Re: [PATCH] compatibility syscall layer (lets try again)

Linus Torvalds (torvalds@transmeta.com)
Wed, 4 Dec 2002 12:07:11 -0800 (PST)


On Wed, 4 Dec 2002, george anzinger wrote:
>
> As a suggestion for a solution for this, is it true that
> regs, on a system call, will ALWAYS be at the end of the
> stack?

No. Some architectures do not save enough state on the stack by default,
and need to do more to use do_signal(). Look at alpha, for example - the
default kernel stack doesn't contain all tbe registers needed, and
the alpha do_signal() calling convention is different.

If you want to handle do_signal(), then you need to do _all_ of this in
architecture-specific files. You simply cannot do what you want to do in a
generic way.

Linus

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