LCOV - code coverage report
Current view: top level - libdw - dwarf_begin_elf.c (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 164 250 65.6 %
Date: 2023-10-03 22:29:04 Functions: 6 7 85.7 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 113 176 64.2 %

           Branch data     Line data    Source code
       1                 :            : /* Create descriptor from ELF descriptor for processing file.
       2                 :            :    Copyright (C) 2002-2011, 2014, 2015, 2017, 2018 Red Hat, Inc.
       3                 :            :    Copyright (C) 2023, Mark J. Wielaard <mark@klomp.org>
       4                 :            :    This file is part of elfutils.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <system.h>
      35                 :            : 
      36                 :            : #include <assert.h>
      37                 :            : #include <stdbool.h>
      38                 :            : #include <stddef.h>
      39                 :            : #include <stdlib.h>
      40                 :            : #include <stdio.h>
      41                 :            : #include <string.h>
      42                 :            : #include <sys/types.h>
      43                 :            : #include <sys/stat.h>
      44                 :            : #include <fcntl.h>
      45                 :            : 
      46                 :            : #include "libelfP.h"
      47                 :            : #include "libdwP.h"
      48                 :            : 
      49                 :            : 
      50                 :            : /* Section names.  (Note .debug_str_offsets is the largest 19 chars.)  */
      51                 :            : static const char dwarf_scnnames[IDX_last][19] =
      52                 :            : {
      53                 :            :   [IDX_debug_info] = ".debug_info",
      54                 :            :   [IDX_debug_types] = ".debug_types",
      55                 :            :   [IDX_debug_abbrev] = ".debug_abbrev",
      56                 :            :   [IDX_debug_addr] = ".debug_addr",
      57                 :            :   [IDX_debug_aranges] = ".debug_aranges",
      58                 :            :   [IDX_debug_line] = ".debug_line",
      59                 :            :   [IDX_debug_line_str] = ".debug_line_str",
      60                 :            :   [IDX_debug_frame] = ".debug_frame",
      61                 :            :   [IDX_debug_loc] = ".debug_loc",
      62                 :            :   [IDX_debug_loclists] = ".debug_loclists",
      63                 :            :   [IDX_debug_pubnames] = ".debug_pubnames",
      64                 :            :   [IDX_debug_str] = ".debug_str",
      65                 :            :   [IDX_debug_str_offsets] = ".debug_str_offsets",
      66                 :            :   [IDX_debug_macinfo] = ".debug_macinfo",
      67                 :            :   [IDX_debug_macro] = ".debug_macro",
      68                 :            :   [IDX_debug_ranges] = ".debug_ranges",
      69                 :            :   [IDX_debug_rnglists] = ".debug_rnglists",
      70                 :            :   [IDX_gnu_debugaltlink] = ".gnu_debugaltlink"
      71                 :            : };
      72                 :            : #define ndwarf_scnnames (sizeof (dwarf_scnnames) / sizeof (dwarf_scnnames[0]))
      73                 :            : 
      74                 :            : /* Map from section index to string section index.
      75                 :            :    Non-string sections should have STR_SCN_IDX_last.  */
      76                 :            : static const enum string_section_index scn_to_string_section_idx[IDX_last] =
      77                 :            : {
      78                 :            :   [IDX_debug_info] = STR_SCN_IDX_last,
      79                 :            :   [IDX_debug_types] = STR_SCN_IDX_last,
      80                 :            :   [IDX_debug_abbrev] = STR_SCN_IDX_last,
      81                 :            :   [IDX_debug_addr] = STR_SCN_IDX_last,
      82                 :            :   [IDX_debug_aranges] = STR_SCN_IDX_last,
      83                 :            :   [IDX_debug_line] = STR_SCN_IDX_last,
      84                 :            :   [IDX_debug_line_str] = STR_SCN_IDX_debug_line_str,
      85                 :            :   [IDX_debug_frame] = STR_SCN_IDX_last,
      86                 :            :   [IDX_debug_loc] = STR_SCN_IDX_last,
      87                 :            :   [IDX_debug_loclists] = STR_SCN_IDX_last,
      88                 :            :   [IDX_debug_pubnames] = STR_SCN_IDX_last,
      89                 :            :   [IDX_debug_str] = STR_SCN_IDX_debug_str,
      90                 :            :   [IDX_debug_str_offsets] = STR_SCN_IDX_last,
      91                 :            :   [IDX_debug_macinfo] = STR_SCN_IDX_last,
      92                 :            :   [IDX_debug_macro] = STR_SCN_IDX_last,
      93                 :            :   [IDX_debug_ranges] = STR_SCN_IDX_last,
      94                 :            :   [IDX_debug_rnglists] = STR_SCN_IDX_last,
      95                 :            :   [IDX_gnu_debugaltlink] = STR_SCN_IDX_last
