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File: [cvs.NetBSD.org] / src / lib / libc / arch / riscv / SYS.h (download)

Revision 1.2, Fri Mar 27 06:44:28 2015 UTC (7 years, 8 months ago) by matt
Branch: MAIN
CVS Tags: prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan
Branch point for: phil-wifi
Changes since 1.1: +2 -2 lines

Switch to new ABI (return values now in a0/a1; v0/v1 are no more)

/*	$NetBSD: SYS.h,v 1.2 2015/03/27 06:44:28 matt Exp $ */

/*-
 * Copyright (c) 2014 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.
 *
 * 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; scall
#define	JUMP_TO_CERROR()	j	_C_LABEL(__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(y)							;\
	ret	/* error */						;\
	ret	/* success */						;\
	END(x)

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