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/* $OpenBSD: SYS.h,v 1.7 2023/12/11 22:29:23 deraadt Exp $ */
/*
* Copyright (c) 2016 Dale Rahn
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* 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
* SUCH DAMAGE.
*
*/
#include <machine/asm.h>
#include <sys/syscall.h>
#define PINSYSCALL(sysno, label) \
.pushsection .openbsd.syscalls,"",@progbits ;\
.p2align 2 ;\
.long label ;\
.long sysno ;\
.popsection
#define SYSTRAP(x) \
ldr x8, =SYS_ ## x ;\
99: svc 0 ;\
PINSYSCALL(SYS_ ## x, 99b) ;\
dsb nsh ;\
isb
#define DL_SYSCALL(n) \
.global __CONCAT(_dl_,n) ;\
.type __CONCAT(_dl_,n)%function ;\
__CONCAT(_dl_,n): ;\
RETGUARD_SETUP(__CONCAT(_dl_,n), x15) ;\
SYSTRAP(n) ;\
cneg x0, x0, cs /* r0 = -errno */ ;\
RETGUARD_CHECK(__CONCAT(_dl_,n), x15) ;\
ret
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