Debugging a GRUB2 EFI image running on QEMU

What i want to achieve

I want to customize the GRUB EFI image and debug it while running in QEMU.

So I'm trying to debug the vanilla GRUB image before setting it up.

What have I done so far

I downloaded GRUB2 from http://git.savannah.gnu.org and compiled it:

./autogen.sh
./configure --prefix=`pwd`/local --with-platform=efi --target=i386 CFLAGS=-g
make
make install

      

        
        
        
      

    

Then a trivial EFI image is generated with:

./local/bin/grub-mkstandalone -O i386-efi -o bootIA32.efi

      

        
        
        
      

    

And place it in your disk image file:

qemu-img create -f raw hda.img 1G
mkfs.fat hda.img
sudo mount -o uid=$UID hda.img /mnt
mkdir -p /mnt/efi/boot/
mv bootIA32.efi /mnt/efi/boot/
sudo umount /mnt

      

        
        
        
      

    

To download it, I compiled IA32 OVMF.fd to use it with QEMU:

qemu-system-i386 -bios $UDK_PATH/Build/OvmfIa32/RELEASE_GCC48/FV/OVMF.fd \
                 -hda hda.img

      

        
        
        
      

    

It boots correctly, giving me a grub shell.

Where i am stuck

Now I want to debug GRUB. Therefore, I called QEMU additional parameters:

qemu-system-i386 -bios $UDK_PATH/Build/OvmfIa32/RELEASE_GCC48/FV/OVMF.fd \
                 -hda hda.img \
                 -s -S

      

        
        
        
      

    

And attached gdb to QEMU:

cd grub-core/
gdb -x gdb_grub

      

        
        
        
      

    

However, it seems that the debug symbols are missing:

GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
(...)
For help, type "help".
Type "apropos word" to search for commands related to "word".
0x0000fff0 in grub_disk_cache_table ()
Breakpoint 1 at 0x49b1: file kern/dl.c, line 53.
(gdb) n
Single stepping until exit from function grub_disk_cache_table,
which has no line number information.
0xffffff75 in ?? ()
(gdb)

      

        
        
        
      

    

What am I doing wrong?

After adding symbols

@unixsmurf seems to load debug symbols when I use the command symbol-file

. Indeed gdb says

(gdb) symbol-file ../local/lib/grub/i386-efi/kernel.exec
Reading symbols from ../local/lib/grub/i386-efi/kernel.exec...done.

      

        
        
        
      

    

However, I still cannot execute the command next

that returns

(gdb) n
Single stepping until exit from function grub_disk_cache_table,
which has no line number information.
0xffffff75 in ?? ()

      

        
        
        
      

    

I would like, for example, to set a breakpoint at grub_core/kern/main.c:grub_main

and execute it step by step.

But although a breakpoint is set, when I continue

execute, GRUB reaches the shell without stopping at the breakpoint:

(gdb) b main.c:grub_main
Note: breakpoint 2 also set at pc 0x6082.
Breakpoint 3 at 0x6082: file kern/main.c, line 266.
(gdb) c
Continuing.