gdb/i386aix-nat.c

   1 /* Intel 386 native support.
   2    Copyright 1988, 1989, 1991, 1992, 2001 Free Software Foundation,
   3    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 #include "frame.h"
  24 #include "inferior.h"
  25 #include "language.h"
  26 #include "gdbcore.h"
  27 #include "regcache.h"
  28
  29 #ifdef USG
  30 #include <sys/types.h>
  31 #endif
  32
  33 #include <sys/param.h>
  34 #include <sys/dir.h>
  35 #include <signal.h>
  36 #include <sys/user.h>
  37 #include <sys/ioctl.h>
  38 #include <fcntl.h>
  39
  40 #include <sys/file.h>
  41 #include "gdb_stat.h"
  42
  43 #include <stddef.h>
  44 #include <sys/ptrace.h>
  45
  46 /* Does AIX define this in <errno.h>?  */
  47 extern int errno;
  48
  49 #ifdef HAVE_SYS_REG_H
  50 #include <sys/reg.h>
  51 #endif
  52
  53 #include "floatformat.h"
  54
  55 #include "target.h"
  56
  57 static void fetch_core_registers (char *, unsigned, int, CORE_ADDR);
  58 \f
  59
  60 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
  61 /* symbols like 'EAX' come from <sys/reg.h> */
  62 static int regmap[] =
  63 {
  64   EAX, ECX, EDX, EBX,
  65   USP, EBP, ESI, EDI,
  66   EIP, EFL, CS, SS,
  67   DS, ES, FS, GS,
  68 };
  69
  70 /* blockend is the value of u.u_ar0, and points to the
  71  * place where GS is stored
  72  */
  73
  74 int
  75 i386_register_u_addr (int blockend, 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 (unsigned short status, struct env387 *ep)
 119 {
 120   int i;
 121   int bothstatus;
 122   int top;
 123   int fpreg;
 124   unsigned char *p;
 125
 126   bothstatus = ((status != 0) && (ep->status != 0));
 127   if (status != 0)
 128     {
 129       if (bothstatus)
 130         printf_unfiltered ("u: ");
 131       print_387_status_word (status);
 132     }
 133
 134   if (ep->status != 0)
 135     {
 136       if (bothstatus)
 137         printf_unfiltered ("e: ");
 138       print_387_status_word (ep->status);
 139     }
 140
 141   print_387_control_word (ep->control);
 142   printf_unfiltered ("last exception: ");
 143   printf_unfiltered ("opcode %s; ", local_hex_string (ep->opcode));
 144   printf_unfiltered ("pc %s:", local_hex_string (ep->code_seg));
 145   printf_unfiltered ("%s; ", local_hex_string (ep->eip));
 146   printf_unfiltered ("operand %s", local_hex_string (ep->operand_seg));
 147   printf_unfiltered (":%s\n", local_hex_string (ep->operand));
 148
 149   top = ((ep->status >> 11) & 7);
 150
 151   printf_unfiltered ("regno  tag  msb              lsb  value\n");
 152   for (fpreg = 7; fpreg >= 0; fpreg--)
 153     {
 154       double val;
 155
 156       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 157
 158       switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
 159         {
 160         case 0:
 161           printf_unfiltered ("valid ");
 162           break;
 163         case 1:
 164           printf_unfiltered ("zero  ");
 165           break;
 166         case 2:
 167           printf_unfiltered ("trap  ");
 168           break;
 169         case 3:
 170           printf_unfiltered ("empty ");
 171           break;
 172         }
 173       for (i = 9; i >= 0; i--)
 174         printf_unfiltered ("%02x", ep->regs[fpreg][i]);
 175
 176       i387_to_double ((char *) ep->regs[fpreg], (char *) &val);
 177       printf_unfiltered ("  %#g\n", val);
 178     }
 179 }
 180
 181 static struct env387 core_env387;
 182
 183 void
 184 i386_float_info (void)
 185 {
 186   struct env387 fps;
 187   int fpsaved = 0;
 188   /* We need to reverse the order of the registers.  Apparently AIX stores
 189      the highest-numbered ones first.  */
 190   struct env387 fps_fixed;
 191   int i;
 192
 193   if (inferior_pid)
 194     {
 195       char buf[10];
 196       unsigned short status;
 197
 198       ptrace (PT_READ_FPR, inferior_pid, buf, offsetof (struct env387, status));
 199       memcpy (&status, buf, sizeof (status));
 200       fpsaved = status;
 201     }
 202   else
 203     {
 204       if ((fpsaved = core_env387.status) != 0)
 205         memcpy (&fps, &core_env387, sizeof (fps));
 206     }
 207
 208   if (fpsaved == 0)
 209     {
 210       printf_unfiltered ("no floating point status saved\n");
 211       return;
 212     }
 213
 214   if (inferior_pid)
 215     {
 216       int offset;
 217       for (offset = 0; offset < sizeof (fps); offset += 10)
 218         {
 219           char buf[10];
 220           ptrace (PT_READ_FPR, inferior_pid, buf, offset);
 221           memcpy ((char *) &fps.control + offset, buf,
