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[PATCH 4/7] RISC-V Binutils Port

From: Palmer Dabbelt <palmer at dabbelt dot com>
To: Andrew Waterman <andrew at sifive dot com>
To: binutils at sourceware dot org
To: nickc at redhat dot com
Cc: Palmer Dabbelt <palmer at dabbelt dot com>
Date: Sat, 22 Oct 2016 16:30:34 -0700
Subject: [PATCH 4/7] RISC-V Binutils Port
Authentication-results: sourceware.org; auth=none
References: <1477179037-32066-1-git-send-email-palmer@dabbelt.com>

---
 binutils/readelf.c  | 20 +++++++++++-
 include/elf/riscv.h | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 111 insertions(+), 1 deletion(-)
 create mode 100644 include/elf/riscv.h

diff --git a/binutils/readelf.c b/binutils/readelf.c
index 69942cf..114486c 100644
--- a/binutils/readelf.c
+++ b/binutils/readelf.c
@@ -124,6 +124,7 @@
 #include "elf/metag.h"
 #include "elf/microblaze.h"
 #include "elf/mips.h"
+#include "elf/riscv.h"
 #include "elf/mmix.h"
 #include "elf/mn10200.h"
 #include "elf/mn10300.h"
@@ -775,6 +776,7 @@ guess_is_rela (unsigned int e_machine)
     case EM_OR1K:
     case EM_PPC64:
     case EM_PPC:
+    case EM_RISCV:
     case EM_RL78:
     case EM_RX:
     case EM_S390:
@@ -1314,6 +1316,10 @@ dump_relocations (FILE * file,
 	  rtype = elf_mips_reloc_type (type);
 	  break;
 
+	case EM_RISCV:
+	  rtype = elf_riscv_reloc_type (type);
+	  break;
+
 	case EM_ALPHA:
 	  rtype = elf_alpha_reloc_type (type);
 	  break;
@@ -2327,6 +2333,7 @@ get_machine_name (unsigned e_machine)
     case EM_CR16:
     case EM_MICROBLAZE:
     case EM_MICROBLAZE_OLD:	return "Xilinx MicroBlaze";
+    case EM_RISCV:		return "RISC-V";
     case EM_RL78:		return "Renesas RL78";
     case EM_RX:			return "Renesas RX";
     case EM_METAG:		return "Imagination Technologies Meta processor architecture";
@@ -2363,7 +2370,6 @@ get_machine_name (unsigned e_machine)
     case EM_CSR_KALIMBA:	return "CSR Kalimba architecture family";
     case EM_Z80:		return "Zilog Z80";
     case EM_AMDGPU:		return "AMD GPU architecture";
-    case EM_RISCV:		return "RISC-V";
     default:
       snprintf (buff, sizeof (buff), _("<unknown>: 0x%x"), e_machine);
       return buff;
@@ -3308,6 +3314,13 @@ get_machine_flags (unsigned e_flags, unsigned e_machine)
 	  decode_NDS32_machine_flags (e_flags, buf, sizeof buf);
 	  break;
 
