/*      $NetBSD: SYS.h,v 1.5 2023/05/19 06:41:41 skrll Exp $ */

/*-
* Copyright (c) 2014,2022 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry, and Nick Hudson.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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 <sys/syscall.h>
#include <machine/asm.h>

#define SYSTRAP(x)                                                      \
       li      t6, SYS_ ## x;                                          \
       ecall

#define JUMP_TO_CERROR()                                                \
       .option push                                                    ;\
       .option norelax                                                 ;\
       tail    _C_LABEL(__cerror)                                      ;\
       .option pop

#define SYSTRAP_NOERROR(x)                                              \
       SYSTRAP(x)                                                      ;\
       nop; nop                /* size of ...                  */      ;\
       nop; nop                /*     JUMP_TO_CERROR           */      ;\

/*
* Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
*/
#define RSYSCALL_NOERROR(x)                                             \
       PSEUDO_NOERROR(x,x)

/*
* Do a normal syscall.
*/
#define RSYSCALL(x)                                                     \
       PSEUDO(x,x)

/*
* Do a syscall that has an internal name and a weak external alias.
*/
#define WSYSCALL(weak,strong)                                           \
       WEAK_ALIAS(weak,strong)                                         ;\
       PSEUDO(strong,weak)

/*
* Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
* and syscall name are not the same.
*/
#define PSEUDO_NOERROR(x,y)                                             \
ENTRY(x)                                                                ;\
       SYSTRAP_NOERROR(y)                                              ;\
       ret                     /* success */                           ;\
END(x)

#define PSEUDO(x,y)                                                     \
ENTRY(x)                                                                ;\
       SYSTRAP(y)                                                      ;\
       JUMP_TO_CERROR()        /* error */                             ;\
       ret                     /* success */                           ;\
END(x)

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