Add support for RISC-V architecture.

bfd	* Makefile.am: Add entries for riscv32-elf and riscv64-elf.
	* config.bdf: Likewise.
	* configure.ac: Likewise.
	* Makefile.in: Regenerate.
	* configure: Regenerate.
	* archures.c: Add bfd_riscv_arch.
	* reloc.c: Add riscv relocs.
	* targets.c: Add riscv_elf32_vec and riscv_elf64_vec.
	* bfd-in2.h: Regenerate.
	* libbfd.h: Regenerate.
	* elf-bfd.h: Add RISCV_ELF_DATA to enum elf_target_id.
	* elfnn-riscv.c: New file.
	* elfxx-riscv.c: New file.
	* elfxx-riscv.h: New file.

binutils* readelf.c (guess_is_rela): Add EM_RISCV.
	(get_machine_name): Likewise.
	(dump_relocations): Add support for riscv relocations.
	(get_machine_flags): Add support for riscv flags.
	(is_32bit_abs_reloc): Add R_RISCV_32.
	(is_64bit_abs_reloc): Add R_RISCV_64.
	(is_none_reloc): Add R_RISCV_NONE.
	* testsuite/binutils-all/objdump.exp (cpus_expected): Add riscv.
	Expect the debug_ranges test to fail.

gas	* Makefile.am: Add riscv files.
	* Makefile.in: Regenerate.
	* NEWS: Mention the support for this architecture.
	* configure.in: Define a default architecture.
	* configure: Regenerate.
	* configure.tgt: Add entries for riscv.
	* doc/as.texinfo: Likewise.
	* testsuite/gas/all/gas.exp: Expect the redef tests to fail.
	* testsuite/gas/elf/elf.exp: Expect the groupauto tests to fail.
	* config/tc-riscv.c: New file.
	* config/tc-riscv.h: New file.
	* doc/c-riscv.texi: New file.
	* testsuite/gas/riscv: New directory.
	* testsuite/gas/riscv/riscv.exp: New file.
	* testsuite/gas/riscv/t_insns.d: New file.
	* testsuite/gas/riscv/t_insns.s: New file.

ld	* Makefile.am: Add riscv files.
	* Makefile.in: Regenerate.
	* NEWS: Mention the support for this target.
	* configure.tgt: Add riscv entries.
	* emulparams/elf32lriscv-defs.sh: New file.
	* emulparams/elf32lriscv.sh: New file.
	* emulparams/elf64lriscv-defs.sh: New file.
	* emulparams/elf64lriscv.sh: New file.
	* emultempl/riscvelf.em: New file.

opcodes	* configure.ac: Add entry for bfd_riscv_arch.
	* configure: Regenerate.
	* disassemble.c (disassembler): Add support for riscv.
	(disassembler_usage): Likewise.
	* riscv-dis.c: New file.
	* riscv-opc.c: New file.

include	* dis-asm.h: Add prototypes for print_insn_riscv and
	print_riscv_disassembler_options.
	* elf/riscv.h: New file.
	* opcode/riscv-opc.h: New file.
	* opcode/riscv.h: New file.

