ARM: Add support for value 3 of Tag_ABI_VFP_args attribute

*** bfd/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* elf32-arm.c (elf32_arm_merge_eabi_attributes): Handle new
	Tag_ABI_VFP_args value and replace hardcoded values by enum
	values.
	(elf32_arm_post_process_headers): Set e_flags in ELF header
	as hard float only when Tag_ABI_VFP_args is 1, using new enum
	value AEABI_VFP_args_vfp to check that.

*** binutils/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* readelf.c (arm_attr_tag_ABI_VFP_args): Add "compatible".

*** gdb/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm-tdep.c (arm_gdbarch_init): Explicitely handle value 3 of
	Tag_ABI_VFP_args. Also replace hardcoded values by enum values
	in the switch handling the different values of Tag_ABI_VFP_args.

*** gold/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm.cc (Target_arm::do_adjust_elf_header): Set e_flags in ELF
	header as hard float only when Tag_ABI_VFP_args is 1, using new
	enum value AEABI_VFP_args_vfp to check that.
	(Target_arm::merge_object_attributes): Handle new Tag_ABI_VFP_args
	value and replace hardcoded values by enum values.

*** include/elf/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* arm.h: New AEABI_FP_number_model_* and AEABI_VFP_args_* enum
	values.

*** ld/testsuite/ChangeLog ***

2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	* ld-arm/attr-merge-2a.s: Add Tag_ABI_VFP_args.
	* ld-arm/attr-merge-2b.s: Likewise.
	* ld-arm/attr-merge-2.attr: Likewise.
	* ld-arm/attr-merge-4a.s: Add Tag_ABI_FP_number_model and
	Tag_ABI_VFP_args.
	* ld-arm/attr-merge-4b.s: Likewise.
	* ld-arm/attr-merge-4.attr: Likewise.
	* ld-arm/attr-merge-6a.s: Likewise.
	* ld-arm/attr-merge-6b.s: Likewise.
	* ld-arm/attr-merge-6.attr: Add Tag_ABI_FP_number_model.

20 files changed, 107 insertions, 12 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index c85bd07..8bfb260 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,11 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* elf32-arm.c (elf32_arm_merge_eabi_attributes): Handle new
+	Tag_ABI_VFP_args value and replace hardcoded values by enum values.
+	(elf32_arm_post_process_headers): Set e_flags in ELF header as hard
+	float only when Tag_ABI_VFP_args is 1, using new enum value
+	AEABI_VFP_args_vfp to check that.
+
 2014-12-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* pei-x86_64.c (pex64_bfd_print_pdata_section): Add cast to
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 5b2f66f..09c5aa4 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -11753,10 +11753,14 @@ elf32_arm_merge_eabi_attributes (bfd *ibfd, bfd *obfd)
   /* This needs to happen before Tag_ABI_FP_number_model is merged.  */
   if (in_attr[Tag_ABI_VFP_args].i != out_attr[Tag_ABI_VFP_args].i)
     {
-      /* Ignore mismatches if the object doesn't use floating point.  */
-      if (out_attr[Tag_ABI_FP_number_model].i == 0)
+      /* Ignore mismatches if the object doesn't use floating point or is
+	 floating point ABI independent.  */
+      if (out_attr[Tag_ABI_FP_number_model].i == AEABI_FP_number_model_none
+	  || (in_attr[Tag_ABI_FP_number_model].i != AEABI_FP_number_model_none
+	      && out_attr[Tag_ABI_VFP_args].i == AEABI_VFP_args_compatible))
 	out_attr[Tag_ABI_VFP_args].i = in_attr[Tag_ABI_VFP_args].i;
-      else if (in_attr[Tag_ABI_FP_number_model].i != 0)
+      else if (in_attr[Tag_ABI_FP_number_model].i != AEABI_FP_number_model_none
+	       && in_attr[Tag_ABI_VFP_args].i != AEABI_VFP_args_compatible)
 	{
 	  _bfd_error_handler
 	    (_("error: %B uses VFP register arguments, %B does not"),
@@ -14719,7 +14723,7 @@ elf32_arm_post_process_headers (bfd * abfd, struct bfd_link_info * link_info ATT
       && ((i_ehdrp->e_type == ET_DYN) || (i_ehdrp->e_type == ET_EXEC)))
     {
       int abi = bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC, Tag_ABI_VFP_args);
-      if (abi)
+      if (abi == AEABI_VFP_args_vfp)
 	i_ehdrp->e_flags |= EF_ARM_ABI_FLOAT_HARD;
       else
 	i_ehdrp->e_flags |= EF_ARM_ABI_FLOAT_SOFT;
diff --git a/binutils/ChangeLog b/binutils/ChangeLog
index 6eae516..cf2cc03 100644
--- a/binutils/ChangeLog
+++ b/binutils/ChangeLog
@@ -1,3 +1,7 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* readelf.c (arm_attr_tag_ABI_VFP_args): Add "compatible".
+
 2014-12-24  Alexander Cherepanov  <cherepan@mccme.ru>
 
