1 /* 2 * Copyright (c) 2008, 2018, 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/assembler.inline.hpp" 27 #include "assembler_arm.inline.hpp" 28 #include "code/relocInfo.hpp" 29 #include "nativeInst_arm.hpp" 30 #include "oops/compressedOops.inline.hpp" 31 #include "oops/oop.hpp" 32 #include "runtime/orderAccess.hpp" 33 #include "runtime/safepoint.hpp" 34 35 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) { 36 37 NativeMovConstReg* ni = nativeMovConstReg_at(addr()); 38 if (verify_only) { 39 guarantee(ni->data() == (intptr_t)(x + o), "instructions must match"); 40 } else { 41 ni->set_data((intptr_t)(x + o)); 42 } 43 } 44 45 address Relocation::pd_call_destination(address orig_addr) { 46 address pc = addr(); 47 48 int adj = 0; 49 if (orig_addr != NULL) { 50 // We just moved this call instruction from orig_addr to addr(). 51 // This means that, when relative, its target will appear to have grown by addr() - orig_addr. 52 adj = orig_addr - pc; 53 } 54 55 RawNativeInstruction* ni = rawNativeInstruction_at(pc); 56 57 if (ni->is_add_lr()) { 58 // Skip the optional 'add LR, PC, #offset' 59 // (Allowing the jump support code to handle fat_call) 60 pc = ni->next_raw_instruction_address(); 61 ni = nativeInstruction_at(pc); 62 } 63 64 if (ni->is_bl()) { 65 // Fat_call are handled by is_jump for the new 'ni', 66 // requiring only to support is_bl. 67 return rawNativeCall_at(pc)->destination(adj); 68 } 69 70 if (ni->is_jump()) { 71 return rawNativeJump_at(pc)->jump_destination(adj); 72 } 73 ShouldNotReachHere(); 74 return NULL; 75 } 76 77 void Relocation::pd_set_call_destination(address x) { 78 address pc = addr(); 79 NativeInstruction* ni = nativeInstruction_at(pc); 80 81 if (ni->is_add_lr()) { 82 // Skip the optional 'add LR, PC, #offset' 83 // (Allowing the jump support code to handle fat_call) 84 pc = ni->next_raw_instruction_address(); 85 ni = nativeInstruction_at(pc); 86 } 87 88 if (ni->is_bl()) { 89 // Fat_call are handled by is_jump for the new 'ni', 90 // requiring only to support is_bl. 91 rawNativeCall_at(pc)->set_destination(x); 92 return; 93 } 94 95 if (ni->is_jump()) { // raw jump 96 rawNativeJump_at(pc)->set_jump_destination(x); 97 return; 98 } 99 ShouldNotReachHere(); 100 } 101 102 103 address* Relocation::pd_address_in_code() { 104 return (address*)addr(); 105 } 106 107 address Relocation::pd_get_address_from_code() { 108 return *pd_address_in_code(); 109 } 110 111 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 112 } 113 114 void metadata_Relocation::pd_fix_value(address x) { 115 assert(! addr_in_const(), "Do not use"); 116 if (!VM_Version::supports_movw()) { 117 set_value(x); 118 #ifdef ASSERT 119 } else { 120 // the movw/movt data should be correct 121 NativeMovConstReg* ni = nativeMovConstReg_at(addr()); 122 assert(ni->is_movw(), "not a movw"); 123 // The following assert should be correct but the shared code 124 // currently 'fixes' the metadata instructions before the 125 // metadata_table is copied in the new method (see 126 // JDK-8042845). This means that 'x' (which comes from the table) 127 // does not match the value inlined in the code (which is 128 // correct). Failure can be temporarily ignored since the code is 129 // correct and the table is copied shortly afterward. 130 // 131 // assert(ni->data() == (int)x, "metadata relocation mismatch"); 132 #endif 133 } 134 }