1 files changed, 815 insertions, 0 deletions

diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
new file mode 100644
index 0000000..bd68fe4
--- /dev/null
+++ b/bfd/elfxx-riscv.c
@@ -0,0 +1,815 @@
+/* RISC-V-specific support for ELF.
+   Copyright 2011-2016 Free Software Foundation, Inc.
+
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   Based on TILE-Gx and MIPS targets.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "sysdep.h"
+#include "bfd.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/riscv.h"
+#include "opcode/riscv.h"
+#include "libiberty.h"
+#include "elfxx-riscv.h"
+#include <stdint.h>
+
+#define MINUS_ONE ((bfd_vma)0 - 1)
+
+/* The relocation table used for SHT_RELA sections.  */
+
+static reloc_howto_type howto_table[] =
+{
+  /* No relocation.  */
+  HOWTO (R_RISCV_NONE,			/* type */
+	 0,				/* rightshift */
+	 3,				/* size */
+	 0,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_NONE",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0,				/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 32 bit relocation.  */
+  HOWTO (R_RISCV_32,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_32",			/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0xffffffff,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 64 bit relocation.  */
+  HOWTO (R_RISCV_64,			/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_64",			/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Relocation against a local symbol in a shared object.  */
+  HOWTO (R_RISCV_RELATIVE,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_RELATIVE",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0xffffffff,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_COPY,			/* type */
+	 0,				/* rightshift */
+	 0,				/* this one is variable size */
+	 0,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_COPY",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0x0,         			/* src_mask */
+	 0x0,		        	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_JUMP_SLOT,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_JUMP_SLOT",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0x0,         			/* src_mask */
+	 0x0,		        	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Dynamic TLS relocations.  */
+  HOWTO (R_RISCV_TLS_DTPMOD32,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_DTPMOD32",	/* name */
+	 FALSE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_TLS_DTPMOD64,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_DTPMOD64",	/* name */
+	 FALSE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_TLS_DTPREL32,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_DTPREL32",	/* name */
+	 TRUE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_TLS_DTPREL64,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_DTPREL64",	/* name */
+	 TRUE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_TLS_TPREL32,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_TPREL32",		/* name */
+	 FALSE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  HOWTO (R_RISCV_TLS_TPREL64,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc, 	/* special_function */
+	 "R_RISCV_TLS_TPREL64",		/* name */
+	 FALSE,				/* partial_inplace */
+	 MINUS_ONE,			/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Reserved for future relocs that the dynamic linker must understand.  */
+  EMPTY_HOWTO (12),
+  EMPTY_HOWTO (13),
+  EMPTY_HOWTO (14),
+  EMPTY_HOWTO (15),
+
+  /* 12-bit PC-relative branch offset.  */
+  HOWTO (R_RISCV_BRANCH,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_signed,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_BRANCH",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_SBTYPE_IMM (-1U),	/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* 20-bit PC-relative jump offset.  */
+  HOWTO (R_RISCV_JAL,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+					/* This needs complex overflow
+					   detection, because the upper 36
+					   bits must match the PC + 4.  */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_JAL",			/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UJTYPE_IMM (-1U),	/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* 32-bit PC-relative function call (AUIPC/JALR).  */
+  HOWTO (R_RISCV_CALL,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 64,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_CALL",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
+					/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* 32-bit PC-relative function call (AUIPC/JALR).  */
+  HOWTO (R_RISCV_CALL_PLT,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 64,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_CALL_PLT",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U) | ((bfd_vma) ENCODE_ITYPE_IMM (-1U) << 32),
+					/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* High 20 bits of 32-bit PC-relative GOT access.  */
+  HOWTO (R_RISCV_GOT_HI20,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_GOT_HI20",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 20 bits of 32-bit PC-relative TLS IE GOT access.  */
+  HOWTO (R_RISCV_TLS_GOT_HI20,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TLS_GOT_HI20",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 20 bits of 32-bit PC-relative TLS GD GOT reference.  */
