Il 07/05/2014 14:32, Nadav Amit ha scritto:
Relative jumps and calls do the masking according to the operand size, and not according to the address size as the KVM emulator does today. In 64-bit mode, the resulting RIP is always 64-bit. Otherwise it is masked according to the instruction operand-size. Note that when 16-bit address size is used, bits 63:32 are unmodified.
The SDM says "If the operand-size attribute is 16, the upper two bytes of the EIP register are cleared, resulting in a maximum instruction pointer size of 16 bits". I'm not sure whether that should also imply that 63:32 are _not_ unmodified (because you do a 32-bit write not a 16-bit one), but in any case it looks like masked_increment is not the right function.
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