1 /*
2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 #include "precompiled.hpp"
25 #include "compiler/disassembler.hpp"
26 #include "oops/oop.inline.hpp"
27 #include "runtime/javaCalls.hpp"
28 #include "runtime/sharedRuntime.hpp"
29 #include "jvmci/jvmciEnv.hpp"
30 #include "jvmci/jvmciCodeInstaller.hpp"
31 #include "jvmci/jvmciJavaClasses.hpp"
32 #include "jvmci/jvmciCompilerToVM.hpp"
33 #include "jvmci/jvmciRuntime.hpp"
34 #include "asm/register.hpp"
35 #include "classfile/vmSymbols.hpp"
36 #include "code/vmreg.hpp"
37 #include "vmreg_x86.inline.hpp"
38
39 jint CodeInstaller::pd_next_offset(NativeInstruction* inst, jint pc_offset, oop method) {
40 if (inst->is_call() || inst->is_jump()) {
41 assert(NativeCall::instruction_size == (int)NativeJump::instruction_size, "unexpected size");
42 return (pc_offset + NativeCall::instruction_size);
43 } else if (inst->is_mov_literal64()) {
44 // mov+call instruction pair
45 jint offset = pc_offset + NativeMovConstReg::instruction_size;
46 u_char* call = (u_char*) (_instructions->start() + offset);
47 if (call[0] == Assembler::REX_B) {
48 offset += 1; /* prefix byte for extended register R8-R15 */
49 call++;
50 }
51 assert(call[0] == 0xFF, "expected call");
52 offset += 2; /* opcode byte + modrm byte */
53 return (offset);
54 } else if (inst->is_call_reg()) {
55 // the inlined vtable stub contains a "call register" instruction
56 assert(method != NULL, "only valid for virtual calls");
57 return (pc_offset + ((NativeCallReg *) inst)->next_instruction_offset());
58 } else if (inst->is_cond_jump()) {
59 address pc = (address) (inst);
60 return pc_offset + (jint) (Assembler::locate_next_instruction(pc) - pc);
61 } else {
62 fatal("unsupported type of instruction for call site");
63 return 0;
64 }
65 }
66
67 void CodeInstaller::pd_patch_OopConstant(int pc_offset, Handle& constant) {
68 address pc = _instructions->start() + pc_offset;
69 Handle obj = HotSpotObjectConstantImpl::object(constant);
70 jobject value = JNIHandles::make_local(obj());
71 if (HotSpotObjectConstantImpl::compressed(constant)) {
72 #ifdef _LP64
73 address operand = Assembler::locate_operand(pc, Assembler::narrow_oop_operand);
74 int oop_index = _oop_recorder->find_index(value);
75 _instructions->relocate(pc, oop_Relocation::spec(oop_index), Assembler::narrow_oop_operand);
76 TRACE_jvmci_3("relocating (narrow oop constant) at " PTR_FORMAT "/" PTR_FORMAT, p2i(pc), p2i(operand));
77 #else
78 fatal("compressed oop on 32bit");
79 #endif
80 } else {
81 address operand = Assembler::locate_operand(pc, Assembler::imm_operand);
82 *((jobject*) operand) = value;
83 _instructions->relocate(pc, oop_Relocation::spec_for_immediate(), Assembler::imm_operand);
84 TRACE_jvmci_3("relocating (oop constant) at " PTR_FORMAT "/" PTR_FORMAT, p2i(pc), p2i(operand));
85 }
86 }
87
88 void CodeInstaller::pd_patch_DataSectionReference(int pc_offset, int data_offset) {
89 address pc = _instructions->start() + pc_offset;
90
91 address operand = Assembler::locate_operand(pc, Assembler::disp32_operand);
92 address next_instruction = Assembler::locate_next_instruction(pc);
93 address dest = _constants->start() + data_offset;
94
95 long disp = dest - next_instruction;
96 assert(disp == (jint) disp, "disp doesn't fit in 32 bits");
97 *((jint*) operand) = (jint) disp;
98
99 _instructions->relocate(pc, section_word_Relocation::spec((address) dest, CodeBuffer::SECT_CONSTS), Assembler::disp32_operand);
100 TRACE_jvmci_3("relocating at " PTR_FORMAT "/" PTR_FORMAT " with destination at " PTR_FORMAT " (%d)", p2i(pc), p2i(operand), p2i(dest), data_offset);
101 }
102
103 void CodeInstaller::pd_relocate_CodeBlob(CodeBlob* cb, NativeInstruction* inst) {
104 if (cb->is_nmethod()) {
105 nmethod* nm = (nmethod*) cb;
106 nativeJump_at((address)inst)->set_jump_destination(nm->verified_entry_point());
107 } else {
108 nativeJump_at((address)inst)->set_jump_destination(cb->code_begin());
109 }
110 _instructions->relocate((address)inst, runtime_call_Relocation::spec(), Assembler::call32_operand);
111 }
112
113 void CodeInstaller::pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination) {
114 address pc = (address) inst;
115 if (inst->is_call()) {
116 // NOTE: for call without a mov, the offset must fit a 32-bit immediate
117 // see also CompilerToVM.getMaxCallTargetOffset()
118 NativeCall* call = nativeCall_at(pc);
119 call->set_destination((address) foreign_call_destination);
120 _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand);
121 } else if (inst->is_mov_literal64()) {
122 NativeMovConstReg* mov = nativeMovConstReg_at(pc);
123 mov->set_data((intptr_t) foreign_call_destination);
