| /* |
| * 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 |