gdb/m88k-xdep.c

   1 /* Copyright (C) 1988, 1990 Free Software Foundation, Inc.
   2
   3 This file is part of GDB.
   4
   5 GDB is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 1, or (at your option)
   8 any later version.
   9
  10 GDB is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GDB; see the file COPYING.  If not, write to
  17 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  18
  19 #include <stdio.h>
  20 #include "defs.h"
  21 #include "param.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24
  25 #ifdef USG
  26 #include <sys/types.h>
  27 #endif
  28
  29 #include <sys/param.h>
  30 #include <sys/dir.h>
  31 #include <signal.h>
  32 #include "gdbcore.h"
  33 #include <sys/user.h>
  34 #ifndef USER                    /* added to support BCS ptrace_user */
  35
  36 #define USER ptrace_user
  37 #endif
  38 #include <sys/ioctl.h>
  39 #include <fcntl.h>
  40
  41 #ifdef COFF_ENCAPSULATE
  42 #include "a.out.encap.h"
  43 #else
  44 #include <a.out.h>
  45 #endif
  46
  47 #include <sys/file.h>
  48 #include <sys/stat.h>
  49
  50 #include "symtab.h"
  51 #include "setjmp.h"
  52 #include "value.h"
  53
  54 /* define offsets to the pc instruction offsets in ptrace_user struct */
  55 #define SXIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_sxip - \
  56                                 (char *)&u
  57
  58 #define SNIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_snip - \
  59                                 (char *)&u
  60
  61 #define SFIP_OFFSET (char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u
  62 extern int have_symbol_file_p();
  63
  64 extern jmp_buf stack_jmp;
  65
  66 extern int errno;
  67 extern char registers[REGISTER_BYTES];
  68 \f
  69 void
  70 fetch_inferior_registers ()
  71 {
  72   register int regno;
  73   register unsigned int regaddr;
  74   char buf[MAX_REGISTER_RAW_SIZE];
  75   register int i;
  76
  77   struct USER u;
  78   unsigned int offset;
  79
  80   offset = (char *) &u.pt_r0 - (char *) &u;
  81   regaddr = offset; /* byte offset to r0;*/
  82
  83 /*  offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; */
  84   for (regno = 0; regno < NUM_REGS; regno++)
  85     {
  86       /*regaddr = register_addr (regno, offset);*/
  87         /* 88k enhancement  */
  88
  89       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  90         {
  91           *(int *) &buf[i] = ptrace (3, inferior_pid, regaddr, 0);
  92           regaddr += sizeof (int);
  93         }
  94       supply_register (regno, buf);
  95     }
  96     /* now load up registers 36 - 38; special pc registers */
  97     *(int *) &buf[0] = ptrace (3,inferior_pid,(char *)&u.pt_sigframe.dg_sigframe.sc_sxip - (char *)&u ,0);
  98     supply_register (SXIP_REGNUM, buf);
  99     *(int *) &buf[0] = ptrace (3, inferior_pid, (char *)&u.pt_sigframe.dg_sigframe.sc_snip - (char *)&u ,0);
 100     supply_register (SNIP_REGNUM, buf);
 101     *(int *) &buf[0] = ptrace (3, inferior_pid, (char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u ,0);
 102     supply_register (SFIP_REGNUM, buf);
 103 }
 104
 105 /* Store our register values back into the inferior.
 106    If REGNO is -1, do this for all registers.
 107    Otherwise, REGNO specifies which register (so we can save time).  */
 108
 109 store_inferior_registers (regno)
 110      int regno;
 111 {
 112   register unsigned int regaddr;
 113   char buf[80];
 114
 115   struct USER u;
 116
 117 #if defined(BCS)
 118 #if defined(DGUX)
 119
 120   unsigned int offset = (char *) &u.pt_r0 - (char *) &u;
 121
 122 #endif /* defined (DGUX) */
 123 #else
 124
 125   unsigned int offset = (char *) &u.pt_r0 - (char *) &u;
 126
 127 #endif /* defined(BCS) */
 128 /*  offset = ptrace (3, inferior_pid, offset, 0) - KERNEL_U_ADDR; */
 129   regaddr = offset;
 130
 131   if (regno >= 0)
 132     {
 133 /*      regaddr = register_addr (regno, offset); */
 134         if (regno < PC_REGNUM)
 135            {
 136              regaddr = offset + regno * sizeof (int);
 137              errno = 0;
 138              ptrace (6, inferior_pid, regaddr, read_register (regno));
 139              if (errno != 0)
 140                {
 141                  sprintf (buf, "writing register number %d", regno);
 142                  perror_with_name (buf);
 143                }
 144            }
 145         else if (regno == SXIP_REGNUM)
 146              ptrace (6, inferior_pid, SXIP_OFFSET, read_register(regno));
 147         else if (regno == SNIP_REGNUM)
 148              ptrace (6, inferior_pid, SNIP_OFFSET, read_register(regno));
 149         else if (regno == SFIP_REGNUM)
 150              ptrace (6, inferior_pid, SFIP_OFFSET, read_register(regno));
 151         else printf ("Bad register number for store_inferior routine\n");
 152     }
 153   else {
 154          for (regno = 0; regno < NUM_REGS - 3; regno++)
 155            {
 156       /*      regaddr = register_addr (regno, offset); */
 157               errno = 0;
 158               regaddr = offset + regno * sizeof (int);
 159               ptrace (6, inferior_pid, regaddr, read_register (regno));
 160               if (errno != 0)
 161                 {
 162                   sprintf (buf, "writing register number %d", regno);
 163                   perror_with_name (buf);
 164                 }
 165            }
