From: Jakub Jelinek <jakub@redhat.com>
Date: Wed, 19 Dec 2001 11:48:15 +0000 (+0000)
Subject: 	* elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): If new_size
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a5eb27e6ff61757fc74229dce1f8864262a51fbe;p=deliverable%2Fbinutils-gdb.git

	* elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): If new_size
	is 0, temporarily grow it to minimal CIE size.
	(_bfd_elf_write_section_eh_frame): If input .eh_frame section would
	end up empty, build a fake minimal CIE.
---

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 77d3d81e3c..619f42c52c 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2001-12-19  Jakub Jelinek  <jakub@redhat.com>
+
+	* elf-eh-frame.c (_bfd_elf_discard_section_eh_frame): If new_size
+	is 0, temporarily grow it to minimal CIE size.
+	(_bfd_elf_write_section_eh_frame): If input .eh_frame section would
+	end up empty, build a fake minimal CIE.
+
 2001-12-19  Steve Ellcey  <sje@cup.hp.com>
 
 	* config.bfd (bfd_elf32_ia64_hpux_big_vec): New vector for
diff --git a/bfd/elf-eh-frame.c b/bfd/elf-eh-frame.c
index 2436c17e37..d39e549369 100644
--- a/bfd/elf-eh-frame.c
+++ b/bfd/elf-eh-frame.c
@@ -701,8 +701,12 @@ _bfd_elf_discard_section_eh_frame (abfd, info, sec, ehdrsec,
       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;
@@ -1069,6 +1073,18 @@ _bfd_elf_write_section_eh_frame (abfd, sec, ehdrsec, contents)
       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,