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/*
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "precompiled.hpp"
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#include "asm/macroAssembler.inline.hpp"
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#include "code/codeBlob.hpp"
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#include "code/vmreg.inline.hpp"
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#include "gc/z/zBarrier.inline.hpp"
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#include "gc/z/zBarrierSet.hpp"
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#include "gc/z/zBarrierSetAssembler.hpp"
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#include "gc/z/zBarrierSetRuntime.hpp"
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#include "gc/z/zThreadLocalData.hpp"
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#include "memory/resourceArea.hpp"
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#include "runtime/sharedRuntime.hpp"
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#include "utilities/macros.hpp"
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#ifdef COMPILER1
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#include "c1/c1_LIRAssembler.hpp"
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#include "c1/c1_MacroAssembler.hpp"
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#include "gc/z/c1/zBarrierSetC1.hpp"
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#endif // COMPILER1
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#ifdef COMPILER2
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#include "gc/z/c2/zBarrierSetC2.hpp"
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#endif // COMPILER2
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#ifdef PRODUCT
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#define BLOCK_COMMENT(str) /* nothing */
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#else
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#define BLOCK_COMMENT(str) __ block_comment(str)
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#endif
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#undef __
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#define __ masm->
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void ZBarrierSetAssembler::load_at(MacroAssembler* masm,
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DecoratorSet decorators,
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BasicType type,
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Register dst,
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Address src,
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Register tmp1,
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Register tmp_thread) {
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if (!ZBarrierSet::barrier_needed(decorators, type)) {
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// Barrier not needed
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BarrierSetAssembler::load_at(masm, decorators, type, dst, src, tmp1, tmp_thread);
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return;
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}
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assert_different_registers(rscratch1, rscratch2, src.base());
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assert_different_registers(rscratch1, rscratch2, dst);
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RegSet savedRegs = RegSet::range(r0, r28) - RegSet::of(dst, rscratch1, rscratch2);
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Label done;
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// Load bad mask into scratch register.
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__ ldr(rscratch1, address_bad_mask_from_thread(rthread));
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__ lea(rscratch2, src);
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__ ldr(dst, src);
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// Test reference against bad mask. If mask bad, then we need to fix it up.
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__ tst(dst, rscratch1);
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__ br(Assembler::EQ, done);
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__ enter();
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__ push(savedRegs, sp);
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if (c_rarg0 != dst) {
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__ mov(c_rarg0, dst);
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}
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__ mov(c_rarg1, rscratch2);
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int step = 4 * wordSize;
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__ mov(rscratch2, -step);
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__ sub(sp, sp, step);
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for (int i = 28; i >= 4; i -= 4) {
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__ st1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
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as_FloatRegister(i+3), __ T1D, Address(__ post(sp, rscratch2)));
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}
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__ st1(as_FloatRegister(0), as_FloatRegister(1), as_FloatRegister(2),
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as_FloatRegister(3), __ T1D, Address(sp));
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__ call_VM_leaf(ZBarrierSetRuntime::load_barrier_on_oop_field_preloaded_addr(decorators), 2);
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for (int i = 0; i <= 28; i += 4) {
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__ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
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as_FloatRegister(i+3), __ T1D, Address(__ post(sp, step)));
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}
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// Make sure dst has the return value.
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if (dst != r0) {
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__ mov(dst, r0);
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}
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__ pop(savedRegs, sp);
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__ leave();
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__ bind(done);
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}
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#ifdef ASSERT
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void ZBarrierSetAssembler::store_at(MacroAssembler* masm,
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DecoratorSet decorators,
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BasicType type,
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Address dst,
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Register val,
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Register tmp1,
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Register tmp2) {
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// Verify value
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if (is_reference_type(type)) {
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// Note that src could be noreg, which means we
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// are storing null and can skip verification.
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if (val != noreg) {
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Label done;
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// tmp1 and tmp2 are often set to noreg.
