1/* Native-dependent code for PA-RISC HP-UX.
2
3   Copyright (C) 2004, 2005, 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 "inferior.h"
22#include "regcache.h"
23#include "target.h"
24
25#include "gdb_assert.h"
26#include <sys/ptrace.h>
27#include <machine/save_state.h>
28
29#ifdef HAVE_TTRACE
30#include <sys/ttrace.h>
31#endif
32
33#include "hppa-tdep.h"
34#include "inf-ptrace.h"
35#include "inf-ttrace.h"
36
37/* Non-zero if we should pretend not to be a runnable target.  */
38int child_suppress_run = 0;
39
40/* Return the offset of register REGNUM within `struct save_state'.
41   The offset returns depends on the flags in the "flags" register and
42   the register size (32-bit or 64-bit).  These are taken from
43   REGCACHE.  */
44
45LONGEST
46hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
47{
48  LONGEST offset;
49
50  if (regnum == HPPA_FLAGS_REGNUM)
51    return ssoff (ss_flags);
52
53  if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
54    {
55      struct gdbarch *arch = get_regcache_arch (regcache);
56      size_t size = register_size (arch, HPPA_R1_REGNUM);
57      ULONGEST flags;
58
59      gdb_assert (size == 4 || size == 8);
60
61      regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
62      if (flags & SS_WIDEREGS)
63	offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
64      else
65	offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
66    }
67  else
68    {
69      struct gdbarch *arch = get_regcache_arch (regcache);
70      size_t size = register_size (arch, HPPA_FP0_REGNUM);
71
72      gdb_assert (size == 4 || size == 8);
73      gdb_assert (regnum >= HPPA_FP0_REGNUM);
74      offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
75    }
76
77  gdb_assert (offset < sizeof (save_state_t));
78  return offset;
79}
80
81/* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
82   at all.  */
83#ifndef PTRACE_TYPE_RET
84#define PTRACE_TYPE_RET void
85#endif
86
87static void
88hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
89{
90  CORE_ADDR addr;
91  size_t size;
92  PTRACE_TYPE_RET *buf;
93  pid_t pid;
94  int i;
95
96  pid = ptid_get_pid (inferior_ptid);
97
98  /* This isn't really an address, but ptrace thinks of it as one.  */
99  addr = hppa_hpux_save_state_offset (regcache, regnum);
100  size = register_size (current_gdbarch, regnum);
101
102  gdb_assert (size == 4 || size == 8);
103  buf = alloca (size);
104
105#ifdef HAVE_TTRACE
106  {
107    lwpid_t lwp = ptid_get_lwp (inferior_ptid);
108
109    if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
110      error (_("Couldn't read register %s (#%d): %s"),
111	     gdbarch_register_name (current_gdbarch, regnum),
112	     regnum, safe_strerror (errno));
113  }
114#else
115  {
116    int i;
117
118    /* Read the register contents from the inferior a chuck at the time.  */
119    for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
120      {
121	errno = 0;
122	buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
123	if (errno != 0)
124	  error (_("Couldn't read register %s (#%d): %s"),
125		 gdbarch_register_name (current_gdbarch, regnum),
126		 regnum, safe_strerror (errno));
127
128	addr += sizeof (PTRACE_TYPE_RET);
129      }
130  }
131#endif
132
133  /* Take care with the "flags" register.  It's stored as an `int' in
134     `struct save_state', even for 64-bit code.  */
135  if (regnum == HPPA_FLAGS_REGNUM && size == 8)
136    {
137      ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 4);
138      store_unsigned_integer ((gdb_byte *)buf, 8, flags);
139    }
140
141  regcache_raw_supply (regcache, regnum, buf);
142}
143
144static void
145hppa_hpux_fetch_inferior_registers (struct regcache *regcache, int regnum)
146{
147  if (regnum == -1)
148    for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
149      hppa_hpux_fetch_register (regcache, regnum);
150  else
151    hppa_hpux_fetch_register (regcache, regnum);
152}
153
154/* Store register REGNUM into the inferior.  */
155
156static void
157hppa_hpux_store_register (struct regcache *regcache, int regnum)
158{
159  CORE_ADDR addr;
160  size_t size;
161  PTRACE_TYPE_RET *buf;
162  pid_t pid;
163
164  pid = ptid_get_pid (inferior_ptid);
165
166  /* This isn't really an address, but ptrace thinks of it as one.  */
167  addr = hppa_hpux_save_state_offset (regcache, regnum);
168  size = register_size (current_gdbarch, regnum);
169
170  gdb_assert (size == 4 || size == 8);
171  buf = alloca (size);
172
173  regcache_raw_collect (regcache, regnum, buf);
174
175  /* Take care with the "flags" register.  It's stored as an `int' in
176     `struct save_state', even for 64-bit code.  */
177  if (regnum == HPPA_FLAGS_REGNUM && size == 8)
178    {
179      ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 8);
180      store_unsigned_integer ((gdb_byte *)buf, 4, flags);
181      size = 4;
182    }
183
184#ifdef HAVE_TTRACE
185  {
186    lwpid_t lwp = ptid_get_lwp (inferior_ptid);
187
188    if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
189      error (_("Couldn't write register %s (#%d): %s"),
190	     gdbarch_register_name (current_gdbarch, regnum),
191	     regnum, safe_strerror (errno));
192  }
193#else
194  {
195    int i;
196
197    /* Write the register contents into the inferior a chunk at the time.  */
198    for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
199      {
200	errno = 0;
201	ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
202	if (errno != 0)
203	  error (_("Couldn't write register %s (#%d): %s"),
204		 gdbarch_register_name (current_gdbarch, regnum),
205		 regnum, safe_strerror (errno));
206
207	addr += sizeof (PTRACE_TYPE_RET);
208      }
209  }
210#endif
211}
212
213/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
214   this for all registers (including the floating point registers).  */
215
216static void
217hppa_hpux_store_inferior_registers (struct regcache *regcache, int regnum)
218{
219  if (regnum == -1)
220    for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
221      hppa_hpux_store_register (regcache, regnum);
222  else
223    hppa_hpux_store_register (regcache, regnum);
224}
225
226static int
227hppa_hpux_child_can_run (void)
228{
229  /* This variable is controlled by modules that layer their own
230     process structure atop that provided here.  The code in
231     hpux-thread.c does this to support the HP-UX user-mode DCE
232     threads.  */
233  return !child_suppress_run;
234}
235
236
237/* Prevent warning from -Wmissing-prototypes.  */
238void _initialize_hppa_hpux_nat (void);
239
240void
241_initialize_hppa_hpux_nat (void)
242{
243  struct target_ops *t;
244
245#ifdef HAVE_TTRACE
246  t = inf_ttrace_target ();
247#else
248  t = inf_ptrace_target ();
249#endif
250
251  t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
252  t->to_store_registers = hppa_hpux_store_inferior_registers;
253  t->to_can_run = hppa_hpux_child_can_run;
254
255  add_target (t);
256}
257