jvmciCodeInstaller_x86.cpp revision 9111:a41fe5ffa839 
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
39jint 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
67void 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
88void 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
103void 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
113void 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
141void 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
185static 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
194void 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
224VMReg 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
237bool CodeInstaller::is_general_purpose_reg(VMReg hotspotRegister) {
238  return !(hotspotRegister->is_FloatRegister() || hotspotRegister->is_XMMRegister());
239}
240