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., 675 Mass Ave, Cambridge, MA 02139, 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 /* 4.4 bfd support function */
  72 /* jtv@hut.fi: UNIMPLEMENTED!!!!! */
  73
  74 void
  75 fetch_core_registers (core_regs, core_reg_size, which)
  76      char *core_regs;
  77      unsigned int core_reg_size;
  78      int which;
  79 {
  80   error ("Unimplemented routine fetch_core_registers called");
  81 }
  82 \f
  83 /*
  84  * Fetch inferiors registers for gdb.
  85  * REGNO specifies which (as gdb views it) register, -1 for all.
  86  */
  87
  88 void
  89 fetch_inferior_registers (regno)
  90      int regno;
  91 {
  92   kern_return_t ret;
  93   thread_state_data_t state;
  94   unsigned int stateCnt = NS532_COMBINED_STATE_COUNT;
  95   int index;
  96
  97   if (! MACH_PORT_VALID (current_thread))
  98     error ("fetch inferior registers: Invalid thread");
  99
 100   if (must_suspend_thread)
 101     setup_thread (current_thread, 1);
 102
 103   ret = thread_get_state (current_thread,
 104                           NS532_COMBINED_STATE,
 105                           state,
 106                           &stateCnt);
 107
 108   if (ret != KERN_SUCCESS)
 109     message ("fetch_inferior_registers: %s ",
 110              mach_error_string (ret));
 111 #if 0
 112   /* It may be more effective to store validate all of them,
 113    * since we fetched them all anyway
 114    */
 115   else if (regno != -1)
 116     supply_register (regno, (char *)state+reg_offset[regno]);
 117 #endif
 118   else
 119     {
 120       for (index = 0; index < NUM_REGS; index++)
 121         supply_register (index, (char *)state+reg_offset[index]);
 122     }
 123
 124   if (must_suspend_thread)
 125     setup_thread (current_thread, 0);
 126 }
 127 \f
 128 /* Store our register values back into the inferior.
 129  * If REGNO is -1, do this for all registers.
 130  * Otherwise, REGNO specifies which register
 131  *
 132  * On mach3 all registers are always saved in one call.
 133  */
 134 void
 135 store_inferior_registers (regno)
 136      int regno;
 137 {
 138   kern_return_t ret;
 139   thread_state_data_t state;
 140   unsigned int stateCnt = NS532_COMBINED_STATE_COUNT;
 141   register int index;
 142
 143   if (! MACH_PORT_VALID (current_thread))
 144     error ("store inferior registers: Invalid thread");
 145
 146   if (must_suspend_thread)
 147     setup_thread (current_thread, 1);
 148
 149   /* Fetch the state of the current thread */
 150   ret = thread_get_state (current_thread,
 151                           NS532_COMBINED_STATE,
 152                           state,
 153                           &stateCnt);
 154
 155    if (ret != KERN_SUCCESS)
 156     {
 157       message ("store_inferior_registers (get): %s",
 158                mach_error_string (ret));
 159       if (must_suspend_thread)
 160         setup_thread (current_thread, 0);
 161       return;
 162     }
 163
 164   /* move gdb's registers to thread's state
 165    *
 166    * Since we save all registers anyway, save the ones
 167    * that gdb thinks are valid (e.g. ignore the regno
 168    * parameter)
 169    */
 170 #if 0
 171   if (regno != -1)
 172     STORE_REGS (state, regno, 1);
 173   else
 174 #endif
 175     {
 176       for (index = 0; index < NUM_REGS; index++)
 177         STORE_REGS (state, index, 1);
 178     }
 179
 180   /* Write gdb's current view of register to the thread
 181    */
 182   ret = thread_set_state (current_thread,
 183                           NS532_COMBINED_STATE,
 184                           state,
 185                           NS532_COMBINED_STATE_COUNT);
 186
 187   if (ret != KERN_SUCCESS)
 188     message ("store_inferior_registers (set): %s",
 189              mach_error_string (ret));
 190
 191   if (must_suspend_thread)
 192     setup_thread (current_thread, 0);
 193 }