forked from Imagelibrary/rtems
57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (c) 2011 embedded brains GmbH & Co. KG
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <rtems.h>
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#include <bsp/vectors.h>
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int ppc_exc_alignment_handler(BSP_Exception_frame *frame, unsigned excNum)
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{
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unsigned opcode = *(unsigned *) frame->EXC_SRR0;
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/* Do we have a dcbz instruction? */
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if ((opcode & 0xffe007ff) == 0x7c0007ec) {
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unsigned clsz = rtems_cache_get_data_line_size();
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unsigned a = (opcode >> 16) & 0x1f;
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unsigned b = (opcode >> 11) & 0x1f;
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PPC_GPR_TYPE *regs = &frame->GPR0;
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unsigned *current = (unsigned *)
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(((a == 0 ? 0 : (unsigned) regs[a]) + (unsigned) regs[b]) & (clsz - 1));
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unsigned *end = current + clsz / sizeof(*current);
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while (current != end) {
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*current = 0;
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++current;
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}
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frame->EXC_SRR0 += 4;
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return 0;
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} else {
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return -1;
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}
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}
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