| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __LINUX_COMPILER_TYPES_H |
| #define __LINUX_COMPILER_TYPES_H |
| |
| #ifndef __ASSEMBLY__ |
| |
| #ifdef __CHECKER__ |
| /* address spaces */ |
| # define __kernel __attribute__((address_space(0))) |
| # define __user __attribute__((noderef, address_space(__user))) |
| # define __iomem __attribute__((noderef, address_space(__iomem))) |
| # define __percpu __attribute__((noderef, address_space(__percpu))) |
| # define __rcu __attribute__((noderef, address_space(__rcu))) |
| static inline void __chk_user_ptr(const volatile void __user *ptr) { } |
| static inline void __chk_io_ptr(const volatile void __iomem *ptr) { } |
| /* context/locking */ |
| # define __must_hold(x) __attribute__((context(x,1,1))) |
| # define __acquires(x) __attribute__((context(x,0,1))) |
| # define __releases(x) __attribute__((context(x,1,0))) |
| # define __acquire(x) __context__(x,1) |
| # define __release(x) __context__(x,-1) |
| # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) |
| /* other */ |
| # define __force __attribute__((force)) |
| # define __nocast __attribute__((nocast)) |
| # define __safe __attribute__((safe)) |
| # define __private __attribute__((noderef)) |
| # define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member)) |
| #else /* __CHECKER__ */ |
| /* address spaces */ |
| # define __kernel |
| # ifdef STRUCTLEAK_PLUGIN |
| # define __user __attribute__((user)) |
| # else |
| # define __user |
| # endif |
| # define __iomem |
| # define __percpu |
| # define __rcu |
| # define __chk_user_ptr(x) (void)0 |
| # define __chk_io_ptr(x) (void)0 |
| /* context/locking */ |
| # define __must_hold(x) |
| # define __acquires(x) |
| # define __releases(x) |
| # define __acquire(x) (void)0 |
| # define __release(x) (void)0 |
| # define __cond_lock(x,c) (c) |
| /* other */ |
| # define __force |
| # define __nocast |
| # define __safe |
| # define __private |
| # define ACCESS_PRIVATE(p, member) ((p)->member) |
| # define __builtin_warning(x, y...) (1) |
| #endif /* __CHECKER__ */ |
| |
| /* Indirect macros required for expanded argument pasting, eg. __LINE__. */ |
| #define ___PASTE(a,b) a##b |
| #define __PASTE(a,b) ___PASTE(a,b) |
| |
| #ifdef __KERNEL__ |
| |
| /* Attributes */ |
| #include <linux/compiler_attributes.h> |
| |
| /* Builtins */ |
| |
| /* |
| * __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21. |
| * In the meantime, to support gcc < 10, we implement __has_builtin |
| * by hand. |
| */ |
| #ifndef __has_builtin |
| #define __has_builtin(x) (0) |
| #endif |
| |
| /* Compiler specific macros. */ |
| #ifdef __clang__ |
| #include <linux/compiler-clang.h> |
| #elif defined(__INTEL_COMPILER) |
| #include <linux/compiler-intel.h> |
| #elif defined(__GNUC__) |
| /* The above compilers also define __GNUC__, so order is important here. */ |
| #include <linux/compiler-gcc.h> |
| #else |
| #error "Unknown compiler" |
| #endif |
| |
| /* |
| * Some architectures need to provide custom definitions of macros provided |
| * by linux/compiler-*.h, and can do so using asm/compiler.h. We include that |
| * conditionally rather than using an asm-generic wrapper in order to avoid |
| * build failures if any C compilation, which will include this file via an |
| * -include argument in c_flags, occurs prior to the asm-generic wrappers being |
| * generated. |
| */ |
| #ifdef CONFIG_HAVE_ARCH_COMPILER_H |
| #include <asm/compiler.h> |
| #endif |
| |
| struct ftrace_branch_data { |
| const char *func; |
| const char *file; |
| unsigned line; |
| union { |
| struct { |
| unsigned long correct; |
| unsigned long incorrect; |
| }; |
| struct { |
| unsigned long miss; |
| unsigned long hit; |
| }; |
| unsigned long miss_hit[2]; |
| }; |
| }; |
| |
| struct ftrace_likely_data { |
| struct ftrace_branch_data data; |
| unsigned long constant; |
| }; |
| |
| #if defined(CC_USING_HOTPATCH) |
