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66dbeef9 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d1515582 WD |
2 | #ifndef __LINUX_COMPILER_TYPES_H |
3 | #define __LINUX_COMPILER_TYPES_H | |
4 | ||
26dd68d2 PK |
5 | /* |
6 | * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21. | |
7 | * In the meantime, to support gcc < 10, we implement __has_builtin | |
8 | * by hand. | |
9 | */ | |
10 | #ifndef __has_builtin | |
11 | #define __has_builtin(x) (0) | |
12 | #endif | |
13 | ||
d1515582 WD |
14 | #ifndef __ASSEMBLY__ |
15 | ||
2f7ab126 MO |
16 | /* |
17 | * Skipped when running bindgen due to a libclang issue; | |
18 | * see https://github.com/rust-lang/rust-bindgen/issues/2244. | |
19 | */ | |
6789ab96 | 20 | #if defined(CONFIG_DEBUG_INFO_BTF) && defined(CONFIG_PAHOLE_HAS_BTF_TAG) && \ |
2f7ab126 | 21 | __has_attribute(btf_type_tag) && !defined(__BINDGEN__) |
6789ab96 HL |
22 | # define BTF_TYPE_TAG(value) __attribute__((btf_type_tag(#value))) |
23 | #else | |
24 | # define BTF_TYPE_TAG(value) /* nothing */ | |
25 | #endif | |
26 | ||
179fd6ba | 27 | /* sparse defines __CHECKER__; see Documentation/dev-tools/sparse.rst */ |
d1515582 | 28 | #ifdef __CHECKER__ |
25fd529c | 29 | /* address spaces */ |
d1515582 | 30 | # define __kernel __attribute__((address_space(0))) |
670d0a4b | 31 | # define __user __attribute__((noderef, address_space(__user))) |
670d0a4b | 32 | # define __iomem __attribute__((noderef, address_space(__iomem))) |
25fd529c LVO |
33 | # define __percpu __attribute__((noderef, address_space(__percpu))) |
34 | # define __rcu __attribute__((noderef, address_space(__rcu))) | |
e5fc436f LVO |
35 | static inline void __chk_user_ptr(const volatile void __user *ptr) { } |
36 | static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } | |
25fd529c | 37 | /* context/locking */ |
d1515582 WD |
38 | # define __must_hold(x) __attribute__((context(x,1,1))) |
39 | # define __acquires(x) __attribute__((context(x,0,1))) | |
4a557a5d | 40 | # define __cond_acquires(x) __attribute__((context(x,0,-1))) |
d1515582 WD |
41 | # define __releases(x) __attribute__((context(x,1,0))) |
42 | # define __acquire(x) __context__(x,1) | |
43 | # define __release(x) __context__(x,-1) | |
44 | # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) | |
25fd529c LVO |
45 | /* other */ |
46 | # define __force __attribute__((force)) | |
47 | # define __nocast __attribute__((nocast)) | |
48 | # define __safe __attribute__((safe)) | |
d1515582 | 49 | # define __private __attribute__((noderef)) |
d1515582 WD |
50 | # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member)) |
51 | #else /* __CHECKER__ */ | |
25fd529c LVO |
52 | /* address spaces */ |
53 | # define __kernel | |
d1515582 | 54 | # ifdef STRUCTLEAK_PLUGIN |
25fd529c | 55 | # define __user __attribute__((user)) |
d1515582 | 56 | # else |
6789ab96 | 57 | # define __user BTF_TYPE_TAG(user) |
d1515582 | 58 | # endif |
d1515582 | 59 | # define __iomem |
6789ab96 | 60 | # define __percpu BTF_TYPE_TAG(percpu) |
5a0f663f YS |
61 | # define __rcu BTF_TYPE_TAG(rcu) |
62 | ||
25fd529c LVO |
63 | # define __chk_user_ptr(x) (void)0 |
64 | # define __chk_io_ptr(x) (void)0 | |
65 | /* context/locking */ | |
d1515582 WD |
66 | # define __must_hold(x) |
67 | # define __acquires(x) | |
4a557a5d | 68 | # define __cond_acquires(x) |
d1515582 | 69 | # define __releases(x) |
25fd529c LVO |
70 | # define __acquire(x) (void)0 |
71 | # define __release(x) (void)0 | |
d1515582 | 72 | # define __cond_lock(x,c) (c) |
25fd529c LVO |
73 | /* other */ |
