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78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/* Copyright (C) 2001-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _ia64_rse_h
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#define _ia64_rse_h
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#include <features.h>
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/* Register stack engine related helper functions. This file may be
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used in applications, so be careful about the name-space and give
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some consideration to non-GNU C compilers (though __inline is
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fine). */
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static __inline unsigned long
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ia64_rse_slot_num (unsigned long *addr)
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{
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return (((unsigned long) addr) >> 3) & 0x3f;
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}
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/* Return TRUE if ADDR is the address of an RNAT slot. */
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static __inline unsigned long
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ia64_rse_is_rnat_slot (unsigned long *addr)
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{
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return ia64_rse_slot_num (addr) == 0x3f;
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}
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/* Returns the address of the RNAT slot that covers the slot at
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address SLOT_ADDR. */
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static __inline unsigned long *
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ia64_rse_rnat_addr (unsigned long *slot_addr)
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{
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return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
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}
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/* Calcuate the number of registers in the dirty partition starting at
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BSPSTORE with a size of DIRTY bytes. This isn't simply DIRTY
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divided by eight because the 64th slot is used to store ar.rnat. */
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static __inline unsigned long
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ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
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{
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unsigned long slots = (bsp - bspstore);
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return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
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}
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/* The inverse of the above: given bspstore and the number of
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registers, calculate ar.bsp. */
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static __inline unsigned long *
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ia64_rse_skip_regs (unsigned long *addr, long num_regs)
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{
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long delta = ia64_rse_slot_num(addr) + num_regs;
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if (num_regs < 0)
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delta -= 0x3e;
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return addr + num_regs + delta/0x3f;
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}
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#endif /* _ia64_rse_h */
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