Adjust for monotone.

1 files changed, 168 insertions, 0 deletions

diff --git a/libelf/elf_getshstrndx.c b/libelf/elf_getshstrndx.c
new file mode 100644
index 00000000..706092b7
--- /dev/null
+++ b/libelf/elf_getshstrndx.c
@@ -0,0 +1,168 @@
+/* Return section index of section header string table.
+   Copyright (C) 2002 Red Hat, Inc.
+   Written by Ulrich Drepper <[email protected]>, 2002.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, version 2.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <gelf.h>
+#include <stddef.h>
+#include <unistd.h>
+
+#include "libelfP.h"
+#include "common.h"
+
+
+int
+elf_getshstrndx (elf, dst)
+     Elf *elf;
+     size_t *dst;
+{
+  int result = 0;
+
+  if (elf == NULL)
+    return -1;
+
+  if (unlikely (elf->kind != ELF_K_ELF))
+    {
+      __libelf_seterrno (ELF_E_INVALID_HANDLE);
+      return -1;
+    }
+
+  rwlock_rdlock (elf->lock);
+
+  /* We rely here on the fact that the `elf' element is a common prefix
+     of `elf32' and `elf64'.  */
+  assert (offsetof (struct Elf, state.elf.ehdr)
+	  == offsetof (struct Elf, state.elf32.ehdr));
+  assert (sizeof (elf->state.elf.ehdr)
+	  == sizeof (elf->state.elf32.ehdr));
+  assert (offsetof (struct Elf, state.elf.ehdr)
+	  == offsetof (struct Elf, state.elf64.ehdr));
+  assert (sizeof (elf->state.elf.ehdr)
+	  == sizeof (elf->state.elf64.ehdr));
+
+  if (unlikely (elf->state.elf.ehdr == NULL))
+    {
+      __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
+      result = -1;
+    }
+  else
+    {
+      Elf32_Word num;
+
+      num = (elf->class == ELFCLASS32
+	     ? elf->state.elf32.ehdr->e_shstrndx
+	     : elf->state.elf64.ehdr->e_shstrndx);
+
+      /* Determine whether the index is too big to fit in the ELF
+	 header.  */
+      if (unlikely (num == SHN_XINDEX))
+	{
+	  /* Yes.  Search the zeroth section header.  */
+	  if (elf->class == ELFCLASS32)
+	    {
+	      size_t offset;
+
+	      if (elf->state.elf32.scns.data[0].shdr.e32 != NULL)
+		{
+		  num = elf->state.elf32.scns.data[0].shdr.e32->sh_link;
+		  goto success;
+		}
+
+	      offset = elf->state.elf32.ehdr->e_shoff;
+
+	      if (elf->map_address != NULL
+		  && elf->state.elf32.ehdr->e_ident[EI_DATA] == MY_ELFDATA
+		  && (ALLOW_UNALIGNED
+		      || (((size_t) ((char *) elf->map_address + offset))
+			  & (__alignof__ (Elf32_Shdr) - 1)) == 0))
+		/* We can directly access the memory.  */
+		num = ((Elf32_Shdr *) (elf->map_address + offset))->sh_link;
+	      else
+		{
+		  /* We avoid reading in all the section headers.  Just read
+		     the first one.  */
+		  Elf32_Shdr shdr_mem;
+
+		  if (pread (elf->fildes, &shdr_mem, sizeof (Elf32_Shdr),
+			     offset) != sizeof (Elf32_Shdr))
+		    {
+		      /* We must be able to read this ELF section header.  */
+		      __libelf_seterrno (ELF_E_INVALID_FILE);
+		      result = -1;
+		      goto out;
+		    }
+
+		  if (elf->state.elf32.ehdr->e_ident[EI_DATA] != MY_ELFDATA)
+		    CONVERT (shdr_mem.sh_link);
+		  num = shdr_mem.sh_link;
+		}
+	    }
+	  else
+	    {
+	      size_t offset;
+
+	      if (elf->state.elf64.scns.data[0].shdr.e64 != NULL)
+		{
+		  num = elf->state.elf64.scns.data[0].shdr.e64->sh_link;
+		  goto success;
+		}
+
+	      offset = elf->state.elf64.ehdr->e_shoff;
+
+	      if (elf->map_address != NULL
+		  && elf->state.elf64.ehdr->e_ident[EI_DATA] == MY_ELFDATA
+		  && (ALLOW_UNALIGNED
+		      || (((size_t) ((char *) elf->map_address + offset))
+			  & (__alignof__ (Elf64_Shdr) - 1)) == 0))
+		/* We can directly access the memory.  */
+		num = ((Elf64_Shdr *) (elf->map_address + offset))->sh_link;
+	      else
+		{
+		  /* We avoid reading in all the section headers.  Just read
+		     the first one.  */
+		  Elf64_Shdr shdr_mem;
+
+		  if (pread (elf->fildes, &shdr_mem, sizeof (Elf64_Shdr),
+			     offset) != sizeof (Elf64_Shdr))
+		    {
+		      /* We must be able to read this ELF section header.  */
+		      __libelf_seterrno (ELF_E_INVALID_FILE);
+		      result = -1;
+		      goto out;
+		    }
+
+		  if (elf->state.elf64.ehdr->e_ident[EI_DATA] != MY_ELFDATA)
+		    CONVERT (shdr_mem.sh_link);
+		  num = shdr_mem.sh_link;
+		}
+	    }
+	}
+
+      /* Store the result.  */
+    success:
+      *dst = num;
+    }
+
+ out:
+  rwlock_unlock (elf->lock);
+
+  return result;
+}
+INTDEF(elf_getshstrndx)