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