1 | /* |
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2 | * hal_exception.c - implementation of exception handler for TSAR-MIPS32. |
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3 | * |
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4 | * Author Alain Greiner (2016, 2017) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <hal_types.h> |
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25 | #include <hal_irqmask.h> |
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26 | #include <hal_exception.h> |
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27 | #include <thread.h> |
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28 | #include <printk.h> |
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29 | #include <vmm.h> |
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30 | #include <errno.h> |
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31 | #include <scheduler.h> |
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32 | #include <core.h> |
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33 | #include <signal.h> |
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34 | #include <syscalls.h> |
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35 | #include <do_exception.h> |
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36 | #include <remote_spinlock.h> |
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37 | #include <mips32_uzone.h> |
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38 | |
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39 | ////////////////////////////////////////////////////////////////////////////////////////// |
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40 | // Extern global variables |
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41 | ////////////////////////////////////////////////////////////////////////////////////////// |
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42 | |
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43 | extern remote_spinlock_t exception_lock; // allocated in the do_exception.c file. |
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44 | |
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45 | ////////////////////////////////////////////////////////////////////////////////////////// |
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46 | // This enum defines the relevant values for XCODE field in mips32 CP0_CR register. |
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47 | ////////////////////////////////////////////////////////////////////////////////////////// |
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48 | |
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49 | typedef enum |
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50 | { |
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51 | XCODE_ADEL = 4, // Illegal address for data load |
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52 | XCODE_ADES = 5, // Illegal address for data store |
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53 | XCODE_IBE = 6, // Instruction MMU exception (can be NON-FATAL) |
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54 | XCODE_DBE = 7, // Data MMU exception (can be NON-FATAL) |
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55 | XCODE_RI = 10, // Reserved instruction exception |
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56 | XCODE_CPU = 11, // Coprocessor unusable exception (can be NON-FATAl) |
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57 | XCODE_OVR = 12 // Arithmetic Overflow exception |
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58 | } |
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59 | xcode_values_t; |
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60 | |
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61 | /////////////////////////////////////// |
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62 | void hal_do_exception( thread_t * this, |
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63 | reg_t * regs_tbl ) |
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64 | { |
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65 | error_t error; |
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66 | uint32_t excCode; // 4 bits XCODE from CP0_CR |
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67 | |
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68 | // get 4 bits XCODE from CP0_CR register |
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69 | excCode = (regs_tbl[UZ_CR] >> 2) & 0xF; |
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70 | |
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71 | switch(excCode) |
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72 | { |
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73 | case XCODE_DBE: // can be non fatal |
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74 | case XCODE_IBE: // can be non fatal |
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75 | { |
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76 | // call generic excepton handler for a MMU exception |
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77 | error = do_exception( this , true ); |
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78 | } |
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79 | break; |
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80 | |
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81 | case XCODE_CPU: // can be non fatal |
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82 | { |
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83 | if( ((regs_tbl[UZ_CR] >> 28) & 0x3) == 1 ) // unavailable FPU |
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84 | { |
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85 | // call generic excepton handler for a FPU exception |
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86 | error = do_exception( this , false ); |
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87 | } |
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88 | else |
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89 | { |
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90 | printk("\n[ERROR] in thread %x / unsupported coprocessor type\n", |
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91 | this->trdid ); |
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92 | error = EXCP_USER_ERROR; |
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93 | } |
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94 | } |
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95 | break; |
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96 | |
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97 | case XCODE_OVR: // user fatal error |
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98 | { |
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99 | printk("\n[ERROR] in thread %x / arithmetic overflow\n", |
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100 | this->trdid ); |
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101 | error = EXCP_USER_ERROR; |
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102 | } |
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103 | break; |
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104 | |
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105 | case XCODE_RI: // user fatal error |
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106 | { |
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107 | printk("\n[ERROR] in thread %x / arithmetic overflow\n", |
