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Annotation of 43BSDReno/lib/libc/tahoe/gen/_setjmp.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 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:  * This code is derived from software contributed to Berkeley by
        !            20:  * Computer Consoles Inc.
        !            21:  */
        !            22: 
        !            23: #if defined(LIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)_setjmp.s   1.4 (Berkeley) 6/1/90"
        !            25: #endif /* LIBC_SCCS and not lint */
        !            26: 
        !            27: /*
        !            28:  * C library -- _setjmp, _longjmp
        !            29:  *
        !            30:  *     _longjmp(a,v)
        !            31:  * will generate a "return(v)" from
        !            32:  * the last call to
        !            33:  *     _setjmp(a)
        !            34:  * by restoring registers from the stack,
        !            35:  * The previous signal state is NOT restored.
        !            36:  */
        !            37: 
        !            38: #include "DEFS.h"
        !            39: 
        !            40: ENTRY(_setjmp, 0)
        !            41:        movl    4(fp),r0
        !            42:        movl    (fp),(r0)               # save frame pointer of caller
        !            43:        movl    -8(fp),4(r0)            # save pc of caller
        !            44:        clrl    r0
        !            45:        ret
        !            46: 
        !            47: ENTRY(_longjmp, 0)
        !            48:        movl    8(fp),r0                # return(v)
        !            49:        movl    4(fp),r1                # fetch buffer
        !            50:        tstl    (r1)
        !            51:        beql    botch
        !            52: loop:
        !            53:        cmpl    (r1),(fp)
        !            54:        beql    done
        !            55:        blssu   botch
        !            56:        movl    $loop,-8(fp)
        !            57:        ret                             # pop another frame
        !            58: 
        !            59: done:
        !            60:        cmpb    *-8(fp),reiins          # returning to an "rei"?
        !            61:        bneq    1f
        !            62:        movab   3f,-8(fp)               # do return w/ psl-pc pop
        !            63:        brw     2f
        !            64: 1:
        !            65:        movab   4f,-8(fp)               # do standard return
        !            66: 2:
        !            67:        ret                             # unwind stack before signals enabled
        !            68: 3:
        !            69:        addl2   $8,sp                   # compensate for PSL-PC push
        !            70: 4:
        !            71:        jmp     *4(r1)                  # done, return....
        !            72: 
        !            73: botch:
        !            74:        callf   $4,_longjmperror
        !            75:        halt
        !            76: 
        !            77:        .data
        !            78: reiins:        rei

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