* Dynamic Linking
@ 2000-01-17 14:23 Grant Carter
0 siblings, 0 replies; 2+ messages in thread
From: Grant Carter @ 2000-01-17 14:23 UTC (permalink / raw)
To: linuxppc-embedded
Hi
I have been following the thread "Cross-compile Applications for 860 on
x86" and am running into similar problems. I have tried the solutions
that have been suggested but have had no success. Perhaps those
concerned have had private email conversations in which the solution has
been found, but since I cannot find one in the archives that helps me,
I'll post this question. Apologies for its length.
I am trying to get a hello world up and running using dynamically linked
libraries. The statically linked version works fine, so I presume that
the libraries are all fine. I am using linux-2.2.13 with no kernel
floating point support, but all the libraries and executables are
compiled with -msoft-float. I am using SASH-2.1 and it works fine. My
problem is that whenever I run something that I have compiled with the
dynamic linker, it exits on Signal 11.
I have made sure that LD_LIBRARY_PATH is set to /lib (it seems that I
had to do this even though all my libraries are in /lib as without it I
get a
./hello: error in loading shared libraries: libc.so.6: cannot open
shared object file: No such file or directory
Doing a "strings" on the file shows that it is looking in /lib for
ld.so.1.)
---------------------------------
>powerpc-linux-strings hello
/lib/ld.so.1
__gmon_start__
libc.so.6
printf
_IO_stdin_used
__libc_start_main
GLIBC_2.0
}a[xN
Grant was here!
-----------------------------------
Anyhow, once the LD_LIBRARY_PATH has been set, the libraries are loaded
(or so it seems) Now everything that I run exits with Signal 11. I used
objdump -p on the main executable and saw that it required libc.so.6.
This exists in my /lib directory
-----------------------------------
>powerpc-linux-objdump -p hello
hello: file format elf32-powerpc
<snip>
Dynamic Section:
NEEDED libc.so.6
INIT 0x100003c8
FINI 0x100003ec
HASH 0x10000150
STRTAB 0x100001c8
SYMTAB 0x10000178
STRSZ 0x42
SYMENT 0x10
DEBUG 0x0
PLTGOT 0x100104f8
PLTRELSZ 0x18
PLTREL 0x7
JMPREL 0x10000240
RELA 0x10000240
RELASZ 0x18
RELAENT 0xc
VERNEED 0x10000220
VERNEEDNUM 0x1
VERSYM 0x10000214
Version References:
required from libc.so.6:
0x0d696910 0x00 02 GLIBC_2.0
-----------------------------------
Doing the same thing on libc.so.6, I get the following:
-----------------------------------
>powerpc-linux-objdump -p libc.so.6
libc.so.6: file format elf32-powerpc
Program Header:
<snip>
Dynamic Section:
NEEDED ld.so.1
SONAME libc.so.6
INIT 0x21cb8
FINI 0xe0fc8
HASH 0xf4
STRTAB 0x9d0c
SYMTAB 0x2cdc
STRSZ 0x7ca2
SYMENT 0x10
PLTGOT 0x103a9c
PLTRELSZ 0x150c
PLTREL 0x7
JMPREL 0x204d8
RELA 0x128c4
RELASZ 0xf2dc
RELAENT 0xc
VERDEF 0x127e0
VERDEFNUM 0x5
VERNEED 0x12884
VERNEEDNUM 0x1
VERSYM 0x119da
Version definitions:
1 0x01 0x0865f4e6 libc.so.6
2 0x00 0x0d696910 GLIBC_2.0
3 0x00 0x0d696911 GLIBC_2.1
GLIBC_2.0
4 0x00 0x09691f71 GLIBC_2.1.1
GLIBC_2.1
5 0x00 0x09691f72 GLIBC_2.1.2
GLIBC_2.1.1
Version References:
required from ld.so.1:
0x09691f71 0x00 08 GLIBC_2.1.1
0x0d696911 0x00 07 GLIBC_2.1
0x0d696910 0x00 06 GLIBC_2.0
-----------------------------------
And now for ld.so.1
-----------------------------------
>powerpc-linux-objdump -p ld.so.1
ld.so.1: file format elf32-powerpc
Program Header:
<snip>
Dynamic Section:
SONAME ld.so.1
HASH 0x94
STRTAB 0x838
SYMTAB 0x2f8
STRSZ 0xcfc
SYMENT 0x10
PLTGOT 0x25fd4
PLTRELSZ 0x12c
PLTREL 0x7
JMPREL 0x2ab0
RELA 0x167c
RELASZ 0x1560
RELAENT 0xc
VERDEF 0x15fc
VERDEFNUM 0x4
VERSYM 0x1554
Version definitions:
1 0x01 0x0275a261 ld.so.1
2 0x00 0x0d696910 GLIBC_2.0
3 0x00 0x0d696911 GLIBC_2.1
GLIBC_2.0
4 0x00 0x09691f71 GLIBC_2.1.1
GLIBC_2.1
-----------------------------------
So in summary, it seems that I have all of the required libraries
(ld.so.1 and libc.so.6) in the right place (/lib) as pointed to my
LD_LIBRARY_PATH and still I get a Signal 11 exit when trying to run it.
