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- /*
- * Copyright 2004-2006 Atmel Corporation
- *
- * 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.
- */
- #include <asm/page.h>
- #include <asm/thread_info.h>
- #include <asm/asm.h>
- .text
- .align 1
- .global clear_user
- .type clear_user, "function"
- clear_user:
- branch_if_kernel r8, __clear_user
- ret_if_privileged r8, r12, r11, r11
- .global __clear_user
- .type __clear_user, "function"
- __clear_user:
- mov r9, r12
- mov r8, 0
- andl r9, 3, COH
- brne 5f
- 1: sub r11, 4
- brlt 2f
- 10: st.w r12++, r8
- sub r11, 4
- brge 10b
- 2: sub r11, -4
- reteq 0
- /* Unaligned count or address */
- bld r11, 1
- brcc 12f
- 11: st.h r12++, r8
- sub r11, 2
- reteq 0
- 12: st.b r12++, r8
- retal 0
- /* Unaligned address */
- 5: cp.w r11, 4
- brlt 2b
- lsl r9, 2
- add pc, pc, r9
- 13: st.b r12++, r8
- sub r11, 1
- 14: st.b r12++, r8
- sub r11, 1
- 15: st.b r12++, r8
- sub r11, 1
- rjmp 1b
- .size clear_user, . - clear_user
- .size __clear_user, . - __clear_user
- .section .fixup, "ax"
- .align 1
- 18: sub r11, -4
- 19: retal r11
- .section __ex_table, "a"
- .align 2
- .long 10b, 18b
- .long 11b, 19b
- .long 12b, 19b
- .long 13b, 19b
- .long 14b, 19b
- .long 15b, 19b
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