cpu/microblaze/microblaze-context-volatile-clobber.S

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  *  @file
0005  *
0006  *  @ingroup RTEMSScoreCPUMicroBlaze
0007  *
0008  *  @brief MicroBlaze context volatile clobber implementation
0009  */
0010
0011 /*
0012  * COPYRIGHT (C) 2021 On-Line Applications Research Corporation (OAR).
0013  *
0014  * Redistribution and use in source and binary forms, with or without
0015  * modification, are permitted provided that the following conditions
0016  * are met:
0017  * 1. Redistributions of source code must retain the above copyright
0018  *    notice, this list of conditions and the following disclaimer.
0019  * 2. Redistributions in binary form must reproduce the above copyright
0020  *    notice, this list of conditions and the following disclaimer in the
0021  *    documentation and/or other materials provided with the distribution.
0022  *
0023  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0024  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0026  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0027  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0028  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0029  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0030  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0031  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0032  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0033  * POSSIBILITY OF SUCH DAMAGE.
0034  */
0035
0036 #ifdef HAVE_CONFIG_H
0037   #include "config.h"
0038 #endif
0039
0040 #include <rtems/asm.h>
0041
0042 .text
0043 .align 4
0044
0045 PUBLIC(_CPU_Context_volatile_clobber)
0046
0047 SYM(_CPU_Context_volatile_clobber):
0048
0049 .macro clobber_register reg
0050     addi r5, r5, -1
0051     add \reg, r0, r5
0052 .endm
0053
0054     clobber_register r3
0055     clobber_register r4
0056     clobber_register r6
0057     clobber_register r7
0058     clobber_register r8
0059     clobber_register r9
0060     clobber_register r10
0061
0062     rtsd    r15, 8
0063     nop