contrib/elftoolchain/libdwarf/libdwarf_sections.c

   1 /*-
   2  * Copyright (c) 2010 Kai Wang
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include "_libdwarf.h"
  28
  29 ELFTC_VCSID("$Id: libdwarf_sections.c 3041 2014-05-18 15:11:03Z kaiwang27 $");
  30
  31 #define _SECTION_INIT_SIZE      128
  32
  33 int
  34 _dwarf_section_init(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp, const char *name,
  35     int pseudo, Dwarf_Error *error)
  36 {
  37         Dwarf_P_Section ds;
  38
  39         assert(dbg != NULL && dsp != NULL && name != NULL);
  40
  41         if ((ds = calloc(1, sizeof(struct _Dwarf_P_Section))) == NULL) {
  42                 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
  43                 return (DW_DLE_MEMORY);
  44         }
  45
  46         if ((ds->ds_name = strdup(name)) == NULL) {
  47                 free(ds);
  48                 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
  49                 return (DW_DLE_MEMORY);
  50         }
  51
  52         if (!pseudo) {
  53                 ds->ds_cap = _SECTION_INIT_SIZE;
  54                 if ((ds->ds_data = malloc((size_t) ds->ds_cap)) == NULL) {
  55                         free(ds->ds_name);
  56                         free(ds);
  57                         DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
  58                         return (DW_DLE_MEMORY);
  59                 }
  60                 STAILQ_INSERT_TAIL(&dbg->dbgp_seclist, ds, ds_next);
  61                 dbg->dbgp_seccnt++;
  62         }
  63
  64         *dsp = ds;
  65
  66         return (DW_DLE_NONE);
  67 }
  68
  69 void
  70 _dwarf_section_free(Dwarf_P_Debug dbg, Dwarf_P_Section *dsp)
  71 {
  72         Dwarf_P_Section ds, tds;
  73
  74         assert(dbg != NULL && dsp != NULL);
  75
  76         if (*dsp == NULL)
  77                 return;
  78
  79         STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
  80                 if (ds == *dsp) {
  81                         STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
  82                             ds_next);
  83                         dbg->dbgp_seccnt--;
  84                         break;
  85                 }
  86         }
  87         ds = *dsp;
  88         if (ds->ds_name)
  89                 free(ds->ds_name);
  90         if (ds->ds_data)
  91                 free(ds->ds_data);
  92         free(ds);
  93         *dsp = NULL;
  94 }
  95
  96 int
  97 _dwarf_pro_callback(Dwarf_P_Debug dbg, char *name, int size,
  98     Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
  99     Dwarf_Unsigned info, Dwarf_Unsigned *symndx, int *error)
 100 {
 101         int e, ret, isymndx;
 102
 103         assert(dbg != NULL && name != NULL && symndx != NULL);
 104
 105         if (dbg->dbgp_func_b)
 106                 ret = dbg->dbgp_func_b(name, size, type, flags, link, info,
 107                     symndx, &e);
 108         else {
 109                 ret = dbg->dbgp_func(name, size, type, flags, link, info,
 110                     &isymndx, &e);
 111                 *symndx = isymndx;
 112         }
 113         if (ret < 0) {
 114                 if (error)
 115                         *error = e;
 116         }
 117
 118         return (ret);
 119 }
 120
 121 int
 122 _dwarf_section_callback(Dwarf_P_Debug dbg, Dwarf_P_Section ds,
 123     Dwarf_Unsigned type, Dwarf_Unsigned flags, Dwarf_Unsigned link,
 124     Dwarf_Unsigned info, Dwarf_Error *error)
 125 {
 126         int ret, ndx;
 127
 128         ndx = _dwarf_pro_callback(dbg, ds->ds_name, (int) ds->ds_size,
 129             type, flags, link, info, &ds->ds_symndx, NULL);
 130         if (ndx < 0) {
 131                 ret = DW_DLE_ELF_SECT_ERR;
 132                 DWARF_SET_ERROR(dbg, error, ret);
 133                 return (ret);
 134         }
 135         ds->ds_ndx = ndx;
 136
 137         return (DW_DLE_NONE);
 138 }
 139
 140 int
 141 _dwarf_generate_sections(Dwarf_P_Debug dbg, Dwarf_Error *error)
 142 {
 143         int ret;
 144
 145         /* Produce .debug_info section. */
 146         if ((ret = _dwarf_info_gen(dbg, error)) != DW_DLE_NONE)
 147                 return (ret);
 148
 149         /* Produce .debug_abbrev section. */
 150         if ((ret = _dwarf_abbrev_gen(dbg, error)) != DW_DLE_NONE)
 151                 return (ret);
 152
 153         /* Produce .debug_line section. */
