From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001 From: Yuval Adam <_@yuv.al> Date: Wed, 30 Aug 2017 08:25:59 +0000 Subject: Initial file dump from open source release --- arch/unicore32/lib/strncpy_from_user.S | 45 ++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 arch/unicore32/lib/strncpy_from_user.S (limited to 'arch/unicore32/lib/strncpy_from_user.S') diff --git a/arch/unicore32/lib/strncpy_from_user.S b/arch/unicore32/lib/strncpy_from_user.S new file mode 100644 index 00000000..ff6c304d --- /dev/null +++ b/arch/unicore32/lib/strncpy_from_user.S @@ -0,0 +1,45 @@ +/* + * linux/arch/unicore32/lib/strncpy_from_user.S + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * 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 +#include +#include + + .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: sub.a r2, r2, #1 + ldrusr r3, r1, 1, ns + bfs 2f + stb.w r3, [r0]+, #1 + cxor.a 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 + stb r3, [r0+], #0 @ null terminate + mov r0, #-EFAULT + mov pc, lr + .popsection + -- cgit v1.3.1