minix/lib/nbsd_libc/arch/m68k/gen/setjmp.S

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/* $NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos Exp $ */
/*-
* Copyright (c) 1990 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
* Science Department.
*
* 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.
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
RCSID("from: @(#)setjmp.s 5.1 (Berkeley) 5/12/90")
#else
RCSID("$NetBSD: setjmp.S,v 1.12 2006/03/09 16:20:27 christos 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>
*/
ENTRY(__setjmp14)
/* Get signal stack info. Note overlay of ss_sp and ss_size! */
lea %sp@(-12),%sp /* sizeof(stack_t) */
clrl %sp@ /* ss = NULL */
movl %sp,%sp@(4) /* oss = stack_t on stack */
jbsr PIC_PLT(_C_LABEL(__sigaltstack14))
movl %sp@(8),%d0 /* ss_flags */
andl #1,%d0 /* extract SS_ONSTACK */
lea %sp@(12),%sp /* pop stack_t */
/* Get pointer to jmp_buf; a sigcontext is at the beginning. */
movl %sp@(4),%a0
movl %d0,%a0@ /* store onstack */
clrl %a0@(4) /* unused word (old style signal mask) */
/* Get the signal mask. */
pea %a0@(28) /* oset = &sc.sc_mask */
movl #0,%sp@- /* set = NULL */
movl #0,%sp@- /* action = 0 <ignored> */
jbsr PIC_PLT(_C_LABEL(__sigprocmask14))
addl #12,%sp
movl %sp@(4),%a0 /* get jmp_buf pointer again */
lea %sp@(4),%a1 /* adjust SP since we won't rts */
movl %a1,%a0@(8) /* save SP */
movl %a6,%a0@(12) /* save FP */
clrl %a0@(16) /* no AP */
movl %sp@,%a0@(20) /* save return PC */
clrl %a0@(24) /* clear PS */
/* Save remaining non-scratch regs after signal mask. */
moveml #0x3CFC,%a0@(44)
clrl %d0 /* return 0 */
rts