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Support segmented stacks on mac.
This uses TLS slot 90, which actually belongs to JavaScriptCore. We only support frames with static size Patch by Brian Anderson. llvm-svn: 147960
This commit is contained in:
Rafael Espindola
parent
431029d375
commit
cd3a456eef
@ -1298,10 +1298,15 @@ HasNestArgument(const MachineFunction *MF) {
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return false;
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}
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/// GetScratchRegister - Get a register for performing work in the segmented
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/// stack prologue. Depending on platform and the properties of the function
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/// either one or two registers will be needed. Set primary to true for
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/// the first register, false for the second.
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static unsigned
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GetScratchRegister(bool Is64Bit, const MachineFunction &MF) {
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GetScratchRegister(bool Is64Bit, const MachineFunction &MF, bool Primary) {
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if (Is64Bit) {
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return X86::R11;
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return Primary ? X86::R11 : X86::R12;
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} else {
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CallingConv::ID CallingConvention = MF.getFunction()->getCallingConv();
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bool IsNested = HasNestArgument(&MF);
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@ -1313,13 +1318,13 @@ GetScratchRegister(bool Is64Bit, const MachineFunction &MF) {
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"nested function.");
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return -1;
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} else {
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return X86::EAX;
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return Primary ? X86::EAX : X86::ECX;
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}
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} else {
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if (IsNested)
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return X86::EDX;
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return Primary ? X86::EDX : X86::EAX;
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else
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return X86::ECX;
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return Primary ? X86::ECX : X86::EAX;
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}
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}
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}
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@ -1339,14 +1344,14 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
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DebugLoc DL;
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const X86Subtarget *ST = &MF.getTarget().getSubtarget<X86Subtarget>();
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unsigned ScratchReg = GetScratchRegister(Is64Bit, MF);
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unsigned ScratchReg = GetScratchRegister(Is64Bit, MF, true);
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assert(!MF.getRegInfo().isLiveIn(ScratchReg) &&
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"Scratch register is live-in");
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if (MF.getFunction()->isVarArg())
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report_fatal_error("Segmented stacks do not support vararg functions.");
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if (!ST->isTargetLinux())
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report_fatal_error("Segmented stacks supported only on linux.");
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if (!ST->isTargetLinux() && !ST->isTargetDarwin())
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report_fatal_error("Segmented stacks supported only on linux and darwin.");
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MachineBasicBlock *allocMBB = MF.CreateMachineBasicBlock();
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MachineBasicBlock *checkMBB = MF.CreateMachineBasicBlock();
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@ -1377,12 +1382,21 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
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// prologue.
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StackSize = MFI->getStackSize();
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// When the frame size is less than 256 we just compare the stack
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// boundary directly to the value of the stack pointer, per gcc.
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bool CompareStackPointer = StackSize < kSplitStackAvailable;
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// Read the limit off the current stacklet off the stack_guard location.
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if (Is64Bit) {
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TlsReg = X86::FS;
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TlsOffset = 0x70;
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if (ST->isTargetLinux()) {
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TlsReg = X86::FS;
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TlsOffset = 0x70;
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} else if (ST->isTargetDarwin()) {
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TlsReg = X86::GS;
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TlsOffset = 0x60 + 90*8; // See pthread_machdep.h. Steal TLS slot 90.
