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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    1.5 (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:  * previous signal mask, and doing a return.
        !            36:  */
        !            37: 
        !            38: #include "DEFS.h"
        !            39: 
        !            40: ENTRY(setjmp, R6)
        !            41:        movl    4(fp),r6                # construct sigcontext
        !            42:        movab   -8(sp),sp               # space for current struct sigstack
        !            43:        pushal  (sp)                    # get current values
        !            44:        pushl   $0                      # no new values
        !            45:        callf   $16,_sigstack           # pop args plus signal stack value
        !            46:        movl    (sp)+,(r6)              # save onsigstack status of caller
        !            47:        pushl   $0
        !            48:        callf   $8,_sigblock            # get signal mask
        !            49:        movl    r0,4(r6)                # save signal mask of caller
        !            50:        addl3   $8,fp,8(r6)             # save stack pointer of caller
        !            51:        movl    (fp),12(r6)             # save frame pointer of caller
        !            52:        movl    -8(fp),20(r6)           # save pc of caller
        !            53:        movpsl  24(r6)                  # save psl of caller
        !            54:        clrl    r0
        !            55:        ret
        !            56: 
        !            57: ENTRY(longjmp, 0)
        !            58:        movl    8(fp),r0                # return(v)
        !            59:        movl    4(fp),r1                # fetch buffer
        !            60:        tstl    12(r1)
        !            61:        beql    botch
        !            62: loop:
        !            63:        cmpl    12(r1),(fp)
        !            64:        beql    done
        !            65:        blssu   botch
        !            66:        movl    $loop,-8(fp)
        !            67:        ret                             # pop another frame
        !            68: 
        !            69: done:
        !            70:        cmpb    *-8(fp),reiins          # returning to an "rei"?
        !            71:        bneq    1f
        !            72:        movab   3f,-8(fp)               # do return w/ psl-pc pop
        !            73:        brw     2f
        !            74: 1:
        !            75:        movab   4f,-8(fp)               # do standard return
        !            76: 2:
        !            77:        ret                             # unwind stack before signals enabled
        !            78: 3:
        !            79:        addl2   $8,sp                   # compensate for PSL-PC push
        !            80: 4:
        !            81:        pushl   r1                      # pointer to sigcontext
        !            82:        callf   $4,_sigreturn           # restore previous context
        !            83:                                        # we should never return
        !            84: 
        !            85: botch:
        !            86:        callf   $4,_longjmperror
        !            87:        halt
        !            88: 
        !            89:        .data
        !            90: reiins:        rei

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