tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
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
4 * for more details.
5 *
6 * Copyright (C) 1996, 1998, 1999, 2004 by Ralf Baechle
7 * Copyright (C) 1999 Silicon Graphics, Inc.
8 * Copyright (C) 2011 MIPS Technologies, Inc.
9 */
10#include <asm/asm.h>
11#include <asm/asm-offsets.h>
12#include <asm/regdef.h>
13
14#define EX(insn,reg,addr,handler) \
159: insn reg, addr; \
16 .section __ex_table,"a"; \
17 PTR 9b, handler; \
18 .previous
19
20/*
21 * Return the size of a string (including the ending 0)
22 *
23 * Return 0 for error
24 */
25 .macro __BUILD_STRLEN_ASM func
26LEAF(__strlen_\func\()_asm)
27 LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
28 and v0, a0
29 bnez v0, .Lfault\@
30
31FEXPORT(__strlen_\func\()_nocheck_asm)
32 move v0, a0
33.ifeqs "\func", "kernel"
341: EX(lbu, v1, (v0), .Lfault\@)
35.else
361: EX(lbue, v1, (v0), .Lfault\@)
37.endif
38 PTR_ADDIU v0, 1
39 bnez v1, 1b
40 PTR_SUBU v0, a0
41 jr ra
42 END(__strlen_\func\()_asm)
43
44.Lfault\@: move v0, zero
45 jr ra
46 .endm
47
48#ifndef CONFIG_EVA
49 /* Set aliases */
50 .global __strlen_user_asm
51 .global __strlen_user_nocheck_asm
52 .set __strlen_user_asm, __strlen_kernel_asm
53 .set __strlen_user_nocheck_asm, __strlen_kernel_nocheck_asm
54#endif
55
56__BUILD_STRLEN_ASM kernel
57
58#ifdef CONFIG_EVA
59
60 .set push
61 .set eva
62__BUILD_STRLEN_ASM user
63 .set pop
64#endif