1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_COMPILER_TYPES_H 3 #error "Please do not 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 #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__) 39 #define __latent_entropy __attribute__((latent_entropy)) 40 #endif 41 42 /* 43 * calling noreturn functions, __builtin_unreachable() and __builtin_trap() 44 * confuse the stack allocation in gcc, leading to overly large stack 45 * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365 46 * 47 * Adding an empty inline assembly before it works around the problem 48 */ 49 #define barrier_before_unreachable() asm volatile("") 50 51 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 52 #define __HAVE_BUILTIN_BSWAP32__ 53 #define __HAVE_BUILTIN_BSWAP64__ 54 #define __HAVE_BUILTIN_BSWAP16__ 55 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 56 57 #if GCC_VERSION >= 70000 58 #define KASAN_ABI_VERSION 5 59 #else 60 #define KASAN_ABI_VERSION 4 61 #endif 62 63 #ifdef CONFIG_SHADOW_CALL_STACK 64 #define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) 65 #endif 66 67 #ifdef __SANITIZE_HWADDRESS__ 68 #define __no_sanitize_address __attribute__((__no_sanitize__("hwaddress"))) 69 #else 70 #define __no_sanitize_address __attribute__((__no_sanitize_address__)) 71 #endif 72 73 #if defined(__SANITIZE_THREAD__) 74 #define __no_sanitize_thread __attribute__((__no_sanitize_thread__)) 75 #else 76 #define __no_sanitize_thread 77 #endif 78 79 #define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__)) 80 81 /* 82 * Only supported since gcc >= 12 83 */ 84 #if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__) 85 #define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__)) 86 #else 87 #define __no_sanitize_coverage 88 #endif 89 90 /* 91 * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel, 92 * matching the defines used by Clang. 93 */ 94 #ifdef __SANITIZE_HWADDRESS__ 95 #define __SANITIZE_ADDRESS__ 96 #endif 97 98 /* 99 * GCC does not support KMSAN. 100 */ 101 #define __no_sanitize_memory 102 #define __no_kmsan_checks 103 104 /* 105 * Turn individual warnings and errors on and off locally, depending 106 * on version. 107 */ 108 #define __diag_GCC(version, severity, s) \ 109 __diag_GCC_ ## version(__diag_GCC_ ## severity s) 110 111 /* Severity used in pragma directives */ 112 #define __diag_GCC_ignore ignored 113 #define __diag_GCC_warn warning 114 #define __diag_GCC_error error 115 116 #define __diag_str1(s) #s 117 #define __diag_str(s) __diag_str1(s) 118 #define __diag(s) _Pragma(__diag_str(GCC diagnostic s)) 119 120 #if GCC_VERSION >= 80000 121 #define __diag_GCC_8(s) __diag(s) 122 #else 123 #define __diag_GCC_8(s) 124 #endif 125 126 #define __diag_GCC_all(s) __diag(s) 127 128 #define __diag_ignore_all(option, comment) \ 129 __diag(__diag_GCC_ignore option) 130 131 /* 132 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size" 133 * attribute) do not work, and must be disabled. 134 */ 135 #if GCC_VERSION < 90100 136 #undef __alloc_size__ 137 #endif 138 139 /* 140 * Declare compiler support for __typeof_unqual__() operator. 141 * 142 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot 143 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL. 144 */ 145 #define CC_HAS_TYPEOF_UNQUAL (__GNUC__ >= 14) 146