x86: Make dl-cache.h and readelflib.c not Linux-specific

These files could be useful to any port that wants to use ld.so.cache.

Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 90 insertions, 0 deletions

diff --git a/sysdeps/x86/readelflib.c b/sysdeps/x86/readelflib.c
new file mode 100644
index 0000000000..3b8a228162
--- /dev/null
+++ b/sysdeps/x86/readelflib.c
@@ -0,0 +1,90 @@
+/* Copyright (C) 1999-2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+int process_elf32_file (const char *file_name, const char *lib,
+			int *flag, unsigned int *isa_level, char **soname,
+			void *file_contents, size_t file_length);
+int process_elf64_file (const char *file_name, const char *lib,
+			int *flag, unsigned int *isa_level, char **soname,
+			void *file_contents, size_t file_length);
+
+/* Returns 0 if everything is ok, != 0 in case of error.  */
+int
+process_elf_file (const char *file_name, const char *lib, int *flag,
+		  unsigned int *isa_level, char **soname, void *file_contents,
+		  size_t file_length)
+{
+  ElfW(Ehdr) *elf_header = (ElfW(Ehdr) *) file_contents;
+  int ret, file_flag = 0;
+
+  switch (elf_header->e_machine)
+    {
+    case EM_X86_64:
+      if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
+	/* X86-64 64bit libraries are always libc.so.6+.  */
+	file_flag = FLAG_X8664_LIB64|FLAG_ELF_LIBC6;
+      else
+	/* X32 libraries are always libc.so.6+.  */
+	file_flag = FLAG_X8664_LIBX32|FLAG_ELF_LIBC6;
+      break;
+#ifndef __x86_64__
+    case EM_IA_64:
+      if (elf_header->e_ident[EI_CLASS] == ELFCLASS64)
+	{
+	  /* IA64 64bit libraries are always libc.so.6+.  */
+	  file_flag = FLAG_IA64_LIB64|FLAG_ELF_LIBC6;
+	  break;
+	}
+      goto failed;
+#endif
+    case EM_386:
+      if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
+	break;
+      /* Fall through.  */
+    default:
+#ifndef __x86_64__
+failed:
+#endif
+      error (0, 0, _("%s is for unknown machine %d.\n"),
+	     file_name, elf_header->e_machine);
+      return 1;
+    }
+
+  if (elf_header->e_ident[EI_CLASS] == ELFCLASS32)
+    ret = process_elf32_file (file_name, lib, flag, isa_level, soname,
+			      file_contents, file_length);
+  else
+    ret = process_elf64_file (file_name, lib, flag, isa_level, soname,
+			      file_contents, file_length);
+
+  if (!ret && file_flag)
+    *flag = file_flag;
+
+  return ret;
+}
+
+#undef __ELF_NATIVE_CLASS
+#undef process_elf_file
+#define process_elf_file process_elf32_file
+#define __ELF_NATIVE_CLASS 32
+#include "elf/readelflib.c"
+
+#undef __ELF_NATIVE_CLASS
+#undef process_elf_file
+#define process_elf_file process_elf64_file
+#define __ELF_NATIVE_CLASS 64
+#include "elf/readelflib.c"