--- a/hotspot/src/cpu/aarch64/vm/macroAssembler_aarch64.cpp Fri Dec 04 04:29:31 2015 +0000
+++ b/hotspot/src/cpu/aarch64/vm/macroAssembler_aarch64.cpp Fri Dec 04 04:06:37 2015 -0500
@@ -41,6 +41,7 @@
#include "runtime/icache.hpp"
#include "runtime/interfaceSupport.hpp"
#include "runtime/sharedRuntime.hpp"
+#include "runtime/thread.hpp"
#if INCLUDE_ALL_GCS
#include "gc/g1/g1CollectedHeap.inline.hpp"
@@ -4653,3 +4654,23 @@
BIND(DONE);
sub(result, result, len); // Return index where we stopped
}
+
+// get_thread() can be called anywhere inside generated code so we
+// need to save whatever non-callee save context might get clobbered
+// by the call to JavaThread::aarch64_get_thread_helper() or, indeed,
+// the call setup code.
+//
+// aarch64_get_thread_helper() clobbers only r0, r1, and flags.
+//
+void MacroAssembler::get_thread(Register dst) {
+ RegSet saved_regs = RegSet::range(r0, r1) + lr - dst;
+ push(saved_regs, sp);
+
+ mov(lr, CAST_FROM_FN_PTR(address, JavaThread::aarch64_get_thread_helper));
+ blrt(lr, 1, 0, 1);
+ if (dst != c_rarg0) {
+ mov(dst, c_rarg0);
+ }
+
+ pop(saved_regs, sp);
+}