+  HOWTO (R_RISCV_TLS_GD_HI20,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TLS_GD_HI20",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 20 bits of 32-bit PC-relative reference.  */
+  HOWTO (R_RISCV_PCREL_HI20,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_PCREL_HI20",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* Low 12 bits of a 32-bit PC-relative load or add.  */
+  HOWTO (R_RISCV_PCREL_LO12_I,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_PCREL_LO12_I",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_ITYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Low 12 bits of a 32-bit PC-relative store.  */
+  HOWTO (R_RISCV_PCREL_LO12_S,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_PCREL_LO12_S",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_STYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 20 bits of 32-bit absolute address.  */
+  HOWTO (R_RISCV_HI20,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_HI20",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 12 bits of 32-bit load or add.  */
+  HOWTO (R_RISCV_LO12_I,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_LO12_I",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_ITYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 12 bits of 32-bit store.  */
+  HOWTO (R_RISCV_LO12_S,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_LO12_S",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_STYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 20 bits of TLS LE thread pointer offset.  */
+  HOWTO (R_RISCV_TPREL_HI20,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_signed,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TPREL_HI20",		/* name */
+	 TRUE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_UTYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Low 12 bits of TLS LE thread pointer offset for loads and adds.  */
+  HOWTO (R_RISCV_TPREL_LO12_I,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_signed,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TPREL_LO12_I",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_ITYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Low 12 bits of TLS LE thread pointer offset for stores.  */
+  HOWTO (R_RISCV_TPREL_LO12_S,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_signed,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TPREL_LO12_S",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_STYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* TLS LE thread pointer usage.  */
+  HOWTO (R_RISCV_TPREL_ADD,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_TPREL_ADD",		/* name */
+	 TRUE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0,				/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 8-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_ADD8,			/* type */
+	 0,				/* rightshift */
+	 0,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_ADD8",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 16-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_ADD16,			/* type */
+	 0,				/* rightshift */
+	 1,				/* size */
+	 16,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_ADD16",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 32-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_ADD32,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_ADD32",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 64-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_ADD64,			/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_ADD64",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 8-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_SUB8,			/* type */
+	 0,				/* rightshift */
+	 0,				/* size */
+	 8,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_SUB8",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 16-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_SUB16,			/* type */
+	 0,				/* rightshift */
+	 1,				/* size */
+	 16,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_SUB16",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 32-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_SUB32,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_SUB32",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* 64-bit in-place addition, for local label subtraction.  */
+  HOWTO (R_RISCV_SUB64,			/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 64,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_SUB64",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 MINUS_ONE,			/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* GNU extension to record C++ vtable hierarchy */
+  HOWTO (R_RISCV_GNU_VTINHERIT,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 0,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 NULL,				/* special_function */
+	 "R_RISCV_GNU_VTINHERIT",	/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0,				/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* GNU extension to record C++ vtable member usage */
+  HOWTO (R_RISCV_GNU_VTENTRY,		/* type */
+	 0,				/* rightshift */
+	 4,				/* size */
+	 0,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 _bfd_elf_rel_vtable_reloc_fn,	/* special_function */
+	 "R_RISCV_GNU_VTENTRY",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0,				/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* Indicates an alignment statement.  The addend field encodes how many
+     bytes of NOPs follow the statement.  The desired alignment is the
