aboutsummaryrefslogtreecommitdiff
path: root/gdb/i386b-nat.c
blob: e784773f0834d439d81894c7ab3afdb8d05a5d0e (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
/* Native-dependent code for BSD Unix running on i386's, for GDB.
   Copyright 1988, 1989, 1991, 1992, 1994, 1996 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"

#ifdef FETCH_INFERIOR_REGISTERS
#include <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.h>
#include "inferior.h"

void
fetch_inferior_registers(regno)
     int regno;
{
  struct reg inferior_registers;

  ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4*NUM_REGS);
  registers_fetched ();
}

void
store_inferior_registers(regno)
     int regno;
{
  struct reg inferior_registers;

  memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4*NUM_REGS);
  ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0);
}

struct md_core {
  struct reg intreg;
  struct fpreg freg;
};

void
fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
     CORE_ADDR ignore;
{
  struct md_core *core_reg = (struct md_core *)core_reg_sect;

  /* integer registers */
  memcpy(&registers[REGISTER_BYTE (0)], &core_reg->intreg,
	 sizeof(struct reg));
  /* floating point registers */
  /* XXX */
}

#else

#include <machine/reg.h>

/* this table must line up with REGISTER_NAMES in tm-i386.h */
/* symbols like 'tEAX' come from <machine/reg.h> */
static int tregmap[] = 
{
  tEAX, tECX, tEDX, tEBX,
  tESP, tEBP, tESI, tEDI,
  tEIP, tEFLAGS, tCS, tSS
};

#ifdef sEAX
static int sregmap[] = 
{
  sEAX, sECX, sEDX, sEBX,
  sESP, sEBP, sESI, sEDI,
  sEIP, sEFLAGS, sCS, sSS
};
#else /* No sEAX */

/* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
   ones aren't around, use the t* ones for sregmap too.  */

static int sregmap[] = 
{
  tEAX, tECX, tEDX, tEBX,
  tESP, tEBP, tESI, tEDI,
  tEIP, tEFLAGS, tCS, tSS
};
#endif /* No sEAX */

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

int
i386_register_u_addr (blockend, regnum)
     int blockend;
     int regnum;
{
  /* The following condition is a kludge to get at the proper register map
     depending upon the state of pcb_flag.
     The proper condition would be
     if (u.u_pcb.pcb_flag & FM_TRAP)
     but that would require a ptrace call here and wouldn't work
     for corefiles.  */

  if (blockend < 0x1fcc)
    return (blockend + 4 * tregmap[regnum]);
  else
    return (blockend + 4 * sregmap[regnum]);
}

#endif /* !FETCH_INFERIOR_REGISTERS */

#ifdef FLOAT_INFO
#include "expression.h"
#include "language.h"			/* for local_hex_string */
#include "floatformat.h"

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

#include <a.out.h>

#include <sys/time.h>
#include <sys/resource.h>
#include <sys/uio.h>
#define curpcb Xcurpcb	/* XXX avoid leaking declaration from pcb.h */
#include <sys/user.h>
#undef curpcb
#include <sys/file.h>
#include "gdb_stat.h"
#include <sys/ptrace.h>

extern void print_387_control_word ();		/* i387-tdep.h */
extern void print_387_status_word ();

#define	fpstate		save87
#define	U_FPSTATE(u)	u.u_pcb.pcb_savefpu

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 void
print_387_status (status, ep)
     unsigned short status;
     struct env387 *ep;
{
  int i;
  int bothstatus;
  int top;
  int fpreg;
  
  bothstatus = ((status != 0) && (ep->status != 0));
  if (status != 0) 
    {
      if (bothstatus)
	printf_unfiltered ("u: ");
      print_387_status_word ((unsigned int)status);
    }
  
  if (ep->status != 0) 
    {
      if (bothstatus)
	printf_unfiltered ("e: ");
      print_387_status_word ((unsigned int)ep->status);
    }
  
  print_387_control_word ((unsigned int)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 >> (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]);
      
      floatformat_to_double(&floatformat_i387_ext, (char *) ep->regs[fpreg], 
			      &val);
      printf_unfiltered ("  %g\n", val);
    }
}

i386_float_info ()
{
  struct user u; /* just for address computations */
  int i;
  /* fpstate defined in <sys/user.h> */
  struct fpstate *fpstatep;
  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
  unsigned int uaddr;
  char fpvalid;
  unsigned int rounded_addr;
  unsigned int rounded_size;
  /*extern int corechan;*/
  int skip;
  extern int inferior_pid;
  
  uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
  if (inferior_pid) 
    {
      int *ip;
      
      rounded_addr = uaddr & -sizeof (int);
      rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
		      sizeof (int) - 1) / sizeof (int);
      skip = uaddr - rounded_addr;
      
      ip = (int *)buf;
      for (i = 0; i < rounded_size; i++) 
	{
	  *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
	  rounded_addr += sizeof (int);
	}
    } 
  else 
    {
      printf("float info: can't do a core file (yet)\n");
      return;
#if 0
      if (lseek (corechan, uaddr, 0) < 0)
	perror_with_name ("seek on core file");
      if (myread (corechan, buf, sizeof (struct fpstate)) < 0) 
	perror_with_name ("read from core file");
      skip = 0;
#endif
    }
  
  print_387_status (0, (struct env387 *)buf);
}

int
kernel_u_size ()
{
  return (sizeof (struct user));
}

#endif