import binutils 2.14 (excluding testsuites, .info files, and .po files)

1 files changed, 1189 insertions, 0 deletions

diff --git a/gnu/usr.bin/binutils/bfd/elf-eh-frame.c b/gnu/usr.bin/binutils/bfd/elf-eh-frame.c
new file mode 100644
index 00000000000..7d0b52bc40f
--- /dev/null
+++ b/gnu/usr.bin/binutils/bfd/elf-eh-frame.c
@@ -0,0 +1,1189 @@
+/* .eh_frame section optimization.
+   Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+   Written by Jakub Jelinek <jakub@redhat.com>.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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.  */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/dwarf2.h"
+
+#define EH_FRAME_HDR_SIZE 8
+
+static bfd_vma read_unsigned_leb128
+  PARAMS ((bfd *, char *, unsigned int *));
+static bfd_signed_vma read_signed_leb128
+  PARAMS ((bfd *, char *, unsigned int *));
+static int get_DW_EH_PE_width
+  PARAMS ((int, int));
+static bfd_vma read_value
+  PARAMS ((bfd *, bfd_byte *, int, int));
+static void write_value
+  PARAMS ((bfd *, bfd_byte *, bfd_vma, int));
+static int cie_compare
+  PARAMS ((struct cie *, struct cie *));
+static int vma_compare
+  PARAMS ((const PTR, const PTR));
+
+/* Helper function for reading uleb128 encoded data.  */
+
+static bfd_vma
+read_unsigned_leb128 (abfd, buf, bytes_read_ptr)
+     bfd *abfd ATTRIBUTE_UNUSED;
+     char *buf;
+     unsigned int *bytes_read_ptr;
+{
+  bfd_vma  result;
+  unsigned int  num_read;
+  int           shift;
+  unsigned char byte;
+
+  result   = 0;
+  shift    = 0;
+  num_read = 0;
+  do
+    {
+      byte = bfd_get_8 (abfd, (bfd_byte *) buf);
+      buf ++;
+      num_read ++;
+      result |= (((bfd_vma) byte & 0x7f) << shift);
+      shift += 7;
+    }
+  while (byte & 0x80);
+  * bytes_read_ptr = num_read;
+  return result;
+}
+
+/* Helper function for reading sleb128 encoded data.  */
+
+static bfd_signed_vma
+read_signed_leb128 (abfd, buf, bytes_read_ptr)
+     bfd *abfd ATTRIBUTE_UNUSED;
+     char *buf;
+     unsigned int * bytes_read_ptr;
+{
+  bfd_vma	result;
+  int           shift;
+  int           num_read;
+  unsigned char byte;
+
+  result = 0;
+  shift = 0;
+  num_read = 0;
+  do
+    {
+      byte = bfd_get_8 (abfd, (bfd_byte *) buf);
+      buf ++;
+      num_read ++;
+      result |= (((bfd_vma) byte & 0x7f) << shift);
+      shift += 7;
+    }
+  while (byte & 0x80);
+  if (byte & 0x40)
+    result |= (((bfd_vma) -1) << (shift - 7)) << 7;
+  * bytes_read_ptr = num_read;
+  return result;
+}
+
+#define read_uleb128(VAR, BUF)					\
+do								\
+  {								\
+    (VAR) = read_unsigned_leb128 (abfd, buf, &leb128_tmp);	\
+    (BUF) += leb128_tmp;					\
+  }								\
+while (0)
+
+#define read_sleb128(VAR, BUF)					\
+do								\
+  {								\
+    (VAR) = read_signed_leb128 (abfd, buf, &leb128_tmp);	\
+    (BUF) += leb128_tmp;					\
+  }								\
+while (0)
+
+/* Return 0 if either encoding is variable width, or not yet known to bfd.  */
+
+static
+int get_DW_EH_PE_width (encoding, ptr_size)
+     int encoding, ptr_size;
+{
+  /* DW_EH_PE_ values of 0x60 and 0x70 weren't defined at the time .eh_frame
+     was added to bfd.  */
+  if ((encoding & 0x60) == 0x60)
+    return 0;
+
+  switch (encoding & 7)
+    {
+    case DW_EH_PE_udata2: return 2;
+    case DW_EH_PE_udata4: return 4;
+    case DW_EH_PE_udata8: return 8;
+    case DW_EH_PE_absptr: return ptr_size;
+    default:
+      break;
+    }
+
+  return 0;
+}
+
+#define get_DW_EH_PE_signed(encoding) (((encoding) & DW_EH_PE_signed) != 0)
+
+/* Read a width sized value from memory.  */
+
+static bfd_vma
+read_value (abfd, buf, width, is_signed)
+     bfd *abfd;
+     bfd_byte *buf;
+     int width;
+     int is_signed;
+{
+  bfd_vma value;
+
+  switch (width)
+    {
+    case 2:
+      if (is_signed)
+	value = bfd_get_signed_16 (abfd, buf);
+      else
+	value = bfd_get_16 (abfd, buf);
+      break;
+    case 4:
+      if (is_signed)
+	value = bfd_get_signed_32 (abfd, buf);
+      else
+	value = bfd_get_32 (abfd, buf);
+      break;
+    case 8:
+      if (is_signed)
+	value = bfd_get_signed_64 (abfd, buf);
+      else
+	value = bfd_get_64 (abfd, buf);
+      break;
+    default:
+      BFD_FAIL ();
+      return 0;
+    }
+
+  return value;
+}
+
+/* Store a width sized value to memory.  */
