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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ident "%Z%%M% %I% %E% SMI"
#if defined(lint)
typedef long *jmp_buf_ptr;
#else /* lint */
#include <sys/asm_linkage.h>
#endif /* lint */
/*
* _setjmp(buf_ptr)
* buf_ptr points to a five word array (jmp_buf). In the first is our
* return address, the second, is the callers SP.
* The rest is cleared by _setjmp
*
* +----------------+
* %i0-> | pc |
* +----------------+
* | sp |
* +----------------+
* | sigmask |
* +----------------+
* | stagstack |
* | structure |
* +----------------+
*/
#if defined(lint)
/* ARGSUSED */
int
_setjmp(jmp_buf_ptr buf_ptr)
{ return (0); }
#else /* lint */
PCVAL = 0 ! offsets in buf structure
SPVAL = 4
SIGMASK = 8
SIGSTACK = 12
SS_SP = 0 ! offset in sigstack structure
SS_ONSTACK = 4
ENTRY(_setjmp)
st %o7, [%o0 + PCVAL] ! return pc
st %sp, [%o0 + SPVAL] ! save caller's sp
clr [%o0 + SIGMASK] ! clear the remainder of the jmp_buf
clr [%o0 + SIGSTACK + SS_SP]
clr [%o0 + SIGSTACK + SS_ONSTACK]
retl
clr %o0
SET_SIZE(_setjmp)
#endif /* lint */
/*
* _longjmp(buf_ptr, val)
* buf_ptr points to an array which has been initialized by _setjmp.
* val is the value we wish to return to _setjmp's caller
*
* We will flush our registers by doing (nwindows-1) save instructions.
* This could be better done as a kernel call. This is necessary to
* ensure that the registers we want to pick up are stored in the stack.
* Then, we set fp from the saved fp and make ourselves a stack frame.
*/
#if defined(lint)
/* ARGSUSED */
void
_longjmp(jmp_buf_ptr buf_ptr, int val)
{
return;
}
#else /* lint */
ENTRY(_longjmp)
save %sp, -WINDOWSIZE, %sp
!
! flush all register windows to the stack.
!
set nwindows, %g7
ld [%g7], %g7
sub %g7, 2, %g6
1:
deccc %g6 ! all windows done?
bnz 1b
save %sp, -WINDOWSIZE, %sp
sub %g7, 2, %g6
2:
deccc %g6 ! all windows done?
bnz 2b
restore ! delay slot, increment CWP
ld [%i0 + SPVAL], %fp ! build new stack frame
sub %fp, -SA(MINFRAME), %sp ! establish new save area
ld [%i0 + PCVAL], %i7 ! get new return pc
ret
restore %i1, 0, %o0 ! return (val)
SET_SIZE(_longjmp)
#endif /* lint */
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