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Most of the 64-bit instructions default to 32-bit operands and select 64-bit using REX.W prefixes. Because of that instead of defining new instruction formats, this reuses the 32-bit formats and changes them to take the REX prefixes into account when necessary. Additionally this removes, adds or modifies the instruction descriptors in the 64-bit table, where they are different from 32-bit. Using 'disasm' these changes seem to cover pretty much all of our 64-bit binaries (except for AVX) :^) Note that UserspaceEmulator will need to account for these prefixed versions in its 32-bit instruction handlers before being usable on x86-64. |
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