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, 2004 by Ralf Baechle
7 * Copyright (c) 1999 Silicon Graphics, Inc.
10 #include <asm/asm-offsets.h>
11 #include <asm/export.h>
12 #include <asm/regdef.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 up to 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 .macro __BUILD_STRNLEN_ASM func
30 LEAF(__strnlen_\func\()_asm)
31 LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
35 FEXPORT(__strnlen_\func\()_nocheck_asm)
37 PTR_ADDU a1, a0 # stop pointer
39 #ifdef CONFIG_CPU_DADDI_WORKAROUNDS
43 beq v0, a1, 1f # limit reached?
44 .ifeqs "\func", "kernel"
45 EX(lb, t0, (v0), .Lfault\@)
47 EX(lbe, t0, (v0), .Lfault\@)
52 #ifndef CONFIG_CPU_DADDI_WORKAROUNDS
61 END(__strnlen_\func\()_asm)
70 .global __strnlen_user_asm
71 .global __strnlen_user_nocheck_asm
72 .set __strnlen_user_asm, __strnlen_kernel_asm
73 .set __strnlen_user_nocheck_asm, __strnlen_kernel_nocheck_asm
74 EXPORT_SYMBOL(__strnlen_user_asm)
75 EXPORT_SYMBOL(__strnlen_user_nocheck_asm)
78 __BUILD_STRNLEN_ASM kernel
79 EXPORT_SYMBOL(__strnlen_kernel_asm)
80 EXPORT_SYMBOL(__strnlen_kernel_nocheck_asm)
86 __BUILD_STRNLEN_ASM user
88 EXPORT_SYMBOL(__strnlen_user_asm)
89 EXPORT_SYMBOL(__strnlen_user_nocheck_asm)