Add --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi]

This patch adds --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi] to ld for ELF targets to support generating compressed DWARF debug sections. We always generate .zdebug_* section since section names have been finalized and they can't be changed easily when compression is being performed. bfd/ * bfd-in.h (compressed_debug_section_type): New. * compress.c (bfd_compress_section_contents): Add an argument for linker write compression and always generate .zdebug_* section when linking. (bfd_init_section_compress_status): Pass FALSE to bfd_compress_section_contents. (bfd_compress_section): New function. * elf.c (elf_fake_sections): For linking, set SEC_ELF_COMPRESS on DWARF debug sections if COMPRESS_DEBUG is set and rename section if COMPRESS_DEBUG_GABI_ZLIB isn't set. (assign_file_positions_for_non_load_sections): Set sh_offset to -1 if SEC_ELF_COMPRESS is set. (assign_file_positions_except_relocs): Likwise. (_bfd_elf_assign_file_positions_for_relocs): Renamed to ... (_bfd_elf_assign_file_positions_for_non_load): This. Change return time to bfd_boolean. Compress the section if SEC_ELF_COMPRESS is set. (_bfd_elf_write_object_contents): Updated. (_bfd_elf_set_section_contents): Write section contents to the buffer if SEC_ELF_COMPRESS is set. * merge.c: Include "elf-bfd.h". (sec_merge_emit): Add arguments for contents and offset. Write to contents with offset if contents isn't NULL. (_bfd_write_merged_section): Write section contents to the buffer if SEC_ELF_COMPRESS is set. Pass contents and output_offset to sec_merge_emit. * elflink.c (bfd_elf_final_link): Allocate the buffer for output section contents if SEC_ELF_COMPRESS is set. * section.c (SEC_ELF_COMPRESS): New. * bfd-in2.h: Regenerated. gas/ * as.h (compressed_debug_section_type): Removed. include/ * bfdlink.h (bfd_link_info): Add compress_debug. ld/ * ld.texinfo: Document --compress-debug-sections=. * ldmain.c (main): Set BFD_COMPRESS on output_bfd if COMPRESS_DEBUG is set. Set BFD_COMPRESS_GABI on output_bfd for COMPRESS_DEBUG_GABI_ZLIB. * lexsup.c (elf_static_list_options): Add --compress-debug-sections=. * emultempl/elf32.em (OPTION_COMPRESS_DEBUG): New. (xtra_long): Add "compress-debug-sections". (gld${EMULATION_NAME}_handle_option): Handle OPTION_COMPRESS_DEBUG. ld/testsuite/ * ld-elf/compress.exp (build_tests): Add tests for --compress-debug-sections=. (run_tests): Likewise. Add additonal tests for --compress-debug-sections=. * ld-elf/gabiend.rt: New file. * ld-elf/gabinormal.rt: Likewise. * ld-elf/gnubegin.rS: Likewise. * ld-elf/gnunormal.rS: Likewise. * ld-elf/zlibbegin.rS: Likewise. * ld-elf/zlibnormal.rS: Likewise.
2015-04-14 22:01:25 -07:00 · 2015-04-14 22:01:25 -07:00 · 0ce398f106
commit 0ce398f106
parent ecd272101d
25 changed files with 517 additions and 32 deletions
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@ -1,3 +1,36 @@
+2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* bfd-in.h (compressed_debug_section_type): New.
+	* compress.c (bfd_compress_section_contents): Add an argument
+	for linker write compression and always generate .zdebug_*
+	section when linking.
+	(bfd_init_section_compress_status): Pass FALSE to
+	bfd_compress_section_contents.
+	(bfd_compress_section): New function.
+	* elf.c (elf_fake_sections): For linking, set SEC_ELF_COMPRESS
+	on DWARF debug sections if COMPRESS_DEBUG is set and rename
+	section if COMPRESS_DEBUG_GABI_ZLIB isn't set.
+	(assign_file_positions_for_non_load_sections): Set sh_offset
+	to -1 if SEC_ELF_COMPRESS is set.
+	(assign_file_positions_except_relocs): Likwise.
+	(_bfd_elf_assign_file_positions_for_relocs): Renamed to ...
+	(_bfd_elf_assign_file_positions_for_non_load): This.  Change
+	return time to bfd_boolean.  Compress the section if
+	SEC_ELF_COMPRESS is set.
+	(_bfd_elf_write_object_contents): Updated.
+	(_bfd_elf_set_section_contents): Write section contents to
+	the buffer if SEC_ELF_COMPRESS is set.
+	* merge.c: Include "elf-bfd.h".
+	(sec_merge_emit): Add arguments for contents and offset.  Write
+	to contents with offset if contents isn't NULL.
+	(_bfd_write_merged_section): Write section contents to the
+	buffer if SEC_ELF_COMPRESS is set.  Pass contents and
+	output_offset to sec_merge_emit.
+	* elflink.c (bfd_elf_final_link): Allocate the buffer for
+	output section contents if SEC_ELF_COMPRESS is set.
+	* section.c (SEC_ELF_COMPRESS): New.
+	* bfd-in2.h: Regenerated.
+
 2015-04-15  Alan Modra  <amodra@gmail.com>

