aboutsummaryrefslogtreecommitdiff
path: root/gdbserver/linux-sh-low.cc
blob: d47cd402def1f4c71e586f0d3cdcd479400d515f (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
/* GNU/Linux/SH specific low level interface, for the remote server for GDB.
   Copyright (C) 1995-2020 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 "server.h"
#include "linux-low.h"

/* Linux target op definitions for the SH architecture.  */

class sh_target : public linux_process_target
{
public:

  const regs_info *get_regs_info () override;

protected:

  void low_arch_setup () override;
};

/* The singleton target ops object.  */

static sh_target the_sh_target;

/* Defined in auto-generated file reg-sh.c.  */
void init_registers_sh (void);
extern const struct target_desc *tdesc_sh;

#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif

#include <asm/ptrace.h>

#define sh_num_regs 41

/* Currently, don't check/send MQ.  */
static int sh_regmap[] = {
 0,	4,	8,	12,	16,	20,	24,	28,
 32,	36,	40,	44,	48,	52,	56,	60,

 REG_PC*4,   REG_PR*4,   REG_GBR*4,  -1,
 REG_MACH*4, REG_MACL*4, REG_SR*4,
 REG_FPUL*4, REG_FPSCR*4,

 REG_FPREG0*4+0,   REG_FPREG0*4+4,   REG_FPREG0*4+8,   REG_FPREG0*4+12,
 REG_FPREG0*4+16,  REG_FPREG0*4+20,  REG_FPREG0*4+24,  REG_FPREG0*4+28,
 REG_FPREG0*4+32,  REG_FPREG0*4+36,  REG_FPREG0*4+40,  REG_FPREG0*4+44,
 REG_FPREG0*4+48,  REG_FPREG0*4+52,  REG_FPREG0*4+56,  REG_FPREG0*4+60,
};

static int
sh_cannot_store_register (int regno)
{
  return 0;
}

static int
sh_cannot_fetch_register (int regno)
{
  return 0;
}

/* Correct in either endianness, obviously.  */
static const unsigned short sh_breakpoint = 0xc3c3;
#define sh_breakpoint_len 2

/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */

static const gdb_byte *
sh_sw_breakpoint_from_kind (int kind, int *size)
{
  *size = sh_breakpoint_len;
  return (const gdb_byte *) &sh_breakpoint;
}

static int
sh_breakpoint_at (CORE_ADDR where)
{
  unsigned short insn;

  the_target->read_memory (where, (unsigned char *) &insn, 2);
  if (insn == sh_breakpoint)
    return 1;

  /* If necessary, recognize more trap instructions here.  GDB only uses the
     one.  */
  return 0;
}

/* Support for hardware single step.  */

static int
sh_supports_hardware_single_step (void)
{
  return 1;
}

/* Provide only a fill function for the general register set.  ps_lgetregs
   will use this for NPTL support.  */

static void sh_fill_gregset (struct regcache *regcache, void *buf)
{
  int i;

  for (i = 0; i < 23; i++)
    if (sh_regmap[i] != -1)
      collect_register (regcache, i, (char *) buf + sh_regmap[i]);
}

static struct regset_info sh_regsets[] = {
  { 0, 0, 0, 0, GENERAL_REGS, sh_fill_gregset, NULL },
  NULL_REGSET
};

static struct regsets_info sh_regsets_info =
  {
    sh_regsets, /* regsets */
    0, /* num_regsets */
    NULL, /* disabled_regsets */
  };

static struct usrregs_info sh_usrregs_info =
  {
    sh_num_regs,
    sh_regmap,
  };

static struct regs_info myregs_info =
  {
    NULL, /* regset_bitmap */
    &sh_usrregs_info,
    &sh_regsets_info
  };

const regs_info *
sh_target::get_regs_info ()
{
  return &myregs_info;
}

void
sh_target::low_arch_setup ()
{
  current_process ()->tdesc = tdesc_sh;
}

struct linux_target_ops the_low_target = {
  sh_cannot_fetch_register,
  sh_cannot_store_register,
  NULL, /* fetch_register */
  linux_get_pc_32bit,
  linux_set_pc_32bit,
  NULL, /* breakpoint_kind_from_pc */
  sh_sw_breakpoint_from_kind,
  NULL,
  0,
  sh_breakpoint_at,
  NULL, /* supports_z_point_type */
  NULL, /* insert_point */
  NULL, /* remove_point */
  NULL, /* stopped_by_watchpoint */
  NULL, /* stopped_data_address */
  NULL, /* collect_ptrace_register */
  NULL, /* supply_ptrace_register */
  NULL, /* siginfo_fixup */
  NULL, /* new_process */
  NULL, /* delete_process */
  NULL, /* new_thread */
  NULL, /* delete_thread */
  NULL, /* new_fork */
  NULL, /* prepare_to_resume */
  NULL, /* process_qsupported */
  NULL, /* supports_tracepoints */
  NULL, /* get_thread_area */
  NULL, /* install_fast_tracepoint_jump_pad */
  NULL, /* emit_ops */
  NULL, /* get_min_fast_tracepoint_insn_len */
  NULL, /* supports_range_stepping */
  NULL, /* breakpoint_kind_from_current_state */
  sh_supports_hardware_single_step,
};

/* The linux target ops object.  */

linux_process_target *the_linux_target = &the_sh_target;

void
initialize_low_arch (void)
{
  init_registers_sh ();

  initialize_regsets_info (&sh_regsets_info);
}