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 }