aboutsummaryrefslogtreecommitdiff
path: root/gdbserver/linux-sparc-low.cc
blob: ae3f8c93a7172a6ad5e6d7322c4f1a0e39ca499c (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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/* Low level interface to ptrace, 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"

#include "nat/gdb_ptrace.h"

#include "gdb_proc_service.h"

/* The stack pointer is offset from the stack frame by a BIAS of 2047
   (0x7ff) for 64-bit code.  BIAS is likely to be defined on SPARC
   hosts, so undefine it first.  */
#undef BIAS
#define BIAS 2047

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

#define INSN_SIZE 4

#define SPARC_R_REGS_NUM 32
#define SPARC_F_REGS_NUM 48
#define SPARC_CONTROL_REGS_NUM 6

#define sparc_num_regs \
  (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)

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

class sparc_target : public linux_process_target
{
public:

  const regs_info *get_regs_info () override;

  const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;

protected:

  void low_arch_setup () override;

  bool low_cannot_fetch_register (int regno) override;

  bool low_cannot_store_register (int regno) override;

  bool low_supports_breakpoints () override;

  CORE_ADDR low_get_pc (regcache *regcache) override;

  /* No low_set_pc is needed.  */

  bool low_breakpoint_at (CORE_ADDR pc) override;
};

/* The singleton target ops object.  */

static sparc_target the_sparc_target;

bool
sparc_target::low_supports_breakpoints ()
{
  return true;
}

CORE_ADDR
sparc_target::low_get_pc (regcache *regcache)
{
  return linux_get_pc_64bit (regcache);
}

/* Each offset is multiplied by 8, because of the register size.
   These offsets apply to the buffer sent/filled by ptrace.
   Additionally, the array elements order corresponds to the .dat file, and the
   gdb's registers enumeration order.  */

static int sparc_regmap[] = {
  /* These offsets correspond to GET/SETREGSET.  */
	-1,  0*8,  1*8,  2*8,  3*8,  4*8,  5*8,  6*8,	 /* g0 .. g7 */
	7*8,  8*8,  9*8, 10*8, 11*8, 12*8, 13*8, 14*8,	 /* o0 .. o5, sp, o7 */
	-1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,	 /* l0 .. l7 */
	-1,   -1,   -1,   -1,   -1,   -1,   -1,   -1,	 /* i0 .. i5, fp, i7 */

  /* Floating point registers offsets correspond to GET/SETFPREGSET.  */
    0*4,  1*4,  2*4,  3*4,  4*4,  5*4,  6*4,  7*4,	   /*  f0 ..  f7 */
    8*4,  9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4,	   /*  f8 .. f15 */
   16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4,	   /* f16 .. f23 */
   24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4,	   /* f24 .. f31 */

  /* F32 offset starts next to f31: 31*4+4 = 16 * 8.  */
   16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8,	   /* f32 .. f46 */
   24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8,	   /* f48 .. f62 */

   17 *8, /*    pc */
   18 *8, /*   npc */
   16 *8, /* state */
  /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
     next to f62.  */
   32 *8, /*   fsr */
      -1, /*  fprs */
  /* Y register is 32-bits length, but gdb takes care of that.  */
   19 *8, /*     y */

};


struct regs_range_t
{
  int regno_start;
  int regno_end;
};

static const struct regs_range_t gregs_ranges[] = {
 {  0, 31 }, /*   g0 .. i7  */
 { 80, 82 }, /*   pc .. state */
 { 84, 85 }  /* fprs .. y */
};

#define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))

static const struct regs_range_t fpregs_ranges[] = {
 { 32, 79 }, /* f0 .. f62  */
 { 83, 83 }  /* fsr */
};

#define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))

/* Defined in auto-generated file reg-sparc64.c.  */
void init_registers_sparc64 (void);
extern const struct target_desc *tdesc_sparc64;

bool
sparc_target::low_cannot_store_register (int regno)
{
  return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
}

bool
sparc_target::low_cannot_fetch_register (int regno)
{
  return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
}

static void
sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)
{
  int i;
  CORE_ADDR addr = 0;
  unsigned char tmp_reg_buf[8];
  const int l0_regno = find_regno (regcache->tdesc, "l0");
  const int i7_regno = l0_regno + 15;