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RegSet savedRegs = RegSet::of(rscratch1);
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__ push(savedRegs, sp);
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__ ldr(rscratch1, address_bad_mask_from_thread(rthread));
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__ tst(val, rscratch1);
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__ br(Assembler::EQ, done);
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__ stop("Verify oop store failed");
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__ should_not_reach_here();
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__ bind(done);
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__ pop(savedRegs, sp);
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}
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}
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// Store value
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BarrierSetAssembler::store_at(masm, decorators, type, dst, val, tmp1, tmp2);
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}
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#endif // ASSERT
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void ZBarrierSetAssembler::arraycopy_prologue(MacroAssembler* masm,
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DecoratorSet decorators,
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bool is_oop,
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Register src,
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Register dst,
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Register count,
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RegSet saved_regs) {
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if (!is_oop) {
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// Barrier not needed
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return;
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}
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BLOCK_COMMENT("ZBarrierSetAssembler::arraycopy_prologue {");
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assert_different_registers(src, count, rscratch1);
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__ pusha();
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if (count == c_rarg0) {
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if (src == c_rarg1) {
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// exactly backwards!!
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__ mov(rscratch1, c_rarg0);
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__ mov(c_rarg0, c_rarg1);
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__ mov(c_rarg1, rscratch1);
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} else {
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__ mov(c_rarg1, count);
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__ mov(c_rarg0, src);
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}
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} else {
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__ mov(c_rarg0, src);
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__ mov(c_rarg1, count);
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}
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__ call_VM_leaf(ZBarrierSetRuntime::load_barrier_on_oop_array_addr(), 2);
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__ popa();
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BLOCK_COMMENT("} ZBarrierSetAssembler::arraycopy_prologue");
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}
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void ZBarrierSetAssembler::try_resolve_jobject_in_native(MacroAssembler* masm,
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Register jni_env,
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Register robj,
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Register tmp,
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Label& slowpath) {
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BLOCK_COMMENT("ZBarrierSetAssembler::try_resolve_jobject_in_native {");
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assert_different_registers(jni_env, robj, tmp);
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// Resolve jobject
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BarrierSetAssembler::try_resolve_jobject_in_native(masm, jni_env, robj, tmp, slowpath);
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// The Address offset is too large to direct load - -784. Our range is +127, -128.
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__ mov(tmp, (long int)(in_bytes(ZThreadLocalData::address_bad_mask_offset()) -
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in_bytes(JavaThread::jni_environment_offset())));
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// Load address bad mask
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__ add(tmp, jni_env, tmp);
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__ ldr(tmp, Address(tmp));
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// Check address bad mask
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__ tst(robj, tmp);
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__ br(Assembler::NE, slowpath);
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BLOCK_COMMENT("} ZBarrierSetAssembler::try_resolve_jobject_in_native");
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}
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#ifdef COMPILER1
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#undef __
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#define __ ce->masm()->
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void ZBarrierSetAssembler::generate_c1_load_barrier_test(LIR_Assembler* ce,
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LIR_Opr ref) const {
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assert_different_registers(rheapbase, rthread, ref->as_register());
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__ ldr(rheapbase, address_bad_mask_from_thread(rthread));
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__ tst(ref->as_register(), rheapbase);
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}
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void ZBarrierSetAssembler::generate_c1_load_barrier_stub(LIR_Assembler* ce,
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ZLoadBarrierStubC1* stub) const {
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// Stub entry
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__ bind(*stub->entry());
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Register ref = stub->ref()->as_register();
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Register ref_addr = noreg;
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Register tmp = noreg;
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if (stub->tmp()->is_valid()) {
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// Load address into tmp register
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ce->leal(stub->ref_addr(), stub->tmp());
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ref_addr = tmp = stub->tmp()->as_pointer_register();
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} else {
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// Address already in register
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ref_addr = stub->ref_addr()->as_address_ptr()->base()->as_pointer_register();
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}
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assert_different_registers(ref, ref_addr, noreg);
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// Save r0 unless it is the result or tmp register
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// Set up SP to accomodate parameters and maybe r0..
