summaryrefslogtreecommitdiff
path: root/gdb/gdbserver/linux-s390-ipa.c
blob: 9c7142b546700fb6771633fee003f6bf70f880ed (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
/* GNU/Linux S/390 specific low level interface, for the in-process
   agent library for GDB.

   Copyright (C) 2016-2017 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 <sys/mman.h>
#include "tracepoint.h"
#include "linux-s390-tdesc.h"
#include <elf.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif

#define FT_FPR(x) (0x000 + (x) * 0x10)
#define FT_VR(x) (0x000 + (x) * 0x10)
#define FT_VR_L(x) (0x008 + (x) * 0x10)
#define FT_GPR(x) (0x200 + (x) * 8)
#define FT_GPR_U(x) (0x200 + (x) * 8)
#define FT_GPR_L(x) (0x204 + (x) * 8)
#define FT_GPR(x) (0x200 + (x) * 8)
#define FT_ACR(x) (0x280 + (x) * 4)
#define FT_PSWM 0x2c0
#define FT_PSWM_U 0x2c0
#define FT_PSWA 0x2c8
#define FT_PSWA_L 0x2cc
#define FT_FPC 0x2d0

/* Mappings between registers collected by the jump pad and GDB's register
   array layout used by regcache.

   See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more
   details.  */

#ifndef __s390x__

/* Used for s390-linux32, s390-linux32v1, s390-linux32v2.  */

static const int s390_linux32_ft_collect_regmap[] = {
  /* 32-bit PSWA and PSWM.  */
  FT_PSWM_U, FT_PSWA_L,
  /* 32-bit GPRs (mapped to lower halves of 64-bit slots).  */
  FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3),
  FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7),
  FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11),
  FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15),
  /* ACRs */
  FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  /* orig_r2, last_break, system_call */
  -1, -1, -1,
};

/* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64.  */

static const int s390_linux64_ft_collect_regmap[] = {
  /* 32-bit PSWA and PSWM.  */
  FT_PSWM_U, FT_PSWA_L,
  /* 32-bit halves of 64-bit GPRs.  */
  FT_GPR_U (0), FT_GPR_L (0),
  FT_GPR_U (1), FT_GPR_L (1),
  FT_GPR_U (2), FT_GPR_L (2),
  FT_GPR_U (3), FT_GPR_L (3),
  FT_GPR_U (4), FT_GPR_L (4),
  FT_GPR_U (5), FT_GPR_L (5),
  FT_GPR_U (6), FT_GPR_L (6),
  FT_GPR_U (7), FT_GPR_L (7),
  FT_GPR_U (8), FT_GPR_L (8),
  FT_GPR_U (9), FT_GPR_L (9),
  FT_GPR_U (10), FT_GPR_L (10),
  FT_GPR_U (11), FT_GPR_L (11),
  FT_GPR_U (12), FT_GPR_L (12),
  FT_GPR_U (13), FT_GPR_L (13),
  FT_GPR_U (14), FT_GPR_L (14),
  FT_GPR_U (15), FT_GPR_L (15),
  /* ACRs */
  FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  /* orig_r2, last_break, system_call */
  -1, -1, -1,
  /* Lower halves of 128-bit VRs. */
  FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
  FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
  FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
  FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
  /* And the next 16 VRs.  */
  FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
  FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
  FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
  FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};

/* Used for s390-te-linux64, s390-tevx-linux64.  */

static const int s390_te_linux64_ft_collect_regmap[] = {
  /* 32-bit PSWA and PSWM.  */
  FT_PSWM_U, FT_PSWA_L,
  /* 32-bit halves of 64-bit GPRs.  */
  FT_GPR_U (0), FT_GPR_L (0),
  FT_GPR_U (1), FT_GPR_L (1),
  FT_GPR_U (2), FT_GPR_L (2),
  FT_GPR_U (3), FT_GPR_L (3),
  FT_GPR_U (4), FT_GPR_L (4),
  FT_GPR_U (5), FT_GPR_L (5),
  FT_GPR_U (6), FT_GPR_L (6),
  FT_GPR_U (7), FT_GPR_L (7),
  FT_GPR_U (8), FT_GPR_L (8),
  FT_GPR_U (9), FT_GPR_L (9),
  FT_GPR_U (10), FT_GPR_L (10),
  FT_GPR_U (11), FT_GPR_L (11),
  FT_GPR_U (12), FT_GPR_L (12),
  FT_GPR_U (13), FT_GPR_L (13),
  FT_GPR_U (14), FT_GPR_L (14),
  FT_GPR_U (15), FT_GPR_L (15),
  /* ACRs */
  FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  /* orig_r2, last_break, system_call */
  -1, -1, -1,
  /* TDB */
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  /* Lower halves of 128-bit VRs. */
  FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
  FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
  FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
  FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
  /* And the next 16 VRs.  */
  FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
  FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
  FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
  FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};

