168 lines
4.7 KiB
C
168 lines
4.7 KiB
C
/* 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_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
|