74 | # define __force | |
75 | # define __nocast | |
76 | # define __safe | |
d1515582 WD |
77 | # define __private |
78 | # define ACCESS_PRIVATE(p, member) ((p)->member) | |
25fd529c | 79 | # define __builtin_warning(x, y...) (1) |
d1515582 WD |
80 | #endif /* __CHECKER__ */ |
81 | ||
82 | /* Indirect macros required for expanded argument pasting, eg. __LINE__. */ | |
83 | #define ___PASTE(a,b) a##b | |
84 | #define __PASTE(a,b) ___PASTE(a,b) | |
85 | ||
86 | #ifdef __KERNEL__ | |
87 | ||
a3f8a30f MO |
88 | /* Attributes */ |
89 | #include <linux/compiler_attributes.h> | |
90 | ||
c27cd083 MR |
91 | #if CONFIG_FUNCTION_ALIGNMENT > 0 |
92 | #define __function_aligned __aligned(CONFIG_FUNCTION_ALIGNMENT) | |
93 | #else | |
94 | #define __function_aligned | |
95 | #endif | |
96 | ||
97 | /* | |
98 | * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-cold-function-attribute | |
99 | * gcc: https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-cold-label-attribute | |
100 | * | |
101 | * When -falign-functions=N is in use, we must avoid the cold attribute as | |
102 | * contemporary versions of GCC drop the alignment for cold functions. Worse, | |
103 | * GCC can implicitly mark callees of cold functions as cold themselves, so | |
104 | * it's not sufficient to add __function_aligned here as that will not ensure | |
105 | * that callees are correctly aligned. | |
106 | * | |
107 | * See: | |
108 | * | |
109 | * https://lore.kernel.org/lkml/Y77%2FqVgvaJidFpYt@FVFF77S0Q05N | |
110 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88345#c9 | |
111 | */ | |
112 | #if !defined(CONFIG_CC_IS_GCC) || (CONFIG_FUNCTION_ALIGNMENT == 0) | |
113 | #define __cold __attribute__((__cold__)) | |
114 | #else | |
115 | #define __cold | |
116 | #endif | |
117 | ||
7a0fd5e1 ME |
118 | /* |
119 | * On x86-64 and arm64 targets, __preserve_most changes the calling convention | |
120 | * of a function to make the code in the caller as unintrusive as possible. This | |
121 | * convention behaves identically to the C calling convention on how arguments | |
122 | * and return values are passed, but uses a different set of caller- and callee- | |
123 | * saved registers. | |
124 | * | |
125 | * The purpose is to alleviates the burden of saving and recovering a large | |
126 | * register set before and after the call in the caller. This is beneficial for | |
127 | * rarely taken slow paths, such as error-reporting functions that may be called | |
128 | * from hot paths. | |
129 | * | |
130 | * Note: This may conflict with instrumentation inserted on function entry which | |
131 | * does not use __preserve_most or equivalent convention (if in assembly). Since | |
132 | * function tracing assumes the normal C calling convention, where the attribute | |
133 | * is supported, __preserve_most implies notrace. It is recommended to restrict | |
134 | * use of the attribute to functions that should or already disable tracing. | |
135 | * | |
136 | * Optional: not supported by gcc. | |
137 | * | |
138 | * clang: https://clang.llvm.org/docs/AttributeReference.html#preserve-most | |
139 | */ | |
140 | #if __has_attribute(__preserve_most__) && (defined(CONFIG_X86_64) || defined(CONFIG_ARM64)) | |
141 | # define __preserve_most notrace __attribute__((__preserve_most__)) | |
142 | #else | |
143 | # define __preserve_most | |
144 | #endif | |
145 | ||
815f0ddb | 146 | /* Compiler specific macros. */ |
d1515582 WD |
147 | #ifdef __clang__ |
148 | #include <linux/compiler-clang.h> | |
815f0ddb ND |
149 | #elif defined(__GNUC__) |
