diff options
Diffstat (limited to 'tools/include/nolibc/compiler.h')
| -rw-r--r-- | tools/include/nolibc/compiler.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/tools/include/nolibc/compiler.h b/tools/include/nolibc/compiler.h new file mode 100644 index 000000000..f2d7a81d0 --- /dev/null +++ b/tools/include/nolibc/compiler.h @@ -0,0 +1,93 @@ +/* SPDX-License-Identifier: LGPL-2.1 OR MIT */ +/* + * NOLIBC compiler support header + * Copyright (C) 2023 Thomas Weißschuh <linux@weissschuh.net> + */ +#ifndef _NOLIBC_COMPILER_H +#define _NOLIBC_COMPILER_H + +#if defined(__has_attribute) +# define __nolibc_has_attribute(attr) __has_attribute(attr) +#else +# define __nolibc_has_attribute(attr) 0 +#endif + +#if defined(__has_feature) +# define __nolibc_has_feature(feature) __has_feature(feature) +#else +# define __nolibc_has_feature(feature) 0 +#endif + +#define __nolibc_aligned(alignment) __attribute__((aligned(alignment))) +#define __nolibc_aligned_as(type) __nolibc_aligned(__alignof__(type)) + +#if __nolibc_has_attribute(naked) +# define __nolibc_entrypoint __attribute__((naked)) +# define __nolibc_entrypoint_epilogue() +#else +# define __nolibc_entrypoint __attribute__((optimize("Os", "omit-frame-pointer"))) +# define __nolibc_entrypoint_epilogue() __builtin_unreachable() +#endif /* __nolibc_has_attribute(naked) */ + +#if defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__) || defined(__SSP_EXPLICIT__) + +#define _NOLIBC_STACKPROTECTOR + +#endif /* defined(__SSP__) ... */ + +#if __nolibc_has_attribute(no_stack_protector) +# define __nolibc_no_stack_protector __attribute__((no_stack_protector)) +#else +# define __nolibc_no_stack_protector __attribute__((__optimize__("-fno-stack-protector"))) +#endif /* __nolibc_has_attribute(no_stack_protector) */ + +#if __nolibc_has_attribute(__fallthrough__) +# define __nolibc_fallthrough do { } while (0); __attribute__((__fallthrough__)) +#else +# define __nolibc_fallthrough do { } while (0) +#endif /* __nolibc_has_attribute(fallthrough) */ + +#if defined(__STDC_VERSION__) +# define __nolibc_stdc_version __STDC_VERSION__ +#else +# define __nolibc_stdc_version 0 +#endif + +#define __nolibc_version(_major, _minor, _patch) ((_major) * 10000 + (_minor) * 100 + (_patch)) + +#ifdef __GNUC__ +# define __nolibc_gnuc_version \ + __nolibc_version(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) +#else +# define __nolibc_gnuc_version 0 +#endif /* __GNUC__ */ + +#ifdef __clang__ +# define __nolibc_clang_version \ + __nolibc_version(__clang_major__, __clang_minor__, __clang_patchlevel__) +#else +# define __nolibc_clang_version 0 +#endif /* __clang__ */ + +#if __nolibc_stdc_version >= 201112L || \ + __nolibc_gnuc_version >= __nolibc_version(4, 6, 0) || \ + __nolibc_clang_version >= __nolibc_version(3, 0, 0) +# define __nolibc_static_assert(_t) _Static_assert(_t, "") +#else +# define __nolibc_static_assert(_t) +#endif + +/* Make the optimizer believe the variable can be manipulated arbitrarily. */ +#define _NOLIBC_OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "+r" (var)) + +#if __nolibc_has_feature(undefined_behavior_sanitizer) +# if defined(__clang__) +# define __nolibc_no_sanitize_undefined __attribute__((no_sanitize("function"))) +# else +# define __nolibc_no_sanitize_undefined __attribute__((no_sanitize_undefined)) +# endif +#else +# define __nolibc_no_sanitize_undefined +#endif + +#endif /* _NOLIBC_COMPILER_H */ |