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Then, as it says in the section 6. So if you want to synchronize after 32 bytes of a. This means that the header is not counted towards the disassembly offset: Hence a sync point is needed. The -u switch for USE32 also invokes bit mode. Two more command line options are -r which reports the version number of NDISASM you are running, and -h which gives a short summary of command line options. I'm pretty confused right now.

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Synchronisation Suppose you are disassembling a file which contains some data which isn't machine code, and then contains some machine code. The definition of a sync point is this: As it says in the section 2. Btw look at my answer that also solved my problem. EXE files like debug will.

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This will count the skipped bytes towards the assembly offset: It's entirely possible that another spurious instruction will get generated, starting with the final byte of the data section, and then the correct first instruction in the code section will not be seen because the starting point skipped over it.

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So you may end up with a wrong disassembly even if you use auto-sync. It seemed a ndisaxm.exe to have an x86 assembler, complete with a full instruction table, and not make as much use of it as possible, so here's a disassembler which shares the instruction table and some other bits of code with NASM.

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It's perfectly feasible to specify -i and some -s options. Unicorn Meta Zoo 9: To disassemble a DOS. The -k option is provided with two comma-separated numeric arguments, the first of which is an assembly offset and the second is a number of bytes to skip. But bits 64 pop bx ret gets assembled to 0x66 0x5b 0xc3 with "nasm. Suppose you are disassembling a file which contains some data which isn't machine code, and then contains some machine code.

Then, as it says in the section 6. Johnny Pauling Johnny Pauling 4, 13 13 gold badges 50 50 silver badges 97 97 bronze badges. Again, there isn't much I can do about this. Typically, this will contain a JMP instruction, then some data, then the rest of the code. For some kinds of file, this mechanism will automatically put sync points in all the right places, and save you from having to place any sync points manually.

NDISASM can disassembleor bit code equally easily, provided of course that you remember to specify which it is to work with. It depends on the output format you use. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

However, it should be stressed that auto-sync mode is not guaranteed to catch all the sync points, and you may still have to place some manually.

NDISASM, which assumes by default that any file you give it is loaded at zero, will therefore need to be informed of this.

Terribly sorry to have posted this, but it seems that nasm defaults to 16 bit. Supposing NDISASM has just finished generating a strange machine instruction from part of the data section, and its file position is now one byte before the beginning of the code section.

Automatic Intelligent Synchronisation Suppose you are disassembling the boot sector of a DOS floppy maybe it has a virus, and you need to understand the virus so that you know what kinds of damage it might have done you.

assembly - Nasm and Disasm issue with 32/64 bit - Stack Overflow

Its argument may be expressed in any of the NASM numeric formats: So it will start disassembly exactly from the sync point, and so you will see all the instructions in your code section. The -o option allows you to declare a different origin for the file you are disassembling. Sign up or log in Sign up using Google.