150 | /* The above compilers also define __GNUC__, so order is important here. */ | |
151 | #include <linux/compiler-gcc.h> | |
152 | #else | |
153 | #error "Unknown compiler" | |
d1515582 WD |
154 | #endif |
155 | ||
04f264d3 PB |
156 | /* |
157 | * Some architectures need to provide custom definitions of macros provided | |
158 | * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that | |
159 | * conditionally rather than using an asm-generic wrapper in order to avoid | |
160 | * build failures if any C compilation, which will include this file via an | |
161 | * -include argument in c_flags, occurs prior to the asm-generic wrappers being | |
162 | * generated. | |
163 | */ | |
164 | #ifdef CONFIG_HAVE_ARCH_COMPILER_H | |
165 | #include <asm/compiler.h> | |
166 | #endif | |
167 | ||
d1515582 WD |
168 | struct ftrace_branch_data { |
169 | const char *func; | |
170 | const char *file; | |
171 | unsigned line; | |
172 | union { | |
173 | struct { | |
174 | unsigned long correct; | |
175 | unsigned long incorrect; | |
176 | }; | |
177 | struct { | |
178 | unsigned long miss; | |
179 | unsigned long hit; | |
180 | }; | |
181 | unsigned long miss_hit[2]; | |
182 | }; | |
183 | }; | |
184 | ||
185 | struct ftrace_likely_data { | |
186 | struct ftrace_branch_data data; | |
187 | unsigned long constant; | |
188 | }; | |
189 | ||
71391bdd XL |
190 | #if defined(CC_USING_HOTPATCH) |
191 | #define notrace __attribute__((hotpatch(0, 0))) | |
2809b392 SS |
192 | #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY) |
193 | #define notrace __attribute__((patchable_function_entry(0, 0))) | |
71391bdd XL |
194 | #else |
195 | #define notrace __attribute__((__no_instrument_function__)) | |
196 | #endif | |
197 | ||
198 | /* | |
199 | * it doesn't make sense on ARM (currently the only user of __naked) | |
200 | * to trace naked functions because then mcount is called without | |
201 | * stack and frame pointer being set up and there is no chance to | |
202 | * restore the lr register to the value before mcount was called. | |
203 | */ | |
204 | #define __naked __attribute__((__naked__)) notrace | |
205 | ||
71391bdd | 206 | /* |
71391bdd XL |
207 | * Prefer gnu_inline, so that extern inline functions do not emit an |
208 | * externally visible function. This makes extern inline behave as per gnu89 | |
209 | * semantics rather than c99. This prevents multiple symbol definition errors | |
210 | * of extern inline functions at link time. | |
211 | * A lot of inline functions can cause havoc with function tracing. | |
71391bdd | 212 | */ |
889b3c12 | 213 | #define inline inline __gnu_inline __inline_maybe_unused notrace |
71391bdd | 214 | |
c30724e9 RV |
215 | /* |
216 | * gcc provides both __inline__ and __inline as alternate spellings of | |
217 | * the inline keyword, though the latter is undocumented. New kernel | |
218 | * code should only use the inline spelling, but some existing code | |
219 | * uses __inline__. Since we #define inline above, to ensure | |
220 | * __inline__ has the same semantics, we need this #define. | |
221 | * | |
222 | * However, the spelling __inline is strictly reserved for referring | |
223 | * to the bare keyword. | |
224 | */ | |
71391bdd | 225 | #define __inline__ inline |
71391bdd | 226 | |
6863f564 MY |
227 | /* |
228 | * GCC does not warn about unused static inline functions for -Wunused-function. | |
229 | * Suppress the warning in clang as well by using __maybe_unused, but enable it | |
230 | * for W=1 build. This will allow clang to find unused functions. Remove the | |