| #define notrace __attribute__((hotpatch(0, 0))) |
| #elif defined(CC_USING_PATCHABLE_FUNCTION_ENTRY) |
| #define notrace __attribute__((patchable_function_entry(0, 0))) |
| #else |
| #define notrace __attribute__((__no_instrument_function__)) |
| #endif |
| |
| /* |
| * it doesn't make sense on ARM (currently the only user of __naked) |
| * to trace naked functions because then mcount is called without |
| * stack and frame pointer being set up and there is no chance to |
| * restore the lr register to the value before mcount was called. |
| */ |
| #define __naked __attribute__((__naked__)) notrace |
| |
| #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) |
| |
| /* |
| * Prefer gnu_inline, so that extern inline functions do not emit an |
| * externally visible function. This makes extern inline behave as per gnu89 |
| * semantics rather than c99. This prevents multiple symbol definition errors |
| * of extern inline functions at link time. |
| * A lot of inline functions can cause havoc with function tracing. |
| */ |
| #define inline inline __gnu_inline __inline_maybe_unused notrace |
| |
| /* |
| * gcc provides both __inline__ and __inline as alternate spellings of |
| * the inline keyword, though the latter is undocumented. New kernel |
| * code should only use the inline spelling, but some existing code |
| * uses __inline__. Since we #define inline above, to ensure |
| * __inline__ has the same semantics, we need this #define. |
| * |
| * However, the spelling __inline is strictly reserved for referring |
| * to the bare keyword. |
| */ |
| #define __inline__ inline |
| |
| /* |
| * GCC does not warn about unused static inline functions for -Wunused-function. |
| * Suppress the warning in clang as well by using __maybe_unused, but enable it |
| * for W=1 build. This will allow clang to find unused functions. Remove the |
| * __inline_maybe_unused entirely after fixing most of -Wunused-function warnings. |
| */ |
| #ifdef KBUILD_EXTRA_WARN1 |
| #define __inline_maybe_unused |
| #else |
| #define __inline_maybe_unused __maybe_unused |
| #endif |
| |
| /* |
| * Rather then using noinline to prevent stack consumption, use |
| * noinline_for_stack instead. For documentation reasons. |
| */ |
| #define noinline_for_stack noinline |
| |
| /* |
| * Sanitizer helper attributes: Because using __always_inline and |
| * __no_sanitize_* conflict, provide helper attributes that will either expand |
| * to __no_sanitize_* in compilation units where instrumentation is enabled |
| * (__SANITIZE_*__), or __always_inline in compilation units without |
| * instrumentation (__SANITIZE_*__ undefined). |
| */ |
| #ifdef __SANITIZE_ADDRESS__ |
| /* |
| * We can't declare function 'inline' because __no_sanitize_address conflicts |
| * with inlining. Attempt to inline it may cause a build failure. |
| * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 |
| * '__maybe_unused' allows us to avoid defined-but-not-used warnings. |
| */ |
| # define __no_kasan_or_inline __no_sanitize_address notrace __maybe_unused |
| # define __no_sanitize_or_inline __no_kasan_or_inline |
| #else |
| # define __no_kasan_or_inline __always_inline |
| #endif |
| |
| #define __no_kcsan __no_sanitize_thread |
| #ifdef __SANITIZE_THREAD__ |
| # define __no_sanitize_or_inline __no_kcsan notrace __maybe_unused |
| #endif |
| |
| #ifndef __no_sanitize_or_inline |
| #define __no_sanitize_or_inline __always_inline |
| #endif |
| |
| /* Section for code which can't be instrumented at all */ |
| #define noinstr \ |
| noinline notrace __attribute((__section__(".noinstr.text"))) \ |
| __no_kcsan __no_sanitize_address |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| /* |
| * The below symbols may be defined for one or more, but not ALL, of the above |
| * compilers. We don't consider that to be an error, so set them to nothing. |
