nptl_db/thread_dbP.h

   1 /* Private header for thread debug library
   2    Copyright (C) 2003, 2004, 2007 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _THREAD_DBP_H
  21 #define _THREAD_DBP_H   1
  22
  23 #include <stdbool.h>
  24 #include <stdint.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <assert.h>
  29 #include "proc_service.h"
  30 #include "thread_db.h"
  31 #include "../nptl/pthreadP.h"   /* This is for *_BITMASK only.  */
  32
  33 /* Indeces for the symbol names.  */
  34 enum
  35   {
  36 # define DB_STRUCT(type)                SYM_SIZEOF_##type,
  37 # define DB_STRUCT_FIELD(type, field)   SYM_##type##_FIELD_##field,
  38 # define DB_SYMBOL(name)                SYM_##name,
  39 # define DB_FUNCTION(name)              SYM_##name,
  40 # define DB_VARIABLE(name)              SYM_##name, SYM_DESC_##name,
  41 # include "structs.def"
  42 # undef DB_STRUCT
  43 # undef DB_STRUCT_FIELD
  44 # undef DB_SYMBOL
  45 # undef DB_FUNCTION
  46 # undef DB_VARIABLE
  47
  48     SYM_TH_UNIQUE_CONST_THREAD_AREA,
  49     SYM_TH_UNIQUE_REGISTER64,
  50     SYM_TH_UNIQUE_REGISTER32,
  51     SYM_TH_UNIQUE_REGISTER64_THREAD_AREA,
  52     SYM_TH_UNIQUE_REGISTER32_THREAD_AREA,
  53
  54     SYM_NUM_MESSAGES
  55   };
  56
  57
  58 /* Comment out the following for less verbose output.  */
  59 #ifndef NDEBUG
  60 # define LOG(c) if (__td_debug) write (2, c "\n", strlen (c "\n"))
  61 extern int __td_debug attribute_hidden;
  62 #else
  63 # define LOG(c)
  64 #endif
  65
  66
  67 #define DB_DESC_SIZE(desc)      ((desc)[0])
  68 #define DB_DESC_NELEM(desc)     ((desc)[1])
  69 #define DB_DESC_OFFSET(desc)    ((desc)[2])
  70 #define DB_SIZEOF_DESC          (3 * sizeof (uint32_t))
  71 #define DB_DEFINE_DESC(name, size, nelem, offset) \
  72   const uint32_t name[3] = { (size), (nelem), (offset) }
  73 typedef uint32_t db_desc_t[3];
  74
  75
  76 /* Handle for a process.  This type is opaque.  */
  77 struct td_thragent
  78 {
  79   /* Chain on the list of all agent structures.  */
  80   list_t list;
  81
  82   /* Delivered by the debugger and we have to pass it back in the
  83      proc callbacks.  */
  84   struct ps_prochandle *ph;
  85
  86   /* Cached values read from the inferior.  */
  87 # define DB_STRUCT(type) \
  88   uint32_t ta_sizeof_##type;
  89 # define DB_STRUCT_FIELD(type, field) \
  90   db_desc_t ta_field_##type##_##field;
  91 # define DB_SYMBOL(name) \
  92   psaddr_t ta_addr_##name;
  93 # define DB_FUNCTION(name) \
  94   psaddr_t ta_addr_##name;
  95 # define DB_VARIABLE(name) \
  96   psaddr_t ta_addr_##name; \
  97   db_desc_t ta_var_##name;
  98 # include "structs.def"
  99 # undef DB_STRUCT
 100 # undef DB_STRUCT_FIELD
 101 # undef DB_FUNCTION
 102 # undef DB_SYMBOL
 103 # undef DB_VARIABLE
 104
 105   /* The method of locating a thread's th_unique value.  */
 106   enum
 107     {
 108       ta_howto_unknown,
 109       ta_howto_reg,
 110       ta_howto_reg_thread_area,
 111       ta_howto_const_thread_area
 112     } ta_howto;
 113   union
 114   {
 115     uint32_t const_thread_area; /* Constant argument to ps_get_thread_area.  */
 116     /* These are as if the descriptor of the field in prregset_t,
 117        but DB_DESC_NELEM is overloaded as follows: */
 118     db_desc_t reg;              /* Signed bias applied to register value.  */
 119     db_desc_t reg_thread_area;  /* Bits to scale down register value.  */
 120   } ta_howto_data;
 121 };
 122
 123
 124 /* List of all known descriptors.  */
 125 extern list_t __td_agent_list attribute_hidden;
 126
 127
 128 /* Function used to test for correct thread agent pointer.  */
