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 assert(*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 assert(*(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 assert(*(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 assert(*(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 assert(*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 if (!Assembler::is_polling_page_far()) { 184 typedef Assembler::WhichOperand WhichOperand; 185 WhichOperand which = (WhichOperand) format(); 186 // This format is imm but it is really disp32 187 which = Assembler::disp32_operand; 188 address orig_addr = old_addr_for(addr(), src, dest); 189 NativeInstruction* oni = nativeInstruction_at(orig_addr); 190 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); 191 // This poll_addr is incorrect by the size of the instruction it is irrelevant 192 intptr_t poll_addr = (intptr_t)oni + *orig_disp; 193 194 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 poll_return_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 204 #ifdef _LP64 205 if (!Assembler::is_polling_page_far()) { 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 } 222 #endif // _LP64 223 } 224 225 void metadata_Relocation::pd_fix_value(address x) { 226 }