Ignore DWARF debug information with a version of 0 - assume that it is padding.

	PR 19872
bfd	* dwarf2.c (parse_comp_unit): Skip warning about unrecognised
	version number if the version is zero.

bin	* dwarf.c (display_debug_aranges): Skip warning about unrecognised
	version number if the version is zero.

7 files changed, 276 insertions, 73 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 9b87780..42d112f 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2016-04-04  Nick Clifton  <nickc@redhat.com>
+
+	PR 19872
+	* dwarf2.c (parse_comp_unit): Skip warning about unrecognised
+	version number if the version is zero.
+
 2016-04-01  Alan Modra  <amodra@gmail.com>
 
 	PR 19886
diff --git a/bfd/dwarf2.c b/bfd/dwarf2.c
index addfbf5..33370ac 100644
--- a/bfd/dwarf2.c
+++ b/bfd/dwarf2.c
@@ -2757,11 +2757,18 @@ parse_comp_unit (struct dwarf2_debug *stash,
 
   if (version != 2 && version != 3 && version != 4)
     {
-      (*_bfd_error_handler)
-	(_("Dwarf Error: found dwarf version '%u', this reader"
-	   " only handles version 2, 3 and 4 information."), version);
-      bfd_set_error (bfd_error_bad_value);
-      return 0;
+      /* PR 19872: A version number of 0 probably means that there is padding
+	 at the end of the .debug_info section.  Gold puts it there when
+	 performing an incremental link, for example.  So do not generate
+	 an error, just return a NULL.  */
+      if (version)
+	{
+	  (*_bfd_error_handler)
+	    (_("Dwarf Error: found dwarf version '%u', this reader"
+	       " only handles version 2, 3 and 4 information."), version);
+	  bfd_set_error (bfd_error_bad_value);
+	}
+      return NULL;
     }
 
   if (addr_size > sizeof (bfd_vma))
@@ -2772,7 +2779,7 @@ parse_comp_unit (struct dwarf2_debug *stash,
 	 addr_size,
 	 (unsigned int) sizeof (bfd_vma));
       bfd_set_error (bfd_error_bad_value);
-      return 0;
+      return NULL;
     }
 
   if (addr_size != 2 && addr_size != 4 && addr_size != 8)
@@ -2781,22 +2788,23 @@ parse_comp_unit (struct dwarf2_debug *stash,
 	("Dwarf Error: found address size '%u', this reader"
 	 " can only handle address sizes '2', '4' and '8'.", addr_size);
       bfd_set_error (bfd_error_bad_value);
-      return 0;
+      return NULL;
     }
 
   /* Read the abbrevs for this compilation unit into a table.  */
   abbrevs = read_abbrevs (abfd, abbrev_offset, stash);
   if (! abbrevs)
-    return 0;
+    return NULL;
 
   abbrev_number = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, end_ptr);
   info_ptr += bytes_read;
   if (! abbrev_number)
     {
-      (*_bfd_error_handler) (_("Dwarf Error: Bad abbrev number: %u."),
-			     abbrev_number);
-      bfd_set_error (bfd_error_bad_value);
-      return 0;
+      /* PR 19872: An abbrev number of 0 probably means that there is padding
+	 at the end of the .debug_abbrev section.  Gold puts it there when
+	 performing an incremental link, for example.  So do not generate
+	 an error, just return a NULL.  */
+      return NULL;
     }
 
   abbrev = lookup_abbrev (abbrev_number, abbrevs);
@@ -2805,7 +2813,7 @@ parse_comp_unit (struct dwarf2_debug *stash,
       (*_bfd_error_handler) (_("Dwarf Error: Could not find abbrev number %u."),
 			     abbrev_number);
       bfd_set_error (bfd_error_bad_value);
-      return 0;
+      return NULL;
     }
 
   amt = sizeof (struct comp_unit);
diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index ad58eb9..b4f5286 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,9 @@
+2016-04-04  Nick Clifton  <nickc@redhat.com>
+
+	PR 19872
+	* dwarf.c (display_debug_aranges): Skip warning about unrecognised
+	version number if the version is zero.
+
 2016-03-29  Alan Modra  <amodra@gmail.com>
 
