Re: arm core analysis on x86 host

[Jon Ringle <jon dot ringle at comdial dot com>]

On Tuesday 29 March 2005 11:53, Daniel Jacobowitz wrote:
> On Tue, Mar 29, 2005 at 11:39:15AM -0500, Jon Ringle wrote:
> > On Tuesday 29 March 2005 11:33, Daniel Jacobowitz wrote:
> > > On Tue, Mar 29, 2005 at 11:13:53AM -0500, Jon Ringle wrote:
> > > > On Monday 28 March 2005 23:58, Daniel Jacobowitz wrote:
> > > > > Look harder :-)  sniff_core_bfd is disabled if you provide the new
> > > > > mechanism.  It should be all you need.
> > > >
> > > > I assume that you are refering to the test that is done at the
> > > > beginning of sniff_core_bfd():
> > > >   /* Don't sniff if we have support for register sets in
> > > > CORE_GDBARCH. */ if (core_gdbarch &&
> > > > gdbarch_regset_from_core_section_p (core_gdbarch)) return NULL;
> > > >
> > > > Howerver, the value of core_gdbarch is not the same as the gdbarch
> > > > that was used for the set_gdbarch_regset_from_core_section() causing
> > > > the test to fail and fall through to the core_file_fns loop.
> > >
> > > The two being different is not a problem; however, the question is why
> > > they are so different that they do not both pass through wherever you
> > > are calling set_gdbarch_regset_from_core_section.
> > >
> > > At least two gdbarches will be constructed before the core file is
> > > opened, but you only show one call to
> > > set_gdbarch_regset_from_core_section.
> > >
> > > Where did you put it?
> >
> > I put a call to set_gdbarch_regset_from_core_section at the end of
> > arm_linux_init_abi(), just like ppc_linux_init_abi().
>
> Trace through the gdbarch initialization to see what's going on, then.
> The core file may not be recognized as a Linux object.  This has
> happened on other platforms; I don't know what was done about it, but
> maybe Mark remembers.

Daniel,

Is the problem that the osabi for the file and target don't match?

(gdb) file ippbx.gdb
find_arch_by_info: info.bfd_arch_info arm
find_arch_by_info: info.byte_order 1 (little)
find_arch_by_info: info.osabi 5 (GNU/Linux)
find_arch_by_info: info.abfd 0x849e558
find_arch_by_info: info.tdep_info 0x0
find_arch_by_info: Previous architecture 0x0848e430 (arm) selected
Reading symbols 
from /home/ringlej/mp1000/trunk-fixes/Soundpipe/ippbx/ippbx.gdb...done.
(gdb) target core ./core
find_arch_by_info: info.bfd_arch_info arm
find_arch_by_info: info.byte_order 1 (little)
find_arch_by_info: info.osabi 21 (ARM APCS)
find_arch_by_info: info.abfd 0x84a0450
find_arch_by_info: info.tdep_info 0x0
find_arch_by_info: New architecture 0x08571958 (arm) selected

Jon