diff options
Diffstat (limited to 'arch/avr32/lib/clear_user.S')
| -rw-r--r-- | arch/avr32/lib/clear_user.S | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/arch/avr32/lib/clear_user.S b/arch/avr32/lib/clear_user.S new file mode 100644 index 000000000..d8991b6f8 --- /dev/null +++ b/arch/avr32/lib/clear_user.S @@ -0,0 +1,76 @@ +/* + * 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 |