1 /*
2 * Copyright (c) 1998, 2013, 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
25 #include "precompiled.hpp"
26 #include "asm/macroAssembler.hpp"
27 #include "code/relocInfo.hpp"
28 #include "nativeInst_x86.hpp"
29 #include "oops/klass.inline.hpp"
30 #include "oops/oop.inline.hpp"
31 #include "runtime/safepoint.hpp"
32
33
34 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) {
35 #ifdef AMD64
36 x += o;
37 typedef Assembler::WhichOperand WhichOperand;
38 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop
39 assert(which == Assembler::disp32_operand ||
40 which == Assembler::narrow_oop_operand ||
41 which == Assembler::imm_operand, "format unpacks ok");
42 if (which == Assembler::imm_operand) {
43 if (verify_only) {
44 guarantee(*pd_address_in_code() == x, "instructions must match");
45 } else {
46 *pd_address_in_code() = x;
47 }
48 } else if (which == Assembler::narrow_oop_operand) {
49 address disp = Assembler::locate_operand(addr(), which);
50 // both compressed oops and compressed classes look the same
51 if (Universe::heap()->is_in_reserved((oop)x)) {
52 if (verify_only) {
53 guarantee(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match");
54 } else {
55 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
56 }
57 } else {
58 if (verify_only) {
59 guarantee(*(uint32_t*) disp == Klass::encode_klass((Klass*)x), "instructions must match");
60 } else {
61 *(int32_t*) disp = Klass::encode_klass((Klass*)x);
62 }
63 }
64 } else {
65 // Note: Use runtime_call_type relocations for call32_operand.
66 address ip = addr();
67 address disp = Assembler::locate_operand(ip, which);
68 address next_ip = Assembler::locate_next_instruction(ip);
69 if (verify_only) {
70 guarantee(*(int32_t*) disp == (x - next_ip), "instructions must match");
71 } else {
72 *(int32_t*) disp = x - next_ip;
73 }
74 }
75 #else
76 if (verify_only) {
77 guarantee(*pd_address_in_code() == (x + o), "instructions must match");
78 } else {
79 *pd_address_in_code() = x + o;
80 }
81 #endif // AMD64
82 }
83
84
85 address Relocation::pd_call_destination(address orig_addr) {
86 intptr_t adj = 0;
87 if (orig_addr != NULL) {
88 // We just moved this call instruction from orig_addr to addr().
89 // This means its target will appear to have grown by addr() - orig_addr.
90 adj = -( addr() - orig_addr );
91 }
92 NativeInstruction* ni = nativeInstruction_at(addr());
93 if (ni->is_call()) {
94 return nativeCall_at(addr())->destination() + adj;
95 } else if (ni->is_jump()) {
96 return nativeJump_at(addr())->jump_destination() + adj;
97 } else if (ni->is_cond_jump()) {
98 return nativeGeneralJump_at(addr())->jump_destination() + adj;
99 } else if (ni->is_mov_literal64()) {
100 return (address) ((NativeMovConstReg*)ni)->data();
101 } else {
102 ShouldNotReachHere();
103 return NULL;
104 }
105 }
106
107
108 void Relocation::pd_set_call_destination(address x) {
109 NativeInstruction* ni = nativeInstruction_at(addr());
110 if (ni->is_call()) {
111 nativeCall_at(addr())->set_destination(x);
112 } else if (ni->is_jump()) {
113 NativeJump* nj = nativeJump_at(addr());
114
115 // Unresolved jumps are recognized by a destination of -1
116 // However 64bit can't actually produce such an address
117 // and encodes a jump to self but jump_destination will
118 // return a -1 as the signal. We must not relocate this
119 // jmp or the ic code will not see it as unresolved.
120
121 if (nj->jump_destination() == (address) -1) {
122 x = addr(); // jump to self
123 }
124 nj->set_jump_destination(x);
125 } else if (ni->is_cond_jump()) {
126 // %%%% kludge this, for now, until we get a jump_destination method
127 address old_dest = nativeGeneralJump_at(addr())->jump_destination();
128 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
129 *(jint*)disp += (x - old_dest);
130 } else if (ni->is_mov_literal64()) {
131 ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
132 } else {
133 ShouldNotReachHere();
134 }
135 }
136
137
138 address* Relocation::pd_address_in_code() {
139 // All embedded Intel addresses are stored in 32-bit words.
140 // Since the addr points at the start of the instruction,
141 // we must parse the instruction a bit to find the embedded word.
142 assert(is_data(), "must be a DataRelocation");
143 typedef Assembler::WhichOperand WhichOperand;
144 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
145 #ifdef AMD64
146 assert(which == Assembler::disp32_operand ||
147 which == Assembler::call32_operand ||
148 which == Assembler::imm_operand, "format unpacks ok");
149 // The "address" in the code is a displacement can't return it as
150 // and address* since it is really a jint*
151 guarantee(which == Assembler::imm_operand, "must be immediate operand");
152 #else
153 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok");
154 #endif // AMD64
155 return (address*) Assembler::locate_operand(addr(), which);
156 }
157
158
159 address Relocation::pd_get_address_from_code() {
160 #ifdef AMD64
161 // All embedded Intel addresses are stored in 32-bit words.
162 // Since the addr points at the start of the instruction,
163 // we must parse the instruction a bit to find the embedded word.
164 assert(is_data(), "must be a DataRelocation");
165 typedef Assembler::WhichOperand WhichOperand;
166 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
167 assert(which == Assembler::disp32_operand ||
168 which == Assembler::call32_operand ||
169 which == Assembler::imm_operand, "format unpacks ok");
170 if (which != Assembler::imm_operand) {
171 address ip = addr();
172 address disp = Assembler::locate_operand(ip, which);
173 address next_ip = Assembler::locate_next_instruction(ip);
174 address a = next_ip + *(int32_t*) disp;
175 return a;
176 }
177 #endif // AMD64
178 return *pd_address_in_code();
179 }
180
181 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
182 #ifdef _LP64
183 typedef Assembler::WhichOperand WhichOperand;
184 WhichOperand which = (WhichOperand) format();
185 #if !INCLUDE_JVMCI
186 assert((which == Assembler::disp32_operand) == !Assembler::is_polling_page_far(), "format not set correctly");
187 #endif
188 if (which == Assembler::disp32_operand) {
189 address orig_addr = old_addr_for(addr(), src, dest);
190 NativeInstruction* oni = nativeInstruction_at(orig_addr);
191 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
192 // This poll_addr is incorrect by the size of the instruction it is irrelevant
193 intptr_t poll_addr = (intptr_t)oni + *orig_disp;
194 NativeInstruction* ni = nativeInstruction_at(addr());
195 intptr_t new_disp = poll_addr - (intptr_t) ni;
196
197 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
198 * disp = (int32_t)new_disp;
199 }
200 #endif // _LP64
201 }
202
203 void metadata_Relocation::pd_fix_value(address x) {
204 }