1 /* 2 * Copyright (c) 2008, 2016, 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/oop.inline.hpp" 31 #include "runtime/safepoint.hpp" 32 33 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) { 34 35 NativeMovConstReg* ni = nativeMovConstReg_at(addr()); 36 #if defined(AARCH64) && defined(COMPILER2) 37 if (ni->is_movz()) { 38 assert(type() == relocInfo::oop_type, "!"); 39 if (verify_only) { 40 uintptr_t d = ni->data(); 41 guarantee((d >> 32) == 0, "not narrow oop"); 42 narrowOop no = d; 43 oop o = oopDesc::decode_heap_oop(no); 44 guarantee(cast_from_oop<intptr_t>(o) == (intptr_t)x, "instructions must match"); 45 } else { 46 ni->set_data((intptr_t)x); 47 } 48 return; 49 } 50 #endif 51 if (verify_only) { 52 guarantee(ni->data() == (intptr_t)(x + o), "instructions must match"); 53 } else { 54 ni->set_data((intptr_t)(x + o)); 55 } 56 } 57 58 address Relocation::pd_call_destination(address orig_addr) { 59 address pc = addr(); 60 61 int adj = 0; 62 if (orig_addr != NULL) { 63 // We just moved this call instruction from orig_addr to addr(). 64 // This means that, when relative, its target will appear to have grown by addr() - orig_addr. 65 adj = orig_addr - pc; 66 } 67 68 RawNativeInstruction* ni = rawNativeInstruction_at(pc); 69 70 #if (!defined(AARCH64)) 71 if (NOT_AARCH64(ni->is_add_lr()) AARCH64_ONLY(ni->is_adr_aligned_lr())) { 72 // On arm32, skip the optional 'add LR, PC, #offset' 73 // (Allowing the jump support code to handle fat_call) 74 pc = ni->next_raw_instruction_address(); 75 ni = nativeInstruction_at(pc); 76 } 77 #endif 78 79 if (AARCH64_ONLY(ni->is_call()) NOT_AARCH64(ni->is_bl())) { 80 // For arm32, fat_call are handled by is_jump for the new 'ni', 81 // requiring only to support is_bl. 82 // 83 // For AARCH64, skipping a leading adr is not sufficient 84 // to reduce calls to a simple bl. 85 return rawNativeCall_at(pc)->destination(adj); 86 } 87 88 if (ni->is_jump()) { 89 return rawNativeJump_at(pc)->jump_destination(adj); 90 } 91 ShouldNotReachHere(); 92 return NULL; 93 } 94 95 void Relocation::pd_set_call_destination(address x) { 96 address pc = addr(); 97 NativeInstruction* ni = nativeInstruction_at(pc); 98 99 #if (!defined(AARCH64)) 100 if (NOT_AARCH64(ni->is_add_lr()) AARCH64_ONLY(ni->is_adr_aligned_lr())) { 101 // On arm32, skip the optional 'add LR, PC, #offset' 102 // (Allowing the jump support code to handle fat_call) 103 pc = ni->next_raw_instruction_address(); 104 ni = nativeInstruction_at(pc); 105 } 106 #endif 107 108 if (AARCH64_ONLY(ni->is_call()) NOT_AARCH64(ni->is_bl())) { 109 // For arm32, fat_call are handled by is_jump for the new 'ni', 110 // requiring only to support is_bl. 111 // 112 // For AARCH64, skipping a leading adr is not sufficient 113 // to reduce calls to a simple bl. 114 rawNativeCall_at(pc)->set_destination(x); 115 return; 116 } 117 118 if (ni->is_jump()) { // raw jump 119 rawNativeJump_at(pc)->set_jump_destination(x); 120 return; 121 } 122 ShouldNotReachHere(); 123 } 124 125 126 address* Relocation::pd_address_in_code() { 127 return (address*)addr(); 128 } 129 130 address Relocation::pd_get_address_from_code() { 131 return *pd_address_in_code(); 132 } 133 134 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 135 } 136 137 void metadata_Relocation::pd_fix_value(address x) { 138 assert(! addr_in_const(), "Do not use"); 139 #ifdef AARCH64 140 #ifdef COMPILER2 141 NativeMovConstReg* ni = nativeMovConstReg_at(addr()); 142 if (ni->is_movz()) { 143 return; 144 } 145 #endif 146 set_value(x); 147 #else 148 if (!VM_Version::supports_movw()) { 149 set_value(x); 150 #ifdef ASSERT 151 } else { 152 // the movw/movt data should be correct 153 NativeMovConstReg* ni = nativeMovConstReg_at(addr()); 154 assert(ni->is_movw(), "not a movw"); 155 // The following assert should be correct but the shared code 156 // currently 'fixes' the metadata instructions before the 157 // metadata_table is copied in the new method (see 158 // JDK-8042845). This means that 'x' (which comes from the table) 159 // does not match the value inlined in the code (which is 160 // correct). Failure can be temporarily ignored since the code is 161 // correct and the table is copied shortly afterward. 162 // 163 // assert(ni->data() == (int)x, "metadata relocation mismatch"); 164 #endif 165 } 166 #endif // !AARCH64 167 }