aboutsummaryrefslogtreecommitdiff
path: root/gdb/gdbserver/linux-ppc-low.c
blob: 4b6ac30f69ef78c2b7ee4c6e55209a08fd32307a (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
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
/* GNU/Linux/PowerPC specific low level interface, for the remote server for
   GDB.
   Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007, 2008
   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 <elf.h>
#include <asm/ptrace.h>

/* These are in <asm/cputable.h> in current kernels.  */
#define PPC_FEATURE_HAS_VSX		0x00000080
#define PPC_FEATURE_HAS_ALTIVEC         0x10000000
#define PPC_FEATURE_HAS_SPE             0x00800000
#define PPC_FEATURE_ARCH_2_05           0x00001000

static unsigned long ppc_hwcap;


/* Defined in auto-generated file powerpc-32l.c.  */
void init_registers_powerpc_32l (void);
/* Defined in auto-generated file powerpc-altivec32l.c.  */
void init_registers_powerpc_altivec32l (void);
/* Defined in auto-generated file powerpc-vsx32l.c.  */
void init_registers_powerpc_vsx32l (void);
/* Defined in auto-generated file powerpc-isa205-32l.c.  */
void init_registers_powerpc_isa205_32l (void);
/* Defined in auto-generated file powerpc-isa205-altivec32l.c.  */
void init_registers_powerpc_isa205_altivec32l (void);
/* Defined in auto-generated file powerpc-isa205-vsx32l.c.  */
void init_registers_powerpc_isa205_vsx32l (void);
/* Defined in auto-generated file powerpc-e500l.c.  */
void init_registers_powerpc_e500l (void);
/* Defined in auto-generated file powerpc-64l.c.  */
void init_registers_powerpc_64l (void);
/* Defined in auto-generated file powerpc-altivec64l.c.  */
void init_registers_powerpc_altivec64l (void);
/* Defined in auto-generated file powerpc-vsx64l.c.  */
void init_registers_powerpc_vsx64l (void);
/* Defined in auto-generated file powerpc-isa205-64l.c.  */
void init_registers_powerpc_isa205_64l (void);
/* Defined in auto-generated file powerpc-isa205-altivec64l.c.  */
void init_registers_powerpc_isa205_altivec64l (void);
/* Defined in auto-generated file powerpc-isa205-vsx64l.c.  */
void init_registers_powerpc_isa205_vsx64l (void);

#define ppc_num_regs 73

/* This sometimes isn't defined.  */
#ifndef PT_ORIG_R3
#define PT_ORIG_R3 34
#endif
#ifndef PT_TRAP
#define PT_TRAP 40
#endif

