From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-406602-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 2431 invoked by alias); 14 Nov 2012 16:14:08 -0000
Received: (qmail 2283 invoked by uid 48); 14 Nov 2012 16:13:49 -0000
From: "glider at google dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/55289] darwin bootstrap fails due to missing libsanitizer/interception/mach_override directory and files
Date: Wed, 14 Nov 2012 16:14:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: bootstrap
X-Bugzilla-Keywords:
X-Bugzilla-Severity: critical
X-Bugzilla-Who: glider at google dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: CC
Message-ID: <bug-55289-4-jwPeyv0YQs@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55289-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55289-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2012-11/txt/msg01264.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55289

Alexander Potapenko <glider at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |glider at google dot com

--- Comment #28 from Alexander Potapenko <glider at google dot com> 2012-11-14 16:13:47 UTC ---
===========================================================
t.o:     file format mach-o-x86-64


Disassembly of section .text:

0000000000000000 <_foo>:
   0:    55                       push   %rbp
   1:    48 89 e5                 mov    %rsp,%rbp
   4:    90                       nop
   5:    90                       nop
   6:    90                       nop
   7:    90                       nop
   8:    48 8d 05 11 4f 0b 00     lea    0xb4f11(%rip),%rax        # b4f20
<_foo.eh+0xb4ee8>
   f:    53                       push   %rbx
  10:    48 8d 5f e0              lea    -0x20(%rdi),%rbx
  14:    48 89 77 90              mov    %rsi,-0x70(%rdi)
  18:    5d                       pop    %rbp
  19:    c3                       retq   
===========================================================

mach_override must be choking on the lea instruction.
The easiest way to handle it is to add "48 8d 05 00 00 00 00" to the list of
instructions and mark it as "lea $imm(%rip),%rax". You can also dive into the
opcodes a bit and mask the bits that select the destination register.
I'll take a look at mach_override.c code to suggest the actual patch.