gdb/i386b-nat.c

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