      96                 :            : };
      97                 :            : 
      98                 :            : static enum dwarf_type
      99                 :     351360 : scn_dwarf_type (Dwarf *result, size_t shstrndx, Elf_Scn *scn)
     100                 :            : {
     101                 :     351360 :   GElf_Shdr shdr_mem;
     102                 :     351360 :   GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
     103         [ -  + ]:     351360 :   if (shdr == NULL)
     104                 :            :     return TYPE_UNKNOWN;
     105                 :            : 
     106                 :     702720 :   const char *scnname = elf_strptr (result->elf, shstrndx,
     107                 :     351360 :                                     shdr->sh_name);
     108         [ +  + ]:     351360 :   if (scnname != NULL)
     109                 :            :     {
     110         [ +  + ]:     351278 :       if (startswith (scnname, ".gnu.debuglto_.debug"))
     111                 :            :         return TYPE_GNU_LTO;
     112   [ +  +  +  + ]:     351268 :       else if (startswith (scnname, ".debug_") || startswith (scnname, ".zdebug_"))
     113                 :            :         {
     114                 :      12252 :           size_t len = strlen (scnname);
     115         [ +  + ]:      12252 :           if (strcmp (scnname + len - 4, ".dwo") == 0)
     116                 :            :             return TYPE_DWO;
     117                 :            :           else
     118                 :      11416 :             return TYPE_PLAIN;
     119                 :            :         }
     120                 :            :     }
     121                 :            :   return TYPE_UNKNOWN;
     122                 :            : }
     123                 :            : static Dwarf *
     124                 :     595908 : check_section (Dwarf *result, size_t shstrndx, Elf_Scn *scn, bool inscngrp)
     125                 :            : {
     126                 :     595908 :   GElf_Shdr shdr_mem;
     127                 :     595908 :   GElf_Shdr *shdr;
     128                 :            : 
     129                 :            :   /* Get the section header data.  */
     130                 :     595908 :   shdr = gelf_getshdr (scn, &shdr_mem);
     131         [ -  + ]:     595908 :   if (shdr == NULL)
     132                 :            :     /* We may read /proc/PID/mem with only program headers mapped and section
     133                 :            :        headers out of the mapped pages.  */
     134                 :          0 :     goto err;
     135                 :            : 
     136                 :            :   /* Ignore any SHT_NOBITS sections.  Debugging sections should not
     137                 :            :      have been stripped, but in case of a corrupt file we won't try
     138                 :            :      to look at the missing data.  */
     139         [ +  + ]:     595908 :   if (unlikely (shdr->sh_type == SHT_NOBITS))
     140                 :            :     return result;
     141                 :            : 
     142                 :            :   /* Make sure the section is part of a section group only iff we
     143                 :            :      really need it.  If we are looking for the global (= non-section
     144                 :            :      group debug info) we have to ignore all the info in section
     145                 :            :      groups.  If we are looking into a section group we cannot look at
     146                 :            :      a section which isn't part of the section group.  */
     147   [ +  -  +  + ]:     563982 :   if (! inscngrp && (shdr->sh_flags & SHF_GROUP) != 0)
     148                 :            :     /* Ignore the section.  */
     149                 :            :     return result;
     150                 :            : 
     151                 :            : 
     152                 :            :   /* We recognize the DWARF section by their names.  This is not very
     153                 :            :      safe and stable but the best we can do.  */
     154                 :    1127960 :   const char *scnname = elf_strptr (result->elf, shstrndx,
     155                 :     563980 :                                     shdr->sh_name);
     156         [ +  + ]:     563980 :   if (scnname == NULL)
     157                 :            :     {
     158                 :            :       /* The section name must be valid.  Otherwise is the ELF file
     159                 :            :          invalid.  */
     160                 :          2 :     err:
     161                 :          2 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     162                 :          2 :       __libdw_seterrno (DWARF_E_INVALID_ELF);
     163                 :          2 :       free (result);
     164                 :          2 :       return NULL;
     165                 :            :     }
     166                 :            : 
     167                 :            :   /* Recognize the various sections.  Most names start with .debug_.