 	* elf32-rl78.c (rl78_elf_relocate_section): Typo fix.
--- a/bfd/bfd-in.h
+++ b/bfd/bfd-in.h
@ -437,6 +437,17 @@ extern void bfd_hash_traverse
   this size.  */
 extern unsigned long bfd_hash_set_default_size (unsigned long);

+/* Types of compressed DWARF debug sections.  We currently support
+   zlib.  */
+enum compressed_debug_section_type
+{
+  COMPRESS_DEBUG_NONE = 0,
+  COMPRESS_DEBUG = 1 << 0,
+  COMPRESS_DEBUG_ZLIB = COMPRESS_DEBUG | 1 << 1,
+  COMPRESS_DEBUG_GNU_ZLIB = COMPRESS_DEBUG | 1 << 2,
+  COMPRESS_DEBUG_GABI_ZLIB = COMPRESS_DEBUG | 1 << 3
+};
+
 /* This structure is used to keep track of stabs in sections
   information while linking.  */

--- a/bfd/bfd-in2.h
+++ b/bfd/bfd-in2.h
@ -444,6 +444,17 @@ extern void bfd_hash_traverse
   this size.  */
 extern unsigned long bfd_hash_set_default_size (unsigned long);

+/* Types of compressed DWARF debug sections.  We currently support
+   zlib.  */
+enum compressed_debug_section_type
+{
+  COMPRESS_DEBUG_NONE = 0,
+  COMPRESS_DEBUG = 1 << 0,
+  COMPRESS_DEBUG_ZLIB = COMPRESS_DEBUG | 1 << 1,
+  COMPRESS_DEBUG_GNU_ZLIB = COMPRESS_DEBUG | 1 << 2,
+  COMPRESS_DEBUG_GABI_ZLIB = COMPRESS_DEBUG | 1 << 3
+};
+
 /* This structure is used to keep track of stabs in sections
   information while linking.  */

@ -1378,6 +1389,10 @@ typedef struct bfd_section
     executables or shared objects. This is for COFF only.  */
 #define SEC_COFF_SHARED 0x8000000

+  /* This section should be compressed.  This is for ELF linker
+     internal use only.  */
+#define SEC_ELF_COMPRESS 0x8000000
+
  /* When a section with this flag is being linked, then if the size of
     the input section is less than a page, it should not cross a page
     boundary.  If the size of the input section is one page or more,
@ -7316,6 +7331,9 @@ bfd_boolean bfd_init_section_decompress_status
 bfd_boolean bfd_init_section_compress_status
   (bfd *abfd, asection *section);

+bfd_boolean bfd_compress_section
+   (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer);
+
 #ifdef __cplusplus
 }
 #endif
--- a/bfd/compress.c
+++ b/bfd/compress.c
@ -72,7 +72,8 @@ decompress_contents (bfd_byte *compressed_buffer,
 static bfd_size_type
 bfd_compress_section_contents (bfd *abfd, sec_ptr sec,
 			       bfd_byte *uncompressed_buffer,
-			       bfd_size_type uncompressed_size)
+			       bfd_size_type uncompressed_size,
+			       bfd_boolean write_compress)
 {
  uLong compressed_size;
  bfd_byte *buffer;
@ -176,8 +177,11 @@ bfd_compress_section_contents (bfd *abfd, sec_ptr sec,

      compressed_size += header_size;
      /* PR binutils/18087: If compression didn't make the section smaller,
-	 just keep it uncompressed.  */
-      if (compressed_size < uncompressed_size)
+	 just keep it uncompressed.  We always generate .zdebug_* section
+	 when linking since section names have been finalized and they
+	 can't be changed easily.  */
+      if ((write_compress && compression_header_size == 0)
+	   || compressed_size < uncompressed_size)
 	{
 	  bfd_update_compression_header (abfd, buffer, sec);

