sysdeps/unix/sysv/linux/loongarch/readelflib.c

   1 /* Support for reading ELF files.
   2    Copyright (C) 2022-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19
  20 int process_elf64_file (const char *file_name, const char *lib,
  21                         int *flag, unsigned int *isa_level, char **soname,
  22                         void *file_contents, size_t file_length);
  23
  24 #define SUPPORTED_ELF_FLAGS \
  25   (EF_LARCH_ABI_DOUBLE_FLOAT | EF_LARCH_ABI_SOFT_FLOAT)
  26
  27 /* Returns 0 if everything is ok, != 0 in case of error.  */
  28 int
  29 process_elf_file (const char *file_name, const char *lib, int *flag,
  30                   unsigned int *isa_level, char **soname, void *file_contents,
  31                   size_t file_length)
  32 {
  33   ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
  34   Elf64_Ehdr *elf64_header = (Elf64_Ehdr *) elf_header;
  35   int ret;
  36   long flags;
  37
  38   /* LoongArch libraries are always libc.so.6+.  */
  39   *flag = FLAG_ELF_LIBC6;
  40
  41   ret = process_elf64_file (file_name, lib, flag, isa_level, soname,
  42                                 file_contents, file_length);
  43   flags = elf64_header->e_flags;
  44
  45   /* LoongArch linkers encode the floating point ABI as part of the ELF headers.  */
  46   switch (flags & SUPPORTED_ELF_FLAGS)
  47     {
  48       case EF_LARCH_ABI_SOFT_FLOAT:
  49         *flag |= FLAG_LARCH_FLOAT_ABI_SOFT;
  50         break;
  51       case EF_LARCH_ABI_DOUBLE_FLOAT:
  52         *flag |= FLAG_LARCH_FLOAT_ABI_DOUBLE;
  53         break;
  54       default:
  55         return 1;
  56     }
  57
  58   /* If there are any other ELF flags set then glibc doesn't support this
  59      library.  */
  60   if (flags & ~SUPPORTED_ELF_FLAGS)
  61     return 1;
  62
  63   return ret;
  64 }
  65
  66 #undef __ELF_NATIVE_CLASS
  67 #undef process_elf_file
  68 #define process_elf_file process_elf64_file
  69 #define __ELF_NATIVE_CLASS 64
  70 #include "elf/readelflib.c"