stacktrace.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_STACKTRACE_H
 3#define __ASM_STACKTRACE_H
 4
 5#include <linux/llist.h>
 6#include <asm/ptrace.h>
 7#include <asm/sections.h>
 8
 9struct stackframe {
10	/*
11	 * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
12	 * and R11 otherwise.
13	 */
14	unsigned long fp;
15	unsigned long sp;
16	unsigned long lr;
17	unsigned long pc;
18
19	/* address of the LR value on the stack */
20	unsigned long *lr_addr;
21#ifdef CONFIG_KRETPROBES
22	struct llist_node *kr_cur;
23	struct task_struct *tsk;
24#endif
25#ifdef CONFIG_UNWINDER_FRAME_POINTER
26	bool ex_frame;
27#endif
28};
29
30static inline bool on_thread_stack(void)
31{
32	unsigned long delta = current_stack_pointer ^ (unsigned long)current->stack;
33
34	return delta < THREAD_SIZE;
35}
36
37static __always_inline
38void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
39{
40		frame->fp = frame_pointer(regs);
41		frame->sp = regs->ARM_sp;
42		frame->lr = regs->ARM_lr;
43		frame->pc = regs->ARM_pc;
44#ifdef CONFIG_KRETPROBES
45		frame->kr_cur = NULL;
46		frame->tsk = current;
47#endif
48#ifdef CONFIG_UNWINDER_FRAME_POINTER
49		frame->ex_frame = in_entry_text(frame->pc);
50#endif
51}
52
53extern int unwind_frame(struct stackframe *frame);
54extern void walk_stackframe(struct stackframe *frame,
55			    bool (*fn)(void *, unsigned long), void *data);
56extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
57		     unsigned long top);
58extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
59			   const char *loglvl);
60
61#endif	/* __ASM_STACKTRACE_H */