[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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[406] | 26 | #include <hal_special.h> |
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[16] | 27 | #include <hal_exception.h> |
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| 28 | #include <thread.h> |
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| 29 | #include <printk.h> |
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[380] | 30 | #include <chdev.h> |
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[16] | 31 | #include <vmm.h> |
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| 32 | #include <errno.h> |
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| 33 | #include <scheduler.h> |
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| 34 | #include <core.h> |
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| 35 | #include <syscalls.h> |
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[440] | 36 | #include <shared_syscalls.h> |
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[16] | 37 | #include <remote_spinlock.h> |
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[406] | 38 | #include <hal_kentry.h> |
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[16] | 39 | |
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[380] | 40 | |
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[16] | 41 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 42 | // Extern global variables |
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| 43 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 44 | |
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[380] | 45 | extern chdev_directory_t chdev_dir; // allocated in the kernel_init.c file. |
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[16] | 46 | |
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| 47 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[381] | 48 | // This enum defines the global exception types after analysis by the exception handler. |
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| 49 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 50 | |
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| 51 | typedef enum |
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| 52 | { |
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| 53 | EXCP_NON_FATAL, |
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| 54 | EXCP_USER_ERROR, |
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| 55 | EXCP_KERNEL_PANIC, |
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| 56 | } |
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| 57 | exception_handling_type_t; |
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| 58 | |
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| 59 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[407] | 60 | // This enum defines the mask values for an MMU exception code reported by the mips32. |
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[381] | 61 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 62 | |
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| 63 | typedef enum |
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| 64 | { |
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[407] | 65 | MMU_WRITE_PT1_UNMAPPED = 0x0001, |
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| 66 | MMU_WRITE_PT2_UNMAPPED = 0x0002, |
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| 67 | MMU_WRITE_PRIVILEGE_VIOLATION = 0x0004, |
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| 68 | MMU_WRITE_ACCESS_VIOLATION = 0x0008, |
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| 69 | MMU_WRITE_UNDEFINED_XTN = 0x0020, |
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| 70 | MMU_WRITE_PT1_ILLEGAL_ACCESS = 0x0040, |
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| 71 | MMU_WRITE_PT2_ILLEGAL_ACCESS = 0x0080, |
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| 72 | MMU_WRITE_DATA_ILLEGAL_ACCESS = 0x0100, |
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| 73 | |
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| 74 | MMU_READ_PT1_UNMAPPED = 0x1001, |
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| 75 | MMU_READ_PT2_UNMAPPED = 0x1002, |
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| 76 | MMU_READ_PRIVILEGE_VIOLATION = 0x1004, |
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| 77 | MMU_READ_EXEC_VIOLATION = 0x1010, |
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| 78 | MMU_READ_UNDEFINED_XTN = 0x1020, |
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| 79 | MMU_READ_PT1_ILLEGAL_ACCESS = 0x1040, |
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| 80 | MMU_READ_PT2_ILLEGAL_ACCESS = 0x1080, |
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| 81 | MMU_READ_DATA_ILLEGAL_ACCESS = 0x1100, |
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[381] | 82 | } |
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| 83 | mmu_exception_subtype_t; |
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| 84 | |
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| 85 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[16] | 86 | // This enum defines the relevant values for XCODE field in mips32 CP0_CR register. |
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| 87 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 88 | |
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| 89 | typedef enum |
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| 90 | { |
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[296] | 91 | XCODE_ADEL = 0x4, // Illegal address for data load |
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| 92 | XCODE_ADES = 0x5, // Illegal address for data store |
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| 93 | XCODE_IBE = 0x6, // Instruction MMU exception (can be NON-FATAL) |
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| 94 | XCODE_DBE = 0x7, // Data MMU exception (can be NON-FATAL) |
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| 95 | XCODE_RI = 0xA, // Reserved instruction exception |
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| 96 | XCODE_CPU = 0xB, // Coprocessor unusable exception (can be NON-FATAl) |
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| 97 | XCODE_OVR = 0xC, // Arithmetic Overflow exception |
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[16] | 98 | } |
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| 99 | xcode_values_t; |
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| 100 | |
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[409] | 101 | ///////////////////////////////////////////// |
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| 102 | char * hal_mmu_exception_str( uint32_t code ) |
