| Jim Huang | 73c04b3 | 2010-08-10 17:23:39 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * Copyright (c) 2008 ARM Ltd |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. The name of the company may not be used to endorse or promote |
| 15 | * products derived from this software without specific prior written |
| 16 | * permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 19 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 22 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED |
| 23 | * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 24 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 25 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 26 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 27 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * |
| 29 | * Android adaptation and tweak by Jim Huang <jserv@0xlab.org>. |
| 30 | */ |
| 31 | |
| 32 | #include <machine/cpu-features.h> |
| Kenny Root | 420878c | 2011-02-16 11:55:58 -0800 | [diff] [blame] | 33 | #include <machine/asm.h> |
| Jim Huang | 73c04b3 | 2010-08-10 17:23:39 +0800 | [diff] [blame] | 34 | |
| Kenny Root | 420878c | 2011-02-16 11:55:58 -0800 | [diff] [blame] | 35 | ENTRY(strcpy) |
| Elliott Hughes | c54ca40 | 2013-12-13 12:17:13 -0800 | [diff] [blame] | 36 | pld [r1, #0] |
| Jim Huang | 73c04b3 | 2010-08-10 17:23:39 +0800 | [diff] [blame] | 37 | eor r2, r0, r1 |
| 38 | mov ip, r0 |
| 39 | tst r2, #3 |
| 40 | bne 4f |
| 41 | tst r1, #3 |
| 42 | bne 3f |
| 43 | 5: |
| 44 | str r5, [sp, #-4]! |
| 45 | mov r5, #0x01 |
| 46 | orr r5, r5, r5, lsl #8 |
| 47 | orr r5, r5, r5, lsl #16 |
| 48 | |
| 49 | str r4, [sp, #-4]! |
| 50 | tst r1, #4 |
| 51 | ldr r3, [r1], #4 |
| 52 | beq 2f |
| 53 | sub r2, r3, r5 |
| 54 | bics r2, r2, r3 |
| 55 | tst r2, r5, lsl #7 |
| 56 | itt eq |
| 57 | streq r3, [ip], #4 |
| 58 | ldreq r3, [r1], #4 |
| 59 | bne 1f |
| 60 | /* Inner loop. We now know that r1 is 64-bit aligned, so we |
| 61 | can safely fetch up to two words. This allows us to avoid |
| 62 | load stalls. */ |
| 63 | .p2align 2 |
| 64 | 2: |
| Elliott Hughes | c54ca40 | 2013-12-13 12:17:13 -0800 | [diff] [blame] | 65 | pld [r1, #8] |
| Jim Huang | 73c04b3 | 2010-08-10 17:23:39 +0800 | [diff] [blame] | 66 | ldr r4, [r1], #4 |
| 67 | sub r2, r3, r5 |
| 68 | bics r2, r2, r3 |
| 69 | tst r2, r5, lsl #7 |
| 70 | sub r2, r4, r5 |
| 71 | bne 1f |
| 72 | str r3, [ip], #4 |
| 73 | bics r2, r2, r4 |
| 74 | tst r2, r5, lsl #7 |
| 75 | itt eq |
| 76 | ldreq r3, [r1], #4 |
| 77 | streq r4, [ip], #4 |
| 78 | beq 2b |
| 79 | mov r3, r4 |
| 80 | 1: |
| 81 | #ifdef __ARMEB__ |
| 82 | rors r3, r3, #24 |
| 83 | #endif |
| 84 | strb r3, [ip], #1 |
| 85 | tst r3, #0xff |
| 86 | #ifdef __ARMEL__ |
| 87 | ror r3, r3, #8 |
| 88 | #endif |
| 89 | bne 1b |
| 90 | ldr r4, [sp], #4 |
| 91 | ldr r5, [sp], #4 |
| 92 | bx lr |
| 93 | |
| 94 | /* Strings have the same offset from word alignment, but it's |
| 95 | not zero. */ |
| 96 | 3: |
| 97 | tst r1, #1 |
| 98 | beq 1f |
| 99 | ldrb r2, [r1], #1 |
| 100 | strb r2, [ip], #1 |
| 101 | cmp r2, #0 |
| 102 | it eq |
| 103 | bxeq lr |
| 104 | 1: |
| 105 | tst r1, #2 |
| 106 | beq 5b |
| 107 | ldrh r2, [r1], #2 |
| 108 | #ifdef __ARMEB__ |
| 109 | tst r2, #0xff00 |
| 110 | iteet ne |
| 111 | strneh r2, [ip], #2 |
| 112 | lsreq r2, r2, #8 |
| 113 | streqb r2, [ip] |
| 114 | tstne r2, #0xff |
| 115 | #else |
| 116 | tst r2, #0xff |
| 117 | itet ne |
| 118 | strneh r2, [ip], #2 |
| 119 | streqb r2, [ip] |
| 120 | tstne r2, #0xff00 |
| 121 | #endif |
| 122 | bne 5b |
| 123 | bx lr |
| 124 | |
| 125 | /* src and dst do not have a common word-alignement. Fall back to |
| 126 | byte copying. */ |
| 127 | 4: |
| 128 | ldrb r2, [r1], #1 |
| 129 | strb r2, [ip], #1 |
| 130 | cmp r2, #0 |
| 131 | bne 4b |
| 132 | bx lr |
| Kenny Root | 420878c | 2011-02-16 11:55:58 -0800 | [diff] [blame] | 133 | END(strcpy) |