/* * Copyright (c) 2015 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. */ /* modified 2016-06-22: * converted aeabi_memset to normal memset (save r0, different argument order) */ #if __ARM_ARCH_ISA_THUMB >= 2 .syntax unified .text .align 2 .thumb .thumb_func .global memset .type memset, %function memset: .cfi_startproc push {r0, r4, r5, r6} lsls r4, r0, #30 beq .L14 subs r4, r2, #1 cmp r2, #0 beq .L16 uxtb r5, r1 mov r3, r0 b .L4 .L6: subs r2, r4, #1 cbz r4, .L16 mov r4, r2 .L4: strb r5, [r3], #1 lsls r2, r3, #30 bne .L6 .L2: cmp r4, #3 bls .L11 uxtb r5, r1 orr r5, r5, r5, lsl #8 cmp r4, #15 orr r5, r5, r5, lsl #16 bls .L9 add r2, r3, #16 mov r6, r4 .L10: subs r6, r6, #16 cmp r6, #15 str r5, [r2, #-16] str r5, [r2, #-12] str r5, [r2, #-8] str r5, [r2, #-4] add r2, r2, #16 bhi .L10 sub r2, r4, #16 bic r2, r2, #15 and r4, r4, #15 adds r2, r2, #16 cmp r4, #3 add r3, r3, r2 bls .L11 .L9: mov r6, r3 mov r2, r4 .L12: subs r2, r2, #4 cmp r2, #3 str r5, [r6], #4 bhi .L12 subs r2, r4, #4 bic r2, r2, #3 adds r2, r2, #4 add r3, r3, r2 and r4, r4, #3 .L11: cbz r4, .L16 uxtb r1, r1 add r4, r4, r3 .L13: strb r1, [r3], #1 cmp r3, r4 bne .L13 .L16: pop {r0, r4, r5, r6} bx lr .L14: mov r4, r2 mov r3, r0 b .L2 .cfi_endproc .size memset, . - memset #endif