aboutsummaryrefslogtreecommitdiff
path: root/gdb/i386aix-nat.c
blob: 2c02ef7cf69a807faaefdbdb08f1af9e21147bf1 (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
/* Intel 386 native support.
   Copyright (C) 1988, 1989, 1991, 1992 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"

#ifdef USG
#include <sys/types.h>
#endif

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>

#include <sys/file.h>
#include "gdb_stat.h"

#include <stddef.h>
#include <sys/ptrace.h>

/* Does AIX define this in <errno.h>?  */
extern int errno;

#ifndef NO_SYS_REG_H
#include <sys/reg.h>
#endif

#include "floatformat.h"

#include "target.h"


/* this table must line up with REGISTER_NAMES in tm-i386v.h */
/* symbols like 'EAX' come from <sys/reg.h> */
static int regmap[] = 
{
  EAX, ECX, EDX, EBX,
  USP, EBP, ESI, EDI,
  EIP, EFL, CS, SS,
  DS, ES, FS, GS,
};

/* blockend is the value of u.u_ar0, and points to the
 * place where GS is stored
 */

int
i386_register_u_addr (blockend, regnum)
     int blockend;
     int regnum;
{
#if 0
  /* this will be needed if fp registers are reinstated */
  /* for now, you can look at them with 'info float'
   * sys5 wont let you change them with ptrace anyway
   */
  if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) 
    {
      int ubase, fpstate;
      struct user u;
      ubase = blockend + 4 * (SS + 1) - KSTKSZ;
      fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
    } 
  else
#endif
    return (blockend + 4 * regmap[regnum]);
  
}

/* The code below only work on the aix ps/2 (i386-ibm-aix) -
 * mtranle@paris - Sat Apr 11 10:34:12 1992
 */

struct env387 
{
  unsigned short control;
  unsigned short r0;
  unsigned short status;
  unsigned short r1;
  unsigned short tag;
  unsigned short r2;
  unsigned long eip;
  unsigned short code_seg;
  unsigned short opcode;
  unsigned long operand;
  unsigned short operand_seg;
  unsigned short r3;
  unsigned char regs[8][10];
};

static
print_387_status (status, ep)
     unsigned short status;
     struct env387 *ep;
{
  int i;
  int bothstatus;
  int top;
  int fpreg;
  unsigned char *p;
  
  bothstatus = ((status != 0) && (ep->status != 0));
  if (status != 0) 
    {
      if (bothstatus)
	printf_unfiltered ("u: ");
      print_387_status_word (status);
    }
  
  if (ep->status != 0) 
    {
      if (bothstatus)
	printf_unfiltered ("e: ");
      print_387_status_word (ep->status);
    }
  
  print_387_control_word (ep->control);
  printf_unfiltered ("last exception: ");
  printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
  printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
  printf_unfiltered ("%s; ", local_hex_string(ep->eip));
  printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
  printf_unfiltered (":%s\n", local_hex_string(ep->operand));

  top = ((ep->status >> 11) & 7);

  printf_unfiltered ("regno  tag  msb              lsb  value\n");
  for (fpreg = 7; fpreg >= 0; fpreg--) 
    {
      double val;

      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);

      switch ((ep->tag >> ((7 - fpreg) * 2)) & 3) 
	{
	case 0: printf_unfiltered ("valid "); break;
	case 1: printf_unfiltered ("zero  "); break;
	case 2: printf_unfiltered ("trap  "); break;
	case 3: printf_unfiltered ("empty "); break;
	}
      for (i = 9; i >= 0; i--)
	printf_unfiltered ("%02x", ep->regs[fpreg][i]);
      
      i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
      printf_unfiltered ("  %#g\n", val);
    }
}

static struct env387 core_env387;

void
i386_float_info ()
{
  struct env387 fps;
  int fpsaved = 0;
  /* We need to reverse the order of the registers.  Apparently AIX stores
     the highest-numbered ones first.  */
  struct env387 fps_fixed;
  int i;

  if (inferior_pid)
    {
      char buf[10];
      unsigned short status;

      ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
      memcpy (&status, buf, sizeof (status));
      fpsaved = status;
    }
  else
    {
      if ((fpsaved = core_env387.status) != 0)
	memcpy(&fps, &core_env387, sizeof(fps));
    }
  
  if (fpsaved == 0) 
    {
      printf_unfiltered ("no floating point status saved\n");
      return;
    }

  if (inferior_pid)
    {
      int offset;
      for (offset = 0; offset < sizeof(fps); offset += 10)
	{
	  char buf[10];
	  ptrace (PT_READ_FPR, inferior_pid, buf, offset);
	  memcpy ((char *)&fps.control + offset, buf,
		  MIN(10, sizeof(fps) - offset));
	}
    } 
  fps_fixed = fps;
  for (i = 0; i < 8; ++i)
    memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
  print_387_status (0, &fps_fixed);
}

/* Fetch one register.  */
static void
fetch_register (regno)
     int regno;
{
  char buf[MAX_REGISTER_RAW_SIZE];
  if (regno < FP0_REGNUM)
    *(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
			  PT_REG(regmap[regno]), 0, 0);
  else
    ptrace (PT_READ_FPR, inferior_pid, buf,
	    (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
  supply_register (regno, buf);
}

void
fetch_inferior_registers (regno)
     int regno;
{
  if (regno < 0)
    for (regno = 0; regno < NUM_REGS; regno++)
      fetch_register (regno);
  else
    fetch_register (regno);
}

/* store one register */
static void
store_register (regno)
     int regno;
{
  char buf[80];
  extern char registers[];
  errno = 0;
  if (regno < FP0_REGNUM)
    ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
	    *(int *) &registers[REGISTER_BYTE (regno)], 0);
  else
    ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
	    (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));

  if (errno != 0)
    {
      sprintf (buf, "writing register number %d", regno);
      perror_with_name (buf);
    }
}

/* Store our register values back into the inferior.
   If REGNO is -1, do this for all registers.
   Otherwise, REGNO specifies which register (so we can save time).  */
void
store_inferior_registers (regno)
     int regno;
{
  if (regno < 0)
    for (regno = 0; regno < NUM_REGS; regno++)
      store_register (regno);
  else
    store_register (regno);
}

#ifndef CD_AX			/* defined in sys/i386/coredump.h */
# define CD_AX	0
# define CD_BX	1
# define CD_CX	2
# define CD_DX	3
# define CD_SI	4
# define CD_DI	5
# define CD_BP	6
# define CD_SP	7
# define CD_FL	8
# define CD_IP	9
# define CD_CS	10
# define CD_DS	11
# define CD_ES	12
# define CD_FS	13
# define CD_GS	14
# define CD_SS	15
#endif

/*
 * The order here in core_regmap[] has to be the same as in 
 * regmap[] above.
 */
static int core_regmap[] = 
{
  CD_AX, CD_CX, CD_DX, CD_BX,
  CD_SP, CD_BP, CD_SI, CD_DI,
  CD_IP, CD_FL, CD_CS, CD_SS,
  CD_DS, CD_ES, CD_FS, CD_GS,
};

void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     unsigned int reg_addr;	/* ignored */
{

  if (which == 0)
    {
      /* Integer registers */

#define cd_regs(n) ((int *)core_reg_sect)[n]
#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])

      int i;
      for (i = 0; i < FP0_REGNUM; i++)
	regs(i) = cd_regs(core_regmap[i]);
    }
  else if (which == 2)
    {
      /* Floating point registers */

      if (core_reg_size >= sizeof (core_env387))
	memcpy (&core_env387, core_reg_sect, core_reg_size);
      else
	fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
    }
}