| 1 | //===-- sync_synchronize - Implement memory barrier * ----------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "../assembly.h" |
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| 10 | |
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| 11 | // When compiling a use of the gcc built-in __sync_synchronize() in thumb1 mode |
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| 12 | // the compiler may emit a call to __sync_synchronize. |
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| 13 | // On Darwin the implementation jumps to an OS supplied function named |
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| 14 | // OSMemoryBarrier |
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| 15 | |
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| 16 | .text |
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| 17 | .syntax unified |
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| 18 | |
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| 19 | #if __APPLE__ |
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| 20 | |
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| 21 | .p2align 2 |
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| 22 | DEFINE_COMPILERRT_PRIVATE_FUNCTION(__sync_synchronize) |
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| 23 | stmfd sp!, {r7, lr} |
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| 24 | add r7, sp, #0 |
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| 25 | bl _OSMemoryBarrier |
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| 26 | ldmfd sp!, {r7, pc} |
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| 27 | END_COMPILERRT_FUNCTION(__sync_synchronize) |
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| 28 | |
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| 29 | // tell linker it can break up file at label boundaries |
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| 30 | .subsections_via_symbols |
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| 31 | |
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| 32 | #endif |
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| 33 | |
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| 34 | NO_EXEC_STACK_DIRECTIVE |
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| 35 | |
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| 36 | |
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