bfd/ChangeLog:

	* compress.c (bfd_uncompress_section_contents): Add ATTRIBUTE_UNUSED.
	* dwarf2.c (read_and_uncompress_section): New function.
	(read_section): Call it.
	(find_line): Likewise.

binutils/ChangeLog:

	* objdump.c (load_specific_debug_section): Decompress section contents
	before applying relocations.
	* readelf.c (load_specific_debug_section): Update section size after
	decompression.

gas/ChangeLog:

	* Makefile.am: Add compress-debug.c and compress-debug.h.
	* Makefile.in: Regenerate.
	* config.in: Add HAVE_ZLIB_H.
	* configure.in: Check for zlib.h.
	* configure: Regenerate.

	* as.c (parse_args): Add --compress-debug-sections and
	--nocompress-debug-sections.
	* as.h (flag_compress_debug): New variable.
	* compress-debug.c: New file.
	* compress-debug.h: New file.
	* write.c: Include compress-debug.h.
	(compress_frag): New function.
	(compress_debug): New function.
	(write_object_file): Compress debug sections if requested.

1 files changed, 56 insertions, 36 deletions

diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index 9b194aaa66..ffe110857e 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -405,6 +405,54 @@ lookup_info_hash_table (struct info_hash_table *hash_table, const char *key)
   return entry ? entry->head : NULL;
 }
 
+/* Read a section, uncompress it if necessary, and relocate it.  */
+
+static bfd_boolean
+read_and_uncompress_section (bfd *           abfd,
+			     asection *      msec,
+			     bfd_boolean     section_is_compressed,
+			     asymbol **      syms,
+			     bfd_byte **     section_buffer,
+			     bfd_size_type * section_size)
+{
+  /* Get the unrelocated contents of the section.  */
+  *section_buffer = (bfd_byte *) bfd_malloc (*section_size);
+  if (! *section_buffer)
+    return FALSE;
+  if (! bfd_get_section_contents (abfd, msec, *section_buffer,
+				  0, *section_size))
+    return FALSE;
+
+  if (section_is_compressed)
+    {
+      if (! bfd_uncompress_section_contents (section_buffer, section_size))
+	{
+	  (*_bfd_error_handler) (_("Dwarf Error: unable to decompress %s section."),
+				 bfd_get_section_name (abfd, msec));
+	  bfd_set_error (bfd_error_bad_value);
+	  return FALSE;
+	}
+    }
+
+  if (syms)
+    {
+      /* We want to relocate the data we've already read (and
+	 decompressed), so we store a pointer to the data in
+	 the bfd_section, and tell it that the contents are
+	 already in memory.  */
+      BFD_ASSERT (msec->contents == NULL && (msec->flags & SEC_IN_MEMORY) == 0);
+      msec->contents = *section_buffer;
+      msec->flags |= SEC_IN_MEMORY;
+      msec->size = *section_size;
+      *section_buffer
+	  = bfd_simple_get_relocated_section_contents (abfd, msec, NULL, syms);
+      if (! *section_buffer)
+	return FALSE;
+    }
+
+  return TRUE;
+}
+
 /* Read a section into its appropriate place in the dwarf2_debug
    struct (indicated by SECTION_BUFFER and SECTION_SIZE).  If SYMS is
    not NULL, use bfd_simple_get_relocated_section_contents to read the
@@ -440,32 +488,10 @@ read_section (bfd *           abfd,
 	}
 
       *section_size = msec->rawsize ? msec->rawsize : msec->size;
-      if (syms)
-	{
-	  *section_buffer
-	      = bfd_simple_get_relocated_section_contents (abfd, msec, NULL, syms);
-	  if (! *section_buffer)
-	    return FALSE;
-	}
-      else
-	{
-	  *section_buffer = (bfd_byte *) bfd_malloc (*section_size);
-	  if (! *section_buffer)
-	    return FALSE;
-	  if (! bfd_get_section_contents (abfd, msec, *section_buffer,
-					  0, *section_size))
-	    return FALSE;
-	}
 
-      if (section_is_compressed)
-	{
-	  if (! bfd_uncompress_section_contents (section_buffer, section_size))
-	    {
-	      (*_bfd_error_handler) (_("Dwarf Error: unable to decompress %s section."), compressed_section_name);
-	      bfd_set_error (bfd_error_bad_value);
-	      return FALSE;
-	    }
-	}
+      if (! read_and_uncompress_section (abfd, msec, section_is_compressed,
+					 syms, section_buffer, section_size))
+	return FALSE;
     }
 
   /* It is possible to get a bad value for the offset into the section
@@ -3242,23 +3268,17 @@ find_line (bfd *abfd,
 		{
 		  bfd_size_type size = msec->size;
 		  bfd_byte *buffer, *tmp;
+		  bfd_boolean is_compressed =
+		      strcmp (msec->name, DWARF2_COMPRESSED_DEBUG_INFO) == 0;
 
 		  if (size == 0)
 		    continue;
 
-		  buffer = (bfd_simple_get_relocated_section_contents
-			    (debug_bfd, msec, NULL, symbols));
-		  if (! buffer)
+		  if (! read_and_uncompress_section (debug_bfd, msec,
+		  				     is_compressed, symbols,
+		  				     &buffer, &size))
 		    goto done;
 
-		  if (strcmp (msec->name, DWARF2_COMPRESSED_DEBUG_INFO) == 0)
-		    {
-		      if (! bfd_uncompress_section_contents (&buffer, &size))
-			{
-			  free (buffer);
-			  goto done;
-			}
-		    }
 		  tmp = (bfd_byte *) bfd_realloc (stash->info_ptr_memory,
 						  total_size + size);
 		  if (tmp == NULL)