2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (c) 1996, 1998, 1999 by Ralf Baechle
7 * Copyright (c) 1999 Silicon Graphics, Inc.
10 #include <asm/offset.h>
11 #include <asm/regdef.h>
12 #include <asm/sgidefs.h>
14 #define EX(insn,reg,addr,handler) \
16 .section __ex_table,"a"; \
21 * Return the size of a string including the ending NUL character upto a
22 * maximum of a1 or 0 in case of error.
24 * Note: for performance reasons we deliberately accept that a user may
25 * make strlen_user and strnlen_user access the first few KSEG0
26 * bytes. There's nothing secret there. On 64-bit accessing beyond
27 * the maximum is a tad hairier ...
29 LEAF(__strnlen_user_asm)
30 LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
34 FEXPORT(__strnlen_user_nocheck_asm)
36 PTR_ADDU a1, a0 # stop pointer
37 1: beq v0, a1, 1f # limit reached?
38 EX(lb, t0, (v0), fault)
43 END(__strnlen_user_asm)