2001-12-04 03:43:48

by Aneesh Kumar KV

Subject: filling up pt_regs by myself

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

2001-12-04 20:38:00

by George Anzinger

Subject: Re: filling up pt_regs by myself

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 [email protected]
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