Don't change compressed input debug section names

Change compressed input debug section name for objdump is very confusing.
But we need to change it for linker so that linker will consider the
input section as a debug section.  This patch delays section rename to
elf_fake_sections for objcopy and avoids it for objdump.

bfd/

	PR binutils/18209
	* bfd.c (bfd): Add is_linker_input.
	* elf.c (convert_debug_to_zdebug): New.
	(convert_zdebug_to_debug): Likewise.
	(_bfd_elf_make_section_from_shdr): Don't convert .debug_* to
	.zdebug_* here.  Use convert_zdebug_to_debug.  Set SEC_ELF_RENAME.
	(_bfd_elf_init_reloc_shdr): Pass a pointer to section name
	instead of a pointer to section.
	(elf_fake_sections): Rename the section name if SEC_ELF_RENAME
	is set.
	* section.c (SEC_ELF_RENAME): New.
	* bfd-in2.h: Regenerated.

binutils/

	PR binutils/18209
	* objcopy.c (setup_section): Copy compress status.

binutils/testsuite/

	PR binutils/18209
	* binutils-all/compress.exp: Replace dw2-3.W with dw2-3gabi.W
	on zlib-gabi output.
	* binutils-all/dw2-1.W: Convert section names to .zdebug_*.
	* binutils-all/dw2-3.W: Likewise.
	* binutils-all/objdump.W: Likewise.
	* binutils-all/dw2-3gabi.W: New file.

ld/

	PR binutils/18209
	* ldfile.c (ldfile_try_open_bfd): Set is_linker_input to 1.

1 files changed, 97 insertions, 56 deletions

diff --git a/bfd/elf.c b/bfd/elf.c
index c60e1c8..d67c22b 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -855,6 +855,31 @@ bfd_elf_is_group_section (bfd *abfd ATTRIBUTE_UNUSED, const asection *sec)
   return elf_next_in_group (sec) != NULL;
 }
 
+static char *
+convert_debug_to_zdebug (bfd *abfd, const char *name)
+{
+  unsigned int len = strlen (name);
+  char *new_name = bfd_alloc (abfd, len + 2);
+  if (new_name == NULL)
+    return NULL;
+  new_name[0] = '.';
+  new_name[1] = 'z';
+  memcpy (new_name + 2, name + 1, len);
+  return new_name;
+}
+
+static char *
+convert_zdebug_to_debug (bfd *abfd, const char *name)
+{
+  unsigned int len = strlen (name);
+  char *new_name = bfd_alloc (abfd, len);
+  if (new_name == NULL)
+    return NULL;
+  new_name[0] = '.';
+  memcpy (new_name + 1, name + 2, len - 1);
+  return new_name;
+}
+
 /* Make a BFD section from an ELF section.  We store a pointer to the
    BFD section in the bfd_section field of the header.  */
 
@@ -1041,7 +1066,6 @@ _bfd_elf_make_section_from_shdr (bfd *abfd,
 	  || (name[1] == 'z' && name[7] == '_')))
     {
       enum { nothing, compress, decompress } action = nothing;
-      char *new_name;
       int compression_header_size;
       bfd_boolean compressed
 	= bfd_is_section_compressed_with_header (abfd, newsect,
@@ -1090,42 +1114,26 @@ _bfd_elf_make_section_from_shdr (bfd *abfd,
 	    }
 	}
 
-      new_name = NULL;
-      if (action == decompress
-	   || (action == compress
-	       && (abfd->flags & BFD_COMPRESS_GABI) != 0))
+      if (abfd->is_linker_input)
 	{
-	  if (name[1] == 'z')
+	  if (name[1] == 'z'
+	      && (action == decompress
+		  || (action == compress
+		      && (abfd->flags & BFD_COMPRESS_GABI) != 0)))
 	    {
-	      unsigned int len = strlen (name);
-
-	      new_name = bfd_alloc (abfd, len);
-	      if (new_name == NULL)
-		return FALSE;
-	      new_name[0] = '.';
-	      memcpy (new_name + 1, name + 2, len - 1);
-	    }
-	}
-      else if (action == compress
-	       && newsect->compress_status == COMPRESS_SECTION_DONE)
-	{
-	  /* PR binutils/18087: Compression does not always make a section
-	     smaller.  So only rename the section when compression has
-	     actually taken place.  */
-	  if (name[1] != 'z')
-	    {
-	      unsigned int len = strlen (name);
-
-	      new_name = bfd_alloc (abfd, len + 2);
+	      /* Convert section name from .zdebug_* to .debug_* so
+		 that linker will consider this section as a debug
+		 section.  */
+	      char *new_name = convert_zdebug_to_debug (abfd, name);
 	      if (new_name == NULL)
 		return FALSE;
-	      new_name[0] = '.';
-	      new_name[1] = 'z';
-	      memcpy (new_name + 2, name + 1, len);
+	      bfd_rename_section (abfd, newsect, new_name);
 	    }
 	}
-      if (new_name != NULL)
-	bfd_rename_section (abfd, newsect, new_name);
+      else
+	/* For objdump, don't rename the section.  For objcopy, delay
+	   section rename to elf_fake_sections.  */
+	newsect->flags |= SEC_ELF_RENAME;
     }
 