     168                 :            :      They might be compressed (and start with .z).  Or end with .dwo
     169                 :            :      for split dwarf sections.  Or start with .gnu.debuglto_ for
     170                 :            :      LTO debug sections.  We should only use one consistent set at
     171                 :            :      a time.  We prefer PLAIN over DWO over LTO.  */
     172                 :            :   size_t cnt;
     173                 :    9674654 :   bool gnu_compressed = false;
     174         [ +  + ]:    9674654 :   for (cnt = 0; cnt < ndwarf_scnnames; ++cnt)
     175                 :            :     {
     176                 :    9200586 :       size_t dbglen = strlen (dwarf_scnnames[cnt]);
     177                 :    9200586 :       size_t scnlen = strlen (scnname);
     178         [ +  + ]:    9200586 :       if (strncmp (scnname, dwarf_scnnames[cnt], dbglen) == 0
     179         [ +  + ]:     110574 :           && (dbglen == scnlen
     180         [ +  + ]:      21664 :               || (scnlen == dbglen + 4
     181         [ +  + ]:      11174 :                   && strstr (scnname, ".dwo") == scnname + dbglen)))
     182                 :            :         {
     183         [ +  + ]:      89746 :           if (dbglen == scnlen)
     184                 :            :             {
     185         [ -  + ]:      88910 :               if (result->type == TYPE_PLAIN)
     186                 :            :                 break;
     187                 :            :             }
     188         [ -  + ]:        836 :           else if (result->type == TYPE_DWO)
     189                 :            :             break;
     190                 :            :         }
     191   [ +  +  +  + ]:    9110840 :       else if (scnname[0] == '.' && scnname[1] == 'z'
     192         [ +  + ]:       1188 :                && (strncmp (&scnname[2], &dwarf_scnnames[cnt][1],
     193                 :            :                             dbglen - 1) == 0
     194         [ -  + ]:        164 :                    && (scnlen == dbglen + 1
     195         [ #  # ]:          0 :                        || (scnlen == dbglen + 5
     196                 :          0 :                            && strstr (scnname,
     197         [ #  # ]:          0 :                                       ".dwo") == scnname + dbglen + 1))))
     198                 :            :         {
     199         [ +  - ]:        164 :           if (scnlen == dbglen + 1)
     200                 :            :             {
     201         [ -  + ]:        164 :               if (result->type == TYPE_PLAIN)
     202                 :            :                 {
     203                 :            :                   gnu_compressed = true;
     204                 :            :                   break;
     205                 :            :                 }
     206                 :            :             }
     207         [ #  # ]:          0 :           else if (result->type <= TYPE_DWO)
     208                 :            :             {
     209                 :            :               gnu_compressed = true;
     210                 :            :               break;
     211                 :            :             }
     212                 :            :         }
     213         [ +  + ]:    9110676 :       else if (scnlen > 14 /* .gnu.debuglto_ prefix. */
     214         [ +  + ]:     757826 :                && startswith (scnname, ".gnu.debuglto_")
     215         [ +  + ]:        180 :                && strcmp (&scnname[14], dwarf_scnnames[cnt]) == 0)
     216                 :            :         {
     217         [ +  - ]:         10 :           if (result->type == TYPE_GNU_LTO)
     218                 :            :             break;
     219                 :            :         }
     220                 :            :     }
     221                 :            : 
     222         [ +  + ]:     563978 :   if (cnt >= ndwarf_scnnames)
     223                 :            :     /* Not a debug section; ignore it. */
     224                 :            :     return result;
     225                 :            : 
     226         [ -  + ]:      89910 :   if (unlikely (result->sectiondata[cnt] != NULL))
     227                 :            :     /* A section appears twice.  That's bad.  We ignore the section.  */
     228                 :            :     return result;
     229                 :            : 
     230                 :            :   /* We cannot know whether or not a GNU compressed section has already
     231                 :            :      been uncompressed or not, so ignore any errors.  */
     232         [ +  + ]:      89910 :   if (gnu_compressed)
     233                 :        164 :     elf_compress_gnu (scn, 0, 0);
     234                 :            : 
     235         [ +  + ]:      89910 :   if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
     236                 :            :     {
     237         [ -  + ]:        678 :       if (elf_compress (scn, 0, 0) < 0)
     238                 :            :         {
     239                 :            :           /* It would be nice if we could fail with a specific error.