231 | * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings. | |
232 | */ | |
233 | #ifdef KBUILD_EXTRA_WARN1 | |
234 | #define __inline_maybe_unused | |
235 | #else | |
236 | #define __inline_maybe_unused __maybe_unused | |
237 | #endif | |
238 | ||
71391bdd XL |
239 | /* |
240 | * Rather then using noinline to prevent stack consumption, use | |
241 | * noinline_for_stack instead. For documentation reasons. | |
242 | */ | |
243 | #define noinline_for_stack noinline | |
244 | ||
1f44328e ME |
245 | /* |
246 | * Sanitizer helper attributes: Because using __always_inline and | |
247 | * __no_sanitize_* conflict, provide helper attributes that will either expand | |
248 | * to __no_sanitize_* in compilation units where instrumentation is enabled | |
249 | * (__SANITIZE_*__), or __always_inline in compilation units without | |
250 | * instrumentation (__SANITIZE_*__ undefined). | |
251 | */ | |
252 | #ifdef __SANITIZE_ADDRESS__ | |
eb73876c ME |
253 | /* |
254 | * We can't declare function 'inline' because __no_sanitize_address conflicts | |
255 | * with inlining. Attempt to inline it may cause a build failure. | |
256 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 | |
257 | * '__maybe_unused' allows us to avoid defined-but-not-used warnings. | |
258 | */ | |
259 | # define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused | |
260 | # define __no_sanitize_or_inline __no_kasan_or_inline | |
261 | #else | |
262 | # define __no_kasan_or_inline __always_inline | |
263 | #endif | |
264 | ||
eb73876c | 265 | #ifdef __SANITIZE_THREAD__ |
bd3d5bd1 ME |
266 | /* |
267 | * Clang still emits instrumentation for __tsan_func_{entry,exit}() and builtin | |
268 | * atomics even with __no_sanitize_thread (to avoid false positives in userspace | |
269 | * ThreadSanitizer). The kernel's requirements are stricter and we really do not | |
270 | * want any instrumentation with __no_kcsan. | |
271 | * | |
272 | * Therefore we add __disable_sanitizer_instrumentation where available to | |
273 | * disable all instrumentation. See Kconfig.kcsan where this is mandatory. | |
274 | */ | |
275 | # define __no_kcsan __no_sanitize_thread __disable_sanitizer_instrumentation | |
e79302ae | 276 | # define __no_sanitize_or_inline __no_kcsan notrace __maybe_unused |
bd3d5bd1 ME |
277 | #else |
278 | # define __no_kcsan | |
eb73876c ME |
279 | #endif |
280 | ||
281 | #ifndef __no_sanitize_or_inline | |
282 | #define __no_sanitize_or_inline __always_inline | |
283 | #endif | |
284 | ||
5ddbc408 | 285 | /* Section for code which can't be instrumented at all */ |
2b5a0e42 PZ |
286 | #define __noinstr_section(section) \ |
287 | noinline notrace __attribute((__section__(section))) \ | |
5de0ce85 AP |
288 | __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \ |
289 | __no_sanitize_memory | |
5ddbc408 | 290 | |
2b5a0e42 PZ |
291 | #define noinstr __noinstr_section(".noinstr.text") |
292 | ||
0e985e9d PZ |
293 | /* |
294 | * The __cpuidle section is used twofold: | |
295 | * | |
296 | * 1) the original use -- identifying if a CPU is 'stuck' in idle state based | |
297 | * on it's instruction pointer. See cpu_in_idle(). | |
298 | * | |
299 | * 2) supressing instrumentation around where cpuidle disables RCU; where the | |
300 | * function isn't strictly required for #1, this is interchangeable with | |
301 | * noinstr. | |
302 | */ | |
2b5a0e42 PZ |
303 | #define __cpuidle __noinstr_section(".cpuidle.text") |
304 | ||
d1515582 WD |
305 | #endif /* __KERNEL__ */ |
306 | ||
