//===-- save_restore_regs.S - Implement save/restore* ---------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #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 // .p2align 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 END_COMPILERRT_FUNCTION(__save_vfp_d8_d15_regs) NO_EXEC_STACK_DIRECTIVE |