[llvm-commits] [compiler-rt] r85531 - in /compiler-rt/trunk: lib/arm/save_restore_d8_d15.S make/AppleBI.mk

[Nick Kledzik]

Author: kledzik
Date: Thu Oct 29 17:31:39 2009
New Revision: 85531

URL: http://llvm.org/viewvc/llvm-project?rev=85531&view=rev
Log:
add __save_vfp_d8_d15_regs and __restore_vfp_d8_d15_regs for ARM

Added:
    compiler-rt/trunk/lib/arm/save_restore_d8_d15.S
Modified:
    compiler-rt/trunk/make/AppleBI.mk

Added: compiler-rt/trunk/lib/arm/save_restore_d8_d15.S
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/arm/save_restore_d8_d15.S?rev=85531&view=auto

==============================================================================
--- compiler-rt/trunk/lib/arm/save_restore_d8_d15.S (added)
+++ compiler-rt/trunk/lib/arm/save_restore_d8_d15.S Thu Oct 29 17:31:39 2009
@@ -0,0 +1,45 @@
+//===-- 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
+//
+DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
+	vstmdb	sp!, {d8-d15}           // push registers d8-d15 onto stack
+	bx      lr                      // return to prolog
+
+
+
+//
+// Restore registers d8-d15 from stack
+//
+DEFINE_COMPILERRT_PRIVATE_FUNCTION(__restore_vfp_d8_d15_regs)
+	vldmia	sp!, {d8-d15}           // pop registers d8-d15 off stack
+	bx      lr                      // return to prolog
+
+
+
+	// tell linker it can break up file at label boundaries
+	.subsections_via_symbols
+	

Modified: compiler-rt/trunk/make/AppleBI.mk
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/make/AppleBI.mk?rev=85531&r1=85530&r2=85531&view=diff

==============================================================================
--- compiler-rt/trunk/make/AppleBI.mk (original)
+++ compiler-rt/trunk/make/AppleBI.mk Thu Oct 29 17:31:39 2009
@@ -58,7 +58,7 @@
 				muldf3vfp.o mulsf3vfp.o \
 				nedf2vfp.o negdf2vfp.o negsf2vfp.o nesf2vfp.o \
 				subdf3vfp.o subsf3vfp.o truncdfsf2vfp.o unorddf2vfp.o unordsf2vfp.o \
-				modsi3.o umodsi3.o udivsi3.o divsi3.o switch.o
+				modsi3.o umodsi3.o udivsi3.o divsi3.o switch.o save_restore_d8_d15.o
 
 
 # copies any public headers to DSTROOT