1 /*

     2  * Copyright (c) 2015, 2017, 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 "jvmci/jvmciCodeInstaller.hpp"

    25 #include "jvmci/jvmciRuntime.hpp"

    26 #include "jvmci/jvmciCompilerToVM.hpp"

    27 #include "jvmci/jvmciJavaClasses.hpp"

    28 #include "oops/oop.inline.hpp"

    29 #include "runtime/sharedRuntime.hpp"

    30 #include "vmreg_aarch64.inline.hpp"

    31 

    32 jint CodeInstaller::pd_next_offset(NativeInstruction* inst, jint pc_offset, Handle method, TRAPS) {

    33   if (inst->is_call() || inst->is_jump() || inst->is_blr()) {

    34     return pc_offset + NativeCall::instruction_size;

    35   } else if (inst->is_general_jump()) {

    36     return pc_offset + NativeGeneralJump::instruction_size;

    37   } else {

    38     JVMCI_ERROR_0("unsupported type of instruction for call site");

    39   }

    40 }

    41 

    42 void CodeInstaller::pd_patch_OopConstant(int pc_offset, Handle constant, TRAPS) {

    43   address pc = _instructions->start() + pc_offset;

    44 #ifdef ASSERT

    45   {

    46     NativeInstruction *insn = nativeInstruction_at(pc);

    47     if (HotSpotObjectConstantImpl::compressed(constant)) {

    48       // Mov narrow constant: movz n << 16, movk

    49       assert(Instruction_aarch64::extract(insn->encoding(), 31, 21) == 0b11010010101 &&

    50              nativeInstruction_at(pc+4)->is_movk(), "wrong insn in patch");

    51     } else {

    52       // Move wide constant: movz n, movk, movk.

    53       assert(nativeInstruction_at(pc+4)->is_movk()

    54              && nativeInstruction_at(pc+8)->is_movk(), "wrong insn in patch");

    55     }

    56   }

    57 #endif // ASSERT

    58   Handle obj(THREAD, HotSpotObjectConstantImpl::object(constant));

    59   jobject value = JNIHandles::make_local(obj());

    60   MacroAssembler::patch_oop(pc, (address)obj());

    61   int oop_index = _oop_recorder->find_index(value);

    62   RelocationHolder rspec = oop_Relocation::spec(oop_index);

    63   _instructions->relocate(pc, rspec);

    64 }

    65 

    66 void CodeInstaller::pd_patch_MetaspaceConstant(int pc_offset, Handle constant, TRAPS) {

    67   address pc = _instructions->start() + pc_offset;

    68   if (HotSpotMetaspaceConstantImpl::compressed(constant)) {

    69     narrowKlass narrowOop = record_narrow_metadata_reference(_instructions, pc, constant, CHECK);

    70     MacroAssembler::patch_narrow_klass(pc, narrowOop);

    71     TRACE_jvmci_3("relocating (narrow metaspace constant) at " PTR_FORMAT "/0x%x", p2i(pc), narrowOop);

    72   } else {

    73     NativeMovConstReg* move = nativeMovConstReg_at(pc);

    74     void* reference = record_metadata_reference(_instructions, pc, constant, CHECK);

    75     move->set_data((intptr_t) reference);

    76     TRACE_jvmci_3("relocating (metaspace constant) at " PTR_FORMAT "/" PTR_FORMAT, p2i(pc), p2i(reference));

    77   }

    78 }

    79 

    80 void CodeInstaller::pd_patch_DataSectionReference(int pc_offset, int data_offset, TRAPS) {

    81   address pc = _instructions->start() + pc_offset;

    82   NativeInstruction* inst = nativeInstruction_at(pc);

    83   if (inst->is_adr_aligned() || inst->is_ldr_literal()) {

    84     address dest = _constants->start() + data_offset;

    85     _instructions->relocate(pc, section_word_Relocation::spec((address) dest, CodeBuffer::SECT_CONSTS));

    86     TRACE_jvmci_3("relocating at " PTR_FORMAT " (+%d) with destination at %d", p2i(pc), pc_offset, data_offset);

    87   } else {

    88     JVMCI_ERROR("unknown load or move instruction at " PTR_FORMAT, p2i(pc));

    89   }

    90 }

    91 

    92 void CodeInstaller::pd_relocate_ForeignCall(NativeInstruction* inst, jlong foreign_call_destination, TRAPS) {

    93   address pc = (address) inst;

    94   if (inst->is_call()) {

    95     NativeCall* call = nativeCall_at(pc);

    96     call->set_destination((address) foreign_call_destination);