 222                   MIN (10, sizeof (fps) - offset));
 223         }
 224     }
 225   fps_fixed = fps;
 226   for (i = 0; i < 8; ++i)
 227     memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10);
 228   print_387_status (0, &fps_fixed);
 229 }
 230
 231 /* Fetch one register.  */
 232 static void
 233 fetch_register (int regno)
 234 {
 235   char buf[MAX_REGISTER_RAW_SIZE];
 236   if (regno < FP0_REGNUM)
 237     *(int *) buf = ptrace (PT_READ_GPR, inferior_pid,
 238                            PT_REG (regmap[regno]), 0, 0);
 239   else
 240     ptrace (PT_READ_FPR, inferior_pid, buf,
 241             (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
 242   supply_register (regno, buf);
 243 }
 244
 245 void
 246 fetch_inferior_registers (int regno)
 247 {
 248   if (regno < 0)
 249     for (regno = 0; regno < NUM_REGS; regno++)
 250       fetch_register (regno);
 251   else
 252     fetch_register (regno);
 253 }
 254
 255 /* store one register */
 256 static void
 257 store_register (int regno)
 258 {
 259   char buf[80];
 260   errno = 0;
 261   if (regno < FP0_REGNUM)
 262     ptrace (PT_WRITE_GPR, inferior_pid, PT_REG (regmap[regno]),
 263             *(int *) &registers[REGISTER_BYTE (regno)], 0);
 264   else
 265     ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
 266             (regno - FP0_REGNUM) * 10 + offsetof (struct env387, regs));
 267
 268   if (errno != 0)
 269     {
 270       sprintf (buf, "writing register number %d", regno);
 271       perror_with_name (buf);
 272     }
 273 }
 274
 275 /* Store our register values back into the inferior.
 276    If REGNO is -1, do this for all registers.
 277    Otherwise, REGNO specifies which register (so we can save time).  */
 278 void
 279 store_inferior_registers (int regno)
 280 {
 281   if (regno < 0)
 282     for (regno = 0; regno < NUM_REGS; regno++)
 283       store_register (regno);
 284   else
 285     store_register (regno);
 286 }
 287
 288 #ifndef CD_AX                   /* defined in sys/i386/coredump.h */
 289 #define CD_AX   0
 290 #define CD_BX   1
 291 #define CD_CX   2
 292 #define CD_DX   3
 293 #define CD_SI   4
 294 #define CD_DI   5
 295 #define CD_BP   6
 296 #define CD_SP   7
 297 #define CD_FL   8
 298 #define CD_IP   9
 299 #define CD_CS   10
 300 #define CD_DS   11
 301 #define CD_ES   12
 302 #define CD_FS   13
 303 #define CD_GS   14
 304 #define CD_SS   15
 305 #endif
 306
 307 /*
 308  * The order here in core_regmap[] has to be the same as in
 309  * regmap[] above.
 310  */
 311 static int core_regmap[] =
 312 {
 313   CD_AX, CD_CX, CD_DX, CD_BX,
 314   CD_SP, CD_BP, CD_SI, CD_DI,
 315   CD_IP, CD_FL, CD_CS, CD_SS,
 316   CD_DS, CD_ES, CD_FS, CD_GS,
 317 };
 318
 319 /* Provide registers to GDB from a core file.
 320
 321    CORE_REG_SECT points to an array of bytes, which were obtained from
 322    a core file which BFD thinks might contain register contents.
 323    CORE_REG_SIZE is its size.
 324
 325    WHICH says which register set corelow suspects this is:
 326      0 --- the general-purpose register set
 327      2 --- the floating-point register set
 328
 329    REG_ADDR isn't used.  */
 330
 331 static void
 332 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 333                       int which, CORE_ADDR reg_addr)
 334 {
 335
 336   if (which == 0)
 337     {
 338       /* Integer registers */
 339
 340 #define cd_regs(n) ((int *)core_reg_sect)[n]
 341 #define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
 342
 343       int i;
 344       for (i = 0; i < FP0_REGNUM; i++)
 345         regs (i) = cd_regs (core_regmap[i]);
 346     }
 347   else if (which == 2)
 348     {
 349       /* Floating point registers */
 350
 351       if (core_reg_size >= sizeof (core_env387))
 352         memcpy (&core_env387, core_reg_sect, core_reg_size);
 353       else
 354         fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 355     }
 356 }
 357 \f
 358
 359 /* Register that we are able to handle i386aix core file formats.
 360    FIXME: is this really bfd_target_unknown_flavour? */
 361
 362 static struct core_fns i386aix_core_fns =
 363 {
 364   bfd_target_unknown_flavour,           /* core_flavour */
 365   default_check_format,                 /* check_format */
 366   default_core_sniffer,                 /* core_sniffer */
 367   fetch_core_registers,                 /* core_read_registers */
 368   NULL                                  /* next */
 369 };
 370
 371 void
 372 _initialize_core_i386aix (void)
 373 {
 374   add_core_fns (&i386aix_core_fns);
 375 }