/*	$OpenBSD: SYS.h,v 1.4 2023/12/11 22:29:25 deraadt Exp $ */

/*
 * Copyright (c) 2006 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

#ifdef __ASSEMBLER__
/*
 * If the system call number fits in a 8-bit signed value (i.e. fits in 7 bits),
 * then we can use the #imm8 addressing mode.
 */

.macro systrap num
.iflt \num - 128
	mov	# \num, r0
99:	trapa	#0x80
	PINSYSCALL(\num, 99b)
.else
	mov.l	903f, r0
99:	trapa	#0x80
	PINSYSCALL(\num, 99b)
	bra	904f
	 nop
	.align	2
 903:	.long	\num
 904:
.endif
.endm
#endif

#define SYSTRAP(x)						\
	systrap	SYS_ ## x

#define DL_SYSCALL(n)						\
	.global		__CONCAT(_dl_,n)			;\
	.type		__CONCAT(_dl_,n)%function		;\
__CONCAT(_dl_,n):						;\
	SYSTRAP(n)						;\
	bf	.L_cerr						;\
	 nop							;\
	rts							;\
	 nop

.L_cerr:
	neg	r0, r0
	rts
	 nop