[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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[457] | 24 | #include <hal_kernel_types.h> |
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[16] | 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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[570] | 37 | #include <remote_busylock.h> |
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[406] | 38 | #include <hal_kentry.h> |
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[505] | 39 | #include <hal_exception.h> |
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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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[407] | 48 | // This enum defines the mask values for an MMU exception code reported by the mips32. |
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[381] | 49 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 50 | |
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| 51 | typedef enum |
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| 52 | { |
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[407] | 53 | MMU_WRITE_PT1_UNMAPPED = 0x0001, |
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| 54 | MMU_WRITE_PT2_UNMAPPED = 0x0002, |
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| 55 | MMU_WRITE_PRIVILEGE_VIOLATION = 0x0004, |
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| 56 | MMU_WRITE_ACCESS_VIOLATION = 0x0008, |
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| 57 | MMU_WRITE_UNDEFINED_XTN = 0x0020, |
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| 58 | MMU_WRITE_PT1_ILLEGAL_ACCESS = 0x0040, |
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| 59 | MMU_WRITE_PT2_ILLEGAL_ACCESS = 0x0080, |
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| 60 | MMU_WRITE_DATA_ILLEGAL_ACCESS = 0x0100, |
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| 61 | |
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| 62 | MMU_READ_PT1_UNMAPPED = 0x1001, |
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| 63 | MMU_READ_PT2_UNMAPPED = 0x1002, |
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| 64 | MMU_READ_PRIVILEGE_VIOLATION = 0x1004, |
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| 65 | MMU_READ_EXEC_VIOLATION = 0x1010, |
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| 66 | MMU_READ_UNDEFINED_XTN = 0x1020, |
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| 67 | MMU_READ_PT1_ILLEGAL_ACCESS = 0x1040, |
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| 68 | MMU_READ_PT2_ILLEGAL_ACCESS = 0x1080, |
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| 69 | MMU_READ_DATA_ILLEGAL_ACCESS = 0x1100, |
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[381] | 70 | } |
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| 71 | mmu_exception_subtype_t; |
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| 72 | |
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| 73 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[16] | 74 | // This enum defines the relevant values for XCODE field in mips32 CP0_CR register. |
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| 75 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 76 | |
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| 77 | typedef enum |
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| 78 | { |
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[296] | 79 | XCODE_ADEL = 0x4, // Illegal address for data load |
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| 80 | XCODE_ADES = 0x5, // Illegal address for data store |
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| 81 | XCODE_IBE = 0x6, // Instruction MMU exception (can be NON-FATAL) |
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| 82 | XCODE_DBE = 0x7, // Data MMU exception (can be NON-FATAL) |
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| 83 | XCODE_RI = 0xA, // Reserved instruction exception |
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| 84 | XCODE_CPU = 0xB, // Coprocessor unusable exception (can be NON-FATAl) |
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| 85 | XCODE_OVR = 0xC, // Arithmetic Overflow exception |
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[16] | 86 | } |
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| 87 | xcode_values_t; |
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| 88 | |
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[409] | 89 | ///////////////////////////////////////////// |
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| 90 | char * hal_mmu_exception_str( uint32_t code ) |
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[408] | 91 | { |
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[527] | 92 | switch (code) { |
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| 93 | case (MMU_WRITE_PT1_UNMAPPED): return "WRITE_PT1_UNMAPPED"; |
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| 94 | case (MMU_WRITE_PT2_UNMAPPED): return "WRITE_PT2_UNMAPPED"; |
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| 95 | case (MMU_WRITE_PRIVILEGE_VIOLATION): return "WRITE_PRIVILEGE_VIOLATION"; |
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| 96 | case (MMU_WRITE_ACCESS_VIOLATION): return "WRITE_ACCESS_VIOLATION"; |
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| 97 | case (MMU_WRITE_UNDEFINED_XTN): return "WRITE_UNDEFINED_XTN"; |
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| 98 | case (MMU_WRITE_PT1_ILLEGAL_ACCESS): return "WRITE_PT1_ILLEGAL_ACCESS"; |
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| 99 | case (MMU_WRITE_PT2_ILLEGAL_ACCESS): return "WRITE_PT2_ILLEGAL_ACCESS"; |
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| 100 | case (MMU_WRITE_DATA_ILLEGAL_ACCESS): return "WRITE_DATA_ILLEGAL_ACCESS"; |
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| 101 | case (MMU_READ_PT1_UNMAPPED): return "READ_PT1_UNMAPPED"; |
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| 102 | case (MMU_READ_PT2_UNMAPPED): return "READ_PT2_UNMAPPED"; |
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| 103 | case (MMU_READ_PRIVILEGE_VIOLATION): return "READ_PRIVILEGE_VIOLATION"; |
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| 104 | case (MMU_READ_EXEC_VIOLATION): return "READ_EXEC_VIOLATION"; |
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| 105 | case (MMU_READ_UNDEFINED_XTN): return "READ_UNDEFINED_XTN"; |
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| 106 | case (MMU_READ_PT1_ILLEGAL_ACCESS): return "READ_PT1_ILLEGAL_ACCESS"; |
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| 107 | case (MMU_READ_PT2_ILLEGAL_ACCESS): return "READ_PT2_ILLEGAL_ACCESS"; |
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| 108 | case (MMU_READ_DATA_ILLEGAL_ACCESS): return "READ_DATA_ILLEGAL_ACCESS"; |
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| 109 | default: return "undefined"; |
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| 110 | } |
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[408] | 111 | } |
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| 112 | |
