Re: [Valgrind-users] Valgrind Dwarf support on ARM

[Tom H. <to...@co...>]

On 21/09/11 22:05, Wickham, Mark wrote:

> The problem is that the symbols are packed, and therefore some of the items are misaligned and on ARM, that typically causes a fault, but on this processor it is reading incorrect values from misaligned addresses.  For example, a 32-bit read at an odd address results in a totally bogus value.

Oh sure, doing unaligned reads on an ARM that isn't in strict alignment 
mode will get what appear to be undefined values. They are actually well 
defined, they're just not what you would expect unless you'd been 
reading the processor manual...

> I think replacing all of the *(UShort *) and *(UInt *) and *(ULong *) expressions in coregrind/m_debuginfo/readdwarf.c with read_UShort() and friends would solve the problem.  I was able to verify that it works better if I use this function for the version number reading - now I get DWARF version 2, instead of 512 or 1024.

Sounds like it, yes.

Can you open a bug with this information on it please.

Tom

-- 
Tom Hughes (to...@co...)
http://compton.nu/