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    Types: TextFile
    Names: »XLBMT_STRING_FUNCTION_68K_UNIX_S«

└─⟦85b835f43⟧ Bits:30000549 8mm tape, Rational 1000, Xlib rev 6.00
    └─ ⟦0c20f784e⟧ »DATA« 
        └─⟦1abbe589f⟧ 
            └─⟦059497ac5⟧ 
                └─⟦this⟧ 

TextFile

|---For use with TeleGen2 on 68K Unix
|
|------------------------------------------------------------------------------
|-- Copyright 1990 - 1991 by Rational, Santa Clara, California.
|--
|--                  All Rights Reserved.
|--
|-- Permission to use, copy, modify, and distribute this software and its
|-- documentation for any purpose and without fee is hereby granted,
|-- provided that the above copyright notice(s) appear in all copies and that
|-- both that copyright notice(s) and this permission notice appear in
|-- supporting documentation, and that the name of Rational not be used in
|-- advertising or publicity pertaining to distribution of the software
|-- without specific, written prior permission.
|--
|-- Rational disclaims all warranties with regard to this software, including
|-- all implied warranties of merchantability and fitness, in no event shall
|-- Rational be liable for any special, indirect or consequential damages or
|-- any damages whatsoever resulting from loss of use, data or profits, whether
|-- in an action of contract, negligence or other tortious action, arising out
|-- of or in connection with the use or performance of this software.
|------------------------------------------------------------------------------
|
| Used to invoke a procedure variable (procedure or function) that has any
| kind of IN, OUT, or IN OUT parameters.  This is the most general form and
| it will work properly with any procedure or function.

        .data
        .text
        .proc

|---Usage:
|       Xlbmt_Invoke_String_Function ( Function'Address,
|                                      Function_A4,
|                                      First_Argument'Address )

        .globl  _Xlbmt_Invoke_String_Function
_Xlbmt_Invoke_String_Function:

|---Standard Ada prologue

        link    a6,#-12
        movl    sp,a6@(-4)
        movl    a4,a6@(-12)             | Save caller's a4

|---Sometimes the argument list is not on a 32 bit boundary.  Adjust our
|   argument address to be on a 32 bit boundary.

        addl    #2,a6@(28)               | Add 2 to the address
        andl    #-4,a6@(28)              | Modulo-4; 32 bit boundary

|---Get address of the first argument in a0, then get address of 1st location
|   past the last argument in a1.

        movl    a6@(28),a0               | Get address of 1st argument
        movl    a6@,a1                   | Get caller's A6 register
        addl    #28,a1                   | Get addr of last word in Nth arg

|---Sometimes the end of the list is not on a 32 bit boundary.  Adjust our
|   starting address to have the same offset; we know we are pasing words.

        movl    a1,d0                   | Get our ending address
        andl    #3,d0                   | Keep the bottom 2 bits
        addl    d0,a0                   | Add that offset to the starting addr

|---Push our arguments onto the stack again so that we can call the subprogram
|   and he can access them.  Loop until a0==a1.

        cmpl    a0,a1                   | Any arguments to copy?
        jge     L137                    | Jump if not
L136:
        movl    a0@-,sp@-               | Loop copying arguments
        cmpl    a0,a1
        jlt     L136
L137:
        lea     sp@(-12), sp            | Strings require 5 more words
        movl    a6@(12), sp@-           |  two of them were arguments to us.
        movl    a6@(8), sp@-

|---Set A4 for our subroutine and then call him.

        movl    a6@(32),a4
        movl    a6@(36),a0
        jsr     a0@

|---Now we must "return" the string value that was returned to us.

        movl    sp@(16), a6@(24)        | Those 5 extra words need to be
        movl    sp@(12), a6@(20)        |  copied back to our own arguments.
        movl    sp@(8), a6@(16)
        movl    sp@(4), a6@(12)

|---Standard Ada epilogue

L139:
    movl    a6@(-12),a4
        unlk    a6
        rts

        .data