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Re: port-vax/43273: ld.elf_so frame handling breaks exception unwinding for C++
The following reply was made to PR port-vax/43273; it has been noted by GNATS.
From: "Valeriy E. Ushakov" <uwe%stderr.spb.ru@localhost>
Subject: Re: port-vax/43273: ld.elf_so frame handling breaks exception
unwinding for C++
Date: Tue, 23 Nov 2010 06:44:26 +0300
After some investigation it turns out that exceptions on VAX are
completely broken, or rather not even implemented.
I have some initial gcc patches that make unwinding work, but VAX also
needs eh_return instruction pattern to properly adjust stack on
return. My knowledge of how to write gcc's machine descriptions is
With exceptions fixed in general case, we can either provide manually
written .eh_frame DWARF2 bits for _rtld_bind_start so that unwinder
can walk through it, or implement fallback unwinder that would use
call frame instead of DWARF2 descriptions.
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