83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
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/*
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* Copyright (c) 2011 Aeroflex Gaisler
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*
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* BSD license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <asm-leon/leon.h>
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#include <asm-leon/leonstack.h>
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#include <asm-leon/asmmacro.h>
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extern volatile unsigned int __window_overflow_rettseq[3];
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extern volatile unsigned int __window_overflow_slow1[2];
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static unsigned int installed = 0;
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static unsigned int save__window_overflow_rettseq[3];
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int
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install_winoverflow_hook (void (*func) (void))
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{
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if (installed)
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{
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return 0;
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}
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if (!installed)
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{
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/*
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a7 50 00 00 rd %wim, %l3
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ae 10 00 01 mov %g1, %l7
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83 34 e0 01 srl %l3, 1, %g1
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81 c4 40 00 jmp %l1
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81 cc 80 00 rett %l2 */
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save__window_overflow_rettseq[0] = __window_overflow_rettseq[0];
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save__window_overflow_rettseq[1] = __window_overflow_rettseq[1];
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save__window_overflow_rettseq[2] = __window_overflow_rettseq[2];
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/*29 10 00 31 sethi %hi(0x4000c400), %l4
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81 c5 22 48 jmp %l4 + 0x248
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01 00 00 00 nop */
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__window_overflow_rettseq[0] = ((((unsigned int) func) >> 10) & 0x3fffff) | 0x29000000; /* upper 22 */
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__window_overflow_rettseq[1] = ((((unsigned int) func)) & 0x03ff) | 0x81c52000; /* lower 10 */
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__window_overflow_rettseq[2] = 0x01000000; /* nop */
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sparc_leon23_icache_flush ();
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installed = 1;
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}
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return 0;
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}
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void
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uninstall_winoverflow_hook ()
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{
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if (installed)
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{
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__window_overflow_rettseq[0] = save__window_overflow_rettseq[0];
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__window_overflow_rettseq[1] = save__window_overflow_rettseq[1];
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__window_overflow_rettseq[2] = save__window_overflow_rettseq[2];
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sparc_leon23_icache_flush ();
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installed = 0;
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}
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}
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