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CU Amiga Super CD-ROM 14
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CU Amiga Magazine's Super CD-ROM 14 (1997)(EMAP Images)(GB)(Track 1 of 3)[!][issue 1997-09].iso
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CUCD
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Programming
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RKMLibsPrgs
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samplelibrary
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lib
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sample_stubs.asm
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Assembly Source File
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1992-09-03
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4KB
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118 lines
*******************************************************************************************
* sample_stubs.asm
*
* Stubs match this .fd file:
*
* ##base _SampleBase
* ##bias 30
* ##public
* Double(n1)(D0)
* AddThese(n1,n2)(D0/D1)
* ##end
*
* After assembling,
* JOIN sample_stubs.o sample_lvos.o AS sample.lib
*
* Apps LINK with LIBRARY sample.lib when calling sample.library functions
*
* If you put all of your stubs in one file, as shown here, then ALL of the stubs will be
* linked into an application that references one stub. For larger libraries, you should
* place each stub in a separate assembler file, assemble them each separately, then join
* all of the .o's together. That will allow each stub to be independently pulled into the
* application that links with the .lib.
*
*
* Copyright (c) 1992 Commodore-Amiga, Inc.
*
* This example is provided in electronic form by Commodore-Amiga, Inc. for
* use with the "Amiga ROM Kernel Reference Manual: Libraries", 3rd Edition,
* published by Addison-Wesley (ISBN 0-201-56774-1).
*
* The "Amiga ROM Kernel Reference Manual: Libraries" contains additional
* information on the correct usage of the techniques and operating system
* functions presented in these examples. The source and executable code
* of these examples may only be distributed in free electronic form, via
* bulletin board or as part of a fully non-commercial and freely
* redistributable diskette. Both the source and executable code (including
* comments) must be included, without modification, in any copy. This
* example may not be published in printed form or distributed with any
* commercial product. However, the programming techniques and support
* routines set forth in these examples may be used in the development
* of original executable software products for Commodore Amiga computers.
*
* All other rights reserved.
*
* This example is provided "as-is" and is subject to change; no
* warranties are made. All use is at your own risk. No liability or
* responsibility is assumed.
***************************************************************************
INCLUDE "exec/types.i"
INCLUDE "exec/libraries.i"
SECTION data
*----- LIBINIT initializes an LVO value to -30 to skip the first four
*----- 6-byte required library vectors (Open, Expunge, etc)
LIBINIT
*----- LIBDEF assigns the current LVO value to a label, and then
*----- bumps the LVO value by -6 in preparation for next LVO label
*----- This assigns the value -30 to our first _LVO label
LIBDEF _LVODouble ;-30
XDEF _LVODouble
*----- The value -30-6 is asigned to our second _LVO label
LIBDEF _LVOAddThese ;-36
XDEF _LVOAddThese
END
*******************************************************************************************
INCLUDE "exec/types.i"
INCLUDE "exec/libraries.i"
section code
*------ Caller declares and initializes SampleBase in their C code
XREF _SampleBase
*------ Must externally reference the _LVO labels defined in samplelib_lvos
XREF _LVODouble
XREF _LVOAddThese
*------ Make C function stubs available to caller
XDEF _Double
XDEF _AddThese
*------- These stubs move C args from stack to appropriate registers,
*------- call the library function, and return result in d0
_Double:
MOVE.L A6,-(SP) ;Save register(s)
MOVE.L 8(SP),D0 ;Copy param to register
MOVE.L _SampleBase,A6 ;Library base to A6
JSR _LVODouble(A6) ;Go to real routine
MOVE.L (SP)+,A6 ;Restore register(s)
RTS
_AddThese:
MOVE.L A6,-(SP) ;Save register(s)
MOVEM.L 8(SP),D0/D1 ;Copy params to registers
;8(SP) goes into D0
;12(SP) goes into D1
MOVE.L _SampleBase,A6 ;Library base to A6
JSR _LVOAddThese(A6) ;Go to real routine
MOVE.L (SP)+,A6 ;Restore register(s)
RTS
END