swapcontext.S revision 1.5
1 1.5 matt /* $NetBSD: swapcontext.S,v 1.5 2011/01/15 07:31:12 matt Exp $ */ 2 1.2 thorpej 3 1.2 thorpej /*- 4 1.2 thorpej * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 1.2 thorpej * All rights reserved. 6 1.2 thorpej * 7 1.2 thorpej * This code is derived from software contributed to The NetBSD Foundation 8 1.2 thorpej * by Klaus Klein. 9 1.2 thorpej * 10 1.2 thorpej * Redistribution and use in source and binary forms, with or without 11 1.2 thorpej * modification, are permitted provided that the following conditions 12 1.2 thorpej * are met: 13 1.2 thorpej * 1. Redistributions of source code must retain the above copyright 14 1.2 thorpej * notice, this list of conditions and the following disclaimer. 15 1.2 thorpej * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 thorpej * notice, this list of conditions and the following disclaimer in the 17 1.2 thorpej * documentation and/or other materials provided with the distribution. 18 1.2 thorpej * 19 1.2 thorpej * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 thorpej * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 thorpej * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 thorpej * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 thorpej * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 thorpej * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 thorpej * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 thorpej * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 thorpej * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 thorpej * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 thorpej * POSSIBILITY OF SUCH DAMAGE. 30 1.2 thorpej */ 31 1.2 thorpej 32 1.2 thorpej #include "SYS.h" 33 1.5 matt #include "assym.h" 34 1.2 thorpej 35 1.5 matt __RCSID("$NetBSD: swapcontext.S,v 1.5 2011/01/15 07:31:12 matt Exp $") 36 1.5 matt 37 1.5 matt #define CALLFRAME_UCP (CALLFRAMELEN - 1*SZREG) 38 1.5 matt #define CALLFRAME_OUCP (CALLFRAMELEN - 2*SZREG) 39 1.2 thorpej 40 1.2 thorpej ENTRY(swapcontext) 41 1.5 matt stwu %r1,-CALLFRAMELEN(%r1) # set up new stack frame 42 1.3 kleink mflr %r0 43 1.5 matt stw %r0,CALLFRAMELEN+CALLFRAME_LR(%r1) # save link register 44 1.5 matt stw %r3,CALLFRAME_OUCP(%r1) # must save oucp 45 1.5 matt stw %r4,CALLFRAME_UCP(%r1) # must save ucp 46 1.2 thorpej bl PIC_PLT(_C_LABEL(_getcontext)) # getcontext(oucp) 47 1.3 kleink cmpwi %r3,0 48 1.2 thorpej bne 1f 49 1.5 matt lwz %r11,CALLFRAME_OUCP(%r1) # load oucp for adjustment 50 1.5 matt lwz %r0,CALLFRAMELEN+CALLFRAME_LR(%r1) 51 1.5 matt stw %r0,UC_GREGS_PC(%r11) # pc <- lr 52 1.5 matt addi %r0,%r1,CALLFRAMELEN 53 1.5 matt stw %r0,UC_GREGS_R1(%r11) # save adjusted sp 54 1.5 matt lwz %r3,CALLFRAME_UCP(%r1) # load ucp 55 1.2 thorpej bl PIC_PLT(_C_LABEL(setcontext)) # setcontext(ucp) 56 1.2 thorpej 1: 57 1.5 matt lwz %r0,CALLFRAMELEN+CALLFRAME_LR(%r1) 58 1.3 kleink mtlr %r0 59 1.5 matt addi %r1,%r1,CALLFRAMELEN 60 1.2 thorpej blr 61 1.5 matt END(swapcontext) 62
Indexes created Fri Oct 03 02:09:57 GMT 2025