* elf64-aarch64.c (elf_backend_can_gc_sections): Enable

gc-section support.
        (elf64_aarch64_gc_sweep_hook): Handle GOT, TLS and PLT related relocs.

        * lib/ld-lib.exp (check_gc_sections_available): Remove aarch64
from list of
        targets that don't support gc-section.

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index d4b07a9840928da194437bf04adddb3bef7ee987..42d6c27dfa74857be1a1af20e5488bb9681aea51 100644 (file)
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,10 @@
+2013-03-08  Venkataramanan Kumar  <venkataramanan.kumar@linaro.org>
+
+        * elf64-aarch64.c (elf_backend_can_gc_sections): Enable gc-section
+       support.
+        (elf64_aarch64_gc_sweep_hook): Handle GOT, TLS and PLT related
+       relocs.
+
 2013-03-08  Andreas Arnez  <arnez@linux.vnet.ibm.com>
 
        * elf-bfd.h (elfcore_write_s390_tdb): Add prototype.

diff --git a/bfd/elf64-aarch64.c b/bfd/elf64-aarch64.c
index 61909b92225d13ebb612495543acec102e7358f1..94d90c5e4ce7aa021deabac88eea1287242f18b7 100644 (file)
--- a/bfd/elf64-aarch64.c
+++ b/bfd/elf64-aarch64.c
@@ -1,5 +1,5 @@
 /* ELF support for AArch64.
-   Copyright 2009, 2010, 2011, 2012  Free Software Foundation, Inc.
+   Copyright 2009-2013 Free Software Foundation, Inc.
    Contributed by ARM Ltd.
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -4875,6 +4875,137 @@ elf64_aarch64_gc_sweep_hook (bfd *abfd ATTRIBUTE_UNUSED,
                             const Elf_Internal_Rela *
                             relocs ATTRIBUTE_UNUSED)
 {
+  struct elf64_aarch64_link_hash_table *htab;
+  Elf_Internal_Shdr *symtab_hdr;
+  struct elf_link_hash_entry **sym_hashes;
+  bfd_signed_vma *local_got_refcounts;
+  const Elf_Internal_Rela *rel, *relend;
+
+  if (info->relocatable)
+    return TRUE;
+
+  htab = elf64_aarch64_hash_table (info);
+
+  if (htab == NULL)
+    return FALSE;
+
+  elf_section_data (sec)->local_dynrel = NULL;
+
+  symtab_hdr = &elf_symtab_hdr (abfd);
+  sym_hashes = elf_sym_hashes (abfd);
+
+  local_got_refcounts = elf_local_got_refcounts (abfd);
+
+  relend = relocs + sec->reloc_count;
+  for (rel = relocs; rel < relend; rel++)
+    {
+      unsigned long r_symndx;
+      unsigned int r_type;
+      struct elf_link_hash_entry *h = NULL;
+
+      r_symndx = ELF64_R_SYM (rel->r_info);
+
+      if (r_symndx >= symtab_hdr->sh_info)
+       {
+         struct elf64_aarch64_link_hash_entry *eh;
+         struct elf_dyn_relocs **pp;
+         struct elf_dyn_relocs *p;
+
+         h = sym_hashes[r_symndx - symtab_hdr->sh_info];
+         while (h->root.type == bfd_link_hash_indirect
+                || h->root.type == bfd_link_hash_warning)
+           h = (struct elf_link_hash_entry *) h->root.u.i.link;
+         eh = (struct elf64_aarch64_link_hash_entry *) h;
+
+         for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
+           {
+             if (p->sec == sec)
+               {
+                 /* Everything must go for SEC.  */
+                 *pp = p->next;
+                 break;
+               }
+           }
+        }
+      else
+       {
+         Elf_Internal_Sym *isym;
+
+         /* A local symbol.  */
+         isym = bfd_sym_from_r_symndx (&htab->sym_cache,
+                                       abfd, r_symndx);
+         if (isym == NULL)
+           return FALSE;
+       }
+
+      r_type = ELF64_R_TYPE (rel->r_info);
+      r_type = aarch64_tls_transition (abfd,info, r_type, h ,r_symndx);
+      switch (r_type)
+       {
+       case R_AARCH64_LD64_GOT_LO12_NC:
+       case R_AARCH64_GOT_LD_PREL19:
+       case R_AARCH64_ADR_GOT_PAGE:
+       case R_AARCH64_TLSGD_ADR_PAGE21:
+       case R_AARCH64_TLSGD_ADD_LO12_NC:
+       case R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
+       case R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
+       case R_AARCH64_TLSLE_ADD_TPREL_LO12:
+       case R_AARCH64_TLSLE_ADD_TPREL_HI12:
+       case R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
+       case R_AARCH64_TLSLE_MOVW_TPREL_G2:
+       case R_AARCH64_TLSLE_MOVW_TPREL_G1:
+       case R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
+       case R_AARCH64_TLSLE_MOVW_TPREL_G0:
+       case R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
+       case R_AARCH64_TLSDESC_ADR_PAGE:
+       case R_AARCH64_TLSDESC_ADD_LO12_NC:
+       case R_AARCH64_TLSDESC_LD64_LO12_NC:
+          if (h != NULL)
+           {
+             if (h->got.refcount > 0)
+               h->got.refcount -= 1;
+           }
+         else if (local_got_refcounts != NULL)
+           {
+             if (local_got_refcounts[r_symndx] > 0)
+               local_got_refcounts[r_symndx] -= 1;
+           }
+         break;
+
+       case R_AARCH64_ADR_PREL_PG_HI21_NC:
+       case R_AARCH64_ADR_PREL_PG_HI21:
+       case R_AARCH64_ADR_PREL_LO21:
+         if (h != NULL && info->executable)
+           {
+             if (h->plt.refcount > 0)
+               h->plt.refcount -= 1;
+           }
+         break;
+
+       case R_AARCH64_CALL26:
+       case R_AARCH64_JUMP26:
+          /* If this is a local symbol then we resolve it
+             directly without creating a PLT entry.  */
+         if (h == NULL)
+           continue;
+
+         if (h->plt.refcount > 0)
+           h->plt.refcount -= 1;
+         break;
+
+       case R_AARCH64_ABS64:
+         if (h != NULL && info->executable)
+           {
+             if (h->plt.refcount > 0)
+               h->plt.refcount -= 1;
+           }
+         break;
+        
+       default:
+         break;
+       }
+    }
+
   return TRUE;
 }
 
