Add support for .MIPS.abiflags and .gnu.attributes sections.

elfcpp/
	* elfcpp.h (SHT_MIPS_ABIFLAGS): New enum constant.
	* mips.h (EF_MIPS_FP64, EF_MIPS_NAN2008): New enum constants for
	processor-specific flags.
	(E_MIPS_MACH_5900): New enum constant for machine variant.
	(AFL_REG_NONE, AFL_REG_32, AFL_REG_64, AFL_REG_128): New enum
	constants.
	(AFL_ASE_DSP, AFL_ASE_DSPR2, AFL_ASE_EVA, AFL_ASE_MCU,
	AFL_ASE_MDMX, AFL_ASE_MIPS3D, AFL_ASE_MT, AFL_ASE_SMARTMIPS,
	AFL_ASE_VIRT, AFL_ASE_MSA, AFL_ASE_MIPS16, AFL_ASE_MICROMIPS,
	AFL_ASE_XPA): Likewise.
	(AFL_EXT_XLR, AFL_EXT_OCTEON2, AFL_EXT_OCTEONP,
	AFL_EXT_LOONGSON_3A, AFL_EXT_OCTEON, AFL_EXT_5900, AFL_EXT_4650,
	AFL_EXT_4010, AFL_EXT_4100, AFL_EXT_3900, AFL_EXT_10000,
	AFL_EXT_SB1, AFL_EXT_4111, AFL_EXT_4120, AFL_EXT_5400,
	AFL_EXT_5500, AFL_EXT_LOONGSON_2E, AFL_EXT_LOONGSON_2F,
	AFL_EXT_OCTEON3): Likewise.
	(Tag_GNU_MIPS_ABI_FP, Tag_GNU_MIPS_ABI_MSA): Likewise.
	(Val_GNU_MIPS_ABI_FP_ANY, Val_GNU_MIPS_ABI_FP_DOUBLE,
	Val_GNU_MIPS_ABI_FP_SINGLE, Val_GNU_MIPS_ABI_FP_SOFT,
	Val_GNU_MIPS_ABI_FP_OLD_64,Val_GNU_MIPS_ABI_FP_XX,
	Val_GNU_MIPS_ABI_FP_64, Val_GNU_MIPS_ABI_FP_64A,
	Val_GNU_MIPS_ABI_FP_NAN2008, Val_GNU_MIPS_ABI_MSA_ANY,
	Val_GNU_MIPS_ABI_MSA_128): Likewise.
	(AFL_FLAGS1_ODDSPREG): New enum constant.
gold/
	* mips.cc (struct Mips_abiflags): New struct.
	(Mips_relobj::Mips_relobj): Initialize attributes_section_data_
	and abiflags_.
	(Mips_relobj::~Mips_relobj): Delete object pointed by
	attributes_section_data_.
	(Mips_relobj::abiflags): New method.
	(Mips_relobj::attributes_section_data): Likewise.
	(Mips_relobj::attributes_section_data_): New data member.
	(Mips_relobj::abiflags_): Likewise.
	(class Mips_output_section_abiflags): New class.
	(Target_mips::Target_mips): Initialize attributes_section_data_,
	abiflags_ and has_abiflags_section_.
	(Target_mips::do_should_include_section): Don't emit input
	.MIPS.abiflags sections to output .MIPS.abiflags.
	(Target_mips::Mips_mach): Add new enum constants.
	(Target_mips::mips_isa_ext_mach): New method.
	(Target_mips::mips_isa_ext): Likewise.
	(Target_mips::update_abiflags_isa): Likewise.
	(Target_mips::infer_abiflags): Likewise.
	(Target_mips::create_abiflags): Likewise.
	(Target_mips::fp_abi_string): Likewise.
	(Target_mips::select_fp_abi): Likewise.
	(Target_mips::merge_obj_attributes): Likewise.
	(Target_mips::merge_obj_abiflags): Likewise.
	(Target_mips::level_rev): Likewise.
