forked from OSchip/llvm-project
35 lines
1.2 KiB
ArmAsm
35 lines
1.2 KiB
ArmAsm
//===-- save_restore_regs.S - Implement save/restore* ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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//
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// When compiling C++ functions that need to handle thrown exceptions the
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// compiler is required to save all registers and call __Unwind_SjLj_Register
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// in the function prolog. But when compiling for thumb1, there are
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// no instructions to access the floating point registers, so the
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// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
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// written in ARM to save the float registers. In the epilog, the compiler
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// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
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//
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.text
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.syntax unified
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//
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// Save registers d8-d15 onto stack
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//
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.p2align 2
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DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
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vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack
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bx lr // return to prolog
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END_COMPILERRT_FUNCTION(__save_vfp_d8_d15_regs)
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NO_EXEC_STACK_DIRECTIVE
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