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Diffstat (limited to 'arch/arm26/lib/putuser.S')
| -rw-r--r-- | arch/arm26/lib/putuser.S | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/arm26/lib/putuser.S b/arch/arm26/lib/putuser.S new file mode 100644 index 0000000..87588cb --- /dev/null +++ b/arch/arm26/lib/putuser.S @@ -0,0 +1,109 @@ +/* + * linux/arch/arm26/lib/putuser.S + * + * Copyright (C) 2001 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. + * + * Idea from x86 version, (C) Copyright 1998 Linus Torvalds + * + * These functions have a non-standard call interface to make + * them more efficient, especially as they return an error + * value in addition to the "real" return value. + * + * __put_user_X + * + * Inputs: r0 contains the address + * r1, r2 contains the value + * Outputs: r0 is the error code + * lr corrupted + * + * No other registers must be altered. (see include/asm-arm/uaccess.h + * for specific ASM register usage). + * + * Note that ADDR_LIMIT is either 0 or 0xc0000000 + * Note also that it is intended that __put_user_bad is not global. + */ +#include <asm/asm_offsets.h> +#include <asm/thread_info.h> +#include <asm/errno.h> + + .global __put_user_1 +__put_user_1: + bic r2, sp, #0x1f00 + bic r2, r2, #0x00ff + str lr, [sp, #-4]! + ldr r2, [r2, #TI_ADDR_LIMIT] + sub r2, r2, #1 + cmp r0, r2 + bge __put_user_bad +1: cmp r0, #0x02000000 + strlsbt r1, [r0] + strgeb r1, [r0] + mov r0, #0 + ldmfd sp!, {pc}^ + + .global __put_user_2 +__put_user_2: + bic r2, sp, #0x1f00 + bic r2, r2, #0x00ff + str lr, [sp, #-4]! + ldr r2, [r2, #TI_ADDR_LIMIT] + sub r2, r2, #2 + cmp r0, r2 + bge __put_user_bad +2: cmp r0, #0x02000000 + strlsbt r1, [r0], #1 + strgeb r1, [r0], #1 + mov r1, r1, lsr #8 +3: strlsbt r1, [r0] + strgeb r1, [r0] + mov r0, #0 + ldmfd sp!, {pc}^ + + .global __put_user_4 +__put_user_4: + bic r2, sp, #0x1f00 + bic r2, r2, #0x00ff + str lr, [sp, #-4]! + ldr r2, [r2, #TI_ADDR_LIMIT] + sub r2, r2, #4 + cmp r0, r2 +4: bge __put_user_bad + cmp r0, #0x02000000 + strlst r1, [r0] + strge r1, [r0] + mov r0, #0 + ldmfd sp!, {pc}^ + + .global __put_user_8 +__put_user_8: + bic ip, sp, #0x1f00 + bic ip, ip, #0x00ff + str lr, [sp, #-4]! + ldr ip, [ip, #TI_ADDR_LIMIT] + sub ip, ip, #8 + cmp r0, ip + bge __put_user_bad + cmp r0, #0x02000000 +5: strlst r1, [r0], #4 +6: strlst r2, [r0] + strge r1, [r0], #4 + strge r2, [r0] + mov r0, #0 + ldmfd sp!, {pc}^ + +__put_user_bad: + mov r0, #-EFAULT + mov pc, lr + +.section __ex_table, "a" + .long 1b, __put_user_bad + .long 2b, __put_user_bad + .long 3b, __put_user_bad + .long 4b, __put_user_bad + .long 5b, __put_user_bad + .long 6b, __put_user_bad +.previous |
