Patch for libdasm-1.5
March 16th, 2009While working on DynaTrex, I found a small but problematic bug in libdasm-1.5 when parsing some floating point instructions. One of the floating point opcode tables was missing 4 null entries in the middle. This resulted in some incorrect parsing for those instructions following the omission (about 32 opcode encodings). I generated a patch and sent it off to the maintainer, but in case this library isn’t maintained any longer I’m posting the patch here. For verification, try disassembling FRNDINT (0xd9 0xfc).
September 30th, 2009 at 7:07 pm
Libdasm is now being hosted and maintained on googlecode http://code.google.com/p/libdasm/ . There was a patch for some missing FPU opcodes earlier in the year. The code has also had some other fixes including other missing opcodes, and incorrect modes for opcodes that I submitted myself.
October 1st, 2009 at 12:59 am
Funnily enough, I’ve discovered the same thing just a month later myself: http://blog.oxff.net/2009/04/libasm-d9h-fpu-instructions-fix.html