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if (ref != r0 && tmp != r0) {
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__ sub(sp, sp, 32);
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__ str(r0, Address(sp, 16));
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} else {
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__ sub(sp, sp, 16);
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}
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// Setup arguments and call runtime stub
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ce->store_parameter(ref_addr, 1);
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ce->store_parameter(ref, 0);
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__ far_call(stub->runtime_stub());
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// Verify result
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__ verify_oop(r0, "Bad oop");
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// Move result into place
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if (ref != r0) {
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__ mov(ref, r0);
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}
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// Restore r0 unless it is the result or tmp register
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if (ref != r0 && tmp != r0) {
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__ ldr(r0, Address(sp, 16));
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__ add(sp, sp, 32);
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} else {
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__ add(sp, sp, 16);
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}
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// Stub exit
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__ b(*stub->continuation());
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}
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#undef __
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#define __ sasm->
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void ZBarrierSetAssembler::generate_c1_load_barrier_runtime_stub(StubAssembler* sasm,
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DecoratorSet decorators) const {
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__ prologue("zgc_load_barrier stub", false);
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// We don't use push/pop_clobbered_registers() - we need to pull out the result from r0.
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for (int i = 0; i < 32; i += 2) {
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__ stpd(as_FloatRegister(i), as_FloatRegister(i + 1), Address(__ pre(sp,-16)));
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}
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const RegSet save_regs = RegSet::range(r1, r28);
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__ push(save_regs, sp);
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// Setup arguments
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__ load_parameter(0, c_rarg0);
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__ load_parameter(1, c_rarg1);
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__ call_VM_leaf(ZBarrierSetRuntime::load_barrier_on_oop_field_preloaded_addr(decorators), 2);
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__ pop(save_regs, sp);
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for (int i = 30; i >= 0; i -= 2) {
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__ ldpd(as_FloatRegister(i), as_FloatRegister(i + 1), Address(__ post(sp, 16)));
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}
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__ epilogue();
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}
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#endif // COMPILER1
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#ifdef COMPILER2
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OptoReg::Name ZBarrierSetAssembler::refine_register(const Node* node, OptoReg::Name opto_reg) {
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if (!OptoReg::is_reg(opto_reg)) {
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return OptoReg::Bad;
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}
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const VMReg vm_reg = OptoReg::as_VMReg(opto_reg);
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if (vm_reg->is_FloatRegister()) {
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return opto_reg & ~1;
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}
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return opto_reg;
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}
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#undef __
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#define __ _masm->
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class ZSaveLiveRegisters {
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private:
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MacroAssembler* const _masm;
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RegSet _gp_regs;
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RegSet _fp_regs;
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public:
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void initialize(ZLoadBarrierStubC2* stub) {
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// Create mask of live registers
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RegMask live = stub->live();
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// Record registers that needs to be saved/restored
