helpers.h

 1// SPDX-License-Identifier: GPL-2.0-only
 2#ifndef __SELFTESTS_X86_HELPERS_H
 3#define __SELFTESTS_X86_HELPERS_H
 4
 5#include <signal.h>
 6#include <string.h>
 7
 8#include <asm/processor-flags.h>
 9
10#include "kselftest.h"
11
12static inline unsigned long get_eflags(void)
13{
14#ifdef __x86_64__
15	return __builtin_ia32_readeflags_u64();
16#else
17	return __builtin_ia32_readeflags_u32();
18#endif
19}
20
21static inline void set_eflags(unsigned long eflags)
22{
23#ifdef __x86_64__
24	__builtin_ia32_writeeflags_u64(eflags);
25#else
26	__builtin_ia32_writeeflags_u32(eflags);
27#endif
28}
29
30static inline void sethandler(int sig, void (*handler)(int, siginfo_t *, void *), int flags)
31{
32	struct sigaction sa;
33
34	memset(&sa, 0, sizeof(sa));
35	sa.sa_sigaction = handler;
36	sa.sa_flags = SA_SIGINFO | flags;
37	sigemptyset(&sa.sa_mask);
38	if (sigaction(sig, &sa, 0))
39		ksft_exit_fail_msg("sigaction failed");
40}
41
42static inline void clearhandler(int sig)
43{
44	struct sigaction sa;
45
46	memset(&sa, 0, sizeof(sa));
47	sa.sa_handler = SIG_DFL;
48	sigemptyset(&sa.sa_mask);
49	if (sigaction(sig, &sa, 0))
50		ksft_exit_fail_msg("sigaction failed");
51}
52
53#endif /* __SELFTESTS_X86_HELPERS_H */