On Aug 28, 2014, at 12:15 AM, Sergey Isakov <isakov...@bk.ru> wrote:
>>
>>
>> Actually I just noticed you are getting an illegal text-relocation error.
>> This is usually caused by an absolute relocation, and clang wants it to be
>> IP relative. Basically Xcode/clang only supports a subset of the relocations
>> that gcc uses for X64.
> If I correctly understand you, compilation for Thunk16 is not possible in
> XCLANG toolset because of idea of this codes?
>
No, but this toolchain puts extra restrictions on how things can be coded.
For example Thunk16.asm contains absolute addressing
lea r8, @RetFromRealMode
But in Thunk16.S this is converted to IP relative addressing to support clang.
lea L_RetFromRealMode(%rip), %r8
Some of the .set address math in Thunk16.S is also working around addressing
mode limitations, as it removes relocations from the code.
Thanks,
Andrew Fish
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