124 _instructions->relocate(mov->instruction_address(), runtime_call_Relocation::spec(), Assembler::imm_operand);
125 } else if (inst->is_jump()) {
126 NativeJump* jump = nativeJump_at(pc);
127 jump->set_jump_destination((address) foreign_call_destination);
128 _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec(), Assembler::call32_operand);
129 } else if (inst->is_cond_jump()) {
130 address old_dest = nativeGeneralJump_at(pc)->jump_destination();
131 address disp = Assembler::locate_operand(pc, Assembler::call32_operand);
132 *(jint*) disp += ((address) foreign_call_destination) - old_dest;
133 _instructions->relocate(pc, runtime_call_Relocation::spec(), Assembler::call32_operand);
134 } else {
135 fatal("unsupported relocation for foreign call");
136 }
137
138 TRACE_jvmci_3("relocating (foreign call) at " PTR_FORMAT, p2i(inst));
139 }
140
141 void CodeInstaller::pd_relocate_JavaMethod(oop hotspot_method, jint pc_offset) {
142 #ifdef ASSERT
143 Method* method = NULL;
144 // we need to check, this might also be an unresolved method
145 if (hotspot_method->is_a(HotSpotResolvedJavaMethodImpl::klass())) {
146 method = getMethodFromHotSpotMethod(hotspot_method);
147 }
148 #endif
149 switch (_next_call_type) {
150 case INLINE_INVOKE:
151 break;
152 case INVOKEVIRTUAL:
153 case INVOKEINTERFACE: {
154 assert(method == NULL || !method->is_static(), "cannot call static method with invokeinterface");
155
156 NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);
157 call->set_destination(SharedRuntime::get_resolve_virtual_call_stub());
158 _instructions->relocate(call->instruction_address(),
159 virtual_call_Relocation::spec(_invoke_mark_pc),
160 Assembler::call32_operand);
161 break;
162 }
163 case INVOKESTATIC: {
164 assert(method == NULL || method->is_static(), "cannot call non-static method with invokestatic");
165
166 NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);
167 call->set_destination(SharedRuntime::get_resolve_static_call_stub());
168 _instructions->relocate(call->instruction_address(),
169 relocInfo::static_call_type, Assembler::call32_operand);
170 break;
171 }
172 case INVOKESPECIAL: {
173 assert(method == NULL || !method->is_static(), "cannot call static method with invokespecial");
174 NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);
175 call->set_destination(SharedRuntime::get_resolve_opt_virtual_call_stub());
176 _instructions->relocate(call->instruction_address(),
177 relocInfo::opt_virtual_call_type, Assembler::call32_operand);
178 break;
179 }
180 default:
181 break;
182 }
183 }
184
185 static void relocate_poll_near(address pc) {
186 NativeInstruction* ni = nativeInstruction_at(pc);
187 int32_t* disp = (int32_t*) Assembler::locate_operand(pc, Assembler::disp32_operand);
188 int32_t offset = *disp; // The Java code installed the polling page offset into the disp32 operand
189 intptr_t new_disp = (intptr_t) (os::get_polling_page() + offset) - (intptr_t) ni;
190 *disp = (int32_t)new_disp;
191 }
192
193
194 void CodeInstaller::pd_relocate_poll(address pc, jint mark) {
195 switch (mark) {
196 case POLL_NEAR: {
197 relocate_poll_near(pc);
198 _instructions->relocate(pc, relocInfo::poll_type, Assembler::disp32_operand);
199 break;
200 }
201 case POLL_FAR:
202 // This is a load from a register so there is no relocatable operand.
203 // We just have to ensure that the format is not disp32_operand
204 // so that poll_Relocation::fix_relocation_after_move does the right
205 // thing (i.e. ignores this relocation record)
206 _instructions->relocate(pc, relocInfo::poll_type, Assembler::imm_operand);
207 break;
208 case POLL_RETURN_NEAR: {
209 relocate_poll_near(pc);
210 _instructions->relocate(pc, relocInfo::poll_return_type, Assembler::disp32_operand);
211 break;
212 }
213 case POLL_RETURN_FAR:
214 // see comment above for POLL_FAR
215 _instructions->relocate(pc, relocInfo::poll_return_type, Assembler::imm_operand);
216 break;
217 default:
218 fatal("invalid mark value");
219 break;
220 }
221 }
222
223 // convert JVMCI register indices (as used in oop maps) to HotSpot registers
224 VMReg CodeInstaller::get_hotspot_reg(jint jvmci_reg) {
225 if (jvmci_reg < RegisterImpl::number_of_registers) {
226 return as_Register(jvmci_reg)->as_VMReg();
227 } else {
228 jint floatRegisterNumber = jvmci_reg - RegisterImpl::number_of_registers;
229 if (floatRegisterNumber < XMMRegisterImpl::number_of_registers) {
230 return as_XMMRegister(floatRegisterNumber)->as_VMReg();
231 }
232 ShouldNotReachHere();
233 return NULL;
234 }
235 }
236
237 bool CodeInstaller::is_general_purpose_reg(VMReg hotspotRegister) {
238 return !(hotspotRegister->is_FloatRegister() || hotspotRegister->is_XMMRegister());
239 }