root/arch/x86/include/asm/stacktrace.h

INCLUDED FROM

DEFINITIONS

1. on_stack
2. get_frame_pointer
3. get_frame_pointer
4. get_stack_pointer

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Copyright (C) 1991, 1992  Linus Torvalds
   4  *  Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
   5  */
   6 
   7 #ifndef _ASM_X86_STACKTRACE_H
   8 #define _ASM_X86_STACKTRACE_H
   9 
  10 #include <linux/uaccess.h>
  11 #include <linux/ptrace.h>
  12 
  13 #include <asm/cpu_entry_area.h>
  14 #include <asm/switch_to.h>
  15 
  16 enum stack_type {
  17         STACK_TYPE_UNKNOWN,
  18         STACK_TYPE_TASK,
  19         STACK_TYPE_IRQ,
  20         STACK_TYPE_SOFTIRQ,
  21         STACK_TYPE_ENTRY,
  22         STACK_TYPE_EXCEPTION,
  23         STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
  24 };
  25 
  26 struct stack_info {
  27         enum stack_type type;
  28         unsigned long *begin, *end, *next_sp;
  29 };
  30 
  31 bool in_task_stack(unsigned long *stack, struct task_struct *task,
  32                    struct stack_info *info);
  33 
  34 bool in_entry_stack(unsigned long *stack, struct stack_info *info);
  35 
  36 int get_stack_info(unsigned long *stack, struct task_struct *task,
  37                    struct stack_info *info, unsigned long *visit_mask);
  38 
  39 const char *stack_type_name(enum stack_type type);
  40 
  41 static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
  42 {
  43         void *begin = info->begin;
  44         void *end   = info->end;
  45 
  46         return (info->type != STACK_TYPE_UNKNOWN &&
  47                 addr >= begin && addr < end &&
  48                 addr + len > begin && addr + len <= end);
  49 }
  50 
  51 #ifdef CONFIG_X86_32
  52 #define STACKSLOTS_PER_LINE 8
  53 #else
  54 #define STACKSLOTS_PER_LINE 4
  55 #endif
  56 
  57 #ifdef CONFIG_FRAME_POINTER
  58 static inline unsigned long *
  59 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  60 {
  61         if (regs)
  62                 return (unsigned long *)regs->bp;
  63 
  64         if (task == current)
  65                 return __builtin_frame_address(0);
  66 
  67         return &((struct inactive_task_frame *)task->thread.sp)->bp;
  68 }
  69 #else
  70 static inline unsigned long *
  71 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  72 {
  73         return NULL;
  74 }
  75 #endif /* CONFIG_FRAME_POINTER */
  76 
  77 static inline unsigned long *
  78 get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
  79 {
  80         if (regs)
  81                 return (unsigned long *)regs->sp;
  82 
  83         if (task == current)
  84                 return __builtin_frame_address(0);
  85 
  86         return (unsigned long *)task->thread.sp;
  87 }
  88 
  89 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  90                         unsigned long *stack, char *log_lvl);
  91 
  92 /* The form of the top of the frame on the stack */
  93 struct stack_frame {
  94         struct stack_frame *next_frame;
  95         unsigned long return_address;
  96 };
  97 
  98 struct stack_frame_ia32 {
  99     u32 next_frame;
 100     u32 return_address;
 101 };
 102 
 103 void show_opcodes(struct pt_regs *regs, const char *loglvl);
 104 void show_ip(struct pt_regs *regs, const char *loglvl);
 105 #endif /* _ASM_X86_STACKTRACE_H */