You are right. __attribute__((regparm(3))) or fastcall works in my module. Thanks a lot. Zheng Da On Jan 3, 2008 11:26 AM, Greg Smith <gsmith@xxxxxxxxx> wrote: > As far as I know, arguments are passed to a function either in registers > or in the stack based on the prototype of the called function. See the > regparm __attribute__. My understanding is that this is also arch > dependent, for example s390x always passes arguments in registers (and > then the stack if there are too many). > > So your function calling the kernel function should be fine as long as > you have the correct function prototype. > > Greg Smith > > > On Thu, 2008-01-03 at 11:00 +0800, Zheng Da wrote: > > I'm writing a Linux kernel module which needs to call a static > > function in the kernel. > > Unfortunately, the static functions are compiled with arguments passed > > in registers. > > I don't want to change the kernel, so I have to use some trick to pass > > arguments in different ways. > > Currently, I use inline assembly, but I thought maybe GCC provides a better way. > > By the way, how does Linux kernel handle it? > > As I know, static functions pass their arguments in registers, and > > others in the stack. > > How does Linux kernel use them together? > > > > Zheng Da > > >
