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

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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