Assembly question
BlitzMax Forums/BlitzMax Programming/Assembly question
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| Hi there. I have a small problem -( I need to know if its possible to insert ASM Code directly into the code by opcodes. Example: There is a routine and I want to execute the following asm opcodes: &hEB,&h03,&hD6,&hD6,&h00 some other blitzmax code.. and then I need to execute &hEB,&h03,&hD6,&hD6,&hFF Any ideas? If there is a way to directly insert asm-code in any way it would be nice if someone could point me to the right direction. Opcodes or asm-instructions. It is important that the asm-code is executed exactly in the position where its inserted, not called as function. |
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| Could you have your asm in functions in a seperate file and call them at the required points? |
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You're mad, but here goes:Function Call( p:Byte Ptr ) Local f()=p f End Function Local p:Byte[]=[Byte($eb),Byte($03),Byte($d6),Byte($00)] Call p Of course, I have not and will not run this - and if it crashes, please, no bug reports! A tidier way would be to Import the asm source, and declare an extern function, eg: Import "myasm.s" Extern Function myfunc() 'declare as '_myfunc' in asm... End Extern myfunc |
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| Wow, cool -) My problem is I can not run the code as a function. Background: I am using a software that encrypts the .exe file and it uses the Opcodes as an identifier for start/stop the encryption. The tool encrypts and protects the exe file to make shareware-stuff. Any more ideas? btw: Blitz3D and BlitzMax are the coolest thing on earth -) |
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| is it possible to insert the opcodes with a hex editor perhaps?! |
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| No because you need to insert them on specific positions. |
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| If you use incbin to include the opcode data, would it get included at that exact location, or would it have some kind of header thing int he way? |
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| There is no separation between data and code section so I expect that this won't work but I'll give it a try. |
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| I'm thinking it might not work. If the program flow had to go `past` an incbin statement, either the incbin would end up at the end of the actual file or there would be an extra jump instruction which would completely skip the data. It couldn't be treated as a program. Could you use Data statements to define the opcodes you want stored? Maybe same problems tho? |
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| If you are just trying to encrypt `most of` the program or whatever, would it matter that there is some kind of a `jump` instruction just prior to the opcodes? Or do you need the opcodes to actually be executed? |
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| I tried a lot of ways now, even the direct ASM way without success. I tried to include ASM-Code like this ; test.s format MS COFF section "code" code db $eb,$03,$d6,$d6,$ff but the include statement is only possible at the beginning of the file. I tried to write C Code and implement it via Inline-ASM and GCC was funny enough to tell my that my DB command is not understood.. #define SECUREBEGIN asm ("db 0xEB,0x03,0xD6,0xD6,0x00;") Well what I need is a command to insert an opcode -((( Playing and mixing around is very interesting, specially the thing that its possible to mix c and blitzmax, but its a little bit oversized for my problem. Something like: Opcode $eb,$03,$d6,D6,$0 thats what I need -(((( |
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