Re: debugging something with multiple text sections in one compilation unit

[Daniel Jacobowitz <drow@false.org>]

On Fri, Aug 03, 2007 at 12:09:46AM -0400, Robin Getz wrote:
> As far as we can tell - there seems to be a limitation in DWARF spec (or DWARF 
> implementation of gcc/gdb) - there seems to be only only one single base 
> address. All other addresses are an offset to that base in the same 
> compilation unit. 
> 
> When we use l1_text attribute, we have two code segments in one compilation 
> unit and the offset between them is determined only when it's loaded. So one 
> segment cannot get symbol addresses computed correctly - and we can not set 
> breakpoints in functions that are in L1, and debugging applications is pretty 
> difficult.

There is no requirement to use a single base address in DWARF, or in
GDB's implementation of it; just use .debug_aranges.  GCC does the
right thing if you use __attribute__((section)).

You're supposed to tell GDB the section offsets, so that it can adjust
debug info appropriately.  See add-symbol-file in the manual.  There's
no way yet to do this automatically for a single section, though; only
by hand.

-- 
Daniel Jacobowitz
CodeSourcery