[Buildroot] [PATCH, RE-SEND] openjdk: Add ARC HS3x/4x support via "Zero Assembly Project"
Alexey Brodkin
Alexey.Brodkin at synopsys.com
Thu Oct 21 11:59:15 UTC 2021
This allows building and running a full-scale JVM in purely
interpretive mode on ARCv2 processors.
Once JIT'ed version is available for ARC we'll obviously switch
to it to gain a faster execution.
Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Fabrice Fontaine <fontaine.fabrice at gmail.com>
Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Adam Duskett <aduskett at gmail.com>
---
Erroneously sent to buildroot at lists.buildroot.org initially,
now sending to buildroot at busybox.net.
Sorry for the noise!
---
...-Add-ARCv2-ISA-processors-support-to-Zero.patch | 109 +++++++++++++++++++++
package/openjdk/Config.in | 2 +
2 files changed, 111 insertions(+)
create mode 100644 package/openjdk/0001-Add-ARCv2-ISA-processors-support-to-Zero.patch
diff --git a/package/openjdk/0001-Add-ARCv2-ISA-processors-support-to-Zero.patch b/package/openjdk/0001-Add-ARCv2-ISA-processors-support-to-Zero.patch
new file mode 100644
index 0000000000..1ef523a419
--- /dev/null
+++ b/package/openjdk/0001-Add-ARCv2-ISA-processors-support-to-Zero.patch
@@ -0,0 +1,109 @@
+From 9a3c2a0714420186ae8d5159d5416c6fa2009ad9 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin at synopsys.com>
+Date: Mon, 18 Oct 2021 05:20:05 -0700
+Subject: [PATCH] Add ARCv2 ISA processors support to Zero
+
+This adds ARCv2 processors support in OpenJDK via
+"Zero Assembly Project" (see https://openjdk.java.net/projects/zero).
+
+That' a purely interpretive mode, so likely not that fast
+as JIT'ed version, but for starters it's much better than nothing.
+
+Once all the logistical problems are solved hopefully this
+change will be accepted upstream.
+
+Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
+---
+ make/autoconf/libraries.m4 | 8 ++++++++
+ make/autoconf/platform.m4 | 8 ++++++++
+ src/hotspot/os/linux/os_linux.cpp | 8 +++++++-
+ 3 files changed, 23 insertions(+), 1 deletion(-)
+
+diff --git a/make/autoconf/libraries.m4 b/make/autoconf/libraries.m4
+index 5120918aed2..f7a99955874 100644
+--- a/make/autoconf/libraries.m4
++++ b/make/autoconf/libraries.m4
+@@ -122,6 +122,14 @@ AC_DEFUN_ONCE([LIB_SETUP_LIBRARIES],
+ BASIC_JVM_LIBS="$BASIC_JVM_LIBS -lpthread"
+ fi
+
++ # Libatomic library
++ # 32-bit ARC needs fallback library for 8-byte atomic ops
++ # Inspired by a fix for MIPS, see https://github.com/openjdk/jdk/commit/1b3aa3af
++ if test "x$OPENJDK_TARGET_OS" = xlinux &&
++ (test "x$OPENJDK_TARGET_CPU" = xarc); then
++ BASIC_JVM_LIBS="$BASIC_JVM_LIBS -latomic"
++ fi
++
+ # perfstat lib
+ if test "x$OPENJDK_TARGET_OS" = xaix; then
+ BASIC_JVM_LIBS="$BASIC_JVM_LIBS -lperfstat"
+diff --git a/make/autoconf/platform.m4 b/make/autoconf/platform.m4
+index c0f2446dbd7..dc416ece885 100644
+--- a/make/autoconf/platform.m4
++++ b/make/autoconf/platform.m4
+@@ -54,6 +54,12 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],
+ VAR_CPU_BITS=64
+ VAR_CPU_ENDIAN=little
+ ;;
++ arc)
++ VAR_CPU=arc
++ VAR_CPU_ARCH=arc
++ VAR_CPU_BITS=32
++ VAR_CPU_ENDIAN=little
++ ;;
+ arm*)
+ VAR_CPU=arm
+ VAR_CPU_ARCH=arm
+@@ -478,6 +484,8 @@ AC_DEFUN([PLATFORM_SETUP_LEGACY_VARS_HELPER],
+ HOTSPOT_$1_CPU_DEFINE=PPC64
+
+ # The cpu defines below are for zero, we don't support them directly.
