gdb/delta68-nat.c

   1 /* Functions specific to running gdb native on a Motorola Delta Series sysV68.
   2    Copyright (C) 1993, 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 <sys/signal.h> /* for MAXSIG in sys/user.h */
  22 #include <sys/types.h>  /* for ushort in sys/dir.h */
  23 #include <sys/dir.h>    /* for struct direct in sys/user.h */
  24 #include <sys/user.h>
  25
  26 #include <nlist.h>
  27
  28 #if !defined (offsetof)
  29 #define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
  30 #endif
  31
  32 /* Return the address in the core dump or inferior of register REGNO.
  33    BLOCKEND is the address of the end of the user structure.  */
  34
  35 unsigned int
  36 register_addr (regno, blockend)
  37      int        regno;
  38      int        blockend;
  39 {
  40   static int    sysv68reg[] =
  41     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, -1, 15, 16 };
  42
  43   if (regno >= 0 && regno < sizeof(sysv68reg) / sizeof(sysv68reg[0]))
  44     return blockend + sysv68reg[regno] * 4;
  45   else if (regno < FPC_REGNUM)
  46     return offsetof (struct user, u_fpu.regs.reg[regno - FP0_REGNUM][0]
  47   else if (regno == FPC_REGNUM)
  48     return offsetof (struct user, u_fpu.regs.control);
  49   else if (regno == FPS_REGNUM)
  50     return offsetof (struct user, u_fpu.regs.status);
  51   else if (regno == FPI_REGNUM)
  52     return offsetof (struct user, u_fpu.regs.iaddr);
  53   else
  54     {
  55       fprintf (stderr, "\
  56 Internal error: invalid register number %d in REGISTER_U_ADDR\n",
  57                regno);
  58       return blockend;
  59     }
  60 }
  61
  62 CORE_ADDR kernel_u_addr;
  63
  64 /* Read the value of the u area from the kernel.  */
  65 void _initialize_kernel_u_addr ()
  66 {
  67   stuct nlist nl[2];
  68
  69   nl[0].n_name = "u";
  70   nl[1].n_name = NULL;
  71   if (nlist ("/sysV68", nl) == 0 && nl[0].n_scnum != 0)
  72     kernel_u_addr = nl[0].n_value;
  73   else
  74     {
  75       perror ("Cannot get kernel u area address");
  76       exit (1);
  77     }
  78 }