1 /* 2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2012, 2015 SAP AG. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 #include "precompiled.hpp" 27 #include "asm/assembler.inline.hpp" 28 #include "code/relocInfo.hpp" 29 #include "nativeInst_ppc.hpp" 30 #include "oops/klass.inline.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/safepoint.hpp" 33 34 void Relocation::pd_set_data_value(address x, intptr_t o, bool verify_only) { 35 // The following comment is from the declaration of DataRelocation: 36 // 37 // "The "o" (displacement) argument is relevant only to split relocations 38 // on RISC machines. In some CPUs (SPARC), the set-hi and set-lo ins'ns 39 // can encode more than 32 bits between them. This allows compilers to 40 // share set-hi instructions between addresses that differ by a small 41 // offset (e.g., different static variables in the same class). 42 // On such machines, the "x" argument to set_value on all set-lo 43 // instructions must be the same as the "x" argument for the 44 // corresponding set-hi instructions. The "o" arguments for the 45 // set-hi instructions are ignored, and must not affect the high-half 46 // immediate constant. The "o" arguments for the set-lo instructions are 47 // added into the low-half immediate constant, and must not overflow it." 48 // 49 // Currently we don't support splitting of relocations, so o must be 50 // zero: 51 assert(o == 0, "tried to split relocations"); 52 53 if (!verify_only) { 54 if (format() != 1) { 55 nativeMovConstReg_at(addr())->set_data_plain(((intptr_t)x), code()); 56 } else { 57 assert(type() == relocInfo::oop_type || type() == relocInfo::metadata_type, 58 "how to encode else?"); 59 narrowOop no = (type() == relocInfo::oop_type) ? 60 oopDesc::encode_heap_oop((oop)x) : Klass::encode_klass((Klass*)x); 61 nativeMovConstReg_at(addr())->set_narrow_oop(no, code()); 62 } 63 } else { 64 guarantee((address) (nativeMovConstReg_at(addr())->data()) == x, "data must match"); 65 } 66 } 67 68 address Relocation::pd_call_destination(address orig_addr) { 69 intptr_t adj = 0; 70 address inst_loc = addr(); 71 72 if (orig_addr != NULL) { 73 // We just moved this call instruction from orig_addr to addr(). 74 // This means its target will appear to have grown by addr() - orig_addr. 75 adj = -(inst_loc - orig_addr); 76 } 77 if (NativeFarCall::is_far_call_at(inst_loc)) { 78 NativeFarCall* call = nativeFarCall_at(inst_loc); 79 return call->destination() + (intptr_t)(call->is_pcrelative() ? adj : 0); 80 } else if (NativeJump::is_jump_at(inst_loc)) { 81 NativeJump* jump = nativeJump_at(inst_loc); 82 return jump->jump_destination() + (intptr_t)(jump->is_pcrelative() ? adj : 0); 83 } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) { 84 NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc); 85 return branch->branch_destination(); 86 } else { 87 // There are two instructions at the beginning of a stub, therefore we 88 // load at orig_addr + 8. 89 orig_addr = nativeCall_at(inst_loc)->get_trampoline(); 90 if (orig_addr == NULL) { 91 return (address) -1; 92 } else { 93 return (address) nativeMovConstReg_at(orig_addr + 8)->data(); 94 } 95 } 96 } 97 98 void Relocation::pd_set_call_destination(address x) { 99 address inst_loc = addr(); 100 101 if (NativeFarCall::is_far_call_at(inst_loc)) { 102 NativeFarCall* call = nativeFarCall_at(inst_loc); 103 call->set_destination(x); 104 } else if (NativeJump::is_jump_at(inst_loc)) { 105 NativeJump* jump= nativeJump_at(inst_loc); 106 jump->set_jump_destination(x); 107 } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) { 108 NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc); 109 branch->set_branch_destination(x); 110 } else { 111 NativeCall* call = nativeCall_at(inst_loc); 112 call->set_destination_mt_safe(x, false); 113 } 114 } 115 116 address* Relocation::pd_address_in_code() { 117 ShouldNotReachHere(); 118 return 0; 119 } 120 121 address Relocation::pd_get_address_from_code() { 122 return (address)(nativeMovConstReg_at(addr())->data()); 123 } 124 125 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 126 } 127 128 void metadata_Relocation::pd_fix_value(address x) { 129 }