LCOV - code coverage report
Current view: top level - backends - alpha_symbol.c (source / functions) Hit Total Coverage
Test: elfutils-0.178 Lines: 0 42 0.0 %
Date: 2019-11-26 23:55:16 Functions: 0 7 0.0 %
Legend: Lines: hit not hit

          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             : }

Generated by: LCOV version 1.13