Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2013 SAP AG. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #ifdef COMPILER2

 #include "asm/assembler.inline.hpp"

 #include "asm/macroAssembler.inline.hpp"

 #include "classfile/systemDictionary.hpp"

 #include "code/vmreg.hpp"

 #include "interpreter/interpreter.hpp"

 #include "nativeInst_ppc.hpp"

 #include "opto/runtime.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/sharedRuntime.hpp"

 #include "runtime/stubRoutines.hpp"

 #include "runtime/vframeArray.hpp"

 #include "utilities/globalDefinitions.hpp"

 #include "vmreg_ppc.inline.hpp"

 #endif

 #define __ masm->

 #ifdef COMPILER2

 // SP adjustment (must use unextended SP) for method handle call sites

 // during exception handling.

 static intptr_t adjust_SP_for_methodhandle_callsite(JavaThread *thread) {

   RegisterMap map(thread, false);

   // The frame constructor will do the correction for us (see frame::adjust_unextended_SP).

   frame mh_caller_frame = thread->last_frame().sender(&map);

   assert(mh_caller_frame.is_compiled_frame(), "Only may reach here for compiled MH call sites");

   return (intptr_t) mh_caller_frame.unextended_sp();

 }

 //------------------------------generate_exception_blob---------------------------

 // Creates exception blob at the end.

 // Using exception blob, this code is jumped from a compiled method.

 //

 // 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:

 //   R3_ARG1: exception oop

 //   R4_ARG2: exception pc

 //

 // Results:

 //   R3_ARG1: exception oop

 //   R4_ARG2: exception pc in caller

 //   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 the code.

   ResourceMark rm;

   // Setup code generation tools.

   CodeBuffer buffer("exception_blob", 2048, 1024);

   InterpreterMacroAssembler* masm = new InterpreterMacroAssembler(&buffer);

   address start = __ pc();

   int frame_size_in_bytes = frame::abi_reg_args_size;

   OopMap* map = new OopMap(frame_size_in_bytes / sizeof(jint), 0);

   // Exception pc is 'return address' for stack walker.

   __ std(R4_ARG2/*exception pc*/, _abi(lr), R1_SP);

   // Store the exception in the Thread object.

   __ std(R3_ARG1/*exception oop*/, in_bytes(JavaThread::exception_oop_offset()), R16_thread);

   __ std(R4_ARG2/*exception pc*/,  in_bytes(JavaThread::exception_pc_offset()),  R16_thread);

   // Save callee-saved registers.

   // Push a C frame for the exception blob. It is needed for the C call later on.

   __ push_frame_reg_args(0, R11_scratch1);

   // This call does all the hard work. It checks if an exception handler

   // exists in the method.

   // If so, it returns the handler address.

   // If not, it prepares for stack-unwinding, restoring the callee-save

   // registers of the frame being removed.

   __ set_last_Java_frame(/*sp=*/R1_SP, noreg);

   __ mr(R3_ARG1, R16_thread);

 #if defined(ABI_ELFv2)

   __ call_c((address) OptoRuntime::handle_exception_C, relocInfo::none);

 #else

   __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, OptoRuntime::handle_exception_C),

             relocInfo::none);

 #endif

   address calls_return_pc = __ last_calls_return_pc();

 # ifdef ASSERT

   __ cmpdi(CCR0, R3_RET, 0);

   __ asm_assert_ne("handle_exception_C must not return NULL", 0x601);

 # endif

   // 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(calls_return_pc - start, map);

   // Get unextended_sp for method handle call sites.

   Label mh_callsite, mh_done; // Use a 2nd c call if it's a method handle call site.

   __ lwa(R4_ARG2, in_bytes(JavaThread::is_method_handle_return_offset()), R16_thread);

   __ cmpwi(CCR0, R4_ARG2, 0);

   __ bne(CCR0, mh_callsite);

   __ mtctr(R3_RET); // Move address of exception handler to SR_CTR.

   __ reset_last_Java_frame();

   __ pop_frame();

   __ bind(mh_done);

   // We have a handler in register SR_CTR (could be deopt blob).

   // Get the exception oop.

   __ ld(R3_ARG1, in_bytes(JavaThread::exception_oop_offset()), R16_thread);

   // Get the exception pc in case we are deoptimized.

   __ ld(R4_ARG2, in_bytes(JavaThread::exception_pc_offset()), R16_thread);

   // Reset thread values.

   __ li(R0, 0);

 #ifdef ASSERT

   __ std(R0, in_bytes(JavaThread::exception_handler_pc_offset()), R16_thread);

   __ std(R0, in_bytes(JavaThread::exception_pc_offset()), R16_thread);

 #endif

   // Clear the exception oop so GC no longer processes it as a root.

   __ std(R0, in_bytes(JavaThread::exception_oop_offset()), R16_thread);

   // Move exception pc into SR_LR.

   __ mtlr(R4_ARG2);

   __ bctr();

   // Same as above, but also set sp to unextended_sp.

   __ bind(mh_callsite);

   __ mr(R31, R3_RET); // Save branch address.

   __ mr(R3_ARG1, R16_thread);

 #if defined(ABI_ELFv2)

   __ call_c((address) adjust_SP_for_methodhandle_callsite, relocInfo::none);

 #else

   __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, adjust_SP_for_methodhandle_callsite), relocInfo::none);

 #endif

   // Returns unextended_sp in R3_RET.

   __ mtctr(R31); // Move address of exception handler to SR_CTR.

   __ reset_last_Java_frame();

   __ mr(R1_SP, R3_RET); // Set sp to unextended_sp.

   __ b(mh_done);

   // Make sure all code is generated.

   masm->flush();

   // Set exception blob.

   _exception_blob = ExceptionBlob::create(&buffer, oop_maps,

                                           frame_size_in_bytes/wordSize);

 }

 #endif // COMPILER2