On Tue, 12 Oct 2004 15:07:55 -0400, Robert Love <rml@xxxxxxxxxx> wrote: > > > On Wed, 2004-10-13 at 03:32 +0900, aq wrote: > > > Anybody please tell me what is the meaning of orig_eax in > > user_regs_struct ? And what does it do, together with eax? > > > > In the same structure, there are somethings named _cs, _ds, _es, _ss, > > _bs, _fs. What do they do with these things? > > All of these are x86 registers. > > eax is the first register. old_eax is the value of eax before it was > mangled. > > cs, ds, es, fs, gs, ss are segment registers. They are used as segment > selectors, pointing into the global descriptor table. But Linux does > not use segments (for the most part) so we use them for other purposes. > I suppose that Linux still uses some segment registers, since there are macros such as get_ds() and set_ds(). Is that correct? Many thanks, AQ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
