Thanks for your response. Where can I get details about these registers? Any manuals/specifications available? I am interested to know, how many such kinds of registers are present and what does each register signify? Regards Mohanlal ----- Original Message ----- From: "Amit S. Kale" <amitkale@emsyssoft.com> To: "mohanlal jangir" <mohanlal@samsung.com>; "Linux Newbies" <kernelnewbies@nl.linux.org> Sent: Tuesday, March 30, 2004 3:38 PM Subject: Re: kdgb source query > 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/
