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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "language.h"
  24 #include "gdbcore.h"
  25
  26 #ifdef USG
  27 #include <sys/types.h>
  28 #endif
  29
  30 #include <sys/param.h>
  31 #include <sys/dir.h>
  32 #include <signal.h>
  33 #include <sys/user.h>
  34 #include <sys/ioctl.h>
  35 #include <fcntl.h>
  36
  37 #include <sys/file.h>
  38 #include <sys/stat.h>
  39
  40 #include <stddef.h>
  41 #include <sys/ptrace.h>
  42
  43 /* Does AIX define this in <errno.h>?  */
  44 extern int errno;
  45
  46 #ifndef NO_SYS_REG_H
  47 #include <sys/reg.h>
  48 #endif
  49
  50 #include "ieee-float.h"
  51
  52 #include "target.h"
  53
  54 extern struct ext_format ext_format_i387;
  55 \f
  56 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
  57 /* symbols like 'EAX' come from <sys/reg.h> */
  58 static int regmap[] =
  59 {
  60   EAX, ECX, EDX, EBX,
  61   USP, EBP, ESI, EDI,
  62   EIP, EFL, CS, SS,
  63   DS, ES, FS, GS,
  64 };
  65
  66 /* blockend is the value of u.u_ar0, and points to the
  67  * place where GS is stored
  68  */
  69
  70 int
  71 i386_register_u_addr (blockend, regnum)
  72      int blockend;
  73      int regnum;
  74 {
  75 #if 0
  76   /* this will be needed if fp registers are reinstated */
  77   /* for now, you can look at them with 'info float'
  78    * sys5 wont let you change them with ptrace anyway
  79    */
  80   if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
  81     {
  82       int ubase, fpstate;
  83       struct user u;
  84       ubase = blockend + 4 * (SS + 1) - KSTKSZ;
  85       fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
  86       return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
  87     }
  88   else
  89 #endif
  90     return (blockend + 4 * regmap[regnum]);
  91
  92 }
  93
  94 /* The code below only work on the aix ps/2 (i386-ibm-aix) -
  95  * mtranle@paris - Sat Apr 11 10:34:12 1992
  96  */
  97
  98 struct env387
  99 {
 100   unsigned short control;
 101   unsigned short r0;
 102   unsigned short status;
 103   unsigned short r1;
 104   unsigned short tag;
 105   unsigned short r2;
 106   unsigned long eip;
 107   unsigned short code_seg;
 108   unsigned short opcode;
 109   unsigned long operand;
 110   unsigned short operand_seg;
 111   unsigned short r3;
 112   unsigned char regs[8][10];
 113 };
 114
 115 static
 116 print_387_status (status, ep)
 117      unsigned short status;
 118      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 ("u: ");
 131       print_387_status_word (status);
 132     }
 133
 134   if (ep->status != 0)
 135     {
 136       if (bothstatus)
 137         printf ("e: ");
 138       print_387_status_word (ep->status);
 139     }
 140
 141   print_387_control_word (ep->control);
 142   printf ("last exception: ");
 143   printf ("opcode %s; ", local_hex_string(ep->opcode));
 144   printf ("pc %s:", local_hex_string(ep->code_seg));
 145   printf ("%s; ", local_hex_string(ep->eip));
 146   printf ("operand %s", local_hex_string(ep->operand_seg));
 147   printf (":%s\n", local_hex_string(ep->operand));
 148
 149   top = 7- ((ep->status >> 11) & 7);
 150
 151   printf ("regno  tag  msb              lsb  value\n");
 152   for (fpreg = 7; fpreg >= 0; fpreg--)
 153     {
 154       double val;
 155
 156       printf ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 157
 158       switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
 159         {
 160         case 0: printf ("valid "); break;
 161         case 1: printf ("zero  "); break;
 162         case 2: printf ("trap  "); break;
 163         case 3: printf ("empty "); break;
 164         }
 165       for (i = 9; i >= 0; i--)
 166         printf ("%02x", ep->regs[fpreg][i]);
 167
 168       i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
 169       printf ("  %#g\n", val);
 170     }
 171 }
 172
 173 static struct env387 core_env387;
 174
 175 void
 176 i386_float_info ()
 177 {
 178   struct env387 fps;
 179   int fpsaved = 0;
 180
 181   if (inferior_pid)
 182     {
 183       char buf[10];
 184       unsigned short status;
 185
 186       ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
