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_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_GCC(8, 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 148