/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_UNWIND_USER_H
#define _ASM_X86_UNWIND_USER_H

#ifdef CONFIG_UNWIND_USER

#include <asm/ptrace.h>
#include <asm/uprobes.h>

static inline int unwind_user_word_size(struct pt_regs *regs)
{
        /* We can't unwind VM86 stacks */
        if (regs->flags & X86_VM_MASK)
                return 0;
        return user_64bit_mode(regs) ? 8 : 4;
}

#endif /* CONFIG_UNWIND_USER */

#ifdef CONFIG_HAVE_UNWIND_USER_FP

#define ARCH_INIT_USER_FP_FRAME(ws)                     \
        .cfa_off        =  2*(ws),                      \
        .ra_off         = -1*(ws),                      \
        .fp_off         = -2*(ws),                      \
        .use_fp         = true,

#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws)               \
        .cfa_off        =  1*(ws),                      \
        .ra_off         = -1*(ws),                      \
        .fp_off         = 0,                            \
        .use_fp         = false,

static inline bool unwind_user_at_function_start(struct pt_regs *regs)
{
        return is_uprobe_at_func_entry(regs);
}
#define unwind_user_at_function_start unwind_user_at_function_start

#endif /* CONFIG_HAVE_UNWIND_USER_FP */

#endif /* _ASM_X86_UNWIND_USER_H */