On Thu, Jan 03, 2002 at 10:11:20AM -0700, [EMAIL PROTECTED] wrote:
> > Not just ia64, powerpc 64 as well. You are assuming that all pointers
> > are the same format when that is not guaranteed by the C standard. On
> > most architectures they are the same, you can convert a function
> > pointer to a void pointer and back again but it is not defined
> > behaviour.
> >
> > On IA64 and PPC64 the function pointer does not reference the function
> > itself, instead it points to a function descriptor. The function
> > descriptor contains a pointer to the function code plus additional data
> > such as a pointer to the global data to be used when the function is
> > called. This is mandated by the architecture software ABI.
Yea, I found the ABI at:
http://developer.intel.com/design/itanium/downloads/24537003.pdf
It seems to be newer than the IA-64 Architecture Software Developer's Manual Volumes.
> Also true for HPPA targets.
I recall some of the NUMA kgdb developers going to work on the ia64 project.
A number of concepts of pa-64, like stack unwinding, come from the HP precision
architecture. I was wondering if their gdb work was used on the ia64 simulator.
Sun's Eagle simulator is running in a modified version of gdb.
So my problem was caused by the function descriptor not being visible
when I printed the pointer to the function with gdb. Why isn't gdb being
fixed so that the function descriptor is visible?
I suppose for now I'll create a function descriptor structure and cast
the function pointer to it. It seems like something that gdb should do
automatically for ia64 applications.
-piet
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