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 #include <asm/switch_to.h>
  12
  13 extern int kstack_depth_to_print;
  14
  15 struct thread_info;
  16 struct stacktrace_ops;
  17
  18 typedef unsigned long (*walk_stack_t)(struct task_struct *task,
  19                                       unsigned long *stack,
  20                                       unsigned long bp,
  21                                       const struct stacktrace_ops *ops,
  22                                       void *data,
  23                                       unsigned long *end,
  24                                       int *graph);
  25
  26 extern unsigned long
  27 print_context_stack(struct task_struct *task,
  28                     unsigned long *stack, unsigned long bp,
  29                     const struct stacktrace_ops *ops, void *data,
  30                     unsigned long *end, int *graph);
  31
  32 extern unsigned long
  33 print_context_stack_bp(struct task_struct *task,
  34                        unsigned long *stack, unsigned long bp,
  35                        const struct stacktrace_ops *ops, void *data,
  36                        unsigned long *end, int *graph);
  37
  38 /* Generic stack tracer with callbacks */
  39
  40 struct stacktrace_ops {
  41         int (*address)(void *data, unsigned long address, int reliable);
  42         /* On negative return stop dumping */
  43         int (*stack)(void *data, char *name);
  44         walk_stack_t    walk_stack;
  45 };
  46
  47 void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
  48                 unsigned long *stack, unsigned long bp,
  49                 const struct stacktrace_ops *ops, void *data);
  50
  51 #ifdef CONFIG_X86_32
  52 #define STACKSLOTS_PER_LINE 8
  53 #define get_bp(bp) asm("movl %%ebp, %0" : "=r" (bp) :)
  54 #else
  55 #define STACKSLOTS_PER_LINE 4
  56 #define get_bp(bp) asm("movq %%rbp, %0" : "=r" (bp) :)
  57 #endif
  58
  59 #ifdef CONFIG_FRAME_POINTER
  60 static inline unsigned long
  61 stack_frame(struct task_struct *task, struct pt_regs *regs)
  62 {
  63         unsigned long bp;
  64
  65         if (regs)
  66                 return regs->bp;
  67
  68         if (task == current) {
  69                 /* Grab bp right from our regs */
  70                 get_bp(bp);
  71                 return bp;
  72         }
  73
  74         return ((struct inactive_task_frame *)task->thread.sp)->bp;
  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 */