mirror of
https://github.com/elliotnunn/supermario.git
synced 2024-11-29 20:49:19 +00:00
65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
;
|
|
; File: EndianAware.a
|
|
;
|
|
; Contains: macros for 68K clients that are aware of platform endian-ness
|
|
;
|
|
; Written by: Craig Prouse
|
|
;
|
|
; Copyright: © 1993 by Apple Computer, Inc., all rights reserved.
|
|
;
|
|
; Change History (most recent first):
|
|
;
|
|
; <1> 11/10/93 fau first checked in
|
|
;
|
|
;
|
|
|
|
IF (&TYPE('__INCLUDINGENDIANAWARE__') = 'UNDEFINED') THEN
|
|
__INCLUDINGENDIANAWARE__ SET 1
|
|
|
|
IF &TYPE('littleEndian') = 'UNDEFINED' THEN
|
|
littleEndian SET 1
|
|
ENDIF
|
|
|
|
|
|
; ……………………………………………………………………………………………………………………………………………………………………………………………………………………
|
|
; ENDSW (pseudo-instruction)
|
|
;
|
|
; Operation: (Size = Byte) None
|
|
; (Size = Word) Dn[8:15] <-> Dn[7:0]
|
|
; (Size = Long) Dn[31:24] <-> Dn[7:0]; Dn[23:16] <-> Dn[15:8]
|
|
;
|
|
; Syntax: ENDSW Dn
|
|
;
|
|
; Attributes: Size = (Byte, Word, Long)
|
|
;
|
|
; Description: Exchange bytes within a word or longword to convert between
|
|
; big-endian and little-endian representations.
|
|
;
|
|
; CCR: Undefined
|
|
; ……………………………………………………………………………………………………………………………………………………………………………………………………………………
|
|
|
|
MACRO
|
|
ENDSW.&size &Dn
|
|
|
|
IF &UC(&size) = 'L' OR &UC(&size) = 'W' OR &UC(&size) = 'B' OR &size = '' THEN
|
|
|
|
IF littleEndian THEN
|
|
IF &UC(&size) <> 'B' THEN
|
|
rol.w #8,&Dn
|
|
ENDIF ; Size <> Byte
|
|
IF &UC(&size) = 'L' THEN
|
|
swap &Dn
|
|
rol.w #8,&Dn
|
|
ENDIF ; Size = Long
|
|
ENDIF ; littleEndian
|
|
|
|
ELSE
|
|
AERROR (&CONCAT('''',&UC(&size),''' is an invalid operand size for ENDSW'))
|
|
|
|
ENDIF ; Size = B | W | L
|
|
|
|
ENDM
|
|
|
|
|
|
ENDIF ; __INCLUDINGENDIANAWARE__
|