Hi Joe,
I know that pt_regs is like below. But I have to look where the stack is
allocated. [Taken from ptrace.h]
/* this struct defines the way the registers are stored on the
stack during a system call. */
struct pt_regs {
long ebx;
long ecx;
long edx;
long esi;
long edi;
long ebp;
long eax;
int xds;
int xes;
long orig_eax;
long eip;
int xcs;
long eflags;
long esp;
int xss;
};
rgds,
-Sup
% -----Original Message-----
% From: kernelnewbies-bounce@nl.linux.org
% [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Joseph A Knapka
% Sent: Wednesday, December 05, 2001 5:35 AM
% To: Anumula Venkat; kernelnewbies
% Subject: Re: runtimeimage of kernel module
%
%
% Anumula Venkat wrote:
% >
% > Can u please tell me where does the kernel stack lie.
% > And how to get access to it.
% >
% > Regards
% > Venkat
%
% I believe the kernel stack for a task is located on either
% the page above or the page below the task struct. Well, I
% used to believe that. After looking at do_fork() and
% sys_clone(), it appears the location of the new stack is
% actually being passed into sys_clone() in the pt_regs
% argument?!?!? That's very weird; the kernel has to allocate
% space for a new task's stack somewhere.
%
% In fact I notice all the sys_*() functions get a pt_regs
% argument; where does that come from, what does it mean?
% I'm not sufficiently clueful about gas assembler syntax
% to have any idea what the code in entry.S (system_call)
% is doing.
%
% Can anyone clarify how this works?
%
% Cheers,
%
% -- Joe
% --
% Kernelnewbies: Help each other learn about the Linux kernel.
% Archive: http://mail.nl.linux.org/kernelnewbies/
% IRC Channel: irc.openprojects.net / #kernelnewbies
% Web Page: http://www.kernelnewbies.org/
%
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