44bebdfa56
LLVM's integrated assembler is always used for inline assembly with CONFIG_LTO_CLANG. Unlike gcc, LLVM considers each inline assembly block to be independent and therefore, any preambles that enable features must be included in each block. This change adds the necessary preamble to ARM64_LSE_ATOMIC_INSN to allow CONFIG_ARM64_LSE_ATOMICS to be enabled with LTO. Bug: 117299373 Change-Id: Icc06361dc2a2dba0f5f967d7f540cac2753b3e9c Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#ifndef __ASM_LSE_H
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#define __ASM_LSE_H
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#if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
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#include <linux/stringify.h>
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#include <asm/alternative.h>
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#ifdef __ASSEMBLER__
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.arch_extension lse
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.macro alt_lse, llsc, lse
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alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
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.endm
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#else /* __ASSEMBLER__ */
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#ifdef CONFIG_LTO_CLANG
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#define __LSE_PREAMBLE ".arch armv8-a+lse\n"
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#else
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__asm__(".arch_extension lse");
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#define __LSE_PREAMBLE
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#endif
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/* Move the ll/sc atomics out-of-line */
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#define __LL_SC_INLINE
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#define __LL_SC_PREFIX(x) __ll_sc_##x
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#define __LL_SC_EXPORT(x) EXPORT_SYMBOL(__LL_SC_PREFIX(x))
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/* Macro for constructing calls to out-of-line ll/sc atomics */
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#define __LL_SC_CALL(op) "bl\t" __stringify(__LL_SC_PREFIX(op)) "\n"
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#define __LL_SC_CLOBBERS "x16", "x17", "x30"
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/* In-line patching at runtime */
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
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ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
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#endif /* __ASSEMBLER__ */
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#else /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
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#ifdef __ASSEMBLER__
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.macro alt_lse, llsc, lse
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\llsc
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.endm
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#else /* __ASSEMBLER__ */
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#define __LL_SC_INLINE static inline
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#define __LL_SC_PREFIX(x) x
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#define __LL_SC_EXPORT(x)
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
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#endif /* __ASSEMBLER__ */
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#endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
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#endif /* __ASM_LSE_H */
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