1/* Native-dependent code for OpenBSD/hppa.
2
3   Copyright (C) 2004-2020 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 "inferior.h"
22#include "regcache.h"
23#include "target.h"
24
25#include <sys/types.h>
26#include <sys/ptrace.h>
27#include <machine/reg.h>
28
29#include "hppa-tdep.h"
30#include "inf-ptrace.h"
31
32#include "obsd-nat.h"
33
34struct hppa_obsd_nat_target final : public obsd_nat_target
35{
36  void fetch_registers (struct regcache *, int) override;
37  void store_registers (struct regcache *, int) override;
38};
39
40static hppa_obsd_nat_target the_hppa_obsd_nat_target;
41
42static int
43hppaobsd_gregset_supplies_p (int regnum)
44{
45  return (regnum >= HPPA_R0_REGNUM && regnum <= HPPA_CR27_REGNUM);
46}
47
48static int
49hppaobsd_fpregset_supplies_p (int regnum)
50{
51  return (regnum >= HPPA_FP0_REGNUM && regnum <= HPPA_FP31R_REGNUM);
52}
53
54/* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
55
56static void
57hppaobsd_supply_gregset (struct regcache *regcache, const void *gregs)
58{
59  gdb_byte zero[4] = { 0 };
60  const char *regs = gregs;
61  int regnum;
62
63  regcache->raw_supply (HPPA_R0_REGNUM, &zero);
64  for (regnum = HPPA_R1_REGNUM; regnum <= HPPA_R31_REGNUM; regnum++)
65    regcache->raw_supply (regnum, regs + regnum * 4);
66
67  if (sizeof(struct reg) >= 46 * 4)
68    {
69      regcache->raw_supply (HPPA_IPSW_REGNUM, regs);
70      regcache->raw_supply (HPPA_SAR_REGNUM, regs + 32 * 4);
71      regcache->raw_supply (HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
72      regcache->raw_supply (HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
73      regcache->raw_supply (HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
74      regcache->raw_supply (HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
75      regcache->raw_supply (HPPA_SR0_REGNUM, regs + 37 * 4);
76      regcache->raw_supply (HPPA_SR1_REGNUM, regs + 38 * 4);
77      regcache->raw_supply (HPPA_SR2_REGNUM, regs + 39 * 4);
78      regcache->raw_supply (HPPA_SR3_REGNUM, regs + 40 * 4);
79      regcache->raw_supply (HPPA_SR4_REGNUM, regs + 41 * 4);
80      regcache->raw_supply (HPPA_SR5_REGNUM, regs + 42 * 4);
81      regcache->raw_supply (HPPA_SR6_REGNUM, regs + 43 * 4);
82      regcache->raw_supply (HPPA_SR7_REGNUM, regs + 44 * 4);
83      regcache->raw_supply (HPPA_CR26_REGNUM, regs + 45 * 4);
84      regcache->raw_supply (HPPA_CR27_REGNUM, regs + 46 * 4);
85    }
86  else
87    {
88      regcache->raw_supply (HPPA_SAR_REGNUM, regs);
89      regcache->raw_supply (HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
90      regcache->raw_supply (HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
91    }
92}
93
94/* Supply the floating-point registers stored in FPREGS to REGCACHE.  */
95
96static void
97hppaobsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
98{
99  const char *regs = fpregs;
100  int regnum;
101
102  for (regnum = HPPA_FP0_REGNUM; regnum <= HPPA_FP31R_REGNUM;
103       regnum += 2, regs += 8)
104    {
105      regcache->raw_supply (regnum, regs);
106      regcache->raw_supply (regnum + 1, regs + 4);
107    }
108}
109
110/* Collect the general-purpose registers from REGCACHE and store them
111   in GREGS.  */
112
113static void
114hppaobsd_collect_gregset (const struct regcache *regcache,
115			  void *gregs, int regnum)
116{
117  char *regs = gregs;
118  int i;
119
120  for (i = HPPA_R1_REGNUM; i <= HPPA_R31_REGNUM; i++)
121    {
122      if (regnum == -1 || regnum == i)
123	regcache->raw_collect (i, regs + i * 4);
124    }
125
126  if (sizeof(struct reg) >= 46 * 4)
127    {
128      if (regnum == -1 || regnum == HPPA_IPSW_REGNUM)
129	regcache->raw_collect (HPPA_IPSW_REGNUM, regs);
130      if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
131	regcache->raw_collect (HPPA_SAR_REGNUM, regs + 32 * 4);
132      if (regnum == -1 || regnum == HPPA_PCSQ_HEAD_REGNUM)
133	regcache->raw_collect (HPPA_PCSQ_HEAD_REGNUM, regs + 33 * 4);
134      if (regnum == -1 || regnum == HPPA_PCSQ_TAIL_REGNUM)
135	regcache->raw_collect (HPPA_PCSQ_TAIL_REGNUM, regs + 34 * 4);
136      if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
137	regcache->raw_collect (HPPA_PCOQ_HEAD_REGNUM, regs + 35 * 4);
138      if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
