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glibc  2.9
rse.h
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00001 /* Copyright (C) 2001 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003      Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #ifndef _ia64_rse_h
00021 #define _ia64_rse_h
00022 
00023 #include <features.h>
00024 
00025 /* Register stack engine related helper functions.  This file may be
00026    used in applications, so be careful about the name-space and give
00027    some consideration to non-GNU C compilers (though __inline is
00028    fine). */
00029 
00030 static __inline unsigned long
00031 ia64_rse_slot_num (unsigned long *addr)
00032 {
00033        return (((unsigned long) addr) >> 3) & 0x3f;
00034 }
00035 
00036 /* Return TRUE if ADDR is the address of an RNAT slot.  */
00037 
00038 static __inline unsigned long
00039 ia64_rse_is_rnat_slot (unsigned long *addr)
00040 {
00041        return ia64_rse_slot_num (addr) == 0x3f;
00042 }
00043 
00044 /* Returns the address of the RNAT slot that covers the slot at
00045    address SLOT_ADDR.  */
00046 
00047 static __inline unsigned long *
00048 ia64_rse_rnat_addr (unsigned long *slot_addr)
00049 {
00050        return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
00051 }
00052 
00053 /* Calcuate the number of registers in the dirty partition starting at
00054    BSPSTORE with a size of DIRTY bytes.  This isn't simply DIRTY
00055    divided by eight because the 64th slot is used to store ar.rnat.  */
00056 
00057 static __inline unsigned long
00058 ia64_rse_num_regs (unsigned long *bspstore, unsigned long *bsp)
00059 {
00060        unsigned long slots = (bsp - bspstore);
00061 
00062        return slots - (ia64_rse_slot_num(bspstore) + slots)/0x40;
00063 }
00064 
00065 /* The inverse of the above: given bspstore and the number of
00066    registers, calculate ar.bsp.  */
00067 
00068 static __inline unsigned long *
00069 ia64_rse_skip_regs (unsigned long *addr, long num_regs)
00070 {
00071        long delta = ia64_rse_slot_num(addr) + num_regs;
00072 
00073        if (num_regs < 0)
00074               delta -= 0x3e;
00075        return addr + num_regs + delta/0x3f;
00076 }
00077 
00078 #endif /* _ia64_rse_h */