1 /* 2 * Copyright (c) 1998, 2017, 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 #include "runtime/safepointMechanism.hpp" 33 34 35 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) { 36 #ifdef AMD64 37 x += o; 38 typedef Assembler::WhichOperand WhichOperand; 39 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm, call32, narrow oop 40 assert(which == Assembler::disp32_operand || 41 which == Assembler::narrow_oop_operand || 42 which == Assembler::imm_operand, "format unpacks ok"); 43 if (which == Assembler::imm_operand) { 44 if (verify_only) { 45 guarantee(*pd_address_in_code() == x, "instructions must match"); 46 } else { 47 *pd_address_in_code() = x; 48 } 49 } else if (which == Assembler::narrow_oop_operand) { 50 address disp = Assembler::locate_operand(addr(), which); 51 // both compressed oops and compressed classes look the same 52 if (Universe::heap()->is_in_reserved((oop)x)) { 53 if (verify_only) { 54 guarantee(*(uint32_t*) disp == oopDesc::encode_heap_oop((oop)x), "instructions must match"); 55 } else { 56 *(int32_t*) disp = oopDesc::encode_heap_oop((oop)x); 57 } 58 } else { 59 if (verify_only) { 60 guarantee(*(uint32_t*) disp == Klass::encode_klass((Klass*)x), "instructions must match"); 61 } else { 62 *(int32_t*) disp = Klass::encode_klass((Klass*)x); 63 } 64 } 65 } else { 66 // Note: Use runtime_call_type relocations for call32_operand. 67 address ip = addr(); 68 address disp = Assembler::locate_operand(ip, which); 69 address next_ip = Assembler::locate_next_instruction(ip); 70 if (verify_only) { 71 guarantee(*(int32_t*) disp == (x - next_ip), "instructions must match"); 72 } else { 73 *(int32_t*) disp = x - next_ip; 74 } 75 } 76 #else 77 if (verify_only) { 78 guarantee(*pd_address_in_code() == (x + o), "instructions must match"); 79 } else { 80 *pd_address_in_code() = x + o; 81 } 82 #endif // AMD64 83 } 84 85 86 address Relocation::pd_call_destination(address orig_addr) { 87 intptr_t adj = 0; 88 if (orig_addr != NULL) { 89 // We just moved this call instruction from orig_addr to addr(). 90 // This means its target will appear to have grown by addr() - orig_addr. 91 adj = -( addr() - orig_addr ); 92 } 93 NativeInstruction* ni = nativeInstruction_at(addr()); 94 if (ni->is_call()) { 95 return nativeCall_at(addr())->destination() + adj; 96 } else if (ni->is_jump()) { 97 return nativeJump_at(addr())->jump_destination() + adj; 98 } else if (ni->is_cond_jump()) { 99 return nativeGeneralJump_at(addr())->jump_destination() + adj; 100 } else if (ni->is_mov_literal64()) { 101 return (address) ((NativeMovConstReg*)ni)->data(); 102 } else { 103 ShouldNotReachHere(); 104 return NULL; 105 } 106 } 107 108 109 void Relocation::pd_set_call_destination(address x) { 110 NativeInstruction* ni = nativeInstruction_at(addr()); 111 if (ni->is_call()) { 112 nativeCall_at(addr())->set_destination(x); 113 } else if (ni->is_jump()) { 114 NativeJump* nj = nativeJump_at(addr()); 115 116 // Unresolved jumps are recognized by a destination of -1 117 // However 64bit can't actually produce such an address 118 // and encodes a jump to self but jump_destination will 119 // return a -1 as the signal. We must not relocate this 120 // jmp or the ic code will not see it as unresolved. 121 122 if (nj->jump_destination() == (address) -1) { 123 x = addr(); // jump to self 124 } 125 nj->set_jump_destination(x); 126 } else if (ni->is_cond_jump()) { 127 // %%%% kludge this, for now, until we get a jump_destination method 128 address old_dest = nativeGeneralJump_at(addr())->jump_destination(); 129 address disp = Assembler::locate_operand(addr(), Assembler::call32_operand); 130 *(jint*)disp += (x - old_dest); 131 } else if (ni->is_mov_literal64()) { 132 ((NativeMovConstReg*)ni)->set_data((intptr_t)x); 133 } else { 134 ShouldNotReachHere(); 135 } 136 } 137 138 139 address* Relocation::pd_address_in_code() { 140 // All embedded Intel addresses are stored in 32-bit words. 141 // Since the addr points at the start of the instruction, 142 // we must parse the instruction a bit to find the embedded word. 143 assert(is_data(), "must be a DataRelocation"); 144 typedef Assembler::WhichOperand WhichOperand; 145 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 146 #ifdef AMD64 147 assert(which == Assembler::disp32_operand || 148 which == Assembler::call32_operand || 149 which == Assembler::imm_operand, "format unpacks ok"); 150 // The "address" in the code is a displacement can't return it as 151 // and address* since it is really a jint* 152 guarantee(which == Assembler::imm_operand, "must be immediate operand"); 153 #else 154 assert(which == Assembler::disp32_operand || which == Assembler::imm_operand, "format unpacks ok"); 155 #endif // AMD64 156 return (address*) Assembler::locate_operand(addr(), which); 157 } 158 159 160 address Relocation::pd_get_address_from_code() { 161 #ifdef AMD64 162 // All embedded Intel addresses are stored in 32-bit words. 163 // Since the addr points at the start of the instruction, 164 // we must parse the instruction a bit to find the embedded word. 165 assert(is_data(), "must be a DataRelocation"); 166 typedef Assembler::WhichOperand WhichOperand; 167 WhichOperand which = (WhichOperand) format(); // that is, disp32 or imm/imm32 168 assert(which == Assembler::disp32_operand || 169 which == Assembler::call32_operand || 170 which == Assembler::imm_operand, "format unpacks ok"); 171 if (which != Assembler::imm_operand) { 172 address ip = addr(); 173 address disp = Assembler::locate_operand(ip, which); 174 address next_ip = Assembler::locate_next_instruction(ip); 175 address a = next_ip + *(int32_t*) disp; 176 return a; 177 } 178 #endif // AMD64 179 return *pd_address_in_code(); 180 } 181 182 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 183 #ifdef _LP64 184 typedef Assembler::WhichOperand WhichOperand; 185 WhichOperand which = (WhichOperand) format(); 186 #if !INCLUDE_JVMCI 187 if (SafepointMechanism::uses_global_page_poll()) { 188 assert((which == Assembler::disp32_operand) == !Assembler::is_polling_page_far(), "format not set correctly"); 189 } 190 #endif 191 if (which == Assembler::disp32_operand) { 192 assert(SafepointMechanism::uses_global_page_poll(), "should only have generated such a poll if global polling enabled"); 193 address orig_addr = old_addr_for(addr(), src, dest); 194 NativeInstruction* oni = nativeInstruction_at(orig_addr); 195 int32_t* orig_disp = (int32_t*) Assembler::locate_operand(orig_addr, which); 196 // This poll_addr is incorrect by the size of the instruction it is irrelevant 197 intptr_t poll_addr = (intptr_t)oni + *orig_disp; 198 NativeInstruction* ni = nativeInstruction_at(addr()); 199 intptr_t new_disp = poll_addr - (intptr_t) ni; 200 201 int32_t* disp = (int32_t*) Assembler::locate_operand(addr(), which); 202 * disp = (int32_t)new_disp; 203 } 204 #endif // _LP64 205 } 206 207 void metadata_Relocation::pd_fix_value(address x) { 208 }