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1 /*
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2 * Copyright 1998-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_relocInfo_x86.cpp.incl"
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27
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28
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29 void Relocation::pd_set_data_value(address x, intptr_t o) {
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30 #ifdef AMD64
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31 x += o;
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32 typedef Assembler::WhichOperand WhichOperand;
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33 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64, call32
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34 assert(which == Assembler::disp32_operand ||
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35 which == Assembler::imm64_operand, "format unpacks ok");
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36 if (which == Assembler::imm64_operand) {
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37 *pd_address_in_code() = x;
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38 } else {
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39 // Note: Use runtime_call_type relocations for call32_operand.
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40 address ip = addr();
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41 address disp = Assembler::locate_operand(ip, which);
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42 address next_ip = Assembler::locate_next_instruction(ip);
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43 *(int32_t*) disp = x - next_ip;
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44 }
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45 #else
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46 *pd_address_in_code() = x + o;
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47 #endif // AMD64
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48 }
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49
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50
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51 address Relocation::pd_call_destination(address orig_addr) {
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52 intptr_t adj = 0;
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53 if (orig_addr != NULL) {
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54 // We just moved this call instruction from orig_addr to addr().
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55 // This means its target will appear to have grown by addr() - orig_addr.
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56 adj = -( addr() - orig_addr );
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57 }
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58 NativeInstruction* ni = nativeInstruction_at(addr());
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59 if (ni->is_call()) {
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60 return nativeCall_at(addr())->destination() + adj;
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61 } else if (ni->is_jump()) {
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62 return nativeJump_at(addr())->jump_destination() + adj;
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63 } else if (ni->is_cond_jump()) {
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64 return nativeGeneralJump_at(addr())->jump_destination() + adj;
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65 } else if (ni->is_mov_literal64()) {
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66 return (address) ((NativeMovConstReg*)ni)->data();
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67 } else {
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68 ShouldNotReachHere();
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69 return NULL;
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70 }
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71 }
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72
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73
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74 void Relocation::pd_set_call_destination(address x) {
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75 NativeInstruction* ni = nativeInstruction_at(addr());
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76 if (ni->is_call()) {
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77 nativeCall_at(addr())->set_destination(x);
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78 } else if (ni->is_jump()) {
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79 NativeJump* nj = nativeJump_at(addr());
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80 #ifdef AMD64
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81 if (nj->jump_destination() == (address) -1) {
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82 x = (address) -1; // retain jump to self
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83 }
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84 #endif // AMD64
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85 nj->set_jump_destination(x);
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86 } else if (ni->is_cond_jump()) {
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87 // %%%% kludge this, for now, until we get a jump_destination method
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88 address old_dest = nativeGeneralJump_at(addr())->jump_destination();
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89 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand);
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90 *(jint*)disp += (x - old_dest);
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91 } else if (ni->is_mov_literal64()) {
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92 ((NativeMovConstReg*)ni)->set_data((intptr_t)x);
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93 } else {
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94 ShouldNotReachHere();
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95 }
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96 }
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97
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98
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99 address* Relocation::pd_address_in_code() {
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100 // All embedded Intel addresses are stored in 32-bit words.
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101 // Since the addr points at the start of the instruction,
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102 // we must parse the instruction a bit to find the embedded word.
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103 assert(is_data(), "must be a DataRelocation");
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104 typedef Assembler::WhichOperand WhichOperand;
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105 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
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106 #ifdef AMD64
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107 assert(which == Assembler::disp32_operand ||
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108 which == Assembler::call32_operand ||
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109 which == Assembler::imm64_operand, "format unpacks ok");
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110 if (which != Assembler::imm64_operand) {
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111 // The "address" in the code is a displacement can't return it as
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112 // and address* since it is really a jint*
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113 ShouldNotReachHere();
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114 return NULL;
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115 }
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116 #else
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117 assert(which == Assembler::disp32_operand || which == Assembler::imm32_operand, "format unpacks ok");
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118 #endif // AMD64
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119 return (address*) Assembler::locate_operand(addr(), which);
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120 }
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121
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122
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123 address Relocation::pd_get_address_from_code() {
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124 #ifdef AMD64
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125 // All embedded Intel addresses are stored in 32-bit words.
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126 // Since the addr points at the start of the instruction,
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127 // we must parse the instruction a bit to find the embedded word.
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128 assert(is_data(), "must be a DataRelocation");
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129 typedef Assembler::WhichOperand WhichOperand;
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130 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm64/imm32
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131 assert(which == Assembler::disp32_operand ||
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132 which == Assembler::call32_operand ||
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133 which == Assembler::imm64_operand, "format unpacks ok");
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134 if (which != Assembler::imm64_operand) {
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135 address ip = addr();
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136 address disp = Assembler::locate_operand(ip, which);
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137 address next_ip = Assembler::locate_next_instruction(ip);
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138 address a = next_ip + *(int32_t*) disp;
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139 return a;
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140 }
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141 #endif // AMD64
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142 return *pd_address_in_code();
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143 }
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144
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145 int Relocation::pd_breakpoint_size() {
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146 // minimum breakpoint size, in short words
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147 return NativeIllegalInstruction::instruction_size / sizeof(short);
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148 }
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149
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150 void Relocation::pd_swap_in_breakpoint(address x, short* instrs, int instrlen) {
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151 Untested("pd_swap_in_breakpoint");
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152 if (instrs != NULL) {
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153 assert(instrlen * sizeof(short) == NativeIllegalInstruction::instruction_size, "enough instrlen in reloc. data");
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154 for (int i = 0; i < instrlen; i++) {
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155 instrs[i] = ((short*)x)[i];
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156 }
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157 }
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158 NativeIllegalInstruction::insert(x);
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159 }
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160
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161
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162 void Relocation::pd_swap_out_breakpoint(address x, short* instrs, int instrlen) {
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163 Untested("pd_swap_out_breakpoint");
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164 assert(NativeIllegalInstruction::instruction_size == sizeof(short), "right address unit for update");
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165 NativeInstruction* ni = nativeInstruction_at(x);
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166 *(short*)ni->addr_at(0) = instrs[0];
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167 }
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