[mirror_edk2.git] / ArmPkg / Library / CompilerIntrinsicsLib / Arm / memmove.asm

//------------------------------------------------------------------------------ 
//
// Copyright (c) 2011, ARM Limited. All rights reserved.
//
// This program and the accompanying materials
// are licensed and made available under the terms and conditions of the BSD License
// which accompanies this distribution.  The full text of the license may be found at
// http://opensource.org/licenses/bsd-license.php
//
// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
//
//------------------------------------------------------------------------------


    EXPORT  __aeabi_memmove

    AREA    Memmove, CODE, READONLY

;
;VOID
;EFIAPI
;__aeabi_memmove (
; IN  VOID          *Destination,
; IN  CONST VOID    *Source,
; IN  UINT32        Size
; );
;
__aeabi_memmove
  CMP     r2, #0
  BXEQ    r14
  CMP     r0, r1
  BXEQ    r14
  BHI     memmove_backward
  BLS     memmove_forward

memmove_forward
  LDRB    r3, [r1], #1
  STRB    r3, [r0], #1
  SUBS    r2, r2, #1
  BXEQ    r14
  B       memmove_forward

memmove_backward
  add     r0, r2
  add     r1, r2
memmove_backward_loop
  LDRB    r3, [r1], #-1
  STRB    r3, [r0], #-1
  SUBS    r2, r2, #-1
  BXEQ    r14
  B       memmove_backward_loop

  END
Commit	Line	Data
796b0b15	1	//------------------------------------------------------------------------------
	2	//
	3	// Copyright (c) 2011, ARM Limited. All rights reserved.
	4	//
	5	// This program and the accompanying materials
	6	// are licensed and made available under the terms and conditions of the BSD License
	7	// which accompanies this distribution. The full text of the license may be found at
	8	// http://opensource.org/licenses/bsd-license.php
	9	//
	10	// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	11	// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
	12	//
	13	//------------------------------------------------------------------------------
	14
	15
	16	EXPORT __aeabi_memmove
	17
	18	AREA Memmove, CODE, READONLY
	19
	20	;
	21	;VOID
	22	;EFIAPI
	23	;__aeabi_memmove (
	24	; IN VOID *Destination,
	25	; IN CONST VOID *Source,
	26	; IN UINT32 Size
	27	; );
	28	;
	29	__aeabi_memmove
	30	CMP r2, #0
	31	BXEQ r14
	32	CMP r0, r1
	33	BXEQ r14
	34	BHI memmove_backward
	35	BLS memmove_forward
	36
	37	memmove_forward
	38	LDRB r3, [r1], #1
	39	STRB r3, [r0], #1
	40	SUBS r2, r2, #1
	41	BXEQ r14
	42	B memmove_forward
	43
	44	memmove_backward
	45	add r0, r2
	46	add r1, r2
	47	memmove_backward_loop
	48	LDRB r3, [r1], #-1
	49	STRB r3, [r0], #-1
	50	SUBS r2, r2, #-1
	51	BXEQ r14
	52	B memmove_backward_loop
	53
	54	END