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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    1.5 (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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