arch/x86/include/asm/stacktrace.h

   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 #include <asm/switch_to.h>
  13
  14 enum stack_type {
  15         STACK_TYPE_UNKNOWN,
  16         STACK_TYPE_TASK,
  17         STACK_TYPE_IRQ,
  18         STACK_TYPE_SOFTIRQ,
  19         STACK_TYPE_ENTRY,
  20         STACK_TYPE_EXCEPTION,
  21         STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
  22 };
  23
  24 struct stack_info {
  25         enum stack_type type;
  26         unsigned long *begin, *end, *next_sp;
  27 };
  28
  29 bool in_task_stack(unsigned long *stack, struct task_struct *task,
  30                    struct stack_info *info);
  31
  32 bool in_entry_stack(unsigned long *stack, struct stack_info *info);
  33
  34 int get_stack_info(unsigned long *stack, struct task_struct *task,
  35                    struct stack_info *info, unsigned long *visit_mask);
  36
  37 const char *stack_type_name(enum stack_type type);
  38
  39 static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
  40 {
  41         void *begin = info->begin;
  42         void *end   = info->end;
  43
  44         return (info->type != STACK_TYPE_UNKNOWN &&
  45                 addr >= begin && addr < end &&
  46                 addr + len > begin && addr + len <= end);
  47 }
  48
  49 #ifdef CONFIG_X86_32
  50 #define STACKSLOTS_PER_LINE 8
  51 #else
  52 #define STACKSLOTS_PER_LINE 4
  53 #endif
  54
  55 #ifdef CONFIG_FRAME_POINTER
  56 static inline unsigned long *
  57 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  58 {
  59         if (regs)
  60                 return (unsigned long *)regs->bp;
  61
  62         if (task == current)
  63                 return __builtin_frame_address(0);
  64
  65         return &((struct inactive_task_frame *)task->thread.sp)->bp;
  66 }
  67 #else
  68 static inline unsigned long *
  69 get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
  70 {
  71         return NULL;
  72 }
  73 #endif /* CONFIG_FRAME_POINTER */
  74
  75 static inline unsigned long *
  76 get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
  77 {
  78         if (regs)
  79                 return (unsigned long *)kernel_stack_pointer(regs);
  80
  81         if (task == current)
  82                 return __builtin_frame_address(0);
  83
  84         return (unsigned long *)task->thread.sp;
  85 }
  86
  87 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
  88                         unsigned long *stack, char *log_lvl);
  89
  90 /* The form of the top of the frame on the stack */
  91 struct stack_frame {
  92         struct stack_frame *next_frame;
  93         unsigned long return_address;
  94 };
  95
  96 struct stack_frame_ia32 {
  97     u32 next_frame;
  98     u32 return_address;
  99 };
 100
 101 static inline unsigned long caller_frame_pointer(void)
 102 {
 103         struct stack_frame *frame;
 104
 105         frame = __builtin_frame_address(0);
 106
 107 #ifdef CONFIG_FRAME_POINTER
 108         frame = frame->next_frame;
 109 #endif
 110
 111         return (unsigned long)frame;
 112 }
 113
 114 void show_opcodes(struct pt_regs *regs, const char *loglvl);
 115 void show_ip(struct pt_regs *regs, const char *loglvl);
 116 #endif /* _ASM_X86_STACKTRACE_H */