root / prex-0.9.0 / bsp / hal / arm / arch / trap.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009, 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 abort handler when a processor detect abort.
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32 | */
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33 | |||
34 | #include <sys/signal.h> |
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35 | #include <kernel.h> |
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36 | #include <task.h> |
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37 | #include <hal.h> |
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38 | #include <exception.h> |
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39 | #include <cpu.h> |
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40 | #include <trap.h> |
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41 | #include <cpufunc.h> |
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42 | #include <context.h> |
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43 | #include <locore.h> |
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44 | |||
45 | #ifdef DEBUG
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46 | /*
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47 | * Trap name
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48 | */
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49 | static char *const trap_name[] = { |
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50 | "Undefined Instruction",
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51 | "Prefetch Abort",
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52 | "Data Abort"
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53 | }; |
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54 | #define MAXTRAP (sizeof(trap_name) / sizeof(void *) - 1) |
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55 | #endif /* !DEBUG */ |
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56 | |||
57 | /*
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58 | * abort/exception mapping table.
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59 | * ARM exception is translated to the architecture
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60 | * independent exception code.
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61 | */
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62 | static const int exception_map[] = { |
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63 | SIGILL, /* Undefined instruction */
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64 | SIGSEGV, /* Prefech abort */
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65 | SIGSEGV, /* Data abort */
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66 | }; |
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67 | |||
68 | /*
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69 | * Trap handler
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70 | * Invoke the exception handler if it is needed.
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71 | */
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72 | void
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73 | trap_handler(struct cpu_regs *regs)
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74 | { |
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75 | u_long trap_no = regs->r0; |
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76 | |||
77 | if ((regs->cpsr & PSR_MODE) == PSR_SVC_MODE &&
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78 | trap_no == TRAP_DATA_ABORT && |
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79 | (regs->pc - 4 == (uint32_t)known_fault1 ||
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80 | regs->pc - 4 == (uint32_t)known_fault2 ||
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81 | regs->pc - 4 == (uint32_t)known_fault3)) {
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82 | DPRINTF(("\n*** Detect Fault! address=%x task=%s ***\n",
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83 | get_faultaddress(), curtask->name)); |
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84 | regs->pc = (uint32_t)copy_fault; |
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85 | return;
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86 | } |
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87 | #ifdef DEBUG
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88 | printf("=============================\n");
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89 | printf("Trap %x: %s\n", (u_int)trap_no, trap_name[trap_no]);
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90 | if (trap_no == TRAP_DATA_ABORT)
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91 | printf(" Fault address=%x\n", get_faultaddress());
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92 | else if (trap_no == TRAP_PREFETCH_ABORT) |
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93 | printf(" Fault address=%x\n", regs->pc);
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94 | printf("=============================\n");
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95 | |||
96 | trap_dump(regs); |
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97 | for (;;) ;
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98 | #endif
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99 | if ((regs->cpsr & PSR_MODE) != PSR_USR_MODE)
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100 | panic("Kernel exception");
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101 | |||
102 | exception_mark(exception_map[trap_no]); |
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103 | exception_deliver(); |
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104 | } |
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105 | |||
106 | #ifdef DEBUG
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107 | void
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108 | trap_dump(struct cpu_regs *r)
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109 | { |
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110 | |||
111 | printf("Trap frame %x\n", r);
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112 | printf(" r0 %08x r1 %08x r2 %08x r3 %08x r4 %08x r5 %08x\n",
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113 | r->r0, r->r1, r->r2, r->r3, r->r4, r->r5); |
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114 | printf(" r6 %08x r7 %08x r8 %08x r9 %08x r10 %08x r11 %08x\n",
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115 | r->r6, r->r7, r->r8, r->r9, r->r10, r->r11); |
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116 | printf(" r12 %08x sp %08x lr %08x pc %08x cpsr %08x\n",
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117 | r->r12, r->sp, r->lr, r->pc, r->cpsr); |
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118 | |||
119 | printf(" >> interrupt is %s\n",
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120 | (r->cpsr & PSR_INT_MASK) ? "disabled" : "enabled"); |
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121 | |||
122 | printf(" >> task=%s\n", curtask->name);
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123 | } |
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124 | #endif /* !DEBUG */ |