1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_COMPILER_TYPES_H 3 #define __LINUX_COMPILER_TYPES_H 4 5 #ifndef __ASSEMBLY__ 6 7 #ifdef __CHECKER__ 8 # define __user __attribute__((noderef, address_space(1))) 9 # define __kernel __attribute__((address_space(0))) 10 # define __safe __attribute__((safe)) 11 # define __force __attribute__((force)) 12 # define __nocast __attribute__((nocast)) 13 # define __iomem __attribute__((noderef, address_space(2))) 14 # define __must_hold(x) __attribute__((context(x,1,1))) 15 # define __acquires(x) __attribute__((context(x,0,1))) 16 # define __releases(x) __attribute__((context(x,1,0))) 17 # define __acquire(x) __context__(x,1) 18 # define __release(x) __context__(x,-1) 19 # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) 20 # define __percpu __attribute__((noderef, address_space(3))) 21 # define __rcu __attribute__((noderef, address_space(4))) 22 # define __private __attribute__((noderef)) 23 extern void __chk_user_ptr(const volatile void __user *); 24 extern void __chk_io_ptr(const volatile void __iomem *); 25 # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member)) 26 #else /* __CHECKER__ */ 27 # ifdef STRUCTLEAK_PLUGIN 28 # define __user __attribute__((user)) 29 # else 30 # define __user 31 # endif 32 # define __kernel 33 # define __safe 34 # define __force 35 # define __nocast 36 # define __iomem 37 # define __chk_user_ptr(x) (void)0 38 # define __chk_io_ptr(x) (void)0 39 # define __builtin_warning(x, y...) (1) 40 # define __must_hold(x) 41 # define __acquires(x) 42 # define __releases(x) 43 # define __acquire(x) (void)0 44 # define __release(x) (void)0 45 # define __cond_lock(x,c) (c) 46 # define __percpu 47 # define __rcu 48 # define __private 49 # define ACCESS_PRIVATE(p, member) ((p)->member) 50 #endif /* __CHECKER__ */ 51 52 /* Indirect macros required for expanded argument pasting, eg. __LINE__. */ 53 #define ___PASTE(a,b) a##b 54 #define __PASTE(a,b) ___PASTE(a,b) 55 56 #ifdef __KERNEL__ 57 58 /* Attributes */ 59 #include <linux/compiler_attributes.h> 60 61 /* Compiler specific macros. */ 62 #ifdef __clang__ 63 #include <linux/compiler-clang.h> 64 #elif defined(__INTEL_COMPILER) 65 #include <linux/compiler-intel.h> 66 #elif defined(__GNUC__) 67 /* The above compilers also define __GNUC__, so order is important here. */ 68 #include <linux/compiler-gcc.h> 69 #else 70 #error "Unknown compiler" 71 #endif 72 73 /* 74 * Some architectures need to provide custom definitions of macros provided 75 * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that 76 * conditionally rather than using an asm-generic wrapper in order to avoid 77 * build failures if any C compilation, which will include this file via an 78 * -include argument in c_flags, occurs prior to the asm-generic wrappers being 79 * generated. 80 */ 81 #ifdef CONFIG_HAVE_ARCH_COMPILER_H 82 #include <asm/compiler.h> 83 #endif 84 85 struct ftrace_branch_data { 86 const char *func; 87 const char *file; 88 unsigned line; 89 union { 90 struct { 91 unsigned long correct; 92 unsigned long incorrect; 93 }; 94 struct { 95 unsigned long miss; 96 unsigned long hit; 97 }; 98 unsigned long miss_hit[2]; 99 }; 100 }; 101 102 struct ftrace_likely_data { 103 struct ftrace_branch_data data; 104 unsigned long constant; 105 }; 106 107 #ifdef CONFIG_ENABLE_MUST_CHECK 108 #define __must_check __attribute__((__warn_unused_result__)) 109 #else 110 #define __must_check 111 #endif 112 113 #if defined(CC_USING_HOTPATCH) 114 #define notrace __attribute__((hotpatch(0, 0))) 115 #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY) 116 #define notrace __attribute__((patchable_function_entry(0, 0))) 117 #else 118 #define notrace __attribute__((__no_instrument_function__)) 119 #endif 120 121 /* Section for code which can't be instrumented at all */ 122 #define noinstr \ 123 noinline notrace __attribute((__section__(".noinstr.text"))) 124 125 /* 126 * it doesn't make sense on ARM (currently the only user of __naked) 127 * to trace naked functions because then mcount is called without 128 * stack and frame pointer being set up and there is no chance to 129 * restore the lr register to the value before mcount was called. 