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Re: [Mips}Using DT tags for handling local ifuncs
- From: Richard Sandiford <rdsandiford at googlemail dot com>
- To: "Maciej W. Rozycki" <macro at codesourcery dot com>
- Cc: Jack Carter <Jack dot Carter at imgtec dot com>, "binutils\ at sourceware dot org" <binutils at sourceware dot org>, Doug Gilmore <Doug dot Gilmore at imgtec dot com>
- Date: Tue, 10 Dec 2013 08:02:11 +0000
- Subject: Re: [Mips}Using DT tags for handling local ifuncs
- Authentication-results: sourceware.org; auth=none
- References: <4CEFBC1BE64A8048869F799EF2D2EEEE4C6DDC0F at BADAG02 dot ba dot imgtec dot org> <87r49p9dit dot fsf at talisman dot default> <alpine dot DEB dot 1 dot 10 dot 1312092333190 dot 19368 at tp dot orcam dot me dot uk>
"Maciej W. Rozycki" <firstname.lastname@example.org> writes:
> On Sat, 7 Dec 2013, Richard Sandiford wrote:
>> > This is not to say that it cannot be done, but is it worth the bang
>> > for the buck? How many debuggers, simulators, object dumpers am I
>> > going to mess up making a change that few will benefit from?
>> Debuggers shouldn't care. At least I don't think GDB does.
> GDB has explicit ifunc support for making manual calls to such functions,
> see stuff around elf_gnu_ifunc_fns in gdb/elfread.c; I'm not sure offhand
> whether it needs to know details discussed here though, I suggest
What we're discussing here is whether debuggers would need to understand
the ABI GOT layout, i.e. whether the debugger itself will try to figure
out where the implicitly-relocated part of the local GOT starts. I did
check that before posting originally and couldn't see anything.
(The layout only changes if ifuncs are used.)