@ -543,9 +547,48 @@ bfd_init_section_compress_status (bfd *abfd, sec_ptr sec)
    {
      uncompressed_size = bfd_compress_section_contents (abfd, sec,
 							 uncompressed_buffer,
-							 uncompressed_size);
+							 uncompressed_size,
+							 FALSE);
      ret = uncompressed_size != 0;
    }

  return ret;
 }
+
+/*
+FUNCTION
+	bfd_compress_section
+
+SYNOPSIS
+	bfd_boolean bfd_compress_section
+	  (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer);
+
+DESCRIPTION
+	If open for write, compress section, update section size with
+	compressed size and set compress_status to COMPRESS_SECTION_DONE.
+
+	Return @code{FALSE} if compression fail.  Otherwise, return
+	@code{TRUE}.
+*/
+
+bfd_boolean
+bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer)
+{
+  bfd_size_type uncompressed_size = sec->size;
+
+  /* Error if not opened for write.  */
+  if (abfd->direction != write_direction
+      || uncompressed_size == 0
+      || uncompressed_buffer == NULL
+      || sec->contents != NULL
+      || sec->compressed_size != 0
+      || sec->compress_status != COMPRESS_SECTION_NONE)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }
+
+  /* Compress it.  */
+  return bfd_compress_section_contents (abfd, sec, uncompressed_buffer,
+					uncompressed_size, TRUE) != 0;
+}
--- a/bfd/elf.c
+++ b/bfd/elf.c
@ -2752,6 +2752,7 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
  struct bfd_elf_section_data *esd = elf_section_data (asect);
  Elf_Internal_Shdr *this_hdr;
  unsigned int sh_type;
+  const char *name = asect->name;

  if (arg->failed)
    {
@ -2762,8 +2763,38 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)

  this_hdr = &esd->this_hdr;

+  /* For linking, compress DWARF debug sections with names: .debug_*.  */
+  if (arg->link_info
+      && (arg->link_info->compress_debug & COMPRESS_DEBUG)
+      && (asect->flags & SEC_DEBUGGING)
+      && name[1] == 'd'
+      && name[6] == '_')
+    {
+      /* Set SEC_ELF_COMPRESS to indicate this section should be
+	 compressed.  */
+      asect->flags |= SEC_ELF_COMPRESS;
+
+      if (arg->link_info->compress_debug != COMPRESS_DEBUG_GABI_ZLIB)
+	{
+	  /* If SHF_COMPRESSED isn't used, rename compressed DWARF
+	     debug section to .zdebug_*.  */
+	  unsigned int len = strlen (name);
+	  char *new_name = bfd_alloc (abfd, len + 2);
+	  if (new_name == NULL)
+	    {
+	      arg->failed = TRUE;
+	      return;
+	    }
+	  new_name[0] = '.';
+	  new_name[1] = 'z';
+	  memcpy (new_name + 2, name + 1, len);
+	  bfd_rename_section (abfd, asect, new_name);
+	  name = asect->name;
+	}
+    }
+
  this_hdr->sh_name = (unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd),
-							  asect->name, FALSE);
+							  name, FALSE);
  if (this_hdr->sh_name == (unsigned int) -1)
    {
      arg->failed = TRUE;
@ -5116,6 +5147,9 @@ assign_file_positions_for_non_load_sections (bfd *abfd,
 	}
      else if (((hdr->sh_type == SHT_REL || hdr->sh_type == SHT_RELA)
 		&& hdr->bfd_section == NULL)
+	       || (hdr->bfd_section != NULL
+		   && (hdr->bfd_section->flags & SEC_ELF_COMPRESS))
+		   /* Compress DWARF debug sections.  */
 	       || hdr == i_shdrpp[elf_onesymtab (abfd)]
 	       || hdr == i_shdrpp[elf_symtab_shndx (abfd)]
 	       || hdr == i_shdrpp[elf_strtab_sec (abfd)])
@ -5365,6 +5399,9 @@ assign_file_positions_except_relocs (bfd *abfd,
 	  hdr = *hdrpp;
 	  if (((hdr->sh_type == SHT_REL || hdr->sh_type == SHT_RELA)
 	       && hdr->bfd_section == NULL)
+	      || (hdr->bfd_section != NULL
+		  && (hdr->bfd_section->flags & SEC_ELF_COMPRESS))
+		  /* Compress DWARF debug sections.  */
 	      || i == elf_onesymtab (abfd)
 	      || i == elf_symtab_shndx (abfd)
 	      || i == elf_strtab_sec (abfd))
@ -5518,8 +5555,8 @@ prep_headers (bfd *abfd)
 /* Assign file positions for all the reloc sections which are not part
   of the loadable file image, and the file position of section headers.  */

