From 5deb3317cb51ac52de922bb55f8492624018906d Mon Sep 17 00:00:00 2001 From: Roman Yeryomin Date: Thu, 13 Sep 2012 00:40:35 +0300 Subject: Add realtek target files Signed-off-by: Roman Yeryomin --- .../realtek/files/arch/rlx/lib/strncpy_user.S | 58 ++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 target/linux/realtek/files/arch/rlx/lib/strncpy_user.S (limited to 'target/linux/realtek/files/arch/rlx/lib/strncpy_user.S') diff --git a/target/linux/realtek/files/arch/rlx/lib/strncpy_user.S b/target/linux/realtek/files/arch/rlx/lib/strncpy_user.S new file mode 100644 index 000000000..0acc71977 --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/lib/strncpy_user.S @@ -0,0 +1,58 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 1996, 1999 by Ralf Baechle + */ +#include +#include +#include +#include + +#define EX(insn,reg,addr,handler) \ +9: insn reg, addr; \ + .section __ex_table,"a"; \ + PTR 9b, handler; \ + .previous + +/* + * Returns: -EFAULT if exception before terminator, N if the entire + * buffer filled, else strlen. + */ + +/* + * Ugly special case have to check: we might get passed a user space + * pointer which wraps into the kernel space. We don't deal with that. If + * it happens at most some bytes of the exceptions handlers will be copied. + */ + +LEAF(__strncpy_from_user_asm) + LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok? + and v0, a1 + bnez v0, .Lfault + +FEXPORT(__strncpy_from_user_nocheck_asm) + move v0, zero + move v1, a1 + .set noreorder +1: EX(lbu, t0, (v1), .Lfault) + PTR_ADDIU v1, 1 + beqz t0, 2f + sb t0, (a0) + PTR_ADDIU v0, 1 + bne v0, a2, 1b + PTR_ADDIU a0, 1 + .set reorder +2: PTR_ADDU t0, a1, v0 + xor t0, a1 + bltz t0, .Lfault + jr ra # return n + END(__strncpy_from_user_asm) + +.Lfault: li v0, -EFAULT + jr ra + + .section __ex_table,"a" + PTR 1b, .Lfault + .previous -- cgit v1.2.3