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/*
* Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2016 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 "code/vmreg.hpp"
#include "interpreter/interpreter.hpp"
#include "memory/resourceArea.hpp"
#include "nativeInst_s390.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"
#include "vmreg_s390.inline.hpp"
#endif
#define __ masm->
//------------------------------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 s390.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 branch.
//
// Arguments:
// Z_R2(=Z_ARG1): exception oop
// Z_R3(=Z_ARG2): exception pc
//
// Results:
// Z_R2: exception oop
// Z_R3: 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);
MacroAssembler* masm = new MacroAssembler(&buffer);
Register handle_exception = Z_ARG5;
__ verify_thread();
__ z_stg(Z_ARG1/*exception oop*/, Address(Z_thread, JavaThread::exception_oop_offset()));
__ z_stg(Z_ARG2/*issuing pc*/, Address(Z_thread, JavaThread::exception_pc_offset()));
// Store issuing pc as return pc into
// caller's frame. stack-walking needs it. R14 is not valid here,
// because this code gets entered with a jump.
__ z_stg(Z_ARG2/*issuing pc*/, _z_abi(return_pc), Z_SP);
// The following call to function OptoRuntime::handle_exception_C
// 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's
// unpack_with_exception entry.
// push a C frame for the exception blob. it is needed for the
// C call later on.
Register saved_sp = Z_R11;
__ z_lgr(saved_sp, Z_SP);
// push frame for blob.
int frame_size = __ push_frame_abi160(0);
__ get_PC(Z_R1/*scratch*/);
__ set_last_Java_frame(/*sp=*/Z_SP, /*pc=*/Z_R1);
// This call can lead to deoptimization of the nmethod holding the handler.
__ z_lgr(Z_ARG1, Z_thread); // argument of C function
__ call_c(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C));
__ z_lgr(handle_exception, Z_RET);
__ reset_last_Java_frame();
// Pop the exception blob's C frame that has been pushed before.
__ z_lgr(Z_SP, saved_sp);
// [Z_RET]!=NULL was possible in hotspot5 but not in sapjvm6.
// C2I adapter extensions are now removed by a resize in the frame manager
// (unwind_initial_activation_pending_exception).
#ifdef ASSERT
__ z_ltgr(handle_exception, handle_exception);
__ asm_assert_ne("handler must not be NULL", 0x852);
#endif
// Handle_exception contains the handler address. If the associated frame
// has been deoptimized then the handler has been patched to jump to
// the deoptimization blob.
// If the exception handler jumps to the deoptimization blob, the
// exception pc will be read from there.
__ z_lg(Z_ARG2, Address(Z_thread, JavaThread::exception_pc_offset()));
__ z_lg(Z_ARG1, Address(Z_thread, JavaThread::exception_oop_offset()));
// Clear the exception oop so GC no longer processes it as a root.
__ clear_mem(Address(Z_thread, JavaThread::exception_oop_offset()),sizeof(intptr_t));
#ifdef ASSERT
__ clear_mem(Address(Z_thread, JavaThread::exception_handler_pc_offset()), sizeof(intptr_t));
__ clear_mem(Address(Z_thread, JavaThread::exception_pc_offset()), sizeof(intptr_t));
#endif
__ z_br(handle_exception);
// Make sure all code is generated.
masm->flush();
// Set exception blob.
OopMapSet *oop_maps = NULL;
_exception_blob = ExceptionBlob::create(&buffer, oop_maps, frame_size/wordSize);
}
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