diff options
Diffstat (limited to 'contrib/llvm-project/compiler-rt/lib/builtins/arm/sync_synchronize.S')
| -rw-r--r-- | contrib/llvm-project/compiler-rt/lib/builtins/arm/sync_synchronize.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/arm/sync_synchronize.S b/contrib/llvm-project/compiler-rt/lib/builtins/arm/sync_synchronize.S new file mode 100644 index 000000000000..dd06e7191f9b --- /dev/null +++ b/contrib/llvm-project/compiler-rt/lib/builtins/arm/sync_synchronize.S @@ -0,0 +1,35 @@ +//===-- 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 + |