+     addend rounded up to the next power of two.  */
+  HOWTO (R_RISCV_ALIGN,			/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 0,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_ALIGN",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 0,				/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* 8-bit PC-relative branch offset.  */
+  HOWTO (R_RISCV_RVC_BRANCH,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_signed,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_RVC_BRANCH",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_RVC_B_IMM (-1U),	/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* 11-bit PC-relative jump offset.  */
+  HOWTO (R_RISCV_RVC_JUMP,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 TRUE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+					/* This needs complex overflow
+					   detection, because the upper 36
+					   bits must match the PC + 4.  */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_RVC_JUMP",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_RVC_J_IMM (-1U),	/* dst_mask */
+	 TRUE),				/* pcrel_offset */
+
+  /* High 6 bits of 18-bit absolute address.  */
+  HOWTO (R_RISCV_RVC_LUI,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_RVC_LUI",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_RVC_IMM (-1U),		/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 12 bits of 32-bit load or add.  */
+  HOWTO (R_RISCV_GPREL_I,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_GPREL_I",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_ITYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+
+  /* High 12 bits of 32-bit store.  */
+  HOWTO (R_RISCV_GPREL_S,		/* type */
+	 0,				/* rightshift */
+	 2,				/* size */
+	 32,				/* bitsize */
+	 FALSE,				/* pc_relative */
+	 0,				/* bitpos */
+	 complain_overflow_dont,	/* complain_on_overflow */
+	 bfd_elf_generic_reloc,		/* special_function */
+	 "R_RISCV_GPREL_S",		/* name */
+	 FALSE,				/* partial_inplace */
+	 0,				/* src_mask */
+	 ENCODE_STYPE_IMM (-1U),	/* dst_mask */
+	 FALSE),			/* pcrel_offset */
+};
+
+/* A mapping from BFD reloc types to RISC-V ELF reloc types.  */
+
+struct elf_reloc_map
+{
+  bfd_reloc_code_real_type bfd_val;
+  enum elf_riscv_reloc_type elf_val;
+};
+
+static const struct elf_reloc_map riscv_reloc_map[] =
+{
+  { BFD_RELOC_NONE, R_RISCV_NONE },
+  { BFD_RELOC_32, R_RISCV_32 },
+  { BFD_RELOC_64, R_RISCV_64 },
+  { BFD_RELOC_RISCV_ADD8, R_RISCV_ADD8 },
+  { BFD_RELOC_RISCV_ADD16, R_RISCV_ADD16 },
+  { BFD_RELOC_RISCV_ADD32, R_RISCV_ADD32 },
+  { BFD_RELOC_RISCV_ADD64, R_RISCV_ADD64 },
+  { BFD_RELOC_RISCV_SUB8, R_RISCV_SUB8 },
+  { BFD_RELOC_RISCV_SUB16, R_RISCV_SUB16 },
+  { BFD_RELOC_RISCV_SUB32, R_RISCV_SUB32 },
+  { BFD_RELOC_RISCV_SUB64, R_RISCV_SUB64 },
+  { BFD_RELOC_CTOR, R_RISCV_64 },
+  { BFD_RELOC_12_PCREL, R_RISCV_BRANCH },
+  { BFD_RELOC_RISCV_HI20, R_RISCV_HI20 },
+  { BFD_RELOC_RISCV_LO12_I, R_RISCV_LO12_I },
+  { BFD_RELOC_RISCV_LO12_S, R_RISCV_LO12_S },
+  { BFD_RELOC_RISCV_PCREL_LO12_I, R_RISCV_PCREL_LO12_I },
+  { BFD_RELOC_RISCV_PCREL_LO12_S, R_RISCV_PCREL_LO12_S },
+  { BFD_RELOC_RISCV_CALL, R_RISCV_CALL },
+  { BFD_RELOC_RISCV_CALL_PLT, R_RISCV_CALL_PLT },
+  { BFD_RELOC_RISCV_PCREL_HI20, R_RISCV_PCREL_HI20 },
+  { BFD_RELOC_RISCV_JMP, R_RISCV_JAL },
+  { BFD_RELOC_RISCV_GOT_HI20, R_RISCV_GOT_HI20 },
+  { BFD_RELOC_RISCV_TLS_DTPMOD32, R_RISCV_TLS_DTPMOD32 },
+  { BFD_RELOC_RISCV_TLS_DTPREL32, R_RISCV_TLS_DTPREL32 },
+  { BFD_RELOC_RISCV_TLS_DTPMOD64, R_RISCV_TLS_DTPMOD64 },
+  { BFD_RELOC_RISCV_TLS_DTPREL64, R_RISCV_TLS_DTPREL64 },
+  { BFD_RELOC_RISCV_TLS_TPREL32, R_RISCV_TLS_TPREL32 },
+  { BFD_RELOC_RISCV_TLS_TPREL64, R_RISCV_TLS_TPREL64 },
+  { BFD_RELOC_RISCV_TPREL_HI20, R_RISCV_TPREL_HI20 },
+  { BFD_RELOC_RISCV_TPREL_ADD, R_RISCV_TPREL_ADD },
+  { BFD_RELOC_RISCV_TPREL_LO12_S, R_RISCV_TPREL_LO12_S },
+  { BFD_RELOC_RISCV_TPREL_LO12_I, R_RISCV_TPREL_LO12_I },
+  { BFD_RELOC_RISCV_TLS_GOT_HI20, R_RISCV_TLS_GOT_HI20 },
+  { BFD_RELOC_RISCV_TLS_GD_HI20, R_RISCV_TLS_GD_HI20 },
+  { BFD_RELOC_RISCV_ALIGN, R_RISCV_ALIGN },
+  { BFD_RELOC_RISCV_RVC_BRANCH, R_RISCV_RVC_BRANCH },
+  { BFD_RELOC_RISCV_RVC_JUMP, R_RISCV_RVC_JUMP },
+  { BFD_RELOC_RISCV_RVC_LUI, R_RISCV_RVC_LUI },
+  { BFD_RELOC_RISCV_GPREL_I, R_RISCV_GPREL_I },
+  { BFD_RELOC_RISCV_GPREL_S, R_RISCV_GPREL_S },
+};
+
+/* Given a BFD reloc type, return a howto structure.  */
+
+reloc_howto_type *
+riscv_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+			 bfd_reloc_code_real_type code)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (riscv_reloc_map); i++)
+    if (riscv_reloc_map[i].bfd_val == code)
+      return &howto_table[(int) riscv_reloc_map[i].elf_val];
+
+  bfd_set_error (bfd_error_bad_value);
+  return NULL;
+}
+
+reloc_howto_type *
+riscv_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
+{
+  unsigned int i;
+
+  for (i = 0; i < ARRAY_SIZE (howto_table); i++)
+    if (howto_table[i].name && strcasecmp (howto_table[i].name, r_name) == 0)
+      return &howto_table[i];
+
+  return NULL;
+}
+
+reloc_howto_type *
+riscv_elf_rtype_to_howto (unsigned int r_type)
+{
+  if (r_type >= ARRAY_SIZE (howto_table))
+    {
+      (*_bfd_error_handler) (_("unrecognized relocation (0x%x)"), r_type);
+      bfd_set_error (bfd_error_bad_value);
+      return NULL;
+    }
+  return &howto_table[r_type];
+}