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 12 extern int kstack_depth_to_print; 13 14 struct thread_info; 15 struct stacktrace_ops; 16 17 typedef unsigned long (*walk_stack_t)(struct task_struct *task, 18 unsigned long *stack, 19 unsigned long bp, 20 const struct stacktrace_ops *ops, 21 void *data, 22 unsigned long *end, 23 int *graph); 24 25 extern unsigned long 26 print_context_stack(struct task_struct *task, 27 unsigned long *stack, unsigned long bp, 28 const struct stacktrace_ops *ops, void *data, 29 unsigned long *end, int *graph); 30 31 extern unsigned long 32 print_context_stack_bp(struct task_struct *task, 33 unsigned long *stack, unsigned long bp, 34 const struct stacktrace_ops *ops, void *data, 35 unsigned long *end, int *graph); 36 37 /* Generic stack tracer with callbacks */ 38 39 struct stacktrace_ops { 40 int (*address)(void *data, unsigned long address, int reliable); 41 /* On negative return stop dumping */ 42 int (*stack)(void *data, char *name); 43 walk_stack_t walk_stack; 44 }; 45 46 void dump_trace(struct task_struct *tsk, struct pt_regs *regs, 47 unsigned long *stack, unsigned long bp, 48 const struct stacktrace_ops *ops, void *data); 49 50 #ifdef CONFIG_X86_32 51 #define STACKSLOTS_PER_LINE 8 52 #define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :) 53 #else 54 #define STACKSLOTS_PER_LINE 4 55 #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :) 56 #endif 57 58 #ifdef CONFIG_FRAME_POINTER 59 static inline unsigned long 60 stack_frame(struct task_struct *task, struct pt_regs *regs) 61 { 62 unsigned long bp; 63 64 if (regs) 65 return regs->bp; 66 67 if (task == current) { 68 /* Grab bp right from our regs */ 69 get_bp(bp); 70 return bp; 71 } 72 73 /* bp is the last reg pushed by switch_to */ 74 return *(unsigned long *)task->thread.sp; 75 } 76 #else 77 static inline unsigned long 78 stack_frame(struct task_struct *task, struct pt_regs *regs) 79 { 80 return 0; 81 } 82 #endif 83 84 extern void 85 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, 86 unsigned long *stack, unsigned long bp, char *log_lvl); 87 88 extern void 89 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, 90 unsigned long *sp, unsigned long bp, char *log_lvl); 91 92 extern unsigned int code_bytes; 93 94 /* The form of the top of the frame on the stack */ 95 struct stack_frame { 96 struct stack_frame *next_frame; 97 unsigned long return_address; 98 }; 99 100 struct stack_frame_ia32 { 101 u32 next_frame; 102 u32 return_address; 103 }; 104 105 static inline unsigned long caller_frame_pointer(void) 106 { 107 struct stack_frame *frame; 108 109 get_bp(frame); 110 111 #ifdef CONFIG_FRAME_POINTER 112 frame = frame->next_frame; 113 #endif 114 115 return (unsigned long)frame; 116 } 117 118 #endif /* _ASM_X86_STACKTRACE_H */ 119