[syslinux] Can't get COM32 + GDB to work

[H. Peter Anvin]

On 05/19/2010 11:10 AM, Don Hiatt wrote:
> Hey guys,
> 
>    I can't seem to figure out how to debug a COM32 app with GDB under qemu.
> I start "qemu -s" and then "gdb hello.elf ; target remote:1234" but
> can't set any breakpoints
> that work. I"m using syslinux4 (pathbased from the repo).
> 
>   Can anyone verify that they can use qemu+com32+gdb with something as simple as
> com32/samples/hello.c32 ?
> 
>   Also, is it possible to use com32/gdbstub with qemu? (How would you
> connect to qemu's
> serial port)?
> 

You need to tell gdb that the module is loaded at an offset:

gdb core/extlinux.elf
target remote localhost:1234
add-symbol-file com32/samples/hello.elf -s free_high_memory

	-hpa