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