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[380] | 113 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 114 | // This function is called when a FPU Coprocessor Unavailable exception has been |
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[380] | 115 | // detected for the calling thread. |
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| 116 | // It enables the FPU, It saves the current FPU context in the current owner thread |
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| 117 | // descriptor if required, and restore the FPU context from the calling thread descriptor. |
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| 118 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 119 | // @ this : pointer on faulty thread descriptor. |
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| 120 | // @ return always EXCP_NON_FATAL |
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| 121 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 122 | error_t hal_fpu_exception( thread_t * this ) |
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[380] | 123 | { |
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| 124 | core_t * core = this->core; |
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| 125 | |
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[457] | 126 | // enable FPU (in core SR) |
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[380] | 127 | hal_fpu_enable(); |
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| 128 | |
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[457] | 129 | // save FPU register values in current owner thread if required |
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[380] | 130 | if( core->fpu_owner != NULL ) |
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| 131 | { |
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| 132 | if( core->fpu_owner != this ) |
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| 133 | { |
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[457] | 134 | // save the FPU registers to current owner thread context |
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[408] | 135 | hal_fpu_context_save( XPTR( local_cxy , core->fpu_owner ) ); |
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[457] | 136 | |
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| 137 | // restore FPU registers from requesting thread context |
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[469] | 138 | hal_fpu_context_restore( this ); |
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[457] | 139 | |
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| 140 | // attach the FPU to the requesting thread |
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| 141 | core->fpu_owner = this; |
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[380] | 142 | } |
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| 143 | } |
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[457] | 144 | else |
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| 145 | { |
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| 146 | // restore FPU registers from requesting thread context |
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[469] | 147 | hal_fpu_context_restore( this ); |
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[380] | 148 | |
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[457] | 149 | // attach the FPU to the requesting thread |
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| 150 | core->fpu_owner = this; |
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| 151 | } |
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[380] | 152 | |
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| 153 | return EXCP_NON_FATAL; |
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| 154 | |
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| 155 | } // end hal_fpu_exception() |
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| 156 | |
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| 157 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[437] | 158 | // This function is called when an MMU exception has been detected (IBE / DBE). |
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[380] | 159 | // It get the relevant exception arguments from the MMU. |
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| 160 | // It signal a fatal error in case of illegal access. In case of page unmapped |
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| 161 | // it checks that the faulty address belongs to a registered vseg. It update the local |
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| 162 | // vseg list from the reference cluster if required, and signal a fatal user error |
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| 163 | // in case of illegal virtual address. Finally, it updates the local page table from the |
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| 164 | // reference cluster. |
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| 165 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 166 | // @ this : pointer on faulty thread descriptor. |
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[440] | 167 | // @ excPC : |
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[406] | 168 | // @ is_ins : IBE if true / DBE if false. |
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[380] | 169 | // @ return EXCP_NON_FATAL / EXCP_USER_ERROR / EXCP_KERNEL_PANIC |
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| 170 | ////////////////////////////////////////////////////////////////////////////////////////// |
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[406] | 171 | error_t hal_mmu_exception( thread_t * this, |
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[437] | 172 | uint32_t excPC, |
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[406] | 173 | bool_t is_ins ) |
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[380] | 174 | { |
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[406] | 175 | process_t * process; |
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| 176 | error_t error; |
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[380] | 177 | |
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[406] | 178 | uint32_t mmu_ins_excp_code; |
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| 179 | uint32_t mmu_ins_bad_vaddr; |
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| 180 | uint32_t mmu_dat_excp_code; |
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| 181 | uint32_t mmu_dat_bad_vaddr; |
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[380] | 182 | |
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[406] | 183 | uint32_t bad_vaddr; |
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[380] | 184 | uint32_t excp_code; |
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| 185 | |
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[406] | 186 | process = this->process; |
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[380] | 187 | |
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| 188 | // get relevant values from MMU |
