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148 lines
4.2 KiB
148 lines
4.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_COMPILER_TYPES_H |
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#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead." |
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#endif |
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/* |
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* Common definitions for all gcc versions go here. |
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*/ |
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#define GCC_VERSION (__GNUC__ * 10000 \ |
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+ __GNUC_MINOR__ * 100 \ |
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+ __GNUC_PATCHLEVEL__) |
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/* |
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* This macro obfuscates arithmetic on a variable address so that gcc |
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* shouldn't recognize the original var, and make assumptions about it. |
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* |
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* This is needed because the C standard makes it undefined to do |
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* pointer arithmetic on "objects" outside their boundaries and the |
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* gcc optimizers assume this is the case. In particular they |
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* assume such arithmetic does not wrap. |
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* |
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* A miscompilation has been observed because of this on PPC. |
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* To work around it we hide the relationship of the pointer and the object |
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* using this macro. |
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* |
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* Versions of the ppc64 compiler before 4.1 had a bug where use of |
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* RELOC_HIDE could trash r30. The bug can be worked around by changing |
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* the inline assembly constraint from =g to =r, in this particular |
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* case either is valid. |
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*/ |
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#define RELOC_HIDE(ptr, off) \ |
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({ \ |
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unsigned long __ptr; \ |
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__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ |
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(typeof(ptr)) (__ptr + (off)); \ |
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}) |
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#ifdef CONFIG_RETPOLINE |
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#define __noretpoline __attribute__((__indirect_branch__("keep"))) |
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#endif |
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) |
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#if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__) |
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#define __latent_entropy __attribute__((latent_entropy)) |
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#endif |
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/* |
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* calling noreturn functions, __builtin_unreachable() and __builtin_trap() |
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* confuse the stack allocation in gcc, leading to overly large stack |
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* frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365 |
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* |
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* Adding an empty inline assembly before it works around the problem |
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*/ |
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#define barrier_before_unreachable() asm volatile("") |
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/* |
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* Mark a position in code as unreachable. This can be used to |
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* suppress control flow warnings after asm blocks that transfer |
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* control elsewhere. |
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*/ |
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#define unreachable() \ |
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do { \ |
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annotate_unreachable(); \ |
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barrier_before_unreachable(); \ |
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__builtin_unreachable(); \ |
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} while (0) |
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) |
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#define __HAVE_BUILTIN_BSWAP32__ |
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#define __HAVE_BUILTIN_BSWAP64__ |
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#define __HAVE_BUILTIN_BSWAP16__ |
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#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |
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#if GCC_VERSION >= 70000 |
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#define KASAN_ABI_VERSION 5 |
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#else |
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#define KASAN_ABI_VERSION 4 |
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#endif |
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#ifdef CONFIG_SHADOW_CALL_STACK |
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#define __noscs __attribute__((__no_sanitize__("shadow-call-stack"))) |
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#endif |
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#if __has_attribute(__no_sanitize_address__) |
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#define __no_sanitize_address __attribute__((no_sanitize_address)) |
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#else |
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#define __no_sanitize_address |
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#endif |
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#if defined(__SANITIZE_THREAD__) && __has_attribute(__no_sanitize_thread__) |
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#define __no_sanitize_thread __attribute__((no_sanitize_thread)) |
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#else |
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#define __no_sanitize_thread |
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#endif |
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#if __has_attribute(__no_sanitize_undefined__) |
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#define __no_sanitize_undefined __attribute__((no_sanitize_undefined)) |
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#else |
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#define __no_sanitize_undefined |
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#endif |
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#if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__) |
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#define __no_sanitize_coverage __attribute__((no_sanitize_coverage)) |
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#else |
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#define __no_sanitize_coverage |
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#endif |
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/* |
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* Treat __SANITIZE_HWADDRESS__ the same as __SANITIZE_ADDRESS__ in the kernel, |
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* matching the defines used by Clang. |
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*/ |
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#ifdef __SANITIZE_HWADDRESS__ |
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#define __SANITIZE_ADDRESS__ |
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#endif |
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/* |
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* Turn individual warnings and errors on and off locally, depending |
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* on version. |
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*/ |
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#define __diag_GCC(version, severity, s) \ |
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__diag_GCC_ ## version(__diag_GCC_ ## severity s) |
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/* Severity used in pragma directives */ |
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#define __diag_GCC_ignore ignored |
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#define __diag_GCC_warn warning |
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#define __diag_GCC_error error |
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#define __diag_str1(s) #s |
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#define __diag_str(s) __diag_str1(s) |
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#define __diag(s) _Pragma(__diag_str(GCC diagnostic s)) |
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#if GCC_VERSION >= 80000 |
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#define __diag_GCC_8(s) __diag(s) |
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#else |
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#define __diag_GCC_8(s) |
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#endif |
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#define __diag_ignore_all(option, comment) \ |
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__diag_GCC(8, ignore, option) |
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/* |
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* Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size" |
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* attribute) do not work, and must be disabled. |
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*/ |
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#if GCC_VERSION < 90100 |
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#undef __alloc_size__ |
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#endif
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