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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/thread.h>
#include <rtems/score/percpu.h>
#ifndef RTEMS_SMP
void __attribute__((naked)) __aeabi_read_tp(void);
void __attribute__((naked)) __aeabi_read_tp(void)
{
__asm__ volatile (
"ldr r0, =_Per_CPU_Information\n"
"ldr r0, [r0, %[executingoff]]\n"
#if defined(__thumb__) && !defined(__thumb2__)
"add r0, %[threadidoff]\n"
"ldr r0, [r0]\n"
#else
"ldr r0, [r0, %[threadidoff]]\n"
#endif
"bx lr\n"
:
: [executingoff] "I" (offsetof(Per_CPU_Control, executing)),
[threadidoff] "I" (offsetof(Thread_Control, Registers.thread_id))
);
}
#endif /* RTEMS_SMP */
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