Re: Intel assembly questions
Re: Intel assembly questions
- Subject: Re: Intel assembly questions
- From: Dave Camp <email@hidden>
- Date: Wed, 18 Jan 2006 12:09:23 -0800
On Jan 18, 2006, at 11:45 AM, Jonas Maebe wrote:
On 18 Jan 2006, at 20:31, Dave Camp wrote:
MainLoop:
movzx eax, byte Ptr [esi+4]
...
The last line is the issue. I assume the original syntax is trying
to say 'treat [esi+4] as a byte pointer". Xcode does not like the
"byte Ptr" operands.
"byte ptr" is Intel style only.
Removing those causes the following error: No such 386
instruction: movzl
What is the replacement syntax for "byte Ptr"?
In AT&T style, the operand size is always added to the instruction.
In this case, the above should become
movzbl 4(%esi),êx
Couple of more questions...
Since I've got "Codewarrior Style" enabled, I assume I'm using Intel
style operand ordering, so the operands in your example would be
backwards right?
GCC complains there is no movzbl instruction. Changing that to movzb
does not generate an error. Is that equivalent? I don't see that in
my instruction reference docs.
Thanks,
Dave
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