| //===-- sync_synchronize - Implement memory barrier * ----------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "../assembly.h" |
| |
| // When compiling a use of the gcc built-in __sync_synchronize() in thumb1 mode |
| // the compiler may emit a call to __sync_synchronize. |
| // On Darwin the implementation jumps to an OS supplied function named |
| // OSMemoryBarrier |
| |
| .text |
| .syntax unified |
| |
| #if __APPLE__ |
| |
| .p2align 2 |
| DEFINE_COMPILERRT_PRIVATE_FUNCTION(__sync_synchronize) |
| stmfd sp!, {r7, lr} |
| add r7, sp, #0 |
| bl _OSMemoryBarrier |
| ldmfd sp!, {r7, pc} |
| END_COMPILERRT_FUNCTION(__sync_synchronize) |
| |
| // tell linker it can break up file at label boundaries |
| .subsections_via_symbols |
| |
| #endif |
| |
| NO_EXEC_STACK_DIRECTIVE |
| |
