8270517: Add Zero support for LoongArch

Reviewed-by: dholmes, erikj, shade

Author: theaoqi

make/autoconf/build-aux/config.guess

@@ -102,6 +102,15 @@ if [ "x$OUT" = x ]; then
   fi
 fi
 
+# Test and fix LoongArch64.
+if [ "x$OUT" = x ]; then
+  if [ `uname -s` = Linux ]; then
+    if [ `uname -m` = loongarch64 ]; then
+      OUT=loongarch64-unknown-linux-gnu
+    fi
+  fi
+fi
+
 # Test and fix cpu on macos-aarch64, uname -p reports arm, buildsys expects aarch64
 echo $OUT | grep arm-apple-darwin > /dev/null 2> /dev/null
 if test $? != 0; then

make/autoconf/platform.m4

@@ -72,6 +72,12 @@ AC_DEFUN([PLATFORM_EXTRACT_VARS_FROM_CPU],
       VAR_CPU_BITS=64
       VAR_CPU_ENDIAN=little
       ;;
+    loongarch64)
+      VAR_CPU=loongarch64
+      VAR_CPU_ARCH=loongarch
+      VAR_CPU_BITS=64
+      VAR_CPU_ENDIAN=little
+      ;;
     m68k)
       VAR_CPU=m68k
       VAR_CPU_ARCH=m68k

src/hotspot/os/linux/os_linux.cpp

@@ -1668,6 +1668,9 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
 #ifndef EM_RISCV
   #define EM_RISCV      243               /* RISC-V */
 #endif
+#ifndef EM_LOONGARCH
+  #define EM_LOONGARCH  258               /* LoongArch */
+#endif
 
   static const arch_t arch_array[]={
     {EM_386,         EM_386,     ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"},
@@ -1695,6 +1698,7 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
     {EM_68K,         EM_68K,     ELFCLASS32, ELFDATA2MSB, (char*)"M68k"},
     {EM_AARCH64,     EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"},
     {EM_RISCV,       EM_RISCV,   ELFCLASS64, ELFDATA2LSB, (char*)"RISC-V"},
+    {EM_LOONGARCH,   EM_LOONGARCH, ELFCLASS64, ELFDATA2LSB, (char*)"LoongArch"},
   };
 
 #if  (defined IA32)
@@ -1731,9 +1735,11 @@ void * os::dll_load(const char *filename, char *ebuf, int ebuflen) {
   static  Elf32_Half running_arch_code=EM_SH;
 #elif  (defined RISCV)
   static  Elf32_Half running_arch_code=EM_RISCV;
+#elif  (defined LOONGARCH)
+  static  Elf32_Half running_arch_code=EM_LOONGARCH;
 #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, ARM, AMD64, IA32, IA64, LOONGARCH, M68K, MIPS, MIPSEL, PARISC, __powerpc__, __powerpc64__, RISCV, S390, SH, __sparc
 #endif
 
   // Identify compatibility class for VM's architecture and library's architecture