Hi: He simply means that at max syscalls on Intel platform can have 5 args. However as in 2.6.0-test2 syscalls can have 6 args. See asm/unistd.h for details. -Manu > ---------- > From: kernelnewbies-bounce@nl.linux.org[SMTP:kernelnewbies-bounce@nl.linux.org] on behalf of Mandeep Singh Sandhu[SMTP:mandeep_sandhu@infosys.com] > Sent: Thursday, December 11, 2003 10:34 AM > To: kernelnewbies@nl.linux.org > Subject: syscall doubt > > Hi all, > > I was going thru an article in "Kernel Korner - Implementation of System Calls". > There the author had mentioned something like the syscall can have only 5 arguments > on intel platforms. The exact excerpt is as follows.. > > "........each call is associated with one number. This number is passed in the %eax > processor register indicating the number of arguments, and each argument of the system > call (a function) is passed in %ebx, %ecx, %edx, %esi or %edi--up to five arguments on > Intel platforms. The macro definitions corresponding to each _syscallN, depending on the > value of N, can be found in unistd.h." > > > Can NE one explain the above para?? > what does he mean when he says "...each argument of the system call (a function)" > Does he mean each arg of the sys call is a function pointer??? > > THANX > mandeep > > > -----Original Message----- > From: Greg KH [mailto:greg@kroah.com] > Sent: Wednesday, December 10, 2003 8:49 PM > To: Vanitha Ramaswami > Cc: 'kernelnewbies@nl.linux.org' > Subject: Re: Sharing a global variable between a user space application > and a Kernel module > > > On Wed, Dec 10, 2003 at 03:02:10PM +0800, Vanitha Ramaswami wrote: > > Hello, > > > > How do i access a global variable defined in a user space application > > from a kernel module.? > > Short answer: > You can't. > > Long answer: > you must write code to be able to export/import that variable > through some means (proc, sysfs, sysctl, etc.) > > > greg k-h > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