 	PR binutils/17671
diff --git a/binutils/readelf.c b/binutils/readelf.c
index d9ddb35..8a53248 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -12213,7 +12213,7 @@ static const char * arm_attr_tag_ABI_enum_size[] =
 static const char * arm_attr_tag_ABI_HardFP_use[] =
   {"As Tag_FP_arch", "SP only", "DP only", "SP and DP"};
 static const char * arm_attr_tag_ABI_VFP_args[] =
-  {"AAPCS", "VFP registers", "custom"};
+  {"AAPCS", "VFP registers", "custom", "compatible"};
 static const char * arm_attr_tag_ABI_WMMX_args[] =
   {"AAPCS", "WMMX registers", "custom"};
 static const char * arm_attr_tag_ABI_optimization_goals[] =
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index dc1cb15..d7373cd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* arm-tdep.c (arm_gdbarch_init): Explicitely handle value 3 of
+	Tag_ABI_VFP_args. Also replace hardcoded values by enum values in the
+	switch handling the different values of Tag_ABI_VFP_args.
+
 2014-12-23  Doug Evans  <xdje42@gmail.com>
 
 	* ada-lang.c (user_select_syms): Only fetch symtab if symbol is
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index a4f99c5..e12ae6e 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -9968,27 +9968,34 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
 							OBJ_ATTR_PROC,
 							Tag_ABI_VFP_args))
 			{
-			case 0:
+			case (int) AEABI_VFP_args_base:
 			  /* "The user intended FP parameter/result
 			     passing to conform to AAPCS, base
 			     variant".  */
 			  fp_model = ARM_FLOAT_SOFT_VFP;
 			  break;
-			case 1:
+			case (int) AEABI_VFP_args_vfp:
 			  /* "The user intended FP parameter/result
 			     passing to conform to AAPCS, VFP
 			     variant".  */
 			  fp_model = ARM_FLOAT_VFP;
 			  break;
-			case 2:
+			case (int) AEABI_VFP_args_toolchain:
 			  /* "The user intended FP parameter/result
 			     passing to conform to tool chain-specific
 			     conventions" - we don't know any such
 			     conventions, so leave it as "auto".  */
 			  break;
+			case (int) AEABI_VFP_args_compatible:
+			  /* "Code is compatible with both the base
+			     and VFP variants; the user did not permit
+			     non-variadic functions to pass FP
+			     parameters/results" - leave it as
+			     "auto".  */
+			  break;
 			default:
 			  /* Attribute value not mentioned in the
-			     October 2008 ABI, so leave it as
+			     November 2012 ABI, so leave it as
 			     "auto".  */
 			  break;
 			}
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 457fa6b..f4983cb 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,11 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* arm.cc (Target_arm::do_adjust_elf_header): Set e_flags in ELF header
+	as hard float only when Tag_ABI_VFP_args is 1, using new enum value
+	AEABI_VFP_args_vfp to check that.
+	(Target_arm::merge_object_attributes): Handle new Tag_ABI_VFP_args
+	value and replace hardcoded values by enum values.
+
 2014-12-22  Cary Coutant  <ccoutant@google.com>
 