+
+static void
+write_value (abfd, buf, value, width)
+     bfd *abfd;
+     bfd_byte *buf;
+     bfd_vma value;
+     int width;
+{
+  switch (width)
+    {
+    case 2: bfd_put_16 (abfd, value, buf); break;
+    case 4: bfd_put_32 (abfd, value, buf); break;
+    case 8: bfd_put_64 (abfd, value, buf); break;
+    default: BFD_FAIL ();
+    }
+}
+
+/* Return zero if C1 and C2 CIEs can be merged.  */
+
+static
+int cie_compare (c1, c2)
+     struct cie *c1, *c2;
+{
+  if (c1->hdr.length == c2->hdr.length
+      && c1->version == c2->version
+      && strcmp (c1->augmentation, c2->augmentation) == 0
+      && strcmp (c1->augmentation, "eh") != 0
+      && c1->code_align == c2->code_align
+      && c1->data_align == c2->data_align
+      && c1->ra_column == c2->ra_column
+      && c1->augmentation_size == c2->augmentation_size
+      && c1->personality == c2->personality
+      && c1->per_encoding == c2->per_encoding
+      && c1->lsda_encoding == c2->lsda_encoding
+      && c1->fde_encoding == c2->fde_encoding
+      && (c1->initial_insn_length
+	  == c2->initial_insn_length)
+      && memcmp (c1->initial_instructions,
+		 c2->initial_instructions,
+		 c1->initial_insn_length) == 0)
+    return 0;
+
+  return 1;
+}
+
+/* This function is called for each input file before the .eh_frame
+   section is relocated.  It discards duplicate CIEs and FDEs for discarded
+   functions.  The function returns TRUE iff any entries have been
+   deleted.  */
+
+bfd_boolean
+_bfd_elf_discard_section_eh_frame (abfd, info, sec,
+				   reloc_symbol_deleted_p, cookie)
+     bfd *abfd;
+     struct bfd_link_info *info;
+     asection *sec;
+     bfd_boolean (*reloc_symbol_deleted_p) PARAMS ((bfd_vma, PTR));
+     struct elf_reloc_cookie *cookie;
+{
+  bfd_byte *ehbuf = NULL, *buf;
+  bfd_byte *last_cie, *last_fde;
+  struct cie_header hdr;
+  struct cie cie;
+  struct elf_link_hash_table *htab;
+  struct eh_frame_hdr_info *hdr_info;
+  struct eh_frame_sec_info *sec_info = NULL;
+  unsigned int leb128_tmp;
+  unsigned int cie_usage_count, last_cie_ndx, i, offset;
+  unsigned int make_relative, make_lsda_relative;
+  bfd_size_type new_size;
+  unsigned int ptr_size;
+
+  if (sec->_raw_size == 0)
+    {
+      /* This file does not contain .eh_frame information.  */
+      return FALSE;
+    }
+
+  if ((sec->output_section != NULL
+       && bfd_is_abs_section (sec->output_section)))
+    {
+      /* At least one of the sections is being discarded from the
+         link, so we should just ignore them.  */
+      return FALSE;
+    }
+
+  htab = elf_hash_table (info);
+  hdr_info = &htab->eh_info;
+
+  /* Read the frame unwind information from abfd.  */
+
+  ehbuf = (bfd_byte *) bfd_malloc (sec->_raw_size);
+  if (ehbuf == NULL)
+    goto free_no_table;
+
+  if (! bfd_get_section_contents (abfd, sec, ehbuf, (bfd_vma) 0,
+				  sec->_raw_size))
+    goto free_no_table;
+
+  if (sec->_raw_size >= 4
+      && bfd_get_32 (abfd, ehbuf) == 0
+      && cookie->rel == cookie->relend)
+    {
+      /* Empty .eh_frame section.  */
+      free (ehbuf);
+      return FALSE;
+    }
+
+  /* If .eh_frame section size doesn't fit into int, we cannot handle
+     it (it would need to use 64-bit .eh_frame format anyway).  */
+  if (sec->_raw_size != (unsigned int) sec->_raw_size)
+    goto free_no_table;
+
+  ptr_size = (elf_elfheader (abfd)->e_ident[EI_CLASS]
+	      == ELFCLASS64) ? 8 : 4;
+  buf = ehbuf;
+  last_cie = NULL;
+  last_cie_ndx = 0;
+  memset (&cie, 0, sizeof (cie));
+  cie_usage_count = 0;
+  new_size = sec->_raw_size;
+  make_relative = hdr_info->last_cie.make_relative;
+  make_lsda_relative = hdr_info->last_cie.make_lsda_relative;
+  sec_info = bfd_zmalloc (sizeof (struct eh_frame_sec_info)
+			  + 99 * sizeof (struct eh_cie_fde));
+  if (sec_info == NULL)
+    goto free_no_table;
+  sec_info->alloced = 100;
+
+#define ENSURE_NO_RELOCS(buf)				\
+  if (cookie->rel < cookie->relend			\
+      && (cookie->rel->r_offset				\
+	  < (bfd_size_type) ((buf) - ehbuf))		\
+      && cookie->rel->r_info != 0)			\
+    goto free_no_table
+
+#define SKIP_RELOCS(buf)				\
+  while (cookie->rel < cookie->relend			\
+         && (cookie->rel->r_offset			\
+	     < (bfd_size_type) ((buf) - ehbuf)))	\
+    cookie->rel++