     240                 :            :              But we don't know if this was an essential section or not.
     241                 :            :              So just continue for now. See also valid_p().  */
     242                 :            :           return result;
     243                 :            :         }
     244                 :            :     }
     245                 :            : 
     246                 :            :   /* Get the section data.  Should be raw bytes, no conversion needed.  */
     247                 :      89910 :   Elf_Data *data = elf_rawdata (scn, NULL);
     248         [ -  + ]:      89910 :   if (data == NULL)
     249                 :          0 :     goto err;
     250                 :            : 
     251   [ +  +  -  + ]:      89910 :   if (data->d_buf == NULL || data->d_size == 0)
     252                 :            :     /* No data actually available, ignore it. */
     253                 :            :     return result;
     254                 :            : 
     255                 :            :   /* We can now read the section data into results. */
     256                 :      89898 :   result->sectiondata[cnt] = data;
     257                 :            : 
     258                 :            :   /* If the section contains string data, we want to know a size of a prefix
     259                 :            :      where any string will be null-terminated. */
     260                 :      89898 :   enum string_section_index string_section_idx = scn_to_string_section_idx[cnt];
     261         [ +  + ]:      89898 :   if (string_section_idx < STR_SCN_IDX_last)
     262                 :            :     {
     263                 :            :       size_t size = data->d_size;
     264                 :            :       /* Reduce the size by the number of non-zero bytes at the end of the
     265                 :            :          section.  */
     266   [ +  -  -  + ]:      21788 :       while (size > 0 && *((const char *) data->d_buf + size - 1) != '\0')
     267                 :            :         --size;
     268                 :      21788 :       result->string_section_size[string_section_idx] = size;
     269                 :            :     }
     270                 :            : 
     271                 :            :   return result;
     272                 :            : }
     273                 :            : 
     274                 :            : 
     275                 :            : /* Helper function to set debugdir field.  We want to cache the dir
     276                 :            :    where we found this Dwarf ELF file to locate alt and dwo files.  */
     277                 :            : char *
     278                 :      12942 : __libdw_debugdir (int fd)
     279                 :            : {
     280                 :            :   /* strlen ("/proc/self/fd/") = 14 + strlen (<MAXINT>) = 10 + 1 = 25.  */
     281                 :      12942 :   char devfdpath[25];
     282         [ +  - ]:      12942 :   sprintf (devfdpath, "/proc/self/fd/%u", fd);
     283         [ +  - ]:      12942 :   char *fdpath = realpath (devfdpath, NULL);
     284                 :      12942 :   char *fddir;
     285   [ +  +  +  - ]:      12942 :   if (fdpath != NULL && fdpath[0] == '/'
     286         [ +  - ]:      12082 :       && (fddir = strrchr (fdpath, '/')) != NULL)
     287                 :            :     {
     288                 :      12082 :       *++fddir = '\0';
     289                 :      12082 :       return fdpath;
     290                 :            :     }
     291                 :            :   return NULL;
     292                 :            : }
     293                 :            : 
     294                 :            : 
     295                 :            : /* Check whether all the necessary DWARF information is available.  */
     296                 :            : static Dwarf *
     297                 :      11846 : valid_p (Dwarf *result)
     298                 :            : {
     299                 :            :   /* We looked at all the sections.  Now determine whether all the
     300                 :            :      sections with debugging information we need are there.
     301                 :            : 
     302                 :            :      Require at least one section that can be read "standalone".  */
     303         [ +  + ]:      11846 :   if (likely (result != NULL)
     304   [ +  +  +  +  :      11844 :       && unlikely (result->sectiondata[IDX_debug_info] == NULL
                   +  + ]
     305                 :            :                    && result->sectiondata[IDX_debug_line] == NULL
     306                 :            :                    && result->sectiondata[IDX_debug_frame] == NULL))
     307                 :            :     {
     308                 :        288 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     309                 :        288 :       __libdw_seterrno (DWARF_E_NO_DWARF);
     310                 :        288 :       free (result);
     311                 :        288 :       result = NULL;
     312                 :            :     }
     313                 :            : 
     314                 :            :   /* We are setting up some "fake" CUs, which need an address size.
