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
 8struct 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
29static __always_inline
30void 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
45extern int unwind_frame(struct stackframe *frame);
46extern void walk_stackframe(struct stackframe *frame,
47			    bool (*fn)(void *, unsigned long), void *data);
48extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
49		     unsigned long top);
50extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
51			   const char *loglvl);
52
53#endif	/* __ASM_STACKTRACE_H */