My purpose is to know which code reads value from a certain address. So I want to set a memory breakpoint and when cpu reads from the address, the breakpoint will be hit. But in the "Data breakpoint" in vc7, there are only two kinds of condition: "is true" and "has changed". How can I do?
5  2184 
lawrencelee wrote: My purpose is to know which code reads value from a certain address. So I want to set a memory breakpoint and when cpu reads from the address, the breakpoint will be hit. But in the "Data breakpoint" in vc7, there are only two kinds of condition: "is true" and "has changed". How can I do?
I would suggest to use no condition at all.
However, I did not know about data breakpoints and I have a question to
somebody who knows about how is this done on Intel processors.
Roman
Hi,
you need hardware breakpoints, but VC doesn't use them. With little effort
you can use them from ;you code, they impose no overhead on code execution.
See here http://www.morearty.com/code/breakpoint/.
Regards, Jan
"lawrencele e" <la*********@di scussions.micro soft.com> wrote in message
news:7E******** *************** ***********@mic rosoft.com... My purpose is to know which code reads value from a certain address. So I
want to set a memory breakpoint and when cpu reads from the address, the
breakpoint will be hit. But in the "Data breakpoint" in vc7, there are only
two kinds of condition: "is true" and "has changed". How can I do?
Actually the VS debugger's data breakpoints are done as hardware
breakpoints. Their used to be emulated data breakpoints as well but we
removed them altogether.
Ronald Laeremans
Visual C++ team
"Jan Bares" <ja*******@ante k.cz.no.spam> wrote in message
news:%2******** *******@TK2MSFT NGP12.phx.gbl.. . Hi,
you need hardware breakpoints, but VC doesn't use them. With little effort
you can use them from ;you code, they impose no overhead on code
execution.
See here http://www.morearty.com/code/breakpoint/.
Regards, Jan
"lawrencele e" <la*********@di scussions.micro soft.com> wrote in message
news:7E******** *************** ***********@mic rosoft.com... My purpose is to know which code reads value from a certain address. So I
want to set a memory breakpoint and when cpu reads from the address, the
breakpoint will be hit. But in the "Data breakpoint" in vc7, there are
only
two kinds of condition: "is true" and "has changed". How can I do?
Yes, I need hardware breakpoint. In other debuger, like windbg, gdb, it's very easy to set a hardware breakpoint. It's strange why vc can't do it distinctly.
So how can I set a "read" hardware breakpoint????
"Ronald Laeremans [MSFT]" wrote: Actually the VS debugger's data breakpoints are done as hardware
breakpoints. Their used to be emulated data breakpoints as well but we
removed them altogether.
Ronald Laeremans
Visual C++ team
"Jan Bares" <ja*******@ante k.cz.no.spam> wrote in message
news:%2******** *******@TK2MSFT NGP12.phx.gbl.. . Hi,
you need hardware breakpoints, but VC doesn't use them. With little effort
you can use them from ;you code, they impose no overhead on code
execution.
See here http://www.morearty.com/code/breakpoint/.
Regards, Jan
"lawrencele e" <la*********@di scussions.micro soft.com> wrote in message
news:7E******** *************** ***********@mic rosoft.com... My purpose is to know which code reads value from a certain address. So I
want to set a memory breakpoint and when cpu reads from the address, the
breakpoint will be hit. But in the "Data breakpoint" in vc7, there are
only
two kinds of condition: "is true" and "has changed". How can I do?
The VS debugger only supports HW write breakpoints, not read breakpoints. I
entered a suggestion in the bug database that we support read breakpoints as
well.
Ronald
"lawrencele e" <la*********@di scussions.micro soft.com> wrote in message
news:31******** *************** ***********@mic rosoft.com... Yes, I need hardware breakpoint. In other debuger, like windbg, gdb, it's
very easy to set a hardware breakpoint. It's strange why vc can't do it
distinctly.
So how can I set a "read" hardware breakpoint????
"Ronald Laeremans [MSFT]" wrote:
Actually the VS debugger's data breakpoints are done as hardware
breakpoints. Their used to be emulated data breakpoints as well but we
removed them altogether.
Ronald Laeremans
Visual C++ team
"Jan Bares" <ja*******@ante k.cz.no.spam> wrote in message
news:%2******** *******@TK2MSFT NGP12.phx.gbl.. . > Hi,
>
> you need hardware breakpoints, but VC doesn't use them. With little
> effort
> you can use them from ;you code, they impose no overhead on code
> execution.
> See here http://www.morearty.com/code/breakpoint/.
>
> Regards, Jan
>
>
> "lawrencele e" <la*********@di scussions.micro soft.com> wrote in message
> news:7E******** *************** ***********@mic rosoft.com...
>> My purpose is to know which code reads value from a certain address.
>> So I
> want to set a memory breakpoint and when cpu reads from the address,
> the
> breakpoint will be hit. But in the "Data breakpoint" in vc7, there are
> only
> two kinds of condition: "is true" and "has changed". How can I do?
>
>
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