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 (*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 */