[AArch64] Use SYMBOL_REFERENCES_LOCAL in one symbol check

For some pc-relative relocations we want to allow them under PIC mode while
a normal global symbol defined in the same dynamic object can still bind
externally through copy relocation.  So, we should not allow pc-relative
relocation against such symbol.

SYMBOL_REFERENCES_LOCAL should be used and is more accurate than the original
individual checks.

bfd/
	* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Use
	SYMBOL_REFERENCES_LOCAL.
ld/
	* testsuite/ld-aarch64/aarch64-elf.exp: Update test name
	* testsuite/ld-aarch64/pcrel.s: Add new testcases.
	* testsuite/ld-aarch64/pcrel_pic_undefined.d: Update the expected
	warnings.
	* testsuite/ld-aarch64/pcrel_pic_defined_local.d: Rename ...
	* testsuite/ld-aarch64/pcrel_pic_defined.d: ... to this.
	Update expected warnings.

8 files changed, 44 insertions, 18 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 879ced7..c7241ba 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2017-06-16  Jiong Wang  <jiong.wang@arm.com>
+
+	* elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Use
+	SYMBOL_REFERENCES_LOCAL.
+
 2017-06-15  Jiong Wang  <jiong.wang@arm.com>
 
 	PR ld/21532
diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index e27f067..b61bb8a 100644
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -5329,15 +5329,15 @@ elfNN_aarch64_final_link_relocate (reloc_howto_type *howto,
       if (bfd_link_pic (info)
 	  && (input_section->flags & SEC_ALLOC) != 0
 	  && (input_section->flags & SEC_READONLY) != 0
-	  && h != NULL
-	  && !h->def_regular)
+	  && !SYMBOL_REFERENCES_LOCAL (info, h))
 	{
 	  int howto_index = bfd_r_type - BFD_RELOC_AARCH64_RELOC_START;
 
 	  _bfd_error_handler
 	    /* xgettext:c-format */
-	    (_("%B: relocation %s against external symbol `%s' can not be used"
-	       " when making a shared object; recompile with -fPIC"),
+	    (_("%B: relocation %s against symbol `%s' which may bind "
+	       "externally can not be used when making a shared object; "
+	       "recompile with -fPIC"),
 	     input_bfd, elfNN_aarch64_howto_table[howto_index].name,
 	     h->root.root.string);
 	  bfd_set_error (bfd_error_bad_value);
diff --git a/ld/ChangeLog b/ld/ChangeLog
index 7791c03..751699d 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,13 @@
+2017-06-16  Jiong Wang  <jiong.wang@arm.com>
+
+	* testsuite/ld-aarch64/aarch64-elf.exp: Update test name
+	* testsuite/ld-aarch64/pcrel.s: Add new testcases.
+	* testsuite/ld-aarch64/pcrel_pic_undefined.d: Update the expected
+	warnings.
+	* testsuite/ld-aarch64/pcrel_pic_defined_local.d: Rename ...
+	* testsuite/ld-aarch64/pcrel_pic_defined.d: ... to this.
+	Update expected warnings.
+
 2017-06-15  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* exsup.c (elf_shlib_list_options): Display "-z stack-size=SIZE"
diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index f171f6f..b9c9885 100644
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -195,7 +195,7 @@ run_dump_test_lp64 "local-addend-r"
 
 # test error handling on pcrel relocation for shared libraries.
 run_dump_test_lp64 "pcrel_pic_undefined"
-run_dump_test_lp64 "pcrel_pic_defined_local"
+run_dump_test_lp64 "pcrel_pic_defined"
 
 run_dump_test "limit-b"
 run_dump_test "limit-bl"
diff --git a/ld/testsuite/ld-aarch64/pcrel.s b/ld/testsuite/ld-aarch64/pcrel.s
index df542ef..c5e18d0 100644
--- a/ld/testsuite/ld-aarch64/pcrel.s
+++ b/ld/testsuite/ld-aarch64/pcrel.s
@@ -1,3 +1,4 @@
+	.hidden global_b
 	.text
 	.align 2
 main:
@@ -18,3 +19,8 @@ main:
 	.word	global_a - .
 	.xword	global_a - .
 
+	# Defined global symbol may bind externally because of copy relocation,
+	# while defined hidden symbol binds locally.  LD should be able to
+	# differenciate this.
+	adrp	x0, :pg_hi21:global_b
+	.xword	global_b - .
diff --git a/ld/testsuite/ld-aarch64/pcrel_pic_defined.d b/ld/testsuite/ld-aarch64/pcrel_pic_defined.d
new file mode 100644
index 0000000..743e810
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/pcrel_pic_defined.d
@@ -0,0 +1,10 @@
+#name: PC-Rel relocation against defined
+#source: pcrel.s
+#ld: -shared -e0 -defsym global_a=0x1000 -defsym global_b=0x2000
+#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21_NC against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_ADR_PREL_LO21 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_LD_PREL_LO19 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL16 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL32 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL64 against symbol `global_a.*bind externally.*fPIC.*
diff --git a/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d b/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d
deleted file mode 100644
index 832652f..0000000
--- a/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d
+++ /dev/null
@@ -1,5 +0,0 @@
-#name: PC-Rel relocation against defined
-#source: pcrel.s
-#objdump: -r
-#ld: -shared -e0 -defsym global_a=0x1000
-#...
diff --git a/ld/testsuite/ld-aarch64/pcrel_pic_undefined.d b/ld/testsuite/ld-aarch64/pcrel_pic_undefined.d
index de7f020..f7f048d 100644
--- a/ld/testsuite/ld-aarch64/pcrel_pic_undefined.d
+++ b/ld/testsuite/ld-aarch64/pcrel_pic_undefined.d
@@ -1,10 +1,10 @@
 #name: PC-Rel relocation against undefined
 #source: pcrel.s
-#ld: -shared -e0
-#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21 against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21_NC against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_ADR_PREL_LO21 against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_LD_PREL_LO19 against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_PREL16 against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_PREL32 against external symbol.*fPIC.*
-#warning: .*: relocation R_AARCH64_PREL64 against external symbol.*fPIC.*
+#ld: -shared -e0 -defsym global_b=0x2000
+#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_ADR_PREL_PG_HI21_NC against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_ADR_PREL_LO21 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_LD_PREL_LO19 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL16 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL32 against symbol `global_a.*bind externally.*fPIC.*
+#warning: .*: relocation R_AARCH64_PREL64 against symbol `global_a.*bind externally.*fPIC.*