     315                 :            :      Check the ELF class to come up with something reasonable.  */
     316                 :      23390 :   int elf_addr_size = 8;
     317         [ +  + ]:      11834 :   if (result != NULL)
     318                 :            :     {
     319                 :      11556 :       GElf_Ehdr ehdr;
     320         [ -  + ]:      11556 :       if (gelf_getehdr (result->elf, &ehdr) == NULL)
     321                 :            :         {
     322                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     323                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_ELF);
     324                 :          0 :           free (result);
     325                 :          0 :           result = NULL;
     326                 :            :         }
     327         [ +  + ]:      11556 :       else if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
     328                 :        236 :         elf_addr_size = 4;
     329                 :            :     }
     330                 :            : 
     331                 :            :   /* For dwarf_location_attr () we need a "fake" CU to indicate
     332                 :            :      where the "fake" attribute data comes from.  This is a block
     333                 :            :      inside the .debug_loc or .debug_loclists section.  */
     334         [ +  + ]:      11556 :   if (result != NULL && result->sectiondata[IDX_debug_loc] != NULL)
     335                 :            :     {
     336                 :        296 :       result->fake_loc_cu = malloc (sizeof (Dwarf_CU));
     337         [ -  + ]:        296 :       if (unlikely (result->fake_loc_cu == NULL))
     338                 :            :         {
     339                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     340                 :          0 :           __libdw_seterrno (DWARF_E_NOMEM);
     341                 :          0 :           free (result);
     342                 :          0 :           result = NULL;
     343                 :            :         }
     344                 :            :       else
     345                 :            :         {
     346                 :        296 :           result->fake_loc_cu->sec_idx = IDX_debug_loc;
     347                 :        296 :           result->fake_loc_cu->dbg = result;
     348                 :        296 :           result->fake_loc_cu->startp
     349                 :        296 :             = result->sectiondata[IDX_debug_loc]->d_buf;
     350                 :        296 :           result->fake_loc_cu->endp
     351                 :        296 :             = (result->sectiondata[IDX_debug_loc]->d_buf
     352                 :        296 :                + result->sectiondata[IDX_debug_loc]->d_size);
     353                 :        296 :           result->fake_loc_cu->locs = NULL;
     354                 :        296 :           result->fake_loc_cu->address_size = elf_addr_size;
     355                 :        296 :           result->fake_loc_cu->offset_size = 4;
     356                 :        296 :           result->fake_loc_cu->version = 4;
     357                 :        296 :           result->fake_loc_cu->split = NULL;
     358                 :            :         }
     359                 :            :     }
     360                 :            : 
     361         [ +  + ]:      11556 :   if (result != NULL && result->sectiondata[IDX_debug_loclists] != NULL)
     362                 :            :     {
     363                 :      10346 :       result->fake_loclists_cu = malloc (sizeof (Dwarf_CU));
     364         [ -  + ]:      10346 :       if (unlikely (result->fake_loclists_cu == NULL))
     365                 :            :         {
     366                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     367                 :          0 :           __libdw_seterrno (DWARF_E_NOMEM);
     368                 :          0 :           free (result->fake_loc_cu);
     369                 :          0 :           free (result);
     370                 :          0 :           result = NULL;
     371                 :            :         }
     372                 :            :       else
     373                 :            :         {
     374                 :      10346 :           result->fake_loclists_cu->sec_idx = IDX_debug_loclists;
     375                 :      10346 :           result->fake_loclists_cu->dbg = result;
     376                 :      10346 :           result->fake_loclists_cu->startp
     377                 :      10346 :             = result->sectiondata[IDX_debug_loclists]->d_buf;
     378                 :      10346 :           result->fake_loclists_cu->endp
     379                 :      10346 :             = (result->sectiondata[IDX_debug_loclists]->d_buf
     380                 :      10346 :                + result->sectiondata[IDX_debug_loclists]->d_size);
     381                 :      10346 :           result->fake_loclists_cu->locs = NULL;
     382                 :      10346 :           result->fake_loclists_cu->address_size = elf_addr_size;
     383                 :      10346 :           result->fake_loclists_cu->offset_size = 4;
     384                 :      10346 :           result->fake_loclists_cu->version = 5;
