X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=bfd%2Fmerge.c;h=632c852390355829f95e149b7d72f0982a1a0b2b;hb=93cb9841d68263174a600dc70af742a8e2eabfc6;hp=7aa088ff94734a50eb070351849507b567498f38;hpb=3409e291c1c178630a26ca916cd178c0c07e2fd9;p=deliverable%2Fbinutils-gdb.git

diff --git a/bfd/merge.c b/bfd/merge.c
index 7aa088ff94..632c852390 100644
--- a/bfd/merge.c
+++ b/bfd/merge.c
@@ -1,6 +1,5 @@
 /* SEC_MERGE support.
-   Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
-   Free Software Foundation, Inc.
+   Copyright (C) 2001-2019 Free Software Foundation, Inc.
    Written by Jakub Jelinek <jakub@redhat.com>.
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -25,7 +24,9 @@
    as used in ELF SHF_MERGE.  */
 
 #include "sysdep.h"
+#include <limits.h>
 #include "bfd.h"
+#include "elf-bfd.h"
 #include "libbfd.h"
 #include "hashtab.h"
 #include "libiberty.h"
@@ -109,7 +110,7 @@ sec_merge_hash_newfunc (struct bfd_hash_entry *entry,
      subclass.  */
   if (entry == NULL)
     entry = (struct bfd_hash_entry *)
-        bfd_hash_allocate (table, sizeof (struct sec_merge_hash_entry));
+	bfd_hash_allocate (table, sizeof (struct sec_merge_hash_entry));
   if (entry == NULL)
     return NULL;
 
@@ -284,20 +285,23 @@ sec_merge_add (struct sec_merge_hash *tab, const char *str,
 }
 
 static bfd_boolean
-sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry)
+sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry,
+		unsigned char *contents, file_ptr offset)
 {
   struct sec_merge_sec_info *secinfo = entry->secinfo;
   asection *sec = secinfo->sec;
   char *pad = NULL;
   bfd_size_type off = 0;
   int alignment_power = sec->output_section->alignment_power;
+  bfd_size_type pad_len;
 
-  if (alignment_power)
-    {
-      pad = (char *) bfd_zmalloc ((bfd_size_type) 1 << alignment_power);
-      if (pad == NULL)
-	return FALSE;
-    }
+  /* FIXME: If alignment_power is 0 then really we should scan the
+     entry list for the largest required alignment and use that.  */
+  pad_len = alignment_power ? ((bfd_size_type) 1 << alignment_power) : 16;
+
+  pad = (char *) bfd_zmalloc (pad_len);
+  if (pad == NULL)
+    return FALSE;
 
   for (; entry != NULL && entry->secinfo == secinfo; entry = entry->next)
     {
@@ -307,7 +311,13 @@ sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry)
       len = -off & (entry->alignment - 1);
       if (len != 0)
 	{
-	  if (bfd_bwrite (pad, len, abfd) != len)
+	  BFD_ASSERT (len <= pad_len);
+	  if (contents)
+	    {
+	      memcpy (contents + offset, pad, len);
+	      offset += len;
+	    }
+	  else if (bfd_bwrite (pad, len, abfd) != len)
 	    goto err;
 	  off += len;
 	}
@@ -315,7 +325,12 @@ sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry)
       str = entry->root.string;
       len = entry->len;
 
-      if (bfd_bwrite (str, len, abfd) != len)
+      if (contents)
+	{
+	  memcpy (contents + offset, str, len);
+	  offset += len;
+	}
+      else if (bfd_bwrite (str, len, abfd) != len)
 	goto err;
 
       off += len;
@@ -323,17 +338,20 @@ sec_merge_emit (bfd *abfd, struct sec_merge_hash_entry *entry)
 
   /* Trailing alignment needed?  */
   off = sec->size - off;
-  if (off != 0
-      && bfd_bwrite (pad, off, abfd) != off)
-    goto err;
+  if (off != 0)
+    {
+      BFD_ASSERT (off <= pad_len);
+      if (contents)
+	memcpy (contents + offset, pad, off);
+      else if (bfd_bwrite (pad, off, abfd) != off)
+	goto err;
+    }
 
-  if (pad != NULL)
-    free (pad);
+  free (pad);
   return TRUE;
 
  err:
-  if (pad != NULL)
-    free (pad);
+  free (pad);
   return FALSE;
 }
 
@@ -348,6 +366,7 @@ _bfd_add_merge_section (bfd *abfd, void **psinfo, asection *sec,
   struct sec_merge_sec_info *secinfo;
   unsigned int align;
   bfd_size_type amt;
+  bfd_byte *contents;
 
   if ((abfd->flags & DYNAMIC) != 0
       || (sec->flags & SEC_MERGE) == 0)
@@ -358,18 +377,27 @@ _bfd_add_merge_section (bfd *abfd, void **psinfo, asection *sec,
       || sec->entsize == 0)
     return TRUE;
 
