/*      $NetBSD: compat_setjmp.S,v 1.3 2014/03/04 06:27:00 matt 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: compat_setjmp.S,v 1.3 2014/03/04 06:27:00 matt 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(setjmp)
        lea     -12(%sp),%sp    /* space for sigstack args/rvals */
        clrl    (%sp)           /* don't change it... */
        movl    %sp,4(%sp)      /* ...but return the current val */
        jbsr    PIC_PLT(_C_LABEL(__sigaltstack14))
                                /* note: flags returned in sp@(8) */
        clrl    (%sp)           /* don't change mask, just return */
        jbsr    PIC_PLT(_C_LABEL(sigblock)) /*  old value */
        movl    8(%sp),%d1      /* old flags value */
        andl    #1,%d1          /* extract onstack flag */
        lea     12(%sp),%sp
        movl    4(%sp),%a0      /* save area pointer */
        movl    %d1,(%a0)+      /* save old onstack value */
        movl    %d0,(%a0)+      /* save old signal mask */
        lea     4(%sp),%a1      /* adjust saved SP since we won't rts */
        movl    %a1,(%a0)+      /* save old SP */
        movl    %a6,(%a0)+      /* save old FP */
        clrl    (%a0)+          /* no AP */
        movl    (%sp),(%a0)+    /* save old PC */
        clrl    (%a0)+          /* clean PS */
        moveml  #0x3CFC,(%a0)   /* save remaining non-scratch regs */
        clrl    %d0             /* return 0 */
        rts
END(setjmp)

ENTRY(longjmp)
        movl    4(%sp),%a0      /* save area pointer */
        tstl    8(%a0)          /* ensure non-zero SP */
        jeq     botch           /* oops! */
        movl    8(%sp),%d0      /* grab return value */
        jne     ok              /* non-zero ok */
        moveq   #1,%d0          /* else make non-zero */
ok:
        moveml  28(%a0),#0x3CFC /* restore non-scratch regs */
        movl    %a0,-(%sp)      /* let sigreturn */
        trap    #1              /* finish via compat_13_sigreturn13() */

botch:
        jbsr    PIC_PLT(_C_LABEL(longjmperror))
        stop    #0
END(longjmp)