PowerPC64, don't relocate nops

Alan Modra amodra@gmail.com
Fri Feb 2 12:15:00 GMT 2018


This fixes a "bug" in that nops emitted as part of code optimization
were being relocated.  As it happens the relocation value was always
zero so the nop wasn't changed.  Whew!  I've also moved the use of
"howto" later since I was caught out in some recent code changes with
the howto not matching r_type.

	* elf64-ppc.c (ppc64_elf_relocate_section): Don't relocate nops
	emitted for toc sequence optimization.  Set and use "howto" later.

diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 9e4a4b5..d6ec12f 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -15067,7 +15067,6 @@ ppc64_elf_relocate_section (bfd *output_bfd,
       /* Multi-instruction sequences that access the TOC can be
 	 optimized, eg. addis ra,r2,0; addi rb,ra,x;
 	 to		nop;	       addi rb,r2,x;  */
-      howto = ppc64_elf_howto_table[(int) r_type];
       switch (r_type)
 	{
 	default:
@@ -15099,6 +15098,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
 	    {
 	      bfd_byte *p = contents + (rel->r_offset & ~3);
 	      bfd_put_32 (input_bfd, NOP, p);
+	      goto copy_reloc;
 	    }
 	  break;
 
@@ -15140,9 +15140,13 @@ ppc64_elf_relocate_section (bfd *output_bfd,
 		/* xgettext:c-format */
 		info->callbacks->minfo
 		  (_("%H: warning: %s unexpected insn %#x.\n"),
-		   input_bfd, input_section, rel->r_offset, howto->name, insn);
+		   input_bfd, input_section, rel->r_offset,
+		   ppc64_elf_howto_table[r_type]->name, insn);
 	      else
-		bfd_put_32 (input_bfd, NOP, p);
+		{
+		  bfd_put_32 (input_bfd, NOP, p);
+		  goto copy_reloc;
+		}
 	    }
 	  break;
 
@@ -15240,7 +15244,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
 		/* xgettext:c-format */
 		(_("%H: error: %s not a multiple of %u\n"),
 		 input_bfd, input_section, rel->r_offset,
-		 howto->name,
+		 ppc64_elf_howto_table[r_type]->name,
 		 mask + 1);
 	      bfd_set_error (bfd_error_bad_value);
 	      ret = FALSE;
@@ -15252,6 +15256,7 @@ ppc64_elf_relocate_section (bfd *output_bfd,
       /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
 	 because such sections are not SEC_ALLOC and thus ld.so will
 	 not process them.  */
+      howto = ppc64_elf_howto_table[(int) r_type];
       if (unresolved_reloc
 	  && !((input_section->flags & SEC_DEBUGGING) != 0
 	       && h->elf.def_dynamic)

-- 
Alan Modra
Australia Development Lab, IBM



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