src/libs/libunwind/mi/Gdyn-remote.c

   1 /* libunwind - a platform-independent unwind library
   2    Copyright (C) 2001-2002, 2005 Hewlett-Packard Co
   3         Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
   4
   5 This file is part of libunwind.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining
   8 a copy of this software and associated documentation files (the
   9 "Software"), to deal in the Software without restriction, including
  10 without limitation the rights to use, copy, modify, merge, publish,
  11 distribute, sublicense, and/or sell copies of the Software, and to
  12 permit persons to whom the Software is furnished to do so, subject to
  13 the following conditions:
  14
  15 The above copyright notice and this permission notice shall be
  16 included in all copies or substantial portions of the Software.
  17
  18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
  25
  26 #include <stdlib.h>
  27
  28 #include "libunwind_i.h"
  29 #include "remote.h"
  30
  31 static void
  32 free_regions (unw_dyn_region_info_t *region)
  33 {
  34   if (region->next)
  35     free_regions (region->next);
  36   free (region);
  37 }
  38
  39 static int
  40 intern_op (unw_addr_space_t as, unw_accessors_t *a, unw_word_t *addr,
  41            unw_dyn_op_t *op, void *arg)
  42 {
  43   int ret;
  44
  45   if ((ret = fetch8 (as, a, addr, &op->tag, arg)) < 0
  46       || (ret = fetch8 (as, a, addr, &op->qp, arg)) < 0
  47       || (ret = fetch16 (as, a, addr, &op->reg, arg)) < 0
  48       || (ret = fetch32 (as, a, addr, &op->when, arg)) < 0
  49       || (ret = fetchw  (as, a, addr, &op->val, arg)) < 0)
  50     return ret;
  51   return 0;
  52 }
  53
  54 static int
  55 intern_regions (unw_addr_space_t as, unw_accessors_t *a,
  56                 unw_word_t *addr, unw_dyn_region_info_t **regionp, void *arg)
  57 {
  58   uint32_t insn_count, op_count, i;
  59   unw_dyn_region_info_t *region;
  60   unw_word_t next_addr;
  61   int ret;
  62
  63   *regionp = NULL;
  64
  65   if (!*addr)
  66     return 0;   /* NULL region-list */
  67
  68   if ((ret = fetchw (as, a, addr, &next_addr, arg)) < 0
  69       || (ret = fetch32 (as, a, addr, (int32_t *) &insn_count, arg)) < 0
  70       || (ret = fetch32 (as, a, addr, (int32_t *) &op_count, arg)) < 0)
  71     return ret;
  72
  73   region = calloc (1, _U_dyn_region_info_size (op_count));
  74   if (!region)
  75     {
  76       ret = -UNW_ENOMEM;
  77       goto out;
  78     }
  79
  80   region->insn_count = insn_count;
  81   region->op_count = op_count;
  82   for (i = 0; i < op_count; ++i)
  83     if ((ret = intern_op (as, a, addr, region->op + i, arg)) < 0)
  84       goto out;
  85
  86   if (next_addr)
  87     if ((ret = intern_regions (as, a, &next_addr, &region->next, arg)) < 0)
  88       goto out;
  89
  90   *regionp = region;
  91   return 0;
  92
  93  out:
  94   if (region)
  95     free_regions (region);
  96   return ret;
  97 }
  98
  99 static int
 100 intern_array (unw_addr_space_t as, unw_accessors_t *a,
 101               unw_word_t *addr, unw_word_t table_len, unw_word_t **table_data,
 102               void *arg)
 103 {
 104   unw_word_t i, *data = calloc (table_len, WSIZE);
 105   int ret = 0;
 106
 107   if (!data)
 108     {
 109       ret = -UNW_ENOMEM;
 110       goto out;
 111     }
 112
 113   for (i = 0; i < table_len; ++i)
