2011-11-09 Doug Kwan <dougkwan@google.com>

	PR gold/13362
	* arm.cc (Arm_scan_relocatable_relocs::Default_scan_relocatable_relocs):
	Use unaligned 4-byte relocs for static 32-bit data as required by EABI.
	* reloc.h (Relocatable_relocs::Reloc_strategy): New enum
	RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
	(Relocate_functions::rel_unaligned): New.
	(Relocate_functions::rel32_unaligned): New.
	* target-reloc.h (relocate_for_relocatable): Add code to handle
	RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
	* testsuite/Makefile.am (arm_unaligned_reloc_r.stdout,
	arm_unaligned_reloc_r): New targets.
	* testsuite/Makefile.in: Regenerate.
	* arm_unaligned_reloc.sh: Check unaligned relocs in relocatable
	linking.

7 files changed, 73 insertions, 4 deletions

diff --git a/gold/ChangeLog b/gold/ChangeLog
index aac3aa0..f3707ae 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,20 @@
+2011-11-09  Doug Kwan  <dougkwan@google.com>
+
+	PR gold/13362
+	* arm.cc (Arm_scan_relocatable_relocs::Default_scan_relocatable_relocs):
+	Use unaligned 4-byte relocs for static 32-bit data as required by EABI.
+	* reloc.h (Relocatable_relocs::Reloc_strategy): New enum
+	RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
+	(Relocate_functions::rel_unaligned): New.
+	(Relocate_functions::rel32_unaligned): New.
+	* target-reloc.h (relocate_for_relocatable): Add code to handle
+	RELOC_ADJUST_FOR_SECTION_4_UNALIGNED.
+	* testsuite/Makefile.am (arm_unaligned_reloc_r.stdout,
+	arm_unaligned_reloc_r): New targets.
+	* testsuite/Makefile.in: Regenerate.
+	* arm_unaligned_reloc.sh: Check unaligned relocs in relocatable
+	linking.
+
 2011-11-02  Ian Lance Taylor  <iant@google.com>
 
 	* configure.ac: Add --with-lib-path option.  Define LIB_PATH and
diff --git a/gold/arm.cc b/gold/arm.cc
index 200c371..a17469b 100644
--- a/gold/arm.cc
+++ b/gold/arm.cc
@@ -2075,7 +2075,8 @@ class Arm_scan_relocatable_relocs :
 	  case elfcpp::R_ARM_TARGET1:
 	  case elfcpp::R_ARM_TARGET2:
 	    gold_unreachable();
-	  // Relocations that write full 32 bits.
+	  // Relocations that write full 32 bits and
+          // have alignment of 1.
 	  case elfcpp::R_ARM_ABS32:
 	  case elfcpp::R_ARM_REL32:
 	  case elfcpp::R_ARM_SBREL32:
@@ -2093,7 +2094,7 @@ class Arm_scan_relocatable_relocs :
 	  case elfcpp::R_ARM_TLS_LDO32:
 	  case elfcpp::R_ARM_TLS_IE32:
 	  case elfcpp::R_ARM_TLS_LE32:
-	    return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4;
+	    return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED;
 	  default:
 	    // For all other static relocations, return RELOC_SPECIAL.
 	    return Relocatable_relocs::RELOC_SPECIAL;
diff --git a/gold/reloc.h b/gold/reloc.h
index 3a33c9b..fefcb3f 100644
--- a/gold/reloc.h
+++ b/gold/reloc.h
@@ -247,6 +247,8 @@ class Relocatable_relocs
     RELOC_ADJUST_FOR_SECTION_2,
     RELOC_ADJUST_FOR_SECTION_4,
     RELOC_ADJUST_FOR_SECTION_8,
+    // Like RELOC_ADJUST_FOR_SECTION_4 but for unaligned relocs.
+    RELOC_ADJUST_FOR_SECTION_4_UNALIGNED,
     // Discard the input reloc--process it completely when relocating
     // the data section contents.
     RELOC_DISCARD,
@@ -347,6 +349,20 @@ private:
     elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
   }
 
+  // Like the above but for relocs at unaligned addresses.
+  template<int valsize>
+  static inline void
+  rel_unaligned(unsigned char* view,
+                const Sized_relobj_file<size, big_endian>* object,
+                const Symbol_value<size>* psymval)
+  {
+    typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
+        Valtype;
+    Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view);
+    x = psymval->value(object, x);
+    elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x);
+  }
+
   // Do a simple relocation with the addend in the relocation.
   // VALSIZE is the size of the value.
   template<int valsize>
@@ -558,6 +574,13 @@ public:
 	const Symbol_value<size>* psymval)
   { This::template rel<32>(view, object, psymval); }
 