 	* readelf.c (get_data): Use BFD_VMA_FMT to print bfd_size_type vars.
diff --git a/binutils/dwarf.c b/binutils/dwarf.c
index 086df4b..80f6b87 100644
--- a/binutils/dwarf.c
+++ b/binutils/dwarf.c
@@ -4910,7 +4910,12 @@ display_debug_aranges (struct dwarf_section *section,
 
       if (arange.ar_version != 2 && arange.ar_version != 3)
 	{
-	  warn (_("Only DWARF 2 and 3 aranges are currently supported.\n"));
+	  /* PR 19872: A version number of 0 probably means that there is
+	     padding at the end of the .debug_aranges section.  Gold puts
+	     it there when performing an incremental link, for example.
+	     So do not generate a warning in this case.  */
+	  if (arange.ar_version)
+	    warn (_("Only DWARF 2 and 3 aranges are currently supported.\n"));
 	  break;
 	}
 
diff --git a/ld/emultempl/pe.em b/ld/emultempl/pe.em
index bf146f6..c13fa4d 100644
--- a/ld/emultempl/pe.em
+++ b/ld/emultempl/pe.em
@@ -1059,10 +1059,38 @@ pe_undef_cdecl_match (struct bfd_link_hash_entry *h, void *inf)
   return TRUE;
 }
 
+/* Change UNDEF to a defined symbol, taking data from SYM.  */
+
+static void
+change_undef (struct bfd_link_hash_entry * undef,
+	      struct bfd_link_hash_entry * sym)
+{
+  static bfd_boolean  gave_warning_message = FALSE;
+
+  undef->type = bfd_link_hash_defined;
+  undef->u.def.value = sym->u.def.value;
+  undef->u.def.section = sym->u.def.section;
+
+  if (pe_enable_stdcall_fixup == -1)
+    {
+      einfo (_("Warning: resolving %s by linking to %s\n"),
+	     undef->root.string, sym->root.string);
+
+      if (! gave_warning_message)
+	{
+	  einfo (_("Use --enable-stdcall-fixup to disable these warnings\n"));
+	  einfo (_("Use --disable-stdcall-fixup to disable these fixups\n"));
+	  gave_warning_message = TRUE;
+	}
+    }
+
+  /* PR 19803: Make sure that the linked symbol is not garbage collected.  */
+  lang_add_gc_name (sym->root.string);
+}
+
 static void
 pe_fixup_stdcalls (void)
 {
-  static int gave_warning_message = 0;
   struct bfd_link_hash_entry *undef, *sym;
 
   if (pe_dll_extra_pe_debug)
@@ -1071,69 +1099,39 @@ pe_fixup_stdcalls (void)
   for (undef = link_info.hash->undefs; undef; undef=undef->u.undef.next)
     if (undef->type == bfd_link_hash_undefined)
       {
-	char* at = strchr (undef->root.string, '@');
-	int lead_at = (*undef->root.string == '@');
+	const char * name = undef->root.string;
+	char * at;
+	int lead_at = (*name == '@');
+
 	if (lead_at)
-	  at = strchr (undef->root.string + 1, '@');
+	  at = strchr (name + 1, '@');
+	else
+	  at = strchr (name, '@');
 
 	if (at || lead_at)
 	  {
 	    /* The symbol is a stdcall symbol, so let's look for a
 	       cdecl symbol with the same name and resolve to that.  */
-	    char *cname = xstrdup (undef->root.string);
+	    char *cname = xstrdup (name);
 
 	    if (lead_at)
 	      *cname = '_';
-	    at = strchr (cname, '@');
-	    if (at)
-	      *at = 0;
-	    sym = bfd_link_hash_lookup (link_info.hash, cname, 0, 0, 1);
+	    if (at)	      
+	      * strchr (cname, '@') = 0;
+	    sym = bfd_link_hash_lookup (link_info.hash, cname, FALSE, FALSE, TRUE);
 
 	    if (sym && sym->type == bfd_link_hash_defined)
-	      {
-		undef->type = bfd_link_hash_defined;
-		undef->u.def.value = sym->u.def.value;
-		undef->u.def.section = sym->u.def.section;
-
-		if (pe_enable_stdcall_fixup == -1)
-		  {
-		    einfo (_("Warning: resolving %s by linking to %s\n"),
-			   undef->root.string, cname);
-		    if (! gave_warning_message)
-		      {
-			gave_warning_message = 1;
-			einfo (_("Use --enable-stdcall-fixup to disable these warnings\n"));
-			einfo (_("Use --disable-stdcall-fixup to disable these fixups\n"));
-		      }
-		  }
-	      }
+	      change_undef (undef, sym);
 	  }
 	else
 	  {
 	    /* The symbol is a cdecl symbol, so we look for stdcall
 	       symbols - which means scanning the whole symbol table.  */
-	    pe_undef_found_sym = 0;
+	    pe_undef_found_sym = NULL;
 	    bfd_link_hash_traverse (link_info.hash, pe_undef_cdecl_match,
-				    (char *) undef->root.string);
-	    sym = pe_undef_found_sym;
-	    if (sym)
-	      {
-		undef->type = bfd_link_hash_defined;
-		undef->u.def.value = sym->u.def.value;
-		undef->u.def.section = sym->u.def.section;
-
-		if (pe_enable_stdcall_fixup == -1)
-		  {
-		    einfo (_("Warning: resolving %s by linking to %s\n"),
-			   undef->root.string, sym->root.string);
-		    if (! gave_warning_message)
-		      {
-			gave_warning_message = 1;
-			einfo (_("Use --enable-stdcall-fixup to disable these warnings\n"));
-			einfo (_("Use --disable-stdcall-fixup to disable these fixups\n"));
-		      }
-		  }
-	      }
+				    (char *) name);
+	    if (pe_undef_found_sym)
+	      change_undef (undef, pe_undef_found_sym);
 	  }
       }
 }
diff --git a/ld/pe-dll.c b/ld/pe-dll.c
index a280647..1f176ec 100644
--- a/ld/pe-dll.c
+++ b/ld/pe-dll.c
@@ -905,6 +905,9 @@ process_def_file_and_drectve (bfd *abfd ATTRIBUTE_UNUSED, struct bfd_link_info *
 	{
 	  *name = '_';
 	  strcpy (name + 1, int_name);
+
+	  /* PR 19803: The alias must be preserved as well.  */
+	  lang_add_gc_name (xstrdup (name));
 	}
       else
 	strcpy (name, int_name);
diff --git a/sim/aarch64/simulator.c b/sim/aarch64/simulator.c
index b4c8654..70e15c3 100644
--- a/sim/aarch64/simulator.c
+++ b/sim/aarch64/simulator.c
@@ -5322,6 +5322,90 @@ do_vec_FCVTZS (sim_cpu *cpu)
 }
 
