| 1 | /*
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler
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| 3 | *
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| 4 | * BSD license:
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| 5 | *
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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| 7 | * of this software and associated documentation files (the "Software"), to deal
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| 8 | * in the Software without restriction, including without limitation the rights
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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| 10 | * copies of the Software, and to permit persons to whom the Software is
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| 11 | * furnished to do so, subject to the following conditions:
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| 12 | *
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| 13 | * The above copyright notice and this permission notice shall be included in
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| 14 | * all copies or substantial portions of the Software.
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| 15 | *
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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| 22 | * THE SOFTWARE.
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| 23 | */
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| 24 |
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| 25 |
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| 26 | #include <asm-leon/leon.h>
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| 27 | #include <asm-leon/leonstack.h>
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| 28 | #include <asm-leon/asmmacro.h>
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| 29 |
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| 30 | extern volatile unsigned int __window_overflow_rettseq[3];
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| 31 | extern volatile unsigned int __window_overflow_slow1[2];
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| 32 |
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| 33 | static unsigned int installed = 0;
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| 34 | static unsigned int save__window_overflow_rettseq[3];
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| 35 |
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| 36 | int
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| 37 | install_winoverflow_hook (void (*func) (void))
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| 38 | {
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| 39 | if (installed)
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| 40 | {
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| 41 | return 0;
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| 42 | }
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| 43 | if (!installed)
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| 44 | {
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| 45 | /*
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| 46 | a7 50 00 00 rd %wim, %l3
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| 47 | ae 10 00 01 mov %g1, %l7
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| 48 | 83 34 e0 01 srl %l3, 1, %g1
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| 49 |
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| 50 | 81 c4 40 00 jmp %l1
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| 51 | 81 cc 80 00 rett %l2 */
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| 52 | save__window_overflow_rettseq[0] = __window_overflow_rettseq[0];
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| 53 | save__window_overflow_rettseq[1] = __window_overflow_rettseq[1];
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| 54 | save__window_overflow_rettseq[2] = __window_overflow_rettseq[2];
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| 55 |
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| 56 | /*29 10 00 31 sethi %hi(0x4000c400), %l4
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| 57 | 81 c5 22 48 jmp %l4 + 0x248
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| 58 | 01 00 00 00 nop */
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| 59 |
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| 60 | __window_overflow_rettseq[0] = ((((unsigned int) func) >> 10) & 0x3fffff) | 0x29000000; /* upper 22 */
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| 61 | __window_overflow_rettseq[1] = ((((unsigned int) func)) & 0x03ff) | 0x81c52000; /* lower 10 */
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| 62 | __window_overflow_rettseq[2] = 0x01000000; /* nop */
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| 63 |
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| 64 | sparc_leon23_icache_flush ();
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| 65 | installed = 1;
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| 66 | }
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| 67 | return 0;
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| 68 | }
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| 69 |
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| 70 | void
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| 71 | uninstall_winoverflow_hook ()
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| 72 | {
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| 73 | if (installed)
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| 74 | {
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| 75 | __window_overflow_rettseq[0] = save__window_overflow_rettseq[0];
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| 76 | __window_overflow_rettseq[1] = save__window_overflow_rettseq[1];
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| 77 | __window_overflow_rettseq[2] = save__window_overflow_rettseq[2];
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| 78 |
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| 79 | sparc_leon23_icache_flush ();
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| 80 | installed = 0;
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| 81 | }
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| 82 | }
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