minix/lib/libc/arch/sparc/gen/setjmp.S

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/* $NetBSD: setjmp.S,v 1.11 2007/10/08 13:06:00 uwe Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
*
* from: Header: setjmp.s,v 1.2 92/06/25 03:18:43 torek Exp
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
.asciz "@(#)setjmp.s 8.1 (Berkeley) 6/4/93"
#else
RCSID("$NetBSD: setjmp.S,v 1.11 2007/10/08 13:06:00 uwe Exp $")
#endif
#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 "SYS.h"
ENTRY(__setjmp14)
save %sp, -CCFSZ, %sp
/*
* local vars on stack: struct sigstack foo @ offset 0x48
* Note: sc_g1 is not used; sc_o0 is set in longjmp()
*/
mov 1, %o0 /* SIG_BLOCK */
add %i0, 32, %o2 /* build sigcontext sc.sc_mask */
call _C_LABEL(__sigprocmask14)
clr %o1 /* sigprocmask(SIG_BLOCK, NULL, &sc.sc_mask) */
add %sp, 0x48, %o1 /* (foo being in arg dump area) */
call _C_LABEL(__sigaltstack14)
clr %o0 /* sigstack(NULL, &foo) */
ld [%sp + 0x48 + 8], %o0 /* foo.ss_flags */
and %o0, 1, %o1 /* onstack = foo.ss_flags & 1; */
st %o1, [%i0 + 0] /* sc.sc_onstack = current onstack; */
st %fp, [%i0 + 8] /* sc.sc_sp = (caller's) sp */
add %i7, 8, %o0
st %o0, [%i0 + 12] /* sc.sc_pc = return_pc */
add %i7, 12, %o0
st %o0, [%i0 + 16] /* sc.sc_npc = return_pc + 4 */
st %g0, [%i0 + 20] /* sc.sc_psr = (clean psr) */
ret /* return 0 */
restore %g0, %g0, %o0