gdb/i386b-nat.c

   1 /* Native-dependent code for BSD Unix running on i386's, for GDB.
   2    Copyright 1988, 1989, 1991, 1992, 1994, 1995, 1996, 1998, 1999, 2000,
   3    2001 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23
  24 #ifdef FETCH_INFERIOR_REGISTERS
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28 #include <machine/frame.h>
  29 #include "inferior.h"
  30 #include "gdbcore.h" /* for registers_fetched() */
  31 #include "regcache.h"
  32
  33 void
  34 fetch_inferior_registers (int regno)
  35 {
  36   struct reg inferior_registers;
  37
  38   ptrace (PT_GETREGS, PIDGET (inferior_ptid),
  39           (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  40   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
  41   registers_fetched ();
  42 }
  43
  44 void
  45 store_inferior_registers (int regno)
  46 {
  47   struct reg inferior_registers;
  48
  49   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
  50   ptrace (PT_SETREGS, PIDGET (inferior_ptid),
  51           (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  52 }
  53
  54 struct md_core
  55 {
  56   struct reg intreg;
  57   struct fpreg freg;
  58 };
  59
  60 void
  61 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
  62                       CORE_ADDR ignore)
  63 {
  64   struct md_core *core_reg = (struct md_core *) core_reg_sect;
  65
  66   /* integer registers */
  67   memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
  68           sizeof (struct reg));
  69   /* floating point registers */
  70   /* XXX */
  71 }
  72
  73 #else
  74
  75 #include <machine/reg.h>
  76
  77 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  78 /* symbols like 'tEAX' come from <machine/reg.h> */
  79 static int tregmap[] =
  80 {
  81   tEAX, tECX, tEDX, tEBX,
  82   tESP, tEBP, tESI, tEDI,
  83   tEIP, tEFLAGS, tCS, tSS
  84 };
  85
  86 #ifdef sEAX
  87 static int sregmap[] =
  88 {
  89   sEAX, sECX, sEDX, sEBX,
  90   sESP, sEBP, sESI, sEDI,
  91   sEIP, sEFLAGS, sCS, sSS
  92 };
  93 #else /* No sEAX */
  94
  95 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
  96    ones aren't around, use the t* ones for sregmap too.  */
  97
  98 static int sregmap[] =
  99 {
 100   tEAX, tECX, tEDX, tEBX,
 101   tESP, tEBP, tESI, tEDI,
 102   tEIP, tEFLAGS, tCS, tSS
 103 };
 104 #endif /* No sEAX */
 105
 106 /* blockend is the value of u.u_ar0, and points to the
 107    place where ES is stored.  */
 108
 109 int
 110 i386_register_u_addr (int blockend, int regnum)
 111 {
 112   /* The following condition is a kludge to get at the proper register map
 113      depending upon the state of pcb_flag.
 114      The proper condition would be
 115      if (u.u_pcb.pcb_flag & FM_TRAP)
 116      but that would require a ptrace call here and wouldn't work
 117      for corefiles.  */
 118
 119   if (blockend < 0x1fcc)
 120     return (blockend + 4 * tregmap[regnum]);
 121   else
 122     return (blockend + 4 * sregmap[regnum]);
 123 }
 124
 125 #endif /* !FETCH_INFERIOR_REGISTERS */
 126
 127 #ifdef FLOAT_INFO
 128 #include "expression.h"
 129 #include "language.h"           /* for local_hex_string */
 130 #include "floatformat.h"
 131
 132 #include <sys/param.h>
 133 #include <sys/dir.h>
 134 #include <signal.h>
 135 #include <sys/ioctl.h>
 136 #include <fcntl.h>
 137
 138 #include <a.out.h>
 139
 140 #include <sys/time.h>
 141 #include <sys/resource.h>
 142 #include <sys/uio.h>
 143 #define curpcb Xcurpcb          /* XXX avoid leaking declaration from pcb.h */
 144 #include <sys/user.h>
 145 #undef curpcb
 146 #include <sys/file.h>
 147 #include "gdb_stat.h"
 148 #include <sys/ptrace.h>
 149
 150 extern void print_387_control_word ();  /* i387-tdep.h */
 151 extern void print_387_status_word ();
 152
 153 #define fpstate         save87
 154 #define U_FPSTATE(u)    u.u_pcb.pcb_savefpu
 155
 156 struct env387
 157   {
 158     unsigned short control;
 159     unsigned short r0;
 160     unsigned short status;
