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 13 #include <asm/cpu_entry_area.h> 14 #include <asm/switch_to.h> 15 16 enum stack_type { 17 STACK_TYPE_UNKNOWN, 18 STACK_TYPE_TASK, 19 STACK_TYPE_IRQ, 20 STACK_TYPE_SOFTIRQ, 21 STACK_TYPE_ENTRY, 22 STACK_TYPE_EXCEPTION, 23 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1, 24 }; 25 26 struct stack_info { 27 enum stack_type type; 28 unsigned long *begin, *end, *next_sp; 29 }; 30 31 bool in_task_stack(unsigned long *stack, struct task_struct *task, 32 struct stack_info *info); 33 34 bool in_entry_stack(unsigned long *stack, struct stack_info *info); 35 36 int get_stack_info(unsigned long *stack, struct task_struct *task, 37 struct stack_info *info, unsigned long *visit_mask); 38 39 const char *stack_type_name(enum stack_type type); 40 41 static inline bool on_stack(struct stack_info *info, void *addr, size_t len) 42 { 43 void *begin = info->begin; 44 void *end = info->end; 45 46 return (info->type != STACK_TYPE_UNKNOWN && 47 addr >= begin && addr < end && 48 addr + len > begin && addr + len <= end); 49 } 50 51 #ifdef CONFIG_X86_32 52 #define STACKSLOTS_PER_LINE 8 53 #else 54 #define STACKSLOTS_PER_LINE 4 55 #endif 56 57 #ifdef CONFIG_FRAME_POINTER 58 static inline unsigned long * 59 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 60 { 61 if (regs) 62 return (unsigned long *)regs->bp; 63 64 if (task == current) 65 return __builtin_frame_address(0); 66 67 return &((struct inactive_task_frame *)task->thread.sp)->bp; 68 } 69 #else 70 static inline unsigned long * 71 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 72 { 73 return NULL; 74 } 75 #endif /* CONFIG_FRAME_POINTER */ 76 77 static inline unsigned long * 78 get_stack_pointer(struct task_struct *task, struct pt_regs *regs) 79 { 80 if (regs) 81 return (unsigned long *)kernel_stack_pointer(regs); 82 83 if (task == current) 84 return __builtin_frame_address(0); 85 86 return (unsigned long *)task->thread.sp; 87 } 88 89 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, 90 unsigned long *stack, char *log_lvl); 91 92 /* The form of the top of the frame on the stack */ 93 struct stack_frame { 94 struct stack_frame *next_frame; 95 unsigned long return_address; 96 }; 97 98 struct stack_frame_ia32 { 99 u32 next_frame; 100 u32 return_address; 101 }; 102 103 void show_opcodes(struct pt_regs *regs, const char *loglvl); 104 void show_ip(struct pt_regs *regs, const char *loglvl); 105 #endif /* _ASM_X86_STACKTRACE_H */ 106