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: cbfe8fa6cd672011c755c3cd85c9ffd4e2d10a6f authored by Linus Torvalds on 26 July 2015, 19:26:21 UTC
Linux 4.2-rc4
Linux 4.2-rc4
Tip revision: cbfe8fa
strnlen_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.
*/
#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 NUL character up to a
* maximum of a1 or 0 in case of error.
*
* Note: for performance reasons we deliberately accept that a user may
* make strlen_user and strnlen_user access the first few KSEG0
* bytes. There's nothing secret there. On 64-bit accessing beyond
* the maximum is a tad hairier ...
*/
.macro __BUILD_STRNLEN_ASM func
LEAF(__strnlen_\func\()_asm)
LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
and v0, a0
bnez v0, .Lfault\@
FEXPORT(__strnlen_\func\()_nocheck_asm)
move v0, a0
PTR_ADDU a1, a0 # stop pointer
1:
#ifdef CONFIG_CPU_DADDI_WORKAROUNDS
.set noat
li AT, 1
#endif
beq v0, a1, 1f # limit reached?
.ifeqs "\func", "kernel"
EX(lb, t0, (v0), .Lfault\@)
.else
EX(lbe, t0, (v0), .Lfault\@)
.endif
.set noreorder
bnez t0, 1b
1:
#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
PTR_ADDIU v0, 1
#else
PTR_ADDU v0, AT
.set at
#endif
.set reorder
PTR_SUBU v0, a0
jr ra
END(__strnlen_\func\()_asm)
.Lfault\@:
move v0, zero
jr ra
.endm
#ifndef CONFIG_EVA
/* Set aliases */
.global __strnlen_user_asm
.global __strnlen_user_nocheck_asm
.set __strnlen_user_asm, __strnlen_kernel_asm
.set __strnlen_user_nocheck_asm, __strnlen_kernel_nocheck_asm
#endif
__BUILD_STRNLEN_ASM kernel
#ifdef CONFIG_EVA
.set push
.set eva
__BUILD_STRNLEN_ASM user
.set pop
#endif