[uClibc]shared library support on linux-MIPS with CONFIG_64BIT_PHYS_ADDR

[Erik Andersen]

On Tue Jul 09, 2002 at 05:05:46PM -0700, Joseph Chiu wrote:
> Hi,
> 
> I've been trying to get linux-MIPS (sourceforge) working with the
> CONFIG_64BIT_PHYS_ADDR turned on so that I can use the PCMCIA on 
> the Alchemy/AMD Au1000.  Although userland programs are supposed 
> to not care about the internal goings on of the kernel, somehow I
> can't get dynamically-linked uclibc programs to run.  
> 
> As I write this, I can not get statically linked uclibc programs
> and statically and dynamically linked glibc programs running.  But
> dynamically linked uclibc programs will not start.  I have the
> uclibc debugging turned on, and have tried using uclibc's shared-
> library loader, and also using the "native" (glibc) shared-library
> loader.
> 
> When I run a test program
>    main(){return 1;}
> 
> Using the uclibc shared-library loader returns an User defined signal 1
> error.

Hmm.  I dunno.  It works for me on my mips test system.  I just
rebuilt uClibc using today's CVS:

    $ cat /proc/cpuinfo | head -n4
    system type             : MIPS Cobalt
    processor               : 0
    cpu model               : Nevada V10.0  FPU V10.0
    BogoMIPS                : 249.85
    $ uname -a
    Linux phoenix 2.4.19-rc1 #13 Wed Jul 3 14:26:21 MDT 2002 mips unknown

    $ cat tiny.c 
    #include <unistd.h>
    int main(void)
    {
	_exit(42);
    }
    $ /usr/mipsel-linux-uclibc/bin/mipsel-uclibc-gcc -Wall -Os -s tiny.c -o tiny
    $ strip -x -R .note -R .comment ./tiny
    $ ls -l ./tiny
    -rwxr-xr-x    1 andersen andersen     4896 Jul 10 01:34 ./tiny*
    $ /usr/mipsel-linux-uclibc/bin/mipsel-uclibc-ldd ./tiny
	    libc.so.0 => /usr/mipsel-linux-uclibc/lib/libc.so.0
	    /usr/mipsel-linux-uclibc/lib/ld-uClibc.so.0 => /usr/mipsel-linux-uclibc/lib/ld-uClibc.so.0
    $ ./tiny
    $ echo $?
    42


Now to try something a bit more complicated:

    $ cat hello.c 
    #include<stdio.h>
    #include <stdlib.h>
    int main(void)
    {
	printf("hello world\n");
	exit(42);
    }
    $ /usr/mipsel-linux-uclibc/bin/mipsel-uclibc-gcc -Wall -Os -s hello.c -o hello
    $ strip -x -R .note -R .comment ./hello
    $ ls -l ./hello
    -rwxr-xr-x    1 andersen andersen     4944 Jul 10 01:36 ./hello*
    $ /usr/mipsel-linux-uclibc/bin/mipsel-uclibc-ldd ./hello
	    libc.so.0 => /usr/mipsel-linux-uclibc/lib/libc.so.0
	    /usr/mipsel-linux-uclibc/lib/ld-uClibc.so.0 => /usr/mipsel-linux-uclibc/lib/ld-uClibc.so.0
    $ ./hello
    hello world


> Using the glibc shared-library loader turns an Illegal Instruction
> error.
> 
> It seems to me, perhaps, that something is going wrong before either
> shared-library loader perform their job?  What code would the
> uclibc-using-glibc-loader and uclibc-using-uclibc-loader programs 
> have in common, that it wouldn't have with glibc-using-glibc-loader
> program?

I'd take a close look at your kernel.  Sounds to me like your kernel
is executing apps with their stack all hosed up.  What kernel are you
using?

 -Erik

--
Erik B. Andersen             http://codepoet-consulting.com/
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