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[408] | 103 | { |
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| 104 | if ( code == MMU_WRITE_PT1_UNMAPPED ) return "WRITE_PT1_UNMAPPED"; |
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| 105 | else if( code == MMU_WRITE_PT2_UNMAPPED ) return "WRITE_PT2_UNMAPPED"; |
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| 106 | else if( code == MMU_WRITE_PRIVILEGE_VIOLATION ) return "WRITE_PRIVILEGE_VIOLATION"; |
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| 107 | else if( code == MMU_WRITE_ACCESS_VIOLATION ) return "WRITE_ACCESS_VIOLATION"; |
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| 108 | else if( code == MMU_WRITE_UNDEFINED_XTN ) return "WRITE_UNDEFINED_XTN"; |
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| 109 | else if( code == MMU_WRITE_PT1_ILLEGAL_ACCESS ) return "WRITE_PT1_ILLEGAL_ACCESS"; |
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| 110 | else if( code == MMU_WRITE_PT2_ILLEGAL_ACCESS ) return "WRITE_PT2_ILLEGAL_ACCESS"; |
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| 111 | else if( code == MMU_WRITE_DATA_ILLEGAL_ACCESS ) return "WRITE_DATA_ILLEGAL_ACCESS"; |
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| 112 | else if( code == MMU_READ_PT1_UNMAPPED ) return "READ_PT1_UNMAPPED"; |
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| 113 | else if( code == MMU_READ_PT2_UNMAPPED ) return "READ_PT2_UNMAPPED"; |
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| 114 | else if( code == MMU_READ_PRIVILEGE_VIOLATION ) return "READ_PRIVILEGE_VIOLATION"; |
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| 115 | else if( code == MMU_READ_EXEC_VIOLATION ) return "READ_EXEC_VIOLATION"; |
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| 116 | else if( code == MMU_READ_UNDEFINED_XTN ) return "READ_UNDEFINED_XTN"; |
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| 117 | else if( code == MMU_READ_PT1_ILLEGAL_ACCESS ) return "READ_PT1_ILLEGAL_ACCESS"; |
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| 118 | else if( code == MMU_READ_PT2_ILLEGAL_ACCESS ) return "READ_PT2_ILLEGAL_ACCESS"; |
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| 119 | else if( code == MMU_READ_DATA_ILLEGAL_ACCESS ) return "READ_DATA_ILLEGAL_ACCESS"; |
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| 120 | else return "undefined"; |
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| 121 | } |
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| 122 | |
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[380] | 123 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 124 | // This function is called when a FPU Coprocessor Unavailable exception has been |
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[380] | 125 | // detected for the calling thread. |
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| 126 | // It enables the FPU, It saves the current FPU context in the current owner thread |
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| 127 | // descriptor if required, and restore the FPU context from the calling thread descriptor. |
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| 128 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 129 | // @ this : pointer on faulty thread descriptor. |
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| 130 | // @ return always EXCP_NON_FATAL |
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| 131 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 132 | error_t hal_fpu_exception( thread_t * this ) |
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[380] | 133 | { |
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| 134 | core_t * core = this->core; |
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| 135 | |
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| 136 | // enable FPU |
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| 137 | hal_fpu_enable(); |
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| 138 | |
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| 139 | // save FPU context in current owner thread if required |
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| 140 | if( core->fpu_owner != NULL ) |
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| 141 | { |
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| 142 | if( core->fpu_owner != this ) |
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| 143 | { |
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[408] | 144 | hal_fpu_context_save( XPTR( local_cxy , core->fpu_owner ) ); |
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[380] | 145 | } |
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| 146 | } |
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| 147 | |
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| 148 | // attach the FPU to the requesting thread |
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| 149 | hal_fpu_context_restore( this->fpu_context ); |
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| 150 | core->fpu_owner = this; |
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| 151 | |
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| 152 | return EXCP_NON_FATAL; |
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| 153 | |
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| 154 | } // end hal_fpu_exception() |
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| 155 | |
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| 156 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[437] | 157 | // This function is called when an MMU exception has been detected (IBE / DBE). |
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[380] | 158 | // It get the relevant exception arguments from the MMU. |
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| 159 | // It signal a fatal error in case of illegal access. In case of page unmapped |
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| 160 | // it checks that the faulty address belongs to a registered vseg. It update the local |
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| 161 | // vseg list from the reference cluster if required, and signal a fatal user error |
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| 162 | // in case of illegal virtual address. Finally, it updates the local page table from the |
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| 163 | // reference cluster. |
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| 164 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 165 | // @ this : pointer on faulty thread descriptor. |
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[440] | 166 | // @ excPC : |
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[406] | 167 | // @ is_ins : IBE if true / DBE if false. |