++ elif test "x$OPENJDK_$1_CPU" = xarc; then
++ HOTSPOT_$1_CPU_DEFINE=ARC
+ elif test "x$OPENJDK_$1_CPU" = xsparc; then
+ HOTSPOT_$1_CPU_DEFINE=SPARC
+ elif test "x$OPENJDK_$1_CPU" = xppc; then
+diff --git a/src/hotspot/os/linux/os_linux.cpp b/src/hotspot/os/linux/os_linux.cpp
+index b08caf4d5d3..2bf084895ba 100644
+--- a/src/hotspot/os/linux/os_linux.cpp
++++ b/src/hotspot/os/linux/os_linux.cpp
+@@ -1858,6 +1858,9 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
+ #ifndef EM_AARCH64
+ #define EM_AARCH64 183 /* ARM AARCH64 */
+ #endif
++#ifndef EM_ARC_COMPACT2
++ #define EM_ARC_COMPACT2 195 /* ARC ARCv2 ISA */
++#endif
+ #ifndef EM_RISCV
+ #define EM_RISCV 243 /* RISC-V */
+ #endif
+@@ -1879,6 +1882,7 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
+ {EM_SH, EM_SH, ELFCLASS32, ELFDATA2MSB, (char*)"SuperH BE"},
+ #endif
+ {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"},
++ {EM_ARC_COMPACT2, EM_ARC_COMPACT2, ELFCLASS32, ELFDATA2LSB, (char*)"ARC"},
+ // we only support 64 bit z architecture
+ {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"},
+ {EM_ALPHA, EM_ALPHA, ELFCLASS64, ELFDATA2LSB, (char*)"Alpha"},
+@@ -1906,6 +1910,8 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
+ static Elf32_Half running_arch_code=EM_PPC;
+ #elif (defined AARCH64)
+ static Elf32_Half running_arch_code=EM_AARCH64;
++#elif (defined ARC)
++ static Elf32_Half running_arch_code=EM_ARC_COMPACT2;
+ #elif (defined ARM)
+ static Elf32_Half running_arch_code=EM_ARM;
+ #elif (defined S390)
+@@ -1926,7 +1932,7 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
+ static Elf32_Half running_arch_code=EM_RISCV;
+ #else
+ #error Method os::dll_load requires that one of following is defined:\
+- AARCH64, ALPHA, ARM, AMD64, IA32, IA64, M68K, MIPS, MIPSEL, PARISC, __powerpc__, __powerpc64__, RISCV, S390, SH, __sparc
++ AARCH64, ALPHA, ARC, ARM, AMD64, IA32, IA64, M68K, MIPS, MIPSEL, PARISC, __powerpc__, __powerpc64__, RISCV, S390, SH, __sparc
+ #endif
+
+ // Identify compatibility class for VM's architecture and library's architecture
+--
+2.16.2
+
diff --git a/package/openjdk/Config.in b/package/openjdk/Config.in
index f2b7f5ffd7..c09d1c0162 100644
--- a/package/openjdk/Config.in
+++ b/package/openjdk/Config.in
@@ -6,6 +6,7 @@ config BR2_PACKAGE_HOST_OPENJDK_BIN_ARCH_SUPPORTS
config BR2_PACKAGE_OPENJDK_ARCH_SUPPORTS
bool
default y if BR2_aarch64
+ default y if BR2_arc && !(BR2_arc750d || BR2_arc770d)
default y if BR2_arm
default y if BR2_i386 || BR2_x86_64
default y if BR2_m68k
@@ -121,6 +122,7 @@ choice
prompt "openjdk variant"
default BR2_PACKAGE_OPENJDK_JVM_VARIANT_SERVER if !BR2_powerpc
default BR2_PACKAGE_OPENJDK_JVM_VARIANT_ZERO if BR2_powerpc
+ default BR2_PACKAGE_OPENJDK_JVM_VARIANT_ZERO if BR2_arc
config BR2_PACKAGE_OPENJDK_JVM_VARIANT_CLIENT
bool "client"
--
2.16.2
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