#ifdef __powerpc64__
/* We use a constant for FPSCR instead of PT_FPSCR, because
   many shipped PPC64 kernels had the wrong value in ptrace.h.  */
static int ppc_regmap[] =
 {PT_R0 * 8,     PT_R1 * 8,     PT_R2 * 8,     PT_R3 * 8,
  PT_R4 * 8,     PT_R5 * 8,     PT_R6 * 8,     PT_R7 * 8,
  PT_R8 * 8,     PT_R9 * 8,     PT_R10 * 8,    PT_R11 * 8,
  PT_R12 * 8,    PT_R13 * 8,    PT_R14 * 8,    PT_R15 * 8,
  PT_R16 * 8,    PT_R17 * 8,    PT_R18 * 8,    PT_R19 * 8,
  PT_R20 * 8,    PT_R21 * 8,    PT_R22 * 8,    PT_R23 * 8,
  PT_R24 * 8,    PT_R25 * 8,    PT_R26 * 8,    PT_R27 * 8,
  PT_R28 * 8,    PT_R29 * 8,    PT_R30 * 8,    PT_R31 * 8,
  PT_FPR0*8,     PT_FPR0*8 + 8, PT_FPR0*8+16,  PT_FPR0*8+24,
  PT_FPR0*8+32,  PT_FPR0*8+40,  PT_FPR0*8+48,  PT_FPR0*8+56,
  PT_FPR0*8+64,  PT_FPR0*8+72,  PT_FPR0*8+80,  PT_FPR0*8+88,
  PT_FPR0*8+96,  PT_FPR0*8+104,  PT_FPR0*8+112,  PT_FPR0*8+120,
  PT_FPR0*8+128, PT_FPR0*8+136,  PT_FPR0*8+144,  PT_FPR0*8+152,
  PT_FPR0*8+160,  PT_FPR0*8+168,  PT_FPR0*8+176,  PT_FPR0*8+184,
  PT_FPR0*8+192,  PT_FPR0*8+200,  PT_FPR0*8+208,  PT_FPR0*8+216,
  PT_FPR0*8+224,  PT_FPR0*8+232,  PT_FPR0*8+240,  PT_FPR0*8+248,
  PT_NIP * 8,    PT_MSR * 8,    PT_CCR * 8,    PT_LNK * 8,
  PT_CTR * 8,    PT_XER * 8,    PT_FPR0*8 + 256,
  PT_ORIG_R3 * 8, PT_TRAP * 8 };
#else
/* Currently, don't check/send MQ.  */
static int ppc_regmap[] =
 {PT_R0 * 4,     PT_R1 * 4,     PT_R2 * 4,     PT_R3 * 4,
  PT_R4 * 4,     PT_R5 * 4,     PT_R6 * 4,     PT_R7 * 4,
  PT_R8 * 4,     PT_R9 * 4,     PT_R10 * 4,    PT_R11 * 4,
  PT_R12 * 4,    PT_R13 * 4,    PT_R14 * 4,    PT_R15 * 4,
  PT_R16 * 4,    PT_R17 * 4,    PT_R18 * 4,    PT_R19 * 4,
  PT_R20 * 4,    PT_R21 * 4,    PT_R22 * 4,    PT_R23 * 4,
  PT_R24 * 4,    PT_R25 * 4,    PT_R26 * 4,    PT_R27 * 4,
  PT_R28 * 4,    PT_R29 * 4,    PT_R30 * 4,    PT_R31 * 4,
  PT_FPR0*4,     PT_FPR0*4 + 8, PT_FPR0*4+16,  PT_FPR0*4+24,
  PT_FPR0*4+32,  PT_FPR0*4+40,  PT_FPR0*4+48,  PT_FPR0*4+56,
  PT_FPR0*4+64,  PT_FPR0*4+72,  PT_FPR0*4+80,  PT_FPR0*4+88,
  PT_FPR0*4+96,  PT_FPR0*4+104,  PT_FPR0*4+112,  PT_FPR0*4+120,
  PT_FPR0*4+128, PT_FPR0*4+136,  PT_FPR0*4+144,  PT_FPR0*4+152,
  PT_FPR0*4+160,  PT_FPR0*4+168,  PT_FPR0*4+176,  PT_FPR0*4+184,
  PT_FPR0*4+192,  PT_FPR0*4+200,  PT_FPR0*4+208,  PT_FPR0*4+216,
  PT_FPR0*4+224,  PT_FPR0*4+232,  PT_FPR0*4+240,  PT_FPR0*4+248,
  PT_NIP * 4,    PT_MSR * 4,    PT_CCR * 4,    PT_LNK * 4,
  PT_CTR * 4,    PT_XER * 4,    PT_FPSCR * 4,
  PT_ORIG_R3 * 4, PT_TRAP * 4
 };

static int ppc_regmap_e500[] =
 {PT_R0 * 4,     PT_R1 * 4,     PT_R2 * 4,     PT_R3 * 4,
  PT_R4 * 4,     PT_R5 * 4,     PT_R6 * 4,     PT_R7 * 4,
  PT_R8 * 4,     PT_R9 * 4,     PT_R10 * 4,    PT_R11 * 4,
  PT_R12 * 4,    PT_R13 * 4,    PT_R14 * 4,    PT_R15 * 4,
  PT_R16 * 4,    PT_R17 * 4,    PT_R18 * 4,    PT_R19 * 4,
  PT_R20 * 4,    PT_R21 * 4,    PT_R22 * 4,    PT_R23 * 4,
  PT_R24 * 4,    PT_R25 * 4,    PT_R26 * 4,    PT_R27 * 4,
  PT_R28 * 4,    PT_R29 * 4,    PT_R30 * 4,    PT_R31 * 4,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  -1,            -1,            -1,            -1,
  PT_NIP * 4,    PT_MSR * 4,    PT_CCR * 4,    PT_LNK * 4,
  PT_CTR * 4,    PT_XER * 4,    -1,
  PT_ORIG_R3 * 4, PT_TRAP * 4
 };
#endif

static int
ppc_cannot_store_register (int regno)
{
#ifndef __powerpc64__
  /* Some kernels do not allow us to store fpscr.  */
  if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE) && regno == find_regno ("fpscr"))
    return 2;
#endif