-static void
-_bfd_elf_assign_file_positions_for_relocs (bfd *abfd)
+static bfd_boolean
+_bfd_elf_assign_file_positions_for_non_load (bfd *abfd)
 {
  file_ptr off;
  unsigned int i, num_sec;
@ -5535,9 +5572,30 @@ _bfd_elf_assign_file_positions_for_relocs (bfd *abfd)
      Elf_Internal_Shdr *shdrp;

      shdrp = *shdrpp;
-      if ((shdrp->sh_type == SHT_REL || shdrp->sh_type == SHT_RELA)
-	  && shdrp->sh_offset == -1)
-	off = _bfd_elf_assign_file_position_for_section (shdrp, off, TRUE);
+      if (shdrp->sh_offset == -1)
+	{
+	  bfd_boolean is_rel = (shdrp->sh_type == SHT_REL
+				|| shdrp->sh_type == SHT_RELA);
+	  if (is_rel
+	      || (shdrp->bfd_section != NULL
+		  && (shdrp->bfd_section->flags & SEC_ELF_COMPRESS)))
+	    {
+	      if (!is_rel)
+		{
+		  /* Compress DWARF debug sections.  */
+		  if (!bfd_compress_section (abfd, shdrp->bfd_section,
+					     shdrp->contents))
+		    return FALSE;
+		  /* Update section size and contents.  */
+		  shdrp->sh_size = shdrp->bfd_section->size;
+		  shdrp->contents = shdrp->bfd_section->contents;
+		  shdrp->bfd_section->contents = NULL;
+		}
+	      off = _bfd_elf_assign_file_position_for_section (shdrp,
+							       off,
+							       TRUE);
+	    }
+	}
    }

 /* Place the section headers.  */
@ -5547,6 +5605,8 @@ _bfd_elf_assign_file_positions_for_relocs (bfd *abfd)
  i_ehdrp->e_shoff = off;
  off += i_ehdrp->e_shnum * i_ehdrp->e_shentsize;
  elf_next_file_pos (abfd) = off;
+
+  return TRUE;
 }

 bfd_boolean
@ -5569,7 +5629,8 @@ _bfd_elf_write_object_contents (bfd *abfd)
  if (failed)
    return FALSE;

-  _bfd_elf_assign_file_positions_for_relocs (abfd);
+  if (!_bfd_elf_assign_file_positions_for_non_load (abfd))
+    return FALSE;

  /* After writing the headers, we need to write the sections too...  */
  num_sec = elf_numsections (abfd);
@ -7922,7 +7983,21 @@ _bfd_elf_set_section_contents (bfd *abfd,
      && ! _bfd_elf_compute_section_file_positions (abfd, NULL))
    return FALSE;

+  if (!count)
+    return TRUE;
+
  hdr = &elf_section_data (section)->this_hdr;
+  if (hdr->sh_offset == (file_ptr) -1)
+    {
+      /* We must compress this section.  Write output to the buffer.  */
+      unsigned char *contents = hdr->contents;
+      if ((offset + count) > hdr->sh_size
+	  || (section->flags & SEC_ELF_COMPRESS) == 0
+	  || contents == NULL)
+	abort ();
+      memcpy (contents + offset, location, count);
+      return TRUE;
+    }
  pos = hdr->sh_offset + offset;
  if (bfd_seek (abfd, pos, SEEK_SET) != 0
      || bfd_bwrite (location, count, abfd) != count)
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@ -10890,6 +10890,21 @@ bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
 	 to count upwards while actually outputting the relocations.  */
      esdo->rel.count = 0;
      esdo->rela.count = 0;
+
+      if (esdo->this_hdr.sh_offset == (file_ptr) -1)
+	{
+	  /* Cache the section contents so that they can be compressed
+	     later.  Use bfd_malloc since it will be freed by
+	     bfd_compress_section_contents.  */
+	  unsigned char *contents = esdo->this_hdr.contents;
+	  if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
+	    abort ();
+	  contents
+	    = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
+	  if (contents == NULL)
+	    goto error_return;
+	  esdo->this_hdr.contents = contents;
+	}
    }

  /* We have now assigned file positions for all the sections except
--- a/bfd/merge.c
+++ b/bfd/merge.c
@ -25,6 +25,7 @@