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| 189 | hal_get_mmu_excp( &mmu_ins_excp_code, |
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| 190 | &mmu_ins_bad_vaddr, |
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| 191 | &mmu_dat_excp_code, |
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| 192 | &mmu_dat_bad_vaddr ); |
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| 193 | |
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[406] | 194 | // get exception code and faulty vaddr, depending on IBE/DBE |
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| 195 | if( is_ins ) |
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[380] | 196 | { |
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| 197 | excp_code = mmu_ins_excp_code; |
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| 198 | bad_vaddr = mmu_ins_bad_vaddr; |
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| 199 | } |
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[406] | 200 | else |
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[380] | 201 | { |
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| 202 | excp_code = mmu_dat_excp_code; |
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| 203 | bad_vaddr = mmu_dat_bad_vaddr; |
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| 204 | } |
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| 205 | |
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[438] | 206 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 207 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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[438] | 208 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[587] | 209 | printk("\n[DBG] %s : thread[%x,%x] enter / is_ins %d / %s / vaddr %x / cycle %d\n", |
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| 210 | __FUNCTION__, process->pid, this->trdid, |
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[469] | 211 | is_ins, hal_mmu_exception_str(excp_code), bad_vaddr, cycle); |
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[432] | 212 | #endif |
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[408] | 213 | |
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[407] | 214 | // analyse exception code |
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| 215 | switch( excp_code ) |
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[380] | 216 | { |
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[407] | 217 | case MMU_WRITE_PT1_UNMAPPED: // non fatal |
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| 218 | case MMU_WRITE_PT2_UNMAPPED: |
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| 219 | case MMU_READ_PT1_UNMAPPED: |
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| 220 | case MMU_READ_PT2_UNMAPPED: |
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| 221 | { |
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| 222 | // try to map the unmapped PTE |
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| 223 | error = vmm_handle_page_fault( process, |
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[587] | 224 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT ); |
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[406] | 225 | |
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[587] | 226 | if( error == EXCP_NON_FATAL ) // page-fault successfully handled |
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[407] | 227 | { |
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[391] | 228 | |
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[438] | 229 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 230 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 231 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[587] | 232 | printk("\n[DBG] %s : thread[%x,%x] exit / page-fault handled for vaddr = %x\n", |
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| 233 | __FUNCTION__, process->pid, this->trdid, bad_vaddr ); |
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[432] | 234 | #endif |
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[407] | 235 | |
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| 236 | return EXCP_NON_FATAL; |
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| 237 | } |
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[587] | 238 | else if( error == EXCP_USER_ERROR ) // illegal vaddr |
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| 239 | { |
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| 240 | printk("\n[USER ERROR] in %s for thread %x in process %x\n" |
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| 241 | " illegal vaddr = %x / is_ins %d / epc %x\n", |
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| 242 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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| 243 | |
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| 244 | return EXCP_USER_ERROR; |
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| 245 | } |
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| 246 | else // error == EXCP_KERNEL_PANIC |
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| 247 | { |
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| 248 | printk("\n[KERNEL ERROR] in %s for thread %x in process %x\n" |
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| 249 | " no memory to map vaddr = %x / is_ins %d / epc %x\n", |
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| 250 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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| 251 | |
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| 252 | return EXCP_KERNEL_PANIC; |
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| 253 | } |
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[407] | 254 | } |
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| 255 | case MMU_WRITE_PRIVILEGE_VIOLATION: // illegal access user error |
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| 256 | case MMU_READ_PRIVILEGE_VIOLATION: |
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[380] | 257 | { |
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[587] | 258 | printk("\n[USER ERROR] in %s : thread %x in process %x\n" |
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[469] | 259 | " illegal user access to vaddr = %x / is_ins %d / epc %x\n", |
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| 260 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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[380] | 261 | |
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[407] | 262 | return EXCP_USER_ERROR; |
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| 263 | } |
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[408] | 264 | case MMU_WRITE_ACCESS_VIOLATION: // user error, or Copy-on-Write |
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[380] | 265 | { |
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[407] | 266 | // access page table to get GPT_COW flag |
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| 267 | bool_t cow = hal_gpt_pte_is_cow( &(process->vmm.gpt), |
