[v6 PATCH 06/21] x86/insn-eval: Add utility functions to get segment selector
bp at suse.de
Sun Apr 30 12:15:27 CDT 2017
On Wed, Apr 26, 2017 at 01:44:43PM -0700, Ricardo Neri wrote:
> I regard that the role of this function is to obtain the the segment
> selector from either of the prefixes or inferred from the operands. It
> is the role of caller to determine if the segment selector should be
No, this is wrong. The function is called resolve_seg_selector() and it
gives you the segment selector. CS, DS, ES, and SS in 64-bit mode are
treated as null segments and your function should return/signal exactly
that, i.e, saying that those should be ignored in that case.
> I double-checked the latest version of the Intel Software Development
> manual , in the table 3-5 in section 3.7.4 mentions that DS is
> default segment for all data references, except string destinations. I
> tested this code with the UMIP-protected instructions and whenever I use
> %edi the default segment is %ds.
Yes, all correct. Except that we're adding a more-or-less generic x86
insn decoder so we should make it so...
> Is this example valid? The documentation of MOVS specifies that it
> always moves DS:(E)SI to ES:(E)DI.
... that the decoder should do exactly that:
if (MOVS and rDI)
And you're handing in struct insn * so you can easily check which insn
you're looking at.
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