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[llvm-mc] - Produce R_X86_64_PLT32 for "call/jmp foo". 

For instructions like call foo and jmp foo patch changes
relocation produced from R_X86_64_PC32 to R_X86_64_PLT32.
Relocation can be used as a marker for 32-bit PC-relative branches.
Linker will reduce PLT32 relocation to PC32 if function is defined locally.

Differential revision: https://reviews.llvm.org/D43383

llvm-svn: 325569
This commit is contained in:
George Rimar 2018-02-20 10:17:57 +00:00
parent 65d2d5bad4
commit da4f43a4b4
14 changed files with 60 additions and 21 deletions
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3
llvm/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
View File

@ -46,6 +46,7 @@ static unsigned getFixupKindLog2Size(unsigned Kind) {
case X86::reloc_signed_4byte:
case X86::reloc_signed_4byte_relax:
case X86::reloc_global_offset_table:
case X86::reloc_branch_4byte_pcrel:
case FK_SecRel_4:
case FK_Data_4:
return 2;
@ -86,6 +87,7 @@ public:
{"reloc_signed_4byte_relax", 0, 32, 0},
{"reloc_global_offset_table", 0, 32, 0},
{"reloc_global_offset_table8", 0, 64, 0},
{"reloc_branch_4byte_pcrel", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
};
if (Kind < FirstTargetFixupKind)
@ -93,6 +95,7 @@ public:
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
"Invalid kind!");
assert(Infos[Kind - FirstTargetFixupKind].Name && "Empty fixup name!");
return Infos[Kind - FirstTargetFixupKind];
}

3
llvm/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
View File

@ -75,6 +75,9 @@ static X86_64RelType getType64(unsigned Kind,
case X86::reloc_riprel_4byte_relax_rex:
case X86::reloc_riprel_4byte_movq_load:
return RT64_32;
case X86::reloc_branch_4byte_pcrel:
Modifier = MCSymbolRefExpr::VK_PLT;
return RT64_32;
case FK_PCRel_2:
case FK_Data_2:
return RT64_16;

1
llvm/lib/Target/X86/MCTargetDesc/X86FixupKinds.h
View File

@ -30,6 +30,7 @@ enum Fixups {
// of the instruction. Used only
// for _GLOBAL_OFFSET_TABLE_.
reloc_global_offset_table8, // 64-bit variant.
reloc_branch_4byte_pcrel, // 32-bit PC relative branch.
// Marker
LastTargetFixupKind,
NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind

32
llvm/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
View File

@ -152,6 +152,8 @@ public:
uint8_t DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
int MemOperand, const MCInstrDesc &Desc) const;
bool isPCRel32Branch(const MCInst &MI) const;
};
} // end anonymous namespace
@ -276,6 +278,22 @@ static bool HasSecRelSymbolRef(const MCExpr *Expr) {
return false;
}
bool X86MCCodeEmitter::isPCRel32Branch(const MCInst &MI) const {
unsigned Opcode = MI.getOpcode();
const MCInstrDesc &Desc = MCII.get(Opcode);
if ((Opcode != X86::CALL64pcrel32 && Opcode != X86::JMP_4) ||
getImmFixupKind(Desc.TSFlags) != FK_PCRel_4)
return false;
unsigned CurOp = X86II::getOperandBias(Desc);
const MCOperand &Op = MI.getOperand(CurOp);
if (!Op.isExpr())
return false;
const MCSymbolRefExpr *Ref = dyn_cast<MCSymbolRefExpr>(Op.getExpr());
return Ref && Ref->getKind() == MCSymbolRefExpr::VK_None;
}
void X86MCCodeEmitter::
EmitImmediate(const MCOperand &DispOp, SMLoc Loc, unsigned Size,
MCFixupKind FixupKind, unsigned &CurByte, raw_ostream &OS,
@ -331,7 +349,8 @@ EmitImmediate(const MCOperand &DispOp, SMLoc Loc, unsigned Size,
FixupKind == MCFixupKind(X86::reloc_riprel_4byte) ||
FixupKind == MCFixupKind(X86::reloc_riprel_4byte_movq_load) ||
FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax) ||
FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax_rex))
FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax_rex) ||
FixupKind == MCFixupKind(X86::reloc_branch_4byte_pcrel))
ImmOffset -= 4;
if (FixupKind == FK_PCRel_2)
ImmOffset -= 2;
@ -1287,9 +1306,18 @@ encodeInstruction(const MCInst &MI, raw_ostream &OS,
EmitByte(BaseOpcode, CurByte, OS);
break;
}
case X86II::RawFrm:
case X86II::RawFrm: {
EmitByte(BaseOpcode, CurByte, OS);
if (!is64BitMode(STI) || !isPCRel32Branch(MI))
break;
const MCOperand &Op = MI.getOperand(CurOp++);
EmitImmediate(Op, MI.getLoc(), X86II::getSizeOfImm(TSFlags),
MCFixupKind(X86::reloc_branch_4byte_pcrel), CurByte, OS,
Fixups);
break;
}
case X86II::RawFrmMemOffs:
// Emit segment override opcode prefix as needed.
EmitSegmentOverridePrefix(CurByte, 1, MI, OS);