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[380] | 168 | // @ return EXCP_NON_FATAL / EXCP_USER_ERROR / EXCP_KERNEL_PANIC |
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| 169 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 170 | error_t hal_mmu_exception( thread_t * this, |
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[437] | 171 | uint32_t excPC, |
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[406] | 172 | bool_t is_ins ) |
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[380] | 173 | { |
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[406] | 174 | process_t * process; |
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| 175 | error_t error; |
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[380] | 176 | |
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[406] | 177 | uint32_t mmu_ins_excp_code; |
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| 178 | uint32_t mmu_ins_bad_vaddr; |
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| 179 | uint32_t mmu_dat_excp_code; |
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| 180 | uint32_t mmu_dat_bad_vaddr; |
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[380] | 181 | |
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[406] | 182 | uint32_t bad_vaddr; |
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[380] | 183 | uint32_t excp_code; |
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| 184 | |
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[406] | 185 | process = this->process; |
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[380] | 186 | |
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| 187 | // get relevant values from MMU |
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| 188 | hal_get_mmu_excp( &mmu_ins_excp_code, |
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| 189 | &mmu_ins_bad_vaddr, |
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| 190 | &mmu_dat_excp_code, |
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| 191 | &mmu_dat_bad_vaddr ); |
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| 192 | |
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[406] | 193 | // get exception code and faulty vaddr, depending on IBE/DBE |
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| 194 | if( is_ins ) |
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[380] | 195 | { |
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| 196 | excp_code = mmu_ins_excp_code; |
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| 197 | bad_vaddr = mmu_ins_bad_vaddr; |
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| 198 | } |
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[406] | 199 | else |
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[380] | 200 | { |
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| 201 | excp_code = mmu_dat_excp_code; |
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| 202 | bad_vaddr = mmu_dat_bad_vaddr; |
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| 203 | } |
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| 204 | |
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[438] | 205 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 206 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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[438] | 207 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[432] | 208 | printk("\n[DBG] %s : thread %x enter / is_ins %d / %s / vaddr %x / cycle %d\n", |
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| 209 | __FUNCTION__, this, is_ins, hal_mmu_exception_str(excp_code), bad_vaddr, cycle ); |
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| 210 | #endif |
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[408] | 211 | |
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[407] | 212 | // analyse exception code |
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| 213 | switch( excp_code ) |
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[380] | 214 | { |
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[407] | 215 | case MMU_WRITE_PT1_UNMAPPED: // non fatal |
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| 216 | case MMU_WRITE_PT2_UNMAPPED: |
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| 217 | case MMU_READ_PT1_UNMAPPED: |
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| 218 | case MMU_READ_PT2_UNMAPPED: |
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| 219 | { |
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| 220 | // try to map the unmapped PTE |
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| 221 | error = vmm_handle_page_fault( process, |
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[440] | 222 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT, // vpn |
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| 223 | false ); // not a COW |
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[407] | 224 | if( error ) |
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| 225 | { |
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| 226 | printk("\n[ERROR] in %s for thread %x : cannot map vaddr = %x\n", |
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| 227 | __FUNCTION__ , this->trdid , bad_vaddr ); |
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[406] | 228 | |
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[407] | 229 | return EXCP_USER_ERROR; |
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| 230 | } |
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| 231 | else // page fault successfull |
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| 232 | { |
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[391] | 233 | |
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[438] | 234 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 235 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 236 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[432] | 237 | printk("\n[DBG] %s : thread %x exit / page-fault handled for vaddr = %x\n", |
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| 238 | __FUNCTION__ , this , bad_vaddr ); |
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| 239 | #endif |
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[407] | 240 | |
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| 241 | return EXCP_NON_FATAL; |
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| 242 | } |
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| 243 | } |
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| 244 | case MMU_WRITE_PRIVILEGE_VIOLATION: // illegal access user error |
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| 245 | case MMU_READ_PRIVILEGE_VIOLATION: |