	(Target_mips::merge_obj_e_flags): Rename from
	merge_processor_specific_flags. Remove dyn_obj argument,
	call update_abiflags_isa when needed, compare NaN encodings and
	compare FP64 state.
	(Target_mips::add_machine_extensions): Add two machine extensions
	and fix one.
	(Target_mips::attributes_section_data_): New data member.
	(Target_mips::abiflags_): Likewise.
	(Target_mips::has_abiflags_section_): Likewise.
	(Mips_relobj::do_read_symbols): Read .gnu.attributes and
	.MIPS.abiflags sections if they exists.
	(Target_mips::elf_mips_mach): Add E_MIPS_MACH_5900 and
	E_MIPS_MACH_OCTEON3 support.
	(Target_mips::do_adjust_elf_header): Setup EI_ABIVERSION flag.
	(Target_mips::do_finalize_sections): Merge .gnu.attributes and
	.MIPS.abiflags sections from input. Create these sections if
	needed.
	(Target_mips::elf_mips_mach_name): Add E_MIPS_MACH_5900 and
	E_MIPS_MACH_OCTEON3 support, and change strings for
	E_MIPS_MACH_LS2E, E_MIPS_MACH_LS2F and E_MIPS_MACH_LS3A just
	to match bfd.

3 files changed, 169 insertions, 0 deletions

diff --git a/elfcpp/ChangeLog b/elfcpp/ChangeLog
index a469f86eec7..93b2189492d 100644
--- a/elfcpp/ChangeLog
+++ b/elfcpp/ChangeLog
@@ -1,3 +1,30 @@
+2016-06-10  Vladimir Radosavljevic  <Vladimir.Radosavljevic@imgtec.com>
+
+	* elfcpp.h (SHT_MIPS_ABIFLAGS): New enum constant.
+	* mips.h (EF_MIPS_FP64, EF_MIPS_NAN2008): New enum constants for
+	processor-specific flags.
+	(E_MIPS_MACH_5900): New enum constant for machine variant.
+	(AFL_REG_NONE, AFL_REG_32, AFL_REG_64, AFL_REG_128): New enum
+	constants.
+	(AFL_ASE_DSP, AFL_ASE_DSPR2, AFL_ASE_EVA, AFL_ASE_MCU,
+	AFL_ASE_MDMX, AFL_ASE_MIPS3D, AFL_ASE_MT, AFL_ASE_SMARTMIPS,
+	AFL_ASE_VIRT, AFL_ASE_MSA, AFL_ASE_MIPS16, AFL_ASE_MICROMIPS,
+	AFL_ASE_XPA): Likewise.
+	(AFL_EXT_XLR, AFL_EXT_OCTEON2, AFL_EXT_OCTEONP,
+	AFL_EXT_LOONGSON_3A, AFL_EXT_OCTEON, AFL_EXT_5900, AFL_EXT_4650,
+	AFL_EXT_4010, AFL_EXT_4100, AFL_EXT_3900, AFL_EXT_10000,
+	AFL_EXT_SB1, AFL_EXT_4111, AFL_EXT_4120, AFL_EXT_5400,
+	AFL_EXT_5500, AFL_EXT_LOONGSON_2E, AFL_EXT_LOONGSON_2F,
+	AFL_EXT_OCTEON3): Likewise.
+	(Tag_GNU_MIPS_ABI_FP, Tag_GNU_MIPS_ABI_MSA): Likewise.
+	(Val_GNU_MIPS_ABI_FP_ANY, Val_GNU_MIPS_ABI_FP_DOUBLE,
+	Val_GNU_MIPS_ABI_FP_SINGLE, Val_GNU_MIPS_ABI_FP_SOFT,
+	Val_GNU_MIPS_ABI_FP_OLD_64,Val_GNU_MIPS_ABI_FP_XX,
+	Val_GNU_MIPS_ABI_FP_64, Val_GNU_MIPS_ABI_FP_64A,
+	Val_GNU_MIPS_ABI_FP_NAN2008, Val_GNU_MIPS_ABI_MSA_ANY,
+	Val_GNU_MIPS_ABI_MSA_128): Likewise.
