132 lines
4.9 KiB
C
132 lines
4.9 KiB
C
/* $NetBSD: SYS.h,v 1.8 1997/03/15 08:52:16 jonathan Exp $ */
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/*-
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* Copyright (c) 1996 Jonathan STone
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Jonathan Stone for
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* the NetBSD Project.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ralph Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)SYS.h 8.1 (Berkeley) 6/4/93
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*/
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#include <sys/syscall.h>
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#include <machine/machAsmDefs.h>
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/*
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* If compiling for shared libs, Emit sysV ABI PIC segment pseudo-ops.
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*
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* i) Emit .abicalls before .LEAF entrypoint, and .cpload/.cprestore after.
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* ii) Do interprocedure jumps indirectly via t9, with the side-effect of
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* preserving the callee's entry address in t9.
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*/
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#ifdef ABICALLS
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# define PIC_LEAF(x,sr) \
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.abicalls; LEAF(x); .set noreorder; .cpload sr; .set reorder
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# define PIC_CALL(l,sr) la sr, _C_LABEL(l); jr sr
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#else
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# define PIC_LEAF(x,sr) LEAF(x)
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# define PIC_CALL(l,sr) j _C_LABEL(l)
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#endif
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#ifdef __STDC__
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# define SYSTRAP(x) li v0,SYS_ ## x; syscall;
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#else
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# define SYSTRAP(x) li v0,SYS_/**/x; syscall;
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#endif
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/*
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* Helper macro: produce a possibly-PIC entry point 'x' that syscalls 'y'.
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*/
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#define PIC_SYSTRAP(x,y) \
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PIC_LEAF(x,t9); \
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SYSTRAP(y)
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/*
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* Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id)
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*/
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#define RSYSCALL_NOERROR(x) \
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PIC_SYSTRAP(x,x); \
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j ra; \
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END(x)
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/*
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* Do a normal syscall.
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*/
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#define RSYSCALL(x) \
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PSEUDO(x,x)
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/*
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* Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint
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* and syscall name are not the same.
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*/
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#define PSEUDO(x,y) \
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PIC_SYSTRAP(x,y); \
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bne a3,zero,err; j ra; \
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err: PIC_CALL(cerror,t9); \
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END(x)
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