How GDB knows a breakpoint is hit?

[kceiwH]

Thanks very much.

Mao

On Aug 19, 2009, at 5:09 PM, Andreas Schwab wrote:

> kceiwH <kceiwh@gmail.com> writes:
>
>> I wonder how GDB knows it should stop the inferior when a  
>> breakpoint is
>> hit. I try to read the code but only to find how GDB creates a
>> breakpoint. I thought GDB might change some instructions of  
>> inferior  so
>> that when the inferior executes the modified instructions, GDB   
>> should
>> know. But what the function "create_breakpoint" does is to add  a
>> breakpoint to the list "breakpoint_chain".
>
> Breakpoints are only inserted immediately before the inferior is
> resumed, see insert_breakpoints.
>
> Andreas.
>
> -- 
> Andreas Schwab, schwab@linux-m68k.org
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