minix/lib/nbsd_libc/arch/vax/gen/__setjmp14.S

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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
/* .asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93" */
.asciz "$NetBSD: __setjmp14.S,v 1.10 2005/05/03 04:37:33 matt Exp $"
#endif /* LIBC_SCCS and not lint */
/*
* C library -- setjmp, longjmp
*
* longjmp(a,v)
* will generate a "return(v)" from
* the last call to
* setjmp(a)
* by restoring registers from the stack,
* and a struct sigcontext, see <signal.h>
*/
#include "DEFS.h"
#include "assym.h"
ENTRY(__setjmp14, R6)
movl 4(%ap),%r2 # construct sigcontext
subl2 $12,%sp # space for current struct sigstack
pushl %sp # get current values
pushl $0 # no new values
calls $4,_C_LABEL(__sigaltstack14) # pop args plus signal stack value
movl 4(%ap),%r2 # construct sigcontext
movl (%sp)+,(%r2) # save onsigstack status of caller
pushal 28(%r2)
pushl $0
pushl $0
calls $3,_C_LABEL(__sigprocmask14) # get signal mask
addl3 $8,4(%ap),%r2 # point to sp in signal context
clrl %r0 # assume no stack arguments
bbc $13,6(%fp),1f # handle callg
addl3 $1,(%ap),%r0 # get argument count +1 if calls
1: moval 24(%fp)[%r0],(%r2)+ # save sp of caller
movl 12(%fp),(%r2)+ # save frame pointer of caller
movl 8(%fp),(%r2)+ # save argument pointer of caller
movl 16(%fp),(%r2)+ # save pc of caller
movpsl (%r2) # save current psl
movw 4(%fp),(%r2) # save psw of caller
#ifdef __ELF__
addl3 $SC_LEN,4(%ap),%r2 # point to past signal context
movq %r6,(%r2)+ # save r6/r7
movq %r8,(%r2)+ # save r8/r9
movq %r10,(%r2)+ # save r10/r11
#endif
clrl %r0
ret
#ifndef __ELF__
ENTRY(__longjmp14, 0)
movl 8(%ap),%r0 # return(v)
movl 4(%ap),%r1 # fetch buffer
tstl 12(%r1) # is fp non-null?
beql botch
#ifdef __ELF__
moval $SC_LEN(%r1),%r2 # get ptr to saved registers
movq (%r2)+,%r6 # restore r6/r7
movq (%r2)+,%r8 # restore r8/r9
movq (%r2)+,%r10 # restore r10/r11
#else
loop:
cmpl 12(%r1),%fp # are we there yet?
beql done
blssu botch
moval 20(%fp),%r2
blbc 6(%fp),1f # was %r0 saved?
movl %r0,(%r2)+
1:
bbc $1,6(%fp),2f # was %r1 saved?
movl %r1,(%r2)
2:
movab loop,16(%fp)
ret # pop another frame
done:
#endif /* !__ELF__ */
pushl %r1 # pointer to sigcontext
calls $1,_C_LABEL(__sigreturn14) # restore previous context
# we should never return
botch:
calls $0,_C_LABEL(longjmperror)
halt
#endif