On Tuesday 30 Mar 2004 2:51 pm, mohanlal jangir wrote: > While looking in kgdb patch source, I found frequent use of registers db0, > db1... and dr6, dr7 etc in inline assembly code. Which are these registers? > I know registers eax, ebx etc but never heard of these. Are these same > registers? If yes, then what is mapping? > > Regards > Mohanlal These are debug registers in x86 architecture. They are used hardware debugging. This includes support for watchpoints. You can specify a data address for a watchpoint. The watchpoint will be triggered like a breakpoint whenever the data is modified. THis is useful if you want to know where a particular integer is modified in a huge program, for example. -- Amit Kale EmSysSoft (http://www.emsyssoft.com) KGDB: Linux Kernel Source Level Debugger (http://kgdb.sourceforge.net) -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
