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Re: [PATCH 0/5] Add support for R_386_GOT32X/R_X86_64_[REX_]GOTPCRELX
- From: Rafael EspÃndola <rafael dot espindola at gmail dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>
- Cc: Binutils <binutils at sourceware dot org>
- Date: Mon, 18 Jan 2016 12:14:30 -0500
- Subject: Re: [PATCH 0/5] Add support for R_386_GOT32X/R_X86_64_[REX_]GOTPCRELX
- Authentication-results: sourceware.org; auth=none
- References: <1445514099-20925-1-git-send-email-hjl dot tools at gmail dot com> <CAG3jReK+ViY071FL1EMKh5uqLydvDUgQjKL7EM--a1G23gof-g at mail dot gmail dot com> <CAMe9rOoTgGh3-z2KnVkZQvKeLeXgfEj-++9MpbxtVcUgPHZjKQ at mail dot gmail dot com> <CAG3jRe+LY9EMD3e8NrnpOv-HaQfRt1pYAgNMw-1cbxPKONLMow at mail dot gmail dot com> <CAMe9rOpiyAi63ZGTTNsrn2w+07rED8TZW1g12U+SW8OhqkwWLQ at mail dot gmail dot com>
> Since for some binop, linker needs to rewrite the REX byte, it needs
> to know if instruction has a REX byte. R_X86_64_GOTPCREL doesn't
> have such information
The byte stream before the R_X86_64_GOTPCREL location does. Checking
for the REX prefix is not that different from checking if the
instruction in a mov when converting mov to lea.
Cheers,
Rafael