1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_COMPILER_TYPES_H 2 #ifndef __LINUX_COMPILER_TYPES_H
3 #error "Please don't include <linux/compiler-g 3 #error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
4 #endif 4 #endif
5 5
6 /* 6 /*
7 * Common definitions for all gcc versions go 7 * Common definitions for all gcc versions go here.
8 */ 8 */
9 #define GCC_VERSION (__GNUC__ * 10000 9 #define GCC_VERSION (__GNUC__ * 10000 \
10 + __GNUC_MINOR__ * 100 10 + __GNUC_MINOR__ * 100 \
11 + __GNUC_PATCHLEVEL__) 11 + __GNUC_PATCHLEVEL__)
12 12
13 /* 13 /*
14 * This macro obfuscates arithmetic on a varia 14 * This macro obfuscates arithmetic on a variable address so that gcc
15 * shouldn't recognize the original var, and m 15 * shouldn't recognize the original var, and make assumptions about it.
16 * 16 *
17 * This is needed because the C standard makes 17 * This is needed because the C standard makes it undefined to do
18 * pointer arithmetic on "objects" outside the 18 * pointer arithmetic on "objects" outside their boundaries and the
19 * gcc optimizers assume this is the case. In 19 * gcc optimizers assume this is the case. In particular they
20 * assume such arithmetic does not wrap. 20 * assume such arithmetic does not wrap.
21 * 21 *
22 * A miscompilation has been observed because 22 * A miscompilation has been observed because of this on PPC.
23 * To work around it we hide the relationship 23 * To work around it we hide the relationship of the pointer and the object
24 * using this macro. 24 * using this macro.
25 * 25 *
26 * Versions of the ppc64 compiler before 4.1 h 26 * Versions of the ppc64 compiler before 4.1 had a bug where use of
27 * RELOC_HIDE could trash r30. The bug can be 27 * RELOC_HIDE could trash r30. The bug can be worked around by changing
28 * the inline assembly constraint from =g to = 28 * the inline assembly constraint from =g to =r, in this particular
29 * case either is valid. 29 * case either is valid.
30 */ 30 */
31 #define RELOC_HIDE(ptr, off) 31 #define RELOC_HIDE(ptr, off) \
32 ({ 32 ({ \
33 unsigned long __ptr; 33 unsigned long __ptr; \
34 __asm__ ("" : "=r"(__ptr) : ""(ptr)); 34 __asm__ ("" : "=r"(__ptr) : ""(ptr)); \
35 (typeof(ptr)) (__ptr + (off)); 35 (typeof(ptr)) (__ptr + (off)); \
36 }) 36 })
37 37
38 #ifdef CONFIG_MITIGATION_RETPOLINE !! 38 #ifdef CONFIG_RETPOLINE
39 #define __noretpoline __attribute__((__indirec 39 #define __noretpoline __attribute__((__indirect_branch__("keep")))
40 #endif 40 #endif
41 41
>> 42 #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
>> 43
42 #if defined(LATENT_ENTROPY_PLUGIN) && !defined 44 #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
43 #define __latent_entropy __attribute__((latent 45 #define __latent_entropy __attribute__((latent_entropy))
44 #endif 46 #endif
45 47
46 /* 48 /*
47 * calling noreturn functions, __builtin_unrea 49 * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
48 * confuse the stack allocation in gcc, leadin 50 * confuse the stack allocation in gcc, leading to overly large stack
49 * frames, see https://gcc.gnu.org/bugzilla/sh 51 * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
50 * 52 *
51 * Adding an empty inline assembly before it w 53 * Adding an empty inline assembly before it works around the problem
52 */ 54 */
53 #define barrier_before_unreachable() asm volat 55 #define barrier_before_unreachable() asm volatile("")
54 56
55 /* 57 /*
56 * Mark a position in code as unreachable. Th 58 * Mark a position in code as unreachable. This can be used to
57 * suppress control flow warnings after asm bl 59 * suppress control flow warnings after asm blocks that transfer
58 * control elsewhere. 60 * control elsewhere.
59 */ 61 */
60 #define unreachable() \ 62 #define unreachable() \
61 do { 63 do { \
62 annotate_unreachable(); 64 annotate_unreachable(); \
63 barrier_before_unreachable(); 65 barrier_before_unreachable(); \
64 __builtin_unreachable(); 66 __builtin_unreachable(); \
65 } while (0) 67 } while (0)
66 68
>> 69 #if defined(RANDSTRUCT_PLUGIN) && !defined(__CHECKER__)
>> 70 #define __randomize_layout __attribute__((randomize_layout))
>> 71 #define __no_randomize_layout __attribute__((no_randomize_layout))
>> 72 /* This anon struct can add padding, so only enable it under randstruct. */
>> 73 #define randomized_struct_fields_start struct {
>> 74 #define randomized_struct_fields_end } __randomize_layout;
>> 75 #endif
>> 76
>> 77 /*
>> 78 * GCC 'asm goto' miscompiles certain code sequences:
>> 79 *
>> 80 * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
>> 81 *
>> 82 * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
>> 83 *
>> 84 * (asm goto is automatically volatile - the naming reflects this.)
