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, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21
  22 #ifdef FETCH_INFERIOR_REGISTERS
  23 #include <sys/types.h>
  24 #include <sys/ptrace.h>
  25 #include <machine/reg.h>
  26 #include <machine/frame.h>
  27 #include "inferior.h"
  28
  29 void
  30 fetch_inferior_registers(regno)
  31      int regno;
  32 {
  33   struct reg inferior_registers;
  34
  35   ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &inferior_registers, 0);
  36   memcpy (&registers[REGISTER_BYTE (0)], &inferior_registers, 4*NUM_REGS);
  37   registers_fetched ();
  38 }
  39
  40 void
  41 store_inferior_registers(regno)
  42      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   struct reg intreg;
  52   struct fpreg freg;
  53 };
  54
  55 void
  56 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
  57      char *core_reg_sect;
  58      unsigned core_reg_size;
  59      int which;
  60      unsigned int 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 static int sregmap[] =
  85 {
  86   sEAX, sECX, sEDX, sEBX,
  87   sESP, sEBP, sESI, sEDI,
  88   sEIP, sEFLAGS, sCS, sSS
  89 };
  90
  91 /* blockend is the value of u.u_ar0, and points to the
  92    place where ES is stored.  */
  93
  94 int
  95 i386_register_u_addr (blockend, regnum)
  96      int blockend;
  97      int regnum;
  98 {
  99   /* The following condition is a kludge to get at the proper register map
 100      depending upon the state of pcb_flag.
 101      The proper condition would be
 102      if (u.u_pcb.pcb_flag & FM_TRAP)
 103      but that would require a ptrace call here and wouldn't work
 104      for corefiles.  */
 105
 106   if (blockend < 0x1fcc)
 107     return (blockend + 4 * tregmap[regnum]);
 108   else
 109     return (blockend + 4 * sregmap[regnum]);
 110 }
 111
 112 #endif /* !FETCH_INFERIOR_REGISTERS */
 113
 114 #ifdef FLOAT_INFO
 115 #include "language.h"                   /* for local_hex_string */
 116 #include "floatformat.h"
 117
 118 #include <sys/param.h>
 119 #include <sys/dir.h>
 120 #include <signal.h>
 121 #include <sys/ioctl.h>
 122 #include <fcntl.h>
 123
 124 #include <a.out.h>
 125
 126 #include <sys/time.h>
 127 #include <sys/resource.h>
 128 #include <sys/uio.h>
 129 #define curpcb Xcurpcb  /* XXX avoid leaking declaration from pcb.h */
 130 #include <sys/user.h>
 131 #undef curpcb
 132 #include <sys/file.h>
 133 #include "gdb_stat.h"
 134 #include <sys/ptrace.h>
 135
 136 extern void print_387_control_word ();          /* i387-tdep.h */
 137 extern void print_387_status_word ();
 138
 139 #define fpstate         save87
 140 #define U_FPSTATE(u)    u.u_pcb.pcb_savefpu
 141
 142 struct env387
 143 {
 144   unsigned short control;
 145   unsigned short r0;
 146   unsigned short status;
 147   unsigned short r1;
 148   unsigned short tag;
 149   unsigned short r2;
 150   unsigned long eip;
 151   unsigned short code_seg;
 152   unsigned short opcode;
 153   unsigned long operand;
 154   unsigned short operand_seg;
 155   unsigned short r3;
 156   unsigned char regs[8][10];
 157 };
 158
 159 static void
 160 print_387_status (status, ep)
 161      unsigned short status;
 162      struct env387 *ep;
 163 {
 164   int i;
 165   int bothstatus;
 166   int top;
 167   int fpreg;
 168
 169   bothstatus = ((status != 0) && (ep->status != 0));
 170   if (status != 0)
 171     {
 172       if (bothstatus)
 173         printf_unfiltered ("u: ");
 174       print_387_status_word ((unsigned int)status);
 175     }
 176
 177   if (ep->status != 0)
 178     {
 179       if (bothstatus)
 180         printf_unfiltered ("e: ");
 181       print_387_status_word ((unsigned int)ep->status);
 182     }
 183
 184   print_387_control_word ((unsigned int)ep->control);
 185   printf_unfiltered ("last exception: ");
 186   printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
 187   printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
 188   printf_unfiltered ("%s; ", local_hex_string(ep->eip));
 189   printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
 190   printf_unfiltered (":%s\n", local_hex_string(ep->operand));
 191
 192   top = (ep->status >> 11) & 7;
 193
 194   printf_unfiltered ("regno     tag  msb              lsb  value\n");
 195   for (fpreg = 7; fpreg >= 0; fpreg--)
 196     {
 197       double val;
 198
 199       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 200
 201       switch ((ep->tag >> (fpreg * 2)) & 3)
 202         {
 203         case 0: printf_unfiltered ("valid "); break;
 204         case 1: printf_unfiltered ("zero  "); break;
 205         case 2: printf_unfiltered ("trap  "); break;
 206         case 3: printf_unfiltered ("empty "); break;
 207         }
 208       for (i = 9; i >= 0; i--)
 209         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 210
 211       floatformat_to_double(&floatformat_i387_ext, (char *) ep->regs[fpreg],
 212                               &val);
 213       printf_unfiltered ("  %g\n", val);
 214     }
 215 }
 216
 217 i386_float_info ()
 218 {
 219   struct user u; /* just for address computations */
 220   int i;
 221   /* fpstate defined in <sys/user.h> */
 222   struct fpstate *fpstatep;
 223   char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
 224   unsigned int uaddr;
 225   char fpvalid;
 226   unsigned int rounded_addr;
 227   unsigned int rounded_size;
 228   /*extern int corechan;*/
 229   int skip;
 230   extern int inferior_pid;
 231
 232   uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
 233   if (inferior_pid)
 234     {
 235       int *ip;
 236
 237       rounded_addr = uaddr & -sizeof (int);
 238       rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
 239                       sizeof (int) - 1) / sizeof (int);
 240       skip = uaddr - rounded_addr;
 241
 242       ip = (int *)buf;
 243       for (i = 0; i < rounded_size; i++)
 244         {
 245           *ip++ = ptrace (PT_READ_U, inferior_pid, (caddr_t)rounded_addr, 0);
 246           rounded_addr += sizeof (int);
 247         }
 248     }
 249   else
 250     {
 251       printf("float info: can't do a core file (yet)\n");
 252       return;
 253 #if 0
 254       if (lseek (corechan, uaddr, 0) < 0)
 255         perror_with_name ("seek on core file");
 256       if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
 257         perror_with_name ("read from core file");
 258       skip = 0;
 259 #endif
 260     }
 261
 262   print_387_status (0, (struct env387 *)buf);
 263 }
 264
 265 int
 266 kernel_u_size ()
 267 {
 268   return (sizeof (struct user));
 269 }
 270
 271 #endif