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Date: Tue, 04 Dec 2001 12:08:03 -0800
From: george anzinger <george@mvista.com>
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To: "Aneesh Kumar K.V" <aneesh.kumar@digital.com>
CC: debian-alpha <debian-alpha@lists.debian.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: filling up pt_regs by  myself
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To the best of my knowledge there is NOT a standard way to pass the
pt_regs to a system call.  Each arch does its own thing.  Makes it REAL
hard to write a system call that needs them.  I hope we can define a
standard interface.

George

"Aneesh Kumar K.V" wrote:
> 
> Hi,
> 
>  Is there any functions that i can use to setup pt_regs structure
> myself.
> 
> For example how can I take a following  i386 system call  to alpha
> 
>  sys_mycall( struct pt_regs regs)
> {
>         my_function( &regs);
> 
> }
> 
> I tried to do it same way . But then the value of members of  regs
> structure  that i am  getting are corrupted. Later looking into the
> source i found that for most of  alpha  system call is defined something
> like
> 
>  sys_mycall( arg1, arg2, arg3.....)
> 
> So i replaced the above function definition with
> 
>  sys_mycall( argument1, argument 2 argument ) here consider  it takes
> only three arguments ...
> 
> But now how i will pass the regs structure to my_function . Is there any
> already existing function that help me to do that something like
> save_regs(&regs) ? Or do i need to hand code all the saving by itself.
> Can I use SAVE_ALL #define defined in entry.S .
> 
> Thanks in advance .
> 
>  -aneesh
> 
> 
> -
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-- 
George           george@mvista.com
High-res-timers: http://sourceforge.net/projects/high-res-timers/
Real time sched: http://sourceforge.net/projects/rtsched/
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