1 /*
2 * Copyright (c) 1998, 2010, 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/assembler.inline.hpp"
27 #include "assembler_x86.inline.hpp"
28 #include "code/relocInfo.hpp"
29 #include "nativeInst_x86.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) {
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 *pd_address_in_code() = x;
44 } else if (which == Assembler::narrow_oop_operand) {
45 address disp = Assembler::locate_operand(addr(), which);
46 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
47 } else {
48 // Note: Use runtime_call_type relocations for call32_operand.
49 address ip = addr();
50 address disp = Assembler::locate_operand(ip, which);
51 address next_ip = Assembler::locate_next_instruction(ip);
52 *(int32_t*) disp = x - next_ip;
53 }
54 #else
55 *pd_address_in_code() = x + o;
56 #endif // AMD64
57 }
58
59
60 address Relocation::pd_call_destination(address orig_addr) {
61 intptr_t adj = 0;
62 if (orig_addr != NULL) {
63 // We just moved this call instruction from orig_addr to addr().
64 // This means its target will appear to have grown by addr() - orig_addr.
65 adj = -( addr() - orig_addr );
66 }
67 NativeInstruction* ni = nativeInstruction_at(addr());
68 if (ni->is_call()) {
69 return nativeCall_at(addr())->destination() + adj;
70 } else if (ni->is_jump()) {
71 return nativeJump_at(addr())->jump_destination() + adj;
72 } else if (ni->is_cond_jump()) {
73 return nativeGeneralJump_at(addr())->jump_destination() + adj;
74 } else if (ni->is_mov_literal64()) {
75 return (address) ((NativeMovConstReg*)ni)->data();
76 } else {
77 ShouldNotReachHere();
78 return NULL;
79 }
80 }
81
82
83 void Relocation::pd_set_call_destination(address x) {
84 NativeInstruction* ni = nativeInstruction_at(addr());
85 if (ni->is_call()) {
86 nativeCall_at(addr())->set_destination(x);
87 } else if (ni->is_jump()) {
88 NativeJump* nj = nativeJump_at(addr());
89
90 // Unresolved jumps are recognized by a destination of -1
91 // However 64bit can't actually produce such an address
92 // and encodes a jump to self but jump_destination will
93 // return a -1 as the signal. We must not relocate this
94 // jmp or the ic code will not see it as unresolved.
95
96 if (nj->jump_destination() == (address) -1) {
97 x = addr(); // jump to self
98 }
99 nj->set_jump_destination(x);
100 } else if (ni->is_cond_jump()) {
101 // %%%% kludge this, for now, until we get a jump_destination method
102 address old_dest = nativeGeneralJump_at(addr())->jump_destination();
103 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
104 *(jint*)disp += (x - old_dest);
105 } else if (ni->is_mov_literal64()) {
106 ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
107 } else {
108 ShouldNotReachHere();
109 }
110 }
111
112
113 address* Relocation::pd_address_in_code() {
114 // All embedded Intel addresses are stored in 32-bit words.
115 // Since the addr points at the start of the instruction,
116 // we must parse the instruction a bit to find the embedded word.
117 assert(is_data(), "must be a DataRelocation");
118 typedef Assembler::WhichOperand WhichOperand;
119 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32
120 #ifdef AMD64
121 assert(which == Assembler::disp32_operand ||
122 which == Assembler::call32_operand ||
123 which == Assembler::imm_operand, "format unpacks ok");
124 if (which != Assembler::imm_operand) {
125 // The "address" in the code is a displacement can't return it as
126 // and address* since it is really a jint*
127 ShouldNotReachHere();
128 return NULL;
129 }
130 #else
131 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok");
132 #endif // AMD64
133 return (address*) Assembler::locate_operand(addr(), which);
134 }
135
136
137 address Relocation::pd_get_address_from_code() {
138 #ifdef AMD64
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 assert(which == Assembler::disp32_operand ||
146 which == Assembler::call32_operand ||
147 which == Assembler::imm_operand, "format unpacks ok");
148 if (which != Assembler::imm_operand) {
149 address ip = addr();
150 address disp = Assembler::locate_operand(ip, which);
151 address next_ip = Assembler::locate_next_instruction(ip);
152 address a = next_ip + *(int32_t*) disp;
153 return a;
154 }
155 #endif // AMD64
156 return *pd_address_in_code();
157 }
158
159 int Relocation::pd_breakpoint_size() {
160 // minimum breakpoint size, in short words
161 return NativeIllegalInstruction::instruction_size / sizeof(short);
162 }
163
164 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
165 Untested("pd_swap_in_breakpoint");
166 if (instrs != NULL) {
167 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
168 for (int i = 0; i < instrlen; i++) {
169 instrs[i] = ((short*)x)[i];
170 }
171 }
172 NativeIllegalInstruction::insert(x);
173 }
174
175
176 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
177 Untested("pd_swap_out_breakpoint");
178 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
179 NativeInstruction* ni = nativeInstruction_at(x);
180 *(short*)ni->addr_at(0) = instrs[0];
181 }
182
183 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
184 #ifdef _LP64
185 typedef Assembler::WhichOperand WhichOperand;
186 WhichOperand which = (WhichOperand) format();
187 // This format is imm but it is really disp32
188 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
195 NativeInstruction* ni = nativeInstruction_at(addr());
196 intptr_t new_disp = poll_addr - (intptr_t) ni;
197
198 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
199 * disp = (int32_t)new_disp;
200
201 #endif // _LP64
202 }
203
204 void poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
205 #ifdef _LP64
206 typedef Assembler::WhichOperand WhichOperand;
207 WhichOperand which = (WhichOperand) format();
208 // This format is imm but it is really disp32
209 which = Assembler::disp32_operand;
210 address orig_addr = old_addr_for(addr(), src, dest);
211 NativeInstruction* oni = nativeInstruction_at(orig_addr);
212 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which);
213 // This poll_addr is incorrect by the size of the instruction it is irrelevant
214 intptr_t poll_addr = (intptr_t)oni + *orig_disp;
215
216 NativeInstruction* ni = nativeInstruction_at(addr());
217 intptr_t new_disp = poll_addr - (intptr_t) ni;
218
219 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which);
220 * disp = (int32_t)new_disp;
221 #endif // _LP64
222 }