blob: dc3891ebbfadc17072400813c4361df436b8e5e3 [file] [log] [blame]
/*
* Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2018 SAP SE. 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/macroAssembler.inline.hpp"
#include "classfile/systemDictionary.hpp"
#include "code/vmreg.hpp"
#include "interpreter/interpreter.hpp"
#include "interpreter/interp_masm.hpp"
#include "memory/resourceArea.hpp"
#include "nativeInst_ppc.hpp"
#include "opto/runtime.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
#include "runtime/vframeArray.hpp"
#include "utilities/globalDefinitions.hpp"
#endif
#define __ masm->
#ifdef COMPILER2
//------------------------------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);
__ mtctr(R3_RET); // Move address of exception handler to SR_CTR.
__ reset_last_Java_frame();
__ pop_frame();
// 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();
// 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