This gets to the other sense of your query: "I want to make a disassembler". The source for ndisasm is available, and it handles many of the descendants of 8086, not just 8086, itself (which seriously clutters it, if all you want is an 8086 or even 80386 disassembler), but it is not self-contained and has a heavy dependency on the rest of the distribution.
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And then you've just disassembled a disassembler that also happens to do CPU emulation, like Fake86 does - but only for the 8086. You'll have to make the absolute addresses relative (using the original relocation table as a guide), to make is re-assemblable. Once you do that, you can work on the source. The opcode table is in clear view (if you display it as text) - both when seen in the packed and unpacked versions of debug.exe.
I might port the DAS disassembler to the x86, since items (a)-(f) are already incorporated into DAS's design. I've only ever ported it to the 8051, 6800, 6809 and 8080/8085 (and Z80) up to now; but the transition from 8085 to 8086 is relatively small. To that end, I might hack something out of Fake86. That's mostly abandonware, now, since the author replaced it by XTulator, as Fake86 was written when the programmer was relatively new to C. You might also be able to hack something directly out of DosDebug's opcode tables (their "instr.*" files).
and parameters are passed to these calls on the stack.The comments instruct us to assemble into an object formatof "win32" (not "coff"!) then link with the linker ld.Of course you can use any linker you want, but ld comeswith gcc and you can download a whole Win32 portof gcc for free. We pass thestarting address to the linker, and specify the static librarylibkernel32.a to link with. This static libraryis part of the Win32 gcc distribution, and itcontains the right calls into the system DLLs.
There are several editions of IDA Pro: freeware edition, standard edition and advanced edition. The latest freeware edition is IDA Pro version 4.3 (AFAIK) and it's available for download at _pro_freeware_version.htm. Newer IDA Pro freeware version is available for download here.It's the most limited of all IDA Pro version. It only supports x86 processor and doesn't come with plugin feature, but it comes at no cost, that's why it's presented here. Fortunately, it still comes with scripting feature. The standard and advanced editions of IDA Pro 4.3 of course differ from this freeware edition, they come with support for plugin and support for much more processor architecture. We are going to learn how to use the scripting feature in the next section. 2ff7e9595c
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