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Nintendo DS
Good ARM7/9 Binary Disassembler?
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<blockquote data-quote="FAST6191" data-source="post: 4644526" data-attributes="member: 32303"><p>You can disassemble directly with ndsdis2 - the NH9 and and NH7 switches will allow you do to a raw/blind disassemble on any given file (good if you have a memory dump or have "decrypted"/decompressed a binary, have an overlay that needs looking at or just want to direct it somewhere).</p><p></p><p>The unknown instructions are just that -- things the disassembler can not make sense of as they might not be assembly instructions (the ARM and THUMB instructions sets do not encompass everything from 00000000 to FFFFFFFF and 0000 to FFFF respectively). The binary can include anything and everything; I have actually had games store everything in overlays but even in general over the years I have pulled fonts, levels, text and more out of binaries over the years to say nothing of the general includes like the values for an array in raw hex. Do a strings search on an ARM9.bin file for a handful of games and see what you get. NDSdis2 has missed out things in the past (see some of the changelogs) but right now it is considered reasonably solid.</p><p></p><p>I would not place too much stock in the "view the registers" thing -- many times it works but it can vary wildly during operation so they are at best good suggestions. More generally (and related to the unknowns above) it is why your emulator will have an auto mode in its disassembler where standalone disassemblers (some aspects of IDA aside) will output both ARM and THUMB or need to be forced into one or the other. I would be careful when using terms like comments as well -- typically when looking at disassembled code the only comments are those the would be hacker makes. However the NEF stuff is quite nice and will allow you to do things like define a memory address by a reference/label if you wanted which is why I was curious there.</p></blockquote><p></p>
[QUOTE="FAST6191, post: 4644526, member: 32303"] You can disassemble directly with ndsdis2 - the NH9 and and NH7 switches will allow you do to a raw/blind disassemble on any given file (good if you have a memory dump or have "decrypted"/decompressed a binary, have an overlay that needs looking at or just want to direct it somewhere). The unknown instructions are just that -- things the disassembler can not make sense of as they might not be assembly instructions (the ARM and THUMB instructions sets do not encompass everything from 00000000 to FFFFFFFF and 0000 to FFFF respectively). The binary can include anything and everything; I have actually had games store everything in overlays but even in general over the years I have pulled fonts, levels, text and more out of binaries over the years to say nothing of the general includes like the values for an array in raw hex. Do a strings search on an ARM9.bin file for a handful of games and see what you get. NDSdis2 has missed out things in the past (see some of the changelogs) but right now it is considered reasonably solid. I would not place too much stock in the "view the registers" thing -- many times it works but it can vary wildly during operation so they are at best good suggestions. More generally (and related to the unknowns above) it is why your emulator will have an auto mode in its disassembler where standalone disassemblers (some aspects of IDA aside) will output both ARM and THUMB or need to be forced into one or the other. I would be careful when using terms like comments as well -- typically when looking at disassembled code the only comments are those the would be hacker makes. However the NEF stuff is quite nice and will allow you to do things like define a memory address by a reference/label if you wanted which is why I was curious there. [/QUOTE]
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