/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_STACKTRACE_H
#define __ASM_STACKTRACE_H

#include <linux/llist.h>
#include <asm/ptrace.h>
#include <asm/sections.h>

struct stackframe {
        /*
         * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled
         * and R11 otherwise.
         */
        unsigned long fp;
        unsigned long sp;
        unsigned long lr;
        unsigned long pc;

        /* address of the LR value on the stack */
        unsigned long *lr_addr;
#ifdef CONFIG_KRETPROBES
        struct llist_node *kr_cur;
        struct task_struct *tsk;
#endif
#ifdef CONFIG_UNWINDER_FRAME_POINTER
        bool ex_frame;
#endif
};

static inline bool on_thread_stack(void)
{
        unsigned long delta = current_stack_pointer ^ (unsigned long)current->stack;

        return delta < THREAD_SIZE;
}

static __always_inline
void arm_get_current_stackframe(struct pt_regs *regs, struct stackframe *frame)
{
                frame->fp = frame_pointer(regs);
                frame->sp = regs->ARM_sp;
                frame->lr = regs->ARM_lr;
                frame->pc = regs->ARM_pc;
#ifdef CONFIG_KRETPROBES
                frame->kr_cur = NULL;
                frame->tsk = current;
#endif
#ifdef CONFIG_UNWINDER_FRAME_POINTER
                frame->ex_frame = in_entry_text(frame->pc);
#endif
}

extern int unwind_frame(struct stackframe *frame);
extern void walk_stackframe(struct stackframe *frame,
                            bool (*fn)(void *, unsigned long), void *data);
extern void dump_mem(const char *lvl, const char *str, unsigned long bottom,
                     unsigned long top);
extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
                           const char *loglvl);

#endif  /* __ASM_STACKTRACE_H */