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while (live.is_NotEmpty()) {
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const OptoReg::Name opto_reg = live.find_first_elem();
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live.Remove(opto_reg);
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if (OptoReg::is_reg(opto_reg)) {
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const VMReg vm_reg = OptoReg::as_VMReg(opto_reg);
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if (vm_reg->is_Register()) {
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_gp_regs += RegSet::of(vm_reg->as_Register());
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} else if (vm_reg->is_FloatRegister()) {
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_fp_regs += RegSet::of((Register)vm_reg->as_FloatRegister());
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} else {
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fatal("Unknown register type");
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}
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}
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}
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// Remove C-ABI SOE registers, scratch regs and _ref register that will be updated
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_gp_regs -= RegSet::range(r19, r30) + RegSet::of(r8, r9, stub->ref());
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}
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ZSaveLiveRegisters(MacroAssembler* masm, ZLoadBarrierStubC2* stub) :
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_masm(masm),
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_gp_regs(),
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_fp_regs() {
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// Figure out what registers to save/restore
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initialize(stub);
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// Save registers
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__ push(_gp_regs, sp);
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__ push_fp(_fp_regs, sp);
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}
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~ZSaveLiveRegisters() {
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// Restore registers
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__ pop_fp(_fp_regs, sp);
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__ pop(_gp_regs, sp);
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}
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};
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#undef __
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#define __ _masm->
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class ZSetupArguments {
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private:
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MacroAssembler* const _masm;
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const Register _ref;
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const Address _ref_addr;
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public:
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ZSetupArguments(MacroAssembler* masm, ZLoadBarrierStubC2* stub) :
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_masm(masm),
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_ref(stub->ref()),
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_ref_addr(stub->ref_addr()) {
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// Setup arguments
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if (_ref_addr.base() == noreg) {
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// No self healing
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if (_ref != c_rarg0) {
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410 |
__ mov(c_rarg0, _ref);
|
|
411 |
}
|
|
412 |
__ mov(c_rarg1, 0);
|
|
413 |
} else {
|
|
414 |
// Self healing
|
|
415 |
if (_ref == c_rarg0) {
|
|
416 |
// _ref is already at correct place
|
|
417 |
__ lea(c_rarg1, _ref_addr);
|
|
418 |
} else if (_ref != c_rarg1) {
|
|
419 |
// _ref is in wrong place, but not in c_rarg1, so fix it first
|
|
420 |
__ lea(c_rarg1, _ref_addr);
|
|
421 |
__ mov(c_rarg0, _ref);
|
|
422 |
} else if (_ref_addr.base() != c_rarg0 && _ref_addr.index() != c_rarg0) {
|
|
423 |
assert(_ref == c_rarg1, "Mov ref first, vacating c_rarg0");
|
|
424 |
__ mov(c_rarg0, _ref);
|
|
425 |
__ lea(c_rarg1, _ref_addr);
|
|
426 |
} else {
|
|
427 |
assert(_ref == c_rarg1, "Need to vacate c_rarg1 and _ref_addr is using c_rarg0");
|
|
428 |
if (_ref_addr.base() == c_rarg0 || _ref_addr.index() == c_rarg0) {
|
|
429 |
__ mov(rscratch2, c_rarg1);
|
|
430 |
__ lea(c_rarg1, _ref_addr);
|
|
431 |
__ mov(c_rarg0, rscratch2);
|
|
432 |
} else {
|
|
433 |
ShouldNotReachHere();
|
|
434 |
}
|
|
435 |
}
|
|
436 |
}
|
|
437 |
}
|
|
438 |
|
|
439 |
~ZSetupArguments() {
|
|
440 |
// Transfer result
|
|
441 |
if (_ref != r0) {
|
|
442 |
__ mov(_ref, r0);
|
|
443 |
}
|
|
444 |
}
|
|
445 |
};
|
|
446 |
|
|
447 |
#undef __
|
|
448 |
#define __ masm->
|
|
449 |
|
|
450 |
void ZBarrierSetAssembler::generate_c2_load_barrier_stub(MacroAssembler* masm, ZLoadBarrierStubC2* stub) const {
|
|
451 |
BLOCK_COMMENT("ZLoadBarrierStubC2");
|
|
452 |
|
|
453 |
// Stub entry
|
|
454 |
__ bind(*stub->entry());
|
|
455 |
|
|
456 |
{
|
|
457 |
ZSaveLiveRegisters save_live_registers(masm, stub);
|
|
458 |
ZSetupArguments setup_arguments(masm, stub);
|
|
459 |
__ mov(rscratch1, stub->slow_path());
|
|
460 |
__ blr(rscratch1);
|
|
461 |
}
|
|
462 |
|
|
463 |
// Stub exit
|
|
464 |
__ b(*stub->continuation());
|
|
465 |
}
|
|
466 |
|
|
467 |
#undef __
|
|
468 |
|
|
469 |
#endif // COMPILER2
|