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List:       gdb
Subject:    Re: implementing stepi
From:       Daniel Jacobowitz <drow () false ! org>
Date:       2005-04-29 13:03:06
Message-ID: 20050429130305.GA19766 () nevyn ! them ! org
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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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