--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/sparc/vm/runtime_sparc.cpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,142 @@
+/*
+ * Copyright 1998-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_runtime_sparc.cpp.incl"
+
+
+#define __ masm->
+
+ExceptionBlob *OptoRuntime::_exception_blob;
+
+//------------------------------ generate_exception_blob ---------------------------
+// creates exception blob at the end
+// Using exception blob, this code is jumped from a compiled method.
+// (see emit_exception_handler in sparc.ad file)
+//
+// Given an exception pc at a call we call into the runtime for the
+// handler in this method. This handler might merely restore state
+// (i.e. callee save registers) unwind the frame and jump to the
+// exception handler for the nmethod if there is no Java level handler
+// for the nmethod.
+//
+// This code is entered with a jmp.
+//
+// Arguments:
+// O0: exception oop
+// O1: exception pc
+//
+// Results:
+// O0: exception oop
+// O1: exception pc in caller or ???
+// destination: exception handler of caller
+//
+// Note: the exception pc MUST be at a call (precise debug information)
+//
+void OptoRuntime::generate_exception_blob() {
+ // allocate space for code
+ ResourceMark rm;
+ int pad = VerifyThread ? 256 : 0;// Extra slop space for more verify code
+
+ // setup code generation tools
+ // Measured 8/7/03 at 256 in 32bit debug build (no VerifyThread)
+ // Measured 8/7/03 at 528 in 32bit debug build (VerifyThread)
+ CodeBuffer buffer("exception_blob", 600+pad, 512);
+ MacroAssembler* masm = new MacroAssembler(&buffer);
+
+ int framesize_in_bytes = __ total_frame_size_in_bytes(0);
+ int framesize_in_words = framesize_in_bytes / wordSize;
+ int framesize_in_slots = framesize_in_bytes / sizeof(jint);
+
+ Label L;
+
+ int start = __ offset();
+
+ __ verify_thread();
+ __ st_ptr(Oexception, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())));
+ __ st_ptr(Oissuing_pc, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())));
+
+ // This call does all the hard work. It checks if an exception catch
+ // exists in the method.
+ // If so, it returns the handler address.
+ // If the nmethod has been deoptimized and it had a handler the handler
+ // address is the deopt blob unpack_with_exception entry.
+ //
+ // If no handler exists it prepares for stack-unwinding, restoring the callee-save
+ // registers of the frame being removed.
+ //
+ __ save_frame(0);
+
+ __ mov(G2_thread, O0);
+ __ set_last_Java_frame(SP, noreg);
+ __ save_thread(L7_thread_cache);
+
+ // This call can block at exit and nmethod can be deoptimized at that
+ // point. If the nmethod had a catch point we would jump to the
+ // now deoptimized catch point and fall thru the vanilla deopt
+ // path and lose the exception
+ // Sure would be simpler if this call didn't block!
+ __ call(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C), relocInfo::runtime_call_type);
+ __ delayed()->mov(L7_thread_cache, O0);
+
+ // Set an oopmap for the call site. This oopmap will only be used if we
+ // are unwinding the stack. Hence, all locations will be dead.
+ // Callee-saved registers will be the same as the frame above (i.e.,
+ // handle_exception_stub), since they were restored when we got the
+ // exception.
+
+ OopMapSet *oop_maps = new OopMapSet();
+ oop_maps->add_gc_map( __ offset()-start, new OopMap(framesize_in_slots, 0));
+
+ __ bind(L);
+ __ restore_thread(L7_thread_cache);
+ __ reset_last_Java_frame();
+
+ __ mov(O0, G3_scratch); // Move handler address to temp
+ __ restore();
+
+ // G3_scratch contains handler address
+ // Since this may be the deopt blob we must set O7 to look like we returned
+ // from the original pc that threw the exception
+
+ __ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())), O7);
+ __ sub(O7, frame::pc_return_offset, O7);
+
+
+ assert(Assembler::is_simm13(in_bytes(JavaThread::exception_oop_offset())), "exception offset overflows simm13, following ld instruction cannot be in delay slot");
+ __ ld_ptr(Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())), Oexception); // O0
+#ifdef ASSERT
+ __ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_handler_pc_offset())));
+ __ st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_pc_offset())));
+#endif
+ __ JMP(G3_scratch, 0);
+ // Clear the exception oop so GC no longer processes it as a root.
+ __ delayed()->st_ptr(G0, Address(G2_thread, 0, in_bytes(JavaThread::exception_oop_offset())));
+
+ // -------------
+ // make sure all code is generated
+ masm->flush();
+
+ _exception_blob = ExceptionBlob::create(&buffer, oop_maps, framesize_in_words);
+}