https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 92d21ac74a9e3c09b0b01c764e530657e4c85c49 authored by Linus Torvalds on 11 July 2016, 03:24:59 UTC
Linux 4.7-rc7
Linux 4.7-rc7
Tip revision: 92d21ac
strlen_user.S
/*
* 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, 1998, 1999, 2004 by Ralf Baechle
* Copyright (C) 1999 Silicon Graphics, Inc.
* Copyright (C) 2011 MIPS Technologies, Inc.
*/
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/regdef.h>
#define EX(insn,reg,addr,handler) \
9: insn reg, addr; \
.section __ex_table,"a"; \
PTR 9b, handler; \
.previous
/*
* Return the size of a string (including the ending 0)
*
* Return 0 for error
*/
.macro __BUILD_STRLEN_ASM func
LEAF(__strlen_\func\()_asm)
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a0
bnez v0, .Lfault\@
move v0, a0
.ifeqs "\func", "kernel"
1: EX(lbu, v1, (v0), .Lfault\@)
.else
1: EX(lbue, v1, (v0), .Lfault\@)
.endif
PTR_ADDIU v0, 1
bnez v1, 1b
PTR_SUBU v0, a0
jr ra
END(__strlen_\func\()_asm)
.Lfault\@: move v0, zero
jr ra
.endm
#ifndef CONFIG_EVA
/* Set aliases */
.global __strlen_user_asm
.set __strlen_user_asm, __strlen_kernel_asm
#endif
__BUILD_STRLEN_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
__BUILD_STRLEN_ASM user
.set pop
#endif