+	(AFL_FLAGS1_ODDSPREG): New enum constant.
+
 2016-03-18  Vladimir Radosavljevic  <vladimir.radosavljevic@imgtec.com>
 
 	* mips.h (abi_64): Remove.
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index 3d7039a33bd..f39a135ab37 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -406,6 +406,8 @@ enum SHT
   SHT_MIPS_REGINFO = 0x70000006,
   // Section contains miscellaneous options.
   SHT_MIPS_OPTIONS = 0x7000000d,
+  // ABI related flags section.
+  SHT_MIPS_ABIFLAGS = 0x7000002a,
 
   // AARCH64-specific section type.
   SHT_AARCH64_ATTRIBUTES = 0x70000003,
diff --git a/elfcpp/mips.h b/elfcpp/mips.h
index 10137ec22d6..a7a9799af11 100644
--- a/elfcpp/mips.h
+++ b/elfcpp/mips.h
@@ -193,6 +193,10 @@ enum
   // Indicates code compiled for a 64-bit machine in 32-bit mode.
   // (regs are 32-bits wide.)
   EF_MIPS_32BITMODE = 0x00000100,
+  // 32-bit machine but FP registers are 64 bit (-mfp64).
+  EF_MIPS_FP64 = 0x00000200,
+  /// Code in file uses the IEEE 754-2008 NaN encoding convention.
+  EF_MIPS_NAN2008 = 0x00000400,
   // MIPS dynamic
   EF_MIPS_DYNAMIC = 0x40
 };
@@ -220,6 +224,7 @@ enum
   E_MIPS_MACH_OCTEON2 = 0x008d0000,
   E_MIPS_MACH_OCTEON3 = 0x008e0000,
   E_MIPS_MACH_5400 = 0x00910000,
+  E_MIPS_MACH_5900 = 0x00920000,
   E_MIPS_MACH_5500 = 0x00980000,
   E_MIPS_MACH_9000 = 0x00990000,
   E_MIPS_MACH_LS2E = 0x00A00000,
@@ -256,6 +261,141 @@ enum
   E_MIPS_ARCH_64R6 = 0xa0000000,
 };
 
+// Values for the xxx_size bytes of an ABI flags structure.
+enum
+{
+  // No registers.
+  AFL_REG_NONE = 0x00,
+  // 32-bit registers.
+  AFL_REG_32 = 0x01,
+  // 64-bit registers.
+  AFL_REG_64 = 0x02,
+  // 128-bit registers.
+  AFL_REG_128 = 0x03
+};
+
+// Masks for the ases word of an ABI flags structure.
+enum
+{
+  // DSP ASE.
+  AFL_ASE_DSP = 0x00000001,
+  // DSP R2 ASE.
+  AFL_ASE_DSPR2 = 0x00000002,
+  // Enhanced VA Scheme.
+  AFL_ASE_EVA = 0x00000004,
+  // MCU (MicroController) ASE.
+  AFL_ASE_MCU = 0x00000008,
+  // MDMX ASE.
+  AFL_ASE_MDMX = 0x00000010,
+  // MIPS-3D ASE.
+  AFL_ASE_MIPS3D = 0x00000020,
+  // MT ASE.
+  AFL_ASE_MT  = 0x00000040,
+  // SmartMIPS ASE.
+  AFL_ASE_SMARTMIPS = 0x00000080,
+  // VZ ASE.
+  AFL_ASE_VIRT = 0x00000100,
+  // MSA ASE.
+  AFL_ASE_MSA = 0x00000200,
+  // MIPS16 ASE.
+  AFL_ASE_MIPS16 = 0x00000400,
+  // MICROMIPS ASE.
+  AFL_ASE_MICROMIPS = 0x00000800,
+  // XPA ASE.
+  AFL_ASE_XPA = 0x00001000
+};
+
+// Values for the isa_ext word of an ABI flags structure.
