1 files changed, 28 insertions, 21 deletions
diff --git a/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp b/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
index d183eb5b3eb..24b99e49fc6 100644
--- a/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZFrameLowering.cpp
@@ -21,27 +21,27 @@
 using namespace llvm;
 
 namespace {
-// The ABI-defined register save slots, relative to the incoming stack
-// pointer.
+// The ABI-defined register save slots, relative to the CFA (i.e.
+// incoming stack pointer + SystemZMC::CallFrameSize).
 static const TargetFrameLowering::SpillSlot SpillOffsetTable[] = {
-  { SystemZ::R2D,  0x10 },
-  { SystemZ::R3D,  0x18 },
-  { SystemZ::R4D,  0x20 },
-  { SystemZ::R5D,  0x28 },
-  { SystemZ::R6D,  0x30 },
-  { SystemZ::R7D,  0x38 },
-  { SystemZ::R8D,  0x40 },
-  { SystemZ::R9D,  0x48 },
-  { SystemZ::R10D, 0x50 },
-  { SystemZ::R11D, 0x58 },
-  { SystemZ::R12D, 0x60 },
-  { SystemZ::R13D, 0x68 },
-  { SystemZ::R14D, 0x70 },
-  { SystemZ::R15D, 0x78 },
-  { SystemZ::F0D,  0x80 },
-  { SystemZ::F2D,  0x88 },
-  { SystemZ::F4D,  0x90 },
-  { SystemZ::F6D,  0x98 }
+  { SystemZ::R2D,  -SystemZMC::CallFrameSize + 0x10 },
+  { SystemZ::R3D,  -SystemZMC::CallFrameSize + 0x18 },
+  { SystemZ::R4D,  -SystemZMC::CallFrameSize + 0x20 },
+  { SystemZ::R5D,  -SystemZMC::CallFrameSize + 0x28 },
+  { SystemZ::R6D,  -SystemZMC::CallFrameSize + 0x30 },
+  { SystemZ::R7D,  -SystemZMC::CallFrameSize + 0x38 },
+  { SystemZ::R8D,  -SystemZMC::CallFrameSize + 0x40 },
+  { SystemZ::R9D,  -SystemZMC::CallFrameSize + 0x48 },
+  { SystemZ::R10D, -SystemZMC::CallFrameSize + 0x50 },
+  { SystemZ::R11D, -SystemZMC::CallFrameSize + 0x58 },
+  { SystemZ::R12D, -SystemZMC::CallFrameSize + 0x60 },
+  { SystemZ::R13D, -SystemZMC::CallFrameSize + 0x68 },
+  { SystemZ::R14D, -SystemZMC::CallFrameSize + 0x70 },
+  { SystemZ::R15D, -SystemZMC::CallFrameSize + 0x78 },
+  { SystemZ::F0D,  -SystemZMC::CallFrameSize + 0x80 },
+  { SystemZ::F2D,  -SystemZMC::CallFrameSize + 0x88 },
+  { SystemZ::F4D,  -SystemZMC::CallFrameSize + 0x90 },
+  { SystemZ::F6D,  -SystemZMC::CallFrameSize + 0x98 }
 };
 } // end anonymous namespace
 
@@ -49,10 +49,17 @@ SystemZFrameLowering::SystemZFrameLowering()
     : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(8),
                           -SystemZMC::CallFrameSize, Align(8),
                           false /* StackRealignable */) {
+  // Due to the SystemZ ABI, the DWARF CFA (Canonical Frame Address) is not
+  // equal to the incoming stack pointer, but to incoming stack pointer plus
+  // 160.  The getOffsetOfLocalArea() returned value is interpreted as "the
+  // offset of the local area from the CFA".
+
   // Create a mapping from register number to save slot offset.
+  // These offsets are relative to the start of the register save area.
   RegSpillOffsets.grow(SystemZ::NUM_TARGET_REGS);
   for (unsigned I = 0, E = array_lengthof(SpillOffsetTable); I != E; ++I)
-    RegSpillOffsets[SpillOffsetTable[I].Reg] = SpillOffsetTable[I].Offset;
+    RegSpillOffsets[SpillOffsetTable[I].Reg] =
+      SystemZMC::CallFrameSize + SpillOffsetTable[I].Offset;
 }
 
 const TargetFrameLowering::SpillSlot *