#else /* __s390x__ */

/* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64.  */

static const int s390x_ft_collect_regmap[] = {
  /* 64-bit PSWA and PSWM.  */
  FT_PSWM, FT_PSWA,
  /* 64-bit GPRs.  */
  FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
  FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
  FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
  FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
  /* ACRs */
  FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  /* orig_r2, last_break, system_call */
  -1, -1, -1,
  /* Lower halves of 128-bit VRs. */
  FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
  FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
  FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
  FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
  /* And the next 16 VRs.  */
  FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
  FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
  FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
  FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};

/* Used for s390x-te-linux64, s390x-tevx-linux64.  */

static const int s390x_te_ft_collect_regmap[] = {
  /* 64-bit PSWA and PSWM.  */
  FT_PSWM, FT_PSWA,
  /* 64-bit GPRs.  */
  FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
  FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
  FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
  FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
  /* ACRs */
  FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
  FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
  FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
  FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
  /* FPRs (mapped to upper halves of 128-bit VR slots).  */
  FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
  FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
  FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
  FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
  /* orig_r2, last_break, system_call */
  -1, -1, -1,
  /* TDB */
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  -1, -1, -1, -1,
  /* Lower halves of 128-bit VRs. */
  FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
  FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
  FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
  FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
  /* And the next 16 VRs.  */
  FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
  FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
  FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
  FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
};

#endif

/* Initialized by get_ipa_tdesc according to the tdesc in use.  */

static const int *s390_regmap;
static int s390_regnum;

/* Fill in REGCACHE with registers saved by the jump pad in BUF.  */

void
supply_fast_tracepoint_registers (struct regcache *regcache,
				  const unsigned char *buf)
{
  int i;
  for (i = 0; i < s390_regnum; i++)
    if (s390_regmap[i] != -1)
      supply_register (regcache, i, ((char *) buf) + s390_regmap[i]);
}

ULONGEST
get_raw_reg (const unsigned char *raw_regs, int regnum)
{
  int offset;
  if (regnum >= s390_regnum)
    return 0;
  offset = s390_regmap[regnum];
  if (offset == -1)
    return 0;

  /* The regnums are variable, better to figure out size by FT offset.  */

  /* 64-bit ones.  */
  if (offset < FT_VR(16)
#ifdef __s390x__
      || (offset >= FT_GPR(0) && offset < FT_ACR(0))
      || offset == FT_PSWM
      || offset == FT_PSWA
#endif
     )
    return *(uint64_t *) (raw_regs + offset);

  if (offset >= FT_ACR(0 && offset < FT_PSWM)
      || offset == FT_FPC
#ifndef __s390x__
      || (offset >= FT_GPR(0) && offset < FT_ACR(0))
      || offset == FT_PSWM_U
      || offset == FT_PSWA_L
#endif
     )
    return *(uint32_t *) (raw_regs + offset);

  /* This leaves 128-bit VX.  No way to return them.  */
  return 0;
}

/* Return target_desc to use for IPA, given the tdesc index passed by
   gdbserver.  For s390, it also sets s390_regmap and s390_regnum.  */

