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objcopy error -- was RE: your mail

To: "'Maciej W. Rozycki'" <macro@ds2.pg.gda.pl>
Subject: objcopy error -- was RE: your mail
From: John Van Horne <JohnVan.Horne@cosinecom.com>
Date: Thu, 4 Jan 2001 12:08:25 -0800
Cc: "'linux-mips@oss.sgi.com'" <linux-mips@oss.sgi.com>
Sender: owner-linux-mips@oss.sgi.com

Is there anyway to get more information out of objcopy?  When I run it,
I get the warnings I mentioned before, but no errors, however the target
file is empty.  Here is an abridged copy of what I get:

[jvhorne@guava-lx linux]$ make orionboot
make -C arch/mips/orion orionboot
make[1]: Entering directory `/dvlp/jvhorne/jvh_21_lx_mips_cross_test_sv/vobs/gpl/linux/arch/mips/orion'
mips-linux-objcopy -Obinary --verbose ../../../vmlinux orion.nosym
copy from ../../../vmlinux(elf32-bigmips) to orion.nosym(binary)
BFD: Warning: Writing section `.app_header' to huge (ie negative) file offset 0x800fec30.
BFD: Warning: Writing section `.text' to huge (ie negative) file offset 0x80100c30.
BFD: Warning: Writing section `.fixup' to huge (ie negative) file offset 0x80236930.
BFD: Warning: Writing section `.text.exit' to huge (ie negative) file offset 0x80237830.
.
.
.
mips-linux-objcopy: orion.nosym: File truncated


Do you think that the reason objcopy fails is because it isn't treating
the addresses as 32 bit addresses, or could it be something else?

Thanks,
-John


-----Original Message-----
From: Maciej W. Rozycki [mailto:macro@ds2.pg.gda.pl]
Sent: Thursday, January 04, 2001 8:23 AM
To: Ralf Baechle
Cc: John Van Horne; 'linux-mips@oss.sgi.com'; 'wesolows@foobazco.org'
Subject: Re: your mail


On Thu, 4 Jan 2001, Ralf Baechle wrote:

> > I see that our start address of 0x80102584 has been turned into
> > 0xffffffff80102584. I'm thinking that
> > I need to tell ld something to stop it from doing this. Any ideas?
>
> That's be ok.  32-bit MIPS addresses are sign-extended into 64-bit addresses.
> Older binutils used to zero-extend addresses which was broken.  So what
> you observe is actually the sympthom of a bug that got fixed.

 I'm not sure that's the best solution, I'm afraid.  For elf32-mips
addresses should be 32-bit and not 64-bit.  It would be consistent with
other 32-bit platforms, it would make interoperability easier (ksymoops
cannot make use of System.map to grok kernel oopses which provide 32-bit
addresses) and it would make objdump outputs more readable.

 Fixing this problem with BFD is on my to do list (but has a low priority
assigned).

--
+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+--------------------------------------------------------------+
+        e-mail: macro@ds2.pg.gda.pl, PGP key available        +

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