gdb/gdbserver/regcache.c

   1 /* Register support routines for the remote server for GDB.
   2    Copyright (C) 2001, 2002, 2004, 2005
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "server.h"
  23 #include "regdef.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 /* The private data for the register cache.  Note that we have one
  29    per inferior; this is primarily for simplicity, as the performance
  30    benefit is minimal.  */
  31
  32 struct inferior_regcache_data
  33 {
  34   int registers_valid;
  35   unsigned char *registers;
  36 };
  37
  38 static int register_bytes;
  39
  40 static struct reg *reg_defs;
  41 static int num_registers;
  42
  43 const char **gdbserver_expedite_regs;
  44
  45 static struct inferior_regcache_data *
  46 get_regcache (struct thread_info *inf, int fetch)
  47 {
  48   struct inferior_regcache_data *regcache;
  49
  50   regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf);
  51
  52   if (regcache == NULL)
  53     fatal ("no register cache");
  54
  55   /* FIXME - fetch registers for INF */
  56   if (fetch && regcache->registers_valid == 0)
  57     {
  58       fetch_inferior_registers (0);
  59       regcache->registers_valid = 1;
  60     }
  61
  62   return regcache;
  63 }
  64
  65 void
  66 regcache_invalidate_one (struct inferior_list_entry *entry)
  67 {
  68   struct thread_info *thread = (struct thread_info *) entry;
  69   struct inferior_regcache_data *regcache;
  70
  71   regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread);
  72
  73   if (regcache->registers_valid)
  74     {
  75       struct thread_info *saved_inferior = current_inferior;
  76
  77       current_inferior = thread;
  78       store_inferior_registers (-1);
  79       current_inferior = saved_inferior;
  80     }
  81
  82   regcache->registers_valid = 0;
  83 }
  84
  85 void
  86 regcache_invalidate ()
  87 {
  88   for_each_inferior (&all_threads, regcache_invalidate_one);
  89 }
  90
  91 int
  92 registers_length (void)
  93 {
  94   return 2 * register_bytes;
  95 }
  96
  97 void *
  98 new_register_cache (void)
  99 {
 100   struct inferior_regcache_data *regcache;
 101
 102   regcache = malloc (sizeof (*regcache));
 103
 104   /* Make sure to zero-initialize the register cache when it is created,
 105      in case there are registers the target never fetches.  This way they'll
 106      read as zero instead of garbage.  */
 107   regcache->registers = calloc (1, register_bytes);
 108   if (regcache->registers == NULL)
 109     fatal ("Could not allocate register cache.");
 110
 111   regcache->registers_valid = 0;
 112
 113   return regcache;
 114 }
 115
 116 void
 117 free_register_cache (void *regcache_p)
 118 {
 119   struct inferior_regcache_data *regcache
 120     = (struct inferior_regcache_data *) regcache_p;
 121
 122   free (regcache->registers);
 123   free (regcache);
 124 }
 125
 126 void
 127 set_register_cache (struct reg *regs, int n)
 128 {
 129   int offset, i;
 130
 131   reg_defs = regs;
 132   num_registers = n;
 133
 134   offset = 0;
 135   for (i = 0; i < n; i++)
 136     {
 137       regs[i].offset = offset;
 138       offset += regs[i].size;
 139     }
 140
 141   register_bytes = offset / 8;
 142 }
 143
 144 void
 145 registers_to_string (char *buf)
 146 {
 147   unsigned char *registers = get_regcache (current_inferior, 1)->registers;
 148
 149   convert_int_to_ascii (registers, buf, register_bytes);
 150 }
 151
 152 void
 153 registers_from_string (char *buf)
 154 {
 155   int len = strlen (buf);
 156   unsigned char *registers = get_regcache (current_inferior, 1)->registers;
 157
 158   if (len != register_bytes * 2)
 159     {
 160       warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len);
 161       if (len > register_bytes * 2)
 162         len = register_bytes * 2;
 163     }
 164   convert_ascii_to_int (buf, registers, len / 2);
 165 }
 166
 167 struct reg *
 168 find_register_by_name (const char *name)
 169 {
 170   int i;
 171
 172   for (i = 0; i < num_registers; i++)
 173     if (!strcmp (name, reg_defs[i].name))
 174       return &reg_defs[i];
 175   fatal ("Unknown register %s requested", name);
 176   return 0;
 177 }
 178
 179 int
 180 find_regno (const char *name)
 181 {
 182   int i;
 183
 184   for (i = 0; i < num_registers; i++)
 185     if (!strcmp (name, reg_defs[i].name))
 186       return i;
 187   fatal ("Unknown register %s requested", name);
 188   return -1;
 189 }
 190
 191 struct reg *
 192 find_register_by_number (int n)
 193 {
 194   return &reg_defs[n];
 195 }
 196
 197 int
 198 register_size (int n)
 199 {
 200   return reg_defs[n].size / 8;
 201 }
 202
 203 static unsigned char *
 204 register_data (int n, int fetch)
 205 {
 206   unsigned char *registers
 207     = get_regcache (current_inferior, fetch)->registers;
 208
 209   return registers + (reg_defs[n].offset / 8);
 210 }
 211
 212 void
 213 supply_register (int n, const void *buf)
 214 {
 215   memcpy (register_data (n, 0), buf, register_size (n));
 216 }
 217
 218 void
 219 supply_register_by_name (const char *name, const void *buf)
 220 {
 221   supply_register (find_regno (name), buf);
 222 }
 223
 224 void
 225 collect_register (int n, void *buf)
 226 {
 227   memcpy (buf, register_data (n, 1), register_size (n));
 228 }
 229
 230 void
 231 collect_register_as_string (int n, char *buf)
 232 {
 233   convert_int_to_ascii (register_data (n, 1), buf, register_size (n));
 234 }
 235
 236 void
 237 collect_register_by_name (const char *name, void *buf)
 238 {
 239   collect_register (find_regno (name), buf);
 240 }