const struct target_desc *
get_ipa_tdesc (int idx)
{
#define SET_REGMAP(regmap, skip_last) \
	do { \
	  s390_regmap = regmap; \
	  s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \
	} while(0)
  switch (idx)
    {
#ifdef __s390x__
    case S390_TDESC_64:
      /* Subtract number of VX regs.  */
      SET_REGMAP(s390x_ft_collect_regmap, 32);
      return tdesc_s390x_linux64;
    case S390_TDESC_64V1:
      SET_REGMAP(s390x_ft_collect_regmap, 32);
      return tdesc_s390x_linux64v1;
    case S390_TDESC_64V2:
      SET_REGMAP(s390x_ft_collect_regmap, 32);
      return tdesc_s390x_linux64v2;
    case S390_TDESC_TE:
      SET_REGMAP(s390x_te_ft_collect_regmap, 32);
      return tdesc_s390x_te_linux64;
    case S390_TDESC_VX:
      SET_REGMAP(s390x_ft_collect_regmap, 0);
      return tdesc_s390x_vx_linux64;
    case S390_TDESC_TEVX:
      SET_REGMAP(s390x_te_ft_collect_regmap, 0);
      return tdesc_s390x_tevx_linux64;
#else
    case S390_TDESC_32:
      SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
      return tdesc_s390_linux32;
    case S390_TDESC_32V1:
      SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
      return tdesc_s390_linux32v1;
    case S390_TDESC_32V2:
      SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
      return tdesc_s390_linux32v2;
    case S390_TDESC_64:
      SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
      return tdesc_s390_linux64;
    case S390_TDESC_64V1:
      SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
      return tdesc_s390_linux64v1;
    case S390_TDESC_64V2:
      SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
      return tdesc_s390_linux64v2;
    case S390_TDESC_TE:
      SET_REGMAP(s390_te_linux64_ft_collect_regmap, 32);
      return tdesc_s390_te_linux64;
    case S390_TDESC_VX:
      SET_REGMAP(s390_linux64_ft_collect_regmap, 0);
      return tdesc_s390_vx_linux64;
    case S390_TDESC_TEVX:
      SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
      return tdesc_s390_tevx_linux64;
#endif
    default:
      internal_error (__FILE__, __LINE__,
		      "unknown ipa tdesc index: %d", idx);
#ifdef __s390x__
      return tdesc_s390x_linux64;
#else
      return tdesc_s390_linux32;
#endif
    }
}

/* Allocate buffer for the jump pads.  On 31-bit, JG reaches everywhere,
   so just allocate normally.  On 64-bit, we have +/-4GiB of reach, and
   the executable is usually mapped at 0x80000000 - aim for somewhere
   below it.  */

void *
alloc_jump_pad_buffer (size_t size)
{
#ifdef __s390x__
  uintptr_t addr;
  uintptr_t exec_base = getauxval (AT_PHDR);
  int pagesize;
  void *res;

  if (exec_base == 0)
    exec_base = 0x80000000;

  pagesize = sysconf (_SC_PAGE_SIZE);
  if (pagesize == -1)
    perror_with_name ("sysconf");

  addr = exec_base - size;

  /* size should already be page-aligned, but this can't hurt.  */
  addr &= ~(pagesize - 1);

  /* Search for a free area.  If we hit 0, we're out of luck.  */
  for (; addr; addr -= pagesize)
    {
      /* No MAP_FIXED - we don't want to zap someone's mapping.  */
      res = mmap ((void *) addr, size,
		  PROT_READ | PROT_WRITE | PROT_EXEC,
		  MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

      /* If we got what we wanted, return.  */
      if ((uintptr_t) res == addr)
	return res;

      /* If we got a mapping, but at a wrong address, undo it.  */
      if (res != MAP_FAILED)
	munmap (res, size);
    }

  return NULL;
#else
  void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
		    MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  if (res == MAP_FAILED)
    return NULL;

  return res;
#endif
}

void
initialize_low_tracepoint (void)
{
#ifdef __s390x__
  init_registers_s390x_linux64 ();
  init_registers_s390x_linux64v1 ();
  init_registers_s390x_linux64v2 ();
  init_registers_s390x_te_linux64 ();
  init_registers_s390x_vx_linux64 ();
  init_registers_s390x_tevx_linux64 ();
#else
  init_registers_s390_linux32 ();
  init_registers_s390_linux32v1 ();
  init_registers_s390_linux32v2 ();
  init_registers_s390_linux64 ();
  init_registers_s390_linux64v1 ();
  init_registers_s390_linux64v2 ();
  init_registers_s390_te_linux64 ();
  init_registers_s390_vx_linux64 ();
  init_registers_s390_tevx_linux64 ();
#endif
}