gdb/m88k-xdep.c

   1 /* Host-dependent Motorola 88xxx support for GDB, the GNU Debugger.
   2    Copyright 1988, 1990, 1991 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
  24 #ifdef USG
  25 #include <sys/types.h>
  26 #endif
  27
  28 #include <sys/param.h>
  29 #include <sys/dir.h>
  30 #include <signal.h>
  31 #include "gdbcore.h"
  32 #include <sys/user.h>
  33
  34 #ifndef USER                    /* added to support BCS ptrace_user */
  35 #define USER ptrace_user
  36 #endif
  37 #include <sys/ioctl.h>
  38 #include <fcntl.h>
  39 #include <sys/file.h>
  40 #include <sys/stat.h>
  41
  42 #include "symtab.h"
  43 #include "setjmp.h"
  44 #include "value.h"
  45
  46 #ifdef DELTA88
  47 #include <sys/ptrace.h>
  48
  49 /* define offsets to the pc instruction offsets in ptrace_user struct */
  50 #define SXIP_OFFSET (char *)&u.pt_sigframe.sig_sxip - (char *)&u
  51 #define SNIP_OFFSET (char *)&u.pt_sigframe.sig_snip - (char *)&u
  52 #define SFIP_OFFSET (char *)&u.pt_sigframe.sig_sfip - (char *)&u
  53 #else
  54 /* define offsets to the pc instruction offsets in ptrace_user struct */
  55 #define SXIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_sxip - (char *)&u
  56 #define SNIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_snip - (char *)&u
  57 #define SFIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u
  58 #endif
  59
  60 extern int have_symbol_file_p();
  61
  62 extern jmp_buf stack_jmp;
  63
  64 extern int errno;
  65 extern char registers[REGISTER_BYTES];
  66 \f
  67 void
  68 fetch_inferior_registers (regno)
  69      int regno;         /* Original value discarded */
  70 {
  71   register unsigned int regaddr;
  72   char buf[MAX_REGISTER_RAW_SIZE];
  73   register int i;
  74
  75   struct USER u;
  76   unsigned int offset;
  77
  78   offset = (char *) &u.pt_r0 - (char *) &u;
  79   regaddr = offset; /* byte offset to r0;*/
  80
  81 /*  offset = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) - KERNEL_U_ADDR; */
  82   for (regno = 0; regno < NUM_REGS; regno++)
  83     {
  84       /*regaddr = register_addr (regno, offset);*/
  85         /* 88k enhancement  */
  86
  87       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  88         {
  89           *(int *) &buf[i] = ptrace (3, inferior_pid,
  90                                      (PTRACE_ARG3_TYPE) regaddr, 0);
  91           regaddr += sizeof (int);
  92         }
  93       supply_register (regno, buf);
  94     }
  95     /* now load up registers 36 - 38; special pc registers */
  96     *(int *) &buf[0] = ptrace (3,inferior_pid,
  97                                (PTRACE_ARG3_TYPE) SXIP_OFFSET ,0);
  98     supply_register (SXIP_REGNUM, buf);
  99     *(int *) &buf[0] = ptrace (3, inferior_pid,
 100                                (PTRACE_ARG3_TYPE) SNIP_OFFSET,0);
 101     supply_register (SNIP_REGNUM, buf);
 102     *(int *) &buf[0] = ptrace (3, inferior_pid,
 103                                (PTRACE_ARG3_TYPE) SFIP_OFFSET,0);
 104     supply_register (SFIP_REGNUM, buf);
 105 }
 106
 107 /* Store our register values back into the inferior.
 108    If REGNO is -1, do this for all registers.
 109    Otherwise, REGNO specifies which register (so we can save time).  */
 110
 111 void
 112 store_inferior_registers (regno)
 113      int regno;
 114 {
 115   register unsigned int regaddr;
 116   char buf[80];
 117
 118   struct USER u;
 119
 120
 121   unsigned int offset = (char *) &u.pt_r0 - (char *) &u;
 122
 123   regaddr = offset;
 124
 125   if (regno >= 0)
 126     {
 127 /*      regaddr = register_addr (regno, offset); */
 128         if (regno < PC_REGNUM)
 129            {
 130              regaddr = offset + regno * sizeof (int);
 131              errno = 0;
 132              ptrace (6, inferior_pid,
 133                      (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 134              if (errno != 0)
 135                {
 136                  sprintf (buf, "writing register number %d", regno);
 137                  perror_with_name (buf);
 138                }
 139            }
 140         else if (regno == SXIP_REGNUM)
 141              ptrace (6, inferior_pid,
 142                      (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register(regno));
 143         else if (regno == SNIP_REGNUM)
 144              ptrace (6, inferior_pid,
 145                      (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register(regno));
 146         else if (regno == SFIP_REGNUM)
 147              ptrace (6, inferior_pid,
 148                      (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register(regno));
 149         else printf ("Bad register number for store_inferior routine\n");
 150     }
 151   else {
 152          for (regno = 0; regno < NUM_REGS - 3; regno++)
 153            {
 154       /*      regaddr = register_addr (regno, offset); */
 155               errno = 0;
 156               regaddr = offset + regno * sizeof (int);
 157               ptrace (6, inferior_pid,
 158                       (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 159               if (errno != 0)
 160                 {
 161                   sprintf (buf, "writing register number %d", regno);
 162                   perror_with_name (buf);
 163                 }
 164            }
 165          ptrace (6,inferior_pid,
