Re: THUMB code detection for ADS 1.2 ELF emages

[Stan Shebs <stan at codesourcery dot com>]

Dmitry Smirnov wrote:
> Hi,
>
> I'm trying to use GDB to work with ARM ELF images produced by ADS 1.2 (ARM toolchain, a liitle bit old).
> I can do almost all I want with ARM code. But GDB works incorrectly with THUMB code: I cannot disassemle the code, GDB places breakpoints at incorrect address, stepping with 'ni'.
>
> In GDB source code I've found that it completely ignores some special symbols ($t, $a, $d ...) that ADS places to an ELF file.
>   
Dan Jacobowitz added this bit of machinery recently; see 
http://sourceware.org/ml/gdb-patches/2008-05/msg00113.html . He points 
out that this should be a rare case, only needed if Arm and Thumb code 
are mixed within a single file; so if your GDB is having trouble 
detecting Thumb code, maybe there is some other problem, perhaps the 
toolchain is not marking the executable correctly?

Stan