gdb/dpx2-nat.c

   1 /* DPX2 host interface.
   2    Copyright (C) 1988, 1989, 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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "gdbcore.h"
  23
  24 #include "gdb_string.h"
  25 #include <sys/types.h>
  26 #include <sys/param.h>
  27 #include <sys/dir.h>
  28 #include <signal.h>
  29 #include <sys/user.h>
  30 #include <sys/reg.h>
  31 #include <sys/utsname.h>
  32 \f
  33
  34 /* this table must line up with REGISTER_NAMES in tm-68k.h */
  35 /* symbols like 'A0' come from <sys/reg.h> */
  36 static int regmap[] =
  37 {
  38   R0, R1, R2, R3, R4, R5, R6, R7,
  39   A0, A1, A2, A3, A4, A5, A6, SP,
  40   PS, PC,
  41   FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7,
  42   FP_CR, FP_SR, FP_IAR
  43 };
  44
  45 /* blockend is the value of u.u_ar0, and points to the
  46  * place where D0 is stored
  47  */
  48
  49 int
  50 dpx2_register_u_addr (int blockend, int regnum)
  51 {
  52   if (regnum < FP0_REGNUM)
  53     return (blockend + 4 * regmap[regnum]);
  54   else
  55     return (int) &(((struct user *) 0)->u_fpstate[regmap[regnum]]);
  56 }
  57
  58 /* This is the amount to subtract from u.u_ar0
  59    to get the offset in the core file of the register values.
  60    Unfortunately this is not provided in the system header files.
  61    To make matters worse, this value also differs between
  62    the dpx/2200 and dpx/2300 models and nlist is not available on the dpx2.
  63    We use utsname() to decide on which model we are running.
  64    FIXME: This breaks cross examination of core files (it would not be hard
  65    to check whether u.u_ar0 is between 0x7fff5000 and 0x7fffc000 and if so
  66    use 0x7fff5000 and if not use 0x7fffc000.  FIXME).  */
  67
  68 #define KERNEL_U_ADDR_200 0x7fff5000
  69 #define KERNEL_U_ADDR_300 0x7fffc000
  70
  71 CORE_ADDR kernel_u_addr;
  72
  73 void
  74 _initialize_dpx2_nat (void)
  75 {
  76   struct utsname uts;
  77
  78   if (uname (&uts) == 0 && strcmp (uts.machine, "DPX/2200") == 0)
  79     kernel_u_addr = KERNEL_U_ADDR_200;
  80   else
  81     kernel_u_addr = KERNEL_U_ADDR_300;
  82 }