Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_COMPILER_TYPES_H
3#error "Please do not include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
4#endif
5
6/*
7 * Common definitions for all gcc versions go here.
8 */
9#define GCC_VERSION (__GNUC__ * 10000 \
10 + __GNUC_MINOR__ * 100 \
11 + __GNUC_PATCHLEVEL__)
12
13/*
14 * This macro obfuscates arithmetic on a variable address so that gcc
15 * shouldn't recognize the original var, and make assumptions about it.
16 *
17 * This is needed because the C standard makes it undefined to do
18 * pointer arithmetic on "objects" outside their boundaries and the
19 * gcc optimizers assume this is the case. In particular they
20 * assume such arithmetic does not wrap.
21 *
22 * A miscompilation has been observed because of this on PPC.
23 * To work around it we hide the relationship of the pointer and the object
24 * using this macro.
25 *
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 worked around by changing
28 * the inline assembly constraint from =g to =r, in this particular
29 * case either is valid.
30 */
31#define RELOC_HIDE(ptr, off) \
32({ \
33 unsigned long __ptr; \
34 __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
35 (typeof(ptr)) (__ptr + (off)); \
36})
37
38#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
39#define __latent_entropy __attribute__((latent_entropy))
40#endif
41
42/*
43 * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
44 * confuse the stack allocation in gcc, leading to overly large stack
45 * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
46 *
47 * Adding an empty inline assembly before it works around the problem
48 */
49#define barrier_before_unreachable() asm volatile("")
50
51#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
52#define __HAVE_BUILTIN_BSWAP32__
53#define __HAVE_BUILTIN_BSWAP64__
54#define __HAVE_BUILTIN_BSWAP16__
55#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
56
57#if GCC_VERSION >= 70000
58#define KASAN_ABI_VERSION 5
59#else
60#define KASAN_ABI_VERSION 4
61#endif
62
63#ifdef CONFIG_SHADOW_CALL_STACK
64#define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
65#endif
66
67#ifdef __SANITIZE_HWADDRESS__
68#define __no_sanitize_address __attribute__((__no_sanitize__("hwaddress")))
69#else
70#define __no_sanitize_address __attribute__((__no_sanitize_address__))
71#endif
72
73#if defined(__SANITIZE_THREAD__)
74#define __no_sanitize_thread __attribute__((__no_sanitize_thread__))
75#else
76#define __no_sanitize_thread
77#endif
78
79#define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__))
80
81/*
82 * Only supported since gcc >= 12
83 */
84#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
85#define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__))
86#else
87#define __no_sanitize_coverage
88#endif
89
90/*
91 * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel,
92 * matching the defines used by Clang.
93 */
94#ifdef __SANITIZE_HWADDRESS__
95#define __SANITIZE_ADDRESS__
96#endif
97
98/*
99 * GCC does not support KMSAN.
100 */
101#define __no_sanitize_memory
102#define __no_kmsan_checks
103
104/*
105 * Turn individual warnings and errors on and off locally, depending
106 * on version.
107 */
108#define __diag_GCC(version, severity, s) \
109 __diag_GCC_ ## version(__diag_GCC_ ## severity s)
110
111/* Severity used in pragma directives */
112#define __diag_GCC_ignore ignored
113#define __diag_GCC_warn warning
114#define __diag_GCC_error error
115
116#define __diag_str1(s) #s
117#define __diag_str(s) __diag_str1(s)
118#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
119
120#if GCC_VERSION >= 80000
121#define __diag_GCC_8(s) __diag(s)
122#else
123#define __diag_GCC_8(s)
124#endif
125
126#define __diag_GCC_all(s) __diag(s)
127
128#define __diag_ignore_all(option, comment) \
129 __diag(__diag_GCC_ignore option)
130
131/*
132 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
133 * attribute) do not work, and must be disabled.
134 */
135#if GCC_VERSION < 90100
136#undef __alloc_size__
137#endif
138
139/*
140 * Declare compiler support for __typeof_unqual__() operator.
141 *
142 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot
143 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.
144 */
145#define CC_HAS_TYPEOF_UNQUAL (__GNUC__ >= 14)