 #include "sysdep.h"
 #include "bfd.h"
+#include "elf-bfd.h"
 #include "libbfd.h"
 #include "hashtab.h"
 #include "libiberty.h"
@ -283,7 +284,8 @@ 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;
@ -306,7 +308,12 @@ 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)
+	  if (contents)
+	    {
+	      memcpy (contents + offset, pad, len);
+	      offset += len;
+	    }
+	  else if (bfd_bwrite (pad, len, abfd) != len)
 	    goto err;
 	  off += len;
 	}
@ -314,7 +321,12 @@ 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;
@ -322,9 +334,13 @@ 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)
+    {
+      if (contents)
+	memcpy (contents + offset, pad, off);
+      else if (bfd_bwrite (pad, off, abfd) != off)
+	goto err;
+    }

  if (pad != NULL)
    free (pad);
@ -785,6 +801,8 @@ _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 +813,26 @@ _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;
--- a/bfd/section.c
+++ b/bfd/section.c
@ -334,6 +334,10 @@ CODE_FRAGMENT
 .     executables or shared objects. This is for COFF only.  *}
 .#define SEC_COFF_SHARED 0x8000000
 .
+.  {* This section should be compressed.  This is for ELF linker
+.     internal use only.  *}
+.#define SEC_ELF_COMPRESS 0x8000000
+.
 .  {* When a section with this flag is being linked, then if the size of
 .     the input section is less than a page, it should not cross a page
 .     boundary.  If the size of the input section is one page or more,
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@ -1,3 +1,7 @@
+2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* as.h (compressed_debug_section_type): Removed.
+
 2015-04-14  Nick Clifton  <nickc@redhat.com>

 	* config/tc-rl78.h (TC_LINKRELAX_FIXUP): Define.
--- a/gas/as.h
+++ b/gas/as.h
@ -370,16 +370,6 @@ COMMON int flag_strip_local_absolute;
 /* True if we should generate a traditional format object file.  */
 COMMON int flag_traditional_format;

-/* Types of compressed debug sections.  We currently support zlib.  */
-enum compressed_debug_section_type
-{
-  COMPRESS_DEBUG_NONE = 0,
-  COMPRESS_DEBUG,
-  COMPRESS_DEBUG_ZLIB,
-  COMPRESS_DEBUG_GNU_ZLIB,
-  COMPRESS_DEBUG_GABI_ZLIB
-};
-
 /* Type of compressed debug sections we should generate.   */
 COMMON enum compressed_debug_section_type flag_compress_debug;

--- a/include/ChangeLog
+++ b/include/ChangeLog
@ -1,3 +1,7 @@
+2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* bfdlink.h (bfd_link_info): Add compress_debug.
+
 2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>

 	PR ld/pr17709
--- a/include/bfdlink.h
+++ b/include/bfdlink.h
@ -431,6 +431,9 @@ struct bfd_link_info
  /* Separator between archive and filename in linker script filespecs.  */
  char path_separator;

+  /* Compress DWARF debug sections.  */
+  enum compressed_debug_section_type compress_debug;
+
  /* Default stack size.  Zero means default (often zero itself), -1
     means explicitly zero-sized.  */
  bfd_signed_vma stacksize;
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@ -1,3 +1,16 @@
+2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* ld.texinfo: Document --compress-debug-sections=.
+	* ldmain.c (main): Set BFD_COMPRESS on output_bfd if
+	COMPRESS_DEBUG is set.  Set BFD_COMPRESS_GABI on output_bfd
+	for COMPRESS_DEBUG_GABI_ZLIB.
+	* lexsup.c (elf_static_list_options): Add
+	--compress-debug-sections=.
+	* emultempl/elf32.em (OPTION_COMPRESS_DEBUG): New.
+	(xtra_long): Add "compress-debug-sections".
+	(gld${EMULATION_NAME}_handle_option): Handle
+	OPTION_COMPRESS_DEBUG.
+
 2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>

 	PR ld/pr17709
--- a/ld/emultempl/elf32.em
+++ b/ld/emultempl/elf32.em
@ -2110,6 +2110,7 @@ fragment <<EOF
 #define OPTION_HASH_STYLE		(OPTION_EXCLUDE_LIBS + 1)
 #define OPTION_BUILD_ID			(OPTION_HASH_STYLE + 1)
 #define OPTION_AUDIT			(OPTION_BUILD_ID + 1)
+#define OPTION_COMPRESS_DEBUG		(OPTION_AUDIT + 1)

 static void
 gld${EMULATION_NAME}_add_options
@ -2137,6 +2138,7 @@ EOF
 fi
 fragment <<EOF
    {"build-id", optional_argument, NULL, OPTION_BUILD_ID},
+    {"compress-debug-sections", required_argument, NULL, OPTION_COMPRESS_DEBUG},
 EOF
 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
 fragment <<EOF
@ -2186,6 +2188,19 @@ gld${EMULATION_NAME}_handle_option (int optc)
 	emit_note_gnu_build_id = xstrdup (optarg);
      break;

