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[rustc.git] / src / compiler-rt / lib / builtins / arm / save_vfp_d8_d15_regs.S
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1//===-- save_restore_regs.S - Implement save/restore* ---------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "../assembly.h"
11
12//
13// When compiling C++ functions that need to handle thrown exceptions the
14// compiler is required to save all registers and call __Unwind_SjLj_Register
15// in the function prolog. But when compiling for thumb1, there are
16// no instructions to access the floating point registers, so the
17// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
18// written in ARM to save the float registers. In the epilog, the compiler
19// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
20//
21
22 .text
23 .syntax unified
24
25//
26// Save registers d8-d15 onto stack
27//
92a42be0 28 .p2align 2
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29DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
30 vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack
31 bx lr // return to prolog
32END_COMPILERRT_FUNCTION(__save_vfp_d8_d15_regs)
33