[LLVMdev] How to force stack alignment for particular target triple in JIT?

[Yuri]

On 02/20/2011 23:50, Duncan Sands wrote:
> Hi Yuri,
>
>    
>> I get SEGV in gcc-compiled procedure in Solaris10-i386. This procedure
>> is called from llvm JIT code.
>> Exact instruction that crashes is this: movdqa %xmm0, 0x10(%esp)
>> %esp is 8-aligned, and by definition of movdqa it expects 16-aligned stack.
>> This leads me to believe that llvm uses wrong ABI when calling external
>> procedures and doesn't align stack properly.
>>
>> llvm module executing in JIT has this target triple: i386-pc-solaris2.10
>>
>> Isn't target triple supposed to set correct ABI including stack
>> alignment? How to set the correct alignment for this triple?
>>      
> it is, however as far as I can see nowhere in LLVM makes any important
> decisions based on the triple containing "solaris".  I suggest you try
> to work out how the stack alignment is set for other operating systems
> and send in a patch fixing the solaris case.
>
> Ciao, Duncan

The attached patch fixes the problem for me. Though further changes will 
likely be needed for full Solaris ABI compatibility.

Yuri
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