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[PATCH 5/6] RISC-V ld port
- From: Andrew Waterman <palmer at dabbelt dot com>
- To: binutils at sourceware dot org
- Cc: Palmer Dabbelt <palmer at dabbelt dot com>
- Cc: Andrew Waterman <andrew at sifive dot com>
- Date: Tue, 11 Oct 2016 16:46:10 -0700
- Subject: [PATCH 5/6] RISC-V ld port
- Authentication-results: sourceware.org; auth=none
- References: <1476229571-22422-1-git-send-email-andrew@sifive.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