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[380] | 246 | { |
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[407] | 247 | printk("\n[ERROR] in %s for thread %x : illegal user access to vaddr = %x\n", |
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| 248 | __FUNCTION__ , this->trdid , bad_vaddr ); |
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[380] | 249 | |
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[407] | 250 | return EXCP_USER_ERROR; |
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| 251 | } |
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[408] | 252 | case MMU_WRITE_ACCESS_VIOLATION: // user error, or Copy-on-Write |
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[380] | 253 | { |
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[407] | 254 | // access page table to get GPT_COW flag |
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| 255 | bool_t cow = hal_gpt_pte_is_cow( &(process->vmm.gpt), |
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[408] | 256 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT ); |
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[380] | 257 | |
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[407] | 258 | if( cow ) // Copy-on-Write |
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| 259 | { |
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| 260 | // try to allocate and copy the page |
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[440] | 261 | error = vmm_handle_page_fault( process, |
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| 262 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT, // vpn |
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| 263 | true ); // COW |
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[407] | 264 | if( error ) |
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| 265 | { |
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| 266 | printk("\n[ERROR] in %s for thread %x : cannot cow vaddr = %x\n", |
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| 267 | __FUNCTION__ , this->trdid , bad_vaddr ); |
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[380] | 268 | |
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[407] | 269 | return EXCP_USER_ERROR; |
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| 270 | } |
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| 271 | else // Copy on write successfull |
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| 272 | { |
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[380] | 273 | |
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[438] | 274 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 275 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 276 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[432] | 277 | printk("\n[DBG] %s : thread %x exit / copy-on-write handled for vaddr = %x\n", |
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| 278 | __FUNCTION__ , this , bad_vaddr ); |
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| 279 | #endif |
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[380] | 280 | |
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[407] | 281 | return EXCP_NON_FATAL; |
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| 282 | } |
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| 283 | } |
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| 284 | else // non writable user error |
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| 285 | { |
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[409] | 286 | printk("\n[ERROR] in %s for thread %x : non-writable vaddr = %x\n", |
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[407] | 287 | __FUNCTION__ , this->trdid , bad_vaddr ); |
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| 288 | |
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| 289 | return EXCP_USER_ERROR; |
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| 290 | } |
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| 291 | } |
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| 292 | case MMU_READ_EXEC_VIOLATION: // user error |
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| 293 | { |
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| 294 | printk("\n[ERROR] in %s for thread %x : read to non-executable vaddr = %x\n", |
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| 295 | __FUNCTION__ , this->trdid , bad_vaddr ); |
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| 296 | |
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| 297 | return EXCP_USER_ERROR; |
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| 298 | } |
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| 299 | default: // this is a kernel error => panic |
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| 300 | { |
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[440] | 301 | assert( false , __FUNCTION__ , |
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| 302 | "thread %x / core[%x,%d] / epc %x / vaddr %x / cycle %d\n", |
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| 303 | this, local_cxy, this->core->lid, excPC, bad_vaddr, (uint32_t)hal_get_cycles() ); |
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[407] | 304 | |
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| 305 | return EXCP_KERNEL_PANIC; |
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| 306 | } |
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| 307 | } |
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[380] | 308 | } // end hal_mmu_exception() |
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| 309 | |
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| 310 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 311 | // This static function prints on the kernel terminal the saved context (core registers) |
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| 312 | // and the thread state of a faulty thread. |
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| 313 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 314 | // @ this : pointer on faulty thread descriptor. |
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[425] | 315 | // @ uzone : pointer on register array. |
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[407] | 316 | // @ error : EXCP_USER_ERROR or EXCP_KERNEL_PANIC |
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[380] | 317 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 318 | static void hal_exception_dump( thread_t * this, |
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[408] | 319 | reg_t * uzone, |
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[407] | 320 | error_t error ) |
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[380] | 321 | { |
