nptl_db/fetch-value.c

   1 /* Helper routines for libthread_db.
   2    Copyright (C) 2003-2014 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 #include <stdint.h>
  23
  24 td_err_e
  25 _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep, int sizep_name)
  26 {
  27   if (*sizep == 0)
  28     {
  29       psaddr_t descptr;
  30       ps_err_e err = td_lookup (ta->ph, sizep_name, &descptr);
  31       if (err == PS_NOSYM)
  32         return TD_NOCAPAB;
  33       if (err == PS_OK)
  34         err = ps_pdread (ta->ph, descptr, sizep, sizeof *sizep);
  35       if (err != PS_OK)
  36         return TD_ERR;
  37       if (*sizep & 0xff000000U)
  38         *sizep = bswap_32 (*sizep);
  39     }
  40   return TD_OK;
  41 }
  42
  43 td_err_e
  44 _td_locate_field (td_thragent_t *ta,
  45                   db_desc_t desc, int descriptor_name,
  46                   psaddr_t idx, psaddr_t *address)
  47 {
  48   uint32_t elemsize;
  49
  50   if (DB_DESC_SIZE (desc) == 0)
  51     {
  52       /* Read the information about this field from the inferior.  */
  53       psaddr_t descptr;
  54       ps_err_e err = td_lookup (ta->ph, descriptor_name, &descptr);
  55       if (err == PS_NOSYM)
  56         return TD_NOCAPAB;
  57       if (err == PS_OK)
  58         err = ps_pdread (ta->ph, descptr, desc, DB_SIZEOF_DESC);
  59       if (err != PS_OK)
  60         return TD_ERR;
  61       if (DB_DESC_SIZE (desc) == 0)
  62         return TD_DBERR;
  63       if (DB_DESC_SIZE (desc) & 0xff000000U)
  64         {
  65           /* Byte-swap these words, though we leave the size word
  66              in native order as the handy way to distinguish.  */
  67           DB_DESC_OFFSET (desc) = bswap_32 (DB_DESC_OFFSET (desc));
  68           DB_DESC_NELEM (desc) = bswap_32 (DB_DESC_NELEM (desc));
  69         }
  70     }
  71
  72   if (idx != 0 && idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
  73     /* This is an internal indicator to callers with nonzero IDX
  74        that the IDX value is too big.  */
  75     return TD_NOAPLIC;
  76
  77   elemsize = DB_DESC_SIZE (desc);
  78   if (elemsize & 0xff000000U)
  79     elemsize = bswap_32 (elemsize);
  80
  81   *address += (int32_t) DB_DESC_OFFSET (desc);
  82   *address += (elemsize / 8 * (idx - (psaddr_t) 0));
  83   return TD_OK;
  84 }
  85
  86 td_err_e
  87 _td_fetch_value (td_thragent_t *ta,
  88                  db_desc_t desc, int descriptor_name,
  89                  psaddr_t idx, psaddr_t address,
  90                  psaddr_t *result)
  91 {
  92   ps_err_e err;
  93   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
  94   if (terr != TD_OK)
  95     return terr;
  96
  97   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
  98     {
  99       uint8_t value;
 100       err = ps_pdread (ta->ph, address, &value, sizeof value);
 101       *result = (psaddr_t) 0 + value;
 102     }
 103   else if (DB_DESC_SIZE (desc) == 32)
 104     {
 105       uint32_t value;
 106       err = ps_pdread (ta->ph, address, &value, sizeof value);
 107       *result = (psaddr_t) 0 + value;
 108     }
 109   else if (DB_DESC_SIZE (desc) == 64)
 110     {
 111       uint64_t value;
 112       if (sizeof (psaddr_t) < 8)
 113         return TD_NOCAPAB;
 114       err = ps_pdread (ta->ph, address, &value, sizeof value);
 115       *result = (psaddr_t) 0 + value;
 116     }
 117   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 118     {
 119       uint32_t value;
 120       err = ps_pdread (ta->ph, address, &value, sizeof value);
 121       value = bswap_32 (value);
 122       *result = (psaddr_t) 0 + value;
 123     }
 124   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 125     {
 126       uint64_t value;
 127       if (sizeof (psaddr_t) < 8)
 128         return TD_NOCAPAB;
 129       err = ps_pdread (ta->ph, address, &value, sizeof value);
 130       value = bswap_64 (value);
 131       *result = (psaddr_t) 0 + value;
 132     }
 133   else
 134     return TD_DBERR;
 135
 136   return err == PS_OK ? TD_OK : TD_ERR;
 137 }
 138
 139
 140 td_err_e
 141 _td_store_value (td_thragent_t *ta,
 142                  uint32_t desc[2], int descriptor_name, psaddr_t idx,
 143                  psaddr_t address, psaddr_t widened_value)
 144 {
 145   ps_err_e err;
 146   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 147   if (terr != TD_OK)
 148     return terr;
 149
