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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_COMPILER_TYPES_H
#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
#endif
/*
* Common definitions for all gcc versions go here.
*/
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
/*
* This macro obfuscates arithmetic on a variable address so that gcc
* shouldn't recognize the original var, and make assumptions about it.
*
* This is needed because the C standard makes it undefined to do
* pointer arithmetic on "objects" outside their boundaries and the
* gcc optimizers assume this is the case. In particular they
* assume such arithmetic does not wrap.
*
* A miscompilation has been observed because of this on PPC.
* To work around it we hide the relationship of the pointer and the object
* using this macro.
*
* Versions of the ppc64 compiler before 4.1 had a bug where use of
* RELOC_HIDE could trash r30. The bug can be worked around by changing
* the inline assembly constraint from =g to =r, in this particular
* case either is valid.
*/
#define RELOC_HIDE(ptr, off) \
({ \
unsigned long __ptr; \
__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
(typeof(ptr)) (__ptr + (off)); \
})
#ifdef CONFIG_MITIGATION_RETPOLINE
#define __noretpoline __attribute__((__indirect_branch__("keep")))
#endif
#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__)
#define __latent_entropy __attribute__((latent_entropy))
#endif
/*
* calling noreturn functions, __builtin_unreachable() and __builtin_trap()
* confuse the stack allocation in gcc, leading to overly large stack
* frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365
*
* Adding an empty inline assembly before it works around the problem
*/
#define barrier_before_unreachable() asm volatile("")
/*
* Mark a position in code as unreachable. This can be used to
* suppress control flow warnings after asm blocks that transfer
* control elsewhere.
*/
#define unreachable() \
do { \
annotate_unreachable(); \
barrier_before_unreachable(); \
__builtin_unreachable(); \
} while (0)
/*
* GCC 'asm goto' with outputs miscompiles certain code sequences:
*
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921
*
* Work around it via the same compiler barrier quirk that we used
* to use for the old 'asm goto' workaround.
*
* Also, always mark such 'asm goto' statements as volatile: all
* asm goto statements are supposed to be volatile as per the
* documentation, but some versions of gcc didn't actually do
* that for asms with outputs:
*
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619
*/
#ifdef CONFIG_GCC_ASM_GOTO_OUTPUT_WORKAROUND
#define asm_goto_output(x...) \
do { asm volatile goto(x); asm (""); } while (0)
#endif
#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP)
#define __HAVE_BUILTIN_BSWAP32__
#define __HAVE_BUILTIN_BSWAP64__
#define __HAVE_BUILTIN_BSWAP16__
#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
#if GCC_VERSION >= 70000
#define KASAN_ABI_VERSION 5
#else
#define KASAN_ABI_VERSION 4
#endif
#ifdef CONFIG_SHADOW_CALL_STACK
#define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
#endif
#define __no_sanitize_address __attribute__((__no_sanitize_address__))
#if defined(__SANITIZE_THREAD__)
#define __no_sanitize_thread __attribute__((__no_sanitize_thread__))
#else
#define __no_sanitize_thread
#endif
#define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__))
/*
* Only supported since gcc >= 12
*/
#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
#define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__))
#else
#define __no_sanitize_coverage
#endif
/*
* Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel,
* matching the defines used by Clang.
*/
#ifdef __SANITIZE_HWADDRESS__
#define __SANITIZE_ADDRESS__
#endif
/*
* GCC does not support KMSAN.
*/
#define __no_sanitize_memory
#define __no_kmsan_checks
/*
* Turn individual warnings and errors on and off locally, depending
* on version.
*/
#define __diag_GCC(version, severity, s) \
__diag_GCC_ ## version(__diag_GCC_ ## severity s)
/* Severity used in pragma directives */
#define __diag_GCC_ignore ignored
#define __diag_GCC_warn warning
#define __diag_GCC_error error
#define __diag_str1(s) #s
#define __diag_str(s) __diag_str1(s)
#define __diag(s) _Pragma(__diag_str(GCC diagnostic s))
#if GCC_VERSION >= 80000
#define __diag_GCC_8(s) __diag(s)
#else
#define __diag_GCC_8(s)
#endif
#define __diag_ignore_all(option, comment) \
__diag(__diag_GCC_ignore option)
/*
* Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size"
* attribute) do not work, and must be disabled.
*/
#if GCC_VERSION < 90100
#undef __alloc_size__
#endif
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