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 bool get_stack_info_noinstr(unsigned long *stack, struct task_struct *task, 39 struct stack_info *info); 40 41 const char *stack_type_name(enum stack_type type); 42 43 static inline bool on_stack(struct stack_info *info, void *addr, size_t len) 44 { 45 void *begin = info->begin; 46 void *end = info->end; 47 48 return (info->type != STACK_TYPE_UNKNOWN && 49 addr >= begin && addr < end && 50 addr + len > begin && addr + len <= end); 51 } 52 53 #ifdef CONFIG_X86_32 54 #define STACKSLOTS_PER_LINE 8 55 #else 56 #define STACKSLOTS_PER_LINE 4 57 #endif 58 59 #ifdef CONFIG_FRAME_POINTER 60 static inline unsigned long * 61 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 62 { 63 if (regs) 64 return (unsigned long *)regs->bp; 65 66 if (task == current) 67 return __builtin_frame_address(0); 68 69 return &((struct inactive_task_frame *)task->thread.sp)->bp; 70 } 71 #else 72 static inline unsigned long * 73 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 74 { 75 return NULL; 76 } 77 #endif /* CONFIG_FRAME_POINTER */ 78 79 static inline unsigned long * 80 get_stack_pointer(struct task_struct *task, struct pt_regs *regs) 81 { 82 if (regs) 83 return (unsigned long *)regs->sp; 84 85 if (task == current) 86 return __builtin_frame_address(0); 87 88 return (unsigned long *)task->thread.sp; 89 } 90 91 /* The form of the top of the frame on the stack */ 92 struct stack_frame { 93 struct stack_frame *next_frame; 94 unsigned long return_address; 95 }; 96 97 struct stack_frame_ia32 { 98 u32 next_frame; 99 u32 return_address; 100 }; 101 102 void show_opcodes(struct pt_regs *regs, const char *loglvl); 103 void show_ip(struct pt_regs *regs, const char *loglvl); 104 #endif /* _ASM_X86_STACKTRACE_H */ 105