[AArch64] Improve PC-relative relocation check for shared library

2015-04-24  Jiong. Wang  <jiong.wang@arm.com>

bfd/
  * elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Reject
  PC-relative relocation for external symbol.

ld/testsuite/
  * ld-aarch64/pcrel.s: New testcase.
  * ld-aarch64/pcrel_pic_defiend_local.d: New expect file.
  * ld-aarch64/pcrel_pic_undefined.d: Ditto.
  * ld-aarch64/aarch64-elf.exp: Run them.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 87e22c2..3c33fad 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,8 @@
+2015-04-24  Jiong Wang  <jiong.wang@arm.com>
+
+       * elfnn-aarch64.c (elfNN_aarch64_final_link_relocate): Reject
+       PC-relative relocation for external symbol.
+
 2015-04-24  Nick Clifton  <nickc@redhat.com>
 
        PR 18313

diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
index 85cf856..c98987b 100644 (file)
--- a/bfd/elfnn-aarch64.c
+++ b/bfd/elfnn-aarch64.c
@@ -4801,16 +4801,36 @@ elfNN_aarch64_final_link_relocate (reloc_howto_type *howto,
                                                   signed_addend, weak_undef_p);
       break;
 
+    case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
+    case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
+    case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
+    case BFD_RELOC_AARCH64_LD_LO19_PCREL:
+    case BFD_RELOC_AARCH64_16_PCREL:
+    case BFD_RELOC_AARCH64_32_PCREL:
+    case BFD_RELOC_AARCH64_64_PCREL:
+      if (info->shared
+         && (input_section->flags & SEC_ALLOC) != 0
+         && (input_section->flags & SEC_READONLY) != 0
+         && h != NULL
+         && !h->def_regular)
+       {
+         int howto_index = bfd_r_type - BFD_RELOC_AARCH64_RELOC_START;
+
+         (*_bfd_error_handler)
+           (_("%B: relocation %s against external symbol `%s' 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);
+         return FALSE;
+       }
+
     case BFD_RELOC_AARCH64_16:
 #if ARCH_SIZE == 64
     case BFD_RELOC_AARCH64_32:
 #endif
     case BFD_RELOC_AARCH64_ADD_LO12:
-    case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
-    case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
-    case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
     case BFD_RELOC_AARCH64_BRANCH19:
-    case BFD_RELOC_AARCH64_LD_LO19_PCREL:
     case BFD_RELOC_AARCH64_LDST8_LO12:
     case BFD_RELOC_AARCH64_LDST16_LO12:
     case BFD_RELOC_AARCH64_LDST32_LO12:
@@ -4826,9 +4846,6 @@ elfNN_aarch64_final_link_relocate (reloc_howto_type *howto,
     case BFD_RELOC_AARCH64_MOVW_G2:
     case BFD_RELOC_AARCH64_MOVW_G2_NC:
     case BFD_RELOC_AARCH64_MOVW_G3:
-    case BFD_RELOC_AARCH64_16_PCREL:
-    case BFD_RELOC_AARCH64_32_PCREL:
-    case BFD_RELOC_AARCH64_64_PCREL:
     case BFD_RELOC_AARCH64_TSTBR14:
       value = _bfd_aarch64_elf_resolve_relocation (bfd_r_type, place, value,
                                                   signed_addend, weak_undef_p);

diff --git a/ld/testsuite/ld-aarch64/aarch64-elf.exp b/ld/testsuite/ld-aarch64/aarch64-elf.exp
index 895b1b2..bfbbe24 100644 (file)
--- a/ld/testsuite/ld-aarch64/aarch64-elf.exp
+++ b/ld/testsuite/ld-aarch64/aarch64-elf.exp
@@ -105,6 +105,10 @@ run_dump_test "emit-relocs-local-addend"
 # test addend correctness when -r specified.
 run_dump_test "local-addend-r"
 
+# test error handling on pcrel relocation for shared libraries.
+run_dump_test "pcrel_pic_undefined"
+run_dump_test "pcrel_pic_defined_local"
+
 run_dump_test "limit-b"
 run_dump_test "limit-bl"
 run_dump_test "farcall-section"

diff --git a/ld/testsuite/ld-aarch64/pcrel.s b/ld/testsuite/ld-aarch64/pcrel.s
new file mode 100644 (file)
index 0000000..df542ef
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/pcrel.s
@@ -0,0 +1,20 @@
+       .text
+       .align 2
+main:
+       # R_AARCH64_ADR_PREL_PG_HI21
+       # R_AARCH64_ADR_PREL_PG_HI21_NC
+       # R_AARCH64_ADR_LO_21
+       adrp    x0, :pg_hi21:global_a
+       adrp    x1, :pg_hi21_nc:global_a
+       adr     x2, global_a
+
+       #R_AARCH64_LD_PREL_LO19
+       ldr     x3, global_a
+
+       # R_AARCH64_PREL16
+       # R_AARCH64_PREL32
+       # R_AARCH64_PREL64
+       .hword  global_a - .
+       .word   global_a - .
+       .xword  global_a - .
+

diff --git a/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d b/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d
new file mode 100644 (file)
index 0000000..832652f
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/pcrel_pic_defined_local.d
@@ -0,0 +1,5 @@
+#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
new file mode 100644 (file)
index 0000000..de7f020
--- /dev/null
+++ b/ld/testsuite/ld-aarch64/pcrel_pic_undefined.d
@@ -0,0 +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.*