/* * Copyright (C) 2004-2006 Atmel Corporation * * Based on linux/arch/arm/lib/memset.S * Copyright (C) 1995-2000 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * ASM optimised string functions */ #include <asm/asm.h> /* * r12: void *b * r11: int c * r10: size_t len * * Returns b in r12 */ .text .global memset .type memset, @function .align 5 memset: mov r9, r12 mov r8, r12 or r11, r11, r11 << 8 andl r9, 3, COH brne 1f 2: or r11, r11, r11 << 16 sub r10, 4 brlt 5f /* Let's do some real work */ 4: st.w r8++, r11 sub r10, 4 brge 4b /* * When we get here, we've got less than 4 bytes to set. r10 * might be negative. */ 5: sub r10, -4 reteq r12 /* Fastpath ends here, exactly 32 bytes from memset */ /* Handle unaligned count or pointer */ bld r10, 1 brcc 6f st.b r8++, r11 st.b r8++, r11 bld r10, 0 retcc r12 6: st.b r8++, r11 retal r12 /* Handle unaligned pointer */ 1: sub r10, 4 brlt 5b add r10, r9 lsl r9, 1 add pc, r9 st.b r8++, r11 st.b r8++, r11 st.b r8++, r11 rjmp 2b .size memset, . - memset |