Differential D14609 Diff 47901 lib/libsys/aarch64/SYS.h

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lib/libsys/aarch64/SYS.h

This file was copied from lib/libc/aarch64/sys/syscall.S.

	/*-			/*-
	* Copyright (c) 2014 The FreeBSD Foundation			* Copyright (c) 2014 Andrew Turner
				* Copyright (c) 2015 The FreeBSD Foundation
	* All rights reserved.			* All rights reserved.
	*			*
	* This software was developed by Andrew Turner under			* This software was developed by Andrew Turner under
	* sponsorship from the FreeBSD Foundation.			* sponsorship from the FreeBSD Foundation.
	*			*
	* Redistribution and use in source and binary forms, with or without			* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions			* modification, are permitted provided that the following conditions
	* are met:			* are met:
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	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.			* SUCH DAMAGE.
				*
				* $FreeBSD$
	*/			*/

				#include <sys/syscall.h>
	#include <machine/asm.h>			#include <machine/asm.h>
	__FBSDID("$FreeBSD$");

	#include "SYS.h"			#define _SYSCALL(name) \
				mov x8, SYS_ ## name; \
				svc 0

	RSYSCALL(syscall)			#define SYSCALL(name) \
				ENTRY(__sys_##name); \
				WEAK_REFERENCE(__sys_##name, name); \
				WEAK_REFERENCE(__sys_##name, _##name); \
				_SYSCALL(name); \
				ret; \
				END(__sys_##name)

				/*
				* Conditional jumps can only go up to one megabyte in either
				* direction, and cerror can be located anywhere, so we have
				* to jump around to use more capable unconditional branch
				* instruction.
				*/
				#define PSEUDO(name) \
				ENTRY(__sys_##name); \
				WEAK_REFERENCE(__sys_##name, _##name); \
				_SYSCALL(name); \
				b.cs 1f; \
				ret; \
				1: b cerror; \
				END(__sys_##name)

				#define RSYSCALL(name) \
				ENTRY(__sys_##name); \
				WEAK_REFERENCE(__sys_##name, name); \
				WEAK_REFERENCE(__sys_##name, _##name); \
				_SYSCALL(name); \
				b.cs 1f; \
				ret; \
				1: b cerror; \
				END(__sys_##name)