Re: stepping through a flat binary in qemu

[fpga <mgbg25171@blueyonder.co.uk>]

Michael Snyder-6 wrote:
> 
> fpga wrote:
>> Hi. 
>> I'm trying to step through a tiny real-to-pmode os in qemu using gdb.
>> 
>> I'm using 
>>    nasm -f bin emakeimg.asm -o enth.fbin
>> to assemble the thing and then pasting the 16bit flat binary to a floppy
>> image
>> i.e. no debugging symbols.
>> 
>> I've booted the os in qemu with 
>> "qemu -s -S -fda boot.img -boot a" 
>> & also without "-s" (use gstabs)
>> 
>> In another terminal I debug the same image and connect to qemu via
>> "target remote localhost:1234".
>> If I type "cont" the OS starts to execute.
>> 
>> If I try to step by typing "break" gdb complains about no symbols.
>> Is it possible to step through this 16 bit bootloader code and into the
>> OS
>> proper with no symbols & if not what's the easiest way of putting symbols
>> in.
>> 
>> I have a problem that if I try to assemble as elf, I have multiple [ORG
>> statements in the code] which only bin files recognise.
>> 
>> Any help much appreciated.
> 
> Probably need to use stepi, since step depends on line symbols.
> 
> 
Yes that works
Thanks Michael 

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