 114     if (fetchw (as, a, addr, data + i, arg) < 0)
 115       goto out;
 116
 117   *table_data = data;
 118   return 0;
 119
 120  out:
 121   if (data)
 122     free (data);
 123   return ret;
 124 }
 125
 126 static void
 127 free_dyn_info (unw_dyn_info_t *di)
 128 {
 129   switch (di->format)
 130     {
 131     case UNW_INFO_FORMAT_DYNAMIC:
 132       if (di->u.pi.regions)
 133         {
 134           free_regions (di->u.pi.regions);
 135           di->u.pi.regions = NULL;
 136         }
 137       break;
 138
 139     case UNW_INFO_FORMAT_TABLE:
 140       if (di->u.ti.table_data)
 141         {
 142           free (di->u.ti.table_data);
 143           di->u.ti.table_data = NULL;
 144         }
 145       break;
 146
 147     case UNW_INFO_FORMAT_REMOTE_TABLE:
 148     default:
 149       break;
 150     }
 151 }
 152
 153 static int
 154 intern_dyn_info (unw_addr_space_t as, unw_accessors_t *a,
 155                  unw_word_t *addr, unw_dyn_info_t *di, void *arg)
 156 {
 157   unw_word_t first_region;
 158   int ret;
 159
 160   switch (di->format)
 161     {
 162     case UNW_INFO_FORMAT_DYNAMIC:
 163       if ((ret = fetchw (as, a, addr, &di->u.pi.name_ptr, arg)) < 0
 164           || (ret = fetchw (as, a, addr, &di->u.pi.handler, arg)) < 0
 165           || (ret = fetch32 (as, a, addr,
 166                              (int32_t *) &di->u.pi.flags, arg)) < 0)
 167         goto out;
 168       *addr += 4;       /* skip over pad0 */
 169       if ((ret = fetchw (as, a, addr, &first_region, arg)) < 0
 170           || (ret = intern_regions (as, a, &first_region, &di->u.pi.regions,
 171                                     arg)) < 0)
 172         goto out;
 173       break;
 174
 175     case UNW_INFO_FORMAT_TABLE:
 176       if ((ret = fetchw (as, a, addr, &di->u.ti.name_ptr, arg)) < 0
 177           || (ret = fetchw (as, a, addr, &di->u.ti.segbase, arg)) < 0
 178           || (ret = fetchw (as, a, addr, &di->u.ti.table_len, arg)) < 0
 179           || (ret = intern_array (as, a, addr, di->u.ti.table_len,
 180                                   &di->u.ti.table_data, arg)) < 0)
 181         goto out;
 182       break;
 183
 184     case UNW_INFO_FORMAT_REMOTE_TABLE:
 185       if ((ret = fetchw (as, a, addr, &di->u.rti.name_ptr, arg)) < 0
 186           || (ret = fetchw (as, a, addr, &di->u.rti.segbase, arg)) < 0
 187           || (ret = fetchw (as, a, addr, &di->u.rti.table_len, arg)) < 0
 188           || (ret = fetchw (as, a, addr, &di->u.rti.table_data, arg)) < 0)
 189         goto out;
 190       break;
 191
 192     default:
 193       ret = -UNW_ENOINFO;
 194       goto out;
 195     }
 196   return 0;
 197
 198  out:
 199   free_dyn_info (di);
 200   return ret;
 201 }
 202
 203 HIDDEN int
 204 unwi_dyn_remote_find_proc_info (unw_addr_space_t as, unw_word_t ip,
 205                                 unw_proc_info_t *pi,
 206                                 int need_unwind_info, void *arg)
 207 {
 208   unw_accessors_t *a = unw_get_accessors (as);
 209   unw_word_t dyn_list_addr, addr, next_addr, gen1, gen2, start_ip, end_ip;
 210   unw_dyn_info_t *di = NULL;
 211   int ret;
 212
 213   if (as->dyn_info_list_addr)
 214     dyn_list_addr = as->dyn_info_list_addr;
 215   else
 216     {
 217       if ((*a->get_dyn_info_list_addr) (as, &dyn_list_addr, arg) < 0)
 218         return -UNW_ENOINFO;
 219       if (as->caching_policy != UNW_CACHE_NONE)
