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Annotation of 43BSDReno/lib/libc/vax/gen/_setjmp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1980 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21:        .asciz "@(#)_setjmp.s   5.8 (Berkeley) 6/1/90"
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: /*
                     25:  * C library -- _setjmp, _longjmp
                     26:  *
                     27:  *     _longjmp(a,v)
                     28:  * will generate a "return(v)" from
                     29:  * the last call to
                     30:  *     _setjmp(a)
                     31:  * by restoring registers from the stack,
                     32:  * The previous signal state is NOT restored.
                     33:  */
                     34: 
                     35: #include "DEFS.h"
                     36: 
                     37: ENTRY(_setjmp, 0)
                     38:        movl    4(ap),r0
                     39:        movl    12(fp),(r0)             # save frame pointer of caller
                     40:        movl    16(fp),4(r0)            # save pc of caller
                     41:        clrl    r0
                     42:        ret
                     43: 
                     44: ENTRY(_longjmp, 0)
                     45:        movl    8(ap),r0                # return(v)
                     46:        movl    4(ap),r1                # fetch buffer
                     47:        tstl    (r1)
                     48:        beql    botch
                     49: loop:
                     50:        bitw    $1,6(fp)                # r0 saved?
                     51:        beql    1f
                     52:        movl    r0,20(fp)
                     53:        bitw    $2,6(fp)                # was r1 saved?
                     54:        beql    2f
                     55:        movl    r1,24(fp)
                     56:        brb     2f
                     57: 1:
                     58:        bitw    $2,6(fp)                # was r1 saved?
                     59:        beql    2f
                     60:        movl    r1,20(fp)
                     61: 2:
                     62:        cmpl    (r1),12(fp)
                     63:        beql    done
                     64:        blssu   botch
                     65:        movl    $loop,16(fp)
                     66:        ret                             # pop another frame
                     67: 
                     68: done:
                     69:        cmpb    *16(fp),reiins          # returning to an "rei"?
                     70:        bneq    1f
                     71:        movab   3f,16(fp)               # do return w/ psl-pc pop
                     72:        brw     2f
                     73: 1:
                     74:        movab   4f,16(fp)               # do standard return
                     75: 2:
                     76:        ret                             # unwind stack before signals enabled
                     77: 3:
                     78:        addl2   $8,sp                   # compensate for PSL-PC push
                     79: 4:
                     80:        jmp     *4(r1)                  # done, return....
                     81: 
                     82: botch:
                     83:        calls   $0,_longjmperror
                     84:        halt
                     85: 
                     86:        .data
                     87: reiins: rei

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