| /* 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 |