     385                 :      10346 :           result->fake_loclists_cu->split = NULL;
     386                 :            :         }
     387                 :            :     }
     388                 :            : 
     389                 :            :   /* For DW_OP_constx/GNU_const_index and DW_OP_addrx/GNU_addr_index
     390                 :            :      the dwarf_location_attr () will need a "fake" address CU to
     391                 :            :      indicate where the attribute data comes from.  This is a just
     392                 :            :      inside the .debug_addr section, if it exists.  */
     393         [ +  + ]:      11556 :   if (result != NULL && result->sectiondata[IDX_debug_addr] != NULL)
     394                 :            :     {
     395                 :         82 :       result->fake_addr_cu = malloc (sizeof (Dwarf_CU));
     396         [ -  + ]:         82 :       if (unlikely (result->fake_addr_cu == NULL))
     397                 :            :         {
     398                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     399                 :          0 :           __libdw_seterrno (DWARF_E_NOMEM);
     400                 :          0 :           free (result->fake_loc_cu);
     401                 :          0 :           free (result->fake_loclists_cu);
     402                 :          0 :           free (result);
     403                 :          0 :           result = NULL;
     404                 :            :         }
     405                 :            :       else
     406                 :            :         {
     407                 :         82 :           result->fake_addr_cu->sec_idx = IDX_debug_addr;
     408                 :         82 :           result->fake_addr_cu->dbg = result;
     409                 :         82 :           result->fake_addr_cu->startp
     410                 :         82 :             = result->sectiondata[IDX_debug_addr]->d_buf;
     411                 :         82 :           result->fake_addr_cu->endp
     412                 :         82 :             = (result->sectiondata[IDX_debug_addr]->d_buf
     413                 :         82 :                + result->sectiondata[IDX_debug_addr]->d_size);
     414                 :         82 :           result->fake_addr_cu->locs = NULL;
     415                 :         82 :           result->fake_addr_cu->address_size = elf_addr_size;
     416                 :         82 :           result->fake_addr_cu->offset_size = 4;
     417                 :         82 :           result->fake_addr_cu->version = 5;
     418                 :         82 :           result->fake_addr_cu->split = NULL;
     419                 :            :         }
     420                 :            :     }
     421                 :            : 
     422                 :         82 :   if (result != NULL)
     423                 :      11556 :     result->debugdir = __libdw_debugdir (result->elf->fildes);
     424                 :            : 
     425                 :      11846 :   return result;
     426                 :            : }
     427                 :            : 
     428                 :            : 
     429                 :            : static Dwarf *
     430                 :      11846 : global_read (Dwarf *result, Elf *elf, size_t shstrndx)
     431                 :            : {
     432                 :      11846 :   Elf_Scn *scn = NULL;
     433                 :            : 
     434                 :            :   /* First check the type (PLAIN, DWO, LTO) we are looking for.  We
     435                 :            :      prefer PLAIN if available over DWO, over LTO.  */
     436   [ +  +  +  + ]:     363206 :   while ((scn = elf_nextscn (elf, scn)) != NULL && result->type != TYPE_PLAIN)
     437                 :            :     {
     438                 :     351360 :       enum dwarf_type type = scn_dwarf_type (result, shstrndx, scn);
     439         [ +  + ]:     351360 :       if (type > result->type)
     440                 :      11558 :         result->type = type;
     441                 :            :     }
     442                 :            : 
     443                 :            :   scn = NULL;
     444   [ +  +  +  + ]:     607754 :   while (result != NULL && (scn = elf_nextscn (elf, scn)) != NULL)
     445                 :     595908 :     result = check_section (result, shstrndx, scn, false);
     446                 :            : 
     447                 :      11846 :   return valid_p (result);
     448                 :            : }
     449                 :            : 
     450                 :            : 
     451                 :            : static Dwarf *
     452                 :          0 : scngrp_read (Dwarf *result, Elf *elf, size_t shstrndx, Elf_Scn *scngrp)
     453                 :            : {
     454                 :          0 :   GElf_Shdr shdr_mem;
     455                 :          0 :   GElf_Shdr *shdr = gelf_getshdr (scngrp, &shdr_mem);
     456         [ #  # ]:          0 :   if (shdr == NULL)
     457                 :            :     {
     458                 :          0 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     459                 :          0 :       __libdw_seterrno (DWARF_E_INVALID_ELF);
