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Re: ptrace(2) interface for hardware watchpoints (breakpoints)



On 15.12.2016 19:45, Andrew Cagney wrote:
> 
> 
> On 15 December 2016 at 13:22, Eduardo Horvath <eeh%netbsd.org@localhost
> <mailto:eeh%netbsd.org@localhost>> wrote:
> 
> 
>     On Thu, 15 Dec 2016, Andrew Cagney wrote:
> 
>     > Might a better strategy be to first get the registers exposed, and then, if
>     > there's still time start to look at an abstract interface?
> 
>     That's one way of looking at it.
> 
>     Another way is to consider that watchpoints can be implemented through
>     careful use of the MMU.
> 
> 
> Yes, HP implemented something like this with wildebeast (gdb fork) on HP-UX.

Can it work for short data fields like shorts, integers? I know there
are features like mprotect(2) that perhaps could be used for the same
purpose... to some extend.


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