[Support] Fix building for Windows on ARM

The commit in SVN r310001 that added support for this actually didn't
use the right struct field for the frame pointer - for ARM, there is
no register named Fp in the CONTEXT struct. On Windows, the R11
register is used as frame pointer.

Differential Revision: https://reviews.llvm.org/D45590

llvm-svn: 329991

diff --git a/llvm/lib/Support/Windows/Signals.inc b/llvm/lib/Support/Windows/Signals.inc
index 893d18a..e30522b 100644 (file)
--- a/llvm/lib/Support/Windows/Signals.inc
+++ b/llvm/lib/Support/Windows/Signals.inc
@@ -533,10 +533,14 @@ void llvm::sys::PrintStackTrace(raw_ostream &OS) {
   StackFrame.AddrPC.Offset = Context.Eip;
   StackFrame.AddrStack.Offset = Context.Esp;
   StackFrame.AddrFrame.Offset = Context.Ebp;
-#elif defined(_M_ARM64) || defined(_M_ARM)
+#elif defined(_M_ARM64)
   StackFrame.AddrPC.Offset = Context.Pc;
   StackFrame.AddrStack.Offset = Context.Sp;
   StackFrame.AddrFrame.Offset = Context.Fp;
+#elif defined(_M_ARM)
+  StackFrame.AddrPC.Offset = Context.Pc;
+  StackFrame.AddrStack.Offset = Context.Sp;
+  StackFrame.AddrFrame.Offset = Context.R11;
 #endif
   StackFrame.AddrPC.Mode = AddrModeFlat;
   StackFrame.AddrStack.Mode = AddrModeFlat;
@@ -816,7 +820,11 @@ static LONG WINAPI LLVMUnhandledExceptionFilter(LPEXCEPTION_POINTERS ep) {
   StackFrame.AddrPC.Mode = AddrModeFlat;
   StackFrame.AddrStack.Offset = ep->ContextRecord->Sp;
   StackFrame.AddrStack.Mode = AddrModeFlat;
+#if defined(_M_ARM64)
   StackFrame.AddrFrame.Offset = ep->ContextRecord->Fp;
+#else
+  StackFrame.AddrFrame.Offset = ep->ContextRecord->R11;
+#endif
   StackFrame.AddrFrame.Mode = AddrModeFlat;
 #endif