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Re: [rfa] ARM prologue parsing support for Thumb-2 instructions
On Tue, Oct 12, 2010 at 06:56:22PM +0200, Ulrich Weigand wrote:
> Hmm, I noticed one set of problems is due to the __libc_do_syscall
> function you added in this patch:
Wrong link :-)
> The GDB prologue parser would actually be easily capable of understanding
> this function prologue. However, it doesn't work because GDB does not even
> find the start of the function in the first place, since the symbol is
> present only in the regular symbol table (which is stripped), and not in
> the dynamic symbol table, because of the ".hidden" directive.
> Is there any particular reason why this function could not be at least
> .protected instead?
It doesn't need to be exposed; that would waste space in the dynamic
symbol table. Plus I don't understand the complete details, but
.protected is problematic.
I am not real sympathetic. Either have unwind info, or if you have a
system where that is not practical, implement .ARM.exidx based
unwinding for GDB. It can't be done in general but it can be done for
the standard table formats; there's code in readelf to dump them, for