LCOV - code coverage report
Current view: top level - backends - alpha_symbol.c (source / functions) Hit Total Coverage
Test: elfutils-0.186 Lines: 0 42 0.0 %
Date: 2021-11-11 00:14:10 Functions: 0 7 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 37 0.0 %

           Branch data     Line data    Source code
       1                 :            : /* Alpha specific symbolic name handling.
       2                 :            :    Copyright (C) 2002-2011 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       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 <elf.h>
      35                 :            : #include <stddef.h>
      36                 :            : #include <string.h>
      37                 :            : 
      38                 :            : #define BACKEND         alpha_
      39                 :            : #include "libebl_CPU.h"
      40                 :            : 
      41                 :            : 
      42                 :            : const char *
      43                 :          0 : alpha_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
      44                 :            :                         size_t len __attribute__ ((unused)))
      45                 :            : {
      46         [ #  # ]:          0 :   switch (tag)
      47                 :            :     {
      48                 :            :     case DT_ALPHA_PLTRO:
      49                 :            :       return "ALPHA_PLTRO";
      50                 :            :     default:
      51                 :          0 :       break;
      52                 :            :     }
      53                 :          0 :   return NULL;
      54                 :            : }
      55                 :            : 
      56                 :            : bool
      57                 :          0 : alpha_dynamic_tag_check (int64_t tag)
      58                 :            : {
      59                 :          0 :   return tag == DT_ALPHA_PLTRO;
      60                 :            : }
      61                 :            : 
      62                 :            : /* Check for the simple reloc types.  */
      63                 :            : Elf_Type
      64                 :          0 : alpha_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
      65                 :            :                          int *addsub __attribute__ ((unused)))
      66                 :            : {
      67      [ #  #  # ]:          0 :   switch (type)
      68                 :            :     {
      69                 :            :     case R_ALPHA_REFLONG:
      70                 :            :       return ELF_T_WORD;
      71                 :          0 :     case R_ALPHA_REFQUAD:
      72                 :          0 :       return ELF_T_XWORD;
      73                 :          0 :     default:
      74                 :          0 :       return ELF_T_NUM;
      75                 :            :     }
      76                 :            : }
      77                 :            : 
      78                 :            : 
      79                 :            : /* Check whether SHF_MASKPROC flags are valid.  */
      80                 :            : bool
      81                 :          0 : alpha_machine_section_flag_check (GElf_Xword sh_flags)
      82                 :            : {
      83                 :          0 :   return (sh_flags &~ (SHF_ALPHA_GPREL)) == 0;
      84                 :            : }
      85                 :            : 
      86                 :            : bool
      87                 :          0 : alpha_check_special_section (Ebl *ebl,
      88                 :            :                              int ndx __attribute__ ((unused)),
      89                 :            :                              const GElf_Shdr *shdr,
      90                 :            :                              const char *sname __attribute__ ((unused)))
      91                 :            : {
      92                 :          0 :   if ((shdr->sh_flags
      93         [ #  # ]:          0 :        & (SHF_WRITE | SHF_EXECINSTR)) == (SHF_WRITE | SHF_EXECINSTR)
      94         [ #  # ]:          0 :       && shdr->sh_addr != 0)
      95                 :            :     {
      96                 :            :       /* This is ordinarily flagged, but is valid for an old-style PLT.
      97                 :            : 
      98                 :            :          Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it.
      99                 :            :          Its d_ptr should match the .plt section's sh_addr.  */
     100                 :            : 
     101                 :            :       Elf_Scn *scn = NULL;
     102         [ #  # ]:          0 :       while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
     103                 :            :         {
     104                 :          0 :           GElf_Shdr scn_shdr;
     105         [ #  # ]:          0 :           if (likely (gelf_getshdr (scn, &scn_shdr) != NULL)
     106         [ #  # ]:          0 :               && scn_shdr.sh_type == SHT_DYNAMIC
     107         [ #  # ]:          0 :               && scn_shdr.sh_entsize != 0)
     108                 :            :             {
     109                 :          0 :               GElf_Addr pltgot = 0;
     110                 :          0 :               Elf_Data *data = elf_getdata (scn, NULL);
     111         [ #  # ]:          0 :               if (data != NULL)
     112         [ #  # ]:          0 :                 for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i)
     113                 :            :                   {
     114                 :          0 :                     GElf_Dyn dyn;
     115         [ #  # ]:          0 :                     if (unlikely (gelf_getdyn (data, i, &dyn) == NULL))
     116                 :            :                       break;
     117         [ #  # ]:          0 :                     if (dyn.d_tag == DT_PLTGOT)
     118                 :          0 :                       pltgot = dyn.d_un.d_ptr;
     119   [ #  #  #  # ]:          0 :                     else if (dyn.d_tag == DT_ALPHA_PLTRO && dyn.d_un.d_val != 0)
     120                 :          0 :                       return false; /* This PLT should not be writable.  */
     121                 :            :                   }
     122                 :          0 :               return pltgot == shdr->sh_addr;
     123                 :            :             }
     124                 :            :         }
     125                 :            :     }
     126                 :            : 
     127                 :            :   return false;
     128                 :            : }
     129                 :            : 
     130                 :            : /* Check whether given symbol's st_value and st_size are OK despite failing
     131                 :            :    normal checks.  */
     132                 :            : bool
     133                 :          0 : alpha_check_special_symbol (Elf *elf __attribute__ ((unused)),
     134                 :            :                             const GElf_Sym *sym __attribute__ ((unused)),
     135                 :            :                             const char *name,
     136                 :            :                             const GElf_Shdr *destshdr __attribute__ ((unused)))
     137                 :            : {
     138         [ #  # ]:          0 :   if (name == NULL)
     139                 :            :     return false;
     140                 :            : 
     141         [ #  # ]:          0 :   if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
     142                 :            :     /* On Alpha any place in the section is valid.  */
     143                 :          0 :     return true;
     144                 :            : 
     145                 :            :   return false;
     146                 :            : }
     147                 :            : 
     148                 :            : /* Check whether only valid bits are set on the st_other symbol flag.
     149                 :            :    Standard ST_VISIBILITY have already been masked off.  */
     150                 :            : bool
     151                 :          0 : alpha_check_st_other_bits (unsigned char st_other)
     152                 :            : {
     153                 :          0 :   return ((((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV)
     154                 :          0 :            || ((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD))
     155   [ #  #  #  # ]:          0 :           && (st_other &~ STO_ALPHA_STD_GPLOAD) == 0);
     156                 :            : }

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