+    case OPTION_COMPRESS_DEBUG:
+      if (strcasecmp (optarg, "none") == 0)
+	link_info.compress_debug = COMPRESS_DEBUG_NONE;
+      else if (strcasecmp (optarg, "zlib") == 0)
+	link_info.compress_debug = COMPRESS_DEBUG_ZLIB;
+      else if (strcasecmp (optarg, "zlib-gnu") == 0)
+	link_info.compress_debug = COMPRESS_DEBUG_GNU_ZLIB;
+      else if (strcasecmp (optarg, "zlib-gabi") == 0)
+	link_info.compress_debug = COMPRESS_DEBUG_GABI_ZLIB;
+      else
+	einfo (_("%P%F: invalid --compress-debug-sections option: \`%s'\n"),
+	       optarg);
+      break;
 EOF

 if test x"$GENERATE_SHLIB_SCRIPT" = xyes; then
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@ -2201,6 +2201,22 @@ new style GNU @code{.gnu.hash} section or @code{both} for both
 the classic ELF @code{.hash} and new style GNU @code{.gnu.hash}
 hash tables.  The default is @code{sysv}.

+@kindex --compress-debug-sections=none
+@kindex --compress-debug-sections=zlib
+@kindex --compress-debug-sections=zlib-gnu
+@kindex --compress-debug-sections=zlib-gabi
+@item --compress-debug-sections=none
+@itemx --compress-debug-sections=zlib
+@itemx --compress-debug-sections=zlib-gnu
+@itemx --compress-debug-sections=zlib-gabi
+On ELF platforms , these options control how DWARF debug sections are
+compressed using zlib.  @option{--compress-debug-sections=none} doesn't
+compress DWARF debug sections.  @option{--compress-debug-sections=zlib}
+and @option{--compress-debug-sections=zlib-gnu} compress DWARF debug
+sections and rename debug section names to begin with @samp{.zdebug}
+instead of @samp{.debug}.  @option{--compress-debug-sections=zlib-gabi}
+compresses DWARF debug sections with SHF_COMPRESSED from the ELF ABI.
+
@kindex --reduce-memory-overheads
@item --reduce-memory-overheads
 This option reduces memory requirements at ld runtime, at the expense of
--- a/ld/ldmain.c
+++ b/ld/ldmain.c
@ -425,6 +425,13 @@ main (int argc, char **argv)
  else
    link_info.output_bfd->flags |= EXEC_P;

+  if ((link_info.compress_debug & COMPRESS_DEBUG))
+    {
+      link_info.output_bfd->flags |= BFD_COMPRESS;
+      if (link_info.compress_debug == COMPRESS_DEBUG_GABI_ZLIB)
+	link_info.output_bfd->flags |= BFD_COMPRESS_GABI;
+    }
+
  ldwrite ();

  if (config.map_file != NULL)
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@ -1722,6 +1722,9 @@ elf_static_list_options (FILE *file)
  fprintf (file, _("\
  --build-id[=STYLE]          Generate build ID note\n"));
  fprintf (file, _("\
+  --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi]\n\
+                              Compress DWARF debug sections using zlib\n"));
+  fprintf (file, _("\
  -z common-page-size=SIZE    Set common page size to SIZE\n"));
  fprintf (file, _("\
  -z max-page-size=SIZE       Set maximum page size to SIZE\n"));
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@ -1,3 +1,16 @@
+2015-04-14  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* ld-elf/compress.exp (build_tests): Add tests for
+	--compress-debug-sections=.
+	(run_tests): Likewise.
+	Add additonal tests for --compress-debug-sections=.
+	* ld-elf/gabiend.rt: New file.
+	* ld-elf/gabinormal.rt: Likewise.
+	* ld-elf/gnubegin.rS: Likewise.
+	* ld-elf/gnunormal.rS: Likewise.
+	* ld-elf/zlibbegin.rS: Likewise.
+	* ld-elf/zlibnormal.rS: Likewise.
+
 2015-04-15  Alan Modra  <amodra@gmail.com>

