Branch data     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 <system.h>
      34                 :            : 
      35                 :            : #include <elf.h>
      36                 :            : #include <stddef.h>
      37                 :            : #include <string.h>
      38                 :            : 
      39                 :            : #define BACKEND         aarch64_
      40                 :            : #include "libebl_CPU.h"
      41                 :            : 
      42                 :            : 
      43                 :            : /* Check for the simple reloc types.  */
      44                 :            : Elf_Type
      45                 :       4384 : aarch64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
      46                 :            :                            int *addsub __attribute__ ((unused)))
      47                 :            : {
      48         [ +  + ]:       4384 :   switch (type)
      49                 :            :     {
      50                 :            :     case R_AARCH64_ABS64:
      51                 :            :       return ELF_T_XWORD;
      52                 :            :     case R_AARCH64_ABS32:
      53                 :            :       return ELF_T_WORD;
      54                 :            :     case R_AARCH64_ABS16:
      55                 :            :       return ELF_T_HALF;
      56                 :            : 
      57                 :            :     default:
      58                 :            :       return ELF_T_NUM;
      59                 :            :     }
      60                 :            : }
      61                 :            : 
      62                 :            : /* If this is the _GLOBAL_OFFSET_TABLE_ symbol, then it should point in
      63                 :            :    the .got even if there is a .got.plt section.
      64                 :            :    https://sourceware.org/ml/libc-ports/2013-06/msg00057.html
      65                 :            :    https://bugzilla.redhat.com/show_bug.cgi?id=1201778
      66                 :            :  */
      67                 :            : bool
      68                 :          0 : aarch64_check_special_symbol (Elf *elf, const GElf_Sym *sym,
      69                 :            :                               const char *name, const GElf_Shdr *destshdr)
      70                 :            : {
      71         [ #  # ]:          0 :   if (name != NULL
      72         [ #  # ]:          0 :       && strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
      73                 :            :     {
      74                 :          0 :       size_t shstrndx;
      75         [ #  # ]:          0 :       if (elf_getshdrstrndx (elf, &shstrndx) != 0)
      76                 :          0 :         return false;
      77                 :          0 :       const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
      78         [ #  # ]:          0 :       if (sname != NULL
      79   [ #  #  #  # ]:          0 :           && (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
      80                 :            :         {
      81                 :            :           Elf_Scn *scn = NULL;
      82         [ #  # ]:          0 :           while ((scn = elf_nextscn (elf, scn)) != NULL)
      83                 :            :             {
      84                 :          0 :               GElf_Shdr shdr_mem;
      85                 :          0 :               GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
      86         [ #  # ]:          0 :               if (shdr != NULL)
      87                 :            :                 {
      88                 :          0 :                   sname = elf_strptr (elf, shstrndx, shdr->sh_name);
      89   [ #  #  #  # ]:          0 :                   if (sname != NULL && strcmp (sname, ".got") == 0)
      90                 :          0 :                     return (sym->st_value >= shdr->sh_addr
      91   [ #  #  #  # ]:          0 :                             && sym->st_value < shdr->sh_addr + shdr->sh_size);
      92                 :            :                 }
      93                 :            :             }
      94                 :            :         }
      95                 :            :     }
      96                 :            : 
      97                 :            :   return false;
      98                 :            : }
      99                 :            : 
     100                 :            : /* A data mapping symbol is a symbol with "$d" name or "$d.<any...>" name,
     101                 :            :    STT_NOTYPE, STB_LOCAL and st_size of zero. The indicate the stat of a
     102                 :            :    sequence of data items.  */
     103                 :            : bool
     104                 :          8 : aarch64_data_marker_symbol (const GElf_Sym *sym, const char *sname)
     105                 :            : {
     106                 :          8 :   return (sym != NULL && sname != NULL
     107   [ +  -  +  - ]:          8 :           && sym->st_size == 0 && GELF_ST_BIND (sym->st_info) == STB_LOCAL
     108         [ +  - ]:          8 :           && GELF_ST_TYPE (sym->st_info) == STT_NOTYPE
     109   [ +  -  -  +  :         16 :           && (strcmp (sname, "$d") == 0 || startswith (sname, "$d.")));
                   -  - ]
     110                 :            : }
     111                 :            : 
     112                 :            : const char *
     113                 :          0 : aarch64_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
     114                 :            :                           size_t len __attribute__ ((unused)))
     115                 :            : {
     116   [ #  #  #  # ]:          0 :   switch (tag)
     117                 :            :     {
     118                 :            :     case DT_AARCH64_BTI_PLT:
     119                 :            :       return "AARCH64_BTI_PLT";
     120                 :          0 :     case DT_AARCH64_PAC_PLT:
     121                 :          0 :       return "AARCH64_PAC_PLT";
     122                 :          0 :     case DT_AARCH64_VARIANT_PCS:
     123                 :          0 :       return "AARCH64_VARIANT_PCS";
     124                 :            :     default:
     125                 :          0 :       break;
     126                 :            :     }
     127                 :          0 :   return NULL;
     128                 :            : }
     129                 :            : 
     130                 :            : bool
     131                 :          0 : aarch64_dynamic_tag_check (int64_t tag)
     132                 :            : {
     133                 :          0 :   return (tag == DT_AARCH64_BTI_PLT
     134         [ #  # ]:          0 :           || tag == DT_AARCH64_PAC_PLT
     135                 :          0 :           || tag == DT_AARCH64_VARIANT_PCS);
     136                 :            : }