| //===-- save_restore_regs.S - Implement save/restore* ---------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. 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 |
| |
