This is the mail archive of the libc-hacker@sources.redhat.com mailing list for the glibc project.

Note that libc-hacker is a closed list. You may look at the archives of this list, but subscription and posting are not open.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: makecontext and its arguments

On Mon, Aug 05, 2002 at 10:15:06PM +0200, Andreas Schwab wrote:
> Ulrich Drepper <drepper@redhat.com> writes:
> 
> |> Andreas Jaeger wrote:
> |> > That interpretation of long causes problems for x86-64 since ints are
> |> > not sign extented when passed in varargs...
> |> 
> |> How about fixing this mistake in the compiler with a function attribute?
> 
> ???  There is no way to find out the right type in va_arg.  Either the
> types match, or you get undefined behaviour.  If you pass an int and
> retrieve it as a long all bets are off.

Adding __attribute__((sane_x86_64_varargs)) to makecontext and make gcc
promote all varargs into DImode when calling vararg functions with
this attribute?

	Jakub
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]