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# SPDX-License-Identifier: GPL-2.0-only
#
# Configuration for Switch device support
#

config NET_SWITCHDEV
	bool "Switch (and switch-ish) device support"
	depends on INET
	help
	  This module provides glue between core networking code and device
	  drivers in order to support hardware switch chips in very generic
	  meaning of the word "switch". This include devices supporting L2/L3 but
	  also various flow offloading chips, including switches embedded into
	  SR-IOV NICs.
Copyright © 1996 – 2026 Jason A. Donenfeld. All Rights Reverse Engineered.
.Class */ .highlight .vg { color: #D70 } /* Name.Variable.Global */ .highlight .vi { color: #33B } /* Name.Variable.Instance */ .highlight .vm { color: #369 } /* Name.Variable.Magic */ .highlight .il { color: #00D; font-weight: bold } /* Literal.Number.Integer.Long */ } 
/* Copyright (C) 1998-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Code contributed by Matthew Wilcox <willy@odie.barnet.ac.uk>

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

/* Thumb requires excessive IT insns here.  */
#define NO_THUMB
#include <sysdep.h>

/* size_t strlen(const char *S)
 * entry: r0 -> string
 * exit: r0 = len
 */

	.syntax unified
	.text

ENTRY(strlen)
	bic     r1, r0, $3              @ addr of word containing first byte
	ldr     r2, [r1], $4            @ get the first word
	ands    r3, r0, $3              @ how many bytes are duff?
	rsb     r0, r3, $0              @ get - that number into counter.
	beq     Laligned                @ skip into main check routine if no
					@ more
#ifdef __ARMEB__
	orr     r2, r2, $0xff000000     @ set this byte to non-zero
	subs    r3, r3, $1              @ any more to do?
	orrgt   r2, r2, $0x00ff0000     @ if so, set this byte
	subs    r3, r3, $1              @ more?
	orrgt   r2, r2, $0x0000ff00     @ then set.
#else
	orr     r2, r2, $0x000000ff     @ set this byte to non-zero
	subs    r3, r3, $1              @ any more to do?
	orrgt   r2, r2, $0x0000ff00     @ if so, set this byte
	subs    r3, r3, $1              @ more?
	orrgt   r2, r2, $0x00ff0000     @ then set.
#endif
Laligned:				@ here, we have a word in r2.  Does it
	tst     r2, $0x000000ff         @ contain any zeroes?
	tstne   r2, $0x0000ff00         @
	tstne   r2, $0x00ff0000         @
	tstne   r2, $0xff000000         @
	addne   r0, r0, $4              @ if not, the string is 4 bytes longer
	ldrne   r2, [r1], $4            @ and we continue to the next word
	bne     Laligned                @
Llastword:				@ drop through to here once we find a
#ifdef __ARMEB__
	tst     r2, $0xff000000         @ word that has a zero byte in it
	addne   r0, r0, $1              @
	tstne   r2, $0x00ff0000         @ and add up to 3 bytes on to it
	addne   r0, r0, $1              @
	tstne   r2, $0x0000ff00         @ (if first three all non-zero, 4th
	addne   r0, r0, $1              @  must be zero)
#else
	tst     r2, $0x000000ff         @ word that has a zero byte in it
	addne   r0, r0, $1              @
	tstne   r2, $0x0000ff00         @ and add up to 3 bytes on to it
	addne   r0, r0, $1              @
	tstne   r2, $0x00ff0000         @ (if first three all non-zero, 4th
	addne   r0, r0, $1              @  must be zero)
#endif
	DO_RET(lr)
END(strlen)
libc_hidden_builtin_def (strlen)