 187       memcpy (&status, buf, sizeof (status));
 188       fpsaved = status;
 189     }
 190   else
 191     {
 192       if ((fpsaved = core_env387.status) != 0)
 193         memcpy(&fps, &core_env387, sizeof(fps));
 194     }
 195
 196   if (fpsaved == 0)
 197     {
 198       printf ("no floating point status saved\n");
 199       return;
 200     }
 201
 202   if (inferior_pid)
 203     {
 204       int offset;
 205       for (offset = 0; offset < sizeof(fps); offset += 10)
 206         {
 207           char buf[10];
 208           ptrace (PT_READ_FPR, inferior_pid, buf, offset);
 209           memcpy ((char *)&fps.control + offset, buf,
 210                   MIN(10, sizeof(fps) - offset));
 211         }
 212     }
 213
 214   print_387_status (0, (struct env387 *)&fps);
 215 }
 216
 217 /* Fetch one register.  */
 218 static void
 219 fetch_register (regno)
 220      int regno;
 221 {
 222   char buf[MAX_REGISTER_RAW_SIZE];
 223   if (regno < FP0_REGNUM)
 224     *(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
 225                           PT_REG(regmap[regno]), 0, 0);
 226   else
 227     ptrace (PT_READ_FPR, inferior_pid, buf,
 228             (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
 229   supply_register (regno, buf);
 230 }
 231
 232 void
 233 fetch_inferior_registers (regno)
 234      int regno;
 235 {
 236   if (regno < 0)
 237     for (regno = 0; regno < NUM_REGS; regno++)
 238       fetch_register (regno);
 239   else
 240     fetch_register (regno);
 241 }
 242
 243 /* store one register */
 244 static void
 245 store_register (regno)
 246      int regno;
 247 {
 248   char buf[80];
 249   extern char registers[];
 250   errno = 0;
 251   if (regno < FP0_REGNUM)
 252     ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
 253             *(int *) &registers[REGISTER_BYTE (regno)], 0);
 254   else
 255     ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
 256             (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
 257
 258   if (errno != 0)
 259     {
 260       sprintf (buf, "writing register number %d", regno);
 261       perror_with_name (buf);
 262     }
 263 }
 264
 265 /* Store our register values back into the inferior.
 266    If REGNO is -1, do this for all registers.
 267    Otherwise, REGNO specifies which register (so we can save time).  */
 268 void
 269 store_inferior_registers (regno)
 270      int regno;
 271 {
 272   if (regno < 0)
 273     for (regno = 0; regno < NUM_REGS; regno++)
 274       store_register (regno);
 275   else
 276     store_register (regno);
 277 }
 278
 279 #ifndef CD_AX                   /* defined in sys/i386/coredump.h */
 280 # define CD_AX  0
 281 # define CD_BX  1
 282 # define CD_CX  2
 283 # define CD_DX  3
 284 # define CD_SI  4
 285 # define CD_DI  5
 286 # define CD_BP  6
 287 # define CD_SP  7
 288 # define CD_FL  8
 289 # define CD_IP  9
 290 # define CD_CS  10
 291 # define CD_DS  11
 292 # define CD_ES  12
 293 # define CD_FS  13
 294 # define CD_GS  14
 295 # define CD_SS  15
 296 #endif
 297
 298 /*
 299  * The order here in core_regmap[] has to be the same as in
 300  * regmap[] above.
 301  */
 302 static int core_regmap[] =
 303 {
 304   CD_AX, CD_CX, CD_DX, CD_BX,
 305   CD_SP, CD_BP, CD_SI, CD_DI,
 306   CD_IP, CD_FL, CD_CS, CD_SS,
 307   CD_DS, CD_ES, CD_FS, CD_GS,
 308 };
 309
 310 void
 311 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 312      char *core_reg_sect;
 313      unsigned core_reg_size;
 314      int which;
 315      unsigned int reg_addr;     /* ignored */
 316 {
 317
 318   if (which == 0)
 319     {
 320       /* Integer registers */
 321
 322 #define cd_regs(n) ((int *)core_reg_sect)[n]
 323 #define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
 324
 325       int i;
 326       for (i = 0; i < FP0_REGNUM; i++)
 327         regs(i) = cd_regs(core_regmap[i]);
 328     }
 329   else if (which == 2)
 330     {
 331       /* Floating point registers */
 332
 333       if (core_reg_size >= sizeof (core_env387))
 334         memcpy (&core_env387, core_reg_sect, core_reg_size);
 335       else
 336         fprintf (stderr, "Couldn't read float regs from core file\n");
 337     }
 338 }