1
llvm/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
View File

@ -94,6 +94,7 @@ static unsigned getFixupKindLog2Size(unsigned Kind) {
case X86::reloc_riprel_4byte_movq_load:
case X86::reloc_signed_4byte:
case X86::reloc_signed_4byte_relax:
case X86::reloc_branch_4byte_pcrel:
case FK_Data_4: return 2;
case FK_Data_8: return 3;
}

1
llvm/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
View File

@ -62,6 +62,7 @@ unsigned X86WinCOFFObjectWriter::getRelocType(MCContext &Ctx,
case X86::reloc_riprel_4byte_movq_load:
case X86::reloc_riprel_4byte_relax:
case X86::reloc_riprel_4byte_relax_rex:
case X86::reloc_branch_4byte_pcrel:
return COFF::IMAGE_REL_AMD64_REL32;
case FK_Data_4:
case X86::reloc_signed_4byte:

2
llvm/test/CodeGen/X86/cmp.ll
View File

@ -240,7 +240,7 @@ define i32 @test12() ssp uwtable {
; CHECK-NEXT: pushq %rax # encoding: [0x50]
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: callq test12b # encoding: [0xe8,A,A,A,A]
; CHECK-NEXT: # fixup A - offset: 1, value: test12b-4, kind: FK_PCRel_4
; CHECK-NEXT: # fixup A - offset: 1, value: test12b-4, kind: reloc_branch_4byte_pcrel
; CHECK-NEXT: testb %al, %al # encoding: [0x84,0xc0]
; CHECK-NEXT: je .LBB12_2 # encoding: [0x74,A]
; CHECK-NEXT: # fixup A - offset: 1, value: .LBB12_2-1, kind: FK_PCRel_1

8
llvm/test/CodeGen/X86/fma.ll
View File

@ -137,7 +137,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
; FMA64-NEXT: fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
; FMA64-NEXT: fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
; FMA64-NEXT: callq _fmal ## encoding: [0xe8,A,A,A,A]
; FMA64-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
; FMA64-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
; FMA64-NEXT: addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
; FMA64-NEXT: retq ## encoding: [0xc3]
;
@ -151,7 +151,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
; FMACALL64-NEXT: fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
; FMACALL64-NEXT: fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
; FMACALL64-NEXT: callq _fmal ## encoding: [0xe8,A,A,A,A]
; FMACALL64-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
; FMACALL64-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
; FMACALL64-NEXT: addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
; FMACALL64-NEXT: retq ## encoding: [0xc3]
;
@ -165,7 +165,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
; AVX512-NEXT: fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
; AVX512-NEXT: fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
; AVX512-NEXT: callq _fmal ## encoding: [0xe8,A,A,A,A]
; AVX512-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
; AVX512-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
; AVX512-NEXT: addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
; AVX512-NEXT: retq ## encoding: [0xc3]
;
@ -179,7 +179,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
; AVX512VL-NEXT: fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
; AVX512VL-NEXT: fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
; AVX512VL-NEXT: callq _fmal ## encoding: [0xe8,A,A,A,A]
; AVX512VL-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
; AVX512VL-NEXT: ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
; AVX512VL-NEXT: addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
; AVX512VL-NEXT: retq ## encoding: [0xc3]
entry:

