arch/x86/kernel/dumpstack.h

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
   4  */
   5
   6 #ifndef DUMPSTACK_H
   7 #define DUMPSTACK_H
   8
   9 #ifdef CONFIG_X86_32
  10 #define STACKSLOTS_PER_LINE 8
  11 #define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
  12 #else
  13 #define STACKSLOTS_PER_LINE 4
  14 #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
  15 #endif
  16
  17 #include <linux/uaccess.h>
  18
  19 extern void
  20 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  21                 unsigned long *stack, unsigned long bp, char *log_lvl);
  22
  23 extern void
  24 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
  25                 unsigned long *sp, unsigned long bp, char *log_lvl);
  26
  27 extern unsigned int code_bytes;
  28
  29 /* The form of the top of the frame on the stack */
  30 struct stack_frame {
  31         struct stack_frame *next_frame;
  32         unsigned long return_address;
  33 };
  34
  35 struct stack_frame_ia32 {
  36     u32 next_frame;
  37     u32 return_address;
  38 };
  39
  40 static inline unsigned long rewind_frame_pointer(int n)
  41 {
  42         struct stack_frame *frame;
  43
  44         get_bp(frame);
  45
  46 #ifdef CONFIG_FRAME_POINTER
  47         while (n--) {
  48                 if (probe_kernel_address(&frame->next_frame, frame))
  49                         break;
  50         }
  51 #endif
  52
  53         return (unsigned long)frame;
  54 }
  55
  56 #endif /* DUMPSTACK_H */