1  /* Copyright (C) 2001-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef _ia64_rse_h
      19  #define _ia64_rse_h
      20  
      21  #include <features.h>
      22  
      23  /* Register stack engine related helper functions.  This file may be
      24     used in applications, so be careful about the name-space and give
      25     some consideration to non-GNU C compilers (though __inline is
      26     fine). */
      27  
      28  static __inline unsigned long
      29  ia64_rse_slot_num (unsigned long *addr)
      30  {
      31  	return (((unsigned long) addr) >> 3) & 0x3f;
      32  }
      33  
      34  /* Return TRUE if ADDR is the address of an RNAT slot.  */
      35  
      36  static __inline unsigned long
      37  ia64_rse_is_rnat_slot (unsigned long *addr)
      38  {
      39  	return ia64_rse_slot_num (addr) == 0x3f;
      40  }
      41  
      42  /* Returns the address of the RNAT slot that covers the slot at
      43     address SLOT_ADDR.  */
      44  
      45  static __inline unsigned long *
      46  ia64_rse_rnat_addr (unsigned long *slot_addr)
      47  {
      48  	return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
      49  }
      50  
      51  /* Calculate the number of registers in the dirty partition starting at
      52     BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY
      53     divided by eight because the 64th slot is used to store ar.rnat.  */
      54  
      55  static __inline unsigned long
      56  ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
      57  {
      58  	unsigned long slots = (bsp - bspstore);
      59  
      60  	return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
      61  }
      62  
      63  /* The inverse of the above: given bspstore and the number of
      64     registers, calculate ar.bsp.  */
      65  
      66  static __inline unsigned long *
      67  ia64_rse_skip_regs (unsigned long *addr, long num_regs)
      68  {
      69  	long delta = ia64_rse_slot_num(addr) + num_regs;
      70  
      71  	if (num_regs < 0)
      72  		delta -= 0x3e;
      73  	return addr + num_regs + delta/0x3f;
      74  }
      75  
      76  #endif /* _ia64_rse_h */