gdb/i386aix-nat.c

   1 /* Intel 386 native support.
   2    Copyright (C) 1988, 1989, 1991, 1992 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 #include "frame.h"
  23 #include "inferior.h"
  24 #include "language.h"
  25 #include "gdbcore.h"
  26
  27 #ifdef USG
  28 #include <sys/types.h>
  29 #endif
  30
  31 #include <sys/param.h>
  32 #include <sys/dir.h>
  33 #include <signal.h>
  34 #include <sys/user.h>
  35 #include <sys/ioctl.h>
  36 #include <fcntl.h>
  37
  38 #include <sys/file.h>
  39 #include "gdb_stat.h"
  40
  41 #include <stddef.h>
  42 #include <sys/ptrace.h>
  43
  44 /* Does AIX define this in <errno.h>?  */
  45 extern int errno;
  46
  47 #ifdef HAVE_SYS_REG_H
  48 #include <sys/reg.h>
  49 #endif
  50
  51 #include "floatformat.h"
  52
  53 #include "target.h"
  54
  55 static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
  56 \f
  57
  58 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
  59 /* symbols like 'EAX' come from <sys/reg.h> */
  60 static int regmap[] =
  61 {
  62   EAX, ECX, EDX, EBX,
  63   USP, EBP, ESI, EDI,
  64   EIP, EFL, CS, SS,
  65   DS, ES, FS, GS,
  66 };
  67
  68 /* blockend is the value of u.u_ar0, and points to the
  69  * place where GS is stored
  70  */
  71
  72 int
  73 i386_register_u_addr (blockend, regnum)
  74      int blockend;
  75      int regnum;
  76 {
  77 #if 0
  78   /* this will be needed if fp registers are reinstated */
  79   /* for now, you can look at them with 'info float'
  80    * sys5 wont let you change them with ptrace anyway
  81    */
  82   if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
  83     {
  84       int ubase, fpstate;
  85       struct user u;
  86       ubase = blockend + 4 * (SS + 1) - KSTKSZ;
  87       fpstate = ubase + ((char *) &u.u_fpstate - (char *) &u);
  88       return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
  89     }
  90   else
  91 #endif
  92     return (blockend + 4 * regmap[regnum]);
  93
  94 }
  95
  96 /* The code below only work on the aix ps/2 (i386-ibm-aix) -
  97  * mtranle@paris - Sat Apr 11 10:34:12 1992
  98  */
  99
 100 struct env387
 101 {
 102   unsigned short control;
 103   unsigned short r0;
 104   unsigned short status;
 105   unsigned short r1;
 106   unsigned short tag;
 107   unsigned short r2;
 108   unsigned long eip;
 109   unsigned short code_seg;
 110   unsigned short opcode;
 111   unsigned long operand;
 112   unsigned short operand_seg;
 113   unsigned short r3;
 114   unsigned char regs[8][10];
 115 };
 116
 117 static
 118 print_387_status (status, ep)
 119      unsigned short status;
 120      struct env387 *ep;
 121 {
 122   int i;
 123   int bothstatus;
 124   int top;
 125   int fpreg;
 126   unsigned char *p;
 127
 128   bothstatus = ((status != 0) && (ep->status != 0));
 129   if (status != 0)
 130     {
 131       if (bothstatus)
 132         printf_unfiltered ("u: ");
 133       print_387_status_word (status);
 134     }
 135
 136   if (ep->status != 0)
 137     {
 138       if (bothstatus)
 139         printf_unfiltered ("e: ");
 140       print_387_status_word (ep->status);
 141     }
 142
 143   print_387_control_word (ep->control);
 144   printf_unfiltered ("last exception: ");
 145   printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
 146   printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
 147   printf_unfiltered ("%s; ", local_hex_string (ep->eip));
 148   printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
 149   printf_unfiltered (":%s\n", local_hex_string (ep->operand));
 150
 151   top = ((ep->status >> 11) & 7);
 152
 153   printf_unfiltered ("regno  tag  msb              lsb  value\n");
 154   for (fpreg = 7; fpreg >= 0; fpreg--)
 155     {
 156       double val;
 157
 158       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 159
 160       switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
 161         {
 162         case 0:
 163           printf_unfiltered ("valid ");
 164           break;
 165         case 1:
 166           printf_unfiltered ("zero  ");
 167           break;
 168         case 2:
 169           printf_unfiltered ("trap  ");
 170           break;
 171         case 3:
 172           printf_unfiltered ("empty ");
 173           break;
 174         }
 175       for (i = 9; i >= 0; i--)
 176         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 177
 178       i387_to_double ((char *) ep->regs[fpreg], (char *) &val);
 179       printf_unfiltered ("  %#g\n", val);
 180     }
 181 }
 182
 183 static struct env387 core_env387;
 184
 185 void
 186 i386_float_info ()
 187 {
 188   struct env387 fps;
 189   int fpsaved = 0;
 190   /* We need to reverse the order of the registers.  Apparently AIX stores
 191      the highest-numbered ones first.  */
 192   struct env387 fps_fixed;
 193   int i;
 194
 195   if (inferior_pid)