+
+#define GET_RELOC(buf)					\
+  ((cookie->rel < cookie->relend			\
+    && (cookie->rel->r_offset				\
+        == (bfd_size_type) ((buf) - ehbuf)))		\
+   ? cookie->rel : NULL)
+
+  for (;;)
+    {
+      unsigned char *aug;
+
+      if (sec_info->count == sec_info->alloced)
+	{
+	  sec_info = bfd_realloc (sec_info,
+				  sizeof (struct eh_frame_sec_info)
+				  + (sec_info->alloced + 99)
+				     * sizeof (struct eh_cie_fde));
+	  if (sec_info == NULL)
+	    goto free_no_table;
+
+	  memset (&sec_info->entry[sec_info->alloced], 0,
+		  100 * sizeof (struct eh_cie_fde));
+	  sec_info->alloced += 100;
+	}
+
+      last_fde = buf;
+      /* If we are at the end of the section, we still need to decide
+	 on whether to output or discard last encountered CIE (if any).  */
+      if ((bfd_size_type) (buf - ehbuf) == sec->_raw_size)
+	hdr.id = (unsigned int) -1;
+      else
+	{
+	  if ((bfd_size_type) (buf + 4 - ehbuf) > sec->_raw_size)
+	    /* No space for CIE/FDE header length.  */
+	    goto free_no_table;
+
+	  hdr.length = bfd_get_32 (abfd, buf);
+	  if (hdr.length == 0xffffffff)
+	    /* 64-bit .eh_frame is not supported.  */
+	    goto free_no_table;
+	  buf += 4;
+	  if ((bfd_size_type) (buf - ehbuf) + hdr.length > sec->_raw_size)
+	    /* CIE/FDE not contained fully in this .eh_frame input section.  */
+	    goto free_no_table;
+
+	  sec_info->entry[sec_info->count].offset = last_fde - ehbuf;
+	  sec_info->entry[sec_info->count].size = 4 + hdr.length;
+
+	  if (hdr.length == 0)
+	    {
+	      /* CIE with length 0 must be only the last in the section.  */
+	      if ((bfd_size_type) (buf - ehbuf) < sec->_raw_size)
+		goto free_no_table;
+	      ENSURE_NO_RELOCS (buf);
+	      sec_info->count++;
+	      /* Now just finish last encountered CIE processing and break
+		 the loop.  */
+	      hdr.id = (unsigned int) -1;
+	    }
+	  else
+	    {
+	      hdr.id = bfd_get_32 (abfd, buf);
+	      buf += 4;
+	      if (hdr.id == (unsigned int) -1)
+		goto free_no_table;
+	    }
+	}
+
+      if (hdr.id == 0 || hdr.id == (unsigned int) -1)
+	{
+	  unsigned int initial_insn_length;
+
+	  /* CIE  */
+	  if (last_cie != NULL)
+	    {
+	      /* Now check if this CIE is identical to the last CIE,
+		 in which case we can remove it provided we adjust
+		 all FDEs.  Also, it can be removed if we have removed
+		 all FDEs using it.  */
+	      if ((!info->relocateable
+		   && cie_compare (&cie, &hdr_info->last_cie) == 0)
+		  || cie_usage_count == 0)
+		{
+		  new_size -= cie.hdr.length + 4;
+		  sec_info->entry[last_cie_ndx].removed = 1;
+		  sec_info->entry[last_cie_ndx].sec = hdr_info->last_cie_sec;
+		  sec_info->entry[last_cie_ndx].new_offset
+		    = hdr_info->last_cie_offset;
+		}
+	      else
+		{
+		  hdr_info->last_cie = cie;
+		  hdr_info->last_cie_sec = sec;
+		  hdr_info->last_cie_offset = last_cie - ehbuf;
+		  sec_info->entry[last_cie_ndx].make_relative
+		    = cie.make_relative;
+		  sec_info->entry[last_cie_ndx].make_lsda_relative
+		    = cie.make_lsda_relative;
+		  sec_info->entry[last_cie_ndx].per_encoding_relative
+		    = (cie.per_encoding & 0x70) == DW_EH_PE_pcrel;
+		}
+	    }
+
+	  if (hdr.id == (unsigned int) -1)
+	    break;
+
+	  last_cie_ndx = sec_info->count;
+	  sec_info->entry[sec_info->count].cie = 1;
+
+	  cie_usage_count = 0;
+	  memset (&cie, 0, sizeof (cie));
+	  cie.hdr = hdr;
+	  cie.version = *buf++;
+
+	  /* Cannot handle unknown versions.  */
+	  if (cie.version != 1)
+	    goto free_no_table;
+	  if (strlen (buf) > sizeof (cie.augmentation) - 1)
+	    goto free_no_table;
+
+	  strcpy (cie.augmentation, buf);
+	  buf = strchr (buf, '\0') + 1;
+	  ENSURE_NO_RELOCS (buf);
+	  if (buf[0] == 'e' && buf[1] == 'h')
+	    {
+	      /* GCC < 3.0 .eh_frame CIE */
+	      /* We cannot merge "eh" CIEs because __EXCEPTION_TABLE__
+		 is private to each CIE, so we don't need it for anything.
+		 Just skip it.  */
+	      buf += ptr_size;
+	      SKIP_RELOCS (buf);
+	    }
+	  read_uleb128 (cie.code_align, buf);
+	  read_sleb128 (cie.data_align, buf);
+	  /* Note - in DWARF2 the return address column is an unsigned byte.
+	     In DWARF3 it is a ULEB128.  We are following DWARF3.  For most
+	     ports this will not matter as the value will be less than 128.