  /* Some kernels do not allow us to store orig_r3 or trap.  */
  if (regno == find_regno ("orig_r3")
      || regno == find_regno ("trap"))
    return 2;

  return 0;
}

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

static void
ppc_collect_ptrace_register (int regno, char *buf)
{
  int size = register_size (regno);

  memset (buf, 0, sizeof (long));

  if (size < sizeof (long))
    collect_register (regno, buf + sizeof (long) - size);
  else
    collect_register (regno, buf);
}

static void
ppc_supply_ptrace_register (int regno, const char *buf)
{
  int size = register_size (regno);
  if (size < sizeof (long))
    supply_register (regno, buf + sizeof (long) - size);
  else
    supply_register (regno, buf);
}

static CORE_ADDR
ppc_get_pc (void)
{
  if (register_size (0) == 4)
    {
      unsigned int pc;
      collect_register_by_name ("pc", &pc);
      return (CORE_ADDR) pc;
    }
  else
    {
      unsigned long pc;
      collect_register_by_name ("pc", &pc);
      return (CORE_ADDR) pc;
    }
}

static void
ppc_set_pc (CORE_ADDR pc)
{
  if (register_size (0) == 4)
    {
      unsigned int newpc = pc;
      supply_register_by_name ("pc", &newpc);
    }
  else
    {
      unsigned long newpc = pc;
      supply_register_by_name ("pc", &newpc);
    }
}


static int
ppc_get_hwcap (unsigned long *valp)
{
  int wordsize = register_size (0);
  unsigned char *data = alloca (2 * wordsize);
  int offset = 0;

  while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
    {
      if (wordsize == 4)
	{
	  unsigned int *data_p = (unsigned int *)data;
	  if (data_p[0] == AT_HWCAP)
	    {
	      *valp = data_p[1];
	      return 1;
	    }
	}
      else
	{
	  unsigned long *data_p = (unsigned long *)data;
	  if (data_p[0] == AT_HWCAP)
	    {
	      *valp = data_p[1];
	      return 1;
	    }
	}

      offset += 2 * wordsize;
    }

  *valp = 0;
  return 0;
}

static void
ppc_arch_setup (void)
{
#ifdef __powerpc64__
  long msr;

  /* On a 64-bit host, assume 64-bit inferior process with no
     AltiVec registers.  Reset ppc_hwcap to ensure that the
     collect_register call below does not fail.  */
  init_registers_powerpc_64l ();
  ppc_hwcap = 0;

  /* Only if the high bit of the MSR is set, we actually have
     a 64-bit inferior.  */
  collect_register_by_name ("msr", &msr);
  if (msr < 0)
    {
      ppc_get_hwcap (&ppc_hwcap);
      if (ppc_hwcap & PPC_FEATURE_HAS_VSX)
	{
	  if (ppc_hwcap & PPC_FEATURE_ARCH_2_05)
	    init_registers_powerpc_isa205_vsx64l ();
	  else
	    init_registers_powerpc_vsx64l ();
	}
      else if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
	{
	  if (ppc_hwcap & PPC_FEATURE_ARCH_2_05)
	    init_registers_powerpc_isa205_altivec64l ();
	  else
	    init_registers_powerpc_altivec64l ();
	}

      return;
    }
#endif

  /* OK, we have a 32-bit inferior.  */
  init_registers_powerpc_32l ();

  ppc_get_hwcap (&ppc_hwcap);
  if (ppc_hwcap & PPC_FEATURE_HAS_VSX)
    {
      if (ppc_hwcap & PPC_FEATURE_ARCH_2_05)
	init_registers_powerpc_isa205_vsx32l ();
      else
	init_registers_powerpc_vsx32l ();
    }
  else if (ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC)
    {
      if (ppc_hwcap & PPC_FEATURE_ARCH_2_05)
	init_registers_powerpc_isa205_altivec32l ();
      else
	init_registers_powerpc_altivec32l ();
    }

  /* On 32-bit machines, check for SPE registers.
     Set the low target's regmap field as appropriately.  */
#ifndef __powerpc64__
  the_low_target.regmap = ppc_regmap;
  if (ppc_hwcap & PPC_FEATURE_HAS_SPE)
    {
      init_registers_powerpc_e500l ();
      the_low_target.regmap = ppc_regmap_e500;
   }

  /* If the FPSCR is 64-bit wide, we need to fetch the whole 64-bit
     slot and not just its second word.  The PT_FPSCR supplied in a
     32-bit GDB compilation doesn't reflect this.  */
  if (register_size (70) == 8)
    ppc_regmap[70] = (48 + 2*32) * sizeof (long);
#endif
}

/* Correct in either endianness.
   This instruction is "twge r2, r2", which GDB uses as a software
   breakpoint.  */
static const unsigned int ppc_breakpoint = 0x7d821008;
#define ppc_breakpoint_len 4

static int
ppc_breakpoint_at (CORE_ADDR where)
{
  unsigned int insn;

  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
  if (insn == ppc_breakpoint)
    return 1;
  /* If necessary, recognize more trap instructions here.  GDB only uses the
     one.  */
  return 0;
}

