+ if (ST->isTargetLinux()) {
+ TlsReg = X86::GS;
+ TlsOffset = 0x30;
+ } else if (ST->isTargetDarwin()) {
+ TlsReg = X86::GS;
+ TlsOffset = 0x48 + 90*4;
+ } else if (ST->isTargetWin32()) {
+ TlsReg = X86::FS;
+ TlsOffset = 0x14; // pvArbitrary, reserved for application use
+ } else if (ST->isTargetFreeBSD()) {
+ report_fatal_error("Segmented stacks not supported on FreeBSD i386.");
+ } else {
+ report_fatal_error("Segmented stacks not supported on this platform.");
+ }
+
+ if (CompareStackPointer)
+ ScratchReg = X86::ESP;
+ else
+ BuildMI(checkMBB, DL, TII.get(X86::LEA32r), ScratchReg).addReg(X86::ESP)
+ .addImm(1).addReg(0).addImm(-StackSize).addReg(0);
+
+ if (ST->isTargetLinux() || ST->isTargetWin32()) {
+ BuildMI(checkMBB, DL, TII.get(X86::CMP32rm)).addReg(ScratchReg)
+ .addReg(0).addImm(0).addReg(0).addImm(TlsOffset).addReg(TlsReg);
+ } else if (ST->isTargetDarwin()) {
+
+ // TlsOffset doesn't fit into a mod r/m byte so we need an extra register
+ unsigned ScratchReg2;
+ bool SaveScratch2;
+ if (CompareStackPointer) {
+ // The primary scratch register is available for holding the TLS offset
+ ScratchReg2 = GetScratchRegister(Is64Bit, MF, true);
+ SaveScratch2 = false;
+ } else {
+ // Need to use a second register to hold the TLS offset
+ ScratchReg2 = GetScratchRegister(Is64Bit, MF, false);