Line data    Source code

       1             : /* AArch64 specific symbolic name handling.
       2             :    Copyright (C) 2013, 2015, 2017 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             : 
       5             :    This file is free software; you can redistribute it and/or modify
       6             :    it under the terms of either
       7             : 
       8             :      * the GNU Lesser General Public License as published by the Free
       9             :        Software Foundation; either version 3 of the License, or (at
      10             :        your option) any later version
      11             : 
      12             :    or
      13             : 
      14             :      * the GNU General Public License as published by the Free
      15             :        Software Foundation; either version 2 of the License, or (at
      16             :        your option) any later version
      17             : 
      18             :    or both in parallel, as here.
      19             : 
      20             :    elfutils is distributed in the hope that it will be useful, but
      21             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23             :    General Public License for more details.
      24             : 
      25             :    You should have received copies of the GNU General Public License and
      26             :    the GNU Lesser General Public License along with this program.  If
      27             :    not, see <http://www.gnu.org/licenses/>.  */
      28             : 
      29             : #ifdef HAVE_CONFIG_H
      30             : # include <config.h>
      31             : #endif
      32             : 
      33             : #include <elf.h>
      34             : #include <stddef.h>
      35             : #include <string.h>
      36             : 
      37             : #define BACKEND         aarch64_
      38             : #include "libebl_CPU.h"
      39             : 
      40             : 
      41             : /* Check for the simple reloc types.  */
      42             : Elf_Type
      43        2180 : aarch64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
      44             :                            int *addsub __attribute__ ((unused)))
      45             : {
      46        2180 :   switch (type)
      47             :     {
      48             :     case R_AARCH64_ABS64:
      49             :       return ELF_T_XWORD;
      50             :     case R_AARCH64_ABS32:
      51             :       return ELF_T_WORD;
      52             :     case R_AARCH64_ABS16:
      53             :       return ELF_T_HALF;
      54             : 
      55             :     default:
      56             :       return ELF_T_NUM;
      57             :     }
      58             : }
      59             : 
      60             : /* If this is the _GLOBAL_OFFSET_TABLE_ symbol, then it should point in
      61             :    the .got even if there is a .got.plt section.
      62             :    https://sourceware.org/ml/libc-ports/2013-06/msg00057.html
      63             :    https://bugzilla.redhat.com/show_bug.cgi?id=1201778
      64             :  */
      65             : bool
      66           0 : aarch64_check_special_symbol (Elf *elf, const GElf_Sym *sym,
      67             :                               const char *name, const GElf_Shdr *destshdr)
      68             : {
      69           0 :   if (name != NULL
      70           0 :       && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
      71             :     {
      72           0 :       size_t shstrndx;
      73           0 :       if (elf_getshdrstrndx (elf, &shstrndx) != 0)
      74           0 :         return false;
      75           0 :       const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
      76           0 :       if (sname != NULL
      77           0 :           && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
      78             :         {
      79             :           Elf_Scn *scn = NULL;
      80           0 :           while ((scn = elf_nextscn (elf, scn)) != NULL)
      81             :             {
      82           0 :               GElf_Shdr shdr_mem;
      83           0 :               GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
      84           0 :               if (shdr != NULL)
      85             :                 {
      86           0 :                   sname = elf_strptr (elf, shstrndx, shdr->sh_name);
      87           0 :                   if (sname != NULL && strcmp (sname, ".got") == 0)
      88           0 :                     return (sym->st_value >= shdr->sh_addr
      89           0 :                             && sym->st_value < shdr->sh_addr + shdr->sh_size);
      90             :                 }
      91             :             }
      92             :         }
      93             :     }
      94             : 
      95             :   return false;
      96             : }
      97             : 
      98             : /* A data mapping symbol is a symbol with "$d" name or "$d.<any...>" name,
      99             :    STT_NOTYPE, STB_LOCAL and st_size of zero. The indicate the stat of a
     100             :    sequence of data items.  */
     101             : bool
     102           4 : aarch64_data_marker_symbol (const GElf_Sym *sym, const char *sname)
     103             : {
     104           4 :   return (sym != NULL && sname != NULL
     105           4 :           && sym->st_size == 0 && GELF_ST_BIND (sym->st_info) == STB_LOCAL
     106           4 :           && GELF_ST_TYPE (sym->st_info) == STT_NOTYPE
     107           8 :           && (strcmp (sname, "$d") == 0 || strncmp (sname, "$d.", 3) == 0));
     108             : }