1 /* 2 * Copyright (C) 1991, 1992 Linus Torvalds 3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs 4 */ 5 6 #ifndef _ASM_X86_STACKTRACE_H 7 #define _ASM_X86_STACKTRACE_H 8 9 #include <linux/uaccess.h> 10 #include <linux/ptrace.h> 11 #include <asm/switch_to.h> 12 13 enum stack_type { 14 STACK_TYPE_UNKNOWN, 15 STACK_TYPE_TASK, 16 STACK_TYPE_IRQ, 17 STACK_TYPE_SOFTIRQ, 18 STACK_TYPE_EXCEPTION, 19 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1, 20 }; 21 22 struct stack_info { 23 enum stack_type type; 24 unsigned long *begin, *end, *next_sp; 25 }; 26 27 bool in_task_stack(unsigned long *stack, struct task_struct *task, 28 struct stack_info *info); 29 30 int get_stack_info(unsigned long *stack, struct task_struct *task, 31 struct stack_info *info, unsigned long *visit_mask); 32 33 void stack_type_str(enum stack_type type, const char **begin, 34 const char **end); 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 extern int kstack_depth_to_print; 47 48 struct thread_info; 49 struct stacktrace_ops; 50 51 typedef unsigned long (*walk_stack_t)(struct task_struct *task, 52 unsigned long *stack, 53 unsigned long bp, 54 const struct stacktrace_ops *ops, 55 void *data, 56 struct stack_info *info, 57 int *graph); 58 59 extern unsigned long 60 print_context_stack(struct task_struct *task, 61 unsigned long *stack, unsigned long bp, 62 const struct stacktrace_ops *ops, void *data, 63 struct stack_info *info, int *graph); 64 65 extern unsigned long 66 print_context_stack_bp(struct task_struct *task, 67 unsigned long *stack, unsigned long bp, 68 const struct stacktrace_ops *ops, void *data, 69 struct stack_info *info, int *graph); 70 71 /* Generic stack tracer with callbacks */ 72 73 struct stacktrace_ops { 74 int (*address)(void *data, unsigned long address, int reliable); 75 /* On negative return stop dumping */ 76 int (*stack)(void *data, const char *name); 77 walk_stack_t walk_stack; 78 }; 79 80 void dump_trace(struct task_struct *tsk, struct pt_regs *regs, 81 unsigned long *stack, unsigned long bp, 82 const struct stacktrace_ops *ops, void *data); 83 84 #ifdef CONFIG_X86_32 85 #define STACKSLOTS_PER_LINE 8 86 #else 87 #define STACKSLOTS_PER_LINE 4 88 #endif 89 90 #ifdef CONFIG_FRAME_POINTER 91 static inline unsigned long * 92 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 93 { 94 if (regs) 95 return (unsigned long *)regs->bp; 96 97 if (task == current) 98 return __builtin_frame_address(0); 99 100 return (unsigned long *)((struct inactive_task_frame *)task->thread.sp)->bp; 101 } 102 #else 103 static inline unsigned long * 104 get_frame_pointer(struct task_struct *task, struct pt_regs *regs) 105 { 106 return NULL; 107 } 108 #endif /* CONFIG_FRAME_POINTER */ 109 110 static inline unsigned long * 111 get_stack_pointer(struct task_struct *task, struct pt_regs *regs) 112 { 113 if (regs) 114 return (unsigned long *)kernel_stack_pointer(regs); 115 116 if (task == current) 117 return __builtin_frame_address(0); 118 119 return (unsigned long *)task->thread.sp; 120 } 121 122 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, 123 unsigned long *stack, char *log_lvl); 124 125 void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, 126 unsigned long *sp, char *log_lvl); 127 128 extern unsigned int code_bytes; 129 130 /* The form of the top of the frame on the stack */ 131 struct stack_frame { 132 struct stack_frame *next_frame; 133 unsigned long return_address; 134 }; 135 136 struct stack_frame_ia32 { 137 u32 next_frame; 138 u32 return_address; 139 }; 140 141 static inline unsigned long caller_frame_pointer(void) 142 { 143 struct stack_frame *frame; 144 145 frame = __builtin_frame_address(0); 146 147 #ifdef CONFIG_FRAME_POINTER 148 frame = frame->next_frame; 149 #endif 150 151 return (unsigned long)frame; 152 } 153 154 #endif /* _ASM_X86_STACKTRACE_H */ 155