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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <arch/exception.h> |
29 | #include <arch/exception.h> |
30 | #include <panic.h> |
30 | #include <panic.h> |
31 | #include <arch/cp0.h> |
31 | #include <arch/cp0.h> |
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | #include <arch.h> |
33 | #include <arch.h> |
34 | 34 | ||
35 | void exception(void) |
35 | void exception(void) |
36 | { |
36 | { |
37 | int excno; |
37 | int excno; |
38 | __u32 epc; |
38 | __u32 epc; |
39 | pri_t pri; |
39 | pri_t pri; |
40 | 40 | ||
41 | pri = cpu_priority_high(); |
41 | pri = cpu_priority_high(); |
42 | epc = cp0_epc_read(); |
42 | epc = cp0_epc_read(); |
43 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
43 | cp0_status_write(cp0_status_read() & ~ cp0_status_exl_exception_bit); |
44 | 44 | ||
45 | if (the->thread) { |
45 | if (THREAD) { |
46 | the->thread->saved_pri = pri; |
46 | THREAD->saved_pri = pri; |
47 | the->thread->saved_epc = epc; |
47 | THREAD->saved_epc = epc; |
48 | } |
48 | } |
49 | /* decode exception number and process the exception */ |
49 | /* decode exception number and process the exception */ |
50 | switch(excno = (cp0_cause_read()>>2)&0x1f) { |
50 | switch(excno = (cp0_cause_read()>>2)&0x1f) { |
51 | case EXC_Int: interrupt(); break; |
51 | case EXC_Int: interrupt(); break; |
52 | case EXC_TLBL: |
52 | case EXC_TLBL: |
53 | case EXC_TLBS: tlb_invalid(); break; |
53 | case EXC_TLBS: tlb_invalid(); break; |
54 | default: panic(PANIC "unhandled exception %d\n", excno); break; |
54 | default: panic(PANIC "unhandled exception %d\n", excno); break; |
55 | } |
55 | } |
56 | 56 | ||
57 | if (the->thread) { |
57 | if (THREAD) { |
58 | pri = the->thread->saved_pri; |
58 | pri = THREAD->saved_pri; |
59 | epc = the->thread->saved_epc; |
59 | epc = THREAD->saved_epc; |
60 | } |
60 | } |
61 | 61 | ||
62 | cp0_epc_write(epc); |
62 | cp0_epc_write(epc); |
63 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
63 | cp0_status_write(cp0_status_read() | cp0_status_exl_exception_bit); |
64 | cpu_priority_restore(pri); |
64 | cpu_priority_restore(pri); |
65 | } |
65 | } |
66 | 66 |