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Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/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 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:  * This code is derived from software contributed to Berkeley by
        !            18:  * Computer Consoles Inc.
        !            19:  */
        !            20: 
        !            21: #if defined(LIBC_SCCS) && !defined(lint)
        !            22:        .asciz "@(#)setjmp.s    1.4 (Berkeley) 6/27/88"
        !            23: #endif /* LIBC_SCCS and not lint */
        !            24: 
        !            25: /*
        !            26:  * C library -- setjmp, longjmp
        !            27:  *
        !            28:  *     longjmp(a,v)
        !            29:  * will generate a "return(v)" from
        !            30:  * the last call to
        !            31:  *     setjmp(a)
        !            32:  * by restoring registers from the stack,
        !            33:  * previous signal mask, and doing a return.
        !            34:  */
        !            35: 
        !            36: #include "DEFS.h"
        !            37: 
        !            38: ENTRY(setjmp, R6)
        !            39:        movl    4(fp),r6                # construct sigcontext
        !            40:        movab   -8(sp),sp               # space for current struct sigstack
        !            41:        pushal  (sp)                    # get current values
        !            42:        pushl   $0                      # no new values
        !            43:        callf   $16,_sigstack           # pop args plus signal stack value
        !            44:        movl    (sp)+,(r6)              # save onsigstack status of caller
        !            45:        pushl   $0
        !            46:        callf   $8,_sigblock            # get signal mask
        !            47:        movl    r0,4(r6)                # save signal mask of caller
        !            48:        addl3   $8,fp,8(r6)             # save stack pointer of caller
        !            49:        movl    (fp),12(r6)             # save frame pointer of caller
        !            50:        movl    -8(fp),20(r6)           # save pc of caller
        !            51:        movpsl  24(r6)                  # save psl of caller
        !            52:        clrl    r0
        !            53:        ret
        !            54: 
        !            55: ENTRY(longjmp, 0)
        !            56:        movl    8(fp),r0                # return(v)
        !            57:        movl    4(fp),r1                # fetch buffer
        !            58:        tstl    12(r1)
        !            59:        beql    botch
        !            60: loop:
        !            61:        cmpl    12(r1),(fp)
        !            62:        beql    done
        !            63:        blssu   botch
        !            64:        movl    $loop,-8(fp)
        !            65:        ret                             # pop another frame
        !            66: 
        !            67: done:
        !            68:        cmpb    *-8(fp),reiins          # returning to an "rei"?
        !            69:        bneq    1f
        !            70:        movab   3f,-8(fp)               # do return w/ psl-pc pop
        !            71:        brw     2f
        !            72: 1:
        !            73:        movab   4f,-8(fp)               # do standard return
        !            74: 2:
        !            75:        ret                             # unwind stack before signals enabled
        !            76: 3:
        !            77:        addl2   $8,sp                   # compensate for PSL-PC push
        !            78: 4:
        !            79:        pushl   r1                      # pointer to sigcontext
        !            80:        callf   $4,_sigreturn           # restore previous context
        !            81:                                        # we should never return
        !            82: 
        !            83: botch:
        !            84:        callf   $4,_longjmperror
        !            85:        halt
        !            86: 
        !            87:        .data
        !            88: reiins:        rei

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