[LLVMdev] Some bugs in x86 disasm (llvm-mc)

Craig Topper craig.topper at gmail.com
Wed Jan 15 23:44:11 PST 2014

I believe I have now fixed the 0x64 0xa1 0x00 0x00 0x00 0x00 bug in r199364.

On Wed, Jan 15, 2014 at 10:53 AM, Craig Topper <craig.topper at gmail.com>wrote:

> To fix it we need to change offset8/offset16/etc to have two suboperands
> and update the printer to understand that. Also update the disassembler to
> add the segment to the MCInst when its creating it. When I did these two
> things the MCCodeEmitter broke because it tried to interpret the extra
> operand as an immediate. I think I probably need to change the form from
> RawFrm to something new that I can teach the MCCodeEmitter to handle
> correctly.
> I haven't looked at the patches yet. I was out of town most of last week
> and trying to get caught back up.
> On Tue, Jan 14, 2014 at 11:11 PM, David Woodhouse <dwmw2 at infradead.org>wrote:
>> On Tue, 2014-01-14 at 22:59 -0800, Craig Topper wrote:
>> > I started trying to fix this tonight but it's pretty nasty to fix.
>> > I'll try to make another go at it later this week.
>> Much of it seems fixed already; what's left to fix? The segment prefix
>> override? Does that mean we get to fix disassembly of '0x65 0xa4' while
>> we're at it? (Although we can't even *assemble* that one, I note.)
>> Any comments on the patches I posted on Monday to fix various 16-bit
>> disasm issues?
>> --
>> dwmw2
> --
> ~Craig

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