/*      $OpenBSD: SYS.h,v 1.6 2023/12/11 22:29:24 deraadt Exp $ */

/*
 * Copyright (c) 2004 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     r12, =SYS_ ## x                                 ;\
99:     swi     0                                               ;\
        PINSYSCALL(SYS_ ## x, 99b)                              ;\
        dsb     nsh                                             ;\
        isb

#define DL_SYSCALL(n)                                           \
        .global         __CONCAT(_dl_,n)                        ;\
        .type           __CONCAT(_dl_,n)%function               ;\
__CONCAT(_dl_,n):                                               ;\
        SYSTRAP(n)                                              ;\
        bcs     .L_cerr                                         ;\
        mov     pc, lr

.L_cerr:
        rsb     r0, r0, #0              /* r0 = -errno */
        mov     pc, lr