LXR linux/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
  12extern int kstack_depth_to_print;
  13
  14struct thread_info;
  15struct stacktrace_ops;
  16
  17typedef 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
  25extern unsigned long
  26print_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
  31extern unsigned long
  32print_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
  39struct 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
  46void 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
  59static inline unsigned long
  60stack_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
  77static inline unsigned long
  78stack_frame(struct task_struct *task, struct pt_regs *regs)
  79{
  80        return 0;
  81}
  82#endif
  83
  84extern void
  85show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  86                   unsigned long *stack, unsigned long bp, char *log_lvl);
  87
  88extern void
  89show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
  90                   unsigned long *sp, unsigned long bp, char *log_lvl);
  91
  92extern unsigned int code_bytes;
  93
  94/* The form of the top of the frame on the stack */
  95struct stack_frame {
  96        struct stack_frame *next_frame;
  97        unsigned long return_address;
  98};
  99
 100struct stack_frame_ia32 {
 101    u32 next_frame;
 102    u32 return_address;
 103};
 104
 105static 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