1/* Native-dependent code for NetBSD/sparc64.
2
3   Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
4
5   This file is part of GDB.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
20#include "defs.h"
21#include "gdbcore.h"
22#include "regcache.h"
23#include "target.h"
24
25#include "sparc64-tdep.h"
26#include "sparc-nat.h"
27
28/* NetBSD is different from the other OSes that support both SPARC and
29   UltraSPARC in that the result of ptrace(2) depends on whether the
30   traced process is 32-bit or 64-bit.  */
31
32static void
33sparc64nbsd_supply_gregset (const struct sparc_gregset *gregset,
34			    struct regcache *regcache,
35			    int regnum, const void *gregs)
36{
37  int sparc32 = (gdbarch_ptr_bit (current_gdbarch) == 32);
38
39  if (sparc32)
40    sparc32_supply_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
41  else
42    sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
43}
44
45static void
46sparc64nbsd_collect_gregset (const struct sparc_gregset *gregset,
47			     const struct regcache *regcache,
48			     int regnum, void *gregs)
49{
50  int sparc32 = (gdbarch_ptr_bit (current_gdbarch) == 32);
51
52  if (sparc32)
53    sparc32_collect_gregset (&sparc32nbsd_gregset, regcache, regnum, gregs);
54  else
55    sparc64_collect_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
56}
57
58static void
59sparc64nbsd_supply_fpregset (struct regcache *regcache,
60			     int regnum, const void *fpregs)
61{
62  int sparc32 = (gdbarch_ptr_bit (current_gdbarch) == 32);
63
64  if (sparc32)
65    sparc32_supply_fpregset (regcache, regnum, fpregs);
66  else
67    sparc64_supply_fpregset (regcache, regnum, fpregs);
68}
69
70static void
71sparc64nbsd_collect_fpregset (const struct regcache *regcache,
72			      int regnum, void *fpregs)
73{
74  int sparc32 = (gdbarch_ptr_bit (current_gdbarch) == 32);
75
76  if (sparc32)
77    sparc32_collect_fpregset (regcache, regnum, fpregs);
78  else
79    sparc64_collect_fpregset (regcache, regnum, fpregs);
80}
81
82/* Determine whether `gregset_t' contains register REGNUM.  */
83
84static int
85sparc64nbsd_gregset_supplies_p (int regnum)
86{
87  if (gdbarch_ptr_bit (current_gdbarch) == 32)
88    return sparc32_gregset_supplies_p (regnum);
89
90  /* Integer registers.  */
91  if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
92      || (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
93      || (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
94      || (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
95    return 1;
96
97  /* Control registers.  */
98  if (regnum == SPARC64_PC_REGNUM
99      || regnum == SPARC64_NPC_REGNUM
100      || regnum == SPARC64_STATE_REGNUM
101      || regnum == SPARC64_Y_REGNUM)
102    return 1;
103
104  return 0;
105}
106
107/* Determine whether `fpregset_t' contains register REGNUM.  */
108
109static int
110sparc64nbsd_fpregset_supplies_p (int regnum)
111{
112  if (gdbarch_ptr_bit (current_gdbarch) == 32)
113    return sparc32_fpregset_supplies_p (regnum);
114
115  /* Floating-point registers.  */
116  if ((regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
117      || (regnum >= SPARC64_F32_REGNUM && regnum <= SPARC64_F62_REGNUM))
118    return 1;
119
120  /* Control registers.  */
121  if (regnum == SPARC64_FSR_REGNUM)
122    return 1;
123
124  return 0;
125}
126
127
128/* Support for debugging kernel virtual memory images.  */
129
130#include <sys/types.h>
131#include <machine/pcb.h>
132
133#include "bsd-kvm.h"
134
135static int
136sparc64nbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
137{
138  u_int64_t state;
139  int regnum;
140
141  /* The following is true for NetBSD 1.6.2:
142
143     The pcb contains %sp and %pc, %psr and %wim.  From this information
144     we reconstruct the register state as it would look when we just
145     returned from cpu_switch().  */
146
147  /* The stack pointer shouldn't be zero.  */
148  if (pcb->pcb_sp == 0)
149    return 0;
150
151  /* If the program counter is zero, this is probably a core dump, and
152     we can get %pc from the stack.  */
153  if (pcb->pcb_pc == 0)
154      read_memory(pcb->pcb_sp + BIAS - 176 + (11 * 8),
155		  (gdb_byte *)&pcb->pcb_pc, sizeof pcb->pcb_pc);
156
157
158  regcache_raw_supply (regcache, SPARC_SP_REGNUM, &pcb->pcb_sp);
159  regcache_raw_supply (regcache, SPARC64_PC_REGNUM, &pcb->pcb_pc);
160
161  state = pcb->pcb_pstate << 8 | pcb->pcb_cwp;
162  regcache_raw_supply (regcache, SPARC64_STATE_REGNUM, &state);
163
164  sparc_supply_rwindow (regcache, pcb->pcb_sp, -1);
165
166  return 1;
167}
168
169
170/* Provide a prototype to silence -Wmissing-prototypes.  */
171void _initialize_sparc64nbsd_nat (void);
172
173void
174_initialize_sparc64nbsd_nat (void)
175{
176  sparc_supply_gregset = sparc64nbsd_supply_gregset;
177  sparc_collect_gregset = sparc64nbsd_collect_gregset;
178  sparc_supply_fpregset = sparc64nbsd_supply_fpregset;
179  sparc_collect_fpregset = sparc64nbsd_collect_fpregset;
180  sparc_gregset_supplies_p = sparc64nbsd_gregset_supplies_p;
181  sparc_fpregset_supplies_p = sparc64nbsd_fpregset_supplies_p;
182
183  /* We've got nothing to add to the generic SPARC target.  */
184  add_target (sparc_target ());
185
186  /* Support debugging kernel virtual memory images.  */
187  bsd_kvm_add_target (sparc64nbsd_supply_pcb);
188}
189