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[408] | 322 | uint32_t save_sr; |
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| 323 | core_t * core = this->core; |
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| 324 | process_t * process = this->process; |
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[380] | 325 | |
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| 326 | // get pointers on TXT0 chdev |
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[407] | 327 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
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[380] | 328 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
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| 329 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
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| 330 | |
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| 331 | // get extended pointer on remote TXT0 chdev lock |
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| 332 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
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| 333 | |
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| 334 | // get TXT0 lock in busy waiting mode |
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| 335 | remote_spinlock_lock_busy( lock_xp , &save_sr ); |
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| 336 | |
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[407] | 337 | if( error == EXCP_USER_ERROR ) |
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| 338 | { |
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[408] | 339 | nolock_printk("\n=== USER ERROR / trdid %x / pid %x / core[%x,%d] / cycle %d ===\n", |
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| 340 | this->trdid, process->pid, local_cxy, core->lid , (uint32_t)hal_get_cycles() ); |
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[407] | 341 | } |
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[380] | 342 | else |
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[407] | 343 | { |
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[408] | 344 | nolock_printk("\n=== KERNEL PANIC / trdid %x / pid %x / core[%x,%d] / cycle %d ===\n", |
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| 345 | this->trdid, process->pid, local_cxy, core->lid , (uint32_t)hal_get_cycles() ); |
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[407] | 346 | } |
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[380] | 347 | |
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[408] | 348 | nolock_printk("local locks = %d / remote locks = %d / blocked_vector = %X\n\n", |
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| 349 | this->local_locks, this->remote_locks, this->blocked ); |
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[380] | 350 | |
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[408] | 351 | nolock_printk("c0_cr %X c0_epc %X c0_sr %X c0_th %X\n", |
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| 352 | uzone[UZ_CR], uzone[UZ_EPC], uzone[UZ_SR], uzone[UZ_TH] ); |
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[380] | 353 | |
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[408] | 354 | nolock_printk("c2_mode %X c2_ptpr %X\n", |
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| 355 | uzone[UZ_MODE], uzone[UZ_PTPR] ); |
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[380] | 356 | |
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[408] | 357 | nolock_printk("at_01 %X v0_2 %X v1_3 %X a0_4 %X a1_5 %X\n", |
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| 358 | uzone[UZ_AT], uzone[UZ_V0], uzone[UZ_V1], uzone[UZ_A0], uzone[UZ_A1] ); |
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| 359 | |
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| 360 | nolock_printk("a2_6 %X a3_7 %X t0_8 %X t1_9 %X t2_10 %X\n", |
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| 361 | uzone[UZ_A2], uzone[UZ_A3], uzone[UZ_T0], uzone[UZ_T1], uzone[UZ_T2] ); |
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[380] | 362 | |
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[408] | 363 | nolock_printk("t3_11 %X t4_12 %X t5_13 %X t6_14 %X t7_15 %X\n", |
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| 364 | uzone[UZ_T3], uzone[UZ_T4], uzone[UZ_T5], uzone[UZ_T6], uzone[UZ_T7] ); |
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[380] | 365 | |
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[408] | 366 | nolock_printk("s0_16 %X s1_17 %X s2_18 %X s3_19 %X s4_20 %X\n", |
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| 367 | uzone[UZ_S0], uzone[UZ_S1], uzone[UZ_S2], uzone[UZ_S3], uzone[UZ_S4] ); |
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[380] | 368 | |
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[408] | 369 | nolock_printk("s5_21 %X s6_22 %X s7_23 %X s8_24 %X ra_25 %X\n", |
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| 370 | uzone[UZ_S5], uzone[UZ_S6], uzone[UZ_S7], uzone[UZ_T8], uzone[UZ_T9] ); |
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[380] | 371 | |
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[408] | 372 | nolock_printk("gp_28 %X sp_29 %X S8_30 %X ra_31 %X\n", |
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| 373 | uzone[UZ_GP], uzone[UZ_SP], uzone[UZ_S8], uzone[UZ_RA] ); |
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[407] | 374 | |
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[380] | 375 | // release the lock |
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| 376 | remote_spinlock_unlock_busy( lock_xp , save_sr ); |
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| 377 | |
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| 378 | } // end hal_exception_dump() |
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| 379 | |
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[408] | 380 | /////////////////////// |
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| 381 | void hal_do_exception() |
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[16] | 382 | { |
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[408] | 383 | uint32_t * uzone; |
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| 384 | thread_t * this; |
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| 385 | error_t error; |
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| 386 | uint32_t excCode; // 4 bits XCODE from CP0_CR |
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[437] | 387 | uint32_t excPC; // fauty instruction address |
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[16] | 388 | |
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[408] | 389 | // get pointer on faulty thread uzone |
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| 390 | this = CURRENT_THREAD; |