 150   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 151     {
 152       uint8_t value = widened_value - (psaddr_t) 0;
 153       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 154     }
 155   else if (DB_DESC_SIZE (desc) == 32)
 156     {
 157       uint32_t value = widened_value - (psaddr_t) 0;
 158       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 159     }
 160   else if (DB_DESC_SIZE (desc) == 64)
 161     {
 162       uint64_t value = widened_value - (psaddr_t) 0;
 163       if (sizeof (psaddr_t) < 8)
 164         return TD_NOCAPAB;
 165       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 166     }
 167   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 168     {
 169       uint32_t value = widened_value - (psaddr_t) 0;
 170       value = bswap_32 (value);
 171       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 172     }
 173   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 174     {
 175       uint64_t value = widened_value - (psaddr_t) 0;
 176       if (sizeof (psaddr_t) < 8)
 177         return TD_NOCAPAB;
 178       value = bswap_64 (value);
 179       err = ps_pdwrite (ta->ph, address, &value, sizeof value);
 180     }
 181   else
 182     return TD_DBERR;
 183
 184   return err == PS_OK ? TD_OK : TD_ERR;
 185 }
 186
 187 td_err_e
 188 _td_fetch_value_local (td_thragent_t *ta,
 189                        db_desc_t desc, int descriptor_name, psaddr_t idx,
 190                        void *address,
 191                        psaddr_t *result)
 192 {
 193   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 194   if (terr != TD_OK)
 195     return terr;
 196
 197   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 198     {
 199       uint8_t value;
 200       memcpy (&value, address, sizeof value);
 201       *result = (psaddr_t) 0 + value;
 202     }
 203   else if (DB_DESC_SIZE (desc) == 32)
 204     {
 205       uint32_t value;
 206       memcpy (&value, address, sizeof value);
 207       *result = (psaddr_t) 0 + value;
 208     }
 209   else if (DB_DESC_SIZE (desc) == 64)
 210     {
 211       uint64_t value;
 212       if (sizeof (psaddr_t) < 8)
 213         return TD_NOCAPAB;
 214       memcpy (&value, address, sizeof value);
 215       *result = (psaddr_t) 0 + value;
 216     }
 217   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 218     {
 219       uint32_t value;
 220       memcpy (&value, address, sizeof value);
 221       value = bswap_32 (value);
 222       *result = (psaddr_t) 0 + value;
 223     }
 224   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 225     {
 226       uint64_t value;
 227       if (sizeof (psaddr_t) < 8)
 228         return TD_NOCAPAB;
 229       memcpy (&value, address, sizeof value);
 230       value = bswap_64 (value);
 231       *result = (psaddr_t) 0 + value;
 232     }
 233   else
 234     return TD_DBERR;
 235
 236   return TD_OK;
 237 }
 238
 239
 240 td_err_e
 241 _td_store_value_local (td_thragent_t *ta,
 242                        uint32_t desc[2], int descriptor_name, psaddr_t idx,
 243                        void *address, psaddr_t widened_value)
 244 {
 245   td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
 246   if (terr != TD_OK)
 247     return terr;
 248
 249   if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
 250     {
 251       uint8_t value = widened_value - (psaddr_t) 0;
 252       memcpy (address, &value, sizeof value);
 253     }
 254   else if (DB_DESC_SIZE (desc) == 32)
 255     {
 256       uint32_t value = widened_value - (psaddr_t) 0;
 257       memcpy (address, &value, sizeof value);
 258     }
 259   else if (DB_DESC_SIZE (desc) == 64)
 260     {
 261       uint64_t value = widened_value - (psaddr_t) 0;
 262       if (sizeof (psaddr_t) < 8)
 263         return TD_NOCAPAB;
 264       memcpy (address, &value, sizeof value);
 265     }
 266   else if (DB_DESC_SIZE (desc) == bswap_32 (32))
 267     {
 268       uint32_t value = widened_value - (psaddr_t) 0;
 269       value = bswap_32 (value);
 270       memcpy (address, &value, sizeof value);
 271     }
 272   else if (DB_DESC_SIZE (desc) == bswap_32 (64))
 273     {
 274       uint64_t value = widened_value - (psaddr_t) 0;
 275       if (sizeof (psaddr_t) < 8)
 276         return TD_NOCAPAB;
 277       value = bswap_64 (value);
 278       memcpy (address, &value, sizeof value);
 279     }
 280   else
 281     return TD_DBERR;
 282
 283   return TD_OK;
 284 }