xref: /netbsd-src/external/gpl3/gdb/dist/gdb/alpha-linux-nat.c (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55)
1 /* Low level Alpha GNU/Linux interface, for GDB when running native.
2    Copyright (C) 2005-2014 Free Software Foundation, Inc.
3 
4    This file is part of GDB.
5 
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 3 of the License, or
9    (at your option) any later version.
10 
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
18 
19 #include "defs.h"
20 #include "target.h"
21 #include "regcache.h"
22 #include "linux-nat.h"
23 
24 #include "alpha-tdep.h"
25 
26 #include <sys/ptrace.h>
27 #include <alpha/ptrace.h>
28 
29 #include <sys/procfs.h>
30 #include "gregset.h"
31 
32 /* The address of UNIQUE for ptrace.  */
33 #define ALPHA_UNIQUE_PTRACE_ADDR 65
34 
35 
36 /* See the comment in m68k-tdep.c regarding the utility of these
37    functions.  */
38 
39 void
40 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
41 {
42   const long *regp = (const long *)gregsetp;
43 
44   /* PC is in slot 32, UNIQUE is in slot 33.  */
45   alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32);
46 }
47 
48 void
49 fill_gregset (const struct regcache *regcache,
50 	      gdb_gregset_t *gregsetp, int regno)
51 {
52   long *regp = (long *)gregsetp;
53 
54   /* PC is in slot 32, UNIQUE is in slot 33.  */
55   alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32);
56 }
57 
58 /* Now we do the same thing for floating-point registers.
59    Again, see the comments in m68k-tdep.c.  */
60 
61 void
62 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
63 {
64   const long *regp = (const long *)fpregsetp;
65 
66   /* FPCR is in slot 32.  */
67   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
68 }
69 
70 void
71 fill_fpregset (const struct regcache *regcache,
72 	       gdb_fpregset_t *fpregsetp, int regno)
73 {
74   long *regp = (long *)fpregsetp;
75 
76   /* FPCR is in slot 32.  */
77   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
78 }
79 
80 
81 static CORE_ADDR
82 alpha_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)
83 {
84   if (regno == gdbarch_pc_regnum (gdbarch))
85     return PC;
86   if (regno == ALPHA_UNIQUE_REGNUM)
87     return ALPHA_UNIQUE_PTRACE_ADDR;
88   if (regno < gdbarch_fp0_regnum (gdbarch))
89     return GPR_BASE + regno;
90   else
91     return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch);
92 }
93 
94 void _initialialize_alpha_linux_nat (void);
95 
96 void
97 _initialize_alpha_linux_nat (void)
98 {
99   linux_nat_add_target (linux_trad_target (alpha_linux_register_u_offset));
100 }
101