130 */ 131 #define __naked __attribute__((__naked__)) notrace 132 133 #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) 134 135 /* 136 * Prefer gnu_inline, so that extern inline functions do not emit an 137 * externally visible function. This makes extern inline behave as per gnu89 138 * semantics rather than c99. This prevents multiple symbol definition errors 139 * of extern inline functions at link time. 140 * A lot of inline functions can cause havoc with function tracing. 141 */ 142 #define inline inline __gnu_inline __inline_maybe_unused notrace 143 144 /* 145 * gcc provides both __inline__ and __inline as alternate spellings of 146 * the inline keyword, though the latter is undocumented. New kernel 147 * code should only use the inline spelling, but some existing code 148 * uses __inline__. Since we #define inline above, to ensure 149 * __inline__ has the same semantics, we need this #define. 150 * 151 * However, the spelling __inline is strictly reserved for referring 152 * to the bare keyword. 153 */ 154 #define __inline__ inline 155 156 /* 157 * GCC does not warn about unused static inline functions for -Wunused-function. 158 * Suppress the warning in clang as well by using __maybe_unused, but enable it 159 * for W=1 build. This will allow clang to find unused functions. Remove the 160 * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings. 161 */ 162 #ifdef KBUILD_EXTRA_WARN1 163 #define __inline_maybe_unused 164 #else 165 #define __inline_maybe_unused __maybe_unused 166 #endif 167 168 /* 169 * Rather then using noinline to prevent stack consumption, use 170 * noinline_for_stack instead. For documentation reasons. 171 */ 172 #define noinline_for_stack noinline 173 174 /* 175 * Sanitizer helper attributes: Because using __always_inline and 176 * __no_sanitize_* conflict, provide helper attributes that will either expand 177 * to __no_sanitize_* in compilation units where instrumentation is enabled 178 * (__SANITIZE_*__), or __always_inline in compilation units without 179 * instrumentation (__SANITIZE_*__ undefined). 180 */ 181 #ifdef __SANITIZE_ADDRESS__ 182 /* 183 * We can't declare function 'inline' because __no_sanitize_address conflicts 184 * with inlining. Attempt to inline it may cause a build failure. 185 * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 186 * '__maybe_unused' allows us to avoid defined-but-not-used warnings. 187 */ 188 # define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused 189 # define __no_sanitize_or_inline __no_kasan_or_inline 190 #else 191 # define __no_kasan_or_inline __always_inline 192 #endif 193 194 #define __no_kcsan __no_sanitize_thread 195 #ifdef __SANITIZE_THREAD__ 196 # define __no_kcsan_or_inline __no_kcsan notrace __maybe_unused 197 # define __no_sanitize_or_inline __no_kcsan_or_inline 198 #else 199 # define __no_kcsan_or_inline __always_inline 200 #endif 201 202 #ifndef __no_sanitize_or_inline 203 #define __no_sanitize_or_inline __always_inline 204 #endif 205 206 #endif /* __KERNEL__ */ 207 208 #endif /* __ASSEMBLY__ */ 209 210 /* 211 * The below symbols may be defined for one or more, but not ALL, of the above 212 * compilers. We don't consider that to be an error, so set them to nothing. 