 220         as->dyn_info_list_addr = dyn_list_addr;
 221     }
 222
 223   do
 224     {
 225       addr = dyn_list_addr;
 226
 227       ret = -UNW_ENOINFO;
 228
 229       if (fetchw (as, a, &addr, &gen1, arg) < 0
 230           || fetchw (as, a, &addr, &next_addr, arg) < 0)
 231         return ret;
 232
 233       for (addr = next_addr; addr != 0; addr = next_addr)
 234         {
 235           if (fetchw (as, a, &addr, &next_addr, arg) < 0)
 236             goto recheck;       /* only fail if generation # didn't change */
 237
 238           addr += WSIZE;        /* skip over prev_addr */
 239
 240           if (fetchw (as, a, &addr, &start_ip, arg) < 0
 241               || fetchw (as, a, &addr, &end_ip, arg) < 0)
 242             goto recheck;       /* only fail if generation # didn't change */
 243
 244           if (ip >= start_ip && ip < end_ip)
 245             {
 246               if (!di)
 247                 di = calloc (1, sizeof (*di));
 248
 249               di->start_ip = start_ip;
 250               di->end_ip = end_ip;
 251
 252               if (fetchw (as, a, &addr, &di->gp, arg) < 0
 253                   || fetch32 (as, a, &addr, &di->format, arg) < 0)
 254                 goto recheck;   /* only fail if generation # didn't change */
 255
 256               addr += 4;        /* skip over padding */
 257
 258               if (need_unwind_info
 259                   && intern_dyn_info (as, a, &addr, di, arg) < 0)
 260                 goto recheck;   /* only fail if generation # didn't change */
 261
 262               if (unwi_extract_dynamic_proc_info (as, ip, pi, di,
 263                                                   need_unwind_info, arg) < 0)
 264                 {
 265                   free_dyn_info (di);
 266                   goto recheck; /* only fail if generation # didn't change */
 267                 }
 268               ret = 0;  /* OK, found it */
 269               break;
 270             }
 271         }
 272
 273       /* Re-check generation number to ensure the data we have is
 274          consistent.  */
 275     recheck:
 276       addr = dyn_list_addr;
 277       if (fetchw (as, a, &addr, &gen2, arg) < 0)
 278         return ret;
 279     }
 280   while (gen1 != gen2);
 281
 282   if (ret < 0 && di)
 283     free (di);
 284
 285   return ret;
 286 }
 287
 288 HIDDEN void
 289 unwi_dyn_remote_put_unwind_info (unw_addr_space_t as, unw_proc_info_t *pi,
 290                                  void *arg)
 291 {
 292   if (!pi->unwind_info)
 293     return;
 294
 295   free_dyn_info (pi->unwind_info);
 296   free (pi->unwind_info);
 297   pi->unwind_info = NULL;
 298 }
 299
 300 /* Returns 1 if the cache is up-to-date or -1 if the cache contained
 301    stale data and had to be flushed.  */
 302
 303 HIDDEN int
 304 unwi_dyn_validate_cache (unw_addr_space_t as, void *arg)
 305 {
 306   unw_word_t addr, gen;
 307   unw_accessors_t *a;
 308
 309   if (!as->dyn_info_list_addr)
 310     /* If we don't have the dyn_info_list_addr, we don't have anything
 311        in the cache.  */
 312     return 0;
 313
 314   a = unw_get_accessors (as);
 315   addr = as->dyn_info_list_addr;
 316
 317   if (fetchw (as, a, &addr, &gen, arg) < 0)
 318     return 1;
 319
 320   if (gen == as->dyn_generation)
 321     return 1;
 322
 323   unw_flush_cache (as, 0, 0);
 324   as->dyn_generation = gen;
 325   return -1;
 326 }