 161     unsigned short r1;
 162     unsigned short tag;
 163     unsigned short r2;
 164     unsigned long eip;
 165     unsigned short code_seg;
 166     unsigned short opcode;
 167     unsigned long operand;
 168     unsigned short operand_seg;
 169     unsigned short r3;
 170     unsigned char regs[8][10];
 171   };
 172
 173 static void
 174 print_387_status (unsigned short status, struct env387 *ep)
 175 {
 176   int i;
 177   int bothstatus;
 178   int top;
 179   int fpreg;
 180
 181   bothstatus = ((status != 0) && (ep->status != 0));
 182   if (status != 0)
 183     {
 184       if (bothstatus)
 185         printf_unfiltered ("u: ");
 186       print_387_status_word ((unsigned int) status);
 187     }
 188
 189   if (ep->status != 0)
 190     {
 191       if (bothstatus)
 192         printf_unfiltered ("e: ");
 193       print_387_status_word ((unsigned int) ep->status);
 194     }
 195
 196   print_387_control_word ((unsigned int) ep->control);
 197   printf_unfiltered ("last exception: ");
 198   printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
 199   printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
 200   printf_unfiltered ("%s; ", local_hex_string (ep->eip));
 201   printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
 202   printf_unfiltered (":%s\n", local_hex_string (ep->operand));
 203
 204   top = (ep->status >> 11) & 7;
 205
 206   printf_unfiltered ("regno     tag  msb              lsb  value\n");
 207   for (fpreg = 7; fpreg >= 0; fpreg--)
 208     {
 209       double val;
 210
 211       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 212
 213       switch ((ep->tag >> (fpreg * 2)) & 3)
 214         {
 215         case 0:
 216           printf_unfiltered ("valid ");
 217           break;
 218         case 1:
 219           printf_unfiltered ("zero  ");
 220           break;
 221         case 2:
 222           printf_unfiltered ("trap  ");
 223           break;
 224         case 3:
 225           printf_unfiltered ("empty ");
 226           break;
 227         }
 228       for (i = 9; i >= 0; i--)
 229         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 230
 231       floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
 232                              &val);
 233       printf_unfiltered ("  %g\n", val);
 234     }
 235 }
 236
 237 i386_float_info (void)
 238 {
 239   struct user u;                /* just for address computations */
 240   int i;
 241   /* fpstate defined in <sys/user.h> */
 242   struct fpstate *fpstatep;
 243   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
 244   unsigned int uaddr;
 245   char fpvalid;
 246   unsigned int rounded_addr;
 247   unsigned int rounded_size;
 248   /*extern int corechan; */
 249   int skip;
 250
 251   uaddr = (char *) &U_FPSTATE (u) - (char *) &u;
 252   if (! ptid_equal (inferior_ptid, null_ptid))
 253     {
 254       int *ip;
 255
 256       rounded_addr = uaddr & -sizeof (int);
 257       rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
 258                       sizeof (int) - 1) / sizeof (int);
 259       skip = uaddr - rounded_addr;
 260
 261       ip = (int *) buf;
 262       for (i = 0; i < rounded_size; i++)
 263         {
 264           *ip++ = ptrace (PT_READ_U, PIDGET (inferior_ptid),
 265                           (caddr_t) rounded_addr, 0);
 266           rounded_addr += sizeof (int);
 267         }
 268     }
 269   else
 270     {
 271       printf ("float info: can't do a core file (yet)\n");
 272       return;
 273 #if 0
 274       if (lseek (corechan, uaddr, 0) < 0)
 275         perror_with_name ("seek on core file");
 276       if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
 277           perror_with_name ("read from core file");
 278       skip = 0;
 279 #endif
 280     }
 281
 282   print_387_status (0, (struct env387 *) buf);
 283 }
 284
 285 int
 286 kernel_u_size (void)
 287 {
 288   return (sizeof (struct user));
 289 }
 290
 291 #endif