 129 static inline bool
 130 ta_ok (const td_thragent_t *ta)
 131 {
 132   list_t *runp;
 133
 134   list_for_each (runp, &__td_agent_list)
 135     if (list_entry (runp, td_thragent_t, list) == ta)
 136       return true;
 137
 138   return false;
 139 }
 140
 141
 142 /* Internal wrapper around ps_pglobal_lookup.  */
 143 extern ps_err_e td_lookup (struct ps_prochandle *ps,
 144                            int idx, psaddr_t *sym_addr) attribute_hidden;
 145
 146
 147
 148
 149 /* Store in psaddr_t VAR the address of inferior's symbol NAME.  */
 150 #define DB_GET_SYMBOL(var, ta, name)                                          \
 151   (((ta)->ta_addr_##name == 0                                                 \
 152     && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK)      \
 153    ? TD_ERR : ((var) = (ta)->ta_addr_##name, TD_OK))
 154
 155 /* Store in psaddr_t VAR the value of ((TYPE) PTR)->FIELD[IDX] in the inferior.
 156    A target field smaller than psaddr_t is zero-extended.  */
 157 #define DB_GET_FIELD(var, ta, ptr, type, field, idx) \
 158   _td_fetch_value ((ta), (ta)->ta_field_##type##_##field, \
 159                    SYM_##type##_FIELD_##field, \
 160                    (psaddr_t) 0 + (idx), (ptr), &(var))
 161
 162 #define DB_GET_FIELD_ADDRESS(var, ta, ptr, type, field, idx) \
 163   ((var) = (ptr), _td_locate_field ((ta), (ta)->ta_field_##type##_##field, \
 164                                     SYM_##type##_FIELD_##field, \
 165                                     (psaddr_t) 0 + (idx), &(var)))
 166
 167 extern td_err_e _td_locate_field (td_thragent_t *ta,
 168                                   db_desc_t desc, int descriptor_name,
 169                                   psaddr_t idx,
 170                                   psaddr_t *address) attribute_hidden;
 171
 172
 173 /* Like DB_GET_FIELD, but PTR is a local pointer to a structure that
 174    has already been copied in from the inferior.  */
 175 #define DB_GET_FIELD_LOCAL(var, ta, ptr, type, field, idx) \
 176   _td_fetch_value_local ((ta), (ta)->ta_field_##type##_##field, \
 177                          SYM_##type##_FIELD_##field, \
 178                          (psaddr_t) 0 + (idx), (ptr), &(var))
 179
 180 /* Store in psaddr_t VAR the value of variable NAME[IDX] in the inferior.
 181    A target value smaller than psaddr_t is zero-extended.  */
 182 #define DB_GET_VALUE(var, ta, name, idx)                                      \
 183   (((ta)->ta_addr_##name == 0                                                 \
 184     && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK)      \
 185    ? TD_ERR                                                                   \
 186    : _td_fetch_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name,             \
 187                       (psaddr_t) 0 + (idx), (ta)->ta_addr_##name, &(var)))
 188
 189 /* Helper functions for those.  */
 190 extern td_err_e _td_fetch_value (td_thragent_t *ta,
 191                                  db_desc_t field, int descriptor_name,
 192                                  psaddr_t idx, psaddr_t address,
 193                                  psaddr_t *result) attribute_hidden;
 194 extern td_err_e _td_fetch_value_local (td_thragent_t *ta,
 195                                        db_desc_t field,
 196                                        int descriptor_name,
 197                                        psaddr_t idx, void *address,
 198                                        psaddr_t *result) attribute_hidden;
 199
 200 /* Store psaddr_t VALUE in ((TYPE) PTR)->FIELD[IDX] in the inferior.
