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| ;------------------------------------------------------------------------------
| ;
| ; Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>
| ;
| ; SPDX-License-Identifier: BSD-2-Clause-Patent
| ;
| ;------------------------------------------------------------------------------
|
| EXPORT InternalMemZeroMem
| EXPORT InternalMemSetMem
| EXPORT InternalMemSetMem16
| EXPORT InternalMemSetMem32
| EXPORT InternalMemSetMem64
|
| AREA SetMem, CODE, READONLY, CODEALIGN, ALIGN=5
| THUMB
|
| InternalMemSetMem16
| uxth r2, r2
| lsl r1, r1, #1
| orr r2, r2, r2, lsl #16
| b B0
|
| InternalMemSetMem32
| lsl r1, r1, #2
| b B0
|
| InternalMemSetMem64
| lsl r1, r1, #3
| b B1
|
| ALIGN 32
| InternalMemSetMem
| uxtb r2, r2
| orr r2, r2, r2, lsl #8
| orr r2, r2, r2, lsl #16
| b B0
|
| InternalMemZeroMem
| movs r2, #0
| B0
| mov r3, r2
|
| B1
| push {r4, lr}
| cmp r1, #16 ; fewer than 16 bytes of input?
| add r1, r1, r0 ; r1 := dst + length
| add lr, r0, #16
| blt L2
| bic lr, lr, #15 ; align output pointer
|
| str r2, [r0] ; potentially unaligned store of 4 bytes
| str r3, [r0, #4] ; potentially unaligned store of 4 bytes
| str r2, [r0, #8] ; potentially unaligned store of 4 bytes
| str r3, [r0, #12] ; potentially unaligned store of 4 bytes
| beq L1
|
| L0
| add lr, lr, #16 ; advance the output pointer by 16 bytes
| subs r4, r1, lr ; past the output?
| blt L3 ; break out of the loop
| strd r2, r3, [lr, #-16] ; aligned store of 16 bytes
| strd r2, r3, [lr, #-8]
| bne L0 ; goto beginning of loop
| L1
| pop {r4, pc}
|
| L2
| subs r4, r1, lr
| L3
| adds r4, r4, #16
| subs r1, r1, #8
| cmp r4, #4 ; between 4 and 15 bytes?
| blt L4
| cmp r4, #8 ; between 8 and 15 bytes?
| str r2, [lr, #-16] ; overlapping store of 4 + (4 + 4) + 4 bytes
| itt gt
| strgt r3, [lr, #-12]
| strgt r2, [r1]
| str r3, [r1, #4]
| pop {r4, pc}
|
| L4
| cmp r4, #2 ; 2 or 3 bytes?
| strb r2, [lr, #-16] ; store 1 byte
| it ge
| strhge r2, [r1, #6] ; store 2 bytes
| pop {r4, pc}
|
| END
|
|
