[PATCH 5/6] RISC-V ld port

[Andrew Waterman <palmer at dabbelt dot com>]

---
 ld/emulparams/elf32lriscv-defs.sh | 42 ++++++++++++++++++++++++
 ld/emulparams/elf32lriscv.sh      |  2 ++
 ld/emulparams/elf64lriscv-defs.sh | 13 ++++++++
 ld/emulparams/elf64lriscv.sh      |  2 ++
 ld/emultempl/riscvelf.em          | 68 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 127 insertions(+)
 create mode 100644 ld/emulparams/elf32lriscv-defs.sh
 create mode 100644 ld/emulparams/elf32lriscv.sh
 create mode 100644 ld/emulparams/elf64lriscv-defs.sh
 create mode 100644 ld/emulparams/elf64lriscv.sh
 create mode 100644 ld/emultempl/riscvelf.em

diff --git a/ld/emulparams/elf32lriscv-defs.sh b/ld/emulparams/elf32lriscv-defs.sh
new file mode 100644
index 0000000..0e4b723
--- /dev/null
+++ b/ld/emulparams/elf32lriscv-defs.sh
@@ -0,0 +1,42 @@
+# This is an ELF platform.
+SCRIPT_NAME=elf
+ARCH=riscv
+NO_REL_RELOCS=yes
+
+TEMPLATE_NAME=elf32
+EXTRA_EM_FILE=riscvelf
+
+ELFSIZE=32
+
+if test `echo "$host" | sed -e s/64//` = `echo "$target" | sed -e s/64//`; then
+  case " $EMULATION_LIBPATH " in
+    *" ${EMULATION_NAME} "*)
+      NATIVE=yes
+      ;;
+  esac
+fi
+
+GENERATE_SHLIB_SCRIPT=yes
+GENERATE_PIE_SCRIPT=yes
+
+TEXT_START_ADDR=0x10000
+MAXPAGESIZE="CONSTANT (MAXPAGESIZE)"
+COMMONPAGESIZE="CONSTANT (COMMONPAGESIZE)"
+
+SDATA_START_SYMBOLS="_gp = . + 0x800;
+    *(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata .srodata.*)"
+
+# Place the data section before text section.  This enables more compact
+# global variable access for RVC code via linker relaxation.
+INITIAL_READONLY_SECTIONS="
+  .data           : { *(.data) *(.data.*) *(.gnu.linkonce.d.*) }
+  .rodata         : { *(.rodata) *(.rodata.*) *(.gnu.linkonce.r.*) }
+  .srodata        : { ${SDATA_START_SYMBOLS} }
+  .sdata          : { *(.sdata .sdata.* .gnu.linkonce.s.*) }
+  .sbss           : { *(.dynsbss) *(.sbss .sbss.* .gnu.linkonce.sb.*) }
+  .bss            : { *(.dynbss) *(.bss .bss.* .gnu.linkonce.b.*) *(COMMON) }
+  . = ALIGN(${SEGMENT_SIZE}) + (. & (${MAXPAGESIZE} - 1));"
+INITIAL_READONLY_SECTIONS=".interp         : { *(.interp) } ${CREATE_PIE-${INITIAL_READONLY_SECTIONS}}"
+INITIAL_READONLY_SECTIONS="${RELOCATING+${CREATE_SHLIB-${INITIAL_READONLY_SECTIONS}}}"
+
+SDATA_START_SYMBOLS="${CREATE_PIE+${SDATA_START_SYMBOLS}}"
diff --git a/ld/emulparams/elf32lriscv.sh b/ld/emulparams/elf32lriscv.sh
new file mode 100644
index 0000000..aac08e7
--- /dev/null
+++ b/ld/emulparams/elf32lriscv.sh
@@ -0,0 +1,2 @@
+. ${srcdir}/emulparams/elf32lriscv-defs.sh
+OUTPUT_FORMAT="elf32-littleriscv"
diff --git a/ld/emulparams/elf64lriscv-defs.sh b/ld/emulparams/elf64lriscv-defs.sh
new file mode 100644
index 0000000..6308714
--- /dev/null
+++ b/ld/emulparams/elf64lriscv-defs.sh
@@ -0,0 +1,13 @@
+. ${srcdir}/emulparams/elf32lriscv-defs.sh
+ELFSIZE=64
+
+# Look for 64 bit target libraries in /lib64, /usr/lib64 etc., first
+# on Linux.
+case "$target" in
+  riscv64*-linux*)
+    case "$EMULATION_NAME" in
+      *64*)
+	LIBPATH_SUFFIX=64 ;;
+    esac
+    ;;
+esac
diff --git a/ld/emulparams/elf64lriscv.sh b/ld/emulparams/elf64lriscv.sh
new file mode 100644
index 0000000..3a6a652
--- /dev/null
+++ b/ld/emulparams/elf64lriscv.sh
@@ -0,0 +1,2 @@
+. ${srcdir}/emulparams/elf64lriscv-defs.sh
+OUTPUT_FORMAT="elf64-littleriscv"
diff --git a/ld/emultempl/riscvelf.em b/ld/emultempl/riscvelf.em
new file mode 100644
index 0000000..de35cc1
--- /dev/null
+++ b/ld/emultempl/riscvelf.em
@@ -0,0 +1,68 @@
+# This shell script emits a C file. -*- C -*-
+#   Copyright 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
+#
+# This file is part of the GNU Binutils.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+fragment <<EOF
+
+#include "ldmain.h"
+#include "ldctor.h"
+#include "elf/riscv.h"
+#include "elfxx-riscv.h"
+
+static void
+riscv_elf_before_allocation (void)
+{
+  gld${EMULATION_NAME}_before_allocation ();
+
+  if (link_info.discard == discard_sec_merge)
+    link_info.discard = discard_l;
+
+  /* We always need at least some relaxation to handle code alignment.  */
+  if (RELAXATION_DISABLED_BY_USER)
+    TARGET_ENABLE_RELAXATION;
+  else
+    ENABLE_RELAXATION;
+
+  link_info.relax_pass = 2;
+}
+
+static void
+gld${EMULATION_NAME}_after_allocation (void)
+{
+  int need_layout = 0;
+
+  /* Don't attempt to discard unused .eh_frame sections until the final link,
+     as we can't reliably tell if they're used until after relaxation.  */
+  if (!bfd_link_relocatable (&link_info))
+    {
+      need_layout = bfd_elf_discard_info (link_info.output_bfd, &link_info);
+      if (need_layout < 0)
+	{
+	  einfo ("%X%P: .eh_frame/.stab edit: %E\n");
+	  return;
+	}
+    }
+
+  gld${EMULATION_NAME}_map_segments (need_layout);
+}
+
+EOF
+
+LDEMUL_BEFORE_ALLOCATION=riscv_elf_before_allocation
+LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
-- 
2.7.3