gdb/ns32km3-nat.c

   1 /* Low level interface to ns532 running mach 3.0.
   2    Copyright (C) 1992 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, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22
  23 #include <stdio.h>
  24
  25 #include <mach.h>
  26 #include <mach/message.h>
  27 #include <mach/exception.h>
  28 #include <mach_error.h>
  29
  30 #define private static
  31
  32 \f
  33 /* Find offsets to thread states at compile time.
  34  * If your compiler does not grok this, calculate offsets
  35  * offsets yourself and use them (or get a compatible compiler :-)
  36  */
  37
  38 #define  REG_N_OFFSET(reg) (int)(&((struct ns532_combined_state *)0)->ts.reg)
  39 #define  REG_F_OFFSET(reg) (int)(&((struct ns532_combined_state *)0)->fs.reg)
  40
  41 /* at reg_offset[i] is the offset to the ns532_combined_state
  42  * location where the gdb registers[i] is stored.
  43  */
  44
  45 static int reg_offset[] =
  46 {
  47   REG_N_OFFSET(r0),  REG_N_OFFSET(r1), REG_N_OFFSET(r2), REG_N_OFFSET(r3),
  48   REG_N_OFFSET(r4),  REG_N_OFFSET(r5), REG_N_OFFSET(r6), REG_N_OFFSET(r7),
  49   REG_F_OFFSET(l0a), REG_F_OFFSET(l1a),REG_F_OFFSET(l2a),REG_F_OFFSET(l3a),
  50   REG_F_OFFSET(l4a), REG_F_OFFSET(l5a),REG_F_OFFSET(l6a),REG_F_OFFSET(l7a),
  51   REG_N_OFFSET(sp),  REG_N_OFFSET(fp), REG_N_OFFSET(pc), REG_N_OFFSET(psr),
  52   REG_F_OFFSET(fsr),
  53   REG_F_OFFSET(l0a), REG_F_OFFSET(l2a),REG_F_OFFSET(l4a),REG_F_OFFSET(l6a)
  54   /* @@@ 532 has more double length floating point regs, not accessed currently */
  55 };
  56
  57 /* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
  58  * Caller knows that the regs handled in one transaction are of same size.
  59  */
  60 #define FETCH_REGS(state, regnum, count) \
  61   memcpy (&registers[REGISTER_BYTE (regnum)], \
  62           (char *)state+reg_offset[ regnum ], \
  63           count*REGISTER_SIZE)
  64
  65 /* Store COUNT contiguous registers to thread STATE starting from REGNUM */
  66 #define STORE_REGS(state, regnum, count) \
  67   memcpy ((char *)state+reg_offset[ regnum ], \
  68           &registers[REGISTER_BYTE (regnum)], \
  69           count*REGISTER_SIZE)
  70 \f
  71 /*
  72  * Fetch inferiors registers for gdb.
  73  * REGNO specifies which (as gdb views it) register, -1 for all.
  74  */
  75
  76 void
  77 fetch_inferior_registers (regno)
  78      int regno;
  79 {
  80   kern_return_t ret;
  81   thread_state_data_t state;
  82   unsigned int stateCnt = NS532_COMBINED_STATE_COUNT;
  83   int index;
  84
  85   if (! MACH_PORT_VALID (current_thread))
  86     error ("fetch inferior registers: Invalid thread");
  87
  88   if (must_suspend_thread)
  89     setup_thread (current_thread, 1);
  90
  91   ret = thread_get_state (current_thread,
  92                           NS532_COMBINED_STATE,
  93                           state,
  94                           &stateCnt);
  95
  96   if (ret != KERN_SUCCESS)
  97     message ("fetch_inferior_registers: %s ",
  98              mach_error_string (ret));
  99 #if 0
 100   /* It may be more effective to store validate all of them,
 101    * since we fetched them all anyway
 102    */
 103   else if (regno != -1)
 104     supply_register (regno, (char *)state+reg_offset[regno]);
 105 #endif
 106   else
 107     {
 108       for (index = 0; index < NUM_REGS; index++)
 109         supply_register (index, (char *)state+reg_offset[index]);
 110     }
 111
 112   if (must_suspend_thread)
 113     setup_thread (current_thread, 0);
 114 }
 115 \f
 116 /* Store our register values back into the inferior.
 117  * If REGNO is -1, do this for all registers.
 118  * Otherwise, REGNO specifies which register
 119  *
 120  * On mach3 all registers are always saved in one call.
 121  */
 122 void
 123 store_inferior_registers (regno)
 124      int regno;
 125 {
 126   kern_return_t ret;
 127   thread_state_data_t state;
 128   unsigned int stateCnt = NS532_COMBINED_STATE_COUNT;
 129   register int index;
 130
 131   if (! MACH_PORT_VALID (current_thread))
 132     error ("store inferior registers: Invalid thread");
 133
 134   if (must_suspend_thread)
 135     setup_thread (current_thread, 1);
 136
 137   /* Fetch the state of the current thread */
 138   ret = thread_get_state (current_thread,
 139                           NS532_COMBINED_STATE,
 140                           state,
 141                           &stateCnt);
 142
 143    if (ret != KERN_SUCCESS)
 144     {
 145       message ("store_inferior_registers (get): %s",
 146                mach_error_string (ret));
 147       if (must_suspend_thread)
 148         setup_thread (current_thread, 0);
 149       return;
 150     }
 151
 152   /* move gdb's registers to thread's state
 153    *
 154    * Since we save all registers anyway, save the ones
 155    * that gdb thinks are valid (e.g. ignore the regno
 156    * parameter)
 157    */
 158 #if 0
 159   if (regno != -1)
 160     STORE_REGS (state, regno, 1);
 161   else
 162 #endif
 163     {
 164       for (index = 0; index < NUM_REGS; index++)
 165         STORE_REGS (state, index, 1);
 166     }
 167
 168   /* Write gdb's current view of register to the thread
 169    */
 170   ret = thread_set_state (current_thread,
 171                           NS532_COMBINED_STATE,
 172                           state,
 173                           NS532_COMBINED_STATE_COUNT);
 174
 175   if (ret != KERN_SUCCESS)
 176     message ("store_inferior_registers (set): %s",
 177              mach_error_string (ret));
 178
 179   if (must_suspend_thread)
 180     setup_thread (current_thread, 0);
 181 }