* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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#if defined(LIBC_SCCS) && !defined(lint)
.asciz "@(#)sigsetjmp.s 8.1 (Berkeley) 5/3/95"
#endif /* LIBC_SCCS and not lint */
* C library -- sigsetjmp, siglongjmp
* will generate a "return(v)" from
* by restoring registers from the stack,
* and a struct sigcontext, see <signal.h>
#define _JBLEN 17 /* XXX from <setjmp.h> */
tstl sp@(8) /* save signal mask? */
beq _setjmp /* do _setjmp */
movl #_JBLEN,d0 /* last entry in jmpbuf */
asll #2,d0 /* scale to long ptr */
movl sp@(4),a0 /* save area pointer */
addl d0,a0 /* &jmpbuf[_JBLEN] */
movl sp@(8),a0@ /* jmpbuf[_JBLEN] = savemask */
bra setjmp /* do setjmp */
movl sp@(4),a0 /* save area pointer */
clrl a0@+ /* no old onstack */
clrl a0@+ /* no old sigmask */
movl sp,a0@+ /* save old SP */
movl a6,a0@+ /* save old FP */
clrl a0@+ /* no old AP */
movl sp@,a0@+ /* save old PC */
moveml #0x3CFC,a0@ /* save other non-scratch regs */
clrl d0 /* return zero */
subl #12,sp /* space for sigaltstack args/rvals */
clrl sp@ /* don't change it... */
movl sp,sp@(4) /* ...but return the current val */
jsr _sigaltstack /* note: onstack returned in sp@(8) */
clrl sp@ /* don't change mask, just return */
jsr _sigblock /* old value */
movl sp@(8),d1 /* old onstack value */
andl #1,d1 /* extract onstack flag */
movl sp@(4),a0 /* save area pointer */
movl d1,a0@+ /* save old onstack value */
movl d0,a0@+ /* save old signal mask */
lea sp@(4),a1 /* adjust saved SP since we won't rts */
movl a1,a0@+ /* save old SP */
movl a6,a0@+ /* save old FP */
movl sp@,a0@+ /* save old PC */
moveml #0x3CFC,a0@ /* save remaining non-scratch regs */
movl #_JBLEN,d0 /* last entry in jmpbuf */
asll #2,d0 /* scale to long ptr */
movl sp@(4),a0 /* save area pointer */
addl d0,a0 /* &jmpbuf[_JBLEN] */
tstl a0@ /* if jmpbuf[_JBLEN] */
bne longjmp /* do longjmp */
movl sp@(4),a0 /* save area pointer */
addql #8,a0 /* skip onstack/sigmask */
tstl a0@ /* ensure non-zero SP */
movl sp@(8),d0 /* grab return value */
moveq #1,d0 /* else make non-zero */
movl a0@+,sp /* restore SP */
movl a0@+,a6 /* restore FP */
addql #4,a0 /* skip AP */
movl a0@+,sp@ /* restore PC */
moveml a0@(4),#0x3CFC /* restore non-scratch regs */
movl sp@(4),a0 /* save area pointer */
tstl a0@(8) /* ensure non-zero SP */
movl sp@(8),d0 /* grab return value */
jne good /* non-zero good */
moveq #1,d0 /* else make non-zero */
moveml a0@(28),#0x3CFC /* restore non-scratch regs */
movl a0,sp@- /* let sigreturn */
jsr _sigreturn /* finish for us */