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llvm-project/compiler-rt/lib/builtins/arm/sync_fetch_and_nand_4.S

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ARM: implement __sync_fetch_and_* operations Since these are primarily useful for deeply embedded targets where code size is very important, they are each in a separate file making use of infrastructure in sync-ops.h. This allows a linker to include just the functions that are actually used. rdar://problem/14736665 llvm-svn: 202812
2014-03-04 18:10:17 +08:00
/*===-- sync_fetch_and_nand_4.S - -----------------------------------------===//
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
*===----------------------------------------------------------------------===//
*
* This file implements the __sync_fetch_and_nand_4 function for the ARM
* architecture.
*
*===----------------------------------------------------------------------===*/
#include "sync-ops.h"
#define nand_4(rD, rN, rM) bic rD, rN, rM
SYNC_OP_4(nand_4)
builtins: tag with noexecstack These routines do not require executable stacks. However, by default ELFish linkers may assume an executable stack on GNUish environments (and some non-GNU ones too!). The GNU extension to add a note to indicate a non-executable stack is honoured by these environments to mark the stack as non-executable (the compiler normally emits this directive on appropriate targets whenever possible). This allows normal builds from getting executable stacks due to linking to the compiler rt builtins. llvm-svn: 273500
2016-06-23 06:09:42 +08:00
NO_EXEC_STACK_DIRECTIVE