4
llvm/test/CodeGen/X86/x86-interrupt_cc.ll
View File

@ -161,7 +161,7 @@ define x86_intrcc void @foo(i8* %frame) {
; CHECK64-KNL-NEXT: .cfi_offset %k7, -82
; CHECK64-KNL-NEXT: cld ## encoding: [0xfc]
; CHECK64-KNL-NEXT: callq _bar ## encoding: [0xe8,A,A,A,A]
; CHECK64-KNL-NEXT: ## fixup A - offset: 1, value: _bar-4, kind: FK_PCRel_4
; CHECK64-KNL-NEXT: ## fixup A - offset: 1, value: _bar-4, kind: reloc_branch_4byte_pcrel
; CHECK64-KNL-NEXT: vmovups (%rsp), %zmm0 ## 64-byte Reload
; CHECK64-KNL-NEXT: ## encoding: [0x62,0xf1,0x7c,0x48,0x10,0x04,0x24]
; CHECK64-KNL-NEXT: vmovups {{[0-9]+}}(%rsp), %zmm1 ## 64-byte Reload
@ -410,7 +410,7 @@ define x86_intrcc void @foo(i8* %frame) {
; CHECK64-SKX-NEXT: cld ## encoding: [0xfc]
; CHECK64-SKX-NEXT: vzeroupper ## encoding: [0xc5,0xf8,0x77]
; CHECK64-SKX-NEXT: callq _bar ## encoding: [0xe8,A,A,A,A]
; CHECK64-SKX-NEXT: ## fixup A - offset: 1, value: _bar-4, kind: FK_PCRel_4
; CHECK64-SKX-NEXT: ## fixup A - offset: 1, value: _bar-4, kind: reloc_branch_4byte_pcrel
; CHECK64-SKX-NEXT: vmovups (%rsp), %zmm0 ## 64-byte Reload
; CHECK64-SKX-NEXT: ## encoding: [0x62,0xf1,0x7c,0x48,0x10,0x04,0x24]
; CHECK64-SKX-NEXT: vmovups {{[0-9]+}}(%rsp), %zmm1 ## 64-byte Reload

18
llvm/test/MC/ELF/basic-elf-64.s
View File

@ -13,6 +13,7 @@ main: # @main
callq puts
xorl %eax, %eax
addq $8, %rsp
call foo@GOTPCREL
ret
.Ltmp0:
.size main, .Ltmp0-main
@ -44,14 +45,15 @@ main: # @main
// CHECK: Name: .rela.text
// CHECK: Relocations [
// CHECK: Section {{.*}} .rela.text {
// CHECK: 0x5 R_X86_64_32 .rodata.str1.1 0x0
// CHECK: 0xA R_X86_64_PC32 puts 0xFFFFFFFFFFFFFFFC
// CHECK: 0xF R_X86_64_32 .rodata.str1.1 0x6
// CHECK: 0x14 R_X86_64_PC32 puts 0xFFFFFFFFFFFFFFFC
// CHECK: }
// CHECK: ]
// CHECK: Relocations [
// CHECK: Section {{.*}} .rela.text {
// CHECK-NEXT: 0x5 R_X86_64_32 .rodata.str1.1 0x0
// CHECK-NEXT: 0xA R_X86_64_PLT32 puts 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0xF R_X86_64_32 .rodata.str1.1 0x6
// CHECK-NEXT: 0x14 R_X86_64_PLT32 puts 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x1F R_X86_64_GOTPCREL foo 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: }
// CHECK-NEXT: ]
// CHECK: Symbol {
// CHECK: Binding: Local

2
llvm/test/MC/ELF/ifunc-reloc.s
View File

@ -11,6 +11,6 @@ alias:
// CHECK: Relocations [
// CHECK-NEXT: Section {{.*}} .rela.text {
// CHECK-NEXT: 0x1 R_X86_64_PC32 sym 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x1 R_X86_64_PLT32 sym 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: }
// CHECK-NEXT: ]

2
llvm/test/MC/ELF/weak-diff.s
View File

@ -2,7 +2,7 @@
// CHECK: Relocations [
// CHECK-NEXT: Section ({{.*}}) .rela.text {
// CHECK-NEXT: 0x1D R_X86_64_PC32 f2 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x1D R_X86_64_PLT32 f2 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: }
// CHECK-NEXT: ]

2
llvm/test/MC/ELF/weak-relocation.s
View File

@ -9,6 +9,6 @@ bar:
// CHECK: Relocations [
// CHECK-NEXT: Section ({{[0-9]+}}) .rela.text {
// CHECK-NEXT: 0x1 R_X86_64_PC32 foo 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x1 R_X86_64_PLT32 foo 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: }
// CHECK-NEXT: ]

2
llvm/test/MC/ELF/weakref-reloc.s
View File

@ -9,6 +9,6 @@
// CHECK: Relocations [
// CHECK-NEXT: Section ({{[0-9]+}}) {{[^ ]+}} {
// CHECK-NEXT: 0x1 R_X86_64_PLT32 zed 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x6 R_X86_64_PC32 foo 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: 0x6 R_X86_64_PLT32 foo 0xFFFFFFFFFFFFFFFC
// CHECK-NEXT: }
// CHECK-NEXT: ]