scoutos / prex-0.9.0 / bsp / hal / ppc / arch / trap.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2009, Kohsuke Ohtani
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3 | * All rights reserved.
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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 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * trap.c - called from the trap handler when a processor trap occurs.
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32 | */
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33 | |||
34 | #include <kernel.h> |
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35 | #include <task.h> |
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36 | #include <hal.h> |
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37 | #include <exception.h> |
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38 | #include <cpu.h> |
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39 | #include <trap.h> |
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40 | #include <cpufunc.h> |
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41 | #include <context.h> |
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42 | #include <locore.h> |
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43 | |||
44 | #include <sys/signal.h> |
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45 | |||
46 | #ifdef DEBUG
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47 | /*
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48 | * Trap name.
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49 | */
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50 | static const char *const trap_name[] = { |
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51 | "", /* 0 */ |
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52 | "System reset", /* 1 */ |
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53 | "Machine check", /* 2 */ |
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54 | "DSI", /* 3 */ |
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55 | "ISI", /* 4 */ |
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56 | "External interrupt", /* 5 */ |
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57 | "Alignment", /* 6 */ |
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58 | "Program", /* 7 */ |
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59 | "Floating point unavailable", /* 8 */ |
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60 | "Decrementer", /* 9 */ |
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61 | "Reserved", /* a */ |
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62 | "Reserved", /* b */ |
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63 | "System call", /* c */ |
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64 | "Trace", /* d */ |
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65 | "Floating point assist", /* e */ |
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66 | }; |
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67 | #define MAXTRAP (sizeof(trap_name) / sizeof(void *) - 1) |
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68 | #endif /* DEBUG */ |
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69 | |||
70 | /*
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71 | * Exception mapping table.
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72 | * PPC exception is translated to the architecture
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73 | * independent exception code.
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74 | */
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75 | static const int exception_map[] = { |
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76 | SIGILL, |
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77 | SIGILL, |
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78 | SIGSEGV, /* machine check */
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79 | SIGSEGV, /* address error (store) */
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80 | SIGBUS, /* instruction bus error */
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81 | SIGINT, /* external interrupt */
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82 | SIGBUS, /* alingment */
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83 | SIGTRAP, /* breakpoint trap */
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84 | SIGFPE, /* fpu unavail */
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85 | SIGALRM, /* decrementer */
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86 | SIGILL, /* reserved */
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87 | SIGILL, /* reserved */
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88 | SIGCHLD, /* syscall */
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89 | SIGTRAP, /* debug trap */
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90 | SIGFPE, /* fp assist */
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91 | }; |
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92 | |||
93 | /*
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94 | * Trap handler
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95 | * Invoke the exception handler if it is needed.
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96 | */
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97 | void
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98 | trap_handler(struct cpu_regs *regs)
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99 | { |
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100 | uint32_t trap_no = regs->trap_no; |
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101 | |||
102 | #ifdef DEBUG
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103 | printf("============================\n");
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104 | printf("Trap %x: %s\n", trap_no, trap_name[trap_no]);
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105 | printf("============================\n");
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106 | |||
107 | trap_dump(regs); |
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108 | for (;;) ;
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109 | #endif
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110 | if ((regs->srr1 & MSR_PR) != MSR_PR)
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111 | panic("Kernel exception");
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112 | |||
113 | exception_mark(exception_map[trap_no]); |
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114 | exception_deliver(); |
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115 | } |
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116 | |||
117 | #ifdef DEBUG
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118 | void
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119 | trap_dump(struct cpu_regs *r)
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120 | { |
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121 | |||
122 | printf("Trap frame %x\n", r);
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123 | printf(" r0 %08x r1 %08x r2 %08x r3 %08x r4 %08x r5 %08x\n",
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124 | r->gr[0], r->gr[1], r->gr[2], r->gr[3], r->gr[4], r->gr[5]); |
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125 | printf(" r6 %08x r7 %08x r8 %08x r9 %08x r10 %08x r11 %08x\n",
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126 | r->gr[6], r->gr[7], r->gr[8], r->gr[9], r->gr[10], r->gr[11]); |
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127 | printf(" r12 %08x r13 %08x r14 %08x r15 %08x r16 %08x r17 %08x\n",
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128 | r->gr[12], r->gr[13], r->gr[14], r->gr[15], r->gr[16], r->gr[17]); |
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129 | printf(" r18 %08x r19 %08x r20 %08x r21 %08x r22 %08x r23 %08x\n",
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130 | r->gr[18], r->gr[19], r->gr[20], r->gr[21], r->gr[22], r->gr[23]); |
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131 | printf(" r24 %08x r25 %08x r26 %08x r27 %08x r28 %08x r29 %08x\n",
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132 | r->gr[24], r->gr[25], r->gr[26], r->gr[27], r->gr[28], r->gr[29]); |
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133 | printf(" r30 %08x r31 %08x lr %08x cr %08x xer %08x ctr %08x\n",
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134 | r->gr[30], r->gr[31], r->lr, r->cr, r->xer, r->ctr); |
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135 | printf(" srr0 %08x srr1 %08x\n", r->srr0, r->srr1);
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136 | |||
137 | printf(" >> interrupt is %s\n",
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138 | (r->srr1 & MSR_EE) ? "enabled" : "disabled"); |
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139 | |||
140 | printf(" >> task=%s\n", curtask->name);
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141 | } |
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142 | #endif /* !DEBUG */ |