@@ -7049,7 +7180,7 @@ const struct elf_size_info elf64_aarch64_size_info =
   elf64_aarch64_size_info
 
 #define elf_backend_can_refcount       1
-#define elf_backend_can_gc_sections    0
+#define elf_backend_can_gc_sections    1
 #define elf_backend_plt_readonly       1
 #define elf_backend_want_got_plt       1
 #define elf_backend_want_plt_sym       0

diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index dd4ded2fc11ea89700e0522cdb40b3a09d7d0007..ffbf3f876b53e218886f9aa1a2a1af1586eff6de 100644 (file)
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-03-08  Venkataramanan Kumar  <venkataramanan.kumar@linaro.org>
+
+        * lib/ld-lib.exp (check_gc_sections_available): Remove aarch64
+       from list of targets that don't support gc-section.
+
 2013-03-05  Alan Modra  <amodra@gmail.com>
 
        * ld-scripts/rgn-at6.s, * ld-scripts/rgn-at6.t, * ld-scripts/rgn-at6.d,

diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index 4cd671d4734fc4801ac22f9314106006a825a079..4b88093eee4e39c4224fa92e5d021178e1927ca9 100644 (file)
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -1,7 +1,5 @@
 # Support routines for LD testsuite.
-#   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
-#    2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
-#    Free Software Foundation, Inc.
+#   Copyright 1994-2013 Free Software Foundation, Inc.
 #
 # This file is part of the GNU Binutils.
 #
@@ -1518,22 +1516,21 @@ proc check_gc_sections_available { } {
     if {![info exists gc_sections_available_saved]} {
        # Some targets don't support gc-sections despite whatever's
        # advertised by ld's options.
-       if {[istarget aarch64*-*-*]
-            || [istarget arc-*-*]
-            || [istarget d30v-*-*]
-            || [istarget dlx-*-*]
-            || [istarget i960-*-*]
-            || [istarget or32-*-*]
-            || [istarget pj*-*-*]
-            || [istarget alpha-*-*]
-            || [istarget hppa*64-*-*]
-            || [istarget i370-*-*]
-            || [istarget i860-*-*]
-            || [istarget ia64-*-*]
-            || [istarget mep-*-*]
-            || [istarget mn10200-*-*]
-            || [istarget *-*-cygwin]
-            || [istarget *-*-mingw*] } {
+       if {   [istarget arc-*-*]
+           || [istarget d30v-*-*]
+           || [istarget dlx-*-*]
+           || [istarget i960-*-*]
+           || [istarget or32-*-*]
+           || [istarget pj*-*-*]
+           || [istarget alpha-*-*]
+           || [istarget hppa*64-*-*]
+           || [istarget i370-*-*]
+           || [istarget i860-*-*]
+           || [istarget ia64-*-*]
+           || [istarget mep-*-*]
+           || [istarget mn10200-*-*]
+           || [istarget *-*-cygwin]
+           || [istarget *-*-mingw*] } {
            set gc_sections_available_saved 0
            return 0
        }