 static void
+do_vec_REV64 (sim_cpu *cpu)
+{
+  /* instr[31]    = 0
+     instr[30]    = full/half
+     instr[29,24] = 00 1110 
+     instr[23,22] = size
+     instr[21,10] = 10 0000 0000 10
+     instr[9,5]   = Rn
+     instr[4,0]   = Rd.  */
+
+  unsigned rn = INSTR (9, 5);
+  unsigned rd = INSTR (4, 0);
+  unsigned size = INSTR (23, 22);
+  unsigned full = INSTR (30, 30);
+  unsigned i;
+  FRegister val;
+
+  NYI_assert (29, 24, 0x0E);
+  NYI_assert (21, 10, 0x802);
+
+  switch (size)
+    {
+    case 0:
+      for (i = 0; i < (full ? 16 : 8); i++)
+	val.b[i ^ 0x7] = aarch64_get_vec_u8 (cpu, rn, i);
+      break;
+
+    case 1:
+      for (i = 0; i < (full ? 8 : 4); i++)
+	val.h[i ^ 0x3] = aarch64_get_vec_u16 (cpu, rn, i);
+      break;
+
+    case 2:
+      for (i = 0; i < (full ? 4 : 2); i++)
+	val.w[i ^ 0x1] = aarch64_get_vec_u32 (cpu, rn, i);
+      break;
+      
+    case 3:
+      HALT_UNALLOC;
+    }
+
+  aarch64_set_vec_u64 (cpu, rd, 0, val.v[0]);
+  if (full)
+    aarch64_set_vec_u64 (cpu, rd, 1, val.v[1]);
+}
+
+static void
+do_vec_REV16 (sim_cpu *cpu)
+{
+  /* instr[31]    = 0
+     instr[30]    = full/half
+     instr[29,24] = 00 1110 
+     instr[23,22] = size
+     instr[21,10] = 10 0000 0001 10
+     instr[9,5]   = Rn
+     instr[4,0]   = Rd.  */
+
+  unsigned rn = INSTR (9, 5);
+  unsigned rd = INSTR (4, 0);
+  unsigned size = INSTR (23, 22);
+  unsigned full = INSTR (30, 30);
+  unsigned i;
+  FRegister val;
+
+  NYI_assert (29, 24, 0x0E);
+  NYI_assert (21, 10, 0x806);
+
+  switch (size)
+    {
+    case 0:
+      for (i = 0; i < (full ? 16 : 8); i++)
+	val.b[i ^ 0x1] = aarch64_get_vec_u8 (cpu, rn, i);
+      break;
+
+    default:
+      HALT_UNALLOC;
+    }
+
+  aarch64_set_vec_u64 (cpu, rd, 0, val.v[0]);
+  if (full)
+    aarch64_set_vec_u64 (cpu, rd, 1, val.v[1]);
+}
+
+static void
 do_vec_op1 (sim_cpu *cpu)
 {
   /* instr[31]    = 0
@@ -5389,6 +5473,9 @@ do_vec_op1 (sim_cpu *cpu)
 
   switch (INSTR (15, 10))
     {
+    case 0x02: do_vec_REV64 (cpu); return;
+    case 0x06: do_vec_REV16 (cpu); return;
+
     case 0x07:
       switch (INSTR (23, 21))
 	{
@@ -6442,6 +6529,89 @@ do_vec_MOV_element (sim_cpu *cpu)
 }
 
