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* [Bug libc/606] New: profiling causes segfault in gmon mcount on ARM
@ 2004-12-10 20:51 opensource at artnaseef dot com
2004-12-10 20:53 ` [Bug libc/606] " opensource at artnaseef dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: opensource at artnaseef dot com @ 2004-12-10 20:51 UTC (permalink / raw)
To: glibc-bugs
The gmon support for ARM often causes the profiled program to segfault in
_monstartup() due to the allocation memory and setting of pointers; some times
the p->froms pointer is assigned at an offset of 2 from a 4-byte boundary.
Due to the ARM CPU's odd handling of mis-aligned words, this leads to a
segmentation fault.
The ARM CPU (at least in Little Endian Mode) handles mis-aligned accesses
(offset 2 from a word boundary) by adjusting the address back to the immediately
previous 4-byte boundary and swapping the low and high 2-byte words.
--
Summary: profiling causes segfault in gmon mcount on ARM
Product: glibc
Version: 2.3.2
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: gotom at debian dot or dot jp
ReportedBy: opensource at artnaseef dot com
CC: glibc-bugs at sources dot redhat dot com,opensource at
artnaseef dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: arm-linux
GCC target triplet: arm-linux
http://sources.redhat.com/bugzilla/show_bug.cgi?id=606
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* [Bug libc/606] profiling causes segfault in gmon mcount on ARM
2004-12-10 20:51 [Bug libc/606] New: profiling causes segfault in gmon mcount on ARM opensource at artnaseef dot com
@ 2004-12-10 20:53 ` opensource at artnaseef dot com
2004-12-15 12:24 ` gotom at debian dot or dot jp
2005-10-10 14:53 ` drow at sources dot redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: opensource at artnaseef dot com @ 2004-12-10 20:53 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From opensource at artnaseef dot com 2004-12-10 20:53 -------
Created an attachment (id=308)
--> (http://sources.redhat.com/bugzilla/attachment.cgi?id=308&action=view)
suggested fix
This patch fixes the problem, for the ARM architecture only, by adding an
alignment preprocessor macro that can be defined for a specific architecture,
and aligning the pointer assignments in _monstartup() based on this macro.
It also sets the alignment for the ARM architecture to 4 bytes.
--
http://sources.redhat.com/bugzilla/show_bug.cgi?id=606
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* [Bug libc/606] profiling causes segfault in gmon mcount on ARM
2004-12-10 20:51 [Bug libc/606] New: profiling causes segfault in gmon mcount on ARM opensource at artnaseef dot com
2004-12-10 20:53 ` [Bug libc/606] " opensource at artnaseef dot com
@ 2004-12-15 12:24 ` gotom at debian dot or dot jp
2005-10-10 14:53 ` drow at sources dot redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: gotom at debian dot or dot jp @ 2004-12-15 12:24 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From gotom at debian dot or dot jp 2004-12-15 12:24 -------
Your suggested patch adds padding space for the start point of
p->kcount and p->froms. This means p->tossize or p->kcountsize may
have unaligned size. However, p->kcountsize is multiplied by
sizeof(*p->froms) and p->tossize is also multiplied by sizeof(struct
tostruct). I think they should be 4-bytes aligned, but isn't it true
on your system?
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
http://sources.redhat.com/bugzilla/show_bug.cgi?id=606
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* [Bug libc/606] profiling causes segfault in gmon mcount on ARM
2004-12-10 20:51 [Bug libc/606] New: profiling causes segfault in gmon mcount on ARM opensource at artnaseef dot com
2004-12-10 20:53 ` [Bug libc/606] " opensource at artnaseef dot com
2004-12-15 12:24 ` gotom at debian dot or dot jp
@ 2005-10-10 14:53 ` drow at sources dot redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: drow at sources dot redhat dot com @ 2005-10-10 14:53 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From drow at sources dot redhat dot com 2005-10-10 14:53 -------
This should be fixed by:
2003-11-15 Randolph Chung <tausq@debian.org>
* gmon/gmon.c (__monstartup): Round kcountsize to multiples of
the froms[] array so the array is properly aligned.
This was not in 2.3.2.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=606
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2004-12-10 20:51 [Bug libc/606] New: profiling causes segfault in gmon mcount on ARM opensource at artnaseef dot com
2004-12-10 20:53 ` [Bug libc/606] " opensource at artnaseef dot com
2004-12-15 12:24 ` gotom at debian dot or dot jp
2005-10-10 14:53 ` drow at sources dot redhat dot com
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