1*0d34bfa2Suebayasi/* $NetBSD: swapcontext.S,v 1.8 2014/05/23 02:34:19 uebayasi Exp $ */ 23fdac2b8Sthorpej 33fdac2b8Sthorpej/*- 43fdac2b8Sthorpej * Copyright (c) 1999 The NetBSD Foundation, Inc. 53fdac2b8Sthorpej * All rights reserved. 63fdac2b8Sthorpej * 73fdac2b8Sthorpej * This code is derived from software contributed to The NetBSD Foundation 83fdac2b8Sthorpej * by Klaus Klein. 93fdac2b8Sthorpej * 103fdac2b8Sthorpej * Redistribution and use in source and binary forms, with or without 113fdac2b8Sthorpej * modification, are permitted provided that the following conditions 123fdac2b8Sthorpej * are met: 133fdac2b8Sthorpej * 1. Redistributions of source code must retain the above copyright 143fdac2b8Sthorpej * notice, this list of conditions and the following disclaimer. 153fdac2b8Sthorpej * 2. Redistributions in binary form must reproduce the above copyright 163fdac2b8Sthorpej * notice, this list of conditions and the following disclaimer in the 173fdac2b8Sthorpej * documentation and/or other materials provided with the distribution. 183fdac2b8Sthorpej * 193fdac2b8Sthorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 203fdac2b8Sthorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 213fdac2b8Sthorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 223fdac2b8Sthorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 233fdac2b8Sthorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 243fdac2b8Sthorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 253fdac2b8Sthorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 263fdac2b8Sthorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 273fdac2b8Sthorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 283fdac2b8Sthorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 293fdac2b8Sthorpej * POSSIBILITY OF SUCH DAMAGE. 303fdac2b8Sthorpej */ 313fdac2b8Sthorpej 323fdac2b8Sthorpej#include <machine/asm.h> 333fdac2b8Sthorpej#if defined(LIBC_SCCS) && !defined(lint) 34*0d34bfa2Suebayasi RCSID("$NetBSD: swapcontext.S,v 1.8 2014/05/23 02:34:19 uebayasi Exp $") 353fdac2b8Sthorpej#endif /* LIBC_SCCS && !lint */ 363fdac2b8Sthorpej 373fdac2b8SthorpejENTRY(swapcontext) 383fdac2b8Sthorpej movl 4(%esp),%ecx 393fdac2b8Sthorpej PIC_PROLOGUE 403fdac2b8Sthorpej pushl %ecx /* push oucp */ 414d12bfcdSjoerg#ifdef __PIC__ 423b364b9bSkleink call PIC_PLT(_C_LABEL(_getcontext)) 433fdac2b8Sthorpej#else 443b364b9bSkleink call _C_LABEL(_getcontext) 453fdac2b8Sthorpej#endif 463fdac2b8Sthorpej addl $4,%esp /* pop oucp */ 473fdac2b8Sthorpej PIC_EPILOGUE 483fdac2b8Sthorpej testl %eax,%eax 493fdac2b8Sthorpej jnz 2f 503fdac2b8Sthorpej movl 4(%esp),%ecx 513fdac2b8Sthorpej movl 0(%esp),%edx 523fdac2b8Sthorpej movl %edx,(36 + 14 * 4)(%ecx) /* Adjust saved %eip ... */ 534d12bfcdSjoerg#ifdef __PIC__ 543fdac2b8Sthorpej movl %ebx,(36 + 8 * 4)(%ecx) /* ... clobbered PIC reg ... */ 553fdac2b8Sthorpej#endif 56e77f46b3Skleink leal 4(%esp),%edx 573a798554Sfvdl movl %edx,(36 + 17 * 4)(%ecx) /* ... and %esp. */ 583fdac2b8Sthorpej /* Note: oucp->%eax has been cleared by getcontext(). */ 593fdac2b8Sthorpej movl 8(%esp),%ecx 603fdac2b8Sthorpej PIC_PROLOGUE 613fdac2b8Sthorpej pushl %ecx /* push ucp */ 624d12bfcdSjoerg#ifdef __PIC__ 633fdac2b8Sthorpej call PIC_PLT(_C_LABEL(setcontext)) 643fdac2b8Sthorpej#else 653fdac2b8Sthorpej call _C_LABEL(setcontext) 663fdac2b8Sthorpej#endif 673fdac2b8Sthorpej addl $4,%esp /* pop ucp */ 683fdac2b8Sthorpej PIC_EPILOGUE 693fdac2b8Sthorpej /* No need to error-check: setcontext() must have failed. */ 703fdac2b8Sthorpej2: ret 71*0d34bfa2SuebayasiEND(swapcontext) 72