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//===-- 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
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