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src/gdb rs6000-aix-tdep.c ChangeLog
- From: brobecke at sourceware dot org
- To: gdb-cvs at sourceware dot org
- Date: 20 Apr 2010 22:38:55 -0000
- Subject: src/gdb rs6000-aix-tdep.c ChangeLog
CVSROOT: /cvs/src
Module name: src
Changes by: brobecke@sourceware.org 2010-04-20 22:38:54
Modified files:
gdb : rs6000-aix-tdep.c ChangeLog
Log message:
[AIX] Memory error while checking if pointer is descriptor.
A long time ago (Oct 2009), I noticed a problem on AIX, where something
failed with an error while the debugger was checking whether an address
was a descriptor or not. Unfortunately, like an idiot, I forgot to write
notes about the scenario where the problem occured - I am usually pretty
meticulous about that because my memory of these things is really bad.
I hope you'll forgive me for not providing a solid testcase - if it's
any consolation, I've searched for a long time before giving up :-(.
Based on the testsuite reports that I have, I think that this happened
while inserting a breakpoint, as follow:
(gdb) break x
Cannot access memory at address 0x200093b4
What happened is that rs6000_convert_from_func_ptr_addr tried to read
the memory at the given address, and fail because of an exception.
It seems pretty clear that, if the address was in fact a descriptor,
GDB would have been able to read the target memory region.
So this patch protects the memory-read against exceptions, and treats
such exceptions as an indication that our address is not a descriptor.
gdb/ChangeLog:
* rs6000-aix-tdep.c: #include exceptions.h.
(rs6000_convert_from_func_ptr_addr): If an exception is thrown
while reading the memory at ADDR, then ADDR cannot be a function
descriptor.
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/rs6000-aix-tdep.c.diff?cvsroot=src&r1=1.16&r2=1.17
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.11655&r2=1.11656