815f0ddb ND |
307 | #endif /* __ASSEMBLY__ */ |
308 | ||
d1515582 | 309 | /* |
815f0ddb ND |
310 | * The below symbols may be defined for one or more, but not ALL, of the above |
311 | * compilers. We don't consider that to be an error, so set them to nothing. | |
312 | * For example, some of them are for compiler specific plugins. | |
d1515582 | 313 | */ |
d1515582 WD |
314 | #ifndef __latent_entropy |
315 | # define __latent_entropy | |
316 | #endif | |
317 | ||
595b893e KC |
318 | #if defined(RANDSTRUCT) && !defined(__CHECKER__) |
319 | # define __randomize_layout __designated_init __attribute__((randomize_layout)) | |
320 | # define __no_randomize_layout __attribute__((no_randomize_layout)) | |
321 | /* This anon struct can add padding, so only enable it under randstruct. */ | |
322 | # define randomized_struct_fields_start struct { | |
323 | # define randomized_struct_fields_end } __randomize_layout; | |
324 | #else | |
d1515582 | 325 | # define __randomize_layout __designated_init |
d1515582 | 326 | # define __no_randomize_layout |
d1515582 WD |
327 | # define randomized_struct_fields_start |
328 | # define randomized_struct_fields_end | |
329 | #endif | |
330 | ||
d08b9f0c ST |
331 | #ifndef __noscs |
332 | # define __noscs | |
333 | #endif | |
334 | ||
cf68fffb ST |
335 | #ifndef __nocfi |
336 | # define __nocfi | |
337 | #endif | |
338 | ||
86cffecd KC |
339 | /* |
340 | * Any place that could be marked with the "alloc_size" attribute is also | |
9ed9cac1 KC |
341 | * a place to be marked with the "malloc" attribute, except those that may |
342 | * be performing a _reallocation_, as that may alias the existing pointer. | |
343 | * For these, use __realloc_size(). | |
86cffecd KC |
344 | */ |
345 | #ifdef __alloc_size__ | |
346 | # define __alloc_size(x, ...) __alloc_size__(x, ## __VA_ARGS__) __malloc | |
9ed9cac1 | 347 | # define __realloc_size(x, ...) __alloc_size__(x, ## __VA_ARGS__) |
86cffecd KC |
348 | #else |
349 | # define __alloc_size(x, ...) __malloc | |
9ed9cac1 | 350 | # define __realloc_size(x, ...) |
86cffecd KC |
351 | #endif |
352 | ||
26dd68d2 PK |
353 | /* |
354 | * When the size of an allocated object is needed, use the best available | |
355 | * mechanism to find it. (For cases where sizeof() cannot be used.) | |
356 | */ | |
357 | #if __has_builtin(__builtin_dynamic_object_size) | |
358 | #define __struct_size(p) __builtin_dynamic_object_size(p, 0) | |
359 | #define __member_size(p) __builtin_dynamic_object_size(p, 1) | |
360 | #else | |
361 | #define __struct_size(p) __builtin_object_size(p, 0) | |
362 | #define __member_size(p) __builtin_object_size(p, 1) | |
363 | #endif | |
364 | ||
68fb3ca0 LT |
365 | /* |
366 | * Some versions of gcc do not mark 'asm goto' volatile: | |
367 | * | |
368 | * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103979 | |
369 | * | |
370 | * We do it here by hand, because it doesn't hurt. | |
371 | */ | |
4356e9f8 | 372 | #ifndef asm_goto_output |
68fb3ca0 | 373 | #define asm_goto_output(x...) asm volatile goto(x) |
8bd66d14 | 374 | #endif |
375 | ||
eb111869 RV |
376 | #ifdef CONFIG_CC_HAS_ASM_INLINE |
377 | #define asm_inline asm __inline | |
378 | #else | |
379 | #define asm_inline asm | |
380 | #endif | |
381 | ||
d1515582 | 382 | /* Are two types/vars the same type (ignoring qualifiers)? */ |
815f0ddb | 383 | #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
d1515582 | 384 | |
dee081bf WD |
385 | /* |
386 | * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving | |
387 | * non-scalar types unchanged. | |