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[408] | 268 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT ); |
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[380] | 269 | |
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[407] | 270 | if( cow ) // Copy-on-Write |
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| 271 | { |
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| 272 | // try to allocate and copy the page |
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[587] | 273 | error = vmm_handle_cow( process, |
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| 274 | bad_vaddr >> CONFIG_PPM_PAGE_SHIFT ); |
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[380] | 275 | |
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[587] | 276 | if( error == EXCP_NON_FATAL ) // Copy on write successfull |
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[407] | 277 | { |
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[380] | 278 | |
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[438] | 279 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 280 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 281 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[587] | 282 | printk("\n[DBG] %s : thread[%x,%x] exit / copy-on-write handled for vaddr = %x\n", |
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| 283 | __FUNCTION__, process->pid, this->trdid, bad_vaddr ); |
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[432] | 284 | #endif |
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[380] | 285 | |
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[407] | 286 | return EXCP_NON_FATAL; |
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| 287 | } |
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[587] | 288 | else if( error == EXCP_USER_ERROR ) // illegal user access |
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| 289 | { |
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| 290 | printk("\n[USER ERROR] in %s : thread %x in process %x\n" |
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| 291 | " cannot cow vaddr = %x / is_ins %d / epc %x\n", |
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| 292 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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| 293 | |
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| 294 | return EXCP_USER_ERROR; |
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| 295 | } |
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| 296 | else // error == EXCP_KERNEL_PANIC |
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| 297 | { |
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| 298 | printk("\n[KERNEL ERROR] in %s : thread %x in process %x\n" |
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| 299 | " no memoty to cow vaddr = %x / is_ins %d / epc %x\n", |
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| 300 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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| 301 | |
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| 302 | return EXCP_USER_ERROR; |
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| 303 | } |
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[407] | 304 | } |
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| 305 | else // non writable user error |
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| 306 | { |
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[587] | 307 | printk("\n[USER ERROR] in %s : thread %x in process %x\n" |
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[469] | 308 | " non-writable vaddr = %x / is_ins %d / epc %x\n", |
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| 309 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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[407] | 310 | |
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| 311 | return EXCP_USER_ERROR; |
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| 312 | } |
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| 313 | } |
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| 314 | case MMU_READ_EXEC_VIOLATION: // user error |
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| 315 | { |
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[587] | 316 | printk("\n[USER_ERROR] in %s : thread %x in process %x\n" |
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[469] | 317 | " non-executable vaddr = %x / is_ins %d / epc %x\n", |
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| 318 | __FUNCTION__, this->trdid, this->process->pid, bad_vaddr, is_ins, excPC ); |
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[407] | 319 | |
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| 320 | return EXCP_USER_ERROR; |
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| 321 | } |
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[469] | 322 | default: // this is a kernel error |
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[407] | 323 | { |
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[587] | 324 | printk("\n[KERNEL ERROR] in %s : thread %x in process %x\n" |
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[469] | 325 | " epc %x / badvaddr %x / is_ins %d\n", |
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| 326 | __FUNCTION__, this->trdid, this->process->pid, excPC, bad_vaddr, is_ins ); |
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[407] | 327 | |
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| 328 | return EXCP_KERNEL_PANIC; |
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| 329 | } |
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| 330 | } |
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[380] | 331 | } // end hal_mmu_exception() |
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| 332 | |
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| 333 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 334 | // This static function prints on the kernel terminal the saved context (core registers) |
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| 335 | // and the thread state of a faulty thread. |
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| 336 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 337 | // @ this : pointer on faulty thread descriptor. |
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[425] | 338 | // @ uzone : pointer on register array. |
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[407] | 339 | // @ error : EXCP_USER_ERROR or EXCP_KERNEL_PANIC |
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[380] | 340 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 341 | static void hal_exception_dump( thread_t * this, |
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[408] | 342 | reg_t * uzone, |
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[407] | 343 | error_t error ) |
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[380] | 344 | { |
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[408] | 345 | core_t * core = this->core; |
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| 346 | process_t * process = this->process; |