+  if (sec->size % sec->entsize != 0)
+    return TRUE;
+
   if ((sec->flags & SEC_RELOC) != 0)
     {
       /* We aren't prepared to handle relocations in merged sections.  */
       return TRUE;
     }
 
-  align = sec->alignment_power;
-  if ((sec->entsize < (unsigned) 1 << align
+#ifndef CHAR_BIT
+#define CHAR_BIT 8
+#endif
+  if (sec->alignment_power >= sizeof (align) * CHAR_BIT)
+    return TRUE;
+
+  align = 1u << sec->alignment_power;
+  if ((sec->entsize < align
        && ((sec->entsize & (sec->entsize - 1))
 	   || !(sec->flags & SEC_STRINGS)))
-      || (sec->entsize > (unsigned) 1 << align
-	  && (sec->entsize & (((unsigned) 1 << align) - 1))))
+      || (sec->entsize > align
+	  && (sec->entsize & (align - 1))))
     {
       /* Sanity check.  If string character size is smaller than
 	 alignment, then we require character size to be a power
@@ -392,7 +420,7 @@ _bfd_add_merge_section (bfd *abfd, void **psinfo, asection *sec,
     {
       /* Initialize the information we need to keep track of.  */
       sinfo = (struct sec_merge_info *)
-          bfd_alloc (abfd, sizeof (struct sec_merge_info));
+	  bfd_alloc (abfd, sizeof (struct sec_merge_info));
       if (sinfo == NULL)
 	goto error_return;
       sinfo->next = (struct sec_merge_info *) *psinfo;
@@ -432,8 +460,8 @@ _bfd_add_merge_section (bfd *abfd, void **psinfo, asection *sec,
   sec->rawsize = sec->size;
   if (sec->flags & SEC_STRINGS)
     memset (secinfo->contents + sec->size, 0, sec->entsize);
-  if (! bfd_get_section_contents (sec->owner, sec, secinfo->contents,
-				  0, sec->size))
+  contents = secinfo->contents;
+  if (! bfd_get_full_section_contents (sec->owner, sec, &contents))
     goto error_return;
 
   return TRUE;
@@ -593,7 +621,7 @@ is_suffix (const struct sec_merge_hash_entry *A,
 
 /* This is a helper function for _bfd_merge_sections.  It attempts to
    merge strings matching suffixes of longer strings.  */
-static void
+static struct sec_merge_sec_info *
 merge_strings (struct sec_merge_info *sinfo)
 {
   struct sec_merge_hash_entry **array, **a, *e;
@@ -605,7 +633,7 @@ merge_strings (struct sec_merge_info *sinfo)
   amt = sinfo->htab->size * sizeof (struct sec_merge_hash_entry *);
   array = (struct sec_merge_hash_entry **) bfd_malloc (amt);
   if (array == NULL)
-    goto alloc_failure;
+    return NULL;
 
   for (e = sinfo->htab->first, a = array; e; e = e->next)
     if (e->alignment)
@@ -650,9 +678,7 @@ merge_strings (struct sec_merge_info *sinfo)
 	}
     }
 
-alloc_failure:
-  if (array)
-    free (array);
+  free (array);
 
   /* Now assign positions to the strings we want to keep.  */
   size = 0;
@@ -677,11 +703,6 @@ alloc_failure:
 	}
     }
   secinfo->sec->size = size;
-  if (secinfo->sec->alignment_power != 0)
-    {
-      bfd_size_type align = (bfd_size_type) 1 << secinfo->sec->alignment_power;
-      secinfo->sec->size = (secinfo->sec->size + align - 1) & -align;
-    }
 
   /* And now adjust the rest, removing them from the chain (but not hashtable)
      at the same time.  */
@@ -698,6 +719,7 @@ alloc_failure:
 	    e->u.index = e->u.suffix->u.index + (e->u.suffix->len - e->len);
 	  }
       }
+  return secinfo;
 }
 
 /* This function is called once after all SEC_MERGE sections are registered
@@ -713,7 +735,8 @@ _bfd_merge_sections (bfd *abfd,
 
   for (sinfo = (struct sec_merge_info *) xsinfo; sinfo; sinfo = sinfo->next)
     {
-      struct sec_merge_sec_info * secinfo;
+      struct sec_merge_sec_info *secinfo;
+      bfd_size_type align;
 
       if (! sinfo->chain)
 	continue;
@@ -724,6 +747,7 @@ _bfd_merge_sections (bfd *abfd,
       secinfo->next = NULL;
 