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[425] | 391 | uzone = (uint32_t *)CURRENT_THREAD->uzone_current; |
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[408] | 392 | |
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[437] | 393 | // get XCODE and EPC from UZONE |
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[408] | 394 | excCode = (uzone[UZ_CR] >> 2) & 0xF; |
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[437] | 395 | excPC = uzone[UZ_EPC]; |
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[16] | 396 | |
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[438] | 397 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 398 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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[438] | 399 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[437] | 400 | printk("\n[DBG] %s : thread %x enter / core[%x,%d] / pid %x / epc %x / xcode %x / cycle %d\n", |
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| 401 | __FUNCTION__, this, local_cxy, this->core->lid, this->process->pid, excPC, excCode, cycle ); |
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[432] | 402 | #endif |
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[406] | 403 | |
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[16] | 404 | switch(excCode) |
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| 405 | { |
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| 406 | case XCODE_DBE: // can be non fatal |
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[406] | 407 | { |
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[437] | 408 | error = hal_mmu_exception( this , excPC , false ); // data MMU exception |
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[406] | 409 | break; |
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| 410 | } |
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[380] | 411 | case XCODE_IBE: // can be non fatal |
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[16] | 412 | { |
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[437] | 413 | error = hal_mmu_exception( this , excPC , true ); // ins MMU exception |
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[406] | 414 | break; |
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[16] | 415 | } |
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| 416 | case XCODE_CPU: // can be non fatal |
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| 417 | { |
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[408] | 418 | if( ((uzone[UZ_CR] >> 28) & 0x3) == 1 ) // unavailable FPU |
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[16] | 419 | { |
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[380] | 420 | error = hal_fpu_exception( this ); |
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[16] | 421 | } |
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| 422 | else |
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| 423 | { |
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| 424 | error = EXCP_USER_ERROR; |
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| 425 | } |
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[406] | 426 | break; |
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[16] | 427 | } |
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[380] | 428 | case XCODE_OVR: // user fatal error |
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| 429 | case XCODE_RI: // user fatal error |
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| 430 | case XCODE_ADEL: // user fatal error |
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| 431 | case XCODE_ADES: // user fatal error |
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[16] | 432 | { |
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| 433 | error = EXCP_USER_ERROR; |
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[406] | 434 | break; |
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[16] | 435 | } |
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| 436 | default: |
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| 437 | { |
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[317] | 438 | error = EXCP_KERNEL_PANIC; |
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[16] | 439 | } |
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| 440 | } |
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| 441 | |
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| 442 | // analyse error code |
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[317] | 443 | if( error == EXCP_USER_ERROR ) // user error => kill user process |
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[16] | 444 | { |
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[408] | 445 | hal_exception_dump( this , uzone , error ); |
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[407] | 446 | |
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[440] | 447 | sys_exit( EXIT_FAILURE ); |
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[16] | 448 | } |
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| 449 | else if( error == EXCP_KERNEL_PANIC ) // kernel error => kernel panic |
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| 450 | { |
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[408] | 451 | hal_exception_dump( this , uzone , error ); |
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[425] | 452 | |
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| 453 | assert( false , __FUNCTION__ , "thread %x in process %x on core [%x,%d]", |
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[440] | 454 | this , this->process->pid , local_cxy , this->core->lid ); |
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[16] | 455 | } |
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[406] | 456 | |
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[438] | 457 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 458 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 459 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[437] | 460 | printk("\n[DBG] %s : thread %x exit / core[%x,%d] / pid %x / epc %x / xcode %x / cycle %d\n", |
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| 461 | __FUNCTION__, this, local_cxy, this->core->lid, this->process->pid, excPC, excCode, cycle ); |
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[432] | 462 | #endif |
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[406] | 463 | |
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[16] | 464 | } // end hal_do_exception() |
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| 465 | |
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| 466 | |
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