1 /* Copyright (C) 2001-2022 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
ia64_rse_slot_num(unsigned long * addr)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
ia64_rse_is_rnat_slot(unsigned long * addr)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 *
ia64_rse_rnat_addr(unsigned long * slot_addr)46 ia64_rse_rnat_addr (unsigned long *slot_addr)
47 {
48 return (unsigned long *) ((unsigned long) slot_addr | (0x3f << 3));
49 }
50
51 /* Calcuate 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
ia64_rse_num_regs(unsigned long * bspstore,unsigned long * bsp)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 *
ia64_rse_skip_regs(unsigned long * addr,long num_regs)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 */
77