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V37
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include
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exec
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libraries.i
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1991-11-27
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131 lines
IFND EXEC_LIBRARIES_I
EXEC_LIBRARIES_I SET 1
**
** $Filename: exec/libraries.i $
** $Release: 2.04 Includes, V37.4 $
** $Revision: 36.12 $
** $Date: 91/03/15 $
**
** Definitions for use when creating or using Exec libraries
**
** (C) Copyright 1985-1991 Commodore-Amiga, Inc.
** All Rights Reserved
**
IFND EXEC_NODES_I
INCLUDE "exec/nodes.i"
ENDC ; EXEC_NODES_I
*------ Special Constants ---------------------------------------
LIB_VECTSIZE EQU 6 ;Each library entry takes 6 bytes
LIB_RESERVED EQU 4 ;Exec reserves the first 4 vectors
LIB_BASE EQU -LIB_VECTSIZE
LIB_USERDEF EQU LIB_BASE-(LIB_RESERVED*LIB_VECTSIZE) ;First user func
LIB_NONSTD EQU LIB_USERDEF
*----------------------------------------------------------------
*
* Library Definition Macros (for creating libraries)
*
*----------------------------------------------------------------
*------ LIBINIT initializes the base offset for using the "LIBDEF" macro:
LIBINIT MACRO ; [baseOffset]
IFC '\1',''
COUNT_LIB SET LIB_USERDEF
ENDC
IFNC '\1',''
COUNT_LIB SET \1
ENDC
ENDM
*------ LIBDEF is used to define each library function entry:
LIBDEF MACRO ;libraryFunctionSymbol
\1 EQU COUNT_LIB
COUNT_LIB SET COUNT_LIB-LIB_VECTSIZE
ENDM
*------ FUNCDEF is used to parse library offset tables. Many applications
*------ need a special version of FUNCDEF - you provide your own macro
*------ to match your needs. Here is an example:
*
* FUNCDEF MACRO
* _LVO\1 EQU FUNC_CNT
* FUNC_CNT SET FUNC_CNT-6 * Standard offset-6 bytes each
* FUNC_CNT EQU LIB_USERDEF * Skip 4 standard vectors
* ENDM
*----------------------------------------------------------------
*
* Standard Library Functions
*
*----------------------------------------------------------------
LIBINIT LIB_BASE
LIBDEF LIB_OPEN
LIBDEF LIB_CLOSE
LIBDEF LIB_EXPUNGE ; must exist in all libraries
LIBDEF LIB_EXTFUNC ; for future expansion - must return zero.
*----------------------------------------------------------------
*
* Library Base Structure Definition
* Also used for Devices and some Resources
*
*----------------------------------------------------------------
STRUCTURE LIB,LN_SIZE
UBYTE LIB_FLAGS ; see below
UBYTE LIB_pad ; must be zero
UWORD LIB_NEGSIZE ; number of bytes before LIB
UWORD LIB_POSSIZE ; number of bytes after LIB
UWORD LIB_VERSION ; major
UWORD LIB_REVISION ; minor
APTR LIB_IDSTRING ; ASCII identification
ULONG LIB_SUM ; the system-calculated checksum
UWORD LIB_OPENCNT ; number of current opens
LABEL LIB_SIZE ;Warning: Size is not a longword multiple!
*------ LIB_FLAGS bit definitions (all others are system reserved)
BITDEF LIB,SUMMING,0 ; system is currently checksumming
BITDEF LIB,CHANGED,1 ; something has changed the library since last sum
BITDEF LIB,SUMUSED,2 ; indicates if the library allows checksumming
BITDEF LIB,DELEXP,3 ; delayed expunge flag (for use by library)
BITDEF LIB,EXP0CNT,4 ; special system expunge flag.
*---------------------------------------------------------------------------
*
* Function Invocation Macros (for calling existing, opened, libraries)
* Also see exec/macros.i
*
*---------------------------------------------------------------------------
*------ CALLLIB for calling functions where A6 is already correct:
CALLLIB MACRO ; functionOffset
IFGT NARG-1
FAIL !!! CALLLIB MACRO - too many arguments !!!
ENDC
JSR \1(A6)
ENDM
*------ LINKLIB for calling functions where A6 is incorrect:
LINKLIB MACRO ; functionOffset,libraryBase
IFGT NARG-2
FAIL !!! LINKLIB MACRO - too many arguments !!!
ENDC
MOVE.L A6,-(SP)
MOVE.L \2,A6
JSR \1(A6)
MOVE.L (SP)+,A6
ENDM
ENDC ; EXEC_LIBRARIES_I