GDB 6.8 on sparc64-linux not working, idem on powerpc64-linux

Laurent GUERBY laurent@guerby.net
Sat Feb 28 13:31:00 GMT 2009


On Sat, 2009-02-28 at 14:02 +0100, Mark Kettenis wrote:
> > From: Laurent GUERBY <laurent@guerby.net>
> > Date: Sat, 28 Feb 2009 13:36:52 +0100
> > 
> > (gdb) b main
> > Breakpoint 1 at 0x1000044c: file toto.c, line 1.
> > (gdb) r
> > Starting program: /home/guerby/tmp/a.out 
> > warning: no loadable sections found in added symbol-file system-supplied DSO at 0x100000
> > 
> > Program received signal SIGTRAP, Trace/breakpoint trap.
> > 0x1000044c0002d032 in ?? ()
> > (gdb) bt
> > #0  0x1000044c0002d032 in ?? ()
> > #1  0x0007d5a400000000 in ?? ()
> > Cannot access memory at address 0xfffff4f010018940
> > (gdb) n
> > Cannot find bounds of current function
> 
> This (and the sparc64 issue) smells like a mismatch between bitness of
> gdb and the program you're trying to debug.  What does file(1) report
> when you run it on your gdb binary and your program's binary?

I built GDB as 32 bits indeed, I thought the host choice would not impact
the target debugability but it looks like I was wrong. I'm not
familiar (yet) with the GDB documentation, is this mentionned somewhere?

On powerpc64 rebuilding as 64 bits cured the issue, on sparc64 I will
report soon.

Thanks for your help!

Laurent.



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