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1 | jermar | 1 | /* |
319 | jermar | 2 | * Copyright (C) 2003-2004 Jakub Jermar |
1 | jermar | 3 | * All rights reserved. |
4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <arch/exception.h> |
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195 | vana | 30 | #include <arch/interrupt.h> |
1 | jermar | 31 | #include <panic.h> |
32 | #include <arch/cp0.h> |
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33 | #include <arch/types.h> |
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34 | #include <arch.h> |
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227 | jermar | 35 | #include <debug.h> |
391 | jermar | 36 | #include <proc/thread.h> |
590 | palkovsky | 37 | #include <symtab.h> |
38 | #include <print.h> |
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39 | #include <interrupt.h> |
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1 | jermar | 40 | |
590 | palkovsky | 41 | static char * exctable[] = { |
42 | "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store", |
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43 | "Address Error - load/instr. fetch", |
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44 | "Address Error - store", |
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45 | "Bus Error - fetch instruction", |
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46 | "Bus Error - data reference", |
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47 | "Syscall", |
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48 | "BreakPoint", |
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49 | "Reserved Instruction", |
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50 | "Coprocessor Unusable", |
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51 | "Arithmetic Overflow", |
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52 | "Trap", |
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53 | "Virtual Coherency - instruction", |
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54 | "Floating Point", |
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55 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
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56 | "WatchHi/WatchLo", /* 23 */ |
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57 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
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58 | "Virtual Coherency - data", |
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59 | }; |
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60 | |||
61 | static void print_regdump(struct exception_regdump *pstate) |
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62 | { |
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63 | char *pcsymbol = ""; |
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64 | char *rasymbol = ""; |
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65 | |||
66 | char *s = get_symtab_entry(pstate->epc); |
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67 | if (s) |
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68 | pcsymbol = s; |
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69 | s = get_symtab_entry(pstate->ra); |
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70 | if (s) |
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71 | rasymbol = s; |
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72 | |||
73 | printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol, |
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74 | pstate->ra,rasymbol); |
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75 | } |
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76 | |||
77 | static void unhandled_exception(int n, void *data) |
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78 | { |
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79 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
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80 | |||
81 | print_regdump(pstate); |
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82 | panic("unhandled exception %s\n", exctable[n]); |
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83 | } |
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84 | |||
85 | static void breakpoint_exception(int n, void *data) |
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86 | { |
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87 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
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88 | /* it is necessary to not re-execute BREAK instruction after |
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89 | returning from Exception handler |
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90 | (see page 138 in R4000 Manual for more information) */ |
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91 | pstate->epc += 4; |
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92 | } |
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93 | |||
94 | static void tlbmod_exception(int n, void *data) |
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95 | { |
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96 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
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97 | tlb_modified(pstate); |
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98 | } |
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99 | |||
100 | static void tlbinv_exception(int n, void *data) |
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101 | { |
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102 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
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103 | tlb_invalid(pstate); |
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104 | } |
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105 | |||
593 | palkovsky | 106 | static void cpuns_exception(int n, void *data) |
590 | palkovsky | 107 | { |
108 | if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id) |
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109 | scheduler_fpu_lazy_request(); |
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110 | else |
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111 | panic("unhandled Coprocessor Unusable Exception\n"); |
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112 | } |
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113 | |||
114 | static void interrupt_exception(int n, void *pstate) |
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115 | { |
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116 | __u32 cause; |
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117 | int i; |
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118 | |||
119 | /* decode interrupt number and process the interrupt */ |
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120 | cause = (cp0_cause_read() >> 8) &0xff; |
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121 | |||
122 | for (i = 0; i < 8; i++) |
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123 | if (cause & (1 << i)) |
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124 | exc_dispatch(i+INT_OFFSET, pstate); |
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125 | } |
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126 | |||
127 | |||
317 | palkovsky | 128 | void exception(struct exception_regdump *pstate) |
1 | jermar | 129 | { |
330 | palkovsky | 130 | int cause; |
1 | jermar | 131 | int excno; |
123 | decky | 132 | __u32 epc_shift = 0; |
213 | jermar | 133 | |
227 | jermar | 134 | ASSERT(CPU != NULL); |
135 | |||
213 | jermar | 136 | /* |
137 | * NOTE ON OPERATION ORDERING |
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138 | * |
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413 | jermar | 139 | * On entry, interrupts_disable() must be called before |
317 | palkovsky | 140 | * exception bit is cleared. |
213 | jermar | 141 | */ |
142 | |||
413 | jermar | 143 | interrupts_disable(); |
313 | palkovsky | 144 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
145 | cp0_status_um_bit)); |
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327 | palkovsky | 146 | |
326 | palkovsky | 147 | /* Save pstate so that the threads can access it */ |
327 | palkovsky | 148 | /* If THREAD->pstate is set, this is nested exception, |
149 | * do not rewrite it |
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150 | */ |
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151 | if (THREAD && !THREAD->pstate) |
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326 | palkovsky | 152 | THREAD->pstate = pstate; |
1 | jermar | 153 | |
330 | palkovsky | 154 | cause = cp0_cause_read(); |
155 | excno = cp0_cause_excno(cause); |
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590 | palkovsky | 156 | /* Dispatch exception */ |
157 | exc_dispatch(excno, pstate); |
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158 | |||
327 | palkovsky | 159 | /* Set to NULL, so that we can still support nested |
160 | * exceptions |
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161 | * TODO: We should probably set EXL bit before this command, |
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162 | * nesting. On the other hand, if some exception occurs between |
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163 | * here and ERET, it won't set anything on the pstate anyway. |
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164 | */ |
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326 | palkovsky | 165 | if (THREAD) |
166 | THREAD->pstate = NULL; |
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1 | jermar | 167 | } |
590 | palkovsky | 168 | |
169 | void exception_init(void) |
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170 | { |
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171 | int i; |
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172 | |||
173 | /* Clear exception table */ |
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174 | for (i=0;i < IVT_ITEMS; i++) |
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175 | exc_register(i, "undef", unhandled_exception); |
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176 | exc_register(EXC_Bp, "bkpoint", breakpoint_exception); |
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177 | exc_register(EXC_Mod, "tlb_mod", tlbmod_exception); |
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178 | exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception); |
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179 | exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception); |
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180 | exc_register(EXC_Int, "interrupt", interrupt_exception); |
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181 | #ifdef CONFIG_FPU_LAZY |
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593 | palkovsky | 182 | exc_register(EXC_CpU, "cpunus", cpuns_exception); |
590 | palkovsky | 183 | #endif |
184 | } |