Comments (1)
NyxCode
commented on August 20, 2024
With some help, I was able to figure out what's going on.
This seems to be either a documentation issue or a bug here. The documentation states
Lines 1104 to 1113 in b606dde
Either I misunderstood the docs of the
size field here, or it's incorrect.The Intel manual states
The moffs8, moffs16, moffs32, and moffs64 operands specify a simple offset relative to the segment base, where 8, 16, 32, and 64 refer to the size of the data. The address-size attribute of the instruction determines the size of the offset, either 16, 32, or 64 bits.
So on x86-64, the moffs32 offset needs to be 8 bytes, and it's name moffs32 only refers to the size of the data to be MOVed.
Besides that, using a 4byte offset seems possible, but requires an address size override prefix.
So TL;DR: The size field in DataOffset doesn't do what i thought it did.
from opcodes.
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