 166                  (PTRACE_ARG3_TYPE) SXIP_OFFSET,read_register(SXIP_REGNUM));
 167          ptrace (6,inferior_pid,
 168                  (PTRACE_ARG3_TYPE) SNIP_OFFSET,read_register(SNIP_REGNUM));
 169          ptrace (6,inferior_pid,
 170                  (PTRACE_ARG3_TYPE) SFIP_OFFSET,read_register(SFIP_REGNUM));
 171        }
 172
 173
 174 }
 175
 176 #if 0
 177 /* Core files are now a function of BFD.  */
 178 \f
 179 void
 180 core_file_command (filename, from_tty)
 181      char *filename;
 182      int from_tty;
 183 {
 184   int val;
 185   extern char registers[];
 186
 187   /* Need symbol file and one with tdesc info for corefiles to work */
 188   if (!have_symbol_file_p())
 189     error ("Requires symbol-file and exec-file");
 190   if (!execfile)
 191     error ("Requires exec-file and symbol-file");
 192
 193   /* Discard all vestiges of any previous core file
 194      and mark data and stack spaces as empty.  */
 195
 196   if (corefile)
 197     free (corefile);
 198   corefile = 0;
 199
 200   if (corechan >= 0)
 201     close (corechan);
 202   corechan = -1;
 203
 204   data_start = 0;
 205   data_end = 0;
 206   stack_start = STACK_END_ADDR;
 207   stack_end = STACK_END_ADDR;
 208
 209   /* Now, if a new core file was specified, open it and digest it.  */
 210
 211   if (filename)
 212     {
 213       filename = tilde_expand (filename);
 214       make_cleanup (free, filename);
 215
 216       if (have_inferior_p ())
 217         error ("To look at a core file, you must kill the inferior with \"kill\".");
 218       corechan = open (filename, O_RDONLY, 0);
 219       if (corechan < 0)
 220         perror_with_name (filename);
 221       /* 4.2-style (and perhaps also sysV-style) core dump file.  */
 222       {
 223         struct USER u;
 224
 225         int reg_offset;
 226
 227         val = myread (corechan, &u, sizeof u);
 228         if (val < 0)
 229           perror_with_name (filename);
 230         data_start = u.pt_o_data_start;
 231
 232         data_end = data_start +  u.pt_dsize;
 233         stack_start = stack_end -  u.pt_ssize;
 234         data_offset = u.pt_dataptr;
 235         stack_offset = data_offset + u.pt_dsize;
 236
 237 #if defined(BCS)
 238 #if defined(DGUX)
 239
 240           reg_offset = 2048;
 241
 242
 243 #endif /* defined (DGUX) */
 244 #else
 245
 246         /* original code: */
 247         reg_offset = (int) u.pt_r0 - KERNEL_U_ADDR;
 248
 249 #endif /* defined(BCS) */
 250
 251         /* I don't know where to find this info.
 252            So, for now, mark it as not available.  */
 253 /*      N_SET_MAGIC (core_aouthdr, 0);  */
 254         bzero ((char *) &core_aouthdr, sizeof core_aouthdr);
 255
 256         /* Read the register values out of the core file and store
 257            them where `read_register' will find them.  */
 258
 259         {
 260           register int regno;
 261
 262           for (regno = 0; regno < NUM_REGS; regno++)
 263             {
 264               char buf[MAX_REGISTER_RAW_SIZE];
 265
 266               val = lseek (corechan, register_addr (regno, reg_offset), 0);
 267               if (val < 0)
 268                 perror_with_name (filename);
 269
 270               val = myread (corechan, buf, sizeof buf);
 271               if (val < 0)
 272                 perror_with_name (filename);
 273               supply_register (regno, buf);
 274             }
 275         }
 276       }
 277       if (filename[0] == '/')
 278         corefile = savestring (filename, strlen (filename));
 279       else
 280         {
 281           corefile = concat (current_directory, "/", filename, NULL);
 282         }
 283       init_tdesc();
 284       current_context = init_dcontext();
 285       set_current_frame ( create_new_frame(get_frame_base (read_pc()),
 286                                             read_pc ()));
 287       select_frame (get_current_frame (), 0);
 288       validate_files ();
 289     }
 290   else if (from_tty)
 291     printf ("No core file now.\n");
 292 }
 293 #endif
 294 \f
 295 /* blockend is the address of the end of the user structure */
 296 m88k_register_u_addr (blockend, regnum)
 297 {
 298   struct USER u;
 299   int ustart = blockend - sizeof (struct USER);
 300   switch (regnum)
 301     {
 302     case 0:
 303     case 1:
 304     case 2:
 305     case 3:
 306     case 4:
 307     case 5:
 308     case 6:
 309     case 7:
 310     case 8:
 311     case 9:
 312     case 10:
 313     case 11:
 314     case 12:
 315     case 13:
 316     case 14:
 317     case 15:
 318     case 16:
 319     case 17:
 320     case 18:
 321     case 19:
 322     case 20:
 323     case 21:
 324     case 22:
 325     case 23:
 326     case 24:
 327     case 25:
 328     case 26:
 329     case 27:
 330     case 28:
 331     case 29:
 332     case 30:
 333     case 31:          return (ustart + ((int) &u.pt_r0 - (int) &u) + sizeof(REGISTER_TYPE) * regnum);
 334     case PSR_REGNUM:  return (ustart + ((int) &u.pt_psr - (int) &u));
 335     case FPSR_REGNUM: return (ustart + ((int) &u.pt_fpsr - (int) &u));
 336     case FPCR_REGNUM: return (ustart + ((int) &u.pt_fpcr - (int) &u));
 337     case SXIP_REGNUM: return (ustart + SXIP_OFFSET);
 338     case SNIP_REGNUM: return (ustart + SNIP_OFFSET);
 339     case SFIP_REGNUM: return (ustart + SFIP_OFFSET);
 340     default: return (blockend + sizeof (REGISTER_TYPE) * regnum);
 341     }
 342 }