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 enum stack_type {
  14         STACK_TYPE_UNKNOWN,
  15         STACK_TYPE_TASK,
  16         STACK_TYPE_IRQ,
  17         STACK_TYPE_SOFTIRQ,
  18         STACK_TYPE_EXCEPTION,
  19         STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
  20 };
  21
  22 struct stack_info {
  23         enum stack_type type;
  24         unsigned long *begin, *end, *next_sp;
  25 };
  26
  27 bool in_task_stack(unsigned long *stack, struct task_struct *task,
  28                    struct stack_info *info);
  29
  30 int get_stack_info(unsigned long *stack, struct task_struct *task,
  31                    struct stack_info *info, unsigned long *visit_mask);
  32
  33 const char *stack_type_name(enum stack_type type);
  34
  35 static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
  36 {
  37         void *begin = info->begin;
  38         void *end   = info->end;
  39
  40         return (info->type != STACK_TYPE_UNKNOWN &&
  41                 addr >= begin && addr < end &&
  42                 addr + len > begin && addr + len <= end);
  43 }
  44
  45 #ifdef CONFIG_X86_32
  46 #define STACKSLOTS_PER_LINE 8
  47 #else
  48 #define STACKSLOTS_PER_LINE 4
  49 #endif
  50
  51 #ifdef CONFIG_FRAME_POINTER
  52 static inline unsigned long *
  53 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  54 {
  55         if (regs)
  56                 return (unsigned long *)regs->bp;
  57
  58         if (task == current)
  59                 return __builtin_frame_address(0);
  60
  61         return &((struct inactive_task_frame *)task->thread.sp)->bp;
  62 }
  63 #else
  64 static inline unsigned long *
  65 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  66 {
  67         return NULL;
  68 }
  69 #endif /* CONFIG_FRAME_POINTER */
  70
  71 static inline unsigned long *
  72 get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
  73 {
  74         if (regs)
  75                 return (unsigned long *)kernel_stack_pointer(regs);
  76
  77         if (task == current)
  78                 return __builtin_frame_address(0);
  79
  80         return (unsigned long *)task->thread.sp;
  81 }
  82
  83 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  84                         unsigned long *stack, char *log_lvl);
  85
  86 extern unsigned int code_bytes;
  87
  88 /* The form of the top of the frame on the stack */
  89 struct stack_frame {
  90         struct stack_frame *next_frame;
  91         unsigned long return_address;
  92 };
  93
  94 struct stack_frame_ia32 {
  95     u32 next_frame;
  96     u32 return_address;
  97 };
  98
  99 static inline unsigned long caller_frame_pointer(void)
 100 {
 101         struct stack_frame *frame;
 102
 103         frame = __builtin_frame_address(0);
 104
 105 #ifdef CONFIG_FRAME_POINTER
 106         frame = frame->next_frame;
 107 #endif
 108
 109         return (unsigned long)frame;
 110 }
 111
 112 #endif /* _ASM_X86_STACKTRACE_H */