db226f7ba8
This change adds the CONFIG_CFI_CLANG option, CFI error handling, and a faster look-up table for cross module CFI checks. Bug: 67506682 Change-Id: Ic009f0a629b552a0eb16e6d89808c7029e91447d Signed-off-by: Sami Tolvanen <samitolvanen@google.com> [AmitP: Rebased to newer kernels without clang LTO support] Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/* 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-clang.h> directly, include <linux/compiler.h> instead."
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#endif
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/* Some compiler specific definitions are overwritten here
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* for Clang compiler
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*/
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#define uninitialized_var(x) x = *(&(x))
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/* same as gcc, this was present in clang-2.6 so we can assume it works
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* with any version that can compile the kernel
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*/
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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/* all clang versions usable with the kernel support KASAN ABI version 5 */
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#define KASAN_ABI_VERSION 5
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/* emulate gcc's __SANITIZE_ADDRESS__ flag */
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#if __has_feature(address_sanitizer)
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#define __SANITIZE_ADDRESS__
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#endif
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#define __no_sanitize_address __attribute__((no_sanitize("address")))
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/*
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* Not all versions of clang implement the the type-generic versions
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* of the builtin overflow checkers. Fortunately, clang implements
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* __has_builtin allowing us to avoid awkward version
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* checks. Unfortunately, we don't know which version of gcc clang
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* pretends to be, so the macro may or may not be defined.
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*/
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#if __has_builtin(__builtin_mul_overflow) && \
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__has_builtin(__builtin_add_overflow) && \
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__has_builtin(__builtin_sub_overflow)
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#define COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW 1
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#endif
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/* The following are for compatibility with GCC, from compiler-gcc.h,
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* and may be redefined here because they should not be shared with other
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* compilers, like ICC.
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*/
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#define barrier() __asm__ __volatile__("" : : : "memory")
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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#define __assume_aligned(a, ...) \
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__attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
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#ifdef CONFIG_CFI_CLANG
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#define __nocfi __attribute__((no_sanitize("cfi")))
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#endif
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