summaryrefslogtreecommitdiff
path: root/gdb/m68kbsd-nat.c
blob: 954374b54f2389c77af01ae0c95d5b28d136c21e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/* Native-dependent code for Motorola 68000 BSD's.

   Copyright (C) 2004, 2007, 2008, 2009, 2010, 2011
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "gdbcore.h"
#include "inferior.h"
#include "regcache.h"

#include "gdb_assert.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>

#include "m68k-tdep.h"
#include "inf-ptrace.h"

static int
m68kbsd_gregset_supplies_p (int regnum)
{
  return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM);
}

static int
m68kbsd_fpregset_supplies_p (int regnum)
{
  return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM);
}

/* Supply the general-purpose registers stored in GREGS to REGCACHE.  */

static void
m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs)
{
  const char *regs = gregs;
  int regnum;

  for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++)
    regcache_raw_supply (regcache, regnum, regs + regnum * 4);
}

/* Supply the floating-point registers stored in FPREGS to REGCACHE.  */

static void
m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  const char *regs = fpregs;
  int regnum;

  for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++)
    regcache_raw_supply (regcache, regnum,
			 regs + m68kbsd_fpreg_offset (gdbarch, regnum));
}

/* Collect the general-purpose registers from REGCACHE and store them
   in GREGS.  */

static void
m68kbsd_collect_gregset (const struct regcache *regcache,
			 void *gregs, int regnum)
{
  char *regs = gregs;
  int i;

  for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
    {
      if (regnum == -1 || regnum == i)
	regcache_raw_collect (regcache, i, regs + i * 4);
    }
}

/* Collect the floating-point registers from REGCACHE and store them
   in FPREGS.  */

static void
m68kbsd_collect_fpregset (struct regcache *regcache,
			  void *fpregs, int regnum)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  char *regs = fpregs;
  int i;

  for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++)
    {
      if (regnum == -1 || regnum == i)
	regcache_raw_collect (regcache, i,
			      regs + m68kbsd_fpreg_offset (gdbarch, i));
    }
}


/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
   for all registers (including the floating-point registers).  */

static void
m68kbsd_fetch_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
	perror_with_name (_("Couldn't get registers"));

      m68kbsd_supply_gregset (regcache, &regs);
    }

  if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      m68kbsd_supply_fpregset (regcache, &fpregs);
    }
}

/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
   this for all registers (including the floating-point registers).  */

static void
m68kbsd_store_inferior_registers (struct target_ops *ops,
				  struct regcache *regcache, int regnum)
{
  if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum))
    {
      struct reg regs;

      if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
                  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
        perror_with_name (_("Couldn't get registers"));

      m68kbsd_collect_gregset (regcache, &regs, regnum);

      if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
	          (PTRACE_TYPE_ARG3) &regs, 0) == -1)
        perror_with_name (_("Couldn't write registers"));
    }

  if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum))
    {
      struct fpreg fpregs;

      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't get floating point status"));

      m68kbsd_collect_fpregset (regcache, &fpregs, regnum);

      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
	perror_with_name (_("Couldn't write floating point status"));
    }
}


/* Support for debugging kernel virtual memory images.  */

#include <sys/types.h>
#include <machine/pcb.h>

#include "bsd-kvm.h"

/* OpenBSD doesn't have these.  */
#ifndef PCB_REGS_FP
#define PCB_REGS_FP 10
#endif
#ifndef PCB_REGS_SP
#define PCB_REGS_SP 11
#endif

static int
m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
{
  int regnum, tmp;
  int i = 0;

  /* The following is true for NetBSD 1.6.2:

     The pcb contains %d2...%d7, %a2...%a7 and %ps.  This accounts for
     all callee-saved registers.  From this information we reconstruct
     the register state as it would look when we just returned from
     cpu_switch().  */

  /* The stack pointer shouldn't be zero.  */
  if (pcb->pcb_regs[PCB_REGS_SP] == 0)
    return 0;

  for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++)
    regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);
  for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++)
    regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]);

  tmp = pcb->pcb_ps & 0xffff;
  regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp);

  read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp);
  regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp);

  return 1;
}


/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_m68kbsd_nat (void);

void
_initialize_m68kbsd_nat (void)
{
  struct target_ops *t;

  t = inf_ptrace_target ();
  t->to_fetch_registers = m68kbsd_fetch_inferior_registers;
  t->to_store_registers = m68kbsd_store_inferior_registers;
  add_target (t);

  /* Support debugging kernel virtual memory images.  */
  bsd_kvm_add_target (m68kbsd_supply_pcb);
}