aboutsummaryrefslogtreecommitdiff
path: root/gdb/gdbserver/linux-s390-low.c
blob: eb865dc35cca77495bad5c0d49d8493a361d1077 (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
/* GNU/Linux S/390 specific low level interface, for the remote server
   for GDB.
   Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
   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/>.  */

/* This file is used for both 31-bit and 64-bit S/390 systems.  */

#include "server.h"
#include "linux-low.h"

#include <asm/ptrace.h>
#include <elf.h>

#ifndef HWCAP_S390_HIGH_GPRS
#define HWCAP_S390_HIGH_GPRS 512
#endif

/* Defined in auto-generated file s390-linux32.c.  */
void init_registers_s390_linux32 (void);
/* Defined in auto-generated file s390-linux64.c.  */
void init_registers_s390_linux64 (void);
/* Defined in auto-generated file s390x-linux64.c.  */
void init_registers_s390x_linux64 (void);

#define s390_num_regs 51

static int s390_regmap[] = {
  PT_PSWMASK, PT_PSWADDR,

  PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
  PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
  PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
  PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,

  PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
  PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
  PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
  PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,

  PT_FPC,

#ifndef __s390x__
  PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
  PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
  PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
  PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
#else
  PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
  PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
  PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
  PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
#endif
};

#ifdef __s390x__
#define s390_num_regs_3264 67

static int s390_regmap_3264[] = {
  PT_PSWMASK, PT_PSWADDR,

  PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1, PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
  PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5, PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
  PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9, PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
  PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13, PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,

  PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
  PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
  PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
  PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,

  PT_FPC,

  PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
  PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
  PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
  PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
};
#endif


static int
s390_cannot_fetch_register (int regno)
{
  return 0;
}

static int
s390_cannot_store_register (int regno)
{
  return 0;
}

static void
s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
{
  int size = register_size (regno);
  if (size < sizeof (long))
    {
      int regaddr = the_low_target.regmap[regno];

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

      if ((regno ^ 1) < the_low_target.num_regs
	  && the_low_target.regmap[regno ^ 1] == regaddr)
	{
	  collect_register (regcache, regno & ~1, buf);
	  collect_register (regcache, (regno & ~1) + 1,
			    buf + sizeof (long) - size);
	}
      else if (regaddr == PT_PSWADDR
	       || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
	collect_register (regcache, regno, buf + sizeof (long) - size);
      else
	collect_register (regcache, regno, buf);

      /* When debugging a 32-bit inferior on a 64-bit host, make sure
	 the 31-bit addressing mode bit is set in the PSW mask.  */
      if (regaddr == PT_PSWMASK)
	buf[size] |= 0x80;
    }
  else
    collect_register (regcache, regno, buf);
}

static void
s390_supply_ptrace_register (struct regcache *regcache, int regno, const char *buf)
{
  int size = register_size (regno);
  if (size < sizeof (long))
    {
      int regaddr = the_low_target.regmap[regno];

      if ((regno ^ 1) < the_low_target.num_regs
	  && the_low_target.regmap[regno ^ 1] == regaddr)
	{
	  supply_register (regcache, regno & ~1, buf);
	  supply_register (regcache, (regno & ~1) + 1,
			   buf + sizeof (long) - size);
	}
      else if (regaddr == PT_PSWADDR
	       || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
	supply_register (regcache, regno, buf + sizeof (long) - size);
      else
	supply_register (regcache, regno, buf);
    }
  else
    supply_register (regcache, regno, buf);
}

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

static void s390_fill_gregset (struct regcache *regcache, void *buf)
{
  int i;

  for (i = 0; i < the_low_target.num_regs; i++)
    {
      if (the_low_target.regmap[i] < PT_PSWMASK
	  || the_low_target.regmap[i] > PT_ACR15)
	continue;

      s390_collect_ptrace_register (regcache, i, (char *) buf
				       + the_low_target.regmap[i]);
    }
}

struct regset_info target_regsets[] = {
  { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
  { 0, 0, 0, -1, -1, NULL, NULL }
};


static const unsigned char s390_breakpoint[] = { 0, 1 };
#define s390_breakpoint_len 2

static CORE_ADDR
s390_get_pc (struct regcache *regcache)
{
  if (register_size (0) == 4)
    {
      unsigned int pc;
      collect_register_by_name (regcache, "pswa", &pc);
#ifndef __s390x__
      pc &= 0x7fffffff;
#endif
      return pc;
    }
  else
    {
      unsigned long pc;
      collect_register_by_name (regcache, "pswa", &pc);
      return pc;
    }
}

static void
s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
{
  if (register_size (0) == 4)
    {
      unsigned int pc = newpc;
#ifndef __s390x__
      pc |= 0x80000000;
#endif
      supply_register_by_name (regcache, "pswa", &pc);
    }
  else
    {
      unsigned long pc = newpc;
      supply_register_by_name (regcache, "pswa", &pc);
    }
}

#ifdef __s390x__
static unsigned long
s390_get_hwcap (void)
{
  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)
	    return data_p[1];
        }
      else
        {
          unsigned long *data_p = (unsigned long *)data;
          if (data_p[0] == AT_HWCAP)
	    return data_p[1];
        }

      offset += 2 * wordsize;
    }

  return 0;
}
#endif

static void
s390_arch_setup (void)
{
  /* Assume 31-bit inferior process.  */
  init_registers_s390_linux32 ();
  the_low_target.num_regs = s390_num_regs;
  the_low_target.regmap = s390_regmap;

  /* On a 64-bit host, check the low bit of the (31-bit) PSWM
     -- if this is one, we actually have a 64-bit inferior.  */
#ifdef __s390x__
  {
    unsigned int pswm;
    struct regcache *regcache = get_thread_regcache (current_inferior, 1);
    collect_register_by_name (regcache, "pswm", &pswm);
    if (pswm & 1)
      init_registers_s390x_linux64 ();

    /* For a 31-bit inferior, check whether the kernel supports
       using the full 64-bit GPRs.  */
    else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
      {
        init_registers_s390_linux64 ();
	the_low_target.num_regs = s390_num_regs_3264;
	the_low_target.regmap = s390_regmap_3264;
      }
  }
#endif
}


static int
s390_breakpoint_at (CORE_ADDR pc)
{
  unsigned char c[s390_breakpoint_len];
  read_inferior_memory (pc, c, s390_breakpoint_len);
  return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
}


struct linux_target_ops the_low_target = {
  s390_arch_setup,
  s390_num_regs,
  s390_regmap,
  s390_cannot_fetch_register,
  s390_cannot_store_register,
  s390_get_pc,
  s390_set_pc,
  s390_breakpoint,
  s390_breakpoint_len,
  NULL,
  s390_breakpoint_len,
  s390_breakpoint_at,
  NULL,
  NULL,
  NULL,
  NULL,
  s390_collect_ptrace_register,
  s390_supply_ptrace_register,
};