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[380] | 347 | |
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| 348 | // get pointers on TXT0 chdev |
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[407] | 349 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
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[380] | 350 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
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| 351 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
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| 352 | |
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| 353 | // get extended pointer on remote TXT0 chdev lock |
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| 354 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
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| 355 | |
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| 356 | // get TXT0 lock in busy waiting mode |
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[570] | 357 | remote_busylock_acquire( lock_xp ); |
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[380] | 358 | |
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[407] | 359 | if( error == EXCP_USER_ERROR ) |
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| 360 | { |
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[408] | 361 | nolock_printk("\n=== USER ERROR / trdid %x / pid %x / core[%x,%d] / cycle %d ===\n", |
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| 362 | this->trdid, process->pid, local_cxy, core->lid , (uint32_t)hal_get_cycles() ); |
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[407] | 363 | } |
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[380] | 364 | else |
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[407] | 365 | { |
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[469] | 366 | nolock_printk("\n=== KERNEL ERROR / trdid %x / pid %x / core[%x,%d] / cycle %d ===\n", |
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[408] | 367 | this->trdid, process->pid, local_cxy, core->lid , (uint32_t)hal_get_cycles() ); |
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[407] | 368 | } |
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[380] | 369 | |
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[570] | 370 | nolock_printk("busylocks = %d / blocked_vector = %X / flags = %X\n\n", |
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| 371 | this->busylocks, this->blocked, this->flags ); |
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[380] | 372 | |
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[408] | 373 | nolock_printk("c0_cr %X c0_epc %X c0_sr %X c0_th %X\n", |
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| 374 | uzone[UZ_CR], uzone[UZ_EPC], uzone[UZ_SR], uzone[UZ_TH] ); |
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[380] | 375 | |
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[408] | 376 | nolock_printk("c2_mode %X c2_ptpr %X\n", |
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| 377 | uzone[UZ_MODE], uzone[UZ_PTPR] ); |
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[380] | 378 | |
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[408] | 379 | nolock_printk("at_01 %X v0_2 %X v1_3 %X a0_4 %X a1_5 %X\n", |
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| 380 | uzone[UZ_AT], uzone[UZ_V0], uzone[UZ_V1], uzone[UZ_A0], uzone[UZ_A1] ); |
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| 381 | |
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| 382 | nolock_printk("a2_6 %X a3_7 %X t0_8 %X t1_9 %X t2_10 %X\n", |
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| 383 | uzone[UZ_A2], uzone[UZ_A3], uzone[UZ_T0], uzone[UZ_T1], uzone[UZ_T2] ); |
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[380] | 384 | |
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[408] | 385 | nolock_printk("t3_11 %X t4_12 %X t5_13 %X t6_14 %X t7_15 %X\n", |
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| 386 | uzone[UZ_T3], uzone[UZ_T4], uzone[UZ_T5], uzone[UZ_T6], uzone[UZ_T7] ); |
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[380] | 387 | |
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[408] | 388 | nolock_printk("s0_16 %X s1_17 %X s2_18 %X s3_19 %X s4_20 %X\n", |
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| 389 | uzone[UZ_S0], uzone[UZ_S1], uzone[UZ_S2], uzone[UZ_S3], uzone[UZ_S4] ); |
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[380] | 390 | |
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[408] | 391 | nolock_printk("s5_21 %X s6_22 %X s7_23 %X s8_24 %X ra_25 %X\n", |
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| 392 | uzone[UZ_S5], uzone[UZ_S6], uzone[UZ_S7], uzone[UZ_T8], uzone[UZ_T9] ); |
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[380] | 393 | |
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[408] | 394 | nolock_printk("gp_28 %X sp_29 %X S8_30 %X ra_31 %X\n", |
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| 395 | uzone[UZ_GP], uzone[UZ_SP], uzone[UZ_S8], uzone[UZ_RA] ); |
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[407] | 396 | |
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[380] | 397 | // release the lock |
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[570] | 398 | remote_busylock_release( lock_xp ); |
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[380] | 399 | |
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| 400 | } // end hal_exception_dump() |
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| 401 | |
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[408] | 402 | /////////////////////// |
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[481] | 403 | void hal_do_exception( void ) |
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[16] | 404 | { |
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[408] | 405 | uint32_t * uzone; |
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| 406 | thread_t * this; |
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| 407 | error_t error; |
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| 408 | uint32_t excCode; // 4 bits XCODE from CP0_CR |
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[437] | 409 | uint32_t excPC; // fauty instruction address |
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[16] | 410 | |
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[408] | 411 | // get pointer on faulty thread uzone |
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| 412 | this = CURRENT_THREAD; |
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[425] | 413 | uzone = (uint32_t *)CURRENT_THREAD->uzone_current; |
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[408] | 414 | |
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[437] | 415 | // get XCODE and EPC from UZONE |
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[408] | 416 | excCode = (uzone[UZ_CR] >> 2) & 0xF; |
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[437] | 417 | excPC = uzone[UZ_EPC]; |
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[16] | 418 | |
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[438] | 419 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 420 | uint32_t cycle = (uint32_t)hal_get_cycles(); |
