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/* $NetBSD: SYS.h,v 1.19 2009/12/14 01:07:41 matt Exp $ */
/* $FreeBSD$ */
/*-
* Copyright (c) 1996 Jonathan Stone
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jonathan Stone for
* the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*/
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: @(#)SYS.h 8.1 (Berkeley) 6/4/93
*/
#include <sys/syscall.h>
#include <machine/asm.h>
/*
* If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops.
*
* i) Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after.
* ii) Do interprocedure jumps indirectly via t9, with the side-effect of
* preserving the callee's entry address in t9.
*/
#ifdef __ABICALLS__
.abicalls
# if defined(__mips_o32) || defined(__mips_o64)
# define PIC_PROLOGUE(x) SETUP_GP
# define PIC_TAILCALL(l) PTR_LA t9, _C_LABEL(l); jr t9
# define PIC_RETURN() j ra
# else
# define PIC_PROLOGUE(x) SETUP_GP64(t3, x)
# define PIC_TAILCALL(l) PTR_LA t9, _C_LABEL(l); RESTORE_GP64; jr t9
# define PIC_RETURN() RESTORE_GP64; j ra
# endif
#else
# define PIC_PROLOGUE(x)
# define PIC_TAILCALL(l) j _C_LABEL(l)
# define PIC_RETURN()
#endif /* __ABICALLS__ */
# define SYSTRAP(x) li v0,SYS_ ## x; syscall;
/*
* Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
*/
#define RSYSCALL_NOERROR(x) \
PSEUDO_NOERROR(x)
/*
* Do a normal syscall.
*/
#define RSYSCALL(x) \
PSEUDO(x)
/*
* Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
* and syscall name are not the same.
*/
#define PSEUDO_NOERROR(x) \
LEAF(__sys_ ## x); \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x)); \
.weak _C_LABEL(__CONCAT(_,x)); \
_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x)); \
SYSTRAP(x); \
j ra; \
END(__sys_ ## x)
#define PSEUDO(x) \
LEAF(__sys_ ## x); \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(__CONCAT(__sys_,x)); \
.weak _C_LABEL(__CONCAT(_,x)); \
_C_LABEL(__CONCAT(_,x)) = _C_LABEL(__CONCAT(__sys_,x)); \
PIC_PROLOGUE(__sys_ ## x); \
SYSTRAP(x); \
bne a3,zero,err; \
PIC_RETURN(); \
err: \
PIC_TAILCALL(__cerror); \
END(__sys_ ## x)
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