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 orig_addr = nativeCall_at(inst_loc)->get_trampoline();
88 if (orig_addr == NULL) {
89 return (address) -1;
90 } else {
91 return ((NativeCallTrampolineStub*)orig_addr)->destination();
92 }
93 }
94 }
95
96 void Relocation::pd_set_call_destination(address x) {
97 address inst_loc = addr();
98
99 if (NativeFarCall::is_far_call_at(inst_loc)) {
100 NativeFarCall* call = nativeFarCall_at(inst_loc);
101 call->set_destination(x);
102 } else if (NativeJump::is_jump_at(inst_loc)) {
103 NativeJump* jump= nativeJump_at(inst_loc);
104 jump->set_jump_destination(x);
105 } else if (NativeConditionalFarBranch::is_conditional_far_branch_at(inst_loc)) {
106 NativeConditionalFarBranch* branch = NativeConditionalFarBranch_at(inst_loc);
107 branch->set_branch_destination(x);
108 } else {
109 NativeCall* call = nativeCall_at(inst_loc);
110 call->set_destination_mt_safe(x, false);
111 }
112 }
113
114 address* Relocation::pd_address_in_code() {
115 ShouldNotReachHere();
116 return 0;
117 }
118
119 address Relocation::pd_get_address_from_code() {
120 return (address)(nativeMovConstReg_at(addr())->data());
121 }
122
123 void poll_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) {
124 }
125
126 void metadata_Relocation::pd_fix_value(address x) {
127 }