Line data    Source code

       1             : /* PPC64 specific symbolic name handling.
       2             :    Copyright (C) 2004, 2005, 2014 Red Hat, Inc.
       3             :    This file is part of elfutils.
       4             :    Written by Ulrich Drepper <drepper@redhat.com>, 2004.
       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 <assert.h>
      35             : #include <elf.h>
      36             : #include <stddef.h>
      37             : #include <string.h>
      38             : 
      39             : #define BACKEND         ppc64_
      40             : #include "libebl_CPU.h"
      41             : 
      42             : 
      43             : /* Check for the simple reloc types.  */
      44             : Elf_Type
      45       17902 : ppc64_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
      46             :                          int *addsub __attribute__ ((unused)))
      47             : {
      48       17902 :   switch (type)
      49             :     {
      50             :     case R_PPC64_ADDR64:
      51             :     case R_PPC64_UADDR64:
      52             :       return ELF_T_XWORD;
      53       17570 :     case R_PPC64_ADDR32:
      54             :     case R_PPC64_UADDR32:
      55       17570 :       return ELF_T_WORD;
      56           0 :     case R_PPC64_UADDR16:
      57           0 :       return ELF_T_HALF;
      58          38 :     default:
      59          38 :       return ELF_T_NUM;
      60             :     }
      61             : }
      62             : 
      63             : 
      64             : const char *
      65           0 : ppc64_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
      66             :                         size_t len __attribute__ ((unused)))
      67             : {
      68           0 :   switch (tag)
      69             :     {
      70             :     case DT_PPC64_GLINK:
      71             :       return "PPC64_GLINK";
      72           0 :     case DT_PPC64_OPD:
      73           0 :       return "PPC64_OPD";
      74           0 :     case DT_PPC64_OPDSZ:
      75           0 :       return "PPC64_OPDSZ";
      76           0 :     case DT_PPC64_OPT:
      77           0 :       return "PPC64_OPT";
      78             :     default:
      79           0 :       break;
      80             :     }
      81           0 :   return NULL;
      82             : }
      83             : 
      84             : 
      85             : bool
      86         205 : ppc64_dynamic_tag_check (int64_t tag)
      87             : {
      88         205 :   return (tag == DT_PPC64_GLINK
      89             :           || tag == DT_PPC64_OPD
      90             :           || tag == DT_PPC64_OPDSZ
      91         205 :           || tag == DT_PPC64_OPT);
      92             : }
      93             : 
      94             : 
      95             : /* Check whether given symbol's st_value and st_size are OK despite failing
      96             :    normal checks.  */
      97             : bool
      98         624 : ppc64_check_special_symbol (Elf *elf,
      99             :                             const GElf_Sym *sym __attribute__ ((unused)),
     100             :                             const char *name __attribute__ ((unused)),
     101             :                             const GElf_Shdr *destshdr)
     102             : {
     103         624 :   size_t shstrndx;
     104         624 :   if (elf_getshdrstrndx (elf, &shstrndx) != 0)
     105             :     return false;
     106         624 :   const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
     107         624 :   if (sname == NULL)
     108             :     return false;
     109         624 :   return strcmp (sname, ".opd") == 0;
     110             : }
     111             : 
     112             : 
     113             : /* Check if backend uses a bss PLT in this file.  */
     114             : bool
     115           7 : ppc64_bss_plt_p (Elf *elf __attribute__ ((unused)))
     116             : {
     117           7 :   return true;
     118             : }
     119             : 
     120             : /* Check whether machine flags are valid.  PPC64 has three possible values:
     121             :    0 - for unspecified ABI, or not using any specific ABI features.
     122             :    1 - for the original ELF PPC64 ABI using function descriptors.
     123             :    2 - for the revised ELFv2 PPC64 ABI without function descriptors.  */
     124             : bool
     125          23 : ppc64_machine_flag_check (GElf_Word flags)
     126             : {
     127          23 :   return flags == 0 || flags == 1 || flags == 2;
     128             : }
     129             : 
     130             : bool
     131           0 : ppc64_check_st_other_bits (unsigned char st_other)
     132             : {
     133           0 :   return (PPC64_LOCAL_ENTRY_OFFSET (st_other) != 0);
     134             : }