Date: Thu, 10 May 2018 22:17:06 -0400 From: Ed Maste <emaste@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Bruce Evans <brde@optusnet.com.au>, src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r333461 - head/sys/amd64/amd64 Message-ID: <CAPyFy2BC_iC9PMaM08fHhs_iAUG=Kjw=ojQtBP1JCEyeS5XJnQ@mail.gmail.com> In-Reply-To: <20180510193816.GF6887@kib.kiev.ua> References: <201805101501.w4AF1iI0039082@repo.freebsd.org> <20180511012309.V3949@besplex.bde.org> <20180510193816.GF6887@kib.kiev.ua>
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On 10 May 2018 at 15:38, Konstantin Belousov <kostikbel@gmail.com> wrote: > > Yes, I already noted and mjg noted that ifuncs are directed through PLT. > I remember that it was not the case when I did it the first time, but then > both compiler and linker were different. I'm trying to find evidence of non-PLT ifuncs, but have been unsuccessful so far. >From ifunc.txt at https://sites.google.com/site/x32abi/documents: | All references to a STT_GNU_IFUNC symbol, including function call and | function pointer, will go through a PLT slot, which jumps to the address | stored in the GOT entry. If the STT_GNU_IFUNC symbol is locally defined, | a R_*_IRELATIVE relocation will be applied to the GOT entry at load time. | Otherwise, dynamic linker will lookup the symbol at the first call to the | function and update the GOT entry. This applies to all usages of | STT_GNU_IFUNC symbols in shared library, dynamic executable and static | executable.
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