 	* ld-gc/pr18223.d: xfail tic6x.
--- a/ld/testsuite/ld-elf/compress.exp
+++ b/ld/testsuite/ld-elf/compress.exp
@ -49,7 +49,8 @@ set build_tests {
   "-shared" "-fPIC -g -Wa,--compress-debug-sections"
   {foo.c} {} "libfoo.so"}
  {"Build libbar.so with compressed debug sections"
-   "-shared" "-fPIC -g -Wa,--compress-debug-sections"
+   "-shared -Wl,--compress-debug-sections=none"
+   "-fPIC -g -Wa,--compress-debug-sections"
   {begin.c end.c} {} "libbar.so"}
  {"Build libfoozlib.so with compressed debug sections with zlib-gabi"
   "-shared" "-fPIC -g -Wa,--compress-debug-sections=zlib-gabi"
@ -57,6 +58,30 @@ set build_tests {
  {"Build libbarzlib.so with compressed debug sections with zlib-gabi"
   "-shared" "-fPIC -g -Wa,--compress-debug-sections=zlib-gabi"
   {begin.c end.c} {} "libbarzlib.so"}
+  {"Build libzlibfoo.so with zlib compressed debug sections"
+   "-shared -Wl,--compress-debug-sections=zlib"
+   "-fPIC -g -Wa,--compress-debug-sections=zlib"
+   {foo.c} {} "libzlibfoo.so"}
+  {"Build libgnufoo.so with zlib-gnu compressed debug sections"
+   "-shared -Wl,--compress-debug-sections=zlib-gnu"
+   "-fPIC -g -Wa,--compress-debug-sections=zlib-gnu"
+   {foo.c} {} "libgnufoo.so"}
+  {"Build libgabifoo.so with zlib-gabi compressed debug sections"
+   "-shared -Wl,--compress-debug-sections=zlib-gabi"
+   "-fPIC -g -Wa,--compress-debug-sections=zlib-gabi"
+   {foo.c} {} "libgabifoo.so"}
+  {"Build zlibbegin.o with zlib compressed debug sections"
+   "-r -nostdlib -Wl,--compress-debug-sections=zlib"
+   "-g -Wa,--compress-debug-sections=zlib"
+   {begin.c} {} "zlibbegin.o"}
+  {"Build gnubegin.o with zlib-gnu compressed debug sections"
+   "-r -nostdlib -Wl,--compress-debug-sections=zlib-gnu"
+   "-g -Wa,--compress-debug-sections=zlib-gnu"
+   {begin.c} {} "gnubegin.o"}
+  {"Build gabiend.o with zlib-gabi compressed debug sections"
+   "-r -nostdlib -Wl,--compress-debug-sections=zlib-gabi"
+   "-g -Wa,--compress-debug-sections=zlib-gnu"
+   {end.c} {} "gabiend.o"}
 }

 set run_tests {
@ -66,6 +91,15 @@ set run_tests {
    {"Run normal with libfoo.so with compressed debug sections with zlib-gabi"
     "tmpdir/begin.o tmpdir/libfoozlib.so tmpdir/end.o" ""
     {main.c} "normal" "normal.out" "-Wa,--compress-debug-sections=zlib-gabi"}
+    {"Run zlibnormal with libzlibfoo.so with zlib compressed debug sections"
+     "tmpdir/begin.o tmpdir/libzlibfoo.so tmpdir/end.o --compress-debug-sections=zlib" ""
+     {main.c} "zlibnormal" "normal.out" "-Wa,--compress-debug-sections=zlib"}
+    {"Run gnunormal with libgnufoo.so with zlib-gnu compressed debug sections"
+     "tmpdir/gnubegin.o tmpdir/libgnufoo.so tmpdir/end.o --compress-debug-sections=zlib-gnu" ""
+     {main.c} "gnunormal" "normal.out" "-Wa,--compress-debug-sections=zlib-gnu"}
+    {"Run gabinormal with libgabifoo.so with zlib-gabi compressed debug sections"
+     "tmpdir/zlibbegin.o tmpdir/libgabifoo.so tmpdir/gabiend.o --compress-debug-sections=zlib-gabi" ""
+     {main.c} "gabinormal" "normal.out" "-Wa,--compress-debug-sections=zlib-gabi"}
 }