>> 85 */
>> 86 #define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
>> 87
67 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) 88 #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
68 #define __HAVE_BUILTIN_BSWAP32__ 89 #define __HAVE_BUILTIN_BSWAP32__
69 #define __HAVE_BUILTIN_BSWAP64__ 90 #define __HAVE_BUILTIN_BSWAP64__
70 #define __HAVE_BUILTIN_BSWAP16__ 91 #define __HAVE_BUILTIN_BSWAP16__
71 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ 92 #endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
72 93
73 #if GCC_VERSION >= 70000 94 #if GCC_VERSION >= 70000
74 #define KASAN_ABI_VERSION 5 95 #define KASAN_ABI_VERSION 5
75 #else 96 #else
76 #define KASAN_ABI_VERSION 4 97 #define KASAN_ABI_VERSION 4
77 #endif 98 #endif
78 99
79 #ifdef CONFIG_SHADOW_CALL_STACK !! 100 #if __has_attribute(__no_sanitize_address__)
80 #define __noscs __attribute__((__no_sanitize__ !! 101 #define __no_sanitize_address __attribute__((no_sanitize_address))
81 #endif <<
82 <<
83 #ifdef __SANITIZE_HWADDRESS__ <<
84 #define __no_sanitize_address __attribute__((_ <<
85 #else 102 #else
86 #define __no_sanitize_address __attribute__((_ !! 103 #define __no_sanitize_address
87 #endif 104 #endif
88 105
89 #if defined(__SANITIZE_THREAD__) !! 106 #if defined(__SANITIZE_THREAD__) && __has_attribute(__no_sanitize_thread__)
90 #define __no_sanitize_thread __attribute__((__ !! 107 #define __no_sanitize_thread __attribute__((no_sanitize_thread))
91 #else 108 #else
92 #define __no_sanitize_thread 109 #define __no_sanitize_thread
93 #endif 110 #endif
94 111
95 #define __no_sanitize_undefined __attribute__( !! 112 #if __has_attribute(__no_sanitize_undefined__)
>> 113 #define __no_sanitize_undefined __attribute__((no_sanitize_undefined))
>> 114 #else
>> 115 #define __no_sanitize_undefined
>> 116 #endif
96 117
97 /* <<
98 * Only supported since gcc >= 12 <<
99 */ <<
100 #if defined(CONFIG_KCOV) && __has_attribute(__ 118 #if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
101 #define __no_sanitize_coverage __attribute__(( !! 119 #define __no_sanitize_coverage __attribute__((no_sanitize_coverage))
102 #else 120 #else
103 #define __no_sanitize_coverage 121 #define __no_sanitize_coverage
104 #endif 122 #endif
105 123
106 /* 124 /*
107 * Treat __SANITIZE_HWADDRESS__ the same as __ 125 * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel,
108 * matching the defines used by Clang. 126 * matching the defines used by Clang.
109 */ 127 */
110 #ifdef __SANITIZE_HWADDRESS__ 128 #ifdef __SANITIZE_HWADDRESS__
111 #define __SANITIZE_ADDRESS__ 129 #define __SANITIZE_ADDRESS__
112 #endif 130 #endif
113 131
114 /* 132 /*
115 * GCC does not support KMSAN. <<
116 */ <<
117 #define __no_sanitize_memory <<
118 #define __no_kmsan_checks <<
119 <<
120 /* <<
121 * Turn individual warnings and errors on and 133 * Turn individual warnings and errors on and off locally, depending
122 * on version. 134 * on version.
123 */ 135 */
124 #define __diag_GCC(version, severity, s) \ 136 #define __diag_GCC(version, severity, s) \
125 __diag_GCC_ ## version(__diag_GCC_ ## 137 __diag_GCC_ ## version(__diag_GCC_ ## severity s)
126 138
127 /* Severity used in pragma directives */ 139 /* Severity used in pragma directives */
128 #define __diag_GCC_ignore ignored 140 #define __diag_GCC_ignore ignored
129 #define __diag_GCC_warn warning 141 #define __diag_GCC_warn warning
130 #define __diag_GCC_error error 142 #define __diag_GCC_error error
131 143
132 #define __diag_str1(s) #s 144 #define __diag_str1(s) #s
133 #define __diag_str(s) __diag_str1(s) 145 #define __diag_str(s) __diag_str1(s)
134 #define __diag(s) _Pragma(__diag 146 #define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
135 147
136 #if GCC_VERSION >= 80000 148 #if GCC_VERSION >= 80000
137 #define __diag_GCC_8(s) __diag(s) 149 #define __diag_GCC_8(s) __diag(s)
138 #else 150 #else
139 #define __diag_GCC_8(s) 151 #define __diag_GCC_8(s)
140 #endif 152 #endif
141 <<
142 #define __diag_ignore_all(option, comment) \ <<
143 __diag(__diag_GCC_ignore option) <<
144 153
145 /* 154 /*
146 * Prior to 9.1, -Wno-alloc-size-larger-than ( 155 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
147 * attribute) do not work, and must be disable 156 * attribute) do not work, and must be disabled.
148 */ 157 */
149 #if GCC_VERSION < 90100 158 #if GCC_VERSION < 90100
150 #undef __alloc_size__ 159 #undef __alloc_size__
151 #endif 160 #endif
152 161
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