minix/lib/libc/arch/powerpc/gen/swapcontext.S
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

70 lines
2.7 KiB
ArmAsm

/* $NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 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"
#include "assym.h"
__RCSID("$NetBSD: swapcontext.S,v 1.7 2013/09/12 15:36:15 joerg Exp $")
#define XCALLFRAMELEN (((2+3)*SZREG + CALLFRAMELEN - 1) & -CALLFRAMELEN)
#define XCALLFRAME_R30 (XCALLFRAMELEN-1*SZREG)
#define XCALLFRAME_UCP (XCALLFRAMELEN-2*SZREG)
#define XCALLFRAME_OUCP (XCALLFRAMELEN-3*SZREG)
ENTRY(swapcontext)
stwu %r1,-XCALLFRAMELEN(%r1) # set up new stack frame
mflr %r0
stw %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1) # save link register
stw %r3,XCALLFRAME_OUCP(%r1) # must save oucp
stw %r4,XCALLFRAME_UCP(%r1) # must save ucp
#ifdef __PIC__
stw %r30,XCALLFRAME_R30(%r1) # must save r30
PIC_TOCSETUP(swapcontext,%r30) # setup toc pointer
#endif
bl PIC_PLT(_C_LABEL(_getcontext)) # getcontext(oucp)
cmpwi %r3,0
bne 1f
lwz %r11,XCALLFRAME_OUCP(%r1) # load oucp for adjustment
lwz %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1)
stw %r0,UC_GREGS_PC(%r11) # pc <- lr
addi %r0,%r1,XCALLFRAMELEN
stw %r0,UC_GREGS_R1(%r11) # adjust sp
lwz %r3,XCALLFRAME_UCP(%r1) # load ucp
bl PIC_PLT(_C_LABEL(setcontext)) # setcontext(ucp)
1:
lwz %r0,XCALLFRAMELEN+CALLFRAME_LR(%r1)
#ifdef __PIC__
lwz %r30,XCALLFRAME_R30(%r1)
#endif
mtlr %r0
addi %r1,%r1,XCALLFRAMELEN
blr
END(swapcontext)