Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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#ifdef CONFIG_MITIGATION_RETPOLINE
39#define __noretpoline __attribute__((__indirect_branch__("keep")))
40#endif
41
42#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
43#define __latent_entropy __attribute__((latent_entropy))
44#endif
45
46/*
47 * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
48 * confuse the stack allocation in gcc, leading to overly large stack
49 * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
50 *
51 * Adding an empty inline assembly before it works around the problem
52 */
53#define barrier_before_unreachable() asm volatile("")
54
55#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
56#define __HAVE_BUILTIN_BSWAP32__
57#define __HAVE_BUILTIN_BSWAP64__
58#define __HAVE_BUILTIN_BSWAP16__
59#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
60
61#if GCC_VERSION >= 70000
62#define KASAN_ABI_VERSION 5
63#else
64#define KASAN_ABI_VERSION 4
65#endif
66
67#ifdef CONFIG_SHADOW_CALL_STACK
68#define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
69#endif
70
71#ifdef __SANITIZE_HWADDRESS__
72#define __no_sanitize_address __attribute__((__no_sanitize__("hwaddress")))
73#else
74#define __no_sanitize_address __attribute__((__no_sanitize_address__))
75#endif
76
77#if defined(__SANITIZE_THREAD__)
78#define __no_sanitize_thread __attribute__((__no_sanitize_thread__))
79#else
80#define __no_sanitize_thread
81#endif
82
83#define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__))
84
85/*
86 * Only supported since gcc >= 12
87 */
88#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
89#define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__))
90#else
91#define __no_sanitize_coverage
92#endif
93
94/*
95 * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel,
96 * matching the defines used by Clang.
97 */
98#ifdef __SANITIZE_HWADDRESS__
99#define __SANITIZE_ADDRESS__
100#endif
101
102/*
103 * GCC does not support KMSAN.
104 */
105#define __no_sanitize_memory
106#define __no_kmsan_checks
107
108/*
109 * Turn individual warnings and errors on and off locally, depending
110 * on version.
111 */
112#define __diag_GCC(version, severity, s) \
113 __diag_GCC_ ## version(__diag_GCC_ ## severity s)
114
115/* Severity used in pragma directives */
116#define __diag_GCC_ignore ignored
117#define __diag_GCC_warn warning
118#define __diag_GCC_error error
119
120#define __diag_str1(s) #s
121#define __diag_str(s) __diag_str1(s)
122#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
123
124#if GCC_VERSION >= 80000
125#define __diag_GCC_8(s) __diag(s)
126#else
127#define __diag_GCC_8(s)
128#endif
129
130#define __diag_ignore_all(option, comment) \
131 __diag(__diag_GCC_ignore option)
132
133/*
134 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
135 * attribute) do not work, and must be disabled.
136 */
137#if GCC_VERSION < 90100
138#undef __alloc_size__
139#endif
140
141/*
142 * Declare compiler support for __typeof_unqual__() operator.
143 *
144 * Bindgen uses LLVM even if our C compiler is GCC, so we cannot
145 * rely on the auto-detected CONFIG_CC_HAS_TYPEOF_UNQUAL.
146 */
147#define CC_HAS_TYPEOF_UNQUAL (__GNUC__ >= 14)