mirror of https://github.com/acidanthera/audk.git
49 lines
1.3 KiB
ArmAsm
49 lines
1.3 KiB
ArmAsm
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2011-2014, ARM Limited. All rights reserved.
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#------------------------------------------------------------------------------
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.text
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.align 2
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GCC_ASM_EXPORT (memmove)
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# VOID
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# EFIAPI
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# memmove (
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# IN VOID *Destination,
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# IN CONST VOID *Source,
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# IN UINT32 Size
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# );
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ASM_PFX(memmove):
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CMP r2, #0
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BXEQ lr
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CMP r0, r1
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BXEQ lr
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BHI memmove_backward
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memmove_forward:
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LDRB r3, [r1], #1
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STRB r3, [r0], #1
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SUBS r2, r2, #1
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BXEQ lr
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B memmove_forward
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memmove_backward:
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add r0, r2
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add r1, r2
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memmove_backward_loop:
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LDRB r3, [r1, #-1]!
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STRB r3, [r0, #-1]!
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SUBS r2, r2, #1
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BXEQ lr
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B memmove_backward_loop
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