+	     For the others (eg FRV, SH, MMIX, IA64) they need a fixed GCC
+	     which conforms to the DWARF3 standard.  */
+	  read_uleb128 (cie.ra_column, buf);
+	  ENSURE_NO_RELOCS (buf);
+	  cie.lsda_encoding = DW_EH_PE_omit;
+	  cie.fde_encoding = DW_EH_PE_omit;
+	  cie.per_encoding = DW_EH_PE_omit;
+	  aug = cie.augmentation;
+	  if (aug[0] != 'e' || aug[1] != 'h')
+	    {
+	      if (*aug == 'z')
+		{
+		  aug++;
+		  read_uleb128 (cie.augmentation_size, buf);
+	  	  ENSURE_NO_RELOCS (buf);
+		}
+
+	      while (*aug != '\0')
+		switch (*aug++)
+		  {
+		  case 'L':
+		    cie.lsda_encoding = *buf++;
+		    ENSURE_NO_RELOCS (buf);
+		    if (get_DW_EH_PE_width (cie.lsda_encoding, ptr_size) == 0)
+		      goto free_no_table;
+		    break;
+		  case 'R':
+		    cie.fde_encoding = *buf++;
+		    ENSURE_NO_RELOCS (buf);
+		    if (get_DW_EH_PE_width (cie.fde_encoding, ptr_size) == 0)
+		      goto free_no_table;
+		    break;
+		  case 'P':
+		    {
+		      int per_width;
+
+		      cie.per_encoding = *buf++;
+		      per_width = get_DW_EH_PE_width (cie.per_encoding,
+						      ptr_size);
+		      if (per_width == 0)
+			goto free_no_table;
+		      if ((cie.per_encoding & 0xf0) == DW_EH_PE_aligned)
+			buf = (ehbuf
+			       + ((buf - ehbuf + per_width - 1)
+				  & ~((bfd_size_type) per_width - 1)));
+		      ENSURE_NO_RELOCS (buf);
+		      /* Ensure we have a reloc here, against
+			 a global symbol.  */
+		      if (GET_RELOC (buf) != NULL)
+			{
+			  unsigned long r_symndx;
+
+#ifdef BFD64
+			  if (ptr_size == 8)
+			    r_symndx = ELF64_R_SYM (cookie->rel->r_info);
+			  else
+#endif
+			    r_symndx = ELF32_R_SYM (cookie->rel->r_info);
+			  if (r_symndx >= cookie->locsymcount)
+			    {
+			      struct elf_link_hash_entry *h;
+
+			      r_symndx -= cookie->extsymoff;
+			      h = cookie->sym_hashes[r_symndx];
+
+			      while (h->root.type == bfd_link_hash_indirect
+				     || h->root.type == bfd_link_hash_warning)
+				h = (struct elf_link_hash_entry *)
+				    h->root.u.i.link;
+
+			      cie.personality = h;
+			    }
+			  cookie->rel++;
+			}
+		      buf += per_width;
+		    }
+		    break;
+		  default:
+		    /* Unrecognized augmentation. Better bail out.  */
+		    goto free_no_table;
+		  }
+	    }
+
+	  /* For shared libraries, try to get rid of as many RELATIVE relocs
+	     as possible.  */
+          if (info->shared
+	      && (cie.fde_encoding & 0xf0) == DW_EH_PE_absptr)
+	    cie.make_relative = 1;
+
+	  if (info->shared
+	      && (cie.lsda_encoding & 0xf0) == DW_EH_PE_absptr)
+	    cie.make_lsda_relative = 1;
+
+	  /* If FDE encoding was not specified, it defaults to
+	     DW_EH_absptr.  */
+	  if (cie.fde_encoding == DW_EH_PE_omit)
+	    cie.fde_encoding = DW_EH_PE_absptr;
+
+	  initial_insn_length = cie.hdr.length - (buf - last_fde - 4);
+	  if (initial_insn_length <= 50)
+	    {
+	      cie.initial_insn_length = initial_insn_length;
+	      memcpy (cie.initial_instructions, buf, initial_insn_length);
+	    }
+	  buf += initial_insn_length;
+	  ENSURE_NO_RELOCS (buf);
+	  last_cie = last_fde;
+	}
+      else
+	{
+	  /* Ensure this FDE uses the last CIE encountered.  */
+	  if (last_cie == NULL
+	      || hdr.id != (unsigned int) (buf - 4 - last_cie))
+	    goto free_no_table;
+
+	  ENSURE_NO_RELOCS (buf);
+	  if (GET_RELOC (buf) == NULL)
+	    /* This should not happen.  */
+	    goto free_no_table;
+	  if ((*reloc_symbol_deleted_p) (buf - ehbuf, cookie))
+	    {
+	      /* This is a FDE against a discarded section.  It should
+		 be deleted.  */
+	      new_size -= hdr.length + 4;
+	      sec_info->entry[sec_info->count].removed = 1;
+	    }
+	  else
+	    {
+	      if (info->shared
+		  && (((cie.fde_encoding & 0xf0) == DW_EH_PE_absptr
+		       && cie.make_relative == 0)
+		      || (cie.fde_encoding & 0xf0) == DW_EH_PE_aligned))
+		{
+		  /* If a shared library uses absolute pointers
+		     which we cannot turn into PC relative,
+		     don't create the binary search table,
+		     since it is affected by runtime relocations.  */
+		  hdr_info->table = FALSE;
+		}
+	      cie_usage_count++;
+	      hdr_info->fde_count++;
+	    }
+	  if (cie.lsda_encoding != DW_EH_PE_omit)
+	    {
