3/5/2024 0 Comments Convert c to x86 assembly![]() : This message was edited by Aidman at 19:49:57 I'm not sure but I think with 32-bit exe files, there is a prefix used before every 16-bit instructions to indicate that the instruction is to be executed in 16-bit mode. ![]() Mov cx,bx 16-bit instruction, machine code = db 8Bh, CAhĪs far as I know, com programs can only run in 16-bit mode. Mov ecx,ebx 32-bit instruction, machine code = db 8Bh, CAh It just executes as a 32-bit instruction if the processor is in a 32-bit mode. The thing is, some 32-bit instructions use the exact same machine code as 16-bit instructions. : Could I have missed somthing or doing somthing wrong? But for some strange reason it changed them to 16 bit when compiled to. ![]() : I tested all of the assemblers above but only one, the FASM, accepted instructions with 32 bit registers. The format is more complicated and requires that extra data other than just machine code be included in the file. : : EXE files use other data in the header section. no other data is added to the program file, just purely your code. If you assemble com programs(pure machine code) with MicroASM( ), MyAssembler(software section on FASM( ). : : The assembler shouldn't include other data in the program unless you use includes in your source code.
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