scoutos / prex-0.9.0 / bsp / hal / x86 / 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 trap handler when a processor trap occurs.
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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 <hal.h> |
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37 | #include <exception.h> |
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38 | #include <task.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 const char *const trap_name[] = { |
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50 | "Divide error", /* 0 */ |
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51 | "Debug trap", /* 1 */ |
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52 | "NMI", /* 2 */ |
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53 | "Breakpoint", /* 3 */ |
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54 | "Overflow", /* 4 */ |
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55 | "Bounds check", /* 5 */ |
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56 | "Invalid opecode", /* 6 */ |
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57 | "Device not available", /* 7 */ |
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58 | "Double fault", /* 8 */ |
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59 | "Coprocessor overrun", /* 9 */ |
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60 | "Invalid TSS", /* 10 */ |
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61 | "Segment not present", /* 11 */ |
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62 | "Stack bounds", /* 12 */ |
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63 | "General Protection", /* 13 */ |
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64 | "Page fault", /* 14 */ |
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65 | "Reserved", /* 15 */ |
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66 | "Coprocessor error", /* 16 */ |
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67 | "Alignment check", /* 17 */ |
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68 | "Cache flush denied" /* 18 */ |
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69 | }; |
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70 | #define MAXTRAP (sizeof(trap_name) / sizeof(void *) - 1) |
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71 | #endif /* DEBUG */ |
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72 | |||
73 | /*
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74 | * Trap/exception mapping table.
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75 | * x86 trap code is translated to the architecture
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76 | * independent exception code.
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77 | */
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78 | static const int exception_map[] = { |
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79 | SIGFPE, /* 0: Divide error */
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80 | SIGTRAP, /* 1: Debug trap */
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81 | SIGILL, /* 2: NMI */
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82 | SIGTRAP, /* 3: Breakpoint */
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83 | SIGFPE, /* 4: Overflow */
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84 | SIGILL, /* 5: Bounds check */
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85 | SIGILL, /* 6: Invalid opecode */
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86 | SIGFPE, /* 7: Device not available */
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87 | SIGILL, /* 8: Double fault */
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88 | SIGFPE, /* 9: Coprocessor overrun */
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89 | SIGSEGV, /* 10: Invalid TSS */
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90 | SIGSEGV, /* 11: Segment not present */
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91 | SIGSEGV, /* 12: Stack bounds */
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92 | SIGILL, /* 13: General Protection fault */
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93 | SIGSEGV, /* 14: Page fault */
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94 | SIGILL, /* 15: Reserved */
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95 | SIGFPE, /* 16: Coprocessor error */
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96 | SIGILL, /* 17: Alignment check */
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97 | SIGILL, /* 18: Cache flush denied */
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98 | }; |
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99 | |||
100 | /*
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101 | * Trap handler
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102 | * Invoke the exception handler if it is needed.
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103 | */
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104 | void
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105 | trap_handler(struct cpu_regs *regs)
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106 | { |
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107 | u_long trap_no = regs->trap_no; |
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108 | |||
109 | if (trap_no > 18) |
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110 | panic("Unknown trap");
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111 | else if (trap_no == 2) |
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112 | panic("NMI");
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113 | |||
114 | /*
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115 | * Check whether this trap is kernel page fault caused
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116 | * by known routine to access user space like copyin().
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117 | * If so, we change the return address of this exception.
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118 | */
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119 | if (trap_no == 14 && regs->cs == KERNEL_CS && |
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120 | (regs->eip == (uint32_t)known_fault1 || |
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121 | regs->eip == (uint32_t)known_fault2 || |
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122 | regs->eip == (uint32_t)known_fault3)) { |
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123 | DPRINTF(("\n*** Detect Fault! address=%x task=%s ***\n",
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124 | get_cr2(), curtask->name)); |
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125 | regs->eip = (uint32_t)copy_fault; |
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126 | return;
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127 | } |
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128 | #ifdef DEBUG
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129 | printf("============================\n");
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130 | printf("Trap %x: %s\n", (u_int)trap_no, trap_name[trap_no]);
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131 | if (trap_no == 14) |
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132 | printf(" Fault address=%x\n", get_cr2());
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133 | printf("============================\n");
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134 | trap_dump(regs); |
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135 | if (regs->cs == KERNEL_CS) {
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136 | printf("Trap in kernel!\n");
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137 | interrupt_mask(0);
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138 | spl0(); |
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139 | } |
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140 | for (;;) ;
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141 | #endif
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142 | if (regs->cs == KERNEL_CS)
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143 | panic("Kernel exception");
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144 | |||
145 | exception_mark(exception_map[trap_no]); |
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146 | exception_deliver(); |
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147 | } |
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148 | |||
149 | #ifdef DEBUG
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150 | void
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151 | trap_dump(struct cpu_regs *r)
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152 | { |
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153 | uint32_t ss, esp, *fp; |
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154 | u_int i; |
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155 | int spl;
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156 | |||
157 | /* Get current spl */
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158 | spl = splhigh(); |
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159 | splx(spl); |
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160 | |||
161 | if (r->cs & 3) { |
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162 | ss = r->ss; |
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163 | esp = r->esp; |
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164 | } else {
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165 | ss = r->ds; |
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166 | esp = (uint32_t)r; |
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167 | } |
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168 | printf("Trap frame %08lx error %x\n", (long)r, r->err_code); |
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169 | printf(" eax %08x ebx %08x ecx %08x edx %08x esi %08x edi %08x\n",
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170 | r->eax, r->ebx, r->ecx, r->edx, r->esi, r->edi); |
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171 | printf(" eip %08x esp %08x ebp %08x eflags %08x\n",
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172 | r->eip, esp, r->ebp, r->eflags); |
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173 | printf(" cs %08x ss %08x ds %08x es %08x esp0 %08x\n",
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174 | r->cs, ss, r->ds, r->es, tss_get()); |
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175 | |||
176 | printf(" >> interrupt is %s\n", (spl == 0) ? "enabled" : "disabled"); |
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177 | |||
178 | printf(" >> task=%s\n", curtask->name);
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179 | |||
180 | if (r->cs == KERNEL_CS) {
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181 | printf("Stack trace:\n");
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182 | fp = (uint32_t *)r->ebp; |
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183 | for (i = 0; i < 8; i++) { |
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184 | if (user_area(fp))
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185 | break;
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186 | fp = (uint32_t *)(*fp); /* XXX: may cause fault */
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187 | if (!(*(fp + 1) && *fp)) |
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188 | break;
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189 | printf(" %08x\n", *(fp + 1)); |
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190 | } |
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191 | } |
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192 | } |
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193 | #endif /* !DEBUG */ |