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}
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if (StackSize < kSplitStackAvailable)
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if (CompareStackPointer)
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ScratchReg = X86::RSP;
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else
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BuildMI(checkMBB, DL, TII.get(X86::LEA64r), ScratchReg).addReg(X86::RSP)
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@ -1392,16 +1406,55 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
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.addReg(0).addImm(1).addReg(0).addImm(TlsOffset).addReg(TlsReg);
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} else {
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TlsReg = X86::GS;
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TlsOffset = 0x30;
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if (StackSize < kSplitStackAvailable)
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if (CompareStackPointer)
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ScratchReg = X86::ESP;
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else
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BuildMI(checkMBB, DL, TII.get(X86::LEA32r), ScratchReg).addReg(X86::ESP)
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.addImm(1).addReg(0).addImm(-StackSize).addReg(0);
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BuildMI(checkMBB, DL, TII.get(X86::CMP32rm)).addReg(ScratchReg)
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.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);
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if (ST->isTargetLinux()) {
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TlsOffset = 0x30;
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BuildMI(checkMBB, DL, TII.get(X86::CMP32rm)).addReg(ScratchReg)
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.addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);
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} else if (ST->isTargetDarwin()) {
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TlsOffset = 0x48 + 90*4;
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// TlsOffset doesn't fit into a mod r/m byte so we need an extra register
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unsigned ScratchReg2;
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bool SaveScratch2;
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if (CompareStackPointer) {
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// The primary scratch register is available for holding the TLS offset
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ScratchReg2 = GetScratchRegister(Is64Bit, MF, true);
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SaveScratch2 = false;
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} else {
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// Need to use a second register to hold the TLS offset
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ScratchReg2 = GetScratchRegister(Is64Bit, MF, false);
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// Unfortunately, with fastcc the second scratch register may hold an arg
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SaveScratch2 = MF.getRegInfo().isLiveIn(ScratchReg2);
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}
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// If Scratch2 is live-in then it needs to be saved
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assert((!MF.getRegInfo().isLiveIn(ScratchReg2) || SaveScratch2) &&
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"Scratch register is live-in and not saved");
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if (SaveScratch2)
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BuildMI(checkMBB, DL, TII.get(X86::PUSH32r))
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.addReg(ScratchReg2, RegState::Kill);
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BuildMI(checkMBB, DL, TII.get(X86::MOV32ri), ScratchReg2)
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.addImm(TlsOffset);
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BuildMI(checkMBB, DL, TII.get(X86::CMP32rm))
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.addReg(ScratchReg)
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.addReg(ScratchReg2).addImm(1).addReg(0)
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.addImm(0)
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.addReg(TlsReg);
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if (SaveScratch2)
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BuildMI(checkMBB, DL, TII.get(X86::POP32r), ScratchReg2);
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}
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}
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// This jump is taken if SP >= (Stacklet Limit + Stack Space required).
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@ -102,9 +102,6 @@ X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT,
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// default to hard float ABI
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if (Options.FloatABIType == FloatABI::Default)
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this->Options.FloatABIType = FloatABI::Hard;
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if (Options.EnableSegmentedStacks && !Subtarget.isTargetELF())
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report_fatal_error("Segmented stacks are only implemented on ELF.");
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}
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//===----------------------------------------------------------------------===//
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@ -1,9 +1,13 @@
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; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32
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; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64
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; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-Linux
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; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-Linux
