1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "code/icBuffer.hpp"
29 #include "gc/shared/collectedHeap.inline.hpp"
30 #include "interpreter/bytecodes.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "nativeInst_s390.hpp"
33 #include "oops/oop.inline.hpp"
34
35 #define __ masm.
36
ic_stub_code_size()37 int InlineCacheBuffer::ic_stub_code_size() {
38 return MacroAssembler::load_const_size() + Assembler::z_brul_size();
39 }
40
assemble_ic_buffer_code(address code_begin,void * cached_oop,address entry_point)41 void InlineCacheBuffer::assemble_ic_buffer_code(address code_begin, void* cached_oop, address entry_point) {
42 ResourceMark rm;
43 CodeBuffer code(code_begin, ic_stub_code_size());
44 MacroAssembler masm(&code);
45 // Note: even though the code contains an embedded oop, we do not need reloc info
46 // because
47 // (1) the oop is old (i.e., doesn't matter for scavenges)
48 // (2) these ICStubs are removed *before* a GC happens, so the roots disappear.
49
50 // Load the oop,
51 __ load_const(Z_method, (address) cached_oop); // inline cache reg = Z_method
52 // and do a tail-call (pc-relative).
53 __ z_brul((address) entry_point);
54 __ flush();
55 }
56
ic_buffer_entry_point(address code_begin)57 address InlineCacheBuffer::ic_buffer_entry_point(address code_begin) {
58 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // Creation also verifies the object.
59 return MacroAssembler::get_target_addr_pcrel(move->next_instruction_address());
60 }
61
ic_buffer_cached_value(address code_begin)62 void* InlineCacheBuffer::ic_buffer_cached_value(address code_begin) {
63 NativeMovConstReg* move = nativeMovConstReg_at(code_begin); // Creation also verifies the object.
64 return (void*)move->data();
65 }
66