1fd76043 | 388 | */ |
1fd76043 | 389 | /* |
6ec4476a | 390 | * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char' |
1fd76043 ME |
391 | * is not type-compatible with 'signed char', and we define a separate case. |
392 | */ | |
393 | #define __scalar_type_to_expr_cases(type) \ | |
394 | unsigned type: (unsigned type)0, \ | |
395 | signed type: (signed type)0 | |
396 | ||
397 | #define __unqual_scalar_typeof(x) typeof( \ | |
398 | _Generic((x), \ | |
399 | char: (char)0, \ | |
400 | __scalar_type_to_expr_cases(char), \ | |
401 | __scalar_type_to_expr_cases(short), \ | |
402 | __scalar_type_to_expr_cases(int), \ | |
403 | __scalar_type_to_expr_cases(long), \ | |
404 | __scalar_type_to_expr_cases(long long), \ | |
405 | default: (x))) | |
dee081bf | 406 | |
d1515582 | 407 | /* Is this type a native word size -- useful for atomic operations */ |
815f0ddb ND |
408 | #define __native_word(t) \ |
409 | (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ | |
410 | sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) | |
411 | ||
eb5c2d4b WD |
412 | #ifdef __OPTIMIZE__ |
413 | # define __compiletime_assert(condition, msg, prefix, suffix) \ | |
414 | do { \ | |
7c00621d MO |
415 | /* \ |
416 | * __noreturn is needed to give the compiler enough \ | |
417 | * information to avoid certain possibly-uninitialized \ | |
418 | * warnings (regardless of the build failing). \ | |
419 | */ \ | |
420 | __noreturn extern void prefix ## suffix(void) \ | |
421 | __compiletime_error(msg); \ | |
eb5c2d4b WD |
422 | if (!(condition)) \ |
423 | prefix ## suffix(); \ | |
424 | } while (0) | |
425 | #else | |
426 | # define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0) | |
427 | #endif | |
428 | ||
429 | #define _compiletime_assert(condition, msg, prefix, suffix) \ | |
430 | __compiletime_assert(condition, msg, prefix, suffix) | |
431 | ||
432 | /** | |
433 | * compiletime_assert - break build and emit msg if condition is false | |
434 | * @condition: a compile-time constant condition to check | |
435 | * @msg: a message to emit if condition is false | |
436 | * | |
437 | * In tradition of POSIX assert, this macro will break the build if the | |
438 | * supplied condition is *false*, emitting the supplied error message if the | |
439 | * compiler has support to do so. | |
440 | */ | |
441 | #define compiletime_assert(condition, msg) \ | |
442 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | |
443 | ||
444 | #define compiletime_assert_atomic_type(t) \ | |
445 | compiletime_assert(__native_word(t), \ | |
446 | "Need native word sized stores/loads for atomicity.") | |
447 | ||
815f0ddb | 448 | /* Helpers for emitting diagnostics in pragmas. */ |
8793bb7f AB |
449 | #ifndef __diag |
450 | #define __diag(string) | |
451 | #endif | |
452 | ||
453 | #ifndef __diag_GCC | |
454 | #define __diag_GCC(version, severity, string) | |
455 | #endif | |
456 | ||
457 | #define __diag_push() __diag(push) | |
458 | #define __diag_pop() __diag(pop) | |
459 | ||
460 | #define __diag_ignore(compiler, version, option, comment) \ | |
461 | __diag_ ## compiler(version, ignore, option) | |
462 | #define __diag_warn(compiler, version, option, comment) \ | |
463 | __diag_ ## compiler(version, warn, option) | |
464 | #define __diag_error(compiler, version, option, comment) \ | |
465 | __diag_ ## compiler(version, error, option) | |
466 | ||
4d1ea705 KKD |
467 | #ifndef __diag_ignore_all |
468 | #define __diag_ignore_all(option, comment) | |
469 | #endif | |
470 | ||
d1515582 | 471 | #endif /* __LINUX_COMPILER_TYPES_H */ |