     460                 :          0 :       free (result);
     461                 :          0 :       return NULL;
     462                 :            :     }
     463                 :            : 
     464         [ #  # ]:          0 :   if ((shdr->sh_flags & SHF_COMPRESSED) != 0
     465         [ #  # ]:          0 :       && elf_compress (scngrp, 0, 0) < 0)
     466                 :            :     {
     467                 :          0 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     468                 :          0 :       __libdw_seterrno (DWARF_E_COMPRESSED_ERROR);
     469                 :          0 :       free (result);
     470                 :          0 :       return NULL;
     471                 :            :     }
     472                 :            : 
     473                 :            :   /* SCNGRP is the section descriptor for a section group which might
     474                 :            :      contain debug sections.  */
     475                 :          0 :   Elf_Data *data = elf_getdata (scngrp, NULL);
     476         [ #  # ]:          0 :   if (data == NULL)
     477                 :            :     {
     478                 :            :       /* We cannot read the section content.  Fail!  */
     479                 :          0 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     480                 :          0 :       free (result);
     481                 :          0 :       return NULL;
     482                 :            :     }
     483                 :            : 
     484                 :            :   /* The content of the section is a number of 32-bit words which
     485                 :            :      represent section indices.  The first word is a flag word.  */
     486                 :          0 :   Elf32_Word *scnidx = (Elf32_Word *) data->d_buf;
     487                 :          0 :   size_t cnt;
     488                 :            : 
     489                 :            :   /* First check the type (PLAIN, DWO, LTO) we are looking for.  We
     490                 :            :      prefer PLAIN if available over DWO, over LTO.  */
     491         [ #  # ]:          0 :   for (cnt = 1; cnt * sizeof (Elf32_Word) <= data->d_size; ++cnt)
     492                 :            :     {
     493                 :          0 :       Elf_Scn *scn = elf_getscn (elf, scnidx[cnt]);
     494         [ #  # ]:          0 :       if (scn == NULL)
     495                 :            :         {
     496                 :            :           /* A section group refers to a non-existing section.  Should
     497                 :            :              never happen.  */
     498                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     499                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_ELF);
     500                 :          0 :           free (result);
     501                 :          0 :           return NULL;
     502                 :            :         }
     503                 :            : 
     504                 :          0 :       enum dwarf_type type = scn_dwarf_type (result, shstrndx, scn);
     505         [ #  # ]:          0 :       if (type > result->type)
     506                 :          0 :         result->type = type;
     507                 :            :     }
     508                 :            : 
     509   [ #  #  #  # ]:          0 :   for (cnt = 1; cnt * sizeof (Elf32_Word) <= data->d_size && result != NULL; ++cnt)
     510                 :            :     {
     511                 :          0 :       Elf_Scn *scn = elf_getscn (elf, scnidx[cnt]);
     512         [ #  # ]:          0 :       assert (scn != NULL); // checked above
     513                 :          0 :       result = check_section (result, shstrndx, scn, true);
     514         [ #  # ]:          0 :       if (result == NULL)
     515                 :            :         break;
     516                 :            :     }
     517                 :            : 
     518                 :          0 :   return valid_p (result);
     519                 :            : }
     520                 :            : 
     521                 :            : 
     522                 :            : Dwarf *
     523                 :      11846 : dwarf_begin_elf (Elf *elf, Dwarf_Cmd cmd, Elf_Scn *scngrp)
     524                 :            : {
     525                 :      11846 :   GElf_Ehdr *ehdr;
     526                 :      11846 :   GElf_Ehdr ehdr_mem;
     527                 :            : 
     528                 :            :   /* Get the ELF header of the file.  We need various pieces of
     529                 :            :      information from it.  */
     530                 :      11846 :   ehdr = gelf_getehdr (elf, &ehdr_mem);
     531         [ -  + ]:      11846 :   if (ehdr == NULL)
     532                 :            :     {
     533         [ #  # ]:          0 :       if (elf_kind (elf) != ELF_K_ELF)
     534                 :          0 :         __libdw_seterrno (DWARF_E_NOELF);
     535                 :            :       else
     536                 :          0 :         __libdw_seterrno (DWARF_E_GETEHDR_ERROR);
     537                 :            : 
     538                 :          0 :       return NULL;
