[PATCH] Add segmented stack support for DragonFlyBSD

[Michael Neumann]

This patch adds support for segmented stacks for DragonFlyBSD. It is required to port the Rust programming language to DragonFly. With this patch rustc can generate code targeted at DragonFly.

http://reviews.llvm.org/D4705

Files:
  lib/Target/X86/X86FrameLowering.cpp
  lib/Target/X86/X86Subtarget.h

Index: lib/Target/X86/X86FrameLowering.cpp
===================================================================
--- lib/Target/X86/X86FrameLowering.cpp
+++ lib/Target/X86/X86FrameLowering.cpp
@@ -1328,7 +1328,8 @@
   if (MF.getFunction()->isVarArg())
     report_fatal_error("Segmented stacks do not support vararg functions.");
   if (!STI.isTargetLinux() && !STI.isTargetDarwin() &&
-      !STI.isTargetWin32() && !STI.isTargetWin64() && !STI.isTargetFreeBSD())
+      !STI.isTargetWin32() && !STI.isTargetWin64() && 
+      !STI.isTargetFreeBSD() && !STI.isTargetDragonFly())
     report_fatal_error("Segmented stacks not supported on this platform.");
 
   // Eventually StackSize will be calculated by a link-time pass; which will
@@ -1382,6 +1383,9 @@
     } else if (STI.isTargetFreeBSD()) {
       TlsReg = X86::FS;
       TlsOffset = 0x18;
+    } else if (STI.isTargetDragonFly()) {
+      TlsReg = X86::FS;
+      TlsOffset = 0x20; // use tls_tcb.tcb_segstack
     } else {
       report_fatal_error("Segmented stacks not supported on this platform.");
     }
@@ -1404,6 +1408,9 @@
     } else if (STI.isTargetWin32()) {
       TlsReg = X86::FS;
       TlsOffset = 0x14; // pvArbitrary, reserved for application use
+    } else if (STI.isTargetDragonFly()) {
+      TlsReg = X86::FS;
+      TlsOffset = 0x10; // use tls_tcb.tcb_segstack
     } else if (STI.isTargetFreeBSD()) {
       report_fatal_error("Segmented stacks not supported on FreeBSD i386.");
     } else {
Index: lib/Target/X86/X86Subtarget.h
===================================================================
--- lib/Target/X86/X86Subtarget.h
+++ lib/Target/X86/X86Subtarget.h
@@ -371,6 +371,9 @@
   bool isTargetFreeBSD() const {
     return TargetTriple.getOS() == Triple::FreeBSD;
   }
+  bool isTargetDragonFly() const {
+    return TargetTriple.getOS() == Triple::DragonFly;
+  }
   bool isTargetSolaris() const {
     return TargetTriple.getOS() == Triple::Solaris;
   }
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