[AArch64][Backport] Generate DT_TEXTREL for relocation against RO section

2015-06-23  Jiong Wang  <jiong.wang@arm.com>

  Apply from master:
  2015-06-23  Jiong. Wang  <jiong.wang@arm.com>

  bfd/
    * elfnn-aarch64.c (aarch64_readonly_dynrelocs): New function.
    (elfNN_aarch64_size_dynamic_sections): Traverse hash table to check
    relocations against read-only sections.

  ld/testsuite/
    * ld-aarch64/dt_textrel.s: New testcase.
    * ld-aarch64/dt_textrel.d: New expectation file.
    * ld-aarch64/aarch64-elf.exp: Run new testcase.

6 files changed, 66 insertions, 0 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index d39fddd..d994eac 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,12 @@
+2015-06-23  Jiong Wang  <jiong.wang@arm.com>
+
+	Apply from master:
+	2015-06-23  Jiong. Wang  <jiong.wang@arm.com>
+
+	* elfnn-aarch64.c (aarch64_readonly_dynrelocs): New function.
+	(elfNN_aarch64_size_dynamic_sections): Traverse hash table to check
+	relocations against read-only sections.
+
 2015-06-19  Nick Clifton  <nickc@redhat.com>
 
 	PR 18481
diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index 4593a65..11ea628 100644
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -6983,6 +6983,32 @@ elfNN_aarch64_allocate_local_ifunc_dynrelocs (void **slot, void *inf)
   return elfNN_aarch64_allocate_ifunc_dynrelocs (h, inf);
 }
 
+/* Find any dynamic relocs that apply to read-only sections.  */
+
+static bfd_boolean
+aarch64_readonly_dynrelocs (struct elf_link_hash_entry * h, void * inf)
+{
+  struct elf_aarch64_link_hash_entry * eh;
+  struct elf_dyn_relocs * p;
+
+  eh = (struct elf_aarch64_link_hash_entry *) h;
+  for (p = eh->dyn_relocs; p != NULL; p = p->next)
+    {
+      asection *s = p->sec;
+
+      if (s != NULL && (s->flags & SEC_READONLY) != 0)
+	{
+	  struct bfd_link_info *info = (struct bfd_link_info *) inf;
+
+	  info->flags |= DF_TEXTREL;
+
+	  /* Not an error, just cut short the traversal.  */
+	  return FALSE;
+	}
+    }
+  return TRUE;
+}
+
 /* This is the most important function of all . Innocuosly named
    though !  */
 static bfd_boolean
@@ -7270,6 +7296,10 @@ elfNN_aarch64_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
 
 	  /* If any dynamic relocs apply to a read-only section,
 	     then we need a DT_TEXTREL entry.  */
+	  if ((info->flags & DF_TEXTREL) == 0)
+	    elf_link_hash_traverse (& htab->root, aarch64_readonly_dynrelocs,
+				    info);
+
 	  if ((info->flags & DF_TEXTREL) != 0)
 	    {
 	      if (!add_dynamic_entry (DT_TEXTREL, 0))
diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index 7291a52..8be5614 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2015-06-23  Jiong Wang  <jiong.wang@arm.com>
+
+	Apply from master:
+	2015-06-23  Jiong. Wang  <jiong.wang@arm.com>
+
+	* ld-aarch64/dt_textrel.s: New testcase.
+	* ld-aarch64/dt_textrel.d: New expectation file.
+	* ld-aarch64/aarch64-elf.exp: Run new testcase.
+
 2015-06-17  Renlin Li  <renlin.li@arm.com>
 
 	Applied from master.
diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index 7a24e52..71b8163 100644
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -181,6 +181,8 @@ run_dump_test "ifunc-22"
 run_dump_test "relasz"
 run_dump_test "relocs-257-symbolic-func"
 
+run_dump_test "dt_textrel"
+
 set aarch64elflinktests {
   {"ld-aarch64/so with global symbol" "-shared" "" "" {copy-reloc-so.s}
   {} "copy-reloc-so.so"}
diff --git a/ld/testsuite/ld-aarch64/dt_textrel.d b/ld/testsuite/ld-aarch64/dt_textrel.d
new file mode 100644
index 0000000..2dbbd2f
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/dt_textrel.d
@@ -0,0 +1,7 @@
+#source: dt_textrel.s
+#ld: -shared
+#readelf: -d
+#...
+.*TEXTREL.*
+.*
+
diff --git a/ld/testsuite/ld-aarch64/dt_textrel.s b/ld/testsuite/ld-aarch64/dt_textrel.s
new file mode 100644
index 0000000..f37f456
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/dt_textrel.s
@@ -0,0 +1,9 @@
+	.cpu generic+fp+simd
+	.global	p
+	.comm	x,4,4
+	.section	.rodata
+	.align	3
+	.type	p, %object
+	.size	p, 8
+p:
+	.xword	x