94 95 struct stack_frame_ia32 { 96 u32 next_frame; 97 u32 return_address; 98 }; 99 100 static inline unsigned long caller_frame_pointer(void) 101 { 102 struct stack_frame *frame; 103 104 frame = __builtin_frame_address(0); 105 106 #ifdef CONFIG_FRAME_POINTER 107 frame = frame->next_frame; 108 #endif 109 110 return (unsigned long)frame; 111 } 112 113 #endif /* _ASM_X86_STACKTRACE_H */ 114