+	      unsigned int dummy;
+
+	      aug = buf;
+	      buf += 2 * get_DW_EH_PE_width (cie.fde_encoding, ptr_size);
+	      if (cie.augmentation[0] == 'z')
+		read_uleb128 (dummy, buf);
+	      /* If some new augmentation data is added before LSDA
+		 in FDE augmentation area, this need to be adjusted.  */
+	      sec_info->entry[sec_info->count].lsda_offset = (buf - aug);
+	    }
+	  buf = last_fde + 4 + hdr.length;
+	  SKIP_RELOCS (buf);
+	}
+
+      sec_info->entry[sec_info->count].fde_encoding = cie.fde_encoding;
+      sec_info->entry[sec_info->count].lsda_encoding = cie.lsda_encoding;
+      sec_info->count++;
+    }
+
+  elf_section_data (sec)->sec_info = sec_info;
+  sec->sec_info_type = ELF_INFO_TYPE_EH_FRAME;
+
+  /* Ok, now we can assign new offsets.  */
+  offset = 0;
+  last_cie_ndx = 0;
+  for (i = 0; i < sec_info->count; i++)
+    {
+      if (! sec_info->entry[i].removed)
+	{
+	  sec_info->entry[i].new_offset = offset;
+	  offset += sec_info->entry[i].size;
+	  if (sec_info->entry[i].cie)
+	    {
+	      last_cie_ndx = i;
+	      make_relative = sec_info->entry[i].make_relative;
+	      make_lsda_relative = sec_info->entry[i].make_lsda_relative;
+	    }
+	  else
+	    {
+	      sec_info->entry[i].make_relative = make_relative;
+	      sec_info->entry[i].make_lsda_relative = make_lsda_relative;
+	      sec_info->entry[i].per_encoding_relative = 0;
+	    }
+	}
+      else if (sec_info->entry[i].cie && sec_info->entry[i].sec == sec)
+	{
+	  /* Need to adjust new_offset too.  */
+	  BFD_ASSERT (sec_info->entry[last_cie_ndx].offset
+		      == sec_info->entry[i].new_offset);
+	  sec_info->entry[i].new_offset
+	    = sec_info->entry[last_cie_ndx].new_offset;
+	}
+    }
+  if (hdr_info->last_cie_sec == sec)
+    {
+      BFD_ASSERT (sec_info->entry[last_cie_ndx].offset
+		  == hdr_info->last_cie_offset);
+      hdr_info->last_cie_offset = sec_info->entry[last_cie_ndx].new_offset;
+    }
+
+  /* FIXME: Currently it is not possible to shrink sections to zero size at
+     this point, so build a fake minimal CIE.  */
+  if (new_size == 0)
+    new_size = 16;
+
+  /* Shrink the sec as needed.  */
+  sec->_cooked_size = new_size;
+  if (sec->_cooked_size == 0)
+    sec->flags |= SEC_EXCLUDE;
+
+  free (ehbuf);
+  return new_size != sec->_raw_size;
+
+free_no_table:
+  if (ehbuf)
+    free (ehbuf);
+  if (sec_info)
+    free (sec_info);
+  hdr_info->table = FALSE;
+  hdr_info->last_cie.hdr.length = 0;
+  return FALSE;
+}
+
+/* This function is called for .eh_frame_hdr section after
+   _bfd_elf_discard_section_eh_frame has been called on all .eh_frame
+   input sections.  It finalizes the size of .eh_frame_hdr section.  */
+
+bfd_boolean
+_bfd_elf_discard_section_eh_frame_hdr (abfd, info)
+     bfd *abfd;
+     struct bfd_link_info *info;
+{
+  struct elf_link_hash_table *htab;
+  struct eh_frame_hdr_info *hdr_info;
+  asection *sec;
+
+  htab = elf_hash_table (info);
+  hdr_info = &htab->eh_info;
+  sec = hdr_info->hdr_sec;
+  if (sec == NULL)
+    return FALSE;
+
+  sec->_cooked_size = EH_FRAME_HDR_SIZE;
+  if (hdr_info->table)
+    sec->_cooked_size += 4 + hdr_info->fde_count * 8;
+
+  /* Request program headers to be recalculated.  */
+  elf_tdata (abfd)->program_header_size = 0;
+  elf_tdata (abfd)->eh_frame_hdr = sec;
+  return TRUE;
+}
+
+/* This function is called from size_dynamic_sections.
+   It needs to decide whether .eh_frame_hdr should be output or not,
+   because later on it is too late for calling _bfd_strip_section_from_output,
+   since dynamic symbol table has been sized.  */
+
+bfd_boolean
+_bfd_elf_maybe_strip_eh_frame_hdr (info)
+     struct bfd_link_info *info;
+{
+  asection *o;
+  bfd *abfd;
+  struct elf_link_hash_table *htab;
+  struct eh_frame_hdr_info *hdr_info;
+
+  htab = elf_hash_table (info);
+  hdr_info = &htab->eh_info;
+  if (hdr_info->hdr_sec == NULL)
+    return TRUE;
+
+  if (bfd_is_abs_section (hdr_info->hdr_sec->output_section))
+    {
+      hdr_info->hdr_sec = NULL;
+      return TRUE;
+    }
+
+  abfd = NULL;
+  if (info->eh_frame_hdr)
+    for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
+      {
+	/* Count only sections which have at least a single CIE or FDE.
