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Annotation of 43BSDTahoe/lib/libc/gen/gen.vax/_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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #if defined(LIBC_SCCS) && !defined(lint)
                     19:        .asciz "@(#)_setjmp.s   5.7 (Berkeley) 6/27/88"
                     20: #endif /* LIBC_SCCS and not lint */
                     21: 
                     22: /*
                     23:  * C library -- _setjmp, _longjmp
                     24:  *
                     25:  *     _longjmp(a,v)
                     26:  * will generate a "return(v)" from
                     27:  * the last call to
                     28:  *     _setjmp(a)
                     29:  * by restoring registers from the stack,
                     30:  * The previous signal state is NOT restored.
                     31:  */
                     32: 
                     33: #include "DEFS.h"
                     34: 
                     35: ENTRY(_setjmp, 0)
                     36:        movl    4(ap),r0
                     37:        movl    12(fp),(r0)             # save frame pointer of caller
                     38:        movl    16(fp),4(r0)            # save pc of caller
                     39:        clrl    r0
                     40:        ret
                     41: 
                     42: ENTRY(_longjmp, 0)
                     43:        movl    8(ap),r0                # return(v)
                     44:        movl    4(ap),r1                # fetch buffer
                     45:        tstl    (r1)
                     46:        beql    botch
                     47: loop:
                     48:        bitw    $1,6(fp)                # r0 saved?
                     49:        beql    1f
                     50:        movl    r0,20(fp)
                     51:        bitw    $2,6(fp)                # was r1 saved?
                     52:        beql    2f
                     53:        movl    r1,24(fp)
                     54:        brb     2f
                     55: 1:
                     56:        bitw    $2,6(fp)                # was r1 saved?
                     57:        beql    2f
                     58:        movl    r1,20(fp)
                     59: 2:
                     60:        cmpl    (r1),12(fp)
                     61:        beql    done
                     62:        blssu   botch
                     63:        movl    $loop,16(fp)
                     64:        ret                             # pop another frame
                     65: 
                     66: done:
                     67:        cmpb    *16(fp),reiins          # returning to an "rei"?
                     68:        bneq    1f
                     69:        movab   3f,16(fp)               # do return w/ psl-pc pop
                     70:        brw     2f
                     71: 1:
                     72:        movab   4f,16(fp)               # do standard return
                     73: 2:
                     74:        ret                             # unwind stack before signals enabled
                     75: 3:
                     76:        addl2   $8,sp                   # compensate for PSL-PC push
                     77: 4:
                     78:        jmp     *4(r1)                  # done, return....
                     79: 
                     80: botch:
                     81:        calls   $0,_longjmperror
                     82:        halt
                     83: 
                     84:        .data
                     85: reiins: rei

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