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; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-Darwin
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; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-Darwin
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; We used to crash with filetype=obj
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; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -filetype=obj
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; RUN: llc < %s -mtriple=x86_64-linux -segmented-stacks -filetype=obj
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; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -filetype=obj
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; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -filetype=obj
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; Just to prevent the alloca from being optimized away
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declare void @dummy_use(i32*, i32)
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@ -13,25 +17,46 @@ define void @test_basic() {
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call void @dummy_use (i32* %mem, i32 10)
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ret void
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; X32: test_basic:
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; X32-Linux: test_basic:
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; X32: cmpl %gs:48, %esp
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; X32-NEXT: ja .LBB0_2
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; X32-Linux: cmpl %gs:48, %esp
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; X32-Linux-NEXT: ja .LBB0_2
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; X32: pushl $0
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; X32-NEXT: pushl $60
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; X32-NEXT: calll __morestack
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; X32-NEXT: ret
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; X32-Linux: pushl $0
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; X32-Linux-NEXT: pushl $60
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; X32-Linux-NEXT: calll __morestack
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; X32-Linux-NEXT: ret
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; X64: test_basic:
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; X64-Linux: test_basic:
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; X64: cmpq %fs:112, %rsp
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; X64-NEXT: ja .LBB0_2
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; X64-Linux: cmpq %fs:112, %rsp
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; X64-Linux-NEXT: ja .LBB0_2
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; X64: movabsq $40, %r10
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; X64-NEXT: movabsq $0, %r11
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; X64-NEXT: callq __morestack
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; X64-NEXT: ret
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; X64-Linux: movabsq $40, %r10
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; X64-Linux-NEXT: movabsq $0, %r11
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; X64-Linux-NEXT: callq __morestack
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; X64-Linux-NEXT: ret
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; X32-Darwin: test_basic:
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; X32-Darwin: movl $432, %ecx
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; X32-Darwin-NEXT: cmpl %gs:(%ecx), %esp
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; X32-Darwin-NEXT: ja LBB0_2
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; X32-Darwin: pushl $0
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; X32-Darwin-NEXT: pushl $60
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; X32-Darwin-NEXT: calll ___morestack
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; X32-Darwin-NEXT: ret
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; X64-Darwin: test_basic:
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; X64-Darwin: cmpq %gs:816, %rsp
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; X64-Darwin-NEXT: ja LBB0_2
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; X64-Darwin: movabsq $40, %r10
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; X64-Darwin-NEXT: movabsq $0, %r11
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; X64-Darwin-NEXT: callq ___morestack
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; X64-Darwin-NEXT: ret
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}
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@ -40,23 +65,42 @@ define i32 @test_nested(i32 * nest %closure, i32 %other) {
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%result = add i32 %other, %addend
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ret i32 %result
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; X32: cmpl %gs:48, %esp
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; X32-NEXT: ja .LBB1_2
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; X32-Linux: cmpl %gs:48, %esp
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; X32-Linux-NEXT: ja .LBB1_2
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; X32: pushl $4
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; X32-NEXT: pushl $0
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; X32-NEXT: calll __morestack
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; X32-NEXT: ret
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; X32-Linux: pushl $4
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; X32-Linux-NEXT: pushl $0
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; X32-Linux-NEXT: calll __morestack
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; X32-Linux-NEXT: ret
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; X64: cmpq %fs:112, %rsp
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; X64-NEXT: ja .LBB1_2
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; X64-Linux: cmpq %fs:112, %rsp
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; X64-Linux-NEXT: ja .LBB1_2
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; X64: movq %r10, %rax
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; X64-NEXT: movabsq $0, %r10
