sysdeps/unix/sysv/linux/ia64/sys/rse.h

   1 /* Copyright (C) 2001-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3      Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _ia64_rse_h
  20 #define _ia64_rse_h
  21
  22 #include <features.h>
  23
  24 /* Register stack engine related helper functions.  This file may be
  25    used in applications, so be careful about the name-space and give
  26    some consideration to non-GNU C compilers (though __inline is
  27    fine). */
  28
  29 static __inline unsigned long
  30 ia64_rse_slot_num (unsigned long *addr)
  31 {
  32         return (((unsigned long) addr) >> 3) & 0x3f;
  33 }
  34
  35 /* Return TRUE if ADDR is the address of an RNAT slot.  */
  36
  37 static __inline unsigned long
  38 ia64_rse_is_rnat_slot (unsigned long *addr)
  39 {
  40         return ia64_rse_slot_num (addr) == 0x3f;
  41 }
  42
  43 /* Returns the address of the RNAT slot that covers the slot at
  44    address SLOT_ADDR.  */
  45
  46 static __inline unsigned long *
  47 ia64_rse_rnat_addr (unsigned long *slot_addr)
  48 {
  49         return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
  50 }
  51
  52 /* Calcuate the number of registers in the dirty partition starting at
  53    BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY
  54    divided by eight because the 64th slot is used to store ar.rnat.  */
  55
  56 static __inline unsigned long
  57 ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
  58 {
  59         unsigned long slots = (bsp - bspstore);
  60
  61         return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
  62 }
  63
  64 /* The inverse of the above: given bspstore and the number of
  65    registers, calculate ar.bsp.  */
  66
  67 static __inline unsigned long *
  68 ia64_rse_skip_regs (unsigned long *addr, long num_regs)
  69 {
  70         long delta = ia64_rse_slot_num(addr) + num_regs;
  71
  72         if (num_regs < 0)
  73                 delta -= 0x3e;
  74         return addr + num_regs + delta/0x3f;
  75 }
  76
  77 #endif /* _ia64_rse_h */