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 (regno)
  33      int regno;
  34 {
  35   struct reg inferior_registers;
  36
  37   ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  38   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
  39   registers_fetched ();
  40 }
  41
  42 void
  43 store_inferior_registers (regno)
  44      int regno;
  45 {
  46   struct reg inferior_registers;
  47
  48   memcpy (&inferior_registers, &registers[REGISTER_BYTE (0)], 4 * NUM_REGS);
  49   ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  50 }
  51
  52 struct md_core
  53 {
  54   struct reg intreg;
  55   struct fpreg freg;
  56 };
  57
  58 void
  59 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
  60      char *core_reg_sect;
  61      unsigned core_reg_size;
  62      int which;
  63      CORE_ADDR ignore;
  64 {
  65   struct md_core *core_reg = (struct md_core *) core_reg_sect;
  66
  67   /* integer registers */
  68   memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
  69           sizeof (struct reg));
  70   /* floating point registers */
  71   /* XXX */
  72 }
  73
  74 #else
  75
  76 #include <machine/reg.h>
  77
  78 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  79 /* symbols like 'tEAX' come from <machine/reg.h> */
  80 static int tregmap[] =
  81 {
  82   tEAX, tECX, tEDX, tEBX,
  83   tESP, tEBP, tESI, tEDI,
  84   tEIP, tEFLAGS, tCS, tSS
  85 };
  86
  87 #ifdef sEAX
  88 static int sregmap[] =
  89 {
  90   sEAX, sECX, sEDX, sEBX,
  91   sESP, sEBP, sESI, sEDI,
  92   sEIP, sEFLAGS, sCS, sSS
  93 };
  94 #else /* No sEAX */
  95
  96 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
  97    ones aren't around, use the t* ones for sregmap too.  */
  98
  99 static int sregmap[] =
 100 {
 101   tEAX, tECX, tEDX, tEBX,
 102   tESP, tEBP, tESI, tEDI,
 103   tEIP, tEFLAGS, tCS, tSS
 104 };
 105 #endif /* No sEAX */
 106
 107 /* blockend is the value of u.u_ar0, and points to the
 108    place where ES is stored.  */
 109
 110 int
 111 i386_register_u_addr (blockend, regnum)
 112      int blockend;
 113      int regnum;
 114 {
 115   /* The following condition is a kludge to get at the proper register map
 116      depending upon the state of pcb_flag.
 117      The proper condition would be
 118      if (u.u_pcb.pcb_flag & FM_TRAP)
 119      but that would require a ptrace call here and wouldn't work
 120      for corefiles.  */
 121
 122   if (blockend < 0x1fcc)
 123     return (blockend + 4 * tregmap[regnum]);
 124   else
 125     return (blockend + 4 * sregmap[regnum]);
 126 }
 127
 128 #endif /* !FETCH_INFERIOR_REGISTERS */
 129
 130 #ifdef FLOAT_INFO
 131 #include "expression.h"
 132 #include "language.h"           /* for local_hex_string */
 133 #include "floatformat.h"
 134
 135 #include <sys/param.h>
 136 #include <sys/dir.h>
 137 #include <signal.h>
 138 #include <sys/ioctl.h>
 139 #include <fcntl.h>
 140
 141 #include <a.out.h>
 142
 143 #include <sys/time.h>
 144 #include <sys/resource.h>
 145 #include <sys/uio.h>
 146 #define curpcb Xcurpcb          /* XXX avoid leaking declaration from pcb.h */
 147 #include <sys/user.h>
 148 #undef curpcb
 149 #include <sys/file.h>
 150 #include "gdb_stat.h"
 151 #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
 158
 159 struct env387
 160   {
 161     unsigned short control;
 162     unsigned short r0;
 163     unsigned short status;
 164     unsigned short r1;
 165     unsigned short tag;
 166     unsigned short r2;
 167     unsigned long eip;
 168     unsigned short code_seg;
 169     unsigned short opcode;
 170     unsigned long operand;
 171     unsigned short operand_seg;
 172     unsigned short r3;
 173     unsigned char regs[8][10];
 174   };
 175
 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);
 202   printf_unfiltered ("last exception: ");
 203   printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
 204   printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
 205   printf_unfiltered ("%s; ", local_hex_string (ep->eip));
 206   printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
 207   printf_unfiltered (":%s\n", local_hex_string (ep->operand));
 208
 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         {
 220         case 0:
 221           printf_unfiltered ("valid ");
 222           break;
 223         case 1:
 224           printf_unfiltered ("zero  ");
 225           break;
 226         case 2:
 227           printf_unfiltered ("trap  ");
 228           break;
 229         case 3:
 230           printf_unfiltered ("empty ");
 231           break;
 232         }
 233       for (i = 9; i >= 0; i--)
 234         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 235
 236       floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
 237                              &val);
 238       printf_unfiltered ("  %g\n", val);
 239     }
 240 }
 241
 242 i386_float_info ()
 243 {
 244   struct user u;                /* just for address computations */
 245   int i;
 246   /* fpstate defined in <sys/user.h> */
 247   struct fpstate *fpstatep;
 248   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) +
 264                       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
 296 #endif