[PATCH, AArch64] Associate 'stack_ptr' with wsp register in ILP32

[Yufeng Zhang]

Hi,

This patch changes the global register variable 'stack_ptr' in the 
AArch64 port to be declared with asm ("wsp") in ILP32.

OK for the trunk?

Thanks,
Yufeng


libgloss/

         * aarch64/syscalls.c (stack_ptr): Defined with asm ("wsp")
         if __ILP32__ is defined.
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