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Annotation of 43BSDReno/lib/libc/hp300/gen/setjmp.s, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * the Systems Programming Group of the University of Utah Computer
        !             7:  * Science Department.
        !             8:  *
        !             9:  * Redistribution and use in source and binary forms are permitted
        !            10:  * provided that: (1) source distributions retain this entire copyright
        !            11:  * notice and comment, and (2) distributions including binaries display
        !            12:  * the following acknowledgement:  ``This product includes software
        !            13:  * developed by the University of California, Berkeley and its contributors''
        !            14:  * in the documentation or other materials provided with the distribution
        !            15:  * and in all advertising materials mentioning features or use of this
        !            16:  * software. Neither the name of the University nor the names of its
        !            17:  * contributors may be used to endorse or promote products derived
        !            18:  * from this software without specific prior written permission.
        !            19:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            20:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            21:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            22:  */
        !            23: 
        !            24: #if defined(LIBC_SCCS) && !defined(lint)
        !            25:        .asciz "@(#)setjmp.s    5.1 (Berkeley) 5/12/90"
        !            26: #endif /* LIBC_SCCS and not lint */
        !            27: 
        !            28: /*
        !            29:  * C library -- setjmp, longjmp
        !            30:  *
        !            31:  *     longjmp(a,v)
        !            32:  * will generate a "return(v)" from
        !            33:  * the last call to
        !            34:  *     setjmp(a)
        !            35:  * by restoring registers from the stack,
        !            36:  * and a struct sigcontext, see <signal.h>
        !            37:  */
        !            38: 
        !            39: #include "DEFS.h"
        !            40: 
        !            41: ENTRY(setjmp)
        !            42:        subql   #8,sp           /* space for sigstack args/rvals */
        !            43:        clrl    sp@             /* don't change it... */
        !            44:        movl    sp,sp@(4)       /* ...but return the current val */
        !            45:        jsr     _sigstack       /* note: onstack returned in sp@(4) */
        !            46:        clrl    sp@             /* don't change mask, just return */
        !            47:        jsr     _sigblock       /*   old value */
        !            48:        movl    sp@(4),d1       /* old onstack value */
        !            49:        addql   #8,sp
        !            50:        movl    sp@(4),a0       /* save area pointer */
        !            51:        movl    d1,a0@+         /* save old onstack value */
        !            52:        movl    d0,a0@+         /* save old signal mask */
        !            53:        lea     sp@(4),a1       /* adjust saved SP since we won't rts */
        !            54:        movl    a1,a0@+         /* save old SP */
        !            55:        movl    a6,a0@+         /* save old FP */
        !            56:        clrl    a0@+            /* no AP */
        !            57:        movl    sp@,a0@+        /* save old PC */
        !            58:        clrl    a0@+            /* clean PS */
        !            59:        moveml  #0x3CFC,a0@     /* save remaining non-scratch regs */
        !            60:        clrl    d0              /* return 0 */
        !            61:        rts
        !            62: 
        !            63: ENTRY(longjmp)
        !            64:        movl    sp@(4),a0       /* save area pointer */
        !            65:        tstl    a0@(8)          /* ensure non-zero SP */
        !            66:        jeq     botch           /* oops! */
        !            67:        movl    sp@(8),d0       /* grab return value */
        !            68:        jne     ok              /* non-zero ok */
        !            69:        moveq   #1,d0           /* else make non-zero */
        !            70: ok:
        !            71:        moveml  a0@(28),#0x3CFC /* restore non-scratch regs */
        !            72:        movl    a0,sp@-         /* let sigreturn */
        !            73:        jsr     _sigreturn      /*   finish for us */
        !            74: 
        !            75: botch:
        !            76:        jsr     _longjmperror
        !            77:        stop    #0

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