[16] | 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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