    97     _instructions->relocate(call->instruction_address(), runtime_call_Relocation::spec());

    98   } else if (inst->is_jump()) {

    99     NativeJump* jump = nativeJump_at(pc);

   100     jump->set_jump_destination((address) foreign_call_destination);

   101     _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec());

   102   } else if (inst->is_general_jump()) {

   103     NativeGeneralJump* jump = nativeGeneralJump_at(pc);

   104     jump->set_jump_destination((address) foreign_call_destination);

   105     _instructions->relocate(jump->instruction_address(), runtime_call_Relocation::spec());

   106   } else {

   107     JVMCI_ERROR("unknown call or jump instruction at " PTR_FORMAT, p2i(pc));

   108   }

   109   TRACE_jvmci_3("relocating (foreign call) at " PTR_FORMAT, p2i(inst));

   110 }

   111 

   112 void CodeInstaller::pd_relocate_JavaMethod(Handle hotspot_method, jint pc_offset, TRAPS) {

   113 #ifdef ASSERT

   114   Method* method = NULL;

   115   // we need to check, this might also be an unresolved method

   116   if (hotspot_method->is_a(HotSpotResolvedJavaMethodImpl::klass())) {

   117     method = getMethodFromHotSpotMethod(hotspot_method());

   118   }

   119 #endif

   120   switch (_next_call_type) {

   121     case INLINE_INVOKE:

   122       break;

   123     case INVOKEVIRTUAL:

   124     case INVOKEINTERFACE: {

   125       assert(method == NULL || !method->is_static(), "cannot call static method with invokeinterface");

   126       NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

   127       call->set_destination(SharedRuntime::get_resolve_virtual_call_stub());

   128       _instructions->relocate(call->instruction_address(), virtual_call_Relocation::spec(_invoke_mark_pc));

   129       break;

   130     }

   131     case INVOKESTATIC: {

   132       assert(method == NULL || method->is_static(), "cannot call non-static method with invokestatic");

   133       NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

   134       call->set_destination(SharedRuntime::get_resolve_static_call_stub());

   135       _instructions->relocate(call->instruction_address(), relocInfo::static_call_type);

   136       break;

   137     }

   138     case INVOKESPECIAL: {

   139       assert(method == NULL || !method->is_static(), "cannot call static method with invokespecial");

   140       NativeCall* call = nativeCall_at(_instructions->start() + pc_offset);

   141       call->set_destination(SharedRuntime::get_resolve_opt_virtual_call_stub());

   142       _instructions->relocate(call->instruction_address(), relocInfo::opt_virtual_call_type);

   143       break;

   144     }

   145     default:

   146       JVMCI_ERROR("invalid _next_call_type value");

   147       break;

   148   }

   149 }

   150 

   151 void CodeInstaller::pd_relocate_poll(address pc, jint mark, TRAPS) {

   152   switch (mark) {

   153     case POLL_NEAR:

   154       JVMCI_ERROR("unimplemented");

   155       break;

   156     case POLL_FAR:

   157       _instructions->relocate(pc, relocInfo::poll_type);

   158       break;

   159     case POLL_RETURN_NEAR:

   160       JVMCI_ERROR("unimplemented");

   161       break;

   162     case POLL_RETURN_FAR:

   163       _instructions->relocate(pc, relocInfo::poll_return_type);

   164       break;

   165     default:

   166       JVMCI_ERROR("invalid mark value");

   167       break;

   168   }

   169 }

   170 

   171 // convert JVMCI register indices (as used in oop maps) to HotSpot registers

   172 VMReg CodeInstaller::get_hotspot_reg(jint jvmci_reg, TRAPS) {

   173   if (jvmci_reg < RegisterImpl::number_of_registers) {

   174     return as_Register(jvmci_reg)->as_VMReg();

   175   } else {

   176     jint floatRegisterNumber = jvmci_reg - RegisterImpl::number_of_registers_for_jvmci;

   177     if (floatRegisterNumber >= 0 && floatRegisterNumber < FloatRegisterImpl::number_of_registers) {

   178       return as_FloatRegister(floatRegisterNumber)->as_VMReg();

   179     }

   180     JVMCI_ERROR_NULL("invalid register number: %d", jvmci_reg);

   181   }

   182 }

   183 

   184 bool CodeInstaller::is_general_purpose_reg(VMReg hotspotRegister) {

   185   return !hotspotRegister->is_FloatRegister();

   186 }