+enum
+{
+  // RMI Xlr instruction.
+  AFL_EXT_XLR = 1,
+  // Cavium Networks Octeon2.
+  AFL_EXT_OCTEON2 = 2,
+  // Cavium Networks OcteonP.
+  AFL_EXT_OCTEONP = 3,
+  // Loongson 3A.
+  AFL_EXT_LOONGSON_3A = 4,
+  // Cavium Networks Octeon.
+  AFL_EXT_OCTEON = 5,
+  // MIPS R5900 instruction.
+  AFL_EXT_5900 = 6,
+  // MIPS R4650 instruction.
+  AFL_EXT_4650 = 7,
+  // LSI R4010 instruction.
+  AFL_EXT_4010 = 8,
+  // NEC VR4100 instruction.
+  AFL_EXT_4100 = 9,
+  // Toshiba R3900 instruction.
+  AFL_EXT_3900 = 10,
+  // MIPS R10000 instruction.
+  AFL_EXT_10000 = 11,
+  // Broadcom SB-1 instruction.
+  AFL_EXT_SB1 = 12,
+  // NEC VR4111/VR4181 instruction.
+  AFL_EXT_4111 = 13,
+  // NEC VR4120 instruction.
+  AFL_EXT_4120 = 14,
+  // NEC VR5400 instruction.
+  AFL_EXT_5400 = 15,
+  // NEC VR5500 instruction.
+  AFL_EXT_5500 = 16,
+  // ST Microelectronics Loongson 2E.
+  AFL_EXT_LOONGSON_2E = 17,
+  // ST Microelectronics Loongson 2F.
+  AFL_EXT_LOONGSON_2F = 18,
+  // Cavium Networks Octeon3.
+  AFL_EXT_OCTEON3 = 19
+};
+
+// Masks for the flags1 word of an ABI flags structure.
+enum
+{
+  // Uses odd single-precision registers.
+  AFL_FLAGS1_ODDSPREG = 1
+};
+
+// Object attribute tags.
+enum
+{
+  // 0-3 are generic.
+  // Floating-point ABI used by this object file.
+  Tag_GNU_MIPS_ABI_FP = 4,
+  // MSA ABI used by this object file.
+  Tag_GNU_MIPS_ABI_MSA = 8
+};
+
+// Object attribute values.
+enum
+{
+  // Values defined for Tag_GNU_MIPS_ABI_FP.
+  // Not tagged or not using any ABIs affected by the differences.
+  Val_GNU_MIPS_ABI_FP_ANY = 0,
+  // Using hard-float -mdouble-float.
+  Val_GNU_MIPS_ABI_FP_DOUBLE = 1,
+  // Using hard-float -msingle-float.
+  Val_GNU_MIPS_ABI_FP_SINGLE = 2,
+  // Using soft-float.
+  Val_GNU_MIPS_ABI_FP_SOFT = 3,
+  // Using -mips32r2 -mfp64.
+  Val_GNU_MIPS_ABI_FP_OLD_64 = 4,
+  // Using -mfpxx
+  Val_GNU_MIPS_ABI_FP_XX = 5,
+  // Using -mips32r2 -mfp64.
+  Val_GNU_MIPS_ABI_FP_64 = 6,
+  // Using -mips32r2 -mfp64 -mno-odd-spreg.
+  Val_GNU_MIPS_ABI_FP_64A = 7,
+  // This is reserved for backward-compatibility with an earlier
+  // implementation of the MIPS NaN2008 functionality.
+  Val_GNU_MIPS_ABI_FP_NAN2008 = 8,
+
+  // Values defined for Tag_GNU_MIPS_ABI_MSA.
+  // Not tagged or not using any ABIs affected by the differences.
+  Val_GNU_MIPS_ABI_MSA_ANY = 0,
+  // Using 128-bit MSA.
+  Val_GNU_MIPS_ABI_MSA_128 = 1
+};
+
 enum
 {
   // Mask to extract ABI version, not really a flag value.