Rev 326 | Rev 330 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | jermar | 1 | /* |
| 319 | jermar | 2 | * Copyright (C) 2003-2004 Jakub Jermar |
| 1 | jermar | 3 | * All rights reserved. |
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 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 |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 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 |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 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 |
||
| 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 |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | #include <arch/exception.h> |
||
| 195 | vana | 30 | #include <arch/interrupt.h> |
| 1 | jermar | 31 | #include <panic.h> |
| 32 | #include <arch/cp0.h> |
||
| 33 | #include <arch/types.h> |
||
| 34 | #include <arch.h> |
||
| 227 | jermar | 35 | #include <debug.h> |
| 1 | jermar | 36 | |
| 317 | palkovsky | 37 | void exception(struct exception_regdump *pstate) |
| 1 | jermar | 38 | { |
| 39 | int excno; |
||
| 123 | decky | 40 | __u32 epc_shift = 0; |
| 213 | jermar | 41 | |
| 227 | jermar | 42 | ASSERT(CPU != NULL); |
| 43 | |||
| 213 | jermar | 44 | /* |
| 45 | * NOTE ON OPERATION ORDERING |
||
| 46 | * |
||
| 317 | palkovsky | 47 | * On entry, cpu_priority_high() must be called before |
| 48 | * exception bit is cleared. |
||
| 213 | jermar | 49 | */ |
| 50 | |||
| 313 | palkovsky | 51 | cpu_priority_high(); |
| 52 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
||
| 53 | cp0_status_um_bit)); |
||
| 327 | palkovsky | 54 | |
| 326 | palkovsky | 55 | /* Save pstate so that the threads can access it */ |
| 327 | palkovsky | 56 | /* If THREAD->pstate is set, this is nested exception, |
| 57 | * do not rewrite it |
||
| 58 | */ |
||
| 59 | if (THREAD && !THREAD->pstate) |
||
| 326 | palkovsky | 60 | THREAD->pstate = pstate; |
| 1 | jermar | 61 | |
| 62 | /* decode exception number and process the exception */ |
||
| 123 | decky | 63 | switch (excno = (cp0_cause_read() >> 2) & 0x1f) { |
| 64 | case EXC_Int: |
||
| 65 | interrupt(); |
||
| 66 | break; |
||
| 1 | jermar | 67 | case EXC_TLBL: |
| 123 | decky | 68 | case EXC_TLBS: |
| 317 | palkovsky | 69 | tlb_invalid(pstate); |
| 123 | decky | 70 | break; |
| 327 | palkovsky | 71 | case EXC_CpU: |
| 72 | #ifdef FPU_LAZY |
||
| 73 | scheduler_fpu_lazy_request(); |
||
| 74 | #else |
||
| 75 | panic("unhandled Coprocessor Unusable Exception\n"); |
||
| 76 | #endif |
||
| 77 | break; |
||
| 123 | decky | 78 | case EXC_Mod: |
| 79 | panic("unhandled TLB Modification Exception\n"); |
||
| 80 | break; |
||
| 81 | case EXC_AdEL: |
||
| 82 | panic("unhandled Address Error Exception - load or instruction fetch\n"); |
||
| 83 | break; |
||
| 84 | case EXC_AdES: |
||
| 85 | panic("unhandled Address Error Exception - store\n"); |
||
| 86 | break; |
||
| 87 | case EXC_IBE: |
||
| 88 | panic("unhandled Bus Error Exception - fetch instruction\n"); |
||
| 89 | break; |
||
| 90 | case EXC_DBE: |
||
| 91 | panic("unhandled Bus Error Exception - data reference: load or store\n"); |
||
| 92 | break; |
||
| 93 | case EXC_Bp: |
||
| 94 | /* it is necessary to not re-execute BREAK instruction after returning from Exception handler |
||
| 95 | (see page 138 in R4000 Manual for more information) */ |
||
| 96 | epc_shift = 4; |
||
| 97 | break; |
||
| 98 | case EXC_RI: |
||
| 99 | panic("unhandled Reserved Instruction Exception\n"); |
||
| 100 | break; |
||
| 101 | case EXC_Ov: |
||
| 102 | panic("unhandled Arithmetic Overflow Exception\n"); |
||
| 103 | break; |
||
| 104 | case EXC_Tr: |
||
| 105 | panic("unhandled Trap Exception\n"); |
||
| 106 | break; |
||
| 107 | case EXC_VCEI: |
||
| 108 | panic("unhandled Virtual Coherency Exception - instruction\n"); |
||
| 109 | break; |
||
| 110 | case EXC_FPE: |
||
| 111 | panic("unhandled Floating-Point Exception\n"); |
||
| 112 | break; |
||
| 113 | case EXC_WATCH: |
||
| 114 | panic("unhandled reference to WatchHi/WatchLo address\n"); |
||
| 115 | break; |
||
| 116 | case EXC_VCED: |
||
| 117 | panic("unhandled Virtual Coherency Exception - data\n"); |
||
| 118 | break; |
||
| 119 | default: |
||
| 120 | panic("unhandled exception %d\n", excno); |
||
| 1 | jermar | 121 | } |
| 122 | |||
| 317 | palkovsky | 123 | pstate->epc += epc_shift; |
| 327 | palkovsky | 124 | /* Set to NULL, so that we can still support nested |
| 125 | * exceptions |
||
| 126 | * TODO: We should probably set EXL bit before this command, |
||
| 127 | * nesting. On the other hand, if some exception occurs between |
||
| 128 | * here and ERET, it won't set anything on the pstate anyway. |
||
| 129 | */ |
||
| 326 | palkovsky | 130 | if (THREAD) |
| 131 | THREAD->pstate = NULL; |
||
| 1 | jermar | 132 | } |