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| /* SPDX-License-Identifier: GPL-2.0 */
| // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
| #include <linux/linkage.h>
|
| .macro GET_FRONT_BITS rx y
| #ifdef __cskyLE__
| lsri \rx, \y
| #else
| lsli \rx, \y
| #endif
| .endm
|
| .macro GET_AFTER_BITS rx y
| #ifdef __cskyLE__
| lsli \rx, \y
| #else
| lsri \rx, \y
| #endif
| .endm
|
| /* void *memcpy(void *dest, const void *src, size_t n); */
| ENTRY(memcpy)
| mov r7, r2
| cmplti r4, 4
| bt .L_copy_by_byte
| mov r6, r2
| andi r6, 3
| cmpnei r6, 0
| jbt .L_dest_not_aligned
| mov r6, r3
| andi r6, 3
| cmpnei r6, 0
| jbt .L_dest_aligned_but_src_not_aligned
| .L0:
| cmplti r4, 16
| jbt .L_aligned_and_len_less_16bytes
| subi sp, 8
| stw r8, (sp, 0)
| .L_aligned_and_len_larger_16bytes:
| ldw r1, (r3, 0)
| ldw r5, (r3, 4)
| ldw r8, (r3, 8)
| stw r1, (r7, 0)
| ldw r1, (r3, 12)
| stw r5, (r7, 4)
| stw r8, (r7, 8)
| stw r1, (r7, 12)
| subi r4, 16
| addi r3, 16
| addi r7, 16
| cmplti r4, 16
| jbf .L_aligned_and_len_larger_16bytes
| ldw r8, (sp, 0)
| addi sp, 8
| cmpnei r4, 0
| jbf .L_return
|
| .L_aligned_and_len_less_16bytes:
| cmplti r4, 4
| bt .L_copy_by_byte
| .L1:
| ldw r1, (r3, 0)
| stw r1, (r7, 0)
| subi r4, 4
| addi r3, 4
| addi r7, 4
| cmplti r4, 4
| jbf .L1
| br .L_copy_by_byte
|
| .L_return:
| rts
|
| .L_copy_by_byte: /* len less than 4 bytes */
| cmpnei r4, 0
| jbf .L_return
| .L4:
| ldb r1, (r3, 0)
| stb r1, (r7, 0)
| addi r3, 1
| addi r7, 1
| decne r4
| jbt .L4
| rts
|
| /*
| * If dest is not aligned, just copying some bytes makes the dest align.
| * Afther that, we judge whether the src is aligned.
| */
| .L_dest_not_aligned:
| mov r5, r3
| rsub r5, r5, r7
| abs r5, r5
| cmplt r5, r4
| bt .L_copy_by_byte
| mov r5, r7
| sub r5, r3
| cmphs r5, r4
| bf .L_copy_by_byte
| mov r5, r6
| .L5:
| ldb r1, (r3, 0) /* makes the dest align. */
| stb r1, (r7, 0)
| addi r5, 1
| subi r4, 1
| addi r3, 1
| addi r7, 1
| cmpnei r5, 4
| jbt .L5
| cmplti r4, 4
| jbt .L_copy_by_byte
| mov r6, r3 /* judge whether the src is aligned. */
| andi r6, 3
| cmpnei r6, 0
| jbf .L0
|
| /* Judge the number of misaligned, 1, 2, 3? */
| .L_dest_aligned_but_src_not_aligned:
| mov r5, r3
| rsub r5, r5, r7
| abs r5, r5
| cmplt r5, r4
| bt .L_copy_by_byte
| bclri r3, 0
| bclri r3, 1
| ldw r1, (r3, 0)
| addi r3, 4
| cmpnei r6, 2
| bf .L_dest_aligned_but_src_not_aligned_2bytes
| cmpnei r6, 3
| bf .L_dest_aligned_but_src_not_aligned_3bytes
|
| .L_dest_aligned_but_src_not_aligned_1byte:
| mov r5, r7
| sub r5, r3
| cmphs r5, r4
| bf .L_copy_by_byte
| cmplti r4, 16
| bf .L11
| .L10: /* If the len is less than 16 bytes */
| GET_FRONT_BITS r1 8
| mov r5, r1
| ldw r6, (r3, 0)
| mov r1, r6
| GET_AFTER_BITS r6 24
| or r5, r6
| stw r5, (r7, 0)
| subi r4, 4
| addi r3, 4
| addi r7, 4
| cmplti r4, 4
| bf .L10
| subi r3, 3
| br .L_copy_by_byte
| .L11:
| subi sp, 16
| stw r8, (sp, 0)
| stw r9, (sp, 4)