  /* These registers have to be stored in the stack.  */
  memcpy (&addr,
	  ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
	  sizeof (addr));

  addr += BIAS;

  for (i = l0_regno; i <= i7_regno; i++)
    {
      collect_register (regcache, i, tmp_reg_buf);
      the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
      addr += sizeof (tmp_reg_buf);
    }
}

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

  for (range = 0; range < N_GREGS_RANGES; range++)
    for (i = gregs_ranges[range].regno_start;
	 i <= gregs_ranges[range].regno_end; i++)
      if (sparc_regmap[i] != -1)
	collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

  sparc_fill_gregset_to_stack (regcache, buf);
}

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

  for (range = 0; range < N_FPREGS_RANGES; range++)
    for (i = fpregs_ranges[range].regno_start;
	 i <= fpregs_ranges[range].regno_end; i++)
      collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

}

static void
sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
{
  int i;
  CORE_ADDR addr = 0;
  unsigned char tmp_reg_buf[8];
  const int l0_regno = find_regno (regcache->tdesc, "l0");
  const int i7_regno = l0_regno + 15;

  /* These registers have to be obtained from the stack.  */
  memcpy (&addr,
	  ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
	  sizeof (addr));

  addr += BIAS;

  for (i = l0_regno; i <= i7_regno; i++)
    {
      the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
      supply_register (regcache, i, tmp_reg_buf);
      addr += sizeof (tmp_reg_buf);
    }
}

static void
sparc_store_gregset (struct regcache *regcache, const void *buf)
{
  int i;
  char zerobuf[8];
  int range;

  memset (zerobuf, 0, sizeof (zerobuf));

  for (range = 0; range < N_GREGS_RANGES; range++)
    for (i = gregs_ranges[range].regno_start;
	 i <= gregs_ranges[range].regno_end; i++)
      if (sparc_regmap[i] != -1)
	supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
      else
	supply_register (regcache, i, zerobuf);

  sparc_store_gregset_from_stack (regcache, buf);
}

static void
sparc_store_fpregset (struct regcache *regcache, const void *buf)
{
  int i;
  int range;

  for (range = 0; range < N_FPREGS_RANGES; range++)
    for (i = fpregs_ranges[range].regno_start;
	 i <= fpregs_ranges[range].regno_end;
	 i++)
      supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
}

static const gdb_byte sparc_breakpoint[INSN_SIZE] = {
  0x91, 0xd0, 0x20, 0x01
};
#define sparc_breakpoint_len INSN_SIZE

/* Implementation of target ops method "sw_breakpoint_from_kind".  */

const gdb_byte *
sparc_target::sw_breakpoint_from_kind (int kind, int *size)
{
  *size = sparc_breakpoint_len;
  return sparc_breakpoint;
}

bool
sparc_target::low_breakpoint_at (CORE_ADDR where)
{
  unsigned char insn[INSN_SIZE];

  read_memory (where, (unsigned char *) insn, sizeof (insn));

  if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
    return true;

  /* If necessary, recognize more trap instructions here.  GDB only
     uses TRAP Always.  */

  return false;
}

void
sparc_target::low_arch_setup ()
{
  current_process ()->tdesc = tdesc_sparc64;
}

static struct regset_info sparc_regsets[] = {
  { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
    GENERAL_REGS,
    sparc_fill_gregset, sparc_store_gregset },
  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
    FP_REGS,
    sparc_fill_fpregset, sparc_store_fpregset },
  NULL_REGSET
};

static struct regsets_info sparc_regsets_info =
  {
    sparc_regsets, /* regsets */
    0, /* num_regsets */
    NULL, /* disabled_regsets */
  };

static struct usrregs_info sparc_usrregs_info =
  {
    sparc_num_regs,
    /* No regmap needs to be provided since this impl. doesn't use
       USRREGS.  */
    NULL
  };

static struct regs_info myregs_info =
  {
    NULL, /* regset_bitmap */
    &sparc_usrregs_info,
    &sparc_regsets_info
  };

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

/* The linux target ops object.  */

linux_process_target *the_linux_target = &the_sparc_target;

void
initialize_low_arch (void)
{
  /* Initialize the Linux target descriptions.  */
  init_registers_sparc64 ();

  initialize_regsets_info (&sparc_regsets_info);
}