Any ideas would be greatly appreciated.
Regards
Grant
--
Grant Carter gcarter@eng.uct.ac.za
Department of Electrical Engineering University of Cape Town
Tel: +27 (0)21 650-3467 Fax: +27 (0)21 650-3465
"Coffee not found - operator halted!"
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 2+ messages in thread
* RE: Dynamic Linking
@ 2000-01-18 15:00 Jeffrey R. Millar
0 siblings, 0 replies; 2+ messages in thread
From: Jeffrey R. Millar @ 2000-01-18 15:00 UTC (permalink / raw)
To: 'gcarter@eng.uct.ac.za'
Cc: 'linuxppc-embedded@lists.linuxppc.org'
Here's a script to test the type of library used by a program. It was
written by an engineer here at Transcept. I'll let him take credit
personally
if he wants to.
jeff
#!/bin/sh
if test $# = 0; then
echo Usage: xfile FILE ...
exit
fi
for i in "$@"; do
echo -n "$i: "
if test -f "$i"; then
:
else
echo "doesn't exist"
continue
fi
if file "$i" 2>&1 | grep -q "dynamically linked"; then
echo -n "Dynamically linked "
elif file "$i" 2>&1 | grep -q "statically linked"; then
echo -n "Statically linked "
else
echo "Not an executable"
continue
fi
if readelf -S "$i" 2>&1 | grep -q "\.note\.ABI-tag";
then
echo "with GNU Libc 2"
else
echo "with old Libc"
fi
done
> ----- Original Message -----
> From: "Grant Carter" <gcarter@eng.uct.ac.za>
> To: "linuxppc-embedded" <linuxppc-embedded@lists.linuxppc.org>
> Sent: Monday, January 17, 2000 9:23 AM
> Subject: Dynamic Linking
>
> >
> > Hi
> >
> > I have been following the thread "Cross-compile Applications for 860
> on
> > x86" and am running into similar problems. I have tried the
> solutions
> > that have been suggested but have had no success. Perhaps those
> > concerned have had private email conversations in which the solution
> has
> > been found, but since I cannot find one in the archives that helps
> me,
> > I'll post this question. Apologies for its length.
> >
> > I am trying to get a hello world up and running using dynamically
> linked
> > libraries. The statically linked version works fine, so I presume
> that
> > the libraries are all fine. I am using linux-2.2.13 with no kernel
> > floating point support, but all the libraries and executables are
> > compiled with -msoft-float. I am using SASH-2.1 and it works fine.
> My
> > problem is that whenever I run something that I have compiled with
> the
> > dynamic linker, it exits on Signal 11.
> >
> > I have made sure that LD_LIBRARY_PATH is set to /lib (it seems that
> I
> > had to do this even though all my libraries are in /lib as without
> it I
> > get a
> >
> > ./hello: error in loading shared libraries: libc.so.6: cannot open
> > shared object file: No such file or directory
> >
> > Doing a "strings" on the file shows that it is looking in /lib for
> > ld.so.1.)
> >
> > ---------------------------------
> > >powerpc-linux-strings hello
> > /lib/ld.so.1
> > __gmon_start__
> > libc.so.6
> > printf
> > _IO_stdin_used
> > __libc_start_main
> > GLIBC_2.0
> > }a[xN
> > Grant was here!
> > -----------------------------------
> >
> > Anyhow, once the LD_LIBRARY_PATH has been set, the libraries are
> loaded
> > (or so it seems) Now everything that I run exits with Signal 11. I
> used
> > objdump -p on the main executable and saw that it required
> libc.so.6.
