< prev index next > src/hotspot/cpu/arm/gc/g1/g1BarrierSetAssembler_arm.cpp
BarrierSetC1
#if R9_IS_SCRATCHED
__ pop(R9);
#endif // !R9_IS_SCRATCHED
#endif // !AARCH64
}
+
+#undef __
+#define __ ce->masm()->
+
+void G1BarrierSetAssembler::gen_g1_pre_barrier_stub(LIR_Assembler* ce, G1PreBarrierStub* stub) {
+ // At this point we know that marking is in progress.
+ // If do_load() is true then we have to emit the
+ // load of the previous value; otherwise it has already
+ // been loaded into _pre_val.
+
+ __ bind(*stub->entry());
+ assert(stub->pre_val()->is_register(), "Precondition.");
+
+ Register pre_val_reg = stub->pre_val()->as_register();
+
+ if (stub->do_load()) {
+ ce->mem2reg(stub->addr(), stub->pre_val(), T_OBJECT, stub->patch_code(), stub->info(), false /*wide*/, false /*unaligned*/);
+ }
+
+ __ cbz(pre_val_reg, *stub->continuation());
+ ce->verify_reserved_argument_area_size(1);
+ __ str(pre_val_reg, Address(SP));
+ __ call(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id), relocInfo::runtime_call_type);
+
+ __ b(*stub->continuation());
+}
+
+void G1BarrierSetAssembler::gen_g1_post_barrier_stub(LIR_Assembler* ce, G1PostBarrierStub* stub) {
+ __ bind(*stub->entry());
+ assert(stub->addr()->is_register(), "Precondition.");
+ assert(stub->new_val()->is_register(), "Precondition.");
+ Register new_val_reg = stub->new_val()->as_register();
+ __ cbz(new_val_reg, *stub->continuation());
+ ce->verify_reserved_argument_area_size(1);
+ __ str(stub->addr()->as_pointer_register(), Address(SP));
+ __ call(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id), relocInfo::runtime_call_type);
+ __ b(*stub->continuation());
+}
+
+#undef __
+#define __ sasm->
+
+void G1BarrierSetAssembler::generate_c1_pre_barrier_runtime_stub(StubAssembler* sasm) {
+ // Input:
+ // - pre_val pushed on the stack
+
+ __ set_info("g1_pre_barrier_slow_id", dont_gc_arguments);
+
+ BarrierSet* bs = BarrierSet::barrier_set();
+ if (bs->kind() != BarrierSet::G1BarrierSet) {
+ __ mov(R0, (int)id);
+ __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), R0);
+ __ should_not_reach_here();
+ break;
+ }
+
+ // save at least the registers that need saving if the runtime is called
+#ifdef AARCH64
+ __ raw_push(R0, R1);
+ __ raw_push(R2, R3);
+ const int nb_saved_regs = 4;
+#else // AARCH64
+ const RegisterSet saved_regs = RegisterSet(R0,R3) | RegisterSet(R12) | RegisterSet(LR);
+ const int nb_saved_regs = 6;
+ assert(nb_saved_regs == saved_regs.size(), "fix nb_saved_regs");
+ __ push(saved_regs);
+#endif // AARCH64
+
+ const Register r_pre_val_0 = R0; // must be R0, to be ready for the runtime call
+ const Register r_index_1 = R1;
+ const Register r_buffer_2 = R2;
+
+ Address queue_active(Rthread, in_bytes(G1ThreadLocalData::satb_mark_queue_active_offset()));
+ Address queue_index(Rthread, in_bytes(G1ThreadLocalData::satb_mark_queue_index_offset()));
+ Address buffer(Rthread, in_bytes(G1ThreadLocalData::satb_mark_queue_buffer_offset()));
+
+ Label done;
+ Label runtime;
+
+ // Is marking still active?
