Date: Fri, 08 Feb 2002 15:01:44 -0800 From: Peter Wemm <peter@wemm.org> To: John Polstra <jdp@polstra.com>, Andrew Gallatin <gallatin@cs.duke.edu>, freebsd-alpha@FreeBSD.ORG Subject: Re: more on recent current alpha rtld/binutils breakage. Message-ID: <20020208230144.AB2893BAC@overcee.wemm.org> In-Reply-To: <20020208224838.2037039F1@overcee.wemm.org>
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Peter Wemm wrote:
> John Polstra wrote:
> > On 08-Feb-02 Andrew Gallatin wrote:
> > >
> > > So its like the _rtld function hasn't been relocated.
> >
> > It's called from rtld-elf/alpha/rtld_start.S, and there's some code
> > just before that point which is supposed to relocate the global
> > offset table in order to make that possible. I think that's the
> > area where things are going wrong.
>
> The relocation records are different now:
This is a red herring. I have found the real problem..
rtld_start.S:
/* Step 2 -- Find bounds of global offset table */
lda t5, _GLOBAL_OFFSET_TABLE_
addq t8, t5, t9 /* add the displacement */
lda t4, _DYNAMIC
addq t8, t4, t10 /* add the displacement */
Note that we assume that the got goes from _GLOBAL_OFFSET_TABLE_ through
to _DYNAMIC. This *was* true on the old ld:
8 .plt 00000000 000000000002d4b8 000000000002d4b8 0001d4b8 2**3
CONTENTS, ALLOC, LOAD, CODE
9 .got 00000bf8 000000000002d4b8 000000000002d4b8 0001d4b8 2**3
CONTENTS, ALLOC, LOAD, DATA
10 .dynamic 000000b0 000000000002e0b0 000000000002e0b0 0001e0b0 2**3
CONTENTS, ALLOC, LOAD, DATA
..
but on the new ld:
8 .dynamic 00000100 000000000002d390 000000000002d390 0001d390 2**3
CONTENTS, ALLOC, LOAD, DATA
9 .plt 00000000 000000000002d490 000000000002d490 0001d490 2**3
CONTENTS, ALLOC, LOAD, CODE
10 .got 00000c00 000000000002d490 000000000002d490 0001d490 2**3
CONTENTS, ALLOC, LOAD, DATA
11 .sbss 00000108 000000000002e090 000000000002e090 0001e090 2**3
ALLOC, SMALL_DATA
ie: our end point calculation of the end of the GOT is hosed since _DYNAMIC
is *before* _GLOBAL_OFFSET_TABLE_ now, not at the end point.
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5
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