| Haavard Skinnemoen | 5f97f7f | 2006-09-25 23:32:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2004-2006 Atmel Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | */ |
| 8 | #include <asm/page.h> |
| 9 | #include <asm/thread_info.h> |
| 10 | #include <asm/asm.h> |
| 11 | |
| 12 | .text |
| 13 | .align 1 |
| 14 | .global clear_user |
| 15 | .type clear_user, "function" |
| 16 | clear_user: |
| 17 | branch_if_kernel r8, __clear_user |
| 18 | ret_if_privileged r8, r12, r11, r11 |
| 19 | |
| 20 | .global __clear_user |
| 21 | .type __clear_user, "function" |
| 22 | __clear_user: |
| 23 | mov r9, r12 |
| 24 | mov r8, 0 |
| 25 | andl r9, 3, COH |
| 26 | brne 5f |
| 27 | |
| 28 | 1: sub r11, 4 |
| 29 | brlt 2f |
| 30 | |
| 31 | 10: st.w r12++, r8 |
| 32 | sub r11, 4 |
| 33 | brge 10b |
| 34 | |
| 35 | 2: sub r11, -4 |
| 36 | reteq 0 |
| 37 | |
| 38 | /* Unaligned count or address */ |
| 39 | bld r11, 1 |
| 40 | brcc 12f |
| 41 | 11: st.h r12++, r8 |
| 42 | sub r11, 2 |
| 43 | reteq 0 |
| 44 | 12: st.b r12++, r8 |
| 45 | retal 0 |
| 46 | |
| 47 | /* Unaligned address */ |
| 48 | 5: cp.w r11, 4 |
| 49 | brlt 2b |
| 50 | |
| 51 | lsl r9, 2 |
| 52 | add pc, pc, r9 |
| 53 | 13: st.b r12++, r8 |
| 54 | sub r11, 1 |
| 55 | 14: st.b r12++, r8 |
| 56 | sub r11, 1 |
| 57 | 15: st.b r12++, r8 |
| 58 | sub r11, 1 |
| 59 | rjmp 1b |
| 60 | |
| 61 | .size clear_user, . - clear_user |
| 62 | .size __clear_user, . - __clear_user |
| 63 | |
| 64 | .section .fixup, "ax" |
| 65 | .align 1 |
| 66 | 18: sub r11, -4 |
| 67 | 19: retal r11 |
| 68 | |
| 69 | .section __ex_table, "a" |
| 70 | .align 2 |
| 71 | .long 10b, 18b |
| 72 | .long 11b, 19b |
| 73 | .long 12b, 19b |
| 74 | .long 13b, 19b |
| 75 | .long 14b, 19b |
| 76 | .long 15b, 19b |