   return TRUE;
@@ -2689,7 +2697,7 @@ _bfd_elf_single_rel_hdr (asection *sec)
 static bfd_boolean
 _bfd_elf_init_reloc_shdr (bfd *abfd,
 			  struct bfd_elf_section_reloc_data *reldata,
-			  asection *asect,
+			  const char *sec_name,
 			  bfd_boolean use_rela_p)
 {
   Elf_Internal_Shdr *rel_hdr;
@@ -2702,11 +2710,11 @@ _bfd_elf_init_reloc_shdr (bfd *abfd,
   rel_hdr = bfd_zalloc (abfd, amt);
   reldata->hdr = rel_hdr;
 
-  amt = sizeof ".rela" + strlen (asect->name);
+  amt = sizeof ".rela" + strlen (sec_name);
   name = (char *) bfd_alloc (abfd, amt);
   if (name == NULL)
     return FALSE;
-  sprintf (name, "%s%s", use_rela_p ? ".rela" : ".rel", asect->name);
+  sprintf (name, "%s%s", use_rela_p ? ".rela" : ".rel", sec_name);
   rel_hdr->sh_name =
     (unsigned int) _bfd_elf_strtab_add (elf_shstrtab (abfd), name,
 					FALSE);
@@ -2763,33 +2771,66 @@ 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] == '_')
+  if (arg->link_info)
     {
-      /* Set SEC_ELF_COMPRESS to indicate this section should be
-	 compressed.  */
-      asect->flags |= SEC_ELF_COMPRESS;
+      /* ld: compress DWARF debug sections with names: .debug_*.  */
+      if ((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 (arg->link_info->compress_debug != COMPRESS_DEBUG_GABI_ZLIB)
+	    {
+	      /* If SHF_COMPRESSED isn't used, rename compressed DWARF
+		 debug section to .zdebug_*.  */
+	      char *new_name = convert_debug_to_zdebug (abfd, name);
+	      if (new_name == NULL)
+		{
+		  arg->failed = TRUE;
+		  return;
+		}
+	      bfd_rename_section (abfd, asect, new_name);
+	      name = asect->name;
+	    }
+	}
+    }
+  else if ((asect->flags & SEC_ELF_RENAME))
+    {
+      /* objcopy: rename output DWARF debug section.  */
+      if ((abfd->flags & (BFD_DECOMPRESS | BFD_COMPRESS_GABI)))
+	{
+	  /* When we decompress or compress with SHF_COMPRESSED,
+	     convert section name from .zdebug_* to .debug_* if
+	     needed.  */
+	  if (name[1] == 'z')
+	    {
+	      char *new_name = convert_zdebug_to_debug (abfd, name);
+	      if (new_name == NULL)
+		{
+		  arg->failed = TRUE;
+		  return;
+		}
+	      name = new_name;
+	    }
+	}
+      else if (asect->compress_status == COMPRESS_SECTION_DONE)
 	{
-	  /* 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);
+	  /* PR binutils/18087: Compression does not always make a
+	     section smaller.  So only rename the section when
+	     compression has actually taken place.  If input section
+	     name is .zdebug_*, we should never compress it again.  */
+	  char *new_name = convert_debug_to_zdebug (abfd, name);
 	  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;
+	  BFD_ASSERT (name[1] != 'z');
+	  name = new_name;
 	}
     }
 
@@ -2972,13 +3013,13 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
 	  && (arg->link_info->relocatable || arg->link_info->emitrelocations))
 	{
 	  if (esd->rel.count && esd->rel.hdr == NULL
-	      && !_bfd_elf_init_reloc_shdr (abfd, &esd->rel, asect, FALSE))
+	      && !_bfd_elf_init_reloc_shdr (abfd, &esd->rel, name, FALSE))
 	    {
 	      arg->failed = TRUE;
 	      return;
 	    }
 	  if (esd->rela.count && esd->rela.hdr == NULL
-	      && !_bfd_elf_init_reloc_shdr (abfd, &esd->rela, asect, TRUE))
+	      && !_bfd_elf_init_reloc_shdr (abfd, &esd->rela, name, TRUE))
 	    {
 	      arg->failed = TRUE;
 	      return;
@@ -2987,7 +3028,7 @@ elf_fake_sections (bfd *abfd, asection *asect, void *fsarg)
       else if (!_bfd_elf_init_reloc_shdr (abfd,
 					  (asect->use_rela_p
 					   ? &esd->rela : &esd->rel),
-					  asect,
+					  name,
 					  asect->use_rela_p))
 	  arg->failed = TRUE;
     }