       /* Record the sections into the hash table.  */
+      align = 1;
       for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
 	if (secinfo->sec->flags & SEC_EXCLUDE)
 	  {
@@ -731,17 +755,27 @@ _bfd_merge_sections (bfd *abfd,
 	    if (remove_hook)
 	      (*remove_hook) (abfd, secinfo->sec);
 	  }
-	else if (! record_section (sinfo, secinfo))
-	  break;
-
-      if (secinfo)
-	continue;
+	else
+	  {
+	    if (!record_section (sinfo, secinfo))
+	      return FALSE;
+	    if (align)
+	      {
+		align = (bfd_size_type) 1 << secinfo->sec->alignment_power;
+		if ((secinfo->sec->size & (align - 1)) != 0)
+		  align = 0;
+	      }
+	  }
 
       if (sinfo->htab->first == NULL)
 	continue;
 
       if (sinfo->htab->strings)
-	merge_strings (sinfo);
+	{
+	  secinfo = merge_strings (sinfo);
+	  if (!secinfo)
+	    return FALSE;
+	}
       else
 	{
 	  struct sec_merge_hash_entry *e;
@@ -759,8 +793,7 @@ _bfd_merge_sections (bfd *abfd,
 		  e->secinfo->first_str = e;
 		  size = 0;
 		}
-	      size = (size + e->alignment - 1)
-		     & ~((bfd_vma) e->alignment - 1);
+	      size = (size + e->alignment - 1) & ~((bfd_vma) e->alignment - 1);
 	      e->u.index = size;
 	      size += e->len;
 	      secinfo = e->secinfo;
@@ -768,11 +801,16 @@ _bfd_merge_sections (bfd *abfd,
 	  secinfo->sec->size = size;
 	}
 
-	/* Finally remove all input sections which have not made it into
-	   the hash table at all.  */
-	for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
-	  if (secinfo->first_str == NULL)
-	    secinfo->sec->flags |= SEC_EXCLUDE | SEC_KEEP;
+      /* If the input sections were padded according to their alignments,
+	 then pad the output too.  */
+      if (align)
+	secinfo->sec->size = (secinfo->sec->size + align - 1) & -align;
+
+      /* Finally remove all input sections which have not made it into
+	 the hash table at all.  */
+      for (secinfo = sinfo->chain; secinfo; secinfo = secinfo->next)
+	if (secinfo->first_str == NULL)
+	  secinfo->sec->flags |= SEC_EXCLUDE | SEC_KEEP;
     }
 
   return TRUE;
@@ -785,6 +823,8 @@ _bfd_write_merged_section (bfd *output_bfd, asection *sec, void *psecinfo)
 {
   struct sec_merge_sec_info *secinfo;
   file_ptr pos;
+  unsigned char *contents;
+  Elf_Internal_Shdr *hdr;
 
   secinfo = (struct sec_merge_sec_info *) psecinfo;
 
@@ -795,11 +835,26 @@ _bfd_write_merged_section (bfd *output_bfd, asection *sec, void *psecinfo)
     return TRUE;
 
   /* FIXME: octets_per_byte.  */
-  pos = sec->output_section->filepos + sec->output_offset;
-  if (bfd_seek (output_bfd, pos, SEEK_SET) != 0)
-    return FALSE;
+  hdr = &elf_section_data (sec->output_section)->this_hdr;
+  if (hdr->sh_offset == (file_ptr) -1)
+    {
+      /* We must compress this section.  Write output to the
+	 buffer.  */
+      contents = hdr->contents;
+      if ((sec->output_section->flags & SEC_ELF_COMPRESS) == 0
+	  || contents == NULL)
+	abort ();
+    }
+  else
+    {
+      contents = NULL;
+      pos = sec->output_section->filepos + sec->output_offset;
+      if (bfd_seek (output_bfd, pos, SEEK_SET) != 0)
+	return FALSE;
+    }
 
-  if (! sec_merge_emit (output_bfd, secinfo->first_str))
+  if (! sec_merge_emit (output_bfd, secinfo->first_str, contents,
+			sec->output_offset))
     return FALSE;
 
   return TRUE;
@@ -826,11 +881,10 @@ _bfd_merged_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, asection **psec,
   if (offset >= sec->rawsize)
     {
       if (offset > sec->rawsize)
-	{
-	  (*_bfd_error_handler)
-	    (_("%s: access beyond end of merged section (%ld)"),
-	     bfd_get_filename (sec->owner), (long) offset);
-	}
+	_bfd_error_handler
+	  /* xgettext:c-format */
+	  (_("%pB: access beyond end of merged section (%" PRId64 ")"),
+	   sec->owner, (int64_t) offset);
       return secinfo->first_str ? sec->size : 0;
     }
 
@@ -884,3 +938,17 @@ _bfd_merged_section_offset (bfd *output_bfd ATTRIBUTE_UNUSED, asection **psec,
   *psec = entry->secinfo->sec;
   return entry->u.index + (secinfo->contents + offset - p);
 }
+
+/* Tidy up when done.  */
+
+void
+_bfd_merge_sections_free (void *xsinfo)
+{
+  struct sec_merge_info *sinfo;
+
+  for (sinfo = (struct sec_merge_info *) xsinfo; sinfo; sinfo = sinfo->next)
+    {
+      bfd_hash_table_free (&sinfo->htab->table);
+      free (sinfo->htab);
+    }
+}