[Mips] Create special PLT entry in case of MIPS R6 ABI
llvm-svn: 232806
This commit is contained in:
Simon Atanasyan
parent
98236e0510
commit
12e9f8cd11
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@ -78,6 +78,14 @@ static const uint8_t micromipsPltAtomContent[] = {
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0x02, 0x0f // move $24, $2
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};
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// R6 PLT entry
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static const uint8_t mipsR6PltAAtomContent[] = {
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0x00, 0x00, 0x0f, 0x3c, // lui $15, %hi(.got.plt entry)
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0x00, 0x00, 0xf9, 0x8d, // l[wd] $25, %lo(.got.plt entry)($15)
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0x09, 0x00, 0x20, 0x03, // jr $25
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0x00, 0x00, 0xf8, 0x25 // addiu $24, $15, %lo(.got.plt entry)
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};
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// LA25 stub entry
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static const uint8_t mipsLA25AtomContent[] = {
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0x00, 0x00, 0x19, 0x3c, // lui $25, %hi(func)
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@ -214,6 +222,15 @@ public:
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}
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};
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class PLTR6Atom : public PLTAAtom {
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public:
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PLTR6Atom(const GOTPLTAtom *got, const File &f) : PLTAAtom(got, f) {}
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ArrayRef<uint8_t> rawContent() const override {
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return llvm::makeArrayRef(mipsR6PltAAtomContent);
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}
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};
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class PLTMicroAtom : public PLTAtom {
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public:
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PLTMicroAtom(const GOTPLTAtom *got, const File &f) : PLTAtom(f, ".plt") {
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@ -388,6 +405,8 @@ private:
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bool mightBeDynamic(const MipsELFDefinedAtom<ELFT> &atom,
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Reference::KindValue refKind) const;
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bool hasPLTEntry(const Atom *atom) const;
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bool isR6Target() const;
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};
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template <typename ELFT>
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@ -638,6 +657,16 @@ bool RelocationPass<ELFT>::hasPLTEntry(const Atom *atom) const {
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return _pltRegMap.count(atom) || _pltMicroMap.count(atom);
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}
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template <typename ELFT> bool RelocationPass<ELFT>::isR6Target() const {
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switch (_ctx.getMergedELFFlags() & EF_MIPS_ARCH) {
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case EF_MIPS_ARCH_32R6:
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case EF_MIPS_ARCH_64R6:
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return true;
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default:
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return false;
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}
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}
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template <typename ELFT>
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bool RelocationPass<ELFT>::requirePLTEntry(const Atom *a) const {
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if (!_hasStaticRelocations.count(a))
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@ -938,7 +967,9 @@ const PLTAtom *RelocationPass<ELFT>::getPLTRegEntry(const Atom *a) {
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if (plt != _pltRegMap.end())
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return plt->second;
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auto pa = new (_file._alloc) PLTAAtom(getGOTPLTEntry(a), _file);
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PLTAAtom *pa = isR6Target()
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? new (_file._alloc) PLTR6Atom(getGOTPLTEntry(a), _file)
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: new (_file._alloc) PLTAAtom(getGOTPLTEntry(a), _file);
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_pltRegMap[a] = pa;
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_pltRegVector.push_back(pa);
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@ -0,0 +1,109 @@
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# REQUIRES: mips
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# Check generation of PLT entries in case of R6 target ABI.
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# Build shared library
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# RUN: yaml2obj -format=elf -docnum 1 %s > %t-so.o
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# RUN: lld -flavor gnu -target mipsel -shared -o %t.so %t-so.o
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# Build executable
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# RUN: yaml2obj -format=elf -docnum 2 %s > %t-o.o
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# RUN: lld -flavor gnu -target mipsel -e T0 -o %t.exe %t-o.o %t.so
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# RUN: llvm-objdump -d %t.exe | FileCheck %s
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# CHECK: Disassembly of section .plt:
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# CHECK-NEXT: .plt:
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# CHECK-NEXT: 400160: 40 00 1c 3c lui $gp, 64
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# CHECK-NEXT: 400164: 00 20 99 8f lw $25, 8192($gp)
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# CHECK-NEXT: 400168: 00 20 9c 27 addiu $gp, $gp, 8192
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# CHECK-NEXT: 40016c: 23 c0 1c 03 subu $24, $24, $gp
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# CHECK-NEXT: 400170: 21 78 e0 03 move $15, $ra
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# CHECK-NEXT: 400174: 82 c0 18 00 srl $24, $24, 2
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# CHECK-NEXT: 400178: 09 f8 20 03 jalr $25
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# CHECK-NEXT: 40017c: fe ff 18 27 addiu $24, $24, -2
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# CHECK-NEXT: 400180: 40 00 0f 3c lui $15, 64
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# CHECK-NEXT: 400184: 08 20 f9 8d lw $25, 8200($15)
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# CHECK-NEXT: 400188: 09 00 20 03 jr $25
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# CHECK-NEXT: 40018c: 08 20 f8 25 addiu $24, $15, 8200
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# so.o
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---
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FileHeader:
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Class: ELFCLASS32
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_MIPS
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Flags: [EF_MIPS_PIC, EF_MIPS_CPIC, EF_MIPS_ABI_O32, EF_MIPS_ARCH_32R6]
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Size: 0x0C
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AddressAlign: 16
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Flags: [SHF_EXECINSTR, SHF_ALLOC]
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Symbols:
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Global:
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- Name: T1
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Section: .text
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Type: STT_FUNC
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Value: 0x0
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Size: 4
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# o.o
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---
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FileHeader:
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Class: ELFCLASS32
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_MIPS
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Flags: [EF_MIPS_CPIC, EF_MIPS_ABI_O32, EF_MIPS_ARCH_32R6]
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Content: "0000000C00000000"
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AddressAlign: 16
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Flags: [SHF_EXECINSTR, SHF_ALLOC]
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- Name: .data
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Type: SHT_PROGBITS
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Size: 0x08
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AddressAlign: 16
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Flags: [SHF_WRITE, SHF_ALLOC]
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- Name: .rel.text
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Type: SHT_REL
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Info: .text
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AddressAlign: 4
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Relocations:
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- Offset: 0x0
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Symbol: T1
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Type: R_MIPS_26
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- Name: .rel.data
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Type: SHT_REL
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Info: .data
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AddressAlign: 4
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Relocations:
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- Offset: 0x00
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Symbol: T1
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Type: R_MIPS_HI16
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- Offset: 0x00
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Symbol: T1
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Type: R_MIPS_LO16
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Symbols:
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Global:
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- Name: T0
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Section: .text
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Type: STT_FUNC
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Value: 0x0
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Size: 0x8
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- Name: D0
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Section: .data
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Type: STT_OBJECT
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Value: 0x0
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Size: 8
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- Name: T1
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...
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