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Annotation of 43BSDTahoe/lib/libc/gen/gen.vax/setjmp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 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 this notice is preserved and that due credit is given
                      7:  * to the University of California at Berkeley. The name of the University
                      8:  * may not be used to endorse or promote products derived from this
                      9:  * software without specific written prior permission. This software
                     10:  * is provided ``as is'' without express or implied warranty.
                     11:  */
                     12: 
                     13: #if defined(SYSLIBC_SCCS) && !defined(lint)
                     14: _sccsid:.asciz "@(#)setjmp.s   5.7 (Berkeley) 5/25/88"
                     15: #endif /* SYSLIBC_SCCS and not lint */
                     16: 
                     17: /*
                     18:  * C library -- setjmp, longjmp
                     19:  *
                     20:  *     longjmp(a,v)
                     21:  * will generate a "return(v)" from
                     22:  * the last call to
                     23:  *     setjmp(a)
                     24:  * by restoring registers from the stack,
                     25:  * and a struct sigcontext, see <signal.h>
                     26:  */
                     27: 
                     28: #include "DEFS.h"
                     29: 
                     30: ENTRY(setjmp, R6)
                     31:        movl    4(ap),r6                # construct sigcontext
                     32:        subl2   $8,sp                   # space for current struct sigstack
                     33:        pushl   sp                      # get current values
                     34:        pushl   $0                      # no new values
                     35:        calls   $3,_sigstack            # pop args plus signal stack value
                     36:        movl    (sp)+,(r6)+             # save onsigstack status of caller
                     37:        pushl   $0
                     38:        calls   $1,_sigblock            # get signal mask
                     39:        movl    r0,(r6)+                # save signal mask of caller
                     40:        movl    (ap),r0
                     41:        moval   4(ap)[r0],(r6)+         # save sp of caller
                     42:        movl    12(fp),(r6)+            # save frame pointer of caller
                     43:        movl    8(fp),(r6)+             # save argument pointer of caller
                     44:        movl    16(fp),(r6)+            # save pc of caller
                     45:        movpsl  (r6)                    # save psl of caller
                     46:        movw    4(fp),(r6)
                     47:        clrl    r0
                     48:        ret
                     49: 
                     50: ENTRY(longjmp, 0)
                     51:        movl    8(ap),r0                # return(v)
                     52:        movl    4(ap),r1                # fetch buffer
                     53:        tstl    12(r1)
                     54:        beql    botch
                     55: loop:
                     56:        cmpl    12(r1),fp               # are we there yet?
                     57:        beql    done
                     58:        blssu   botch
                     59:        moval   20(fp),r2
                     60:        blbc    6(fp),1f                # was r0 saved?
                     61:        movl    r0,(r2)+
                     62: 1:
                     63:        bbc     $1,6(fp),2f             # was r1 saved?
                     64:        movl    r1,(r2)
                     65: 2:
                     66:        movl    $loop,16(fp)
                     67:        ret                             # pop another frame
                     68: 
                     69: done:
                     70:        pushl   r1                      # pointer to sigcontext
                     71:        calls   $1,_sigreturn           # restore previous context
                     72:                                        # we should never return
                     73: botch:
                     74:        calls   $0,_longjmperror
                     75:        halt

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