| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * Copyright (c) 2008 ARM Ltd |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. The name of the company may not be used to endorse or promote |
| * products derived from this software without specific prior written |
| * permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * Android adaptation and tweak by Jim Huang <jserv@0xlab.org>. |
| */ |
| |
| #include <private/bionic_asm.h> |
| |
| .syntax unified |
| |
| ENTRY(strcpy) |
| pld [r1, #0] |
| eor r2, r0, r1 |
| mov ip, r0 |
| tst r2, #3 |
| bne 4f |
| tst r1, #3 |
| bne 3f |
| 5: |
| str r5, [sp, #-4]! |
| mov r5, #0x01 |
| orr r5, r5, r5, lsl #8 |
| orr r5, r5, r5, lsl #16 |
| |
| str r4, [sp, #-4]! |
| tst r1, #4 |
| ldr r3, [r1], #4 |
| beq 2f |
| sub r2, r3, r5 |
| bics r2, r2, r3 |
| tst r2, r5, lsl #7 |
| itt eq |
| streq r3, [ip], #4 |
| ldreq r3, [r1], #4 |
| bne 1f |
| /* Inner loop. We now know that r1 is 64-bit aligned, so we |
| can safely fetch up to two words. This allows us to avoid |
| load stalls. */ |
| .p2align 2 |
| 2: |
| pld [r1, #8] |
| ldr r4, [r1], #4 |
| sub r2, r3, r5 |
| bics r2, r2, r3 |
| tst r2, r5, lsl #7 |
| sub r2, r4, r5 |
| bne 1f |
| str r3, [ip], #4 |
| bics r2, r2, r4 |
| tst r2, r5, lsl #7 |
| itt eq |
| ldreq r3, [r1], #4 |
| streq r4, [ip], #4 |
| beq 2b |
| mov r3, r4 |
| 1: |
| #ifdef __ARMEB__ |
| rors r3, r3, #24 |
| #endif |
| strb r3, [ip], #1 |
| tst r3, #0xff |
| #ifdef __ARMEL__ |
| ror r3, r3, #8 |
| #endif |
| bne 1b |
| ldr r4, [sp], #4 |
| ldr r5, [sp], #4 |
| bx lr |
| |
| /* Strings have the same offset from word alignment, but it's |
| not zero. */ |
| 3: |
| tst r1, #1 |
| beq 1f |
| ldrb r2, [r1], #1 |
| strb r2, [ip], #1 |
| cmp r2, #0 |
| it eq |
| bxeq lr |
| 1: |
| tst r1, #2 |
| beq 5b |
| ldrh r2, [r1], #2 |
| #ifdef __ARMEB__ |
| tst r2, #0xff00 |
| iteet ne |
| strhne r2, [ip], #2 |
| lsreq r2, r2, #8 |
| strbeq r2, [ip] |
| tstne r2, #0xff |
| #else |
| tst r2, #0xff |
| itet ne |
| strhne r2, [ip], #2 |
| strbeq r2, [ip] |
| tstne r2, #0xff00 |
| #endif |
| bne 5b |
| bx lr |
| |
| /* src and dst do not have a common word-alignement. Fall back to |
| byte copying. */ |
| 4: |
| ldrb r2, [r1], #1 |
| strb r2, [ip], #1 |
| cmp r2, #0 |
| bne 4b |
| bx lr |
| END(strcpy) |
