1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __LINUX_COMPILER_TYPES_H
3#error "Please don't 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_RETPOLINE
39#define __noretpoline __attribute__((__indirect_branch__("keep")))
40#endif
41
42#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
43
44#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
45#define __latent_entropy __attribute__((latent_entropy))
46#endif
47
48/*
49 * calling noreturn functions, __builtin_unreachable() and __builtin_trap()
50 * confuse the stack allocation in gcc, leading to overly large stack
51 * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
52 *
53 * Adding an empty inline assembly before it works around the problem
54 */
55#define barrier_before_unreachable() asm volatile("")
56
57/*
58 * Mark a position in code as unreachable.  This can be used to
59 * suppress control flow warnings after asm blocks that transfer
60 * control elsewhere.
61 */
62#define unreachable() \
63	do {					\
64		annotate_unreachable();		\
65		barrier_before_unreachable();	\
66		__builtin_unreachable();	\
67	} while (0)
68
69#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
70#define __HAVE_BUILTIN_BSWAP32__
71#define __HAVE_BUILTIN_BSWAP64__
72#define __HAVE_BUILTIN_BSWAP16__
73#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
74
75#if GCC_VERSION >= 70000
76#define KASAN_ABI_VERSION 5
77#else
78#define KASAN_ABI_VERSION 4
79#endif
80
81#ifdef CONFIG_SHADOW_CALL_STACK
82#define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
83#endif
84
85#if __has_attribute(__no_sanitize_address__)
86#define __no_sanitize_address __attribute__((no_sanitize_address))
87#else
88#define __no_sanitize_address
89#endif
90
91#if defined(__SANITIZE_THREAD__) && __has_attribute(__no_sanitize_thread__)
92#define __no_sanitize_thread __attribute__((no_sanitize_thread))
93#else
94#define __no_sanitize_thread
95#endif
96
97#if __has_attribute(__no_sanitize_undefined__)
98#define __no_sanitize_undefined __attribute__((no_sanitize_undefined))
99#else
100#define __no_sanitize_undefined
101#endif
102
103#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
104#define __no_sanitize_coverage __attribute__((no_sanitize_coverage))
105#else
106#define __no_sanitize_coverage
107#endif
108
109/*
110 * Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel,
111 * matching the defines used by Clang.
112 */
113#ifdef __SANITIZE_HWADDRESS__
114#define __SANITIZE_ADDRESS__
115#endif
116
117/*
118 * Turn individual warnings and errors on and off locally, depending
119 * on version.
120 */
121#define __diag_GCC(version, severity, s) \
122	__diag_GCC_ ## version(__diag_GCC_ ## severity s)
123
124/* Severity used in pragma directives */
125#define __diag_GCC_ignore	ignored
126#define __diag_GCC_warn		warning
127#define __diag_GCC_error	error
128
129#define __diag_str1(s)		#s
130#define __diag_str(s)		__diag_str1(s)
131#define __diag(s)		_Pragma(__diag_str(GCC diagnostic s))
132
133#if GCC_VERSION >= 80000
134#define __diag_GCC_8(s)		__diag(s)
135#else
136#define __diag_GCC_8(s)
137#endif
138
139#define __diag_ignore_all(option, comment) \
140	__diag_GCC(8, ignore, option)
141
142/*
143 * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
144 * attribute) do not work, and must be disabled.
145 */
146#if GCC_VERSION < 90100
147#undef __alloc_size__
148#endif
149