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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 elfutils.
      4    Written by Jakub Jelinek <jakub (at) 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 
     37 #define BACKEND		sparc_
     38 #include "libebl_CPU.h"
     39 
     40 /* Check for the simple reloc types.  */
     41 Elf_Type
     42 sparc_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
     43 {
     44   switch (type)
     45     {
     46     case R_SPARC_8:
     47       return ELF_T_BYTE;
     48     case R_SPARC_16:
     49     case R_SPARC_UA16:
     50       return ELF_T_HALF;
     51     case R_SPARC_32:
     52     case R_SPARC_UA32:
     53       return ELF_T_WORD;
     54     case R_SPARC_64:
     55     case R_SPARC_UA64:
     56       return ELF_T_XWORD;
     57     default:
     58       return ELF_T_NUM;
     59     }
     60 }
     61 
     62 /* Check whether machine flags are valid.  */
     63 bool
     64 sparc_machine_flag_check (GElf_Word flags)
     65 {
     66   return ((flags &~ (EF_SPARCV9_MM
     67 		     | EF_SPARC_LEDATA
     68 		     | EF_SPARC_32PLUS
     69 		     | EF_SPARC_SUN_US1
     70 		     | EF_SPARC_SUN_US3)) == 0);
     71 }
     72 
     73 bool
     74 sparc_check_special_section (Ebl *ebl,
     75 			     int ndx __attribute__ ((unused)),
     76 			     const GElf_Shdr *shdr,
     77 			     const char *sname __attribute__ ((unused)))
     78 {
     79   if ((shdr->sh_flags & (SHF_WRITE | SHF_EXECINSTR))
     80       == (SHF_WRITE | SHF_EXECINSTR))
     81     {
     82       /* This is ordinarily flagged, but is valid for a PLT on SPARC.
     83 
     84 	 Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it.
     85 	 Its d_ptr should match the .plt section's sh_addr.  */
     86 
     87       Elf_Scn *scn = NULL;
     88       while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
     89 	{
     90 	  GElf_Shdr scn_shdr;
     91 	  if (likely (gelf_getshdr (scn, &scn_shdr) != NULL)
     92 	      && scn_shdr.sh_type == SHT_DYNAMIC
     93 	      && scn_shdr.sh_entsize != 0)
     94 	    {
     95 	      Elf_Data *data = elf_getdata (scn, NULL);
     96 	      if (data != NULL)
     97 		for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i)
     98 		  {
     99 		    GElf_Dyn dyn;
    100 		    if (unlikely (gelf_getdyn (data, i, &dyn) == NULL))
    101 		      break;
    102 		    if (dyn.d_tag == DT_PLTGOT)
    103 		      return dyn.d_un.d_ptr == shdr->sh_addr;
    104 		  }
    105 	      break;
    106 	    }
    107 	}
    108     }
    109 
    110   return false;
    111 }
    112 
    113 const char *
    114 sparc_symbol_type_name (int type,
    115 			char *buf __attribute__ ((unused)),
    116 			size_t len __attribute__ ((unused)))
    117 {
    118   switch (type)
    119     {
    120     case STT_SPARC_REGISTER:
    121       return "SPARC_REGISTER";
    122     }
    123   return NULL;
    124 }
    125 
    126 const char *
    127 sparc_dynamic_tag_name (int64_t tag,
    128 			char *buf __attribute__ ((unused)),
    129 			size_t len __attribute__ ((unused)))
    130 {
    131   switch (tag)
    132     {
    133     case DT_SPARC_REGISTER:
    134       return "SPARC_REGISTER";
    135     }
    136   return NULL;
    137 }
    138 
    139 bool
    140 sparc_dynamic_tag_check (int64_t tag)
    141 {
    142   switch (tag)
    143     {
    144     case DT_SPARC_REGISTER:
    145       return true;
    146     }
    147   return false;
    148 }
    149