Import libcompiler_rt into HEAD and add Makefiles.

Obtained from:	user/ed/compiler-rt

1 files changed, 35 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/arm/save_vfp_d8_d15_regs.S b/contrib/compiler-rt/lib/arm/save_vfp_d8_d15_regs.S
new file mode 100644
index 0000000..92de61b
--- /dev/null
+++ b/contrib/compiler-rt/lib/arm/save_vfp_d8_d15_regs.S
@@ -0,0 +1,35 @@
+//===-- save_restore_regs.S - Implement save/restore* ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "../assembly.h"
+
+//
+// When compiling C++ functions that need to handle thrown exceptions the
+// compiler is required to save all registers and call __Unwind_SjLj_Register
+// in the function prolog.  But when compiling for thumb1, there are
+// no instructions to access the floating point registers, so the
+// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
+// written in ARM to save the float registers.  In the epilog, the compiler
+// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
+//
+
+	.text
+	.syntax unified
+
+//
+// Save registers d8-d15 onto stack
+//
+	.align 2
+DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
+	vstmdb	sp!, {d8-d15}           // push registers d8-d15 onto stack
+	bx      lr                      // return to prolog
+
+	// tell linker it can break up file at label boundaries
+	.subsections_via_symbols
+