[Bug libc/12123] SIGBUS on strstr_sse42 due to bad alignment

["viriketo at gmail dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12123

--- Comment #5 from Lluís <viriketo at gmail dot com> 2010-10-26 07:50:57 UTC ---
Sorry, but I don't think the problem is in the strstr file.

As the traces show, the code in strstr is properly compiled and looks good.
Simply gcc assumed at the start of the function the code will be stack-aligned.

Before main() in C programs, the libc assures that the stack is aligned. And
gcc assures that no function misaligns the stack.

But the problem I mention happens in a strstr() call *BEFORE* main(), in the
dynamic loader, where the stack may not be aligned. And then, any SIMD code
compiled by gcc will fail, because the assumption of aligned stack looks like
not being true at that moment.

I think this problem is more of the dynamic loader, which should assure an
aligned stack before calling anything like strstr().

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