1*0b57cec5SDimitry Andric//===-- sync_synchronize - Implement memory barrier * ----------------------===// 2*0b57cec5SDimitry Andric// 3*0b57cec5SDimitry Andric// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric// See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric// 7*0b57cec5SDimitry Andric//===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric 9*0b57cec5SDimitry Andric#include "../assembly.h" 10*0b57cec5SDimitry Andric 11*0b57cec5SDimitry Andric// When compiling a use of the gcc built-in __sync_synchronize() in thumb1 mode 12*0b57cec5SDimitry Andric// the compiler may emit a call to __sync_synchronize. 13*0b57cec5SDimitry Andric// On Darwin the implementation jumps to an OS supplied function named 14*0b57cec5SDimitry Andric// OSMemoryBarrier 15*0b57cec5SDimitry Andric 16*0b57cec5SDimitry Andric .text 17*0b57cec5SDimitry Andric .syntax unified 18*0b57cec5SDimitry Andric 19*0b57cec5SDimitry Andric#if __APPLE__ 20*0b57cec5SDimitry Andric 21*0b57cec5SDimitry Andric .p2align 2 22*0b57cec5SDimitry AndricDEFINE_COMPILERRT_PRIVATE_FUNCTION(__sync_synchronize) 23*0b57cec5SDimitry Andric stmfd sp!, {r7, lr} 24*0b57cec5SDimitry Andric add r7, sp, #0 25*0b57cec5SDimitry Andric bl _OSMemoryBarrier 26*0b57cec5SDimitry Andric ldmfd sp!, {r7, pc} 27*0b57cec5SDimitry AndricEND_COMPILERRT_FUNCTION(__sync_synchronize) 28*0b57cec5SDimitry Andric 29*0b57cec5SDimitry Andric // tell linker it can break up file at label boundaries 30*0b57cec5SDimitry Andric .subsections_via_symbols 31*0b57cec5SDimitry Andric 32*0b57cec5SDimitry Andric#endif 33*0b57cec5SDimitry Andric 34*0b57cec5SDimitry AndricNO_EXEC_STACK_DIRECTIVE 35*0b57cec5SDimitry Andric 36