projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 7b64fef3 WD |
1 | /* |
| 2 | * Copyright (C) 2004-2006 Atmel Corporation | |
| 3 | * | |
| 4 | * See file CREDITS for list of people who contributed to this | |
| 5 | * project. | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License as | |
| 9 | * published by the Free Software Foundation; either version 2 of | |
| 10 | * the License, or (at your option) any later version. | |
| 11 | * | |
| 12 | * This program is distributed in the hope that it will be useful, | |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 15 | * GNU General Public License for more details. | |
| 16 | * | |
| 17 | * You should have received a copy of the GNU General Public License | |
| 18 | * along with this program; if not, write to the Free Software | |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
| 20 | * MA 02111-1307 USA | |
| 21 | */ | |
| 22 | ||
| 23 | /* | |
| 24 | * r12: void *b | |
| 25 | * r11: int c | |
| 26 | * r10: size_t len | |
| 27 | * | |
| 28 | * Returns b in r12 | |
| 29 | */ | |
| 30 | .text | |
| 31 | ||
| 32 | .global memset | |
| 33 | .type memset, @function | |
| 34 | .align 2 | |
| 35 | memset: | |
| 36 | mov r9, r12 | |
| 37 | mov r8, r12 | |
| 38 | or r11, r11, r11 << 8 | |
| 39 | andl r9, 3, COH | |
| 40 | brne 1f | |
| 41 | ||
| 42 | 2: or r11, r11, r11 << 16 | |
| 43 | sub r10, 4 | |
| 44 | brlt 5f | |
| 45 | ||
| 46 | /* Let's do some real work */ | |
| 47 | 4: st.w r8++, r11 | |
| 48 | sub r10, 4 | |
| 49 | brge 4b | |
| 50 | ||
| 51 | /* | |
| 52 | * When we get here, we've got less than 4 bytes to set. r10 | |
| 53 | * might be negative. | |
| 54 | */ | |
| 55 | 5: sub r10, -4 | |
| 56 | reteq r12 | |
| 57 | ||
| 58 | /* Fastpath ends here, exactly 32 bytes from memset */ | |
| 59 | ||
| 60 | /* Handle unaligned count or pointer */ | |
| 61 | bld r10, 1 | |
| 62 | brcc 6f | |
| 63 | st.b r8++, r11 | |
| 64 | st.b r8++, r11 | |
| 65 | bld r10, 0 | |
| 66 | retcc r12 | |
| 67 | 6: st.b r8++, r11 | |
| 68 | mov pc, lr | |
| 69 | ||
| 70 | /* Handle unaligned pointer */ | |
| 71 | 1: sub r10, 4 | |
| 72 | brlt 5b | |
| 73 | add r10, r9 | |
| 74 | lsl r9, 1 | |
| 75 | add pc, r9 | |
| 76 | st.b r8++, r11 | |
| 77 | st.b r8++, r11 | |
| 78 | st.b r8++, r11 | |
| 79 | rjmp 2b | |
| 80 | ||
| 81 | .size memset, . - memset |