+	case EM_RISCV:
+	  if (e_flags & EF_RISCV_RVC)
+	    strcat (buf, ", RVC");
+	  if (e_flags & EF_RISCV_SOFT_FLOAT)
+	    strcat (buf, ", soft-float ABI");
+	  break;
+
 	case EM_SH:
 	  switch ((e_flags & EF_SH_MACH_MASK))
 	    {
@@ -11788,6 +11801,8 @@ is_32bit_abs_reloc (unsigned int reloc_type)
       return reloc_type == 1; /* R_PPC64_ADDR32.  */
     case EM_PPC:
       return reloc_type == 1; /* R_PPC_ADDR32.  */
+    case EM_RISCV:
+      return reloc_type == 1; /* R_RISCV_32.  */
     case EM_RL78:
       return reloc_type == 1; /* R_RL78_DIR32.  */
     case EM_RX:
@@ -11941,6 +11956,8 @@ is_64bit_abs_reloc (unsigned int reloc_type)
       return reloc_type == 80; /* R_PARISC_DIR64.  */
     case EM_PPC64:
       return reloc_type == 38; /* R_PPC64_ADDR64.  */
+    case EM_RISCV:
+      return reloc_type == 2; /* R_RISCV_64.  */
     case EM_SPARC32PLUS:
     case EM_SPARCV9:
     case EM_SPARC:
@@ -12112,6 +12129,7 @@ is_none_reloc (unsigned int reloc_type)
     case EM_PARISC:  /* R_PARISC_NONE.  */
     case EM_PPC64:   /* R_PPC64_NONE.  */
     case EM_PPC:     /* R_PPC_NONE.  */
+    case EM_RISCV:   /* R_RISCV_NONE.  */
     case EM_S390:    /* R_390_NONE.  */
     case EM_S390_OLD:
     case EM_SH:      /* R_SH_NONE.  */
diff --git a/include/elf/riscv.h b/include/elf/riscv.h
new file mode 100644
index 0000000..d842876
--- /dev/null
+++ b/include/elf/riscv.h
@@ -0,0 +1,92 @@
+/* RISC-V ELF support for BFD.
+   Copyright 2011-2015 Free Software Foundation, Inc.
+
+   Contributed by Andrew Waterman (andrew@sifive.com).
+   Based on MIPS ELF support for BFD, by Ian Lance Taylor.
+
+   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/>.  */
+
+/* This file holds definitions specific to the RISCV ELF ABI.  Note
+   that most of this is not actually implemented by BFD.  */
+
+#ifndef _ELF_RISCV_H
+#define _ELF_RISCV_H
+
+#include "elf/reloc-macros.h"
+#include "libiberty.h"
+
+/* Relocation types.  */
+START_RELOC_NUMBERS (elf_riscv_reloc_type)
+  /* Relocation types used by the dynamic linker.  */
+  RELOC_NUMBER (R_RISCV_NONE, 0)
+  RELOC_NUMBER (R_RISCV_32, 1)
+  RELOC_NUMBER (R_RISCV_64, 2)
+  RELOC_NUMBER (R_RISCV_RELATIVE, 3)
+  RELOC_NUMBER (R_RISCV_COPY, 4)
+  RELOC_NUMBER (R_RISCV_JUMP_SLOT, 5)
+  RELOC_NUMBER (R_RISCV_TLS_DTPMOD32, 6)
+  RELOC_NUMBER (R_RISCV_TLS_DTPMOD64, 7)
+  RELOC_NUMBER (R_RISCV_TLS_DTPREL32, 8)
+  RELOC_NUMBER (R_RISCV_TLS_DTPREL64, 9)
+  RELOC_NUMBER (R_RISCV_TLS_TPREL32, 10)
+  RELOC_NUMBER (R_RISCV_TLS_TPREL64, 11)
+
+  /* Relocation types not used by the dynamic linker.  */
+  RELOC_NUMBER (R_RISCV_BRANCH, 16)
+  RELOC_NUMBER (R_RISCV_JAL, 17)
+  RELOC_NUMBER (R_RISCV_CALL, 18)
+  RELOC_NUMBER (R_RISCV_CALL_PLT, 19)
+  RELOC_NUMBER (R_RISCV_GOT_HI20, 20)
+  RELOC_NUMBER (R_RISCV_TLS_GOT_HI20, 21)
+  RELOC_NUMBER (R_RISCV_TLS_GD_HI20, 22)
+  RELOC_NUMBER (R_RISCV_PCREL_HI20, 23)
+  RELOC_NUMBER (R_RISCV_PCREL_LO12_I, 24)
+  RELOC_NUMBER (R_RISCV_PCREL_LO12_S, 25)
+  RELOC_NUMBER (R_RISCV_HI20, 26)
+  RELOC_NUMBER (R_RISCV_LO12_I, 27)
+  RELOC_NUMBER (R_RISCV_LO12_S, 28)
+  RELOC_NUMBER (R_RISCV_TPREL_HI20, 29)
+  RELOC_NUMBER (R_RISCV_TPREL_LO12_I, 30)
+  RELOC_NUMBER (R_RISCV_TPREL_LO12_S, 31)
+  RELOC_NUMBER (R_RISCV_TPREL_ADD, 32)
+  RELOC_NUMBER (R_RISCV_ADD8, 33)
+  RELOC_NUMBER (R_RISCV_ADD16, 34)
+  RELOC_NUMBER (R_RISCV_ADD32, 35)
+  RELOC_NUMBER (R_RISCV_ADD64, 36)
+  RELOC_NUMBER (R_RISCV_SUB8, 37)
+  RELOC_NUMBER (R_RISCV_SUB16, 38)
+  RELOC_NUMBER (R_RISCV_SUB32, 39)
+  RELOC_NUMBER (R_RISCV_SUB64, 40)
+  RELOC_NUMBER (R_RISCV_GNU_VTINHERIT, 41)
+  RELOC_NUMBER (R_RISCV_GNU_VTENTRY, 42)
+  RELOC_NUMBER (R_RISCV_ALIGN, 43)
+  RELOC_NUMBER (R_RISCV_RVC_BRANCH, 44)
+  RELOC_NUMBER (R_RISCV_RVC_JUMP, 45)
+  RELOC_NUMBER (R_RISCV_RVC_LUI, 46)
+  RELOC_NUMBER (R_RISCV_GPREL_I, 47)
+  RELOC_NUMBER (R_RISCV_GPREL_S, 48)
+END_RELOC_NUMBERS (R_RISCV_max)
+
+/* Processor specific flags for the ELF header e_flags field.  */
+
+/* File may contain compressed instructions.  */
+#define EF_RISCV_RVC 0x0001
+
+/* File uses the soft-float calling convention.  */
+#define EF_RISCV_SOFT_FLOAT 0x0002
+
+#endif /* _ELF_RISCV_H */
-- 
2.7.3

References:
- Binutils/gas/ld port for RISC-V [PATCH v2]
  - From: Palmer Dabbelt

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