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108 | this->trdid ); |
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109 | error = EXCP_USER_ERROR; |
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110 | } |
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111 | break; |
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112 | |
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113 | case XCODE_ADEL: // user fatal error |
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114 | |
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115 | case XCODE_ADES: |
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116 | { |
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117 | printk("\n[ERROR] in thread %x / illegal address\n", |
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118 | this->trdid ); |
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119 | error = EXCP_USER_ERROR; |
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120 | } |
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121 | break; |
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122 | |
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123 | default: |
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124 | { |
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125 | printk("\n[PANIC] in %s for thread %x / illegal XCODE value\n", |
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126 | __FUNCTION__ , this->trdid ); |
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127 | error = EXCP_USER_ERROR; |
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128 | } |
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129 | } |
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130 | |
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131 | // analyse error code |
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132 | if( error == EXCP_USER_ERROR ) // user error => kill the user process and return |
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133 | { |
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134 | hal_exception_dump( this , regs_tbl ); |
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135 | sys_kill( this->process->pid , SIGKILL ); |
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136 | } |
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137 | else if( error == EXCP_KERNEL_PANIC ) // kernel error => kernel panic |
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138 | { |
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139 | hal_exception_dump( this , regs_tbl ); |
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140 | hal_core_sleep(); |
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141 | } |
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142 | } // end hal_do_exception() |
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143 | |
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144 | ///////////////////////////////////////// |
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145 | void hal_exception_dump( thread_t * this, |
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146 | reg_t * regs_tbl ) |
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147 | { |
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148 | // take the exception_lock located in io_cluster |
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149 | remote_spinlock_lock( XPTR( LOCAL_CLUSTER->io_cxy , &exception_lock ) ); |
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150 | |
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151 | // dump core registers values |
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152 | |
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153 | printk("\n====================================================================\n"); |
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154 | printk(" thread %x / process %x / core %x / cycle %d\n", |
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155 | this->trdid , this->process->pid , this->core->gid , hal_time_stamp() ); |
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156 | |
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157 | printk(" - Processor State:\n"); |
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158 | |
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159 | printk(" CR: %x\tEPC: %x\tSR: %x\tSP: %x\n", |
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160 | regs_tbl[UZ_CR], regs_tbl[UZ_EPC], regs_tbl[UZ_SR], regs_tbl[UZ_SP]); |
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161 | |
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162 | printk(" at_1 %x\tv0_2 %x\t\tv1_3 %x\ta0_4 %x\ta1_5 %x\n", |
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163 | regs_tbl[UZ_AT], regs_tbl[UZ_V0], regs_tbl[UZ_V1], regs_tbl[UZ_A0], regs_tbl[UZ_A1]); |
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164 | |
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165 | printk(" a2_6 %x\t\ta3_7 %x\tt0_8 %x\tt1_9 %x\tt2_10 %x\n", |
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166 | regs_tbl[UZ_A2],regs_tbl[UZ_A3],regs_tbl[UZ_T0],regs_tbl[UZ_T1],regs_tbl[UZ_T2]); |
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167 | |
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168 | printk(" t3_11 %x\tt4_12 %x\t\tt5_13 %x\tt6_14 %x\tt7_15 %x\n", |
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169 | regs_tbl[UZ_T3],regs_tbl[UZ_T4],regs_tbl[UZ_T5],regs_tbl[UZ_T6],regs_tbl[UZ_T7]); |
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170 | |
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171 | printk(" t8_24 %x\t\tt9_25 %x\tgp_28 %x\tc0_hi %x\tc0_lo %x\n", |
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172 | regs_tbl[UZ_T8],regs_tbl[UZ_T9],regs_tbl[UZ_GP],regs_tbl[UZ_HI],regs_tbl[UZ_LO]); |
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173 | |
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174 | printk(" s0_16 %x\ts1_17 %x\ts2_18 %x\ts3_19 %x\ts4_20 %x\n", |
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175 | regs_tbl[UZ_S0],regs_tbl[UZ_S1],regs_tbl[UZ_S2],regs_tbl[UZ_S3],regs_tbl[UZ_S4]); |
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176 | |
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177 | printk(" s5_21 %x\ts6_22 %x\t\ts7_23 %x\ts8_30 %x\tra_31 %x\n\n", |
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178 | regs_tbl[UZ_S5],regs_tbl[UZ_S6],regs_tbl[UZ_S7],regs_tbl[UZ_S8],regs_tbl[UZ_RA]); |
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179 | |
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180 | printk(" - Thread State: %x\n" |
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181 | " type = %s / local_locks = %d / remote_locks = %d / blocked = %x\n", |
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182 | thread_type_str( this->type ), this->local_locks, this->remote_locks, |
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183 | this->blocked ); |
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184 | |
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185 | // release the exception_lock |
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186 | remote_spinlock_unlock( XPTR( LOCAL_CLUSTER->io_cxy , &exception_lock ) ); |
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187 | |
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188 | } // end hal_exception_dump() |
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189 | |
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