* implementing stepi
@ 2005-04-29 13:03 Decker, Paul
2005-04-29 15:15 ` Daniel Jacobowitz
0 siblings, 1 reply; 2+ messages in thread
From: Decker, Paul @ 2005-04-29 13:03 UTC (permalink / raw)
To: gdb
hello everyone,
I have what I believe is a simple question on the implementation of the
stepi feature. Some processors provide a mechanism to step exactly one
instruction, such as a special bit in a debug control register. While
other processors don't provide this capability, and to implement a step,
breakpoints must be sprinkled in various places, and a run (to the
breakpoint) performed. Looking at some of the gdb source, it seems
that stepi is implemented using the breakpoint method. In doing a port
to my custom processor, is it considered ok to use the hardware method
if available?
Thanks,
Paul.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: implementing stepi
2005-04-29 13:03 implementing stepi Decker, Paul
@ 2005-04-29 15:15 ` Daniel Jacobowitz
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Jacobowitz @ 2005-04-29 15:15 UTC (permalink / raw)
To: Decker, Paul; +Cc: gdb
On Fri, Apr 29, 2005 at 08:49:28AM -0400, Decker, Paul wrote:
>
>
> hello everyone,
>
> I have what I believe is a simple question on the implementation of the
> stepi feature. Some processors provide a mechanism to step exactly one
> instruction, such as a special bit in a debug control register. While
> other processors don't provide this capability, and to implement a step,
> breakpoints must be sprinkled in various places, and a run (to the
> breakpoint) performed. Looking at some of the gdb source, it seems
> that stepi is implemented using the breakpoint method. In doing a port
> to my custom processor, is it considered ok to use the hardware method
> if available?
No, stepi is implemented in both ways depending on the features of the
target processor. This is why target_resume takes a "step" argument.
--
Daniel Jacobowitz
CodeSourcery, LLC
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