jjoshua@remus.rutgers.edu (J. Joshua) (08/11/90)
Could someone please give me the layout of a CODE 0 resource? Do the first few bytes mean anything or is the whole thing just one big jump table? JOn. -- ________ | | This Messsage A Service By: | | Closed Captioned Jon Joshua | | For the Hearing Impaired jjoshua@remus.rutgers.edu `----. .-' |/ #include <whittyComment.h>
stevec@Apple.COM (Steve Christensen) (08/13/90)
In article <Aug.11.01.18.24.1990.26676@remus.rutgers.edu> J. Joshua writes: >Could someone please give me the layout of a CODE 0 resource? Do the >first few bytes mean anything or is the whole thing just one big jump >table? According to the Segment Loader chapter of Inside Mac, volume II: 4 bytes "above A5" size in bytes from where A5 points to the top of the application space 4 bytes "below A5" size in bytes of application globals plus QuickDraw globals 4 bytes length of jump table 4 bytes offset to jump table relative to A5 n bytes jump table (list of 8 byte entries) An entry in the jump table will be in one of two states depending on if its segment is loaded or not: "unloaded" 2 bytes routine's offset relative to the start of the segment 4 bytes MOVE.W #segmentNumber,-(SP) instruction 2 bytes _LoadSeg trap ($A9F0) "loaded" 2 bytes segment number 6 bytes JMP routine'sAbsoluteAddress instruction steve -- ____________________________________________________________________ Steve Christensen Internet: stevec@goofy.apple.com Apple Computer, Inc. AppleLink: STEVEC 20525 Mariani Ave, MS 81-CS CompuServe: 76174,1712 Cupertino, CA 95014 "You just contradicted me." "No I didn't." ____________________________________________________________________