Re: [hatari-devel] Debugger 'n' command

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 10/04/2016 23:40, Eero Tamminen a écrit :

> The reason why it's not currently supported, is that branching
> can also be forwards.  Then "n" command breakpoint for the next
> instruction might never terminate, which IMHO is worse than
> lacking support for skipping loops.
>
> Does somebody feel adding support for determining when instruction
> at PC is a branch going backwards?  :-)

For bne/beq it would be more complicated, but in the case of dbcc it 
will mostly be backward ; dbcc uses 2 words, 1 with the opcode, 1 with 
the displacement ; if the the 2nd word is <0, then it will go backward 
and a breakpoint after the dbcc will work.

format for DBcc is : 0101 cccc 1100 1rrr  . so if ( opcode & 0x50A8 ) == 
0x50a8, then you have a DBcc and you can check the next word.

Nicolas