| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __LINUX_COMPILER_TYPES_H |
| 3 | #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." |
| 4 | #endif |
| 5 | |
| 6 | /* |
| 7 | * Common definitions for all gcc versions go here. |
| 8 | */ |
| 9 | #define GCC_VERSION (__GNUC__ * 10000 \ |
| 10 | + __GNUC_MINOR__ * 100 \ |
| 11 | + __GNUC_PATCHLEVEL__) |
| 12 | |
| 13 | /* |
| 14 | * This macro obfuscates arithmetic on a variable address so that gcc |
| 15 | * shouldn't recognize the original var, and make assumptions about it. |
| 16 | * |
| 17 | * This is needed because the C standard makes it undefined to do |
| 18 | * pointer arithmetic on "objects" outside their boundaries and the |
| 19 | * gcc optimizers assume this is the case. In particular they |
| 20 | * assume such arithmetic does not wrap. |
| 21 | * |
| 22 | * A miscompilation has been observed because of this on PPC. |
| 23 | * To work around it we hide the relationship of the pointer and the object |
| 24 | * using this macro. |
| 25 | * |
| 26 | * Versions of the ppc64 compiler before 4.1 had a bug where use of |
| 27 | * RELOC_HIDE could trash r30. The bug can be worked around by changing |
| 28 | * the inline assembly constraint from =g to =r, in this particular |
| 29 | * case either is valid. |
| 30 | */ |
| 31 | #define RELOC_HIDE(ptr, off) \ |
| 32 | ({ \ |
| 33 | unsigned long __ptr; \ |
| 34 | __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ |
| 35 | (typeof(ptr)) (__ptr + (off)); \ |
| 36 | }) |
| 37 | |
| 38 | #ifdef CONFIG_MITIGATION_RETPOLINE |
| 39 | #define __noretpoline __attribute__((__indirect_branch__("keep"))) |
| 40 | #endif |
| 41 | |
| 42 | #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__) |
| 43 | #define __latent_entropy __attribute__((latent_entropy)) |
| 44 | #endif |
| 45 | |
| 46 | /* |
| 47 | * calling noreturn functions, __builtin_unreachable() and __builtin_trap() |
| 48 | * confuse the stack allocation in gcc, leading to overly large stack |
| 49 | * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365 |
| 50 | * |
| 51 | * Adding an empty inline assembly before it works around the problem |
| 52 | */ |
| 53 | #define barrier_before_unreachable() asm volatile("") |
| 54 | |
| 55 | /* |
| 56 | * Mark a position in code as unreachable. This can be used to |
| 57 | * suppress control flow warnings after asm blocks that transfer |
| 58 | * control elsewhere. |
| 59 | */ |
| 60 | #define unreachable() \ |
| 61 | do { \ |
| 62 | annotate_unreachable(); \ |
| 63 | barrier_before_unreachable(); \ |
| 64 | __builtin_unreachable(); \ |
| 65 | } while (0) |
| 66 | |
| 67 | #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) |
| 68 | #define __HAVE_BUILTIN_BSWAP32__ |
| 69 | #define __HAVE_BUILTIN_BSWAP64__ |
| 70 | #define __HAVE_BUILTIN_BSWAP16__ |
| 71 | #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |
| 72 | |
| 73 | #if GCC_VERSION >= 70000 |
| 74 | #define KASAN_ABI_VERSION 5 |
| 75 | #else |
| 76 | #define KASAN_ABI_VERSION 4 |
| 77 | #endif |
| 78 | |
| 79 | #ifdef CONFIG_SHADOW_CALL_STACK |
| 80 | #define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) |
| 81 | #endif |
| 82 | |
| 83 | #define __no_sanitize_address __attribute__((__no_sanitize_address__)) |
| 84 | |
| 85 | #if defined(__SANITIZE_THREAD__) |
| 86 | #define __no_sanitize_thread __attribute__((__no_sanitize_thread__)) |
| 87 | #else |
| 88 | #define __no_sanitize_thread |
| 89 | #endif |
| 90 | |
| 91 | #define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__)) |
| 92 | |
| 93 | /* |
| 94 | * Only supported since gcc >= 12 |
| 95 | */ |
| 96 | #if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__) |
| 97 | #define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__)) |
| 98 | #else |
| 99 | #define __no_sanitize_coverage |
| 100 | #endif |
| 101 | |
| 102 | /* |
| 103 | * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel, |
| 104 | * matching the defines used by Clang. |
| 105 | */ |
| 106 | #ifdef __SANITIZE_HWADDRESS__ |
| 107 | #define __SANITIZE_ADDRESS__ |
| 108 | #endif |
| 109 | |
| 110 | /* |
| 111 | * GCC does not support KMSAN. |
| 112 | */ |
| 113 | #define __no_sanitize_memory |
| 114 | #define __no_kmsan_checks |
| 115 | |
| 116 | /* |
| 117 | * Turn individual warnings and errors on and off locally, depending |
| 118 | * on version. |
| 119 | */ |
| 120 | #define __diag_GCC(version, severity, s) \ |
| 121 | __diag_GCC_ ## version(__diag_GCC_ ## severity s) |
| 122 | |
| 123 | /* Severity used in pragma directives */ |
| 124 | #define __diag_GCC_ignore ignored |
| 125 | #define __diag_GCC_warn warning |
| 126 | #define __diag_GCC_error error |
| 127 | |
| 128 | #define __diag_str1(s) #s |
| 129 | #define __diag_str(s) __diag_str1(s) |
| 130 | #define __diag(s) _Pragma(__diag_str(GCC diagnostic s)) |
| 131 | |
| 132 | #if GCC_VERSION >= 80000 |
| 133 | #define __diag_GCC_8(s) __diag(s) |
| 134 | #else |
| 135 | #define __diag_GCC_8(s) |
| 136 | #endif |
| 137 | |
| 138 | #define __diag_ignore_all(option, comment) \ |
| 139 | __diag(__diag_GCC_ignore option) |
| 140 | |
| 141 | /* |
| 142 | * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size" |
| 143 | * attribute) do not work, and must be disabled. |
| 144 | */ |
| 145 | #if GCC_VERSION < 90100 |
| 146 | #undef __alloc_size__ |
| 147 | #endif |