213 * For example, some of them are for compiler specific plugins. 214 */ 215 #ifndef __latent_entropy 216 # define __latent_entropy 217 #endif 218 219 #ifndef __randomize_layout 220 # define __randomize_layout __designated_init 221 #endif 222 223 #ifndef __no_randomize_layout 224 # define __no_randomize_layout 225 #endif 226 227 #ifndef randomized_struct_fields_start 228 # define randomized_struct_fields_start 229 # define randomized_struct_fields_end 230 #endif 231 232 #ifndef __noscs 233 # define __noscs 234 #endif 235 236 #ifndef asm_volatile_goto 237 #define asm_volatile_goto(x...) asm goto(x) 238 #endif 239 240 #ifdef CONFIG_CC_HAS_ASM_INLINE 241 #define asm_inline asm __inline 242 #else 243 #define asm_inline asm 244 #endif 245 246 #ifndef __no_fgcse 247 # define __no_fgcse 248 #endif 249 250 /* Are two types/vars the same type (ignoring qualifiers)? */ 251 #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) 252 253 /* 254 * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving 255 * non-scalar types unchanged. 256 */ 257 #if (defined(CONFIG_CC_IS_GCC) && CONFIG_GCC_VERSION < 40900) || defined(__CHECKER__) 258 /* 259 * We build this out of a couple of helper macros in a vain attempt to 260 * help you keep your lunch down while reading it. 261 */ 262 #define __pick_scalar_type(x, type, otherwise) \ 263 __builtin_choose_expr(__same_type(x, type), (type)0, otherwise) 264 265 /* 266 * 'char' is not type-compatible with either 'signed char' or 'unsigned char', 267 * so we include the naked type here as well as the signed/unsigned variants. 268 */ 269 #define __pick_integer_type(x, type, otherwise) \ 270 __pick_scalar_type(x, type, \ 271 __pick_scalar_type(x, unsigned type, \ 272 __pick_scalar_type(x, signed type, otherwise))) 273 274 #define __unqual_scalar_typeof(x) typeof( \ 275 __pick_integer_type(x, char, \ 276 __pick_integer_type(x, short, \ 277 __pick_integer_type(x, int, \ 278 __pick_integer_type(x, long, \ 279 __pick_integer_type(x, long long, x)))))) 280 #else 281 /* 282 * If supported, prefer C11 _Generic for better compile-times. As above, 'char' 283 * is not type-compatible with 'signed char', and we define a separate case. 284 */ 285 #define __scalar_type_to_expr_cases(type) \ 286 unsigned type: (unsigned type)0, \ 287 signed type: (signed type)0 288 289 #define __unqual_scalar_typeof(x) typeof( \ 290 _Generic((x), \ 291 char: (char)0, \ 292 __scalar_type_to_expr_cases(char), \ 293 __scalar_type_to_expr_cases(short), \ 294 __scalar_type_to_expr_cases(int), \ 295 __scalar_type_to_expr_cases(long), \ 296 __scalar_type_to_expr_cases(long long), \ 297 default: (x))) 298 #endif 299 300 /* Is this type a native word size -- useful for atomic operations */ 301 #define __native_word(t) \ 302 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ 303 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) 304 305 /* Helpers for emitting diagnostics in pragmas. */ 306 #ifndef __diag 307 #define __diag(string) 308 #endif 309 310 #ifndef __diag_GCC 311 #define __diag_GCC(version, severity, string) 312 #endif 313 314 #define __diag_push() __diag(push) 315 #define __diag_pop() __diag(pop) 316 317 #define __diag_ignore(compiler, version, option, comment) \ 318 __diag_ ## compiler(version, ignore, option) 319 #define __diag_warn(compiler, version, option, comment) \ 320 __diag_ ## compiler(version, warn, option) 321 #define __diag_error(compiler, version, option, comment) \ 322 __diag_ ## compiler(version, error, option) 323 324 #endif /* __LINUX_COMPILER_TYPES_H */ 325