| 1 |
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| 2 | |
| 3 | * NOLIBC compiler support header
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| 4 | * Copyright (C) 2023 Thomas Weißschuh <[email protected]>
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| 5 |
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| 6 | #ifndef _NOLIBC_COMPILER_H
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| 7 | #define _NOLIBC_COMPILER_H
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| 8 |
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| 9 | #if defined(__has_attribute)
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| 10 | # define __nolibc_has_attribute(attr) __has_attribute(attr)
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| 11 | #else
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| 12 | # define __nolibc_has_attribute(attr) 0
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| 13 | #endif
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| 14 |
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| 15 | #if defined(__has_feature)
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| 16 | # define __nolibc_has_feature(feature) __has_feature(feature)
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| 17 | #else
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| 18 | # define __nolibc_has_feature(feature) 0
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| 19 | #endif
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| 20 |
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| 21 | #define __nolibc_aligned(alignment) __attribute__((aligned(alignment)))
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| 22 | #define __nolibc_aligned_as(type) __nolibc_aligned(__alignof__(type))
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| 23 |
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| 24 | #if __nolibc_has_attribute(naked)
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| 25 | # define __nolibc_entrypoint __attribute__((naked))
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| 26 | # define __nolibc_entrypoint_epilogue()
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| 27 | #else
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| 28 | # define __nolibc_entrypoint __attribute__((optimize("Os", "omit-frame-pointer")))
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| 29 | # define __nolibc_entrypoint_epilogue() __builtin_unreachable()
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| 30 | #endif
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| 31 |
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| 32 | #if defined(__SSP__) || defined(__SSP_STRONG__) || defined(__SSP_ALL__) || defined(__SSP_EXPLICIT__)
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| 33 |
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| 34 | #define _NOLIBC_STACKPROTECTOR
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| 35 |
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| 36 | #endif
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| 37 |
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| 38 | #if __nolibc_has_attribute(no_stack_protector)
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| 39 | # define __nolibc_no_stack_protector __attribute__((no_stack_protector))
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| 40 | #else
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| 41 | # define __nolibc_no_stack_protector __attribute__((__optimize__("-fno-stack-protector")))
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| 42 | #endif
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| 43 |
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| 44 | #if __nolibc_has_attribute(__fallthrough__)
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| 45 | # define __nolibc_fallthrough do { } while (0); __attribute__((__fallthrough__))
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| 46 | #else
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| 47 | # define __nolibc_fallthrough do { } while (0)
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| 48 | #endif
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| 49 |
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| 50 | #if defined(__STDC_VERSION__)
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| 51 | # define __nolibc_stdc_version __STDC_VERSION__
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| 52 | #else
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| 53 | # define __nolibc_stdc_version 0
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| 54 | #endif
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| 55 |
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| 56 | #define __nolibc_version(_major, _minor, _patch) ((_major) * 10000 + (_minor) * 100 + (_patch))
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| 57 |
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| 58 | #ifdef __GNUC__
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| 59 | # define __nolibc_gnuc_version \
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| 60 | __nolibc_version(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
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| 61 | #else
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| 62 | # define __nolibc_gnuc_version 0
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| 63 | #endif
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| 64 |
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| 65 | #ifdef __clang__
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| 66 | # define __nolibc_clang_version \
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| 67 | __nolibc_version(__clang_major__, __clang_minor__, __clang_patchlevel__)
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| 68 | #else
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| 69 | # define __nolibc_clang_version 0
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| 70 | #endif
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| 71 |
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| 72 | #if __nolibc_stdc_version >= 201112L || \
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| 73 | __nolibc_gnuc_version >= __nolibc_version(4, 6, 0) || \
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| 74 | __nolibc_clang_version >= __nolibc_version(3, 0, 0)
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| 75 | # define __nolibc_static_assert(_t) _Static_assert(_t, "")
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| 76 | #else
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| 77 | # define __nolibc_static_assert(_t)
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| 78 | #endif
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| 79 |
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| 80 |
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| 81 | #define _NOLIBC_OPTIMIZER_HIDE_VAR(var) __asm__ ("" : "+r" (var))
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| 82 |
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| 83 | #if __nolibc_has_feature(undefined_behavior_sanitizer)
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| 84 | # if defined(__clang__)
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| 85 | # define __nolibc_no_sanitize_undefined __attribute__((no_sanitize("function")))
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| 86 | # else
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| 87 | # define __nolibc_no_sanitize_undefined __attribute__((no_sanitize_undefined))
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| 88 | # endif
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| 89 | #else
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| 90 | # define __nolibc_no_sanitize_undefined
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| 91 | #endif
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| 92 |
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| 93 | |
| 94 | * Helper for 32-bit machines where a 64-bit syscall arg needs to be split into
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| 95 | * two 32-bit parts while making sure the order of the low/high parts are correct
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| 96 | * for the endianness:
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| 97 | * __NOLIBC_LLARGPART(x, 0), __NOLIBC_LLARGPART(x, 1)
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| 98 |
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| 99 | #define __NOLIBC_LLARGPART(_arg, _part) \
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| 100 | (((union { long long ll; long l[2]; }) { .ll = _arg }).l[_part])
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| 101 |
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| 102 | #endif
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