/* $OpenBSD: sigsetjmp.S,v 1.17 2016/09/22 18:23:58 guenther Exp $ */
/*-
 * Copyright (c) 2002 Steve Murphree, Jr.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Steve Murphree, Jr.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "SYS.h"

/*
 * C library -- sigsetjmp, siglongjmp
 *
 *      siglongjmp(a,v)
 * will generate a "return(v)" from the last call to
 *      sigsetjmp(a,savemask)
 * by restoring registers from the stack, as well as the signal mask if the
 * `savemask' parameter was non-zero.
 *
 * For m88k, we define our sigjmp_buf length to be the size of 22 (_JBLEN + 1)
 * longs.  The buffer layout is as follows:
 *
 * sigjmp_buf[0]                return address
 * sigjmp_buf[1]                signal set (if used)
 * sigjmp_buf[2 to 19]          r14 to r31
 * sigjmp_buf[20]               setjmp type
 * sigjmp_buf[21]               value of `savemask' parameter
 */

#define SIGSETJMP_SIG   0x582e

/*
int sigsetjmp(sigjmp_buf env, int savemask);
 */
ENTRY(sigsetjmp)
        st      %r1, %r2,0      /* save registers to the environment buffer */
        st      %r14,%r2,8
        st      %r15,%r2,12
        st      %r16,%r2,16
        st      %r17,%r2,20
        st      %r18,%r2,24
        st      %r19,%r2,28
        st      %r20,%r2,32
        st      %r21,%r2,36
        st      %r22,%r2,40
        st      %r23,%r2,44
        st      %r24,%r2,48
        st      %r25,%r2,52
        st      %r26,%r2,56
        st      %r27,%r2,60
        st      %r28,%r2,64
        st      %r29,%r2,68
        st      %r30,%r2,72
        st      %r31,%r2,76
        or      %r4,%r0,SIGSETJMP_SIG   /* r4 now contains setjmp type */
        st      %r4,%r2,80      /* setjmp type to _setjmp */
        bcnd.n  eq0,%r3,1f      /* skip signal stuff if savemask == 0 */
         st     %r3,%r2,84      /* save `savemask' value */

        or      %r4,%r2,0       /* save r2 in r4 */
        or      %r3,%r0,0       /* set = empty */
        or      %r2,%r0,1       /* how = SIG_BLOCK */
        __DO_SYSCALL(sigprocmask)
        or      %r0,%r0,%r0     /* NOP to fill error case of syscall */
        st      %r2,%r4,4       /* save signal set in offset 4 of env */
        ld      %r1,%r4,0
1:
        jmp.n   %r1             /* return 0 */
         or     %r2,%r0,0
END(sigsetjmp)

/*
void siglongjmp(sigjmp_buf env, int val);
 */
ENTRY(siglongjmp)
        bcnd    eq0,%r2,2f      /* check for bad environment buffer address. */
        ld      %r4,%r2,80      /* check setjmp type. */
        cmp     %r4,%r4,SIGSETJMP_SIG   /* should be SIGSETJMP_SIG */
        bb1     ne,%r4,2f       /* if != SIGSETJMP_SIG, abort. */
        
        ld      %r14,%r2,8      /* restore registers from the environment buffer */
        ld      %r15,%r2,12
        ld      %r16,%r2,16
        ld      %r17,%r2,20
        ld      %r18,%r2,24
        ld      %r19,%r2,28
        ld      %r20,%r2,32
        ld      %r21,%r2,36
        ld      %r22,%r2,40
        ld      %r23,%r2,44
        ld      %r24,%r2,48
        ld      %r25,%r2,52
        ld      %r26,%r2,56
        ld      %r27,%r2,60
        ld      %r28,%r2,64
        ld      %r29,%r2,68
        ld      %r30,%r2,72
        ld      %r4,%r2,84      /* get `savemask' value */
        bcnd.n  eq0,%r4,1f
         ld     %r31,%r2,76

        or      %r4,%r2,0       /* save r2 in r4 */
        or      %r5,%r3,0       /* and r3 in r5 */
        ld      %r3,%r2,4       /* load the saved mask into r3 */
        or      %r2,%r0,3       /* how = SIG_SETMASK */
        __DO_SYSCALL(sigprocmask)
        or      %r0,%r0,%r0     /* NOP to fill error case of syscall */
        or      %r2,%r4,0       /* restore r2 */
        or      %r3,%r5,0       /* restore r3 */

1:
        bcnd.n  ne0,%r3,1f
         ld     %r1,%r2,0               /* restore r1 */
        or      %r3,%r0,1               /* never return zero! */
1:
        jmp.n   %r1
         or     %r2,%r3,%r0

2:      br      _HIDDEN(abort)  /* NO RETURN */
END(siglongjmp)