     539                 :            :     }
     540                 :            : 
     541                 :            : 
     542                 :            :   /* Default memory allocation size.  */
     543                 :      11846 :   size_t mem_default_size = sysconf (_SC_PAGESIZE) - 4 * sizeof (void *);
     544         [ -  + ]:      11846 :   assert (sizeof (struct Dwarf) < mem_default_size);
     545                 :            : 
     546                 :            :   /* Allocate the data structure.  */
     547                 :      11846 :   Dwarf *result = calloc (1, sizeof (Dwarf));
     548         [ +  - ]:      11846 :   if (unlikely (result == NULL)
     549         [ -  + ]:      11846 :       || unlikely (Dwarf_Sig8_Hash_init (&result->sig8_hash, 11) < 0))
     550                 :            :     {
     551                 :          0 :       free (result);
     552                 :          0 :       __libdw_seterrno (DWARF_E_NOMEM);
     553                 :          0 :       return NULL;
     554                 :            :     }
     555                 :            : 
     556                 :            :   /* Fill in some values.  */
     557         [ +  + ]:      11846 :   if ((BYTE_ORDER == LITTLE_ENDIAN && ehdr->e_ident[EI_DATA] == ELFDATA2MSB)
     558                 :            :       || (BYTE_ORDER == BIG_ENDIAN && ehdr->e_ident[EI_DATA] == ELFDATA2LSB))
     559                 :        132 :     result->other_byte_order = true;
     560                 :            : 
     561                 :      11846 :   result->elf = elf;
     562                 :      11846 :   result->alt_fd = -1;
     563                 :            : 
     564                 :            :   /* Initialize the memory handling.  Initial blocks are allocated on first
     565                 :            :      actual allocation.  */
     566                 :      11846 :   result->mem_default_size = mem_default_size;
     567                 :      11846 :   result->oom_handler = __libdw_oom;
     568         [ -  + ]:      11846 :   if (pthread_rwlock_init(&result->mem_rwl, NULL) != 0)
     569                 :            :     {
     570                 :          0 :       free (result);
     571                 :          0 :       __libdw_seterrno (DWARF_E_NOMEM); /* no memory.  */
     572                 :          0 :       return NULL;
     573                 :            :     }
     574                 :      11846 :   result->mem_stacks = 0;
     575                 :      11846 :   result->mem_tails = NULL;
     576                 :            : 
     577         [ +  - ]:      11846 :   if (cmd == DWARF_C_READ || cmd == DWARF_C_RDWR)
     578                 :            :     {
     579                 :            :       /* All sections are recognized by name, so pass the section header
     580                 :            :          string index along to easily get the section names.  */
     581                 :      11846 :       size_t shstrndx;
     582         [ -  + ]:      11846 :       if (elf_getshdrstrndx (elf, &shstrndx) != 0)
     583                 :            :         {
     584                 :          0 :           Dwarf_Sig8_Hash_free (&result->sig8_hash);
     585                 :          0 :           __libdw_seterrno (DWARF_E_INVALID_ELF);
     586                 :          0 :           free (result);
     587                 :          0 :           return NULL;
     588                 :            :         }
     589                 :            : 
     590                 :            :       /* If the caller provides a section group we get the DWARF
     591                 :            :          sections only from this section group.  Otherwise we search
     592                 :            :          for the first section with the required name.  Further
     593                 :            :          sections with the name are ignored.  The DWARF specification
     594                 :            :          does not really say this is allowed.  */
     595         [ +  - ]:      11846 :       if (scngrp == NULL)
     596                 :      11846 :         return global_read (result, elf, shstrndx);
     597                 :            :       else
     598                 :          0 :         return scngrp_read (result, elf, shstrndx, scngrp);
     599                 :            :     }
     600         [ #  # ]:          0 :   else if (cmd == DWARF_C_WRITE)
     601                 :            :     {
     602                 :          0 :       Dwarf_Sig8_Hash_free (&result->sig8_hash);
     603                 :          0 :       __libdw_seterrno (DWARF_E_UNIMPL);
     604                 :          0 :       free (result);
     605                 :          0 :       return NULL;
     606                 :            :     }
     607                 :            : 
     608                 :          0 :   Dwarf_Sig8_Hash_free (&result->sig8_hash);
     609                 :          0 :   __libdw_seterrno (DWARF_E_INVALID_CMD);
     610                 :          0 :   free (result);
     611                 :          0 :   return NULL;
     612                 :            : }
     613                 :            : INTDEF(dwarf_begin_elf)

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