 154         if ((ret = _dwarf_lineno_gen(dbg, error)) != DW_DLE_NONE)
 155                 return (ret);
 156
 157         /* Produce .debug_frame section. */
 158         if ((ret = _dwarf_frame_gen(dbg, error)) != DW_DLE_NONE)
 159                 return (ret);
 160
 161         /* Produce .debug_aranges section. */
 162         if ((ret = _dwarf_arange_gen(dbg, error)) != DW_DLE_NONE)
 163                 return (ret);
 164
 165         /* Produce .debug_macinfo section. */
 166         if ((ret = _dwarf_macinfo_gen(dbg, error)) != DW_DLE_NONE)
 167                 return (ret);
 168
 169         /* Produce .debug_pubnames section. */
 170         if ((ret = _dwarf_nametbl_gen(dbg, ".debug_pubnames", dbg->dbgp_pubs,
 171             error)) != DW_DLE_NONE)
 172                 return (ret);
 173
 174         /* Produce .debug_weaknames section. */
 175         if ((ret = _dwarf_nametbl_gen(dbg, ".debug_weaknames", dbg->dbgp_weaks,
 176             error)) != DW_DLE_NONE)
 177                 return (ret);
 178
 179         /* Produce .debug_funcnames section. */
 180         if ((ret = _dwarf_nametbl_gen(dbg, ".debug_funcnames", dbg->dbgp_funcs,
 181             error)) != DW_DLE_NONE)
 182                 return (ret);
 183
 184         /* Produce .debug_typenames section. */
 185         if ((ret = _dwarf_nametbl_gen(dbg, ".debug_typenames", dbg->dbgp_types,
 186             error)) != DW_DLE_NONE)
 187                 return (ret);
 188
 189         /* Produce .debug_varnames section. */
 190         if ((ret = _dwarf_nametbl_gen(dbg, ".debug_varnames", dbg->dbgp_vars,
 191             error)) != DW_DLE_NONE)
 192                 return (ret);
 193
 194         /* Produce .debug_str section. */
 195         if ((ret = _dwarf_strtab_gen(dbg, error)) != DW_DLE_NONE)
 196                 return (ret);
 197
 198         /* Finally, update and generate all relocation sections. */
 199         if ((ret = _dwarf_reloc_gen(dbg, error)) != DW_DLE_NONE)
 200                 return (ret);
 201
 202         /* Set section/relocation iterator to the first element. */
 203         dbg->dbgp_secpos = STAILQ_FIRST(&dbg->dbgp_seclist);
 204         dbg->dbgp_drspos = STAILQ_FIRST(&dbg->dbgp_drslist);
 205
 206         return (DW_DLE_NONE);
 207 }
 208
 209 Dwarf_Section *
 210 _dwarf_find_section(Dwarf_Debug dbg, const char *name)
 211 {
 212         Dwarf_Section *ds;
 213         Dwarf_Half i;
 214
 215         assert(dbg != NULL && name != NULL);
 216
 217         for (i = 0; i < dbg->dbg_seccnt; i++) {
 218                 ds = &dbg->dbg_section[i];
 219                 if (ds->ds_name != NULL && !strcmp(ds->ds_name, name))
 220                         return (ds);
 221         }
 222
 223         return (NULL);
 224 }
 225
 226 Dwarf_Section *
 227 _dwarf_find_next_types_section(Dwarf_Debug dbg, Dwarf_Section *ds)
 228 {
 229
 230         assert(dbg != NULL);
 231
 232         if (ds == NULL)
 233                 return (_dwarf_find_section(dbg, ".debug_types"));
 234
 235         assert(ds->ds_name != NULL);
 236
 237         do {
 238                 ds++;
 239                 if (ds->ds_name != NULL &&
 240                     !strcmp(ds->ds_name, ".debug_types"))
 241                         return (ds);
 242         } while (ds->ds_name != NULL);
 243
 244         return (NULL);
 245 }
 246
 247 Dwarf_P_Section
 248 _dwarf_pro_find_section(Dwarf_P_Debug dbg, const char *name)
 249 {
 250         Dwarf_P_Section ds;
 251
 252         assert(dbg != NULL && name != NULL);
 253
 254         STAILQ_FOREACH(ds, &dbg->dbgp_seclist, ds_next) {
 255                 if (ds->ds_name != NULL && !strcmp(ds->ds_name ,name))
 256                         return (ds);
 257         }
 258
 259         return (NULL);
 260 }
 261
 262 void
 263 _dwarf_section_cleanup(Dwarf_P_Debug dbg)
 264 {
 265         Dwarf_P_Section ds, tds;
 266
 267         assert(dbg != NULL && dbg->dbg_mode == DW_DLC_WRITE);
 268
 269         STAILQ_FOREACH_SAFE(ds, &dbg->dbgp_seclist, ds_next, tds) {
 270                 STAILQ_REMOVE(&dbg->dbgp_seclist, ds, _Dwarf_P_Section,
 271                     ds_next);
 272                 if (ds->ds_name)
 273                         free(ds->ds_name);
 274                 if (ds->ds_data)
 275                         free(ds->ds_data);
 276                 free(ds);
 277         }
 278         dbg->dbgp_seccnt = 0;
 279         dbg->dbgp_secpos = 0;
 280 }