From: Mark Wielaard <mjw@redhat.com>
To: elfutils-devel@lists.fedorahosted.org
Subject: Re: libebl: Add ebl_func_addr_mask plus ARM backend implementation. (Was: [PATCH] libebl: Add ebl_unwind_ret_mask.)
Date: Sun, 22 Jun 2014 13:49:19 +0200 [thread overview]
Message-ID: <1403437759.9562.3.camel@bordewijk.wildebeest.org> (raw)
In-Reply-To: 1403035773.4374.35.camel@bordewijk.wildebeest.org
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On Tue, 2014-06-17 at 22:09 +0200, Mark Wielaard wrote:
> libebl: Add ebl_func_addr_mask plus ARM backend implementation.
>
> The ARM EABI says that the zero bit of function symbol st_value indicates
> whether the symbol points to a THUMB or ARM function. Also the return
> value address in an unwind will contain the same extra bit to indicate
> whether to return to a regular ARM or THUMB function. Add a new ebl
> function to mask off such bits and turn a function value into a function
> address so that we get the actual value that a function symbol or return
> address points to. It isn't easily possible to reuse the existing
> ebl_resolve_sym_value for this purpose, so we end up with another hook
> that can be used from dwfl_module_getsym, handle_cfi and elflint.
>
> Signed-off-by: Mark Wielaard <mjw@redhat.com>
Pushed after testing against Fedora armv7hl, which doesn't use THUMB by
default and Debian armhf which does use THUMB by default.
Cheers,
Mark
next reply other threads:[~2014-06-22 11:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-22 11:49 Mark Wielaard [this message]
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2014-06-17 20:09 Mark Wielaard
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