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

static void ppc_fill_gregset (void *buf)
{
  int i;

  for (i = 0; i < 32; i++)
    ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);

  for (i = 64; i < 70; i++)
    ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);

  for (i = 71; i < 73; i++)
    ppc_collect_ptrace_register (i, (char *) buf + ppc_regmap[i]);
}

#ifndef PTRACE_GETVSXREGS
#define PTRACE_GETVSXREGS 27
#define PTRACE_SETVSXREGS 28
#endif

#define SIZEOF_VSXREGS 32*8

static void
ppc_fill_vsxregset (void *buf)
{
  int i, base;
  char *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_VSX))
    return;

  base = find_regno ("vs0h");
  for (i = 0; i < 32; i++)
    collect_register (base + i, &regset[i * 8]);
}

static void
ppc_store_vsxregset (const void *buf)
{
  int i, base;
  const char *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_VSX))
    return;

  base = find_regno ("vs0h");
  for (i = 0; i < 32; i++)
    supply_register (base + i, &regset[i * 8]);
}

#ifndef PTRACE_GETVRREGS
#define PTRACE_GETVRREGS 18
#define PTRACE_SETVRREGS 19
#endif

#define SIZEOF_VRREGS 33*16+4

static void
ppc_fill_vrregset (void *buf)
{
  int i, base;
  char *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
    return;

  base = find_regno ("vr0");
  for (i = 0; i < 32; i++)
    collect_register (base + i, &regset[i * 16]);

  collect_register_by_name ("vscr", &regset[32 * 16 + 12]);
  collect_register_by_name ("vrsave", &regset[33 * 16]);
}

static void
ppc_store_vrregset (const void *buf)
{
  int i, base;
  const char *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_ALTIVEC))
    return;

  base = find_regno ("vr0");
  for (i = 0; i < 32; i++)
    supply_register (base + i, &regset[i * 16]);

  supply_register_by_name ("vscr", &regset[32 * 16 + 12]);
  supply_register_by_name ("vrsave", &regset[33 * 16]);
}

#ifndef PTRACE_GETEVRREGS
#define PTRACE_GETEVRREGS	20
#define PTRACE_SETEVRREGS	21
#endif

struct gdb_evrregset_t
{
  unsigned long evr[32];
  unsigned long long acc;
  unsigned long spefscr;
};

static void
ppc_fill_evrregset (void *buf)
{
  int i, ev0;
  struct gdb_evrregset_t *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
    return;

  ev0 = find_regno ("ev0h");
  for (i = 0; i < 32; i++)
    collect_register (ev0 + i, &regset->evr[i]);

  collect_register_by_name ("acc", &regset->acc);
  collect_register_by_name ("spefscr", &regset->spefscr);
}

static void
ppc_store_evrregset (const void *buf)
{
  int i, ev0;
  const struct gdb_evrregset_t *regset = buf;

  if (!(ppc_hwcap & PPC_FEATURE_HAS_SPE))
    return;

  ev0 = find_regno ("ev0h");
  for (i = 0; i < 32; i++)
    supply_register (ev0 + i, &regset->evr[i]);

  supply_register_by_name ("acc", &regset->acc);
  supply_register_by_name ("spefscr", &regset->spefscr);
}

struct regset_info target_regsets[] = {
  /* List the extra register sets before GENERAL_REGS.  That way we will
     fetch them every time, but still fall back to PTRACE_PEEKUSER for the
     general registers.  Some kernels support these, but not the newer
     PPC_PTRACE_GETREGS.  */
  { PTRACE_GETVSXREGS, PTRACE_SETVSXREGS, SIZEOF_VSXREGS, EXTENDED_REGS,
  ppc_fill_vsxregset, ppc_store_vsxregset },
  { PTRACE_GETVRREGS, PTRACE_SETVRREGS, SIZEOF_VRREGS, EXTENDED_REGS,
    ppc_fill_vrregset, ppc_store_vrregset },
  { PTRACE_GETEVRREGS, PTRACE_SETEVRREGS, 32 * 4 + 8 + 4, EXTENDED_REGS,
    ppc_fill_evrregset, ppc_store_evrregset },
  { 0, 0, 0, GENERAL_REGS, ppc_fill_gregset, NULL },
  { 0, 0, -1, -1, NULL, NULL }
};

struct linux_target_ops the_low_target = {
  ppc_arch_setup,
  ppc_num_regs,
  ppc_regmap,
  ppc_cannot_fetch_register,
  ppc_cannot_store_register,
  ppc_get_pc,
  ppc_set_pc,
  (const unsigned char *) &ppc_breakpoint,
  ppc_breakpoint_len,
  NULL,
  0,
  ppc_breakpoint_at,
  NULL,
  NULL,
  NULL,
  NULL,
  ppc_collect_ptrace_register,
  ppc_supply_ptrace_register,
};