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1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * NOLIBC compiler support header
4 * Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net>
5 */
6#ifndef _NOLIBC_COMPILER_H
7#define _NOLIBC_COMPILER_H
8
9#if defined(__has_attribute)
10# define __nolibc_has_attribute(attr) __has_attribute(attr)
11#else
12# define __nolibc_has_attribute(attr) 0
13#endif
14
15#if defined(__has_feature)
16# define __nolibc_has_feature(feature) __has_feature(feature)
17#else
18# define __nolibc_has_feature(feature) 0
19#endif
20
21#define __nolibc_aligned(alignment) __attribute__((aligned(alignment)))
22#define __nolibc_aligned_as(type) __nolibc_aligned(__alignof__(type))
23
24#if __nolibc_has_attribute(naked)
25# define __nolibc_entrypoint __attribute__((naked))
26# define __nolibc_entrypoint_epilogue()
27#else
28# define __nolibc_entrypoint __attribute__((optimize("Os", "omit-frame-pointer")))
29# define __nolibc_entrypoint_epilogue() __builtin_unreachable()
30#endif /* __nolibc_has_attribute(naked) */
31
32#if defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__) || defined(__SSP_EXPLICIT__)
33
34#define _NOLIBC_STACKPROTECTOR
35
36#endif /* defined(__SSP__) ... */
37
38#if __nolibc_has_attribute(no_stack_protector)
39# define __no_stack_protector __attribute__((no_stack_protector))
40#else
41# define __no_stack_protector __attribute__((__optimize__("-fno-stack-protector")))
42#endif /* __nolibc_has_attribute(no_stack_protector) */
43
44#if __nolibc_has_attribute(__fallthrough__)
45# define __nolibc_fallthrough do { } while (0); __attribute__((__fallthrough__))
46#else
47# define __nolibc_fallthrough do { } while (0)
48#endif /* __nolibc_has_attribute(fallthrough) */
49
50#define __nolibc_version(_major, _minor, _patch) ((_major) * 10000 + (_minor) * 100 + (_patch))
51
52#ifdef __GNUC__
53# define __nolibc_gnuc_version \
54 __nolibc_version(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
55#else
56# define __nolibc_gnuc_version 0
57#endif /* __GNUC__ */
58
59#ifdef __clang__
60# define __nolibc_clang_version \
61 __nolibc_version(__clang_major__, __clang_minor__, __clang_patchlevel__)
62#else
63# define __nolibc_clang_version 0
64#endif /* __clang__ */
65
66#if __STDC_VERSION__ >= 201112L || \
67 __nolibc_gnuc_version >= __nolibc_version(4, 6, 0) || \
68 __nolibc_clang_version >= __nolibc_version(3, 0, 0)
69# define __nolibc_static_assert(_t) _Static_assert(_t, "")
70#else
71# define __nolibc_static_assert(_t)
72#endif
73
74#endif /* _NOLIBC_COMPILER_H */