b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
71 lines
2.5 KiB
ArmAsm
71 lines
2.5 KiB
ArmAsm
/* $NetBSD: swapcontext.S,v 1.6 2008/04/28 20:22:56 martin Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: swapcontext.S,v 1.6 2008/04/28 20:22:56 martin Exp $")
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#endif /* LIBC_SCCS && !lint */
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ENTRY(swapcontext)
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movl 4(%esp),%ecx
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PIC_PROLOGUE
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pushl %ecx /* push oucp */
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#ifdef PIC
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call PIC_PLT(_C_LABEL(_getcontext))
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#else
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call _C_LABEL(_getcontext)
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#endif
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addl $4,%esp /* pop oucp */
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PIC_EPILOGUE
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testl %eax,%eax
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jnz 2f
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movl 4(%esp),%ecx
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movl 0(%esp),%edx
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movl %edx,(36 + 14 * 4)(%ecx) /* Adjust saved %eip ... */
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#ifdef PIC
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movl %ebx,(36 + 8 * 4)(%ecx) /* ... clobbered PIC reg ... */
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#endif
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leal 4(%esp),%edx
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movl %edx,(36 + 17 * 4)(%ecx) /* ... and %esp. */
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/* Note: oucp->%eax has been cleared by getcontext(). */
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movl 8(%esp),%ecx
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PIC_PROLOGUE
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pushl %ecx /* push ucp */
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#ifdef PIC
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call PIC_PLT(_C_LABEL(setcontext))
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#else
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call _C_LABEL(setcontext)
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#endif
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addl $4,%esp /* pop ucp */
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PIC_EPILOGUE
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/* No need to error-check: setcontext() must have failed. */
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2: ret
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