 196     {
 197       char buf[10];
 198       unsigned short status;
 199
 200       ptrace (PT_READ_FPR, inferior_pid, buf, offsetof (struct env387, status));
 201       memcpy (&status, buf, sizeof (status));
 202       fpsaved = status;
 203     }
 204   else
 205     {
 206       if ((fpsaved = core_env387.status) != 0)
 207         memcpy (&fps, &core_env387, sizeof (fps));
 208     }
 209
 210   if (fpsaved == 0)
 211     {
 212       printf_unfiltered ("no floating point status saved\n");
 213       return;
 214     }
 215
 216   if (inferior_pid)
 217     {
 218       int offset;
 219       for (offset = 0; offset < sizeof (fps); offset += 10)
 220         {
 221           char buf[10];
 222           ptrace (PT_READ_FPR, inferior_pid, buf, offset);
 223           memcpy ((char *) &fps.control + offset, buf,
 224                   MIN (10, sizeof (fps) - offset));
 225         }
 226     }
 227   fps_fixed = fps;
 228   for (i = 0; i < 8; ++i)
 229     memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
 230   print_387_status (0, &fps_fixed);
 231 }
 232
 233 /* Fetch one register.  */
 234 static void
 235 fetch_register (regno)
 236      int regno;
 237 {
 238   char buf[MAX_REGISTER_RAW_SIZE];
 239   if (regno < FP0_REGNUM)
 240     *(int *) buf = ptrace (PT_READ_GPR, inferior_pid,
 241                            PT_REG (regmap[regno]), 0, 0);
 242   else
 243     ptrace (PT_READ_FPR, inferior_pid, buf,
 244             (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
 245   supply_register (regno, buf);
 246 }
 247
 248 void
 249 fetch_inferior_registers (regno)
 250      int regno;
 251 {
 252   if (regno < 0)
 253     for (regno = 0; regno < NUM_REGS; regno++)
 254       fetch_register (regno);
 255   else
 256     fetch_register (regno);
 257 }
 258
 259 /* store one register */
 260 static void
 261 store_register (regno)
 262      int regno;
 263 {
 264   char buf[80];
 265   errno = 0;
 266   if (regno < FP0_REGNUM)
 267     ptrace (PT_WRITE_GPR, inferior_pid, PT_REG (regmap[regno]),
 268             *(int *) &registers[REGISTER_BYTE (regno)], 0);
 269   else
 270     ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
 271             (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
 272
 273   if (errno != 0)
 274     {
 275       sprintf (buf, "writing register number %d", regno);
 276       perror_with_name (buf);
 277     }
 278 }
 279
 280 /* Store our register values back into the inferior.
 281    If REGNO is -1, do this for all registers.
 282    Otherwise, REGNO specifies which register (so we can save time).  */
 283 void
 284 store_inferior_registers (regno)
 285      int regno;
 286 {
 287   if (regno < 0)
 288     for (regno = 0; regno < NUM_REGS; regno++)
 289       store_register (regno);
 290   else
 291     store_register (regno);
 292 }
 293
 294 #ifndef CD_AX                   /* defined in sys/i386/coredump.h */
 295 #define CD_AX   0
 296 #define CD_BX   1
 297 #define CD_CX   2
 298 #define CD_DX   3
 299 #define CD_SI   4
 300 #define CD_DI   5
 301 #define CD_BP   6
 302 #define CD_SP   7
 303 #define CD_FL   8
 304 #define CD_IP   9
 305 #define CD_CS   10
 306 #define CD_DS   11
 307 #define CD_ES   12
 308 #define CD_FS   13
 309 #define CD_GS   14
 310 #define CD_SS   15
 311 #endif
 312
 313 /*
 314  * The order here in core_regmap[] has to be the same as in
 315  * regmap[] above.
 316  */
 317 static int core_regmap[] =
 318 {
 319   CD_AX, CD_CX, CD_DX, CD_BX,
 320   CD_SP, CD_BP, CD_SI, CD_DI,
 321   CD_IP, CD_FL, CD_CS, CD_SS,
 322   CD_DS, CD_ES, CD_FS, CD_GS,
 323 };
 324
 325 static void
 326 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 327      char *core_reg_sect;
 328      unsigned core_reg_size;
 329      int which;
 330      CORE_ADDR reg_addr;        /* ignored */
 331 {
 332
 333   if (which == 0)
 334     {
 335       /* Integer registers */
 336
 337 #define cd_regs(n) ((int *)core_reg_sect)[n]
 338 #define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
 339
 340       int i;
 341       for (i = 0; i < FP0_REGNUM; i++)
 342         regs (i) = cd_regs (core_regmap[i]);
 343     }
 344   else if (which == 2)
 345     {
 346       /* Floating point registers */
 347
 348       if (core_reg_size >= sizeof (core_env387))
 349         memcpy (&core_env387, core_reg_sect, core_reg_size);
 350       else
 351         fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 352     }
 353 }
 354 \f
 355
 356 /* Register that we are able to handle i386aix core file formats.
 357    FIXME: is this really bfd_target_unknown_flavour? */
 358
 359 static struct core_fns i386aix_core_fns =
 360 {
 361   bfd_target_unknown_flavour,
 362   fetch_core_registers,
 363   NULL
 364 };
 365
 366 void
 367 _initialize_core_i386aix ()
 368 {
 369   add_core_fns (&i386aix_core_fns);
 370 }