Access user stack in kernel mode

[Anant Narayanan <anant@xxxxxx>]

Hi,

I have a program that invokes system calls in a manner different from  
what Linux expects. The arguments for the system call are stored on  
the user-stack (just like arguments for a normal function call), not  
on the registers. After the system call is invoked (through an  
interrupt, not 0x80, but a different number) - what must I do in my  
interrupt handler to access the arguments that were put on the user  
stack?

As I understand, the moment an interrupt is invoked, we are in kernel- 
mode. There are a few macros like __get_user_X that can be used to  
copy data from user-space, but how do I find the addresses of the  
arguments on the stack? Note that the initial code for the interrupt  
handler has to be assembly.

Thanks in advance.

Cheers,
Anant


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