 	* powerpc.cc (Target_powerpc::relocate): Fix overflow check.
diff --git a/gold/arm.cc b/gold/arm.cc
index 6c472bb..4186a2a 100644
--- a/gold/arm.cc
+++ b/gold/arm.cc
@@ -10056,7 +10056,7 @@ Target_arm<big_endian>::do_adjust_elf_header(
     if (type == elfcpp::ET_EXEC || type == elfcpp::ET_DYN)
       {
 	Object_attribute* attr = this->get_aeabi_object_attribute(elfcpp::Tag_ABI_VFP_args);
-	if (attr->int_value())
+	if (attr->int_value() == AEABI_VFP_args_vfp)
 	  flags |= elfcpp::EF_ARM_ABI_FLOAT_HARD;
 	else
 	  flags |= elfcpp::EF_ARM_ABI_FLOAT_SOFT;
@@ -10493,10 +10493,18 @@ Target_arm<big_endian>::merge_object_attributes(
       != out_attr[elfcpp::Tag_ABI_VFP_args].int_value())
     {
       // Ignore mismatches if the object doesn't use floating point.  */
-      if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0)
+      if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value()
+	  == AEABI_FP_number_model_none
+	  || (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value()
+	      != AEABI_FP_number_model_none
+	      && out_attr[elfcpp::Tag_ABI_VFP_args].int_value()
+		 == AEABI_VFP_args_compatible))
 	out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value(
 	    in_attr[elfcpp::Tag_ABI_VFP_args].int_value());
-      else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0
+      else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value()
+	       != AEABI_FP_number_model_none
+	       && in_attr[elfcpp::Tag_ABI_VFP_args].int_value()
+		  != AEABI_VFP_args_compatible
 	       && parameters->options().warn_mismatch())
 	gold_error(_("%s uses VFP register arguments, output does not"),
 		   name);
diff --git a/include/elf/ChangeLog b/include/elf/ChangeLog
index f4f7107..942923d 100644
--- a/include/elf/ChangeLog
+++ b/include/elf/ChangeLog
@@ -1,3 +1,7 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* arm.h: New AEABI_FP_number_model_* and AEABI_VFP_args_* enum values.
+
 2014-12-06  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* common.h (EM_VISIUM): Define.
diff --git a/include/elf/arm.h b/include/elf/arm.h
index 34afdfd..e85536b 100644
--- a/include/elf/arm.h
+++ b/include/elf/arm.h
@@ -319,6 +319,23 @@ enum
   Tag_VFP_HP_extension = Tag_FP_HP_extension
 };
 
+/* Values for Tag_ABI_FP_number_model.  */
+enum
+{
+  AEABI_FP_number_model_none = 0,
+  AEABI_FP_number_model_ieee754_number = 1,
+  AEABI_FP_number_model_rtabi = 2,
+  AEABI_FP_number_model_ieee754_all = 3
+};
+
+/* Values for Tag_ABI_VFP_args.  */
+enum
+{
+  AEABI_VFP_args_base = 0,
+  AEABI_VFP_args_vfp = 1,
+  AEABI_VFP_args_toolchain = 2,
+  AEABI_VFP_args_compatible = 3
+};
 #endif
 
 /* The name of the note section used to identify arm variants.  */
diff --git a/ld/testsuite/ChangeLog b/ld/testsuite/ChangeLog
index d987267..a8c5a79 100644
--- a/ld/testsuite/ChangeLog
+++ b/ld/testsuite/ChangeLog
@@ -1,3 +1,16 @@
+2014-12-25  Thomas Preud'homme  <thomas.preudhomme@arm.com>
+
+	* ld-arm/attr-merge-2a.s: Add Tag_ABI_VFP_args.
+	* ld-arm/attr-merge-2b.s: Likewise.
+	* ld-arm/attr-merge-2.attr: Likewise.
+	* ld-arm/attr-merge-4a.s: Add Tag_ABI_FP_number_model and
+	Tag_ABI_VFP_args.
+	* ld-arm/attr-merge-4b.s: Likewise.
+	* ld-arm/attr-merge-4.attr: Likewise.
+	* ld-arm/attr-merge-6a.s: Likewise.
+	* ld-arm/attr-merge-6b.s: Likewise.
+	* ld-arm/attr-merge-6.attr: Add Tag_ABI_FP_number_model.
+
 2014-12-24  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* ld/testsuite/ld-avr/relax-elf-flags-02.d: Add -mno-link-relax
diff --git a/ld/testsuite/ld-arm/attr-merge-2.attr b/ld/testsuite/ld-arm/attr-merge-2.attr
index 578333b..9f63df4 100644
--- a/ld/testsuite/ld-arm/attr-merge-2.attr
+++ b/ld/testsuite/ld-arm/attr-merge-2.attr
@@ -11,4 +11,5 @@ File Attributes
   Tag_ABI_align_needed: 8-byte
   Tag_ABI_align_preserved: 8-byte, except leaf SP
   Tag_ABI_enum_size: small
+  Tag_ABI_VFP_args: VFP registers
   Tag_ABI_optimization_goals: Aggressive Debug
diff --git a/ld/testsuite/ld-arm/attr-merge-2a.s b/ld/testsuite/ld-arm/attr-merge-2a.s
index 0303163..8a7260c 100644
--- a/ld/testsuite/ld-arm/attr-merge-2a.s
+++ b/ld/testsuite/ld-arm/attr-merge-2a.s
@@ -6,5 +6,6 @@
 	.eabi_attribute 24, 1
 	.eabi_attribute 25, 1
 	.eabi_attribute 26, 1
+	.eabi_attribute 28, 3
 	.eabi_attribute 30, 6
 	.file	"attr-merge-2a.s"
diff --git a/ld/testsuite/ld-arm/attr-merge-2b.s b/ld/testsuite/ld-arm/attr-merge-2b.s
index 047890a..a22776b 100644
--- a/ld/testsuite/ld-arm/attr-merge-2b.s
+++ b/ld/testsuite/ld-arm/attr-merge-2b.s
@@ -6,6 +6,7 @@
 	.eabi_attribute 24, 1
 	.eabi_attribute 25, 1
 	.eabi_attribute 26, 1
+	.eabi_attribute 28, 1
 	.eabi_attribute 30, 6
 	.eabi_attribute 18, 4
 	.file	"attr-merge-2b.s"
diff --git a/ld/testsuite/ld-arm/attr-merge-4.attr b/ld/testsuite/ld-arm/attr-merge-4.attr
index 75fd063..f74b024 100644
--- a/ld/testsuite/ld-arm/attr-merge-4.attr
+++ b/ld/testsuite/ld-arm/attr-merge-4.attr
@@ -5,4 +5,6 @@ File Attributes
   Tag_CPU_arch_profile: Microcontroller
   Tag_ARM_ISA_use: Yes
   Tag_THUMB_ISA_use: Thumb-1
+  Tag_ABI_FP_number_model: IEEE 754
+  Tag_ABI_VFP_args: compatible
   Tag_also_compatible_with: v6-M
diff --git a/ld/testsuite/ld-arm/attr-merge-4a.s b/ld/testsuite/ld-arm/attr-merge-4a.s
index b5b77bf..9282fa2 100644
--- a/ld/testsuite/ld-arm/attr-merge-4a.s
+++ b/ld/testsuite/ld-arm/attr-merge-4a.s
@@ -5,3 +5,6 @@
 