+	   There cannot be any CIE or FDE <= 8 bytes.  */
+	o = bfd_get_section_by_name (abfd, ".eh_frame");
+	if (o && o->_raw_size > 8 && !bfd_is_abs_section (o->output_section))
+	  break;
+      }
+
+  if (abfd == NULL)
+    {
+      _bfd_strip_section_from_output (info, hdr_info->hdr_sec);
+      hdr_info->hdr_sec = NULL;
+      return TRUE;
+    }
+
+  hdr_info->table = TRUE;
+  return TRUE;
+}
+
+/* Adjust an address in the .eh_frame section.  Given OFFSET within
+   SEC, this returns the new offset in the adjusted .eh_frame section,
+   or -1 if the address refers to a CIE/FDE which has been removed
+   or to offset with dynamic relocation which is no longer needed.  */
+
+bfd_vma
+_bfd_elf_eh_frame_section_offset (output_bfd, sec, offset)
+     bfd *output_bfd ATTRIBUTE_UNUSED;
+     asection *sec;
+     bfd_vma offset;
+{
+  struct eh_frame_sec_info *sec_info;
+  unsigned int lo, hi, mid;
+
+  if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME)
+    return offset;
+  sec_info = (struct eh_frame_sec_info *)
+	     elf_section_data (sec)->sec_info;
+
+  if (offset >= sec->_raw_size)
+    return offset - (sec->_cooked_size - sec->_raw_size);
+
+  lo = 0;
+  hi = sec_info->count;
+  mid = 0;
+  while (lo < hi)
+    {
+      mid = (lo + hi) / 2;
+      if (offset < sec_info->entry[mid].offset)
+	hi = mid;
+      else if (offset
+	       >= sec_info->entry[mid].offset + sec_info->entry[mid].size)
+	lo = mid + 1;
+      else
+	break;
+    }
+
+  BFD_ASSERT (lo < hi);
+
+  /* FDE or CIE was removed.  */
+  if (sec_info->entry[mid].removed)
+    return (bfd_vma) -1;
+
+  /* If converting to DW_EH_PE_pcrel, there will be no need for run-time
+     relocation against FDE's initial_location field.  */
+  if (sec_info->entry[mid].make_relative
+      && ! sec_info->entry[mid].cie
+      && offset == sec_info->entry[mid].offset + 8)
+    return (bfd_vma) -2;
+
+  /* If converting LSDA pointers to DW_EH_PE_pcrel, there will be no need
+     for run-time relocation against LSDA field.  */
+  if (sec_info->entry[mid].make_lsda_relative
+      && ! sec_info->entry[mid].cie
+      && (offset == (sec_info->entry[mid].offset + 8
+		     + sec_info->entry[mid].lsda_offset)))
+    return (bfd_vma) -2;
+
+  return (offset + sec_info->entry[mid].new_offset
+	  - sec_info->entry[mid].offset);
+}
+
+/* Write out .eh_frame section.  This is called with the relocated
+   contents.  */
+
+bfd_boolean
+_bfd_elf_write_section_eh_frame (abfd, info, sec, contents)
+     bfd *abfd;
+     struct bfd_link_info *info;
+     asection *sec;
+     bfd_byte *contents;
+{
+  struct eh_frame_sec_info *sec_info;
+  struct elf_link_hash_table *htab;
+  struct eh_frame_hdr_info *hdr_info;
+  unsigned int i;
+  bfd_byte *p, *buf;
+  unsigned int leb128_tmp;
+  unsigned int cie_offset = 0;
+  unsigned int ptr_size;
+
+  ptr_size = (elf_elfheader (sec->owner)->e_ident[EI_CLASS]
+	      == ELFCLASS64) ? 8 : 4;
+
+  if (sec->sec_info_type != ELF_INFO_TYPE_EH_FRAME)
+    return bfd_set_section_contents (abfd, sec->output_section,
+				     contents,
+				     (file_ptr) sec->output_offset,
+				     sec->_raw_size);
+  sec_info = (struct eh_frame_sec_info *)
+	     elf_section_data (sec)->sec_info;
+  htab = elf_hash_table (info);
+  hdr_info = &htab->eh_info;
+  if (hdr_info->table && hdr_info->array == NULL)
+    hdr_info->array
+      = bfd_malloc (hdr_info->fde_count * sizeof(*hdr_info->array));
+  if (hdr_info->array == NULL)
+    hdr_info = NULL;
+
+  p = contents;
+  for (i = 0; i < sec_info->count; ++i)
+    {
+      if (sec_info->entry[i].removed)
+	{
+	  if (sec_info->entry[i].cie)
+	    {
+	      /* If CIE is removed due to no remaining FDEs referencing it
+		 and there were no CIEs kept before it, sec_info->entry[i].sec
+		 will be zero.  */
+	      if (sec_info->entry[i].sec == NULL)
+		cie_offset = 0;
+	      else
+		{
+		  cie_offset = sec_info->entry[i].new_offset;
+		  cie_offset += (sec_info->entry[i].sec->output_section->vma
+				 + sec_info->entry[i].sec->output_offset
+				 - sec->output_section->vma
+				 - sec->output_offset);
+		}
+	    }
+	  continue;
+	}
+
+      if (sec_info->entry[i].cie)
+	{
+	  /* CIE */
+	  cie_offset = sec_info->entry[i].new_offset;
+	  if (sec_info->entry[i].make_relative
+	      || sec_info->entry[i].make_lsda_relative
+	      || sec_info->entry[i].per_encoding_relative)
+	    {
+	      unsigned char *aug;
+	      unsigned int action;
+	      unsigned int dummy, per_width, per_encoding;
+
