Re: Syscall changes registers beyond %eax, on linux-i386

From: Richard B. Johnson (
Date: Thu Sep 19 2002 - 14:18:02 EST

On Thu, 19 Sep 2002, Brian Gerst wrote:

> Richard Henderson wrote:
> > On Thu, Sep 19, 2002 at 02:04:43PM -0400, Brian Gerst wrote:
> >
> >>Now that I've thought about it more, I think the best solution is to go
> >>through all the syscalls (a big job, I know), and declare the parameters
> >>as const, so that gcc knows it can't modify them, and will throw a
> >>warning if we try.
> >
> >
> > The parameter area belongs to the callee, and it may *always* be modified.
> >
> >
> > r~
> >
> The parameters can not be modified if they are declared const though,
> that's my point.

Yes. A temporary declaration change to compile the kernel and
see where it complains.

Dick Johnson
Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
The US military has given us many words, FUBAR, SNAFU, now ENRON.
Yes, top management were graduates of West Point and Annapolis.

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