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

   1 /* Copyright (C) 2001 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _ia64_rse_h
  21 #define _ia64_rse_h
  22
  23 #include <features.h>
  24
  25 /* Register stack engine related helper functions.  This file may be
  26    used in applications, so be careful about the name-space and give
  27    some consideration to non-GNU C compilers (though __inline is
  28    fine). */
  29
  30 static __inline unsigned long
  31 ia64_rse_slot_num (unsigned long *addr)
  32 {
  33         return (((unsigned long) addr) >> 3) & 0x3f;
  34 }
  35
  36 /* Return TRUE if ADDR is the address of an RNAT slot.  */
  37
  38 static __inline unsigned long
  39 ia64_rse_is_rnat_slot (unsigned long *addr)
  40 {
  41         return ia64_rse_slot_num (addr) == 0x3f;
  42 }
  43
  44 /* Returns the address of the RNAT slot that covers the slot at
  45    address SLOT_ADDR.  */
  46
  47 static __inline unsigned long *
  48 ia64_rse_rnat_addr (unsigned long *slot_addr)
  49 {
  50         return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
  51 }
  52
  53 /* Calcuate the number of registers in the dirty partition starting at
  54    BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY
  55    divided by eight because the 64th slot is used to store ar.rnat.  */
  56
  57 static __inline unsigned long
  58 ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
  59 {
  60         unsigned long slots = (bsp - bspstore);
  61
  62         return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
  63 }
  64
  65 /* The inverse of the above: given bspstore and the number of
  66    registers, calculate ar.bsp.  */
  67
  68 static __inline unsigned long *
  69 ia64_rse_skip_regs (unsigned long *addr, long num_regs)
  70 {
  71         long delta = ia64_rse_slot_num(addr) + num_regs;
  72
  73         if (num_regs < 0)
  74                 delta -= 0x3e;
  75         return addr + num_regs + delta/0x3f;
  76 }
  77
  78 #endif /* _ia64_rse_h */