139	regcache->raw_collect (HPPA_PCOQ_TAIL_REGNUM, regs + 36 * 4);
140      if (regnum == -1 || regnum == HPPA_SR0_REGNUM)
141	regcache->raw_collect (HPPA_SR0_REGNUM, regs + 37 * 4);
142      if (regnum == -1 || regnum == HPPA_SR1_REGNUM)
143	regcache->raw_collect (HPPA_SR1_REGNUM, regs + 38 * 4);
144      if (regnum == -1 || regnum == HPPA_SR2_REGNUM)
145	regcache->raw_collect (HPPA_SR2_REGNUM, regs + 39 * 4);
146      if (regnum == -1 || regnum == HPPA_SR3_REGNUM)
147	regcache->raw_collect (HPPA_SR3_REGNUM, regs + 40 * 4);
148      if (regnum == -1 || regnum == HPPA_SR4_REGNUM)
149	regcache->raw_collect (HPPA_SR4_REGNUM, regs + 41 * 4);
150      if (regnum == -1 || regnum == HPPA_SR5_REGNUM)
151	regcache->raw_collect (HPPA_SR5_REGNUM, regs + 42 * 4);
152      if (regnum == -1 || regnum == HPPA_SR6_REGNUM)
153	regcache->raw_collect (HPPA_SR6_REGNUM, regs + 43 * 4);
154      if (regnum == -1 || regnum == HPPA_SR7_REGNUM)
155	regcache->raw_collect (HPPA_SR7_REGNUM, regs + 44 * 4);
156      if (regnum == -1 || regnum == HPPA_CR26_REGNUM)
157	regcache->raw_collect (HPPA_CR26_REGNUM, regs + 45 * 4);
158      if (regnum == -1 || regnum == HPPA_CR27_REGNUM)
159	regcache->raw_collect (HPPA_CR27_REGNUM, regs + 46 * 4);
160    }
161  else
162    {
163      if (regnum == -1 || regnum == HPPA_SAR_REGNUM)
164	regcache->raw_collect (HPPA_SAR_REGNUM, regs);
165      if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM)
166	regcache->raw_collect (HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4);
167      if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM)
168	regcache->raw_collect (HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4);
169    }
170}
171
172/* Collect the floating-point registers from REGCACHE and store them
173   in FPREGS.  */
174
175static void
176hppaobsd_collect_fpregset (struct regcache *regcache,
177			   void *fpregs, int regnum)
178{
179  char *regs = fpregs;
180  int i;
181
182  for (i = HPPA_FP0_REGNUM; i <= HPPA_FP31R_REGNUM; i += 2, regs += 8)
183    {
184      if (regnum == -1 || regnum == i || regnum == i + 1)
185	{
186	  regcache->raw_collect (i, regs);
187	  regcache->raw_collect (i + 1, regs + 4);
188	}
189    }
190}
191
192
193/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
194   for all registers (including the floating-point registers).  */
195
196void
197hppa_obsd_nat_target::fetch_registers (struct regcache *regcache, int regnum)
198{
199  pid_t pid = regcache->ptid ().pid ();
200
201  if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
202    {
203      struct reg regs;
204
205      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
206	perror_with_name (_("Couldn't get registers"));
207
208      hppaobsd_supply_gregset (regcache, &regs);
209    }
210
211  if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
212    {
213      struct fpreg fpregs;
214
215      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
216	perror_with_name (_("Couldn't get floating point status"));
217
218      hppaobsd_supply_fpregset (regcache, &fpregs);
219    }
220}
221
222/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
223   this for all registers (including the floating-point registers).  */
224
225void
226hppa_obsd_nat_target::store_registers (struct regcache *regcache, int regnum)
227{
228  if (regnum == -1 || hppaobsd_gregset_supplies_p (regnum))
229    {
230      struct reg regs;
231
232      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
233        perror_with_name (_("Couldn't get registers"));
234
235      hppaobsd_collect_gregset (regcache, &regs, regnum);
236
237      if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
238        perror_with_name (_("Couldn't write registers"));
239    }
240
241  if (regnum == -1 || hppaobsd_fpregset_supplies_p (regnum))
242    {
243      struct fpreg fpregs;
244
245      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
246	perror_with_name (_("Couldn't get floating point status"));
247
248      hppaobsd_collect_fpregset (regcache, &fpregs, regnum);
249
250      if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
251	perror_with_name (_("Couldn't write floating point status"));
252    }
253}
254
255void _initialize_hppaobsd_nat ();
256void
257_initialize_hppaobsd_nat ()
258{
259  add_inf_child_target (&the_hppa_obsd_nat_target);
260}
261