| stw r10, (sp, 8)
| stw r11, (sp, 12)
| .L12:
| ldw r5, (r3, 0)
| ldw r11, (r3, 4)
| ldw r8, (r3, 8)
| ldw r9, (r3, 12)
|
| GET_FRONT_BITS r1 8 /* little or big endian? */
| mov r10, r5
| GET_AFTER_BITS r5 24
| or r5, r1
|
| GET_FRONT_BITS r10 8
| mov r1, r11
| GET_AFTER_BITS r11 24
| or r11, r10
|
| GET_FRONT_BITS r1 8
| mov r10, r8
| GET_AFTER_BITS r8 24
| or r8, r1
|
| GET_FRONT_BITS r10 8
| mov r1, r9
| GET_AFTER_BITS r9 24
| or r9, r10
|
| stw r5, (r7, 0)
| stw r11, (r7, 4)
| stw r8, (r7, 8)
| stw r9, (r7, 12)
| subi r4, 16
| addi r3, 16
| addi r7, 16
| cmplti r4, 16
| jbf .L12
| ldw r8, (sp, 0)
| ldw r9, (sp, 4)
| ldw r10, (sp, 8)
| ldw r11, (sp, 12)
| addi sp , 16
| cmplti r4, 4
| bf .L10
| subi r3, 3
| br .L_copy_by_byte
|
| .L_dest_aligned_but_src_not_aligned_2bytes:
| cmplti r4, 16
| bf .L21
| .L20:
| GET_FRONT_BITS r1 16
| mov r5, r1
| ldw r6, (r3, 0)
| mov r1, r6
| GET_AFTER_BITS r6 16
| or r5, r6
| stw r5, (r7, 0)
| subi r4, 4
| addi r3, 4
| addi r7, 4
| cmplti r4, 4
| bf .L20
| subi r3, 2
| br .L_copy_by_byte
| rts
|
| .L21: /* n > 16 */
| subi sp, 16
| stw r8, (sp, 0)
| stw r9, (sp, 4)
| stw r10, (sp, 8)
| stw r11, (sp, 12)
|
| .L22:
| ldw r5, (r3, 0)
| ldw r11, (r3, 4)
| ldw r8, (r3, 8)
| ldw r9, (r3, 12)
|
| GET_FRONT_BITS r1 16
| mov r10, r5
| GET_AFTER_BITS r5 16
| or r5, r1
|
| GET_FRONT_BITS r10 16
| mov r1, r11
| GET_AFTER_BITS r11 16
| or r11, r10
|
| GET_FRONT_BITS r1 16
| mov r10, r8
| GET_AFTER_BITS r8 16
| or r8, r1
|
| GET_FRONT_BITS r10 16
| mov r1, r9
| GET_AFTER_BITS r9 16
| or r9, r10
|
| stw r5, (r7, 0)
| stw r11, (r7, 4)
| stw r8, (r7, 8)
| stw r9, (r7, 12)
| subi r4, 16
| addi r3, 16
| addi r7, 16
| cmplti r4, 16
| jbf .L22
| ldw r8, (sp, 0)
| ldw r9, (sp, 4)
| ldw r10, (sp, 8)
| ldw r11, (sp, 12)
| addi sp, 16
| cmplti r4, 4
| bf .L20
| subi r3, 2
| br .L_copy_by_byte
|
|
| .L_dest_aligned_but_src_not_aligned_3bytes:
| cmplti r4, 16
| bf .L31
| .L30:
| GET_FRONT_BITS r1 24
| mov r5, r1
| ldw r6, (r3, 0)
| mov r1, r6
| GET_AFTER_BITS r6 8
| or r5, r6
| stw r5, (r7, 0)
| subi r4, 4
| addi r3, 4
| addi r7, 4
| cmplti r4, 4
| bf .L30
| subi r3, 1
| br .L_copy_by_byte
| .L31:
| subi sp, 16
| stw r8, (sp, 0)
| stw r9, (sp, 4)
| stw r10, (sp, 8)
| stw r11, (sp, 12)
| .L32:
| ldw r5, (r3, 0)
| ldw r11, (r3, 4)
| ldw r8, (r3, 8)
| ldw r9, (r3, 12)
|
| GET_FRONT_BITS r1 24
| mov r10, r5
| GET_AFTER_BITS r5 8
| or r5, r1
|
| GET_FRONT_BITS r10 24
| mov r1, r11
| GET_AFTER_BITS r11 8
| or r11, r10
|
| GET_FRONT_BITS r1 24
| mov r10, r8
| GET_AFTER_BITS r8 8
| or r8, r1
|
| GET_FRONT_BITS r10 24
| mov r1, r9
| GET_AFTER_BITS r9 8
| or r9, r10
|
| stw r5, (r7, 0)
| stw r11, (r7, 4)
| stw r8, (r7, 8)
| stw r9, (r7, 12)
| subi r4, 16
| addi r3, 16
| addi r7, 16
| cmplti r4, 16
| jbf .L32
| ldw r8, (sp, 0)
| ldw r9, (sp, 4)
| ldw r10, (sp, 8)
| ldw r11, (sp, 12)
| addi sp, 16
| cmplti r4, 4
| bf .L30
| subi r3, 1
| br .L_copy_by_byte
|
|
