forked from mirrors/linux
e6f3b3c9c1
Clang 14 added support for the __builtin_function_start function,
which allows us to implement the function_nocfi macro without
architecture-specific inline assembly and in a way that also works
with static initializers.
Change CONFIG_CFI_CLANG to depend on Clang >= 14, define
function_nocfi using __builtin_function_start, and remove the arm64
inline assembly implementation.
Link: ec2e26eaf6
Link: https://github.com/ClangBuiltLinux/linux/issues/1353
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Will Deacon <will@kernel.org> # arm64
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220405221618.633743-1-samitolvanen@google.com
105 lines
3.2 KiB
C
105 lines
3.2 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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/* Compiler specific definitions for Clang compiler */
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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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/*
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* Note: Checking __has_feature(*_sanitizer) is only true if the feature is
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* enabled. Therefore it is not required to additionally check defined(CONFIG_*)
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* to avoid adding redundant attributes in other configurations.
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*/
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#if __has_feature(address_sanitizer) || __has_feature(hwaddress_sanitizer)
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/* Emulate GCC's __SANITIZE_ADDRESS__ flag */
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#define __SANITIZE_ADDRESS__
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#define __no_sanitize_address \
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__attribute__((no_sanitize("address", "hwaddress")))
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#else
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#define __no_sanitize_address
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#endif
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#if __has_feature(thread_sanitizer)
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/* emulate gcc's __SANITIZE_THREAD__ flag */
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#define __SANITIZE_THREAD__
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#define __no_sanitize_thread \
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__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 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 __has_feature(undefined_behavior_sanitizer)
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/* GCC does not have __SANITIZE_UNDEFINED__ */
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#define __no_sanitize_undefined \
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__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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/*
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* Support for __has_feature(coverage_sanitizer) was added in Clang 13 together
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* with no_sanitize("coverage"). Prior versions of Clang support coverage
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* instrumentation, but cannot be queried for support by the preprocessor.
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*/
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#if __has_feature(coverage_sanitizer)
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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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#if __has_feature(shadow_call_stack)
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# define __noscs __attribute__((__no_sanitize__("shadow-call-stack")))
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#endif
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#define __nocfi __attribute__((__no_sanitize__("cfi")))
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#define __cficanonical __attribute__((__cfi_canonical_jump_table__))
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#if defined(CONFIG_CFI_CLANG)
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/*
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* With CONFIG_CFI_CLANG, the compiler replaces function address
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* references with the address of the function's CFI jump table
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* entry. The function_nocfi macro always returns the address of the
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* actual function instead.
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*/
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#define function_nocfi(x) __builtin_function_start(x)
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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_clang(version, severity, s) \
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__diag_clang_ ## version(__diag_clang_ ## severity s)
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/* Severity used in pragma directives */
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#define __diag_clang_ignore ignored
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#define __diag_clang_warn warning
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#define __diag_clang_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(clang diagnostic s))
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#if CONFIG_CLANG_VERSION >= 110000
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#define __diag_clang_11(s) __diag(s)
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#else
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#define __diag_clang_11(s)
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#endif
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#define __diag_ignore_all(option, comment) \
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__diag_clang(11, ignore, option)
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