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