arch/arm/include/asm/stacktrace.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_STACKTRACE_H
   3 #define __ASM_STACKTRACE_H
   4
   5 #include <asm/ptrace.h>
   6 #include <linux/llist.h>
   7
   8 struct stackframe {
   9         /*
  10          * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
  11          * and R11 otherwise.
  12          */
  13         unsigned long fp;
  14         unsigned long sp;
  15         unsigned long lr;
  16         unsigned long pc;
  17
  18         /* address of the LR value on the stack */
  19         unsigned long *lr_addr;
  20 #ifdef CONFIG_KRETPROBES
  21         struct llist_node *kr_cur;
  22         struct task_struct *tsk;
  23 #endif
  24 #ifdef CONFIG_UNWINDER_FRAME_POINTER
  25         bool ex_frame;
  26 #endif
  27 };
  28
  29 static __always_inline
  30 void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
  31 {
  32                 frame->fp = frame_pointer(regs);
  33                 frame->sp = regs->ARM_sp;
  34                 frame->lr = regs->ARM_lr;
  35                 frame->pc = regs->ARM_pc;
  36 #ifdef CONFIG_KRETPROBES
  37                 frame->kr_cur = NULL;
  38                 frame->tsk = current;
  39 #endif
  40 #ifdef CONFIG_UNWINDER_FRAME_POINTER
  41                 frame->ex_frame = in_entry_text(frame->pc);
  42 #endif
  43 }
  44
  45 extern int unwind_frame(struct stackframe *frame);
  46 extern void walk_stackframe(struct stackframe *frame,
  47                             bool (*fn)(void *, unsigned long), void *data);
  48 extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
  49                      unsigned long top);
  50 extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
  51                            const char *loglvl);
  52
  53 #endif  /* __ASM_STACKTRACE_H */