+  // Like above but for relocs at unaligned addresses.
+  static inline void
+  rel32_unaligned(unsigned char* view,
+	          const Sized_relobj_file<size, big_endian>* object,
+	          const Symbol_value<size>* psymval)
+  { This::template rel_unaligned<32>(view, object, psymval); }
+
   // Do an 32-bit RELA relocation with the addend in the relocation.
   static inline void
   rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
diff --git a/gold/target-reloc.h b/gold/target-reloc.h
index 832c5d6..464a3fa 100644
--- a/gold/target-reloc.h
+++ b/gold/target-reloc.h
@@ -669,6 +669,7 @@ relocate_for_relocatable(
 	    case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_2:
 	    case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4:
 	    case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_8:
+	    case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED:
 	      {
 		// We are adjusting a section symbol.  We need to find
 		// the symbol table index of the section symbol for
@@ -790,6 +791,12 @@ relocate_for_relocatable(
 							  psymval);
 	      break;
 
+	    case Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED:
+	      Relocate_functions<size, big_endian>::rel32_unaligned(padd,
+								    object,
+								    psymval);
+	      break;
+
 	    default:
 	      gold_unreachable();
 	    }
diff --git a/gold/testsuite/Makefile.am b/gold/testsuite/Makefile.am
index 47058e9..794dac8 100644
--- a/gold/testsuite/Makefile.am
+++ b/gold/testsuite/Makefile.am
@@ -2521,18 +2521,24 @@ pr12826_2.o: pr12826_2.s
 	$(TEST_AS) -o $@ $<
 
 check_SCRIPTS += arm_unaligned_reloc.sh
-check_DATA += arm_unaligned_reloc.stdout
+check_DATA += arm_unaligned_reloc.stdout arm_unaligned_reloc_r.stdout
 
 arm_unaligned_reloc.stdout: arm_unaligned_reloc
 	$(TEST_OBJDUMP) -D $< > $@
 
+arm_unaligned_reloc_r.stdout: arm_unaligned_reloc_r
+	$(TEST_OBJDUMP) -Dr $< > $@
+
 arm_unaligned_reloc: arm_unaligned_reloc.o ../ld-new
 	../ld-new -o $@ $<
 
+arm_unaligned_reloc_r: arm_unaligned_reloc.o ../ld-new
+	../ld-new -r -o $@ $<
+
 arm_unaligned_reloc.o: arm_unaligned_reloc.s
 	$(TEST_AS) -o $@ $<
 
-MOSTLYCLEANFILES += arm_unaligned_reloc
+MOSTLYCLEANFILES += arm_unaligned_reloc arm_unaligned_reloc_r
 
 # Check ARM to ARM farcall veneers
 
diff --git a/gold/testsuite/Makefile.in b/gold/testsuite/Makefile.in
index f66fb8a..af62c8d 100644
--- a/gold/testsuite/Makefile.in
+++ b/gold/testsuite/Makefile.in
@@ -568,6 +568,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_exidx_test.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	pr12826.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_unaligned_reloc.stdout \
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_unaligned_reloc_r.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_arm.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_thumb.stdout \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_thumb_5t.stdout \
@@ -610,6 +611,7 @@ check_PROGRAMS = $(am__EXEEXT_1) $(am__EXEEXT_2) $(am__EXEEXT_3) \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_cortex_a8_local \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_cortex_a8_local_reloc \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_unaligned_reloc \
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_unaligned_reloc_r \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_arm \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_thumb \
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	arm_farcall_arm_thumb_5t \
@@ -5474,9 +5476,15 @@ uninstall-am:
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@arm_unaligned_reloc.stdout: arm_unaligned_reloc
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	$(TEST_OBJDUMP) -D $< > $@
 
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@arm_unaligned_reloc_r.stdout: arm_unaligned_reloc_r
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	$(TEST_OBJDUMP) -Dr $< > $@
+
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@arm_unaligned_reloc: arm_unaligned_reloc.o ../ld-new
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	../ld-new -o $@ $<
 
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@arm_unaligned_reloc_r: arm_unaligned_reloc.o ../ld-new
+@DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	../ld-new -r -o $@ $<
+
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@arm_unaligned_reloc.o: arm_unaligned_reloc.s
 @DEFAULT_TARGET_ARM_TRUE@@NATIVE_OR_CROSS_LINKER_TRUE@	$(TEST_AS) -o $@ $<
 
diff --git a/gold/testsuite/arm_unaligned_reloc.sh b/gold/testsuite/arm_unaligned_reloc.sh
index 496ee28..39a5a11 100755
--- a/gold/testsuite/arm_unaligned_reloc.sh
+++ b/gold/testsuite/arm_unaligned_reloc.sh
@@ -47,4 +47,11 @@ check arm_unaligned_reloc.stdout "^    a005:	ffffeffb .*$"
 check arm_unaligned_reloc.stdout "^0000a009 <abs16>:"
 check arm_unaligned_reloc.stdout "^    a009:	00009000 .*$"
 
+check arm_unaligned_reloc_r.stdout "^   1:	00000000 .*$"
+check arm_unaligned_reloc_r.stdout "^[	]*1: R_ARM_ABS32	.data.0$"
+check arm_unaligned_reloc_r.stdout "^   5:	00000000 .*$"
+check arm_unaligned_reloc_r.stdout "^[	]*5: R_ARM_REL32	.data.0$"
+check arm_unaligned_reloc_r.stdout "^   9:	00000000 .*$"
+check arm_unaligned_reloc_r.stdout "^[	]*9: R_ARM_ABS16	.data.0$"
+
 exit 0