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; X64-NEXT: movabsq $0, %r11
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; X64-NEXT: callq __morestack
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; X64-NEXT: ret
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; X64-NEXT: movq %rax, %r10
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; X64-Linux: movq %r10, %rax
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; X64-Linux-NEXT: movabsq $0, %r10
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; X64-Linux-NEXT: movabsq $0, %r11
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; X64-Linux-NEXT: callq __morestack
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; X64-Linux-NEXT: ret
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; X64-Linux-NEXT: movq %rax, %r10
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; X32-Darwin: movl $432, %edx
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; X32-Darwin-NEXT: cmpl %gs:(%edx), %esp
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; X32-Darwin-NEXT: ja LBB1_2
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; X32-Darwin: pushl $4
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; X32-Darwin-NEXT: pushl $0
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; X32-Darwin-NEXT: calll ___morestack
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; X32-Darwin-NEXT: ret
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; X64-Darwin: cmpq %gs:816, %rsp
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; X64-Darwin-NEXT: ja LBB1_2
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; X64-Darwin: movq %r10, %rax
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; X64-Darwin-NEXT: movabsq $0, %r10
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; X64-Darwin-NEXT: movabsq $0, %r11
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; X64-Darwin-NEXT: callq ___morestack
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; X64-Darwin-NEXT: ret
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; X64-Darwin-NEXT: movq %rax, %r10
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}
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@ -65,23 +109,42 @@ define void @test_large() {
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call void @dummy_use (i32* %mem, i32 0)
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ret void
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; X32: leal -40012(%esp), %ecx
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; X32-NEXT: cmpl %gs:48, %ecx
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; X32-NEXT: ja .LBB2_2
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; X32-Linux: leal -40012(%esp), %ecx
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; X32-Linux-NEXT: cmpl %gs:48, %ecx
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; X32-Linux-NEXT: ja .LBB2_2
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; X32: pushl $0
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; X32-NEXT: pushl $40012
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; X32-NEXT: calll __morestack
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; X32-NEXT: ret
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; X32-Linux: pushl $0
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; X32-Linux-NEXT: pushl $40012
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; X32-Linux-NEXT: calll __morestack
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; X32-Linux-NEXT: ret
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; X64: leaq -40008(%rsp), %r11
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; X64-NEXT: cmpq %fs:112, %r11
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; X64-NEXT: ja .LBB2_2
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; X64-Linux: leaq -40008(%rsp), %r11
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; X64-Linux-NEXT: cmpq %fs:112, %r11
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; X64-Linux-NEXT: ja .LBB2_2
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; X64: movabsq $40008, %r10
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; X64-NEXT: movabsq $0, %r11
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; X64-NEXT: callq __morestack
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; X64-NEXT: ret
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; X64-Linux: movabsq $40008, %r10
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; X64-Linux-NEXT: movabsq $0, %r11
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; X64-Linux-NEXT: callq __morestack
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; X64-Linux-NEXT: ret
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; X32-Darwin: leal -40012(%esp), %ecx
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; X32-Darwin-NEXT: movl $432, %eax
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; X32-Darwin-NEXT: cmpl %gs:(%eax), %ecx
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; X32-Darwin-NEXT: ja LBB2_2
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; X32-Darwin: pushl $0
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; X32-Darwin-NEXT: pushl $40012
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; X32-Darwin-NEXT: calll ___morestack
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; X32-Darwin-NEXT: ret
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; X64-Darwin: leaq -40008(%rsp), %r11
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; X64-Darwin-NEXT: cmpq %gs:816, %r11
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; X64-Darwin-NEXT: ja LBB2_2
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; X64-Darwin: movabsq $40008, %r10
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; X64-Darwin-NEXT: movabsq $0, %r11
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; X64-Darwin-NEXT: callq ___morestack
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; X64-Darwin-NEXT: ret
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}
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@ -90,25 +153,46 @@ define fastcc void @test_fastcc() {
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call void @dummy_use (i32* %mem, i32 10)
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ret void
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; X32: test_fastcc:
