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[/] [or1k/] [trunk/] [gdb-5.0/] [gdb/] [i386b-nat.c] - Blame information for rev 1765

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1 104 markom
/* Native-dependent code for BSD Unix running on i386's, for GDB.
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   Copyright 1988, 1989, 1991, 1992, 1994, 1996 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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11
   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include "defs.h"
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#ifdef FETCH_INFERIOR_REGISTERS
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include "inferior.h"
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#include "gdbcore.h" /* for registers_fetched() */
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void
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fetch_inferior_registers (regno)
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     int regno;
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{
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  struct reg inferior_registers;
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  ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
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  memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
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  registers_fetched ();
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}
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void
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store_inferior_registers (regno)
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     int regno;
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{
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  struct reg inferior_registers;
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  memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
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  ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
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}
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struct md_core
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{
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  struct reg intreg;
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  struct fpreg freg;
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};
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void
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fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
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     char *core_reg_sect;
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     unsigned core_reg_size;
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     int which;
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     CORE_ADDR ignore;
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{
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  struct md_core *core_reg = (struct md_core *) core_reg_sect;
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  /* integer registers */
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  memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
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          sizeof (struct reg));
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  /* floating point registers */
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  /* XXX */
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}
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#else
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#include <machine/reg.h>
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/* this table must line up with REGISTER_NAMES in tm-i386.h */
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/* symbols like 'tEAX' come from <machine/reg.h> */
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static int tregmap[] =
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{
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  tEAX, tECX, tEDX, tEBX,
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  tESP, tEBP, tESI, tEDI,
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  tEIP, tEFLAGS, tCS, tSS
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};
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#ifdef sEAX
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static int sregmap[] =
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{
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  sEAX, sECX, sEDX, sEBX,
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  sESP, sEBP, sESI, sEDI,
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  sEIP, sEFLAGS, sCS, sSS
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};
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#else /* No sEAX */
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/* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
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   ones aren't around, use the t* ones for sregmap too.  */
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static int sregmap[] =
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{
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  tEAX, tECX, tEDX, tEBX,
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  tESP, tEBP, tESI, tEDI,
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  tEIP, tEFLAGS, tCS, tSS
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};
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#endif /* No sEAX */
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/* blockend is the value of u.u_ar0, and points to the
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   place where ES is stored.  */
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int
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i386_register_u_addr (blockend, regnum)
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     int blockend;
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     int regnum;
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{
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  /* The following condition is a kludge to get at the proper register map
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     depending upon the state of pcb_flag.
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     The proper condition would be
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     if (u.u_pcb.pcb_flag & FM_TRAP)
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     but that would require a ptrace call here and wouldn't work
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     for corefiles.  */
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  if (blockend < 0x1fcc)
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    return (blockend + 4 * tregmap[regnum]);
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  else
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    return (blockend + 4 * sregmap[regnum]);
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}
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#endif /* !FETCH_INFERIOR_REGISTERS */
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#ifdef FLOAT_INFO
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#include "expression.h"
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#include "language.h"           /* for local_hex_string */
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#include "floatformat.h"
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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141
#include <a.out.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/uio.h>
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#define curpcb Xcurpcb          /* XXX avoid leaking declaration from pcb.h */
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#include <sys/user.h>
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#undef curpcb
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#include <sys/file.h>
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#include "gdb_stat.h"
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#include <sys/ptrace.h>
152
 
153
extern void print_387_control_word ();  /* i387-tdep.h */
154
extern void print_387_status_word ();
155
 
156
#define fpstate         save87
157
#define U_FPSTATE(u)    u.u_pcb.pcb_savefpu
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159
struct env387
160
  {
161
    unsigned short control;
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    unsigned short r0;
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    unsigned short status;
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    unsigned short r1;
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    unsigned short tag;
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    unsigned short r2;
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    unsigned long eip;
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    unsigned short code_seg;
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    unsigned short opcode;
170
    unsigned long operand;
171
    unsigned short operand_seg;
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    unsigned short r3;
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    unsigned char regs[8][10];
174
  };
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176
static void
177
print_387_status (status, ep)
178
     unsigned short status;
179
     struct env387 *ep;
180
{
181
  int i;
182
  int bothstatus;
183
  int top;
184
  int fpreg;
185
 
186
  bothstatus = ((status != 0) && (ep->status != 0));
187
  if (status != 0)
188
    {
189
      if (bothstatus)
190
        printf_unfiltered ("u: ");
191
      print_387_status_word ((unsigned int) status);
192
    }
193
 
194
  if (ep->status != 0)
195
    {
196
      if (bothstatus)
197
        printf_unfiltered ("e: ");
198
      print_387_status_word ((unsigned int) ep->status);
199
    }
200
 
201
  print_387_control_word ((unsigned int) ep->control);
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  printf_unfiltered ("last exception: ");
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  printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
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  printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
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  printf_unfiltered ("%s; ", local_hex_string (ep->eip));
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  printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
207
  printf_unfiltered (":%s\n", local_hex_string (ep->operand));
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209
  top = (ep->status >> 11) & 7;
210
 
211
  printf_unfiltered ("regno     tag  msb              lsb  value\n");
212
  for (fpreg = 7; fpreg >= 0; fpreg--)
213
    {
214
      double val;
215
 
216
      printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
217
 
218
      switch ((ep->tag >> (fpreg * 2)) & 3)
219
        {
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        case 0:
221
          printf_unfiltered ("valid ");
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          break;
223
        case 1:
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          printf_unfiltered ("zero  ");
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          break;
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        case 2:
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          printf_unfiltered ("trap  ");
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          break;
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        case 3:
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          printf_unfiltered ("empty ");
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          break;
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        }
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      for (i = 9; i >= 0; i--)
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        printf_unfiltered ("%02x", ep->regs[fpreg][i]);
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236
      floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
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                             &val);
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      printf_unfiltered ("  %g\n", val);
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    }
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}
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i386_float_info ()
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{
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  struct user u;                /* just for address computations */
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  int i;
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  /* fpstate defined in <sys/user.h> */
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  struct fpstate *fpstatep;
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  char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
249
  unsigned int uaddr;
250
  char fpvalid;
251
  unsigned int rounded_addr;
252
  unsigned int rounded_size;
253
  /*extern int corechan; */
254
  int skip;
255
  extern int inferior_pid;
256
 
257
  uaddr = (char *) &U_FPSTATE (u) - (char *) &u;
258
  if (inferior_pid)
259
    {
260
      int *ip;
261
 
262
      rounded_addr = uaddr & -sizeof (int);
263
      rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
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                      sizeof (int) - 1) / sizeof (int);
265
      skip = uaddr - rounded_addr;
266
 
267
      ip = (int *) buf;
268
      for (i = 0; i < rounded_size; i++)
269
        {
270
          *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t) rounded_addr, 0);
271
          rounded_addr += sizeof (int);
272
        }
273
    }
274
  else
275
    {
276
      printf ("float info: can't do a core file (yet)\n");
277
      return;
278
#if 0
279
      if (lseek (corechan, uaddr, 0) < 0)
280
        perror_with_name ("seek on core file");
281
      if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
282
          perror_with_name ("read from core file");
283
      skip = 0;
284
#endif
285
    }
286
 
287
  print_387_status (0, (struct env387 *) buf);
288
}
289
 
290
int
291
kernel_u_size ()
292
{
293
  return (sizeof (struct user));
294
}
295
 
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#endif

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