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Annotation of 43BSD/lib/libc/vax/gen/_setjmp.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifdef LIBC_SCCS
        !             8:        .asciz  "@(#)_setjmp.s  5.5 (Berkeley) 3/9/86"
        !             9: #endif LIBC_SCCS
        !            10: 
        !            11: 
        !            12: /*
        !            13:  * C library -- _setjmp, _longjmp
        !            14:  *
        !            15:  *     _longjmp(a,v)
        !            16:  * will generate a "return(v)" from
        !            17:  * the last call to
        !            18:  *     _setjmp(a)
        !            19:  * by restoring registers from the stack,
        !            20:  * The previous signal state is NOT restored.
        !            21:  */
        !            22: 
        !            23: #include "DEFS.h"
        !            24: 
        !            25: ENTRY(_setjmp, 0)
        !            26:        movl    4(ap),r0
        !            27:        movl    12(fp),(r0)             # save frame pointer of caller
        !            28:        movl    16(fp),4(r0)            # save pc of caller
        !            29:        clrl    r0
        !            30:        ret
        !            31: 
        !            32: ENTRY(_longjmp, 0)
        !            33:        movl    8(ap),r0                # return(v)
        !            34:        movl    4(ap),r1                # fetch buffer
        !            35:        tstl    (r1)
        !            36:        beql    botch
        !            37: loop:
        !            38:        bitw    $1,6(fp)                # r0 saved?
        !            39:        beql    1f
        !            40:        movl    r0,20(fp)
        !            41:        bitw    $2,6(fp)                # was r1 saved?
        !            42:        beql    2f
        !            43:        movl    r1,24(fp)
        !            44:        brb     2f
        !            45: 1:
        !            46:        bitw    $2,6(fp)                # was r1 saved?
        !            47:        beql    2f
        !            48:        movl    r1,20(fp)
        !            49: 2:
        !            50:        cmpl    (r1),12(fp)
        !            51:        beql    done
        !            52:        blssu   botch
        !            53:        movl    $loop,16(fp)
        !            54:        ret                             # pop another frame
        !            55: 
        !            56: done:
        !            57:        cmpb    *16(fp),reiins          # returning to an "rei"?
        !            58:        bneq    1f
        !            59:        movab   3f,16(fp)               # do return w/ psl-pc pop
        !            60:        brw     2f
        !            61: 1:
        !            62:        movab   4f,16(fp)               # do standard return
        !            63: 2:
        !            64:        ret                             # unwind stack before signals enabled
        !            65: 3:
        !            66:        addl2   $8,sp                   # compensate for PSL-PC push
        !            67: 4:
        !            68:        jmp     *4(r1)                  # done, return....
        !            69: 
        !            70: botch:
        !            71:        calls   $0,_longjmperror
        !            72:        halt
        !            73: 
        !            74:        .data
        !            75: reiins: rei

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