 201    A target field smaller than psaddr_t is zero-extended.  */
 202 #define DB_PUT_FIELD(ta, ptr, type, field, idx, value) \
 203   _td_store_value ((ta), (ta)->ta_field_##type##_##field, \
 204                    SYM_##type##_FIELD_##field, \
 205                    (psaddr_t) 0 + (idx), (ptr), (value))
 206
 207 #define DB_PUT_FIELD_LOCAL(ta, ptr, type, field, idx, value) \
 208   _td_store_value_local ((ta), (ta)->ta_field_##type##_##field, \
 209                          SYM_##type##_FIELD_##field, \
 210                          (psaddr_t) 0 + (idx), (ptr), (value))
 211
 212 /* Store psaddr_t VALUE in variable NAME[IDX] in the inferior.
 213    A target field smaller than psaddr_t is zero-extended.  */
 214 #define DB_PUT_VALUE(ta, name, idx, value)                                    \
 215   (((ta)->ta_addr_##name == 0                                                 \
 216     && td_lookup ((ta)->ph, SYM_##name, &(ta)->ta_addr_##name) != PS_OK)      \
 217    ? TD_ERR                                                                   \
 218    : _td_store_value ((ta), (ta)->ta_var_##name, SYM_DESC_##name,             \
 219                       (psaddr_t) 0 + (idx), (ta)->ta_addr_##name, (value)))
 220
 221 /* Helper functions for those.  */
 222 extern td_err_e _td_store_value (td_thragent_t *ta,
 223                                  db_desc_t field, int descriptor_name,
 224                                  psaddr_t idx, psaddr_t address,
 225                                  psaddr_t value) attribute_hidden;
 226 extern td_err_e _td_store_value_local (td_thragent_t *ta,
 227                                        db_desc_t field, int descriptor_name,
 228                                        psaddr_t idx, void *address,
 229                                        psaddr_t value) attribute_hidden;
 230
 231 #define DB_GET_STRUCT(var, ta, ptr, type)                                     \
 232   ({ td_err_e _err = TD_OK;                                                   \
 233      if ((ta)->ta_sizeof_##type == 0)                                         \
 234        _err = _td_check_sizeof ((ta), &(ta)->ta_sizeof_##type,                \
 235                                       SYM_SIZEOF_##type);                     \
 236      if (_err == TD_OK)                                                       \
 237        _err = ps_pdread ((ta)->ph, (ptr),                                     \
 238                          (var) = __alloca ((ta)->ta_sizeof_##type),           \
 239                          (ta)->ta_sizeof_##type)                              \
 240          == PS_OK ? TD_OK : TD_ERR;                                           \
 241      else                                                                     \
 242        (var) = NULL;                                                          \
 243      _err;                                                                    \
 244   })
 245 #define DB_PUT_STRUCT(ta, ptr, type, copy)                                    \
 246   ({ assert ((ta)->ta_sizeof_##type != 0);                                    \
 247      ps_pdwrite ((ta)->ph, (ptr), (copy), (ta)->ta_sizeof_##type)             \
 248        == PS_OK ? TD_OK : TD_ERR;                                             \
 249   })
 250
 251 extern td_err_e _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep,
 252                                   int sizep_name) attribute_hidden;
 253
 254 extern td_err_e __td_ta_lookup_th_unique (const td_thragent_t *ta,
 255                                           lwpid_t lwpid, td_thrhandle_t *th);
 256
 257 #endif /* thread_dbP.h */