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[Bug dynamic-link/19679] gcc-4.9.3 C++ exception handling broken due to unaligned stack
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Mon, 22 Feb 2016 17:47:47 +0000
- Subject: [Bug dynamic-link/19679] gcc-4.9.3 C++ exception handling broken due to unaligned stack
- Auto-submitted: auto-generated
- References: <bug-19679-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19679
--- Comment #6 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
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The branch, release/2.23/master has been updated
via 6094fc2cf7eab30889df0416a5c051a5e7171895 (commit)
from e742928c1592b43db6809db4f39e67be151cdd27 (commit)
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- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6094fc2cf7eab30889df0416a5c051a5e7171895
commit 6094fc2cf7eab30889df0416a5c051a5e7171895
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Feb 22 09:32:57 2016 -0800
[x86_64] Set DL_RUNTIME_UNALIGNED_VEC_SIZE to 8
Due to GCC bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
__tls_get_addr may be called with 8-byte stack alignment. Although
this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
that stack will be always aligned at 16 bytes. Since SSE optimized
memory/string functions with aligned SSE register load and store are
used in the dynamic linker, we must set DL_RUNTIME_UNALIGNED_VEC_SIZE
to 8 so that _dl_runtime_resolve_sse will align the stack before
calling _dl_fixup:
Dump of assembler code for function _dl_runtime_resolve_sse:
0x00007ffff7deea90 <+0>: push %rbx
0x00007ffff7deea91 <+1>: mov %rsp,%rbx
0x00007ffff7deea94 <+4>: and $0xfffffffffffffff0,%rsp
^^^^^^^^^^^ Align stack to 16 bytes
0x00007ffff7deea98 <+8>: sub $0x100,%rsp
0x00007ffff7deea9f <+15>: mov %rax,0xc0(%rsp)
0x00007ffff7deeaa7 <+23>: mov %rcx,0xc8(%rsp)
0x00007ffff7deeaaf <+31>: mov %rdx,0xd0(%rsp)
0x00007ffff7deeab7 <+39>: mov %rsi,0xd8(%rsp)
0x00007ffff7deeabf <+47>: mov %rdi,0xe0(%rsp)
0x00007ffff7deeac7 <+55>: mov %r8,0xe8(%rsp)
0x00007ffff7deeacf <+63>: mov %r9,0xf0(%rsp)
0x00007ffff7deead7 <+71>: movaps %xmm0,(%rsp)
0x00007ffff7deeadb <+75>: movaps %xmm1,0x10(%rsp)
0x00007ffff7deeae0 <+80>: movaps %xmm2,0x20(%rsp)
0x00007ffff7deeae5 <+85>: movaps %xmm3,0x30(%rsp)
0x00007ffff7deeaea <+90>: movaps %xmm4,0x40(%rsp)
0x00007ffff7deeaef <+95>: movaps %xmm5,0x50(%rsp)
0x00007ffff7deeaf4 <+100>: movaps %xmm6,0x60(%rsp)
0x00007ffff7deeaf9 <+105>: movaps %xmm7,0x70(%rsp)
[BZ #19679]
* sysdeps/x86_64/dl-trampoline.S (DL_RUNIME_UNALIGNED_VEC_SIZE):
Renamed to ...
(DL_RUNTIME_UNALIGNED_VEC_SIZE): This. Set to 8.
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This. Updated.
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
* sysdeps/x86_64/dl-trampoline.h
(DL_RUNIME_RESOLVE_REALIGN_STACK): Renamed to ...
(DL_RUNTIME_RESOLVE_REALIGN_STACK): This.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 14 ++++++++++++++
sysdeps/x86_64/dl-trampoline.S | 20 ++++++++++++--------
sysdeps/x86_64/dl-trampoline.h | 6 +++---
3 files changed, 29 insertions(+), 11 deletions(-)
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