> > This exists in my /lib directory
> > -----------------------------------
> > >powerpc-linux-objdump -p hello
> >
> > hello: file format elf32-powerpc
> >
> > <snip>
> >
> > Dynamic Section:
> > NEEDED libc.so.6
> > INIT 0x100003c8
> > FINI 0x100003ec
> > HASH 0x10000150
> > STRTAB 0x100001c8
> > SYMTAB 0x10000178
> > STRSZ 0x42
> > SYMENT 0x10
> > DEBUG 0x0
> > PLTGOT 0x100104f8
> > PLTRELSZ 0x18
> > PLTREL 0x7
> > JMPREL 0x10000240
> > RELA 0x10000240
> > RELASZ 0x18
> > RELAENT 0xc
> > VERNEED 0x10000220
> > VERNEEDNUM 0x1
> > VERSYM 0x10000214
> >
> > Version References:
> > required from libc.so.6:
> > 0x0d696910 0x00 02 GLIBC_2.0
> > -----------------------------------
> >
> > Doing the same thing on libc.so.6, I get the following:
> >
> > -----------------------------------
> > >powerpc-linux-objdump -p libc.so.6
> >
> > libc.so.6: file format elf32-powerpc
> >
> > Program Header:
> > <snip>
> >
> > Dynamic Section:
> > NEEDED ld.so.1
> > SONAME libc.so.6
> > INIT 0x21cb8
> > FINI 0xe0fc8
> > HASH 0xf4
> > STRTAB 0x9d0c
> > SYMTAB 0x2cdc
> > STRSZ 0x7ca2
> > SYMENT 0x10
> > PLTGOT 0x103a9c
> > PLTRELSZ 0x150c
> > PLTREL 0x7
> > JMPREL 0x204d8
> > RELA 0x128c4
> > RELASZ 0xf2dc
> > RELAENT 0xc
> > VERDEF 0x127e0
> > VERDEFNUM 0x5
> > VERNEED 0x12884
> > VERNEEDNUM 0x1
> > VERSYM 0x119da
> >
> > Version definitions:
> > 1 0x01 0x0865f4e6 libc.so.6
> > 2 0x00 0x0d696910 GLIBC_2.0
> > 3 0x00 0x0d696911 GLIBC_2.1
> > GLIBC_2.0
> > 4 0x00 0x09691f71 GLIBC_2.1.1
> > GLIBC_2.1
> > 5 0x00 0x09691f72 GLIBC_2.1.2
> > GLIBC_2.1.1
> >
> > Version References:
> > required from ld.so.1:
> > 0x09691f71 0x00 08 GLIBC_2.1.1
> > 0x0d696911 0x00 07 GLIBC_2.1
> > 0x0d696910 0x00 06 GLIBC_2.0
> > -----------------------------------
> >
> > And now for ld.so.1
> >
> > -----------------------------------
> > >powerpc-linux-objdump -p ld.so.1
> >
> > ld.so.1: file format elf32-powerpc
> >
> > Program Header:
> > <snip>
> > Dynamic Section:
> > SONAME ld.so.1
> > HASH 0x94
> > STRTAB 0x838
> > SYMTAB 0x2f8
> > STRSZ 0xcfc
> > SYMENT 0x10
> > PLTGOT 0x25fd4
> > PLTRELSZ 0x12c
> > PLTREL 0x7
> > JMPREL 0x2ab0
> > RELA 0x167c
> > RELASZ 0x1560
> > RELAENT 0xc
> > VERDEF 0x15fc
> > VERDEFNUM 0x4
> > VERSYM 0x1554
> >
> > Version definitions:
> > 1 0x01 0x0275a261 ld.so.1
> > 2 0x00 0x0d696910 GLIBC_2.0
> > 3 0x00 0x0d696911 GLIBC_2.1
> > GLIBC_2.0
> > 4 0x00 0x09691f71 GLIBC_2.1.1
> > GLIBC_2.1
> > -----------------------------------
> >
> > So in summary, it seems that I have all of the required libraries
> > (ld.so.1 and libc.so.6) in the right place (/lib) as pointed to my
> > LD_LIBRARY_PATH and still I get a Signal 11 exit when trying to run
> it.
> >
> > Any ideas would be greatly appreciated.
> >
> > Regards
> > Grant
> >
> > --
> > Grant Carter gcarter@eng.uct.ac.za
> > Department of Electrical Engineering University of Cape Town
> > Tel: +27 (0)21 650-3467 Fax: +27 (0)21 650-3465
> > "Coffee not found - operator halted!"
> >
> >
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
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