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/* Copyright (C) 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _ia64_rse_h
#define _ia64_rse_h
#include <features.h>
/* Register stack engine related helper functions. This file may be
used in applications, so be careful about the name-space and give
some consideration to non-GNU C compilers (though __inline is
fine). */
static __inline unsigned long
ia64_rse_slot_num (unsigned long *addr)
{
return (((unsigned long) addr) >> 3) & 0x3f;
}
/* Return TRUE if ADDR is the address of an RNAT slot. */
static __inline unsigned long
ia64_rse_is_rnat_slot (unsigned long *addr)
{
return ia64_rse_slot_num (addr) == 0x3f;
}
/* Returns the address of the RNAT slot that covers the slot at
address SLOT_ADDR. */
static __inline unsigned long *
ia64_rse_rnat_addr (unsigned long *slot_addr)
{
return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
}
/* Calcuate the number of registers in the dirty partition starting at
BSPSTORE with a size of DIRTY bytes. This isn't simply DIRTY
divided by eight because the 64th slot is used to store ar.rnat. */
static __inline unsigned long
ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
{
unsigned long slots = (bsp - bspstore);
return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
}
/* The inverse of the above: given bspstore and the number of
registers, calculate ar.bsp. */
static __inline unsigned long *
ia64_rse_skip_regs (unsigned long *addr, long num_regs)
{
long delta = ia64_rse_slot_num(addr) + num_regs;
if (num_regs < 0)
delta -= 0x3e;
return addr + num_regs + delta/0x3f;
}
#endif /* _ia64_rse_h */
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