+ assert(in_bytes(SATBMarkQueue::byte_width_of_active()) == 1, "Assumption");
+ __ ldrb(R1, queue_active);
+ __ cbz(R1, done);
+
+ __ ldr(r_index_1, queue_index);
+ __ ldr(r_pre_val_0, Address(SP, nb_saved_regs*wordSize));
+ __ ldr(r_buffer_2, buffer);
+
+ __ subs(r_index_1, r_index_1, wordSize);
+ __ b(runtime, lt);
+
+ __ str(r_index_1, queue_index);
+ __ str(r_pre_val_0, Address(r_buffer_2, r_index_1));
+
+ __ bind(done);
+
+#ifdef AARCH64
+ __ raw_pop(R2, R3);
+ __ raw_pop(R0, R1);
+#else // AARCH64
+ __ pop(saved_regs);
+#endif // AARCH64
+
+ __ ret();
+
+ __ bind(runtime);
+
+ __ save_live_registers();
+
+ assert(r_pre_val_0 == c_rarg0, "pre_val should be in R0");
+ __ mov(c_rarg1, Rthread);
+ __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), c_rarg0, c_rarg1);
+
+ __ restore_live_registers_without_return();
+
+ __ b(done);
+}
+
+void G1BarrierSetAssembler::generate_c1_post_barrier_runtime_stub(StubAssembler* sasm) {
+ // Input:
+ // - store_addr, pushed on the stack
+
+ __ set_info("g1_post_barrier_slow_id", dont_gc_arguments);
+
+ BarrierSet* bs = BarrierSet::barrier_set();
+ if (bs->kind() != BarrierSet::G1BarrierSet) {
+ __ mov(R0, (int)id);
+ __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), R0);
+ __ should_not_reach_here();
+ break;
+ }
+
+ Label done;
+ Label recheck;
+ Label runtime;
+
+ Address queue_index(Rthread, in_bytes(G1ThreadLocalData::dirty_card_queue_index_offset()));
+ Address buffer(Rthread, in_bytes(G1ThreadLocalData::dirty_card_queue_buffer_offset()));
+
+ AddressLiteral cardtable(ci_card_table_address_as<address>(), relocInfo::none);
+
+ // save at least the registers that need saving if the runtime is called
+#ifdef AARCH64
+ __ raw_push(R0, R1);
+ __ raw_push(R2, R3);
+ const int nb_saved_regs = 4;
+#else // AARCH64
+ const RegisterSet saved_regs = RegisterSet(R0,R3) | RegisterSet(R12) | RegisterSet(LR);
+ const int nb_saved_regs = 6;
+ assert(nb_saved_regs == saved_regs.size(), "fix nb_saved_regs");
+ __ push(saved_regs);
+#endif // AARCH64
+
+ const Register r_card_addr_0 = R0; // must be R0 for the slow case
+ const Register r_obj_0 = R0;
+ const Register r_card_base_1 = R1;
+ const Register r_tmp2 = R2;
+ const Register r_index_2 = R2;
+ const Register r_buffer_3 = R3;
+ const Register tmp1 = Rtemp;
+
+ __ ldr(r_obj_0, Address(SP, nb_saved_regs*wordSize));
+ // Note: there is a comment in x86 code about not using
+ // ExternalAddress / lea, due to relocation not working
+ // properly for that address. Should be OK for arm, where we
+ // explicitly specify that 'cardtable' has a relocInfo::none
+ // type.
+ __ lea(r_card_base_1, cardtable);
+ __ add(r_card_addr_0, r_card_base_1, AsmOperand(r_obj_0, lsr, CardTable::card_shift));
+
+ // first quick check without barrier
+ __ ldrb(r_tmp2, Address(r_card_addr_0));
+
+ __ cmp(r_tmp2, (int)G1CardTable::g1_young_card_val());
+ __ b(recheck, ne);
+
+ __ bind(done);
+
+#ifdef AARCH64
+ __ raw_pop(R2, R3);
+ __ raw_pop(R0, R1);
+#else // AARCH64
+ __ pop(saved_regs);
+#endif // AARCH64
+
+ __ ret();
+
+ __ bind(recheck);
+
+ __ membar(MacroAssembler::Membar_mask_bits(MacroAssembler::StoreLoad), tmp1);
+
+ // reload card state after the barrier that ensures the stored oop was visible
+ __ ldrb(r_tmp2, Address(r_card_addr_0));
+
+ assert(CardTable::dirty_card_val() == 0, "adjust this code");
+ __ cbz(r_tmp2, done);
+
+ // storing region crossing non-NULL, card is clean.
+ // dirty card and log.
+
+ assert(0 == (int)CardTable::dirty_card_val(), "adjust this code");
+ if ((ci_card_table_address_as<intptr_t>() & 0xff) == 0) {
+ // Card table is aligned so the lowest byte of the table address base is zero.
+ __ strb(r_card_base_1, Address(r_card_addr_0));
+ } else {
+ __ strb(__ zero_register(r_tmp2), Address(r_card_addr_0));
+ }
+
+ __ ldr(r_index_2, queue_index);
+ __ ldr(r_buffer_3, buffer);
+
+ __ subs(r_index_2, r_index_2, wordSize);
+ __ b(runtime, lt); // go to runtime if now negative
+
+ __ str(r_index_2, queue_index);
+
+ __ str(r_card_addr_0, Address(r_buffer_3, r_index_2));
+
+ __ b(done);
+
+ __ bind(runtime);
+
+ __ save_live_registers();
+
+ assert(r_card_addr_0 == c_rarg0, "card_addr should be in R0");
+ __ mov(c_rarg1, Rthread);
+ __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_post), c_rarg0, c_rarg1);
+
+ __ restore_live_registers_without_return();
+
+ __ b(done);
+}
+
+#undef __
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