nptl_db/fetch-value.c

   1 /* Helper routines for libthread_db.
   2    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include "thread_dbP.h"
  20 #include <byteswap.h>
  21 #include <assert.h>
  22
  23 td_err_e
  24 _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep, int sizep_name)
  25 {
  26   if (*sizep == 0)
  27     {
  28       psaddr_t descptr;
  29       ps_err_e err = td_lookup (ta->ph, sizep_name, &descptr);
  30       if (err == PS_NOSYM)
  31         return TD_NOCAPAB;
  32       if (err == PS_OK)
  33         err = ps_pdread (ta->ph, descptr, sizep, sizeof *sizep);
  34       if (err != PS_OK)
  35         return TD_ERR;
  36       if (*sizep & 0xff000000U)
  37         *sizep = bswap_32 (*sizep);
  38     }
  39   return TD_OK;
  40 }
  41
  42 td_err_e
  43 _td_locate_field (td_thragent_t *ta,
  44                   db_desc_t desc, int descriptor_name,
  45                   psaddr_t idx, psaddr_t *address)
  46 {
  47   uint32_t elemsize;
  48
  49   if (DB_DESC_SIZE (desc) == 0)
  50     {
  51       /* Read the information about this field from the inferior.  */
  52       psaddr_t descptr;
  53       ps_err_e err = td_lookup (ta->ph, descriptor_name, &descptr);
  54       if (err == PS_NOSYM)
  55         return TD_NOCAPAB;
  56       if (err == PS_OK)
  57         err = ps_pdread (ta->ph, descptr, desc, DB_SIZEOF_DESC);
  58       if (err != PS_OK)
  59         return TD_ERR;
  60       if (DB_DESC_SIZE (desc) == 0)
  61         return TD_DBERR;
  62       if (DB_DESC_SIZE (desc) & 0xff000000U)
  63         {
  64           /* Byte-swap these words, though we leave the size word
  65              in native order as the handy way to distinguish.  */
  66           DB_DESC_OFFSET (desc) = bswap_32 (DB_DESC_OFFSET (desc));
  67           DB_DESC_NELEM (desc) = bswap_32 (DB_DESC_NELEM (desc));
  68         }
  69     }
  70
  71   if (idx != 0 && idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
  72     /* This is an internal indicator to callers with nonzero IDX
  73        that the IDX value is too big.  */
  74     return TD_NOAPLIC;
  75
  76   elemsize = DB_DESC_SIZE (desc);
  77   if (elemsize & 0xff000000U)
  78     elemsize = bswap_32 (elemsize);
  79
  80   *address += (int32_t) DB_DESC_OFFSET (desc);
  81   *address += (elemsize / 8 * (idx - (psaddr_t) 0));
  82   return TD_OK;
  83 }
  84
  85 td_err_e
  86 _td_fetch_value (td_thragent_t *ta,
  87                  db_desc_t desc, int descriptor_name,
  88                  psaddr_t idx, psaddr_t address,
  89                  psaddr_t *result)
  90 {
  91   ps_err_e err;
  92   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
  93   if (terr != TD_OK)
  94     return terr;
  95
  96   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
  97     {
  98       uint8_t value;
  99       err = ps_pdread (ta->ph, address, &value, sizeof value);
 100       *result = (psaddr_t) 0 + value;
 101     }
 102   else if (DB_DESC_SIZE (desc) == 32)
 103     {
 104       uint32_t value;
 105       err = ps_pdread (ta->ph, address, &value, sizeof value);
 106       *result = (psaddr_t) 0 + value;
 107     }
 108   else if (DB_DESC_SIZE (desc) == 64)
 109     {
 110       uint64_t value;
 111       if (sizeof (psaddr_t) < 8)
 112         return TD_NOCAPAB;
 113       err = ps_pdread (ta->ph, address, &value, sizeof value);
 114       *result = (psaddr_t) 0 + value;
 115     }
 116   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 117     {
 118       uint32_t value;
 119       err = ps_pdread (ta->ph, address, &value, sizeof value);
 120       value = bswap_32 (value);
 121       *result = (psaddr_t) 0 + value;
 122     }
 123   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 124     {
 125       uint64_t value;
 126       if (sizeof (psaddr_t) < 8)
 127         return TD_NOCAPAB;
 128       err = ps_pdread (ta->ph, address, &value, sizeof value);
 129       value = bswap_64 (value);
 130       *result = (psaddr_t) 0 + value;
 131     }
 132   else
 133     return TD_DBERR;
 134
 135   return err == PS_OK ? TD_OK : TD_ERR;
 136 }
 137
 138
 139 td_err_e
 140 _td_store_value (td_thragent_t *ta,
 141                  uint32_t desc[2], int descriptor_name, psaddr_t idx,
 142                  psaddr_t address, psaddr_t widened_value)
 143 {
 144   ps_err_e err;
 145   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 146   if (terr != TD_OK)
 147     return terr;
 148
