Line data    Source code

       1             : /* RISC-V specific symbolic name handling.
       2             :    This file is part of elfutils.
       3             : 
       4             :    This file is free software; you can redistribute it and/or modify
       5             :    it under the terms of either
       6             : 
       7             :      * the GNU Lesser General Public License as published by the Free
       8             :        Software Foundation; either version 3 of the License, or (at
       9             :        your option) any later version
      10             : 
      11             :    or
      12             : 
      13             :      * the GNU General Public License as published by the Free
      14             :        Software Foundation; either version 2 of the License, or (at
      15             :        your option) any later version
      16             : 
      17             :    or both in parallel, as here.
      18             : 
      19             :    elfutils is distributed in the hope that it will be useful, but
      20             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      21             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      22             :    General Public License for more details.
      23             : 
      24             :    You should have received copies of the GNU General Public License and
      25             :    the GNU Lesser General Public License along with this program.  If
      26             :    not, see <http://www.gnu.org/licenses/>.  */
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : # include <config.h>
      30             : #endif
      31             : 
      32             : #include <assert.h>
      33             : #include <elf.h>
      34             : #include <stddef.h>
      35             : #include <string.h>
      36             : 
      37             : #define BACKEND riscv_
      38             : #include "libebl_CPU.h"
      39             : 
      40             : 
      41             : /* Check for the simple reloc types.  */
      42             : Elf_Type
      43        6237 : riscv_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
      44             :                          int *addsub)
      45             : {
      46        6237 :   switch (type)
      47             :     {
      48             :     case R_RISCV_SET8:
      49             :       return ELF_T_BYTE;
      50           0 :     case R_RISCV_SET16:
      51           0 :       return ELF_T_HALF;
      52        5985 :     case R_RISCV_32:
      53             :     case R_RISCV_SET32:
      54        5985 :       return ELF_T_WORD;
      55          88 :     case R_RISCV_64:
      56          88 :       return ELF_T_XWORD;
      57          44 :     case R_RISCV_ADD16:
      58          44 :       *addsub = 1;
      59          44 :       return ELF_T_HALF;
      60          44 :     case R_RISCV_SUB16:
      61          44 :       *addsub = -1;
      62          44 :       return ELF_T_HALF;
      63           0 :     case R_RISCV_ADD32:
      64           0 :       *addsub = 1;
      65           0 :       return ELF_T_WORD;
      66           0 :     case R_RISCV_SUB32:
      67           0 :       *addsub = -1;
      68           0 :       return ELF_T_WORD;
      69          24 :     case R_RISCV_ADD64:
      70          24 :       *addsub = 1;
      71          24 :       return ELF_T_XWORD;
      72          24 :     case R_RISCV_SUB64:
      73          24 :       *addsub = -1;
      74          24 :       return ELF_T_XWORD;
      75          28 :     default:
      76          28 :       return ELF_T_NUM;
      77             :     }
      78             : }
      79             : 
      80             : /* Check whether machine flags are valid.  */
      81             : bool
      82           1 : riscv_machine_flag_check (GElf_Word flags)
      83             : {
      84           1 :   return ((flags &~ (EF_RISCV_RVC
      85           1 :                      | EF_RISCV_FLOAT_ABI)) == 0);
      86             : }
      87             : 
      88             : /* Check whether given symbol's st_value and st_size are OK despite failing
      89             :    normal checks.  */
      90             : bool
      91           1 : riscv_check_special_symbol (Elf *elf, const GElf_Sym *sym,
      92             :                             const char *name, const GElf_Shdr *destshdr)
      93             : {
      94           1 :   if (name == NULL)
      95             :     return false;
      96             : 
      97           1 :   size_t shstrndx;
      98           1 :   if (elf_getshdrstrndx (elf, &shstrndx) != 0)
      99             :     return false;
     100           1 :   const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
     101           1 :   if (sname == NULL)
     102             :     return false;
     103             : 
     104             :   /* _GLOBAL_OFFSET_TABLE_ points to the start of the .got section, but it
     105             :      is preceded by the .got.plt section in the output .got section.  */
     106           1 :   if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
     107           0 :     return (strcmp (sname, ".got") == 0
     108           0 :             && sym->st_value >= destshdr->sh_addr
     109           0 :             && sym->st_value < destshdr->sh_addr + destshdr->sh_size);
     110             : 
     111             :   /* __global_pointer$ points to the .sdata section with an offset of
     112             :      0x800.  It might however fall in the .got section, in which case we
     113             :      cannot check the offset.  The size always should be zero.  */
     114           1 :   if (strcmp (name, "__global_pointer$") == 0)
     115           0 :     return (((strcmp (sname, ".sdata") == 0
     116           0 :               && sym->st_value == destshdr->sh_addr + 0x800)
     117           0 :              || strcmp (sname, ".got") == 0)
     118           0 :             && sym->st_size == 0);
     119             : 
     120             :   return false;
     121             : }