 	@ Tag_also_compatible_with = v6-M
 	.eabi_attribute Tag_also_compatible_with, "\006\013"
+
+	.eabi_attribute Tag_ABI_FP_number_model, 3
+	.eabi_attribute Tag_ABI_VFP_args, 3
diff --git a/ld/testsuite/ld-arm/attr-merge-4b.s b/ld/testsuite/ld-arm/attr-merge-4b.s
index d2eb6de..2cf68df 100644
--- a/ld/testsuite/ld-arm/attr-merge-4b.s
+++ b/ld/testsuite/ld-arm/attr-merge-4b.s
@@ -5,3 +5,6 @@
 
 	@ Tag_also_compatible_with = v4T
 	.eabi_attribute Tag_also_compatible_with, "\006\002"
+
+	.eabi_attribute Tag_ABI_FP_number_model, 0
+	.eabi_attribute Tag_ABI_VFP_args, 0
diff --git a/ld/testsuite/ld-arm/attr-merge-6.attr b/ld/testsuite/ld-arm/attr-merge-6.attr
index 0af32f7..1ee5d40 100644
--- a/ld/testsuite/ld-arm/attr-merge-6.attr
+++ b/ld/testsuite/ld-arm/attr-merge-6.attr
@@ -5,5 +5,6 @@ File Attributes
   Tag_CPU_arch_profile: Application
   Tag_ARM_ISA_use: Yes
   Tag_THUMB_ISA_use: Thumb-2
+  Tag_ABI_FP_number_model: IEEE 754
   Tag_MPextension_use: Allowed
   Tag_Virtualization_use: TrustZone
diff --git a/ld/testsuite/ld-arm/attr-merge-6a.s b/ld/testsuite/ld-arm/attr-merge-6a.s
index 056d8c8..0423bbf 100644
--- a/ld/testsuite/ld-arm/attr-merge-6a.s
+++ b/ld/testsuite/ld-arm/attr-merge-6a.s
@@ -1,4 +1,6 @@
 	.cpu cortex-a9
 	.fpu softvfp
+	.eabi_attribute 23, 3
+	.eabi_attribute 28, 0
 	.eabi_attribute 70, 1
 	.file	"attr-merge-6a.s"
diff --git a/ld/testsuite/ld-arm/attr-merge-6b.s b/ld/testsuite/ld-arm/attr-merge-6b.s
index b9ef4d2..9383bcc 100644
--- a/ld/testsuite/ld-arm/attr-merge-6b.s
+++ b/ld/testsuite/ld-arm/attr-merge-6b.s
@@ -1,3 +1,5 @@
 	.cpu cortex-a9
 	.fpu softvfp
+	.eabi_attribute 23, 3
+	.eabi_attribute 28, 3
 	.file	"attr-merge-6b.s"