 static void
+do_vec_REV32 (sim_cpu *cpu)
+{
+  /* instr[31]    = 0
+     instr[30]    = full/half
+     instr[29,24] = 10 1110 
+     instr[23,22] = size
+     instr[21,10] = 10 0000 0000 10
+     instr[9,5]   = Rn
+     instr[4,0]   = Rd.  */
+
+  unsigned rn = INSTR (9, 5);
+  unsigned rd = INSTR (4, 0);
+  unsigned size = INSTR (23, 22);
+  unsigned full = INSTR (30, 30);
+  unsigned i;
+  FRegister val;
+
+  NYI_assert (29, 24, 0x2E);
+  NYI_assert (21, 10, 0x802);
+
+  switch (size)
+    {
+    case 0:
+      for (i = 0; i < (full ? 16 : 8); i++)
+	val.b[i ^ 0x3] = aarch64_get_vec_u8 (cpu, rn, i);
+      break;
+
+    case 1:
+      for (i = 0; i < (full ? 8 : 4); i++)
+	val.h[i ^ 0x1] = aarch64_get_vec_u16 (cpu, rn, i);
+      break;
+
+    default:
+      HALT_UNALLOC;
+    }
+
+  aarch64_set_vec_u64 (cpu, rd, 0, val.v[0]);
+  if (full)
+    aarch64_set_vec_u64 (cpu, rd, 1, val.v[1]);
+}
+
+static void
+do_vec_EXT (sim_cpu *cpu)
+{
+  /* instr[31]    = 0
+     instr[30]    = full/half
+     instr[29,21] = 10 1110 000
+     instr[20,16] = Vm
+     instr[15]    = 0
+     instr[14,11] = source index
+     instr[10]    = 0
+     instr[9,5]   = Vn
+     instr[4.0]   = Vd.  */
+
+  unsigned vm = INSTR (20, 16);
+  unsigned vn = INSTR (9, 5);
+  unsigned vd = INSTR (4, 0);
+  unsigned src_index = INSTR (14, 11);
+  unsigned full = INSTR (30, 30);
+  unsigned i;
+  unsigned j;
+  FRegister val;
+
+  NYI_assert (31, 21, 0x370);
+  NYI_assert (15, 15, 0);
+  NYI_assert (10, 10, 0);
+
+  if (!full && (src_index & 0x8))
+    HALT_UNALLOC;
+
+  j = 0;
+
+  for (i = src_index; i < (full ? 16 : 8); i++)
+    val.b[j ++] = aarch64_get_vec_u8 (cpu, vn, i);
+  for (i = 0; i < src_index; i++)
+    val.b[j ++] = aarch64_get_vec_u8 (cpu, vm, i);
+
+  aarch64_set_vec_u64 (cpu, vd, 0, val.v[0]);
+  if (full)
+    aarch64_set_vec_u64 (cpu, vd, 1, val.v[1]);
+}
+
+static void
 dexAdvSIMD0 (sim_cpu *cpu)
 {
   /* instr [28,25] = 0 111.  */
@@ -6484,22 +6654,15 @@ dexAdvSIMD0 (sim_cpu *cpu)
     case 0x0E: do_vec_op1 (cpu); return;
     case 0x0F: do_vec_op2 (cpu); return;
 
-    case 0x2f:
-      switch (INSTR (15, 10))
-	{
-	case 0x01: do_vec_SSHR_USHR (cpu); return;
-	case 0x10:
-	case 0x12: do_vec_mls_indexed (cpu); return;
-	case 0x29: do_vec_xtl (cpu); return;
-	default:
-	  HALT_NYI;
-	}
-
     case 0x2E:
       if (INSTR (21, 21) == 1)
 	{
 	  switch (INSTR (15, 10))
 	    {
+	    case 0x02:
+	      do_vec_REV32 (cpu);
+	      return;
+
 	    case 0x07:
 	      switch (INSTR (23, 22))
 		{
@@ -6550,7 +6713,10 @@ dexAdvSIMD0 (sim_cpu *cpu)
 
       if (INSTR (31, 21) == 0x370)
 	{
-	  do_vec_MOV_element (cpu);
+	  if (INSTR (10, 10))
+	    do_vec_MOV_element (cpu);
+	  else
+	    do_vec_EXT (cpu);
 	  return;
 	}
 
@@ -6568,6 +6734,17 @@ dexAdvSIMD0 (sim_cpu *cpu)
 	}
       break;
 
+    case 0x2f:
+      switch (INSTR (15, 10))
+	{
+	case 0x01: do_vec_SSHR_USHR (cpu); return;
+	case 0x10:
+	case 0x12: do_vec_mls_indexed (cpu); return;
+	case 0x29: do_vec_xtl (cpu); return;
+	default:
+	  HALT_NYI;
+	}
+
     default:
       break;
     }