Re: cross compile gdb-6.8 for xtensa

[Maxim Grigoriev <maxim@tensilica.com>]

Hello Himanshu,

I will look into it and then get back to you.

Thanks,
-- Maxim

On 11/11/2010 01:18 AM, himanshu sardana wrote:
> I am trying to remote debug an single threaded application main_app.c:
>
> =================================================================
> #include<stdio.h>
>
> int main()
> {
>     int i=0;
>
>     i++;
>     printf("main_app: i=%d\n", i);
>
>     i++;
>     printf("main_app: i=%d\n", i);
>
>     i++;
>     printf("main_app: i=%d\n", i);
>
>     return 0;
> }
> ===================================================================
>
> My linux machine is:
> Linux ankit 2.6.18-92.el5 #1 SMP Tue Jun 10 18:49:47 EDT 2008 i686
> i686 i386 GNU/Linux
>
>
> STEP 1
> -----------
> I compiled main_app.c for xtensa on linux machine:
>
> ===================================================================
> CC=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-gcc
> CFLAGS="-g -I/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/include/libxml2"
> LDFLAGS="-L/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/lib"
>
> $CC $CFLAGS -c -o main_app.o main_app.c $LDFLAGS
> $CC $CFLAGS -o main_app main_app.o $LDFLAGS
> ===================================================================
>
>
> STEP 2
> -----------
> I am using gdbserver on the target machine (xtensa_c1lx2-linux) and
> gdb on the host machine (i686-pc-linux-gnu).
>
> Compilation steps for gdb-6.8
>
> ========================================================================
> /*configure and make gdb*/
> gdb-6.8>  ./configure --target=xtensa_c1lx2-linux
>
> gdb-6.8>  make
>
> gdb-6.8>  cd gdb/
>
> gdb-6.8>  ls -ltrh
>
> /*Got gdb binary here*/
>
>
> /*Now configure and make gdbserver*/
> gdb-6.8>  cd gdbserver/
>
> gdb-6.8>  ./configure --build=i686-pc-linux-gnu
> --host=xtensa_c1lx2-linux --target=xtensa_c1lx2-linux
> --includedir=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/include
>   --oldincludedir=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/include
> CC=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-gcc
> CFLAGS="-I/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/include/libxml2"
> CXX=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-g++
> CPPFLAGS="-I/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/include/libxml2"
> LDFLAGS="-L/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/lib"
> STRIP=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-strip
> AR=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-ar
> RANLIB=/opt/buildroot/build_xtensa_c1lx2/staging_dir/usr/bin/xtensa_c1lx2-linux-ranlib
>
> gdb-6.8>  make
>
> gdb-6.8>  ls -ltrh
>
> /*Got gdbserver binary here*/
> ========================================================================
>
>
> STEP 3
> ------------
> Transfer gdbserver and main_app on target machine and then run gdbserver
>
> target>  ./gdbserver 192.168.202.143:2108 ./main_app
> Process ./main_app created; pid = 340
> Listening on port 2108
> Remote debugging from host 192.168.202.184
>
>
> STEP 4
> -----------
>
> linux>  /opt/himanshu/gdb-6.8/gdb/gdb ./main_app
> GNU gdb 6.8
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later<http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "--host=i686-pc-linux-gnu
> --target=xtensa_c1lx2-linux"...
> (gdb) target remote 192.168.202.143:2108
> Remote debugging using 192.168.202.143:2108
> [New Thread 336]
> 0xfc140020 in ?? ()
> (gdb)
>
>
> After these steps if I simply 'continue' the program, the program
> executes fine and then terminates properly. But, If I put a breakpoint
> and then continue execution I get the following problem:
>
> ------------------------------------------------------------------------------------------------------
> (gdb) b main
> Breakpoint 1 at 0x4002b9: file main_app.c, line 5.
> (gdb) c
> Continuing.
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xc7024000 in ?? ()
> (gdb) c
> Continuing.
>
> Program terminated with signal SIGSEGV, Segmentation fault.
> The program no longer exists.
> (gdb) q
> -------------------------------------------------------------------------------------------------------
>
>
> And at gdbserver side:
> -------------------------------------------------------------------------------------------------------
> Child terminated with signal = b
>
> Child terminated with signal = 0xb (SIGSEGV)
> GDBserver exiting
> -------------------------------------------------------------------------------------------------------
>
> What may be the problem due to which I get the above error?
> Am i rightly configuring it in order to cross-compile it for xtensa?
>
> Any suggestions will be highly appreciable.
>
> Thanks,
> Himanshu
>