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From: "Gerrit van Niekerk" <gerritvn AT gpvno DOT co DOT za>
Organization: GPvNO
To: djgpp AT delorie DOT com
Date: Mon, 28 Jan 2008 09:49:32 +0200
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Subject: GDB h/w support
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Reply-To: djgpp AT delorie DOT com

Can anybody tell me in what module the low level GDB hardware support 
for DJGPP is implemented? I am talking about writing and reading the 
i386 debug registers. I have searched both the GDB and the DJGPP 
source code and just can't find it.

The reason I want to know, is to implement h/w watchpoint support in 
a DJGPP GDB stub.

BTW: I found and fixed a number of problems in gdbst01 (which does 
not work at all on current GDB versions) and got it working nicely 
using a TCP/IP connection between the DJGPP target and a specially 
configured Cygwin GDB on WinXP. The DJGPP target uses a proprietary 
TCP/IP product (Datalight Sockets). 

I would like to make the modified stub available to the DJGPP 
community for serial port use or TCP/IP use for Datalight customers. 
Perhaps someone can port it to an open source TCP/IP implementation. 
Thoughts?