 149   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 150     {
 151       uint8_t value = widened_value - (psaddr_t) 0;
 152       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 153     }
 154   else if (DB_DESC_SIZE (desc) == 32)
 155     {
 156       uint32_t value = widened_value - (psaddr_t) 0;
 157       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 158     }
 159   else if (DB_DESC_SIZE (desc) == 64)
 160     {
 161       uint64_t value = widened_value - (psaddr_t) 0;
 162       if (sizeof (psaddr_t) < 8)
 163         return TD_NOCAPAB;
 164       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 165     }
 166   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 167     {
 168       uint32_t value = widened_value - (psaddr_t) 0;
 169       value = bswap_32 (value);
 170       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 171     }
 172   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 173     {
 174       uint64_t value = widened_value - (psaddr_t) 0;
 175       if (sizeof (psaddr_t) < 8)
 176         return TD_NOCAPAB;
 177       value = bswap_64 (value);
 178       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 179     }
 180   else
 181     return TD_DBERR;
 182
 183   return err == PS_OK ? TD_OK : TD_ERR;
 184 }
 185
 186 td_err_e
 187 _td_fetch_value_local (td_thragent_t *ta,
 188                        db_desc_t desc, int descriptor_name, psaddr_t idx,
 189                        void *address,
 190                        psaddr_t *result)
 191 {
 192   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 193   if (terr != TD_OK)
 194     return terr;
 195
 196   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 197     {
 198       uint8_t value;
 199       memcpy (&value, address, sizeof value);
 200       *result = (psaddr_t) 0 + value;
 201     }
 202   else if (DB_DESC_SIZE (desc) == 32)
 203     {
 204       uint32_t value;
 205       memcpy (&value, address, sizeof value);
 206       *result = (psaddr_t) 0 + value;
 207     }
 208   else if (DB_DESC_SIZE (desc) == 64)
 209     {
 210       uint64_t value;
 211       if (sizeof (psaddr_t) < 8)
 212         return TD_NOCAPAB;
 213       memcpy (&value, address, sizeof value);
 214       *result = (psaddr_t) 0 + value;
 215     }
 216   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 217     {
 218       uint32_t value;
 219       memcpy (&value, address, sizeof value);
 220       value = bswap_32 (value);
 221       *result = (psaddr_t) 0 + value;
 222     }
 223   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 224     {
 225       uint64_t value;
 226       if (sizeof (psaddr_t) < 8)
 227         return TD_NOCAPAB;
 228       memcpy (&value, address, sizeof value);
 229       value = bswap_64 (value);
 230       *result = (psaddr_t) 0 + value;
 231     }
 232   else
 233     return TD_DBERR;
 234
 235   return TD_OK;
 236 }
 237
 238
 239 td_err_e
 240 _td_store_value_local (td_thragent_t *ta,
 241                        uint32_t desc[2], int descriptor_name, psaddr_t idx,
 242                        void *address, psaddr_t widened_value)
 243 {
 244   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 245   if (terr != TD_OK)
 246     return terr;
 247
 248   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 249     {
 250       uint8_t value = widened_value - (psaddr_t) 0;
 251       memcpy (address, &value, sizeof value);
 252     }
 253   else if (DB_DESC_SIZE (desc) == 32)
 254     {
 255       uint32_t value = widened_value - (psaddr_t) 0;
 256       memcpy (address, &value, sizeof value);
 257     }
 258   else if (DB_DESC_SIZE (desc) == 64)
 259     {
 260       uint64_t value = widened_value - (psaddr_t) 0;
 261       if (sizeof (psaddr_t) < 8)
 262         return TD_NOCAPAB;
 263       memcpy (address, &value, sizeof value);
 264     }
 265   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 266     {
 267       uint32_t value = widened_value - (psaddr_t) 0;
 268       value = bswap_32 (value);
 269       memcpy (address, &value, sizeof value);
 270     }
 271   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 272     {
 273       uint64_t value = widened_value - (psaddr_t) 0;
 274       if (sizeof (psaddr_t) < 8)
 275         return TD_NOCAPAB;
 276       value = bswap_64 (value);
 277       memcpy (address, &value, sizeof value);
 278     }
 279   else
 280     return TD_DBERR;
 281
 282   return TD_OK;
 283 }