1 //===- AArch64CA53Erratum843419Stub.cpp -----------------------------------===//
2 //
3 // The MCLinker Project
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "AArch64CA53Erratum843419Stub.h"
11 #include "AArch64InsnHelpers.h"
12
13 #include "mcld/Fragment/FragmentRef.h"
14 #include "mcld/Fragment/Relocation.h"
15 #include "mcld/IRBuilder.h"
16 #include "mcld/LD/BranchIsland.h"
17 #include "mcld/LD/LDSection.h"
18 #include "mcld/LD/LDSymbol.h"
19 #include "mcld/LD/ResolveInfo.h"
20 #include "mcld/LD/SectionData.h"
21
22 #include <llvm/ADT/StringExtras.h>
23 #include <llvm/Support/ELF.h>
24
25 #include <cassert>
26
27 namespace mcld {
28
29 //===----------------------------------------------------------------------===//
30 // AArch64CA53Erratum843419Stub
31 //===----------------------------------------------------------------------===//
AArch64CA53Erratum843419Stub()32 AArch64CA53Erratum843419Stub::AArch64CA53Erratum843419Stub() {
33 }
34
35 /// for doClone
AArch64CA53Erratum843419Stub(const uint32_t * pData,size_t pSize,const char * pName,const_fixup_iterator pBegin,const_fixup_iterator pEnd)36 AArch64CA53Erratum843419Stub::AArch64CA53Erratum843419Stub(
37 const uint32_t* pData,
38 size_t pSize,
39 const char* pName,
40 const_fixup_iterator pBegin,
41 const_fixup_iterator pEnd)
42 : AArch64CA53ErratumStub(pData, pSize, pName, pBegin, pEnd) {
43 }
44
~AArch64CA53Erratum843419Stub()45 AArch64CA53Erratum843419Stub::~AArch64CA53Erratum843419Stub() {
46 }
47
isErratum843419Sequence(unsigned insn1,unsigned insn2,unsigned insn3)48 bool AArch64CA53Erratum843419Stub::isErratum843419Sequence(unsigned insn1,
49 unsigned insn2,
50 unsigned insn3) {
51 unsigned rt;
52 unsigned rt2;
53 bool is_pair;
54 bool is_load;
55 return AArch64InsnHelpers::isMemOp(insn2, rt, rt2, is_pair, is_load) &&
56 (!is_pair || (is_pair && !is_load)) &&
57 AArch64InsnHelpers::isLDSTUIMM(insn3) &&
58 (AArch64InsnHelpers::getRn(insn3) == AArch64InsnHelpers::getRd(insn1));
59 }
60
isMyDuty(const FragmentRef & pFragRef) const61 bool AArch64CA53Erratum843419Stub::isMyDuty(const FragmentRef& pFragRef) const {
62 if ((pFragRef.offset() + AArch64InsnHelpers::InsnSize * 3) >
63 pFragRef.frag()->size()) {
64 return false;
65 }
66
67 // The first instruction must be ending at 0xFF8 or 0xFFC.
68 const uint64_t vma = pFragRef.frag()->getParent()->getSection().addr() +
69 pFragRef.getOutputOffset();
70 const unsigned page_offset = (vma & 0xFFF);
71 if ((page_offset != 0xFF8) && (page_offset != 0xFFC)) {
72 return false;
73 }
74
75 ErratumSequence code;
76 pFragRef.memcpy(&code, AArch64InsnHelpers::InsnSize * 3, 0);
77
78 if (isErratum843419Sequence(code.insns[0], code.insns[1], code.insns[2])) {
79 return true;
80 }
81
82 return false;
83 }
84
doClone()85 Stub* AArch64CA53Erratum843419Stub::doClone() {
86 return new AArch64CA53Erratum843419Stub(getData(),
87 size(),
88 "erratum_843419_veneer",
89 fixup_begin(),
90 fixup_end());
91 }
92
93 } // namespace mcld
94