* Need ld.so help
@ 1998-12-27 4:49 Dan Malek
1998-12-27 12:05 ` Gary Thomas
0 siblings, 1 reply; 2+ messages in thread
From: Dan Malek @ 1998-12-27 4:49 UTC (permalink / raw
To: linuxppc-dev
I discovered the problem I am having with the embedded 8xx
processors and cache is that there are several assumptions
about cache block size in various functions. The 8xx processors
have a 4 word (16 byte) cache line while other PPCs have
a 8 word line. This causes problems when trying to flush and
invalidate caches.
One place this is done is dynamic linking functions of ld.so,
where it is assumed a cache line is 8 words. Unfortunately,
I have been unable to build ld.so from the glibc SRPM. I am
using the 961212-1h SRPM from the linuxppc.org server, and
the appropriate egcs and binutils. All of the other libraries
I build from this SRPM are fine. From looking at the RPM of
the same version, all of the resulting *.so files appear to be
nearly identical, except for ld.so which is much larger than
found in the RPM.
The details....I have tracked it down to the elf_get_dynamic_info()
function, called from _dl_start(). The failure occurs following
the 'while' loop. It appears info[DT_RELA] is OK, or at least
not NULL. However, info[DT_RELAENT] is NULL, causing the
program to segfault at this point.
I don't understand enough about the libraries to know where to
look from here, so I need some help :-)
Oh yeah, the SRPM didn't build quite right. I had to hand patch
stdlib/exit.c.....
Thanks.
-- Dan
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* RE: Need ld.so help
1998-12-27 4:49 Need ld.so help Dan Malek
@ 1998-12-27 12:05 ` Gary Thomas
0 siblings, 0 replies; 2+ messages in thread
From: Gary Thomas @ 1998-12-27 12:05 UTC (permalink / raw
To: Dan Malek; +Cc: linuxppc-dev
On 27-Dec-98 Dan Malek wrote:
>
> I discovered the problem I am having with the embedded 8xx
> processors and cache is that there are several assumptions
> about cache block size in various functions. The 8xx processors
> have a 4 word (16 byte) cache line while other PPCs have
> a 8 word line. This causes problems when trying to flush and
> invalidate caches.
>
> One place this is done is dynamic linking functions of ld.so,
> where it is assumed a cache line is 8 words. Unfortunately,
> I have been unable to build ld.so from the glibc SRPM. I am
> using the 961212-1h SRPM from the linuxppc.org server, and
> the appropriate egcs and binutils. All of the other libraries
> I build from this SRPM are fine. From looking at the RPM of
> the same version, all of the resulting *.so files appear to be
> nearly identical, except for ld.so which is much larger than
> found in the RPM.
>
> The details....I have tracked it down to the elf_get_dynamic_info()
> function, called from _dl_start(). The failure occurs following
> the 'while' loop. It appears info[DT_RELA] is OK, or at least
> not NULL. However, info[DT_RELAENT] is NULL, causing the
> program to segfault at this point.
>
> I don't understand enough about the libraries to know where to
> look from here, so I need some help :-)
>
> Oh yeah, the SRPM didn't build quite right. I had to hand patch
> stdlib/exit.c.....
>
I'm confused. Are all of these problems attributable to the cache-line
size stuff? Or are there other problems?
I [obviously] build the libraries directly from the SRPMS, so I'd like
to understand what your problems are.
Which software pieces are you running?
EGCS?
BINUTILS?
GLIBC?
Kernel?
------------------------------------------------------------------------
Gary Thomas |
email: gdt@linuxppc.org | "Fine wine is a necessity of
... opinions expressed here are mine | life for me"
and no one else would claim them! |
| Thomas Jefferson
------------------------------------------------------------------------
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