 166          ptrace (6,inferior_pid,SXIP_OFFSET,read_register(SXIP_REGNUM));
 167          ptrace (6,inferior_pid,SNIP_OFFSET,read_register(SNIP_REGNUM));
 168          ptrace (6,inferior_pid,SFIP_OFFSET,read_register(SFIP_REGNUM));
 169        }
 170
 171
 172 }
 173
 174 #if 0
 175 /* Core files are now a function of BFD.  */
 176 \f
 177 void
 178 core_file_command (filename, from_tty)
 179      char *filename;
 180      int from_tty;
 181 {
 182   int val;
 183   extern char registers[];
 184
 185   /* Need symbol file and one with tdesc info for corefiles to work */
 186   if (!have_symbol_file_p())
 187     error ("Requires symbol-file and exec-file");
 188   if (!execfile)
 189     error ("Requires exec-file and symbol-file");
 190
 191   /* Discard all vestiges of any previous core file
 192      and mark data and stack spaces as empty.  */
 193
 194   if (corefile)
 195     free (corefile);
 196   corefile = 0;
 197
 198   if (corechan >= 0)
 199     close (corechan);
 200   corechan = -1;
 201
 202   data_start = 0;
 203   data_end = 0;
 204   stack_start = STACK_END_ADDR;
 205   stack_end = STACK_END_ADDR;
 206
 207   /* Now, if a new core file was specified, open it and digest it.  */
 208
 209   if (filename)
 210     {
 211       filename = tilde_expand (filename);
 212       make_cleanup (free, filename);
 213
 214       if (have_inferior_p ())
 215         error ("To look at a core file, you must kill the inferior with \"kill\".");
 216       corechan = open (filename, O_RDONLY, 0);
 217       if (corechan < 0)
 218         perror_with_name (filename);
 219       /* 4.2-style (and perhaps also sysV-style) core dump file.  */
 220       {
 221         struct USER u;
 222
 223         int reg_offset;
 224
 225         val = myread (corechan, &u, sizeof u);
 226         if (val < 0)
 227           perror_with_name (filename);
 228         data_start = u.pt_o_data_start;
 229
 230         data_end = data_start +  u.pt_dsize;
 231         stack_start = stack_end -  u.pt_ssize;
 232         data_offset = u.pt_dataptr;
 233         stack_offset = data_offset + u.pt_dsize;
 234
 235 #if defined(BCS)
 236 #if defined(DGUX)
 237
 238           reg_offset = 2048;
 239
 240
 241 #endif /* defined (DGUX) */
 242 #else
 243
 244         /* original code: */
 245         reg_offset = (int) u.pt_r0 - KERNEL_U_ADDR;
 246
 247 #endif /* defined(BCS) */
 248
 249         /* I don't know where to find this info.
 250            So, for now, mark it as not available.  */
 251 /*      N_SET_MAGIC (core_aouthdr, 0);  */
 252         bzero ((char *) &core_aouthdr, sizeof core_aouthdr);
 253
 254         /* Read the register values out of the core file and store
 255            them where `read_register' will find them.  */
 256
 257         {
 258           register int regno;
 259
 260           for (regno = 0; regno < NUM_REGS; regno++)
 261             {
 262               char buf[MAX_REGISTER_RAW_SIZE];
 263
 264               val = lseek (corechan, register_addr (regno, reg_offset), 0);
 265               if (val < 0)
 266                 perror_with_name (filename);
 267
 268               val = myread (corechan, buf, sizeof buf);
 269               if (val < 0)
 270                 perror_with_name (filename);
 271               supply_register (regno, buf);
 272             }
 273         }
 274       }
 275       if (filename[0] == '/')
 276         corefile = savestring (filename, strlen (filename));
 277       else
 278         {
 279           corefile = concat (current_directory, "/", filename);
 280         }
 281       init_tdesc();
 282       current_context = init_dcontext();
 283       set_current_frame ( create_new_frame(get_frame_base (read_pc()),
 284                                             read_pc ()));
 285       select_frame (get_current_frame (), 0);
 286       validate_files ();
 287     }
 288   else if (from_tty)
 289     printf ("No core file now.\n");
 290 }
 291 #endif
 292 \f
 293 /* blockend is the address of the end of the user structure */
 294 m88k_register_u_addr (blockend, regnum)
 295 {
 296   struct USER u;
 297   int ustart = blockend - sizeof (struct USER);
 298   switch (regnum)
 299     {
 300     case 0:
 301     case 1:
 302     case 2:
 303     case 3:
 304     case 4:
 305     case 5:
 306     case 6:
 307     case 7:
 308     case 8:
 309     case 9:
 310     case 10:
 311     case 11:
 312     case 12:
 313     case 13:
 314     case 14:
 315     case 15:
 316     case 16:
 317     case 17:
 318     case 18:
 319     case 19:
 320     case 20:
 321     case 21:
 322     case 22:
 323     case 23:
 324     case 24:
 325     case 25:
 326     case 26:
 327     case 27:
 328     case 28:
 329     case 29:
 330     case 30:
 331     case 31:          return (ustart + ((int) &u.pt_r0 - (int) &u) + sizeof(REGISTER_TYPE) * regnum);
 332     case PSR_REGNUM:  return (ustart + ((int) &u.pt_psr - (int) &u));
 333     case FPSR_REGNUM: return (ustart + ((int) &u.pt_fpsr - (int) &u));
 334     case FPCR_REGNUM: return (ustart + ((int) &u.pt_fpcr - (int) &u));
 335     case SXIP_REGNUM: return (ustart + SXIP_OFFSET);
 336     case SNIP_REGNUM: return (ustart + SNIP_OFFSET);
 337     case SFIP_REGNUM: return (ustart + SFIP_OFFSET);
 338     default: return (blockend + sizeof (REGISTER_TYPE) * regnum);
 339     }
 340 }