| * For example, some of them are for compiler specific plugins. |
| */ |
| #ifndef __latent_entropy |
| # define __latent_entropy |
| #endif |
| |
| #ifndef __randomize_layout |
| # define __randomize_layout __designated_init |
| #endif |
| |
| #ifndef __no_randomize_layout |
| # define __no_randomize_layout |
| #endif |
| |
| #ifndef randomized_struct_fields_start |
| # define randomized_struct_fields_start |
| # define randomized_struct_fields_end |
| #endif |
| |
| #ifndef __noscs |
| # define __noscs |
| #endif |
| |
| #ifndef asm_volatile_goto |
| #define asm_volatile_goto(x...) asm goto(x) |
| #endif |
| |
| #ifdef CONFIG_CC_HAS_ASM_INLINE |
| #define asm_inline asm __inline |
| #else |
| #define asm_inline asm |
| #endif |
| |
| /* Are two types/vars the same type (ignoring qualifiers)? */ |
| #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
| |
| /* |
| * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving |
| * non-scalar types unchanged. |
| */ |
| /* |
| * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char' |
| * is not type-compatible with 'signed char', and we define a separate case. |
| */ |
| #define __scalar_type_to_expr_cases(type) \ |
| unsigned type: (unsigned type)0, \ |
| signed type: (signed type)0 |
| |
| #define __unqual_scalar_typeof(x) typeof( \ |
| _Generic((x), \ |
| char: (char)0, \ |
| __scalar_type_to_expr_cases(char), \ |
| __scalar_type_to_expr_cases(short), \ |
| __scalar_type_to_expr_cases(int), \ |
| __scalar_type_to_expr_cases(long), \ |
| __scalar_type_to_expr_cases(long long), \ |
| default: (x))) |
| |
| /* Is this type a native word size -- useful for atomic operations */ |
| #define __native_word(t) \ |
| (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ |
| sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) |
| |
| /* Compile time object size, -1 for unknown */ |
| #ifndef __compiletime_object_size |
| # define __compiletime_object_size(obj) -1 |
| #endif |
| #ifndef __compiletime_warning |
| # define __compiletime_warning(message) |
| #endif |
| #ifndef __compiletime_error |
| # define __compiletime_error(message) |
| #endif |
| |
| #ifdef __OPTIMIZE__ |
| # define __compiletime_assert(condition, msg, prefix, suffix) \ |
| do { \ |
| extern void prefix ## suffix(void) __compiletime_error(msg); \ |
| if (!(condition)) \ |
| prefix ## suffix(); \ |
| } while (0) |
| #else |
| # define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0) |
| #endif |
| |
| #define _compiletime_assert(condition, msg, prefix, suffix) \ |
| __compiletime_assert(condition, msg, prefix, suffix) |
| |
| /** |
| * compiletime_assert - break build and emit msg if condition is false |
| * @condition: a compile-time constant condition to check |
| * @msg: a message to emit if condition is false |
| * |
| * In tradition of POSIX assert, this macro will break the build if the |
| * supplied condition is *false*, emitting the supplied error message if the |
| * compiler has support to do so. |
| */ |
| #define compiletime_assert(condition, msg) \ |
| _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) |
| |
| #define compiletime_assert_atomic_type(t) \ |
| compiletime_assert(__native_word(t), \ |
| "Need native word sized stores/loads for atomicity.") |
| |
| /* Helpers for emitting diagnostics in pragmas. */ |
| #ifndef __diag |
| #define __diag(string) |
| #endif |
| |
| #ifndef __diag_GCC |
| #define __diag_GCC(version, severity, string) |
| #endif |
| |
| #define __diag_push() __diag(push) |
| #define __diag_pop() __diag(pop) |
| |
| #define __diag_ignore(compiler, version, option, comment) \ |
| __diag_ ## compiler(version, ignore, option) |
| #define __diag_warn(compiler, version, option, comment) \ |
| __diag_ ## compiler(version, warn, option) |
| #define __diag_error(compiler, version, option, comment) \ |
| __diag_ ## compiler(version, error, option) |
| |
| #endif /* __LINUX_COMPILER_TYPES_H */ |