/* $NetBSD: swapcontext.S,v 1.5 2014/08/13 15:41:21 joerg Exp $ */ /*- * Copyright (c) 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Klaus Klein. * * 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.h" #if defined(LIBC_SCCS) && !defined(lint) .text .asciz "$NetBSD: swapcontext.S,v 1.5 2014/08/13 15:41:21 joerg Exp $" #endif /* LIBC_SCCS && !lint */ ENTRY(swapcontext) mc_off = 56 # offset of uc_mcontext stdu %r1,-SF_SZ(%r1) # set up new stack frame mflr %r0 std %r0,(SF_SZ+SF_LR)(%r1) # save link register std %r3,SF_PARAM(%r1) # must save oucp (was 8) std %r4,SF_PARAM+8(%r1) # must save ucp (was 12) bl ._getcontext # getcontext(oucp) nop cmpdi %r3,0 bne 1f ld %r11,SF_PARAM(%r1) # load oucp for adjustment ld %r0,SF_SZ+SF_LR(%r1) # get LR back std %r0,mc_off+34*8(%r11) # pc <- lr la %r0,16(%r1) std %r0,mc_off+1*8(%r11) # adjust sp ld %r3,SF_PARAM+8(%r1) # load ucp bl PIC_PLT(_C_LABEL(setcontext)) # setcontext(ucp) nop 1: ld %r0,SF_SZ+SF_LR(%r1) mtlr %r0 la %r1,SF_SZ(%r1) blr