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83 lines
1.7 KiB
83 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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#include <linux/linkage.h> |
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#include "sysdep.h" |
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.weak memset |
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ENTRY(__memset) |
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ENTRY(memset) |
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/* Test if len less than 4 bytes. */ |
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mov r12, r0 |
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cmplti r2, 8 |
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bt .L_set_by_byte |
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andi r13, r0, 3 |
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movi r19, 4 |
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/* Test if dest is not 4 bytes aligned. */ |
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bnez r13, .L_dest_not_aligned |
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/* Hardware can handle unaligned access directly. */ |
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.L_dest_aligned: |
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zextb r3, r1 |
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lsli r1, 8 |
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or r1, r3 |
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lsli r3, r1, 16 |
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or r3, r1 |
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/* If dest is aligned, then copy. */ |
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zext r18, r2, 31, 4 |
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/* Test if len less than 16 bytes. */ |
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bez r18, .L_len_less_16bytes |
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LABLE_ALIGN |
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.L_len_larger_16bytes: |
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stw r3, (r0, 0) |
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stw r3, (r0, 4) |
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stw r3, (r0, 8) |
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stw r3, (r0, 12) |
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PRE_BNEZAD (r18) |
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addi r0, 16 |
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BNEZAD (r18, .L_len_larger_16bytes) |
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.L_len_less_16bytes: |
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zext r18, r2, 3, 2 |
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andi r2, 3 |
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bez r18, .L_set_by_byte |
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.L_len_less_16bytes_loop: |
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stw r3, (r0, 0) |
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PRE_BNEZAD (r18) |
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addi r0, 4 |
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BNEZAD (r18, .L_len_less_16bytes_loop) |
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/* Test if len less than 4 bytes. */ |
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.L_set_by_byte: |
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zext r18, r2, 2, 0 |
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bez r18, .L_return |
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.L_set_by_byte_loop: |
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stb r1, (r0, 0) |
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PRE_BNEZAD (r18) |
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addi r0, 1 |
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BNEZAD (r18, .L_set_by_byte_loop) |
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.L_return: |
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mov r0, r12 |
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rts |
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/* If dest is not aligned, just set some bytes makes the dest |
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align. */ |
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.L_dest_not_aligned: |
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sub r13, r19, r13 |
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sub r2, r13 |
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.L_dest_not_aligned_loop: |
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/* Makes the dest align. */ |
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stb r1, (r0, 0) |
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PRE_BNEZAD (r13) |
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addi r0, 1 |
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BNEZAD (r13, .L_dest_not_aligned_loop) |
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cmplti r2, 8 |
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bt .L_set_by_byte |
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/* Check whether the src is aligned. */ |
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jbr .L_dest_aligned |
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ENDPROC(memset) |
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ENDPROC(__memset)
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