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, 2001 Free Software
   3    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, inferior_pid, (PTRACE_ARG3_TYPE) & inferior_registers, 0);
  39   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4 * NUM_REGS);
  40   registers_fetched ();
  41 }
  42
  43 void
  44 store_inferior_registers (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 (char *core_reg_sect, unsigned core_reg_size, int which,
  60                       CORE_ADDR ignore)
  61 {
  62   struct md_core *core_reg = (struct md_core *) core_reg_sect;
  63
  64   /* integer registers */
  65   memcpy (&registers[REGISTER_BYTE (0)], &core_reg->intreg,
  66           sizeof (struct reg));
  67   /* floating point registers */
  68   /* XXX */
  69 }
  70
  71 #else
  72
  73 #include <machine/reg.h>
  74
  75 /* this table must line up with REGISTER_NAMES in tm-i386.h */
  76 /* symbols like 'tEAX' come from <machine/reg.h> */
  77 static int tregmap[] =
  78 {
  79   tEAX, tECX, tEDX, tEBX,
  80   tESP, tEBP, tESI, tEDI,
  81   tEIP, tEFLAGS, tCS, tSS
  82 };
  83
  84 #ifdef sEAX
  85 static int sregmap[] =
  86 {
  87   sEAX, sECX, sEDX, sEBX,
  88   sESP, sEBP, sESI, sEDI,
  89   sEIP, sEFLAGS, sCS, sSS
  90 };
  91 #else /* No sEAX */
  92
  93 /* FreeBSD has decided to collapse the s* and t* symbols.  So if the s*
  94    ones aren't around, use the t* ones for sregmap too.  */
  95
  96 static int sregmap[] =
  97 {
  98   tEAX, tECX, tEDX, tEBX,
  99   tESP, tEBP, tESI, tEDI,
 100   tEIP, tEFLAGS, tCS, tSS
 101 };
 102 #endif /* No sEAX */
 103
 104 /* blockend is the value of u.u_ar0, and points to the
 105    place where ES is stored.  */
 106
 107 int
 108 i386_register_u_addr (int blockend, int regnum)
 109 {
 110   /* The following condition is a kludge to get at the proper register map
 111      depending upon the state of pcb_flag.
 112      The proper condition would be
 113      if (u.u_pcb.pcb_flag & FM_TRAP)
 114      but that would require a ptrace call here and wouldn't work
 115      for corefiles.  */
 116
 117   if (blockend < 0x1fcc)
 118     return (blockend + 4 * tregmap[regnum]);
 119   else
 120     return (blockend + 4 * sregmap[regnum]);
 121 }
 122
 123 #endif /* !FETCH_INFERIOR_REGISTERS */
 124
 125 #ifdef FLOAT_INFO
 126 #include "expression.h"
 127 #include "language.h"           /* for local_hex_string */
 128 #include "floatformat.h"
 129
 130 #include <sys/param.h>
 131 #include <sys/dir.h>
 132 #include <signal.h>
 133 #include <sys/ioctl.h>
 134 #include <fcntl.h>
 135
 136 #include <a.out.h>
 137
 138 #include <sys/time.h>
 139 #include <sys/resource.h>
 140 #include <sys/uio.h>
 141 #define curpcb Xcurpcb          /* XXX avoid leaking declaration from pcb.h */
 142 #include <sys/user.h>
 143 #undef curpcb
 144 #include <sys/file.h>
 145 #include "gdb_stat.h"
 146 #include <sys/ptrace.h>
 147
 148 extern void print_387_control_word ();  /* i387-tdep.h */
 149 extern void print_387_status_word ();
 150
 151 #define fpstate         save87
 152 #define U_FPSTATE(u)    u.u_pcb.pcb_savefpu
 153
 154 struct env387
 155   {
 156     unsigned short control;
 157     unsigned short r0;
 158     unsigned short status;
 159     unsigned short r1;
 160     unsigned short tag;
 161     unsigned short r2;
 162     unsigned long eip;
 163     unsigned short code_seg;
 164     unsigned short opcode;
 165     unsigned long operand;
 166     unsigned short operand_seg;
 167     unsigned short r3;
 168     unsigned char regs[8][10];
 169   };
 170
 171 static void
 172 print_387_status (unsigned short status, struct env387 *ep)
 173 {
 174   int i;
 175   int bothstatus;
 176   int top;
 177   int fpreg;
 178
 179   bothstatus = ((status != 0) && (ep->status != 0));
 180   if (status != 0)
 181     {
 182       if (bothstatus)
 183         printf_unfiltered ("u: ");
 184       print_387_status_word ((unsigned int) status);
 185     }
 186
 187   if (ep->status != 0)
 188     {
 189       if (bothstatus)
 190         printf_unfiltered ("e: ");
 191       print_387_status_word ((unsigned int) ep->status);
 192     }
 193
 194   print_387_control_word ((unsigned int) ep->control);
 195   printf_unfiltered ("last exception: ");
 196   printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
 197   printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
 198   printf_unfiltered ("%s; ", local_hex_string (ep->eip));
 199   printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
 200   printf_unfiltered (":%s\n", local_hex_string (ep->operand));
 201
 202   top = (ep->status >> 11) & 7;
 203
 204   printf_unfiltered ("regno     tag  msb              lsb  value\n");
 205   for (fpreg = 7; fpreg >= 0; fpreg--)
 206     {
 207       double val;
 208
 209       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 210
 211       switch ((ep->tag >> (fpreg * 2)) & 3)
 212         {
 213         case 0:
 214           printf_unfiltered ("valid ");
 215           break;
 216         case 1:
 217           printf_unfiltered ("zero  ");
 218           break;
 219         case 2:
 220           printf_unfiltered ("trap  ");
 221           break;
 222         case 3:
 223           printf_unfiltered ("empty ");
 224           break;
 225         }
 226       for (i = 9; i >= 0; i--)
 227         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 228
 229       floatformat_to_double (&floatformat_i387_ext, (char *) ep->regs[fpreg],
 230                              &val);
 231       printf_unfiltered ("  %g\n", val);
 232     }
 233 }
 234
 235 i386_float_info (void)
 236 {
 237   struct user u;                /* just for address computations */
 238   int i;
 239   /* fpstate defined in <sys/user.h> */
 240   struct fpstate *fpstatep;
 241   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
 242   unsigned int uaddr;
 243   char fpvalid;
 244   unsigned int rounded_addr;
 245   unsigned int rounded_size;
 246   /*extern int corechan; */
 247   int skip;
 248   extern int inferior_pid;
 249
 250   uaddr = (char *) &U_FPSTATE (u) - (char *) &u;
 251   if (inferior_pid)
 252     {
 253       int *ip;
 254
 255       rounded_addr = uaddr & -sizeof (int);
 256       rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
 257                       sizeof (int) - 1) / sizeof (int);
 258       skip = uaddr - rounded_addr;
 259
 260       ip = (int *) buf;
 261       for (i = 0; i < rounded_size; i++)
 262         {
 263           *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t) rounded_addr, 0);
 264           rounded_addr += sizeof (int);
 265         }
 266     }
 267   else
 268     {
 269       printf ("float info: can't do a core file (yet)\n");
 270       return;
 271 #if 0
 272       if (lseek (corechan, uaddr, 0) < 0)
 273         perror_with_name ("seek on core file");
 274       if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
 275           perror_with_name ("read from core file");
 276       skip = 0;
 277 #endif
 278     }
 279
 280   print_387_status (0, (struct env387 *) buf);
 281 }
 282
 283 int
 284 kernel_u_size (void)
 285 {
 286   return (sizeof (struct user));
 287 }
 288
 289 #endif