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Date: Tue, 12 May 2015 15:37:00 -0000
From: Michael Matz <matz@suse.de>
To: Jan Beulich <JBeulich@suse.com>
cc: "H.J. Lu" <hjl.tools@gmail.com>, Binutils <binutils@sourceware.org>
Subject: Re: [committed, PATCH] Remove Disp16|Disp32 from 64-bit direct branches
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References: <20150511212331.GA1838@intel.com> <5551F4E70200007800079575@mail.emea.novell.com> <CAMe9rOpDbkeFbmNbQh0a1AKhAQy-cH4HJu20o_ERQaoR6sTxbQ@mail.gmail.com> <55520C440200007800079718@mail.emea.novell.com> <CAMe9rOpFgSyJm-oceuDkrBYnBQGv01ywCc43WySqX21NTJYi4Q@mail.gmail.com> <555216370200007800079773@mail.emea.novell.com> <CAMe9rOpOx=SSUZnCFimn4fBzFqNRDch8QYLn3Os_y7EfQH65Qw@mail.gmail.com> <5552318402000078000798A8@mail.emea.novell.com> <CAMe9rOoqcr7aE8dr6E44KUK6JLrNMNcDNFFWhcb6K+14M=Y+=w@mail.gmail.com> <555233B602000078000798EF@mail.emea.novell.com> <CAMe9rOrOS+K0R+r1jHCNwAkgrhjftHUOGt_wTuP8wRYcPdifmQ@mail.gmail.com> <555235930200007800079911@mail.emea.novell.com>
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Hi,

On Tue, 12 May 2015, Jan Beulich wrote:

> I don't think so - this looks quite okay. It would become more of an 
> issue when looking at other than relocatable object files (namely when 
> their image base is non-zero), or ones with .text exceeding 32k.

Actually also that one is correctly printed I think (from a hello world 
main, where I added a jmprel16 +0):

000000000040055c <main>:
  40055c:       55                      push   %rbp
  40055d:       48 89 e5                mov    %rsp,%rbp
  400560:       48 83 ec 30             sub    $0x30,%rsp
  400564:       c6 45 d1 00             movb   $0x0,-0x2f(%rbp)
  400568:       c6 45 d0 61             movb   $0x61,-0x30(%rbp)
  40056c:       48 8d 45 d0             lea    -0x30(%rbp),%rax
  400570:       48 89 c2                mov    %rax,%rdx
  400573:       be 44 06 40 00          mov    $0x400644,%esi
  400578:       66 e9 00 00             jmpw   57c <_init-0x3ffe8c>

000000000040057c <next>:
  40057c:       bf 52 06 40 00          mov    $0x400652,%edi
  ...

It shows that rip is going to be truncated.


Ciao,
Michael.