Re: [ECOS] objdump for binary file

[Grant Edwards <grante at visi dot com>]

On Tue, Aug 21, 2001 at 09:02:05PM +0100, Jonathan Larmour wrote:
> Grant Edwards wrote:
> > 
> > On Tue, Aug 21, 2001 at 01:23:22PM -0600, Trenton D. Adams wrote:
> > 
> > > I compiled an eCos program and then copied it to a binary file.  Is
> > > there a way of dumping the assembly now?
> > 
> > No.
> 
> Yes :-). It's not pretty and you've lost all the symbol info, but you can
> disassemble everything (including data!). e.g.
> 
> echo > foo.c
> arm-elf-gcc -c -o foo.o foo.c
> arm-elf-objcopy --remove-section=.text foo.o
> arm-elf-objcopy --add-section=.text=thebinfile foo.o
> arm-elf-objcopy --set-section-flags=.text=alloc,load,code,contents,readonly foo.o
> arm-elf-objdump -d foo.o

The bit at the top where you compile an empty C file to
generate all the right sections is clever -- I hadn't thought
of that.

One would hope he kept a copy of the ELF file -- or can
re-generate it.  Making sense of a binary file by disassembling
it requires considerable skill and can use up lots of hours for
a non-trivial program.

-- 
Grant Edwards
grante@visi.com