 run_cc_link_tests $build_tests
@ -79,3 +113,134 @@ if { [catch {exec cmp tmpdir/libfoo.so tmpdir/libfoozlib.so}] } then {
 } else {
    pass "$test_name"
 }
+
+global READELF
+
+set test_name "Link -r with zlib compressed debug output"
+set test zlibbegin
+send_log "$READELF -S -W tmpdir/$test.o > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -S -W tmpdir/$test.o" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rS] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+
+set test_name "Link -r with zlib-gnu compressed debug output"
+set test gnubegin
+send_log "$READELF -S -W tmpdir/$test.o > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -S -W tmpdir/$test.o" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rS] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+
+set test_name "Link -r with zlib-gabi compressed debug output"
+set test gabiend
+send_log "$READELF -t -W tmpdir/$test.o > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -t -W tmpdir/$test.o" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rt] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+
+set test_name "Link with zlib compressed debug output"
+set test normal
+send_log "$READELF -w tmpdir/$test > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -w tmpdir/$test" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+
+set test_name "Link with zlib compressed debug output"
+set test zlibnormal
+send_log "$READELF -w tmpdir/$test | sed -e \"s/.zdebug_/.debug_/\" > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -w tmpdir/$test | sed -e \"s/.zdebug_/.debug_/\"" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [catch {exec cmp tmpdir/normal.out tmpdir/$test.out}] } then {
+    send_log "tmpdir/normal.out tmpdir/$test.out differ.\n"
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+send_log "$READELF -S -W tmpdir/$test' > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -S -W tmpdir/$test" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rS] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+
+set test_name "Link with zlib-gnu compressed debug output"
+set test gnunormal
+send_log "$READELF -w tmpdir/$test | sed -e \"s/.zdebug_/.debug_/\" > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -w tmpdir/$test | sed -e \"s/.zdebug_/.debug_/\"" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [catch {exec cmp tmpdir/normal.out tmpdir/$test.out}] } then {
+    send_log "tmpdir/normal.out tmpdir/$test.out differ.\n"
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+send_log "$READELF -S -W tmpdir/$test' > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -S -W tmpdir/$test" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rS] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+
+set test gabinormal
+set test_name "Link with zlib-gabi compressed debug output"
+send_log "$READELF -w tmpdir/$test > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -w tmpdir/$test" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [catch {exec cmp tmpdir/normal.out tmpdir/$test.out}] } then {
+    send_log "tmpdir/normal.out tmpdir/$test.out differ.\n"
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
+send_log "$READELF -t -W tmpdir/$test > tmpdir/$test.out\n"
+set got [remote_exec host "$READELF -t -W tmpdir/$test" "" "/dev/null" "tmpdir/$test.out"]
+if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+    send_log "$got\n"
+    unresolved "$test_name"
+}
+if { [regexp_diff tmpdir/$test.out $srcdir/$subdir/$test.rt] } then {
+    fail "$test_name"
+} else {
+    pass "$test_name"
+}
--- a/ld/testsuite/ld-elf/gabiend.rt
+++ b/ld/testsuite/ld-elf/gabiend.rt
@ -0,0 +1,4 @@
+#...
+ +\[[0-9a-f]+\]: .*COMPRESSED
+ +ZLIB, [0-9a-f]+, 1
+#pass
--- a/ld/testsuite/ld-elf/gabinormal.rt
+++ b/ld/testsuite/ld-elf/gabinormal.rt
@ -0,0 +1,4 @@
+#...
+ +\[[0-9a-f]+\]: .*COMPRESSED
+ +ZLIB, [0-9a-f]+, 1
+#pass
--- a/ld/testsuite/ld-elf/gnubegin.rS
+++ b/ld/testsuite/ld-elf/gnubegin.rS
@ -0,0 +1,3 @@
+#...
+ +\[[ 0-9]+\] .zdebug_.* +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +0 +0 +1
+#pass
--- a/ld/testsuite/ld-elf/gnunormal.rS
+++ b/ld/testsuite/ld-elf/gnunormal.rS
@ -0,0 +1,3 @@
+#...
+ +\[[ 0-9]+\] .zdebug_.* +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +0 +0 +1
+#pass
--- a/ld/testsuite/ld-elf/zlibbegin.rS
+++ b/ld/testsuite/ld-elf/zlibbegin.rS
@ -0,0 +1,3 @@
+#...
+ +\[[ 0-9]+\] .zdebug_.* +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +0 +0 +1
+#pass
--- a/ld/testsuite/ld-elf/zlibnormal.rS
+++ b/ld/testsuite/ld-elf/zlibnormal.rS
@ -0,0 +1,3 @@
+#...
+ +\[[ 0-9]+\] .zdebug_.* +(PROGBITS|MIPS_DWARF) +0+ +[0-9a-f]+ +[0-9a-f]+ [0-9a-f]+ +0 +0 +1
+#pass