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 #if defined(CONFIG_ENABLE_MUST_CHECK) && !defined(__GENKSYMS__) 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 * Force always-inline if the user requests it so via the .config. 137 * Prefer gnu_inline, so that extern inline functions do not emit an 138 * externally visible function. This makes extern inline behave as per gnu89 139 * semantics rather than c99. This prevents multiple symbol definition errors 140 * of extern inline functions at link time. 141 * A lot of inline functions can cause havoc with function tracing. 142 * Do not use __always_inline here, since currently it expands to inline again 143 * (which would break users of __always_inline). 144 */ 145 #if !defined(CONFIG_OPTIMIZE_INLINING) 146 #define inline inline __attribute__((__always_inline__)) __gnu_inline \ 147 __inline_maybe_unused notrace 148 #else 149 #define inline inline __gnu_inline \ 150 __inline_maybe_unused notrace 151 #endif 152 153 /* 154 * gcc provides both __inline__ and __inline as alternate spellings of 155 * the inline keyword, though the latter is undocumented. New kernel 156 * code should only use the inline spelling, but some existing code 157 * uses __inline__. Since we #define inline above, to ensure 158 * __inline__ has the same semantics, we need this #define. 159 * 160 * However, the spelling __inline is strictly reserved for referring 161 * to the bare keyword. 162 */ 163 #define __inline__ inline 164 165 /* 166 * GCC does not warn about unused static inline functions for -Wunused-function. 167 * Suppress the warning in clang as well by using __maybe_unused, but enable it 168 * for W=1 build. This will allow clang to find unused functions. Remove the 169 * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings. 170 */ 171 #ifdef KBUILD_EXTRA_WARN1 172 #define __inline_maybe_unused 173 #else 174 #define __inline_maybe_unused __maybe_unused 175 #endif 176 177 /* 178 * Rather then using noinline to prevent stack consumption, use 179 * noinline_for_stack instead. For documentation reasons. 180 */ 181 #define noinline_for_stack noinline 182 183 #endif /* __KERNEL__ */ 184 185 #endif /* __ASSEMBLY__ */ 186 187 /* 188 * The below symbols may be defined for one or more, but not ALL, of the above 189 * compilers. We don't consider that to be an error, so set them to nothing. 190 * For example, some of them are for compiler specific plugins. 191 */ 192 #ifndef __latent_entropy 193 # define __latent_entropy 194 #endif 195 196 #ifndef __randomize_layout 197 # define __randomize_layout __designated_init 198 #endif 199 200 #ifndef __no_randomize_layout 201 # define __no_randomize_layout 202 #endif 203 204 #ifndef randomized_struct_fields_start 205 # define randomized_struct_fields_start 206 # define randomized_struct_fields_end 207 #endif 208 209 #ifndef __noscs 210 # define __noscs 211 #endif 212 213 #ifndef __norecordmcount 214 # define __norecordmcount 215 #endif 216 217 #ifndef __nocfi 218 # define __nocfi 219 #endif 220 221 #ifndef asm_volatile_goto 222 #define asm_volatile_goto(x...) asm goto(x) 223 #endif 224 225 #ifdef CONFIG_CC_HAS_ASM_INLINE 226 #define asm_inline asm __inline 227 #else 228 #define asm_inline asm 229 #endif 230 231 /* Are two types/vars the same type (ignoring qualifiers)? */ 232 #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) 233 234 /* Is this type a native word size -- useful for atomic operations */ 235 #define __native_word(t) \ 236 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ 237 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) 238 239 /* Helpers for emitting diagnostics in pragmas. */ 240 #ifndef __diag 241 #define __diag(string) 242 #endif 243 244 #ifndef __diag_GCC 245 #define __diag_GCC(version, severity, string) 246 #endif 247 248 #define __diag_push() __diag(push) 249 #define __diag_pop() __diag(pop) 250 251 #define __diag_ignore(compiler, version, option, comment) \ 252 __diag_ ## compiler(version, ignore, option) 253 #define __diag_warn(compiler, version, option, comment) \ 254 __diag_ ## compiler(version, warn, option) 255 #define __diag_error(compiler, version, option, comment) \ 256 __diag_ ## compiler(version, error, option) 257 258 #endif /* __LINUX_COMPILER_TYPES_H */ 259