+	      /* Need to find 'R' or 'L' augmentation's argument and modify
+		 DW_EH_PE_* value.  */
+	      action = (sec_info->entry[i].make_relative ? 1 : 0)
+		       | (sec_info->entry[i].make_lsda_relative ? 2 : 0)
+		       | (sec_info->entry[i].per_encoding_relative ? 4 : 0);
+	      buf = contents + sec_info->entry[i].offset;
+	      /* Skip length, id and version.  */
+	      buf += 9;
+	      aug = buf;
+	      buf = strchr (buf, '\0') + 1;
+	      read_uleb128 (dummy, buf);
+	      read_sleb128 (dummy, buf);
+	      read_uleb128 (dummy, buf);
+	      if (*aug == 'z')
+		{
+		  read_uleb128 (dummy, buf);
+		  aug++;
+		}
+
+	      while (action)
+		switch (*aug++)
+		  {
+		  case 'L':
+		    if (action & 2)
+		      {
+			BFD_ASSERT (*buf == sec_info->entry[i].lsda_encoding);
+			*buf |= DW_EH_PE_pcrel;
+			action &= ~2;
+		      }
+		    buf++;
+		    break;
+		  case 'P':
+		    per_encoding = *buf++;
+                    per_width = get_DW_EH_PE_width (per_encoding,
+						    ptr_size);
+		    BFD_ASSERT (per_width != 0);
+		    BFD_ASSERT (((per_encoding & 0x70) == DW_EH_PE_pcrel)
+				== sec_info->entry[i].per_encoding_relative);
+		    if ((per_encoding & 0xf0) == DW_EH_PE_aligned)
+		      buf = (contents
+			     + ((buf - contents + per_width - 1)
+				& ~((bfd_size_type) per_width - 1)));
+		    if (action & 4)
+		      {
+			bfd_vma value;
+
+			value = read_value (abfd, buf, per_width,
+					    get_DW_EH_PE_signed
+					    (per_encoding));
+			value += (sec_info->entry[i].offset
+				  - sec_info->entry[i].new_offset);
+			write_value (abfd, buf, value, per_width);
+			action &= ~4;
+		      }
+		    buf += per_width;
+		    break;
+		  case 'R':
+		    if (action & 1)
+		      {
+			BFD_ASSERT (*buf == sec_info->entry[i].fde_encoding);
+			*buf |= DW_EH_PE_pcrel;
+			action &= ~1;
+		      }
+		    buf++;
+		    break;
+		  default:
+		    BFD_FAIL ();
+		  }
+	    }
+	}
+      else if (sec_info->entry[i].size > 4)
+	{
+	  /* FDE */
+	  bfd_vma value = 0, address;
+	  unsigned int width;
+
+	  buf = contents + sec_info->entry[i].offset;
+	  /* Skip length.  */
+	  buf += 4;
+	  bfd_put_32 (abfd,
+		      sec_info->entry[i].new_offset + 4 - cie_offset, buf);
+	  buf += 4;
+	  width = get_DW_EH_PE_width (sec_info->entry[i].fde_encoding,
+				      ptr_size);
+	  address = value = read_value (abfd, buf, width,
+					get_DW_EH_PE_signed
+					(sec_info->entry[i].fde_encoding));
+	  if (value)
+	    {
+	      switch (sec_info->entry[i].fde_encoding & 0xf0)
+		{
+		case DW_EH_PE_indirect:
+		case DW_EH_PE_textrel:
+		  BFD_ASSERT (hdr_info == NULL);
+		  break;
+		case DW_EH_PE_datarel:
+		  {
+		    asection *got = bfd_get_section_by_name (abfd, ".got");
+
+		    BFD_ASSERT (got != NULL);
+		    address += got->vma;
+		  }
+		  break;
+		case DW_EH_PE_pcrel:
+		  value += (sec_info->entry[i].offset
+			    - sec_info->entry[i].new_offset);
+		  address += (sec->output_section->vma + sec->output_offset
+			      + sec_info->entry[i].offset + 8);
+		  break;
+		}
+	      if (sec_info->entry[i].make_relative)
+		value -= (sec->output_section->vma + sec->output_offset
+			  + sec_info->entry[i].new_offset + 8);
+	      write_value (abfd, buf, value, width);
+	    }
+
+	  if (hdr_info)
+	    {
+	      hdr_info->array[hdr_info->array_count].initial_loc = address;
+	      hdr_info->array[hdr_info->array_count++].fde
+		= (sec->output_section->vma + sec->output_offset
+		   + sec_info->entry[i].new_offset);
+	    }
+
+	  if ((sec_info->entry[i].lsda_encoding & 0xf0) == DW_EH_PE_pcrel
+	      || sec_info->entry[i].make_lsda_relative)
+	    {
+	      buf += sec_info->entry[i].lsda_offset;
+	      width = get_DW_EH_PE_width (sec_info->entry[i].lsda_encoding,
+					  ptr_size);
+	      value = read_value (abfd, buf, width,
+				  get_DW_EH_PE_signed
+				  (sec_info->entry[i].lsda_encoding));
+	      if (value)
+		{
+		  if ((sec_info->entry[i].lsda_encoding & 0xf0)
+		      == DW_EH_PE_pcrel)
+		    value += (sec_info->entry[i].offset
+			      - sec_info->entry[i].new_offset);
+		  else if (sec_info->entry[i].make_lsda_relative)
+		    value -= (sec->output_section->vma + sec->output_offset
+			      + sec_info->entry[i].new_offset + 8
+			      + sec_info->entry[i].lsda_offset);
+		  write_value (abfd, buf, value, width);
+		}
+	    }
+	}
+      else
+	/* Terminating FDE must be at the end of .eh_frame section only.  */
+	BFD_ASSERT (i == sec_info->count - 1);
+
+      BFD_ASSERT (p == contents + sec_info->entry[i].new_offset);
