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OMRJitCodeRWXObjectFormat.cpp
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OMRJitCodeRWXObjectFormat.cpp
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/*******************************************************************************
* Copyright (c) 2021, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "codegen/CodeGenerator.hpp"
#include "codegen/MemoryReference.hpp"
#include "env/FilePointerDecl.hpp"
#include "il/MethodSymbol.hpp"
#include "il/SymbolReference.hpp"
#include "infra/Assert.hpp"
#include "objectfmt/FunctionCallData.hpp"
#include "objectfmt/JitCodeRWXObjectFormat.hpp"
#include "objectfmt/OMRJitCodeRWXObjectFormat.hpp"
#include "runtime/CodeMetaDataManager.hpp"
#include "runtime/Runtime.hpp"
#include "z/codegen/CallSnippet.hpp"
#include "z/codegen/S390GenerateInstructions.hpp"
TR::Instruction *
OMR::Z::JitCodeRWXObjectFormat::emitFunctionCall(TR::FunctionCallData &data)
{
TR::SymbolReference *callSymRef = data.methodSymRef;
TR::CodeGenerator *cg = data.cg;
TR::Node *callNode = data.callNode;
if (callSymRef == NULL)
{
TR_ASSERT_FATAL_WITH_NODE(callNode, data.runtimeHelperIndex > 0, "FunctionCallData does not contain symbol reference for call or valid TR_RuntimeHelper");
callSymRef = cg->symRefTab()->findOrCreateRuntimeHelper(data.runtimeHelperIndex, false, false, false);
}
uintptr_t targetAddress = data.targetAddress != NULL ? data.targetAddress : reinterpret_cast<uintptr_t>(callSymRef->getMethodAddress());
TR_ASSERT_FATAL_WITH_NODE(callNode, targetAddress != NULL, "Unable to make a call as targetAddress for the Call is not found.");
// Now as we are going to make call, we need Return Address register.
TR_ASSERT_FATAL_WITH_NODE(callNode, data.returnAddressReg != NULL, "returnAddressReg should be set to make a function call.");
// We do not need to check if the address is addressible using RIL type
// instruction, as the instruction API will check for it and generate
// trampolines if needed.
TR::Instruction *callInstr = generateRILInstruction(cg, TR::InstOpCode::BRASL, callNode, data.returnAddressReg, callSymRef, reinterpret_cast<void*>(targetAddress), data.prevInstr);
data.out_callInstr = callInstr;
if (data.regDeps != NULL)
{
callInstr->setDependencyConditions(data.regDeps);
}
return callInstr;
}
uint8_t *
OMR::Z::JitCodeRWXObjectFormat::encodeFunctionCall(TR::FunctionCallData &data)
{
TR::SymbolReference *callSymRef = data.methodSymRef;
TR::CodeGenerator *cg = data.cg;
TR::Node *callNode = data.callNode;
if (callSymRef == NULL)
{
TR_ASSERT_FATAL_WITH_NODE(callNode, data.runtimeHelperIndex > 0, "FunctionCallData does not contain symbol reference for call or valid TR_RuntimeHelper");
callSymRef = cg->symRefTab()->findOrCreateRuntimeHelper(data.runtimeHelperIndex, false, false, false);
}
uintptr_t targetAddress = data.targetAddress != NULL ? data.targetAddress : reinterpret_cast<uintptr_t>(callSymRef->getMethodAddress());
uint8_t *cursor = data.bufferAddress;
TR_ASSERT_FATAL_WITH_NODE(callNode, targetAddress != NULL, "Unable to make a call as targetAddress for the Call is not found.");
if (data.snippet->getKind() == TR::Snippet::IsUnresolvedCall || data.snippet->getKind() == TR::Snippet::IsUnresolvedData)
{
// LARL r14,AddressOfConstantDataArea
uintptr_t larlInstructionAddress = reinterpret_cast<uintptr_t>(cursor);
*reinterpret_cast<int16_t *>(cursor) = 0xC0E0;
cursor += sizeof(int16_t);
uint8_t *larlOffsetAddress = cursor;
// For now skipping the encoding of offsetInHalfwords for LARL, will be updated later.
cursor += sizeof(int32_t);
*reinterpret_cast<int32_t *>(cursor) = 0xe300e000 + ((static_cast<int32_t>(cg->getEntryPointRegister()) - 1 ) << 20 );
cursor += sizeof(int32_t);
*reinterpret_cast<int16_t *>(cursor) = cg->comp()->target().is64Bit() ? 0x0004 : 0x0014;
cursor += sizeof(int16_t);
// BCR rEP
*reinterpret_cast<int16_t *>(cursor) = 0x07F0 + static_cast<int16_t>(cg->getEntryPointRegister() - 1);
cursor += sizeof(int16_t);
// Now updating the offset in LARL instruction
*reinterpret_cast<int32_t *>(larlOffsetAddress) = static_cast<int32_t>(((uintptr_t)cursor + data.snippet->getPadBytes() - larlInstructionAddress ) / 2);
}
else
{
uint8_t *instrAddr = cursor;
*reinterpret_cast<int16_t *>(cursor) = 0xC0E5;
cursor += sizeof(int16_t);
*reinterpret_cast<int32_t *>(cursor) = TR::S390CallSnippet::adjustCallOffsetWithTrampoline(targetAddress, instrAddr, callSymRef, data.snippet);
// TODO: We should be able to use reloKind field from the FunctionCallData to add relocation.
// Probably only change apart from the hardcoded TR_HelperAddress is to get the correct Diagnostic message for AOT.
AOTcgDiag1(cg->comp(), "add TR_AbsoluteHelperAddress cursor=%x\n", cursor);
cg->addProjectSpecializedRelocation(cursor, (uint8_t*) callSymRef, NULL, TR_HelperAddress,
__FILE__, __LINE__, callNode);
cursor += sizeof(int32_t);
}
return cursor;
}
uint8_t *
OMR::Z::JitCodeRWXObjectFormat::printEncodedFunctionCall(TR::FILE *pOutFile, TR::FunctionCallData &data)
{
uint8_t *bufferPos = data.bufferAddress;
TR_Debug *debug = data.cg->getDebug();
if (data.snippet->getKind() == TR::Snippet::IsUnresolvedCall || data.snippet->getKind() == TR::Snippet::IsUnresolvedData)
{
debug->printPrefix(pOutFile, NULL, bufferPos, 6);
trfprintf(pOutFile, "LARL \tGPR14, <%p>\t# Start of Data Const.",
bufferPos + 6 /*LARL*/ + 6 /*LG/LGF*/ + 2 /*BRC*/ + data.snippet->getPadBytes());
bufferPos += 6;
debug->printPrefix(pOutFile, NULL, bufferPos, 6);
trfprintf(pOutFile, data.cg->comp()->target().is64Bit() ? "LG \tGPR_EP, 0(GPR14)" : "LGF \tGPR_EP, 0(GPR14)");
bufferPos += 6;
debug->printPrefix(pOutFile, NULL, bufferPos, 2);
trfprintf(pOutFile, "BCR \tGPR_EP");
bufferPos += 2;
}
else
{
debug->printPrefix(pOutFile, NULL, bufferPos, 6);
trfprintf(pOutFile, "BRASL \tGPR14, <%p>\t# Branch to Helper Method %s",
data.snippet->getSnippetDestAddr(),
data.snippet->usedTrampoline() ? "- Trampoline Used. " : "");
bufferPos += 6;
}
return bufferPos;
}