diff options
author | Anton Arapov <anton@redhat.com> | 2012-04-16 10:05:28 +0200 |
---|---|---|
committer | Anton Arapov <anton@redhat.com> | 2012-04-16 10:05:28 +0200 |
commit | b4b6116a13633898cf868f2f103c96a90c4c20f8 (patch) | |
tree | 93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/arm/lib/strncpy_from_user.S | |
parent | edd4be777c953e5faafc80d091d3084b4343f5d3 (diff) | |
download | kernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.tar.gz kernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.tar.xz kernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.zip |
fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/arm/lib/strncpy_from_user.S')
-rw-r--r-- | arch/arm/lib/strncpy_from_user.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/lib/strncpy_from_user.S b/arch/arm/lib/strncpy_from_user.S new file mode 100644 index 00000000000..f202d7bd164 --- /dev/null +++ b/arch/arm/lib/strncpy_from_user.S @@ -0,0 +1,43 @@ +/* + * linux/arch/arm/lib/strncpy_from_user.S + * + * Copyright (C) 1995-2000 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. + */ +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/errno.h> + + .text + .align 5 + +/* + * Copy a string from user space to kernel space. + * r0 = dst, r1 = src, r2 = byte length + * returns the number of characters copied (strlen of copied string), + * -EFAULT on exception, or "len" if we fill the whole buffer + */ +ENTRY(__strncpy_from_user) + mov ip, r1 +1: subs r2, r2, #1 + ldrusr r3, r1, 1, pl + bmi 2f + strb r3, [r0], #1 + teq r3, #0 + bne 1b + sub r1, r1, #1 @ take NUL character out of count +2: sub r0, r1, ip + mov pc, lr +ENDPROC(__strncpy_from_user) + + .pushsection .fixup,"ax" + .align 0 +9001: mov r3, #0 + strb r3, [r0, #0] @ null terminate + mov r0, #-EFAULT + mov pc, lr + .popsection + |