+      memmove (p, contents + sec_info->entry[i].offset,
+	       sec_info->entry[i].size);
+      p += sec_info->entry[i].size;
+    }
+
+  /* FIXME: Once _bfd_elf_discard_section_eh_frame will be able to
+     shrink sections to zero size, this won't be needed any more.  */
+  if (p == contents && sec->_cooked_size == 16)
+    {
+      bfd_put_32 (abfd, 12, p);		/* Fake CIE length */
+      bfd_put_32 (abfd, 0, p + 4);	/* Fake CIE id */
+      p[8] = 1;				/* Fake CIE version */
+      memset (p + 9, 0, 7);		/* Fake CIE augmentation, 3xleb128
+					   and 3xDW_CFA_nop as pad  */
+      p += 16;
+    }
+
+  BFD_ASSERT ((bfd_size_type) (p - contents) == sec->_cooked_size);
+
+  return bfd_set_section_contents (abfd, sec->output_section,
+                                   contents, (file_ptr) sec->output_offset,
+                                   sec->_cooked_size);
+}
+
+/* Helper function used to sort .eh_frame_hdr search table by increasing
+   VMA of FDE initial location.  */
+
+static int
+vma_compare (a, b)
+     const PTR a;
+     const PTR b;
+{
+  struct eh_frame_array_ent *p = (struct eh_frame_array_ent *) a;
+  struct eh_frame_array_ent *q = (struct eh_frame_array_ent *) b;
+  if (p->initial_loc > q->initial_loc)
+    return 1;
+  if (p->initial_loc < q->initial_loc)
+    return -1;
+  return 0;
+}
+
+/* Write out .eh_frame_hdr section.  This must be called after
+   _bfd_elf_write_section_eh_frame has been called on all input
+   .eh_frame sections.
+   .eh_frame_hdr format:
+   ubyte version		(currently 1)
+   ubyte eh_frame_ptr_enc  	(DW_EH_PE_* encoding of pointer to start of
+				 .eh_frame section)
+   ubyte fde_count_enc		(DW_EH_PE_* encoding of total FDE count
+				 number (or DW_EH_PE_omit if there is no
+				 binary search table computed))
+   ubyte table_enc		(DW_EH_PE_* encoding of binary search table,
+				 or DW_EH_PE_omit if not present.
+				 DW_EH_PE_datarel is using address of
+				 .eh_frame_hdr section start as base)
+   [encoded] eh_frame_ptr	(pointer to start of .eh_frame section)
+   optionally followed by:
+   [encoded] fde_count		(total number of FDEs in .eh_frame section)
+   fde_count x [encoded] initial_loc, fde
+				(array of encoded pairs containing
+				 FDE initial_location field and FDE address,
+				 sorted by increasing initial_loc).  */
+
+bfd_boolean
+_bfd_elf_write_section_eh_frame_hdr (abfd, info)
+     bfd *abfd;
+     struct bfd_link_info *info;
+{
+  struct elf_link_hash_table *htab;
+  struct eh_frame_hdr_info *hdr_info;
+  asection *sec;
+  bfd_byte *contents;
+  asection *eh_frame_sec;
+  bfd_size_type size;
+  bfd_boolean retval;
+
+  htab = elf_hash_table (info);
+  hdr_info = &htab->eh_info;
+  sec = hdr_info->hdr_sec;
+  if (sec == NULL)
+    return TRUE;
+
+  size = EH_FRAME_HDR_SIZE;
+  if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count)
+    size += 4 + hdr_info->fde_count * 8;
+  contents = bfd_malloc (size);
+  if (contents == NULL)
+    return FALSE;
+
+  eh_frame_sec = bfd_get_section_by_name (abfd, ".eh_frame");
+  if (eh_frame_sec == NULL)
+    {
+      free (contents);
+      return FALSE;
+    }
+
+  memset (contents, 0, EH_FRAME_HDR_SIZE);
+  contents[0] = 1;				/* Version.  */
+  contents[1] = DW_EH_PE_pcrel | DW_EH_PE_sdata4; /* .eh_frame offset.  */
+  if (hdr_info->array && hdr_info->array_count == hdr_info->fde_count)
+    {
+      contents[2] = DW_EH_PE_udata4;		/* FDE count encoding.  */
+      contents[3] = DW_EH_PE_datarel | DW_EH_PE_sdata4; /* Search table enc.  */
+    }
+  else
+    {
+      contents[2] = DW_EH_PE_omit;
+      contents[3] = DW_EH_PE_omit;
+    }
+  bfd_put_32 (abfd, eh_frame_sec->vma - sec->output_section->vma - 4,
+	      contents + 4);
+  if (contents[2] != DW_EH_PE_omit)
+    {
+      unsigned int i;
+
+      bfd_put_32 (abfd, hdr_info->fde_count, contents + EH_FRAME_HDR_SIZE);
+      qsort (hdr_info->array, hdr_info->fde_count, sizeof (*hdr_info->array),
+	     vma_compare);
+      for (i = 0; i < hdr_info->fde_count; i++)
+	{
+	  bfd_put_32 (abfd,
+		      hdr_info->array[i].initial_loc
+		      - sec->output_section->vma,
+		      contents + EH_FRAME_HDR_SIZE + i * 8 + 4);
+	  bfd_put_32 (abfd,
+		      hdr_info->array[i].fde - sec->output_section->vma,
+		      contents + EH_FRAME_HDR_SIZE + i * 8 + 8);
+	}
+    }
+
+  retval = bfd_set_section_contents (abfd, sec->output_section,
+				     contents, (file_ptr) sec->output_offset,
+				     sec->_cooked_size);
+  free (contents);
+  return retval;
+}