unwind_user.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_UNWIND_USER_H
 3#define _ASM_X86_UNWIND_USER_H
 4
 5#ifdef CONFIG_HAVE_UNWIND_USER_FP
 6
 7#include <asm/ptrace.h>
 8#include <asm/uprobes.h>
 9
10#define ARCH_INIT_USER_FP_FRAME(ws)			\
11	.cfa_off	=  2*(ws),			\
12	.ra_off		= -1*(ws),			\
13	.fp_off		= -2*(ws),			\
14	.use_fp		= true,
15
16#define ARCH_INIT_USER_FP_ENTRY_FRAME(ws)		\
17	.cfa_off	=  1*(ws),			\
18	.ra_off		= -1*(ws),			\
19	.fp_off		= 0,				\
20	.use_fp		= false,
21
22static inline int unwind_user_word_size(struct pt_regs *regs)
23{
24	/* We can't unwind VM86 stacks */
25	if (regs->flags & X86_VM_MASK)
26		return 0;
27#ifdef CONFIG_X86_64
28	if (!user_64bit_mode(regs))
29		return sizeof(int);
30#endif
31	return sizeof(long);
32}
33
34static inline bool unwind_user_at_function_start(struct pt_regs *regs)
35{
36	return is_uprobe_at_func_entry(regs);
37}
38
39#endif /* CONFIG_HAVE_UNWIND_USER_FP */
40
41#endif /* _ASM_X86_UNWIND_USER_H */