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 #endif /* __KERNEL__ */ 108 109 #endif /* __ASSEMBLY__ */ 110 111 /* 112 * The below symbols may be defined for one or more, but not ALL, of the above 113 * compilers. We don't consider that to be an error, so set them to nothing. 114 * For example, some of them are for compiler specific plugins. 115 */ 116 #ifndef __latent_entropy 117 # define __latent_entropy 118 #endif 119 120 #ifndef __randomize_layout 121 # define __randomize_layout __designated_init 122 #endif 123 124 #ifndef __no_randomize_layout 125 # define __no_randomize_layout 126 #endif 127 128 #ifndef randomized_struct_fields_start 129 # define randomized_struct_fields_start 130 # define randomized_struct_fields_end 131 #endif 132 133 #ifndef asm_volatile_goto 134 #define asm_volatile_goto(x...) asm goto(x) 135 #endif 136 137 /* Are two types/vars the same type (ignoring qualifiers)? */ 138 #define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) 139 140 /* Is this type a native word size -- useful for atomic operations */ 141 #define __native_word(t) \ 142 (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \ 143 sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long)) 144 145 /* Helpers for emitting diagnostics in pragmas. */ 146 #ifndef __diag 147 #define __diag(string) 148 #endif 149 150 #ifndef __diag_GCC 151 #define __diag_GCC(version, severity, string) 152 #endif 153 154 #define __diag_push() __diag(push) 155 #define __diag_pop() __diag(pop) 156 157 #define __diag_ignore(compiler, version, option, comment) \ 158 __diag_ ## compiler(version, ignore, option) 159 #define __diag_warn(compiler, version, option, comment) \ 160 __diag_ ## compiler(version, warn, option) 161 #define __diag_error(compiler, version, option, comment) \ 162 __diag_ ## compiler(version, error, option) 163 164 #ifdef CONFIG_ENABLE_MUST_CHECK 165 #define __must_check __attribute__((__warn_unused_result__)) 166 #else 167 #define __must_check 168 #endif 169 170 #if defined(CC_USING_HOTPATCH) 171 #define notrace __attribute__((hotpatch(0, 0))) 172 #else 173 #define notrace __attribute__((__no_instrument_function__)) 174 #endif 175 176 /* 177 * it doesn't make sense on ARM (currently the only user of __naked) 178 * to trace naked functions because then mcount is called without 179 * stack and frame pointer being set up and there is no chance to 180 * restore the lr register to the value before mcount was called. 181 */ 182 #define __naked __attribute__((__naked__)) notrace 183 184 #define __compiler_offsetof(a, b) __builtin_offsetof(a, b) 185 186 /* 187 * Force always-inline if the user requests it so via the .config. 188 * GCC does not warn about unused static inline functions for 189 * -Wunused-function. This turns out to avoid the need for complex #ifdef 190 * directives. Suppress the warning in clang as well by using "unused" 191 * function attribute, which is redundant but not harmful for gcc. 192 * Prefer gnu_inline, so that extern inline functions do not emit an 193 * externally visible function. This makes extern inline behave as per gnu89 194 * semantics rather than c99. This prevents multiple symbol definition errors 195 * of extern inline functions at link time. 196 * A lot of inline functions can cause havoc with function tracing. 197 * Do not use __always_inline here, since currently it expands to inline again 198 * (which would break users of __always_inline). 199 */ 200 #if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \ 201 !defined(CONFIG_OPTIMIZE_INLINING) 202 #define inline inline __attribute__((__always_inline__)) __gnu_inline \ 203 __maybe_unused notrace 204 #else 205 #define inline inline __gnu_inline \ 206 __maybe_unused notrace 207 #endif 208 209 #define __inline__ inline 210 #define __inline inline 211 212 /* 213 * Rather then using noinline to prevent stack consumption, use 214 * noinline_for_stack instead. For documentation reasons. 215 */ 216 #define noinline_for_stack noinline 217 218 #endif /* __LINUX_COMPILER_TYPES_H */ 219