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      1 /* SPARC specific symbolic name handling.
      2    Copyright (C) 2002, 2003, 2005, 2007, 2008 Red Hat, Inc.
      3    This file is part of Red Hat elfutils.
      4    Written by Jakub Jelinek <jakub (at) redhat.com>, 2002.
      5 
      6    Red Hat elfutils is free software; you can redistribute it and/or modify
      7    it under the terms of the GNU General Public License as published by the
      8    Free Software Foundation; version 2 of the License.
      9 
     10    Red Hat elfutils is distributed in the hope that it will be useful, but
     11    WITHOUT ANY WARRANTY; without even the implied warranty of
     12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13    General Public License for more details.
     14 
     15    You should have received a copy of the GNU General Public License along
     16    with Red Hat elfutils; if not, write to the Free Software Foundation,
     17    Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
     18 
     19    Red Hat elfutils is an included package of the Open Invention Network.
     20    An included package of the Open Invention Network is a package for which
     21    Open Invention Network licensees cross-license their patents.  No patent
     22    license is granted, either expressly or impliedly, by designation as an
     23    included package.  Should you wish to participate in the Open Invention
     24    Network licensing program, please visit www.openinventionnetwork.com
     25    <http://www.openinventionnetwork.com>.  */
     26 
     27 #ifdef HAVE_CONFIG_H
     28 # include <config.h>
     29 #endif
     30 
     31 #include <elf.h>
     32 #include <stddef.h>
     33 
     34 #define BACKEND		sparc_
     35 #include "libebl_CPU.h"
     36 
     37 /* Check for the simple reloc types.  */
     38 Elf_Type
     39 sparc_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
     40 {
     41   switch (type)
     42     {
     43     case R_SPARC_8:
     44       return ELF_T_BYTE;
     45     case R_SPARC_16:
     46     case R_SPARC_UA16:
     47       return ELF_T_HALF;
     48     case R_SPARC_32:
     49     case R_SPARC_UA32:
     50       return ELF_T_WORD;
     51     case R_SPARC_64:
     52     case R_SPARC_UA64:
     53       return ELF_T_XWORD;
     54     default:
     55       return ELF_T_NUM;
     56     }
     57 }
     58 
     59 /* Check whether machine flags are valid.  */
     60 bool
     61 sparc_machine_flag_check (GElf_Word flags)
     62 {
     63   return ((flags &~ (EF_SPARCV9_MM
     64 		     | EF_SPARC_LEDATA
     65 		     | EF_SPARC_32PLUS
     66 		     | EF_SPARC_SUN_US1
     67 		     | EF_SPARC_SUN_US3)) == 0);
     68 }
     69 
     70 bool
     71 sparc_check_special_section (Ebl *ebl,
     72 			     int ndx __attribute__ ((unused)),
     73 			     const GElf_Shdr *shdr,
     74 			     const char *sname __attribute__ ((unused)))
     75 {
     76   if ((shdr->sh_flags & (SHF_WRITE | SHF_EXECINSTR))
     77       == (SHF_WRITE | SHF_EXECINSTR))
     78     {
     79       /* This is ordinarily flagged, but is valid for a PLT on SPARC.
     80 
     81 	 Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it.
     82 	 Its d_ptr should match the .plt section's sh_addr.  */
     83 
     84       Elf_Scn *scn = NULL;
     85       while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
     86 	{
     87 	  GElf_Shdr scn_shdr;
     88 	  if (likely (gelf_getshdr (scn, &scn_shdr) != NULL)
     89 	      && scn_shdr.sh_type == SHT_DYNAMIC
     90 	      && scn_shdr.sh_entsize != 0)
     91 	    {
     92 	      Elf_Data *data = elf_getdata (scn, NULL);
     93 	      if (data != NULL)
     94 		for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i)
     95 		  {
     96 		    GElf_Dyn dyn;
     97 		    if (unlikely (gelf_getdyn (data, i, &dyn) == NULL))
     98 		      break;
     99 		    if (dyn.d_tag == DT_PLTGOT)
    100 		      return dyn.d_un.d_ptr == shdr->sh_addr;
    101 		  }
    102 	      break;
    103 	    }
    104 	}
    105     }
    106 
    107   return false;
    108 }
    109 
    110 const char *
    111 sparc_symbol_type_name (int type,
    112 			char *buf __attribute__ ((unused)),
    113 			size_t len __attribute__ ((unused)))
    114 {
    115   switch (type)
    116     {
    117     case STT_SPARC_REGISTER:
    118       return "SPARC_REGISTER";
    119     }
    120   return NULL;
    121 }
    122 
    123 const char *
    124 sparc_dynamic_tag_name (int64_t tag,
    125 			char *buf __attribute__ ((unused)),
    126 			size_t len __attribute__ ((unused)))
    127 {
    128   switch (tag)
    129     {
    130     case DT_SPARC_REGISTER:
    131       return "SPARC_REGISTER";
    132     }
    133   return NULL;
    134 }
    135 
    136 bool
    137 sparc_dynamic_tag_check (int64_t tag)
    138 {
    139   switch (tag)
    140     {
    141     case DT_SPARC_REGISTER:
    142       return true;
    143     }
    144   return false;
    145 }
    146