forked from Imagelibrary/rtems
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/*
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* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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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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