arch/x86/include/asm/stacktrace.h

   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 thread_info *tinfo,
  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 thread_info *tinfo,
  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 thread_info *tinfo,
  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         void (*warning)(void *data, char *msg);
  41         /* msg must contain %s for the symbol */
  42         void (*warning_symbol)(void *data, char *msg, unsigned long symbol);
  43         void (*address)(void *data, unsigned long address, int reliable);
  44         /* On negative return stop dumping */
  45         int (*stack)(void *data, char *name);
  46         walk_stack_t    walk_stack;
  47 };
  48
  49 void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
  50                 unsigned long *stack, unsigned long bp,
  51                 const struct stacktrace_ops *ops, void *data);
  52
  53 #ifdef CONFIG_X86_32
  54 #define STACKSLOTS_PER_LINE 8
  55 #define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
  56 #else
  57 #define STACKSLOTS_PER_LINE 4
  58 #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
  59 #endif
  60
  61 #ifdef CONFIG_FRAME_POINTER
  62 static inline unsigned long
  63 stack_frame(struct task_struct *task, struct pt_regs *regs)
  64 {
  65         unsigned long bp;
  66
  67         if (regs)
  68                 return regs->bp;
  69
  70         if (task == current) {
  71                 /* Grab bp right from our regs */
  72                 get_bp(bp);
  73                 return bp;
  74         }
  75
  76         /* bp is the last reg pushed by switch_to */
  77         return *(unsigned long *)task->thread.sp;
  78 }
  79 #else
  80 static inline unsigned long
  81 stack_frame(struct task_struct *task, struct pt_regs *regs)
  82 {
  83         return 0;
  84 }
  85 #endif
  86
  87 extern void
  88 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  89                    unsigned long *stack, unsigned long bp, char *log_lvl);
  90
  91 extern void
  92 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
  93                    unsigned long *sp, unsigned long bp, char *log_lvl);
  94
  95 extern unsigned int code_bytes;
  96
  97 /* The form of the top of the frame on the stack */
  98 struct stack_frame {
  99         struct stack_frame *next_frame;
 100         unsigned long return_address;
 101 };
 102
 103 struct stack_frame_ia32 {
 104     u32 next_frame;
 105     u32 return_address;
 106 };
 107
 108 static inline unsigned long caller_frame_pointer(void)
 109 {
 110         struct stack_frame *frame;
 111
 112         get_bp(frame);
 113
 114 #ifdef CONFIG_FRAME_POINTER
 115         frame = frame->next_frame;
 116 #endif
 117
 118         return (unsigned long)frame;
 119 }
 120
 121 #endif /* _ASM_X86_STACKTRACE_H */