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