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; X32-Linux: test_fastcc:
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; X32: cmpl %gs:48, %esp
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; X32-NEXT: ja .LBB3_2
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; X32-Linux: cmpl %gs:48, %esp
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; X32-Linux-NEXT: ja .LBB3_2
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; X32: pushl $0
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; X32-NEXT: pushl $60
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; X32-NEXT: calll __morestack
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; X32-NEXT: ret
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; X32-Linux: pushl $0
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; X32-Linux-NEXT: pushl $60
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; X32-Linux-NEXT: calll __morestack
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; X32-Linux-NEXT: ret
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; X64: test_fastcc:
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; X64-Linux: test_fastcc:
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; X64: cmpq %fs:112, %rsp
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; X64-NEXT: ja .LBB3_2
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; X64-Linux: cmpq %fs:112, %rsp
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; X64-Linux-NEXT: ja .LBB3_2
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; X64: movabsq $40, %r10
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; X64-NEXT: movabsq $0, %r11
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; X64-NEXT: callq __morestack
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; X64-NEXT: ret
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; X64-Linux: movabsq $40, %r10
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; X64-Linux-NEXT: movabsq $0, %r11
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; X64-Linux-NEXT: callq __morestack
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; X64-Linux-NEXT: ret
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; X32-Darwin: test_fastcc:
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; X32-Darwin: movl $432, %eax
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; X32-Darwin-NEXT: cmpl %gs:(%eax), %esp
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; X32-Darwin-NEXT: ja LBB3_2
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; X32-Darwin: pushl $0
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; X32-Darwin-NEXT: pushl $60
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; X32-Darwin-NEXT: calll ___morestack
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; X32-Darwin-NEXT: ret
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; X64-Darwin: test_fastcc:
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; X64-Darwin: cmpq %gs:816, %rsp
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; X64-Darwin-NEXT: ja LBB3_2
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; X64-Darwin: movabsq $40, %r10
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; X64-Darwin-NEXT: movabsq $0, %r11
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; X64-Darwin-NEXT: callq ___morestack
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; X64-Darwin-NEXT: ret
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}
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@ -117,25 +201,72 @@ define fastcc void @test_fastcc_large() {
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call void @dummy_use (i32* %mem, i32 0)
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ret void
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||||
|
||||
; X32: test_fastcc_large:
|
||||
; X32-Linux: test_fastcc_large:
|
||||
|
||||
; X32: leal -40012(%esp), %eax
|
||||
; X32-NEXT: cmpl %gs:48, %eax
|
||||
; X32-NEXT: ja .LBB4_2
|
||||
; X32-Linux: leal -40012(%esp), %eax
|
||||
; X32-Linux-NEXT: cmpl %gs:48, %eax
|
||||
; X32-Linux-NEXT: ja .LBB4_2
|
||||
|
||||
; X32: pushl $0
|
||||
; X32-NEXT: pushl $40012
|
||||
; X32-NEXT: calll __morestack
|
||||
; X32-NEXT: ret
|
||||
; X32-Linux: pushl $0
|
||||
; X32-Linux-NEXT: pushl $40012
|
||||
; X32-Linux-NEXT: calll __morestack
|
||||
; X32-Linux-NEXT: ret
|
||||
|
||||
; X64: test_fastcc_large:
|
||||
; X64-Linux: test_fastcc_large:
|
||||
|
||||
; X64: leaq -40008(%rsp), %r11
|
||||
; X64-NEXT: cmpq %fs:112, %r11
|
||||
; X64-NEXT: ja .LBB4_2
|
||||
; X64-Linux: leaq -40008(%rsp), %r11
|
||||
; X64-Linux-NEXT: cmpq %fs:112, %r11
|
||||
; X64-Linux-NEXT: ja .LBB4_2
|
||||
|
||||
; X64-Linux: movabsq $40008, %r10
|
||||
; X64-Linux-NEXT: movabsq $0, %r11
|
||||
; X64-Linux-NEXT: callq __morestack
|
||||
; X64-Linux-NEXT: ret
|
||||
|
||||
; X32-Darwin: test_fastcc_large:
|
||||
|
||||
; X32-Darwin: leal -40012(%esp), %eax
|
||||
; X32-Darwin-NEXT: movl $432, %ecx
|
||||
; X32-Darwin-NEXT: cmpl %gs:(%ecx), %eax
|
||||
; X32-Darwin-NEXT: ja LBB4_2
|
||||
|
||||
; X32-Darwin: pushl $0
|
||||
; X32-Darwin-NEXT: pushl $40012
|
||||
; X32-Darwin-NEXT: calll ___morestack
|
||||
; X32-Darwin-NEXT: ret
|
||||
|
||||
; X64-Darwin: test_fastcc_large:
|
||||
|
||||
; X64-Darwin: leaq -40008(%rsp), %r11
|
||||
; X64-Darwin-NEXT: cmpq %gs:816, %r11
|
||||
; X64-Darwin-NEXT: ja LBB4_2
|
||||
|
||||
; X64-Darwin: movabsq $40008, %r10
|
||||
; X64-Darwin-NEXT: movabsq $0, %r11
|
||||
; X64-Darwin-NEXT: callq ___morestack
|
||||
; X64-Darwin-NEXT: ret
|
||||
|
||||
}
|
||||
|
||||
define fastcc void @test_fastcc_large_with_ecx_arg(i32 %a) {
|
||||
%mem = alloca i32, i32 10000
|
||||
call void @dummy_use (i32* %mem, i32 %a)
|
||||
ret void
|
||||
|
||||
; This is testing that the Mac implementation preserves ecx
|
||||
|
||||
; X32-Darwin: test_fastcc_large_with_ecx_arg:
|
||||
|
||||
; X32-Darwin: leal -40012(%esp), %eax
|
||||
; X32-Darwin-NEXT: pushl %ecx
|
||||
; X32-Darwin-NEXT: movl $432, %ecx
|
||||
; X32-Darwin-NEXT: cmpl %gs:(%ecx), %eax
|
||||
; X32-Darwin-NEXT: popl %ecx
|
||||
; X32-Darwin-NEXT: ja LBB5_2
|
||||
|
||||
; X32-Darwin: pushl $0
|
||||
; X32-Darwin-NEXT: pushl $40012
|
||||
; X32-Darwin-NEXT: calll ___morestack
|
||||
; X32-Darwin-NEXT: ret
|
||||
|
||||
; X64: movabsq $40008, %r10
|
||||
; X64-NEXT: movabsq $0, %r11
|
||||
; X64-NEXT: callq __morestack
|
||||
; X64-NEXT: ret
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user