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rtld, i386: Fix cfi directive in audit trampoline code 

_dl_runtime_profile function has wrong cfi directive when
rewinding stack back for the pltexit path.

Only 8 bytes - 2 'pop edx' instructions from the pltentry-only
code should be rewinded back.

With attached patch, I'm able to rewind stack correctly
throught the rtld code from audit library callback.
This commit is contained in:
Jiri Olsa 2011-08-29 09:14:51 -04:00 committed by Ulrich Drepper
parent ad69cc2652
commit fbeb5f4db1
2 changed files with 7 additions and 2 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2011-08-29 Jiri Olsa <jolsa@redhat.com>
* sysdeps/i386/dl-trampoline.S (_dl_runtime_profile): Fix cfi
directive.
2011-08-24 David S. Miller <davem@davemloft.net> 2011-08-24 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/sparc64/strcmp.S: Rewrite. * sysdeps/sparc/sparc64/strcmp.S: Rewrite.

4
sysdeps/i386/dl-trampoline.S
View File

@ -1,5 +1,5 @@
/* PLT trampolines. i386 version. /* PLT trampolines. i386 version.
Copyright (C) 2004, 2005, 2007 Free Software Foundation, Inc. Copyright (C) 2004, 2005, 2007, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -99,7 +99,7 @@ _dl_runtime_profile:
+4 %edx +4 %edx
%esp free %esp free
*/ */
cfi_adjust_cfa_offset (12) cfi_adjust_cfa_offset (8)
1: movl %ebx, (%esp) 1: movl %ebx, (%esp)
cfi_rel_offset (ebx, 0) cfi_rel_offset (ebx, 0)
movl %edx, %ebx # This is the frame buffer size movl %edx, %ebx # This is the frame buffer size