1 /*
2 * Copyright 1998-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 # include "incls/_precompiled.incl"
26 # include "incls/_relocInfo_x86.cpp.incl"
27
28
29 void Relocation::pd_set_data_value(address x, intptr_t o) {
30 #ifdef AMD64
31 x += o;
32 typedef Assembler::WhichOperand WhichOperand;
33 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64, call32, narrow oop
34 assert(which == Assembler::disp32_operand ||
35 which == Assembler::narrow_oop_operand ||
36 which == Assembler::imm64_operand, "format unpacks ok");
37 if (which == Assembler::imm64_operand) {
38 *pd_address_in_code() = x;
39 } else if (which == Assembler::narrow_oop_operand) {
40 address disp = Assembler::locate_operand(addr(), which);
41 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x);
42 } else {
43 // Note: Use runtime_call_type relocations for call32_operand.
44 address ip = addr();
45 address disp = Assembler::locate_operand(ip, which);
46 address next_ip = Assembler::locate_next_instruction(ip);
47 *(int32_t*) disp = x - next_ip;
48 }
49 #else
50 *pd_address_in_code() = x + o;
51 #endif // AMD64
52 }
53
54
55 address Relocation::pd_call_destination(address orig_addr) {
56 intptr_t adj = 0;
57 if (orig_addr != NULL) {
58 // We just moved this call instruction from orig_addr to addr().
59 // This means its target will appear to have grown by addr() - orig_addr.
60 adj = -( addr() - orig_addr );
61 }
62 NativeInstruction* ni = nativeInstruction_at(addr());
63 if (ni->is_call()) {
64 return nativeCall_at(addr())->destination() + adj;
65 } else if (ni->is_jump()) {
66 return nativeJump_at(addr())->jump_destination() + adj;
67 } else if (ni->is_cond_jump()) {
68 return nativeGeneralJump_at(addr())->jump_destination() + adj;
69 } else if (ni->is_mov_literal64()) {
70 return (address) ((NativeMovConstReg*)ni)->data();
71 } else {
72 ShouldNotReachHere();
73 return NULL;
74 }
75 }
76
77
78 void Relocation::pd_set_call_destination(address x) {
79 NativeInstruction* ni = nativeInstruction_at(addr());
80 if (ni->is_call()) {
81 nativeCall_at(addr())->set_destination(x);
82 } else if (ni->is_jump()) {
83 NativeJump* nj = nativeJump_at(addr());
84 #ifdef AMD64
85 if (nj->jump_destination() == (address) -1) {
86 x = (address) -1; // retain jump to self
87 }
88 #endif // AMD64
89 nj->set_jump_destination(x);
90 } else if (ni->is_cond_jump()) {
91 // %%%% kludge this, for now, until we get a jump_destination method
92 address old_dest = nativeGeneralJump_at(addr())->jump_destination();
93 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
94 *(jint*)disp += (x - old_dest);
95 } else if (ni->is_mov_literal64()) {
96 ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
97 } else {
98 ShouldNotReachHere();
99 }
100 }
101
102
103 address* Relocation::pd_address_in_code() {
104 // All embedded Intel addresses are stored in 32-bit words.
105 // Since the addr points at the start of the instruction,
106 // we must parse the instruction a bit to find the embedded word.
107 assert(is_data(), "must be a DataRelocation");
108 typedef Assembler::WhichOperand WhichOperand;
109 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
110 #ifdef AMD64
111 assert(which == Assembler::disp32_operand ||
112 which == Assembler::call32_operand ||
113 which == Assembler::imm64_operand, "format unpacks ok");
114 if (which != Assembler::imm64_operand) {
115 // The "address" in the code is a displacement can't return it as
116 // and address* since it is really a jint*
117 ShouldNotReachHere();
118 return NULL;
119 }
120 #else
121 assert(which == Assembler::disp32_operand || which == Assembler::imm32_operand, "format unpacks ok");
122 #endif // AMD64
123 return (address*) Assembler::locate_operand(addr(), which);
124 }
125
126
127 address Relocation::pd_get_address_from_code() {
128 #ifdef AMD64
129 // All embedded Intel addresses are stored in 32-bit words.
130 // Since the addr points at the start of the instruction,
131 // we must parse the instruction a bit to find the embedded word.
132 assert(is_data(), "must be a DataRelocation");
133 typedef Assembler::WhichOperand WhichOperand;
134 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
135 assert(which == Assembler::disp32_operand ||
136 which == Assembler::call32_operand ||
137 which == Assembler::imm64_operand, "format unpacks ok");
138 if (which != Assembler::imm64_operand) {
139 address ip = addr();
140 address disp = Assembler::locate_operand(ip, which);
141 address next_ip = Assembler::locate_next_instruction(ip);
142 address a = next_ip + *(int32_t*) disp;
143 return a;
144 }
145 #endif // AMD64
146 return *pd_address_in_code();
147 }
148
149 int Relocation::pd_breakpoint_size() {
150 // minimum breakpoint size, in short words
151 return NativeIllegalInstruction::instruction_size / sizeof(short);
152 }
153
154 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
155 Untested("pd_swap_in_breakpoint");
156 if (instrs != NULL) {
157 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
158 for (int i = 0; i < instrlen; i++) {
159 instrs[i] = ((short*)x)[i];
160 }
161 }
162 NativeIllegalInstruction::insert(x);
163 }
164
165
166 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
167 Untested("pd_swap_out_breakpoint");
168 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
169 NativeInstruction* ni = nativeInstruction_at(x);
170 *(short*)ni->addr_at(0) = instrs[0];
171 }