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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2011 embedded brains GmbH & Co. KG
*
* 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.
*/
#include <rtems.h>
#include <bsp/vectors.h>
int ppc_exc_alignment_handler(BSP_Exception_frame *frame, unsigned excNum)
{
unsigned opcode = *(unsigned *) frame->EXC_SRR0;
/* Do we have a dcbz instruction? */
if ((opcode & 0xffe007ff) == 0x7c0007ec) {
unsigned clsz = rtems_cache_get_data_line_size();
unsigned a = (opcode >> 16) & 0x1f;
unsigned b = (opcode >> 11) & 0x1f;
PPC_GPR_TYPE *regs = &frame->GPR0;
unsigned *current = (unsigned *)
(((a == 0 ? 0 : (unsigned) regs[a]) + (unsigned) regs[b]) & (clsz - 1));
unsigned *end = current + clsz / sizeof(*current);
while (current != end) {
*current = 0;
++current;
}
frame->EXC_SRR0 += 4;
return 0;
} else {
return -1;
}
}
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