swapcontext.S revision 1.3.8.2
1 1.3.8.2 martin /* $NetBSD: swapcontext.S,v 1.3.8.2 2008/04/28 20:22:58 martin Exp $ */ 2 1.3.8.2 martin 3 1.3.8.2 martin /*- 4 1.3.8.2 martin * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.3.8.2 martin * All rights reserved. 6 1.3.8.2 martin * 7 1.3.8.2 martin * This code is derived from software contributed to The NetBSD Foundation 8 1.3.8.2 martin * by Klaus Klein. 9 1.3.8.2 martin * 10 1.3.8.2 martin * Redistribution and use in source and binary forms, with or without 11 1.3.8.2 martin * modification, are permitted provided that the following conditions 12 1.3.8.2 martin * are met: 13 1.3.8.2 martin * 1. Redistributions of source code must retain the above copyright 14 1.3.8.2 martin * notice, this list of conditions and the following disclaimer. 15 1.3.8.2 martin * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.8.2 martin * notice, this list of conditions and the following disclaimer in the 17 1.3.8.2 martin * documentation and/or other materials provided with the distribution. 18 1.3.8.2 martin * 19 1.3.8.2 martin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.8.2 martin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.8.2 martin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.8.2 martin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.8.2 martin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.8.2 martin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.8.2 martin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.8.2 martin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.8.2 martin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.8.2 martin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.8.2 martin * POSSIBILITY OF SUCH DAMAGE. 30 1.3.8.2 martin */ 31 1.3.8.2 martin 32 1.3.8.2 martin #include "SYS.h" 33 1.3.8.2 martin 34 1.3.8.2 martin #if defined(LIBC_SCCS) && !defined(lint) 35 1.3.8.2 martin .text 36 1.3.8.2 martin .asciz "$NetBSD: swapcontext.S,v 1.3.8.2 2008/04/28 20:22:58 martin Exp $" 37 1.3.8.2 martin #endif /* LIBC_SCCS && !lint */ 38 1.3.8.2 martin 39 1.3.8.2 martin ENTRY(swapcontext) 40 1.3.8.2 martin mc_off = 56 # offset of uc_mcontext 41 1.3.8.2 martin stdu %r1,-SF_SZ(%r1) # set up new stack frame 42 1.3.8.2 martin mflr %r0 43 1.3.8.2 martin std %r0,[SF_SZ+SF_LR](%r1) # save link register 44 1.3.8.2 martin std %r3,SF_PARAM(%r1) # must save oucp (was 8) 45 1.3.8.2 martin std %r4,SF_PARAM+8(%r1) # must save ucp (was 12) 46 1.3.8.2 martin bl ._getcontext # getcontext(oucp) 47 1.3.8.2 martin nop 48 1.3.8.2 martin cmpdi %r3,0 49 1.3.8.2 martin bne 1f 50 1.3.8.2 martin ld %r11,SF_PARAM(%r1) # load oucp for adjustment 51 1.3.8.2 martin ld %r0,SF_SZ+SF_LR(%r1) # get LR back 52 1.3.8.2 martin std %r0,mc_off+34*8(%r11) # pc <- lr 53 1.3.8.2 martin la %r0,16(%r1) 54 1.3.8.2 martin std %r0,mc_off+1*8(%r11) # adjust sp 55 1.3.8.2 martin ld %r3,SF_PARAM+8(%r1) # load ucp 56 1.3.8.2 martin bl .setcontext # setcontext(ucp) 57 1.3.8.2 martin nop 58 1.3.8.2 martin 1: 59 1.3.8.2 martin ld %r0,SF_SZ+SF_LR(%r1) 60 1.3.8.2 martin mtlr %r0 61 1.3.8.2 martin la %r1,SF_SZ(%r1) 62 1.3.8.2 martin blr 63
Indexes created Thu Oct 09 07:10:06 GMT 2025