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[438] | 421 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[457] | 422 | printk("\n[DBG] %s : thread %x in process %x enter / core[%x,%d] / epc %x / xcode %x / cycle %d\n", |
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| 423 | __FUNCTION__, this->trdid, this->process->pid, local_cxy, this->core->lid, excPC, excCode, cycle ); |
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[432] | 424 | #endif |
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[406] | 425 | |
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[16] | 426 | switch(excCode) |
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| 427 | { |
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[469] | 428 | case XCODE_DBE: // Data Bus Error : can be non fatal if page fault |
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[406] | 429 | { |
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[437] | 430 | error = hal_mmu_exception( this , excPC , false ); // data MMU exception |
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[406] | 431 | break; |
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| 432 | } |
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[469] | 433 | case XCODE_IBE: // Instruction Bus Error : can be non fatal if page fault |
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[16] | 434 | { |
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[437] | 435 | error = hal_mmu_exception( this , excPC , true ); // ins MMU exception |
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[406] | 436 | break; |
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[16] | 437 | } |
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[469] | 438 | case XCODE_CPU: // Coprocessor unavailable : can be non fatal if FPU |
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[16] | 439 | { |
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[469] | 440 | if( ((uzone[UZ_CR] >> 28) & 0x3) == 1 ) // FPU |
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[16] | 441 | { |
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[469] | 442 | error = hal_fpu_exception( this ); |
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[16] | 443 | } |
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[469] | 444 | else // undefined coprocessor |
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[16] | 445 | { |
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[469] | 446 | printk("\n[USER_ERROR] in %s for thread %x in process %x\n" |
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| 447 | " undefined coprocessor / epc %x\n", |
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| 448 | __FUNCTION__, this->trdid, this->process->pid, excPC ); |
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| 449 | |
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[16] | 450 | error = EXCP_USER_ERROR; |
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| 451 | } |
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[406] | 452 | break; |
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[16] | 453 | } |
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[469] | 454 | case XCODE_OVR: // Arithmetic Overflow : user fatal error |
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| 455 | { |
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| 456 | printk("\n[USER_ERROR] in %s for thread %x in process %x\n" |
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| 457 | " arithmetic overflow / epc %x\n", |
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| 458 | __FUNCTION__, this->trdid, this->process->pid, excPC ); |
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| 459 | |
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| 460 | error = EXCP_USER_ERROR; |
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| 461 | break; |
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| 462 | } |
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| 463 | case XCODE_RI: // Reserved Instruction : user fatal error |
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| 464 | { |
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| 465 | printk("\n[USER_ERROR] in %s for thread %x in process %x\n" |
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| 466 | " reserved instruction / epc %x\n", |
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| 467 | __FUNCTION__, this->trdid, this->process->pid, excPC ); |
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| 468 | |
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| 469 | error = EXCP_USER_ERROR; |
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| 470 | break; |
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| 471 | } |
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[380] | 472 | case XCODE_ADEL: // user fatal error |
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[16] | 473 | { |
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[469] | 474 | printk("\n[USER_ERROR] in %s for thread %x in process %x\n" |
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| 475 | " illegal data load address / epc %x\n", |
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| 476 | __FUNCTION__, this->trdid, this->process->pid, excPC ); |
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| 477 | |
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[16] | 478 | error = EXCP_USER_ERROR; |
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[406] | 479 | break; |
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[16] | 480 | } |
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[469] | 481 | case XCODE_ADES: // user fatal error |
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| 482 | { |
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| 483 | printk("\n[USER_ERROR] in %s for thread %x in process %x\n" |
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| 484 | " illegal data store address / epc %x\n", |
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| 485 | __FUNCTION__, this->trdid, this->process->pid, excPC ); |
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| 486 | |
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| 487 | error = EXCP_USER_ERROR; |
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| 488 | break; |
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| 489 | } |
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[16] | 490 | default: |
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| 491 | { |
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[317] | 492 | error = EXCP_KERNEL_PANIC; |
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[16] | 493 | } |
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| 494 | } |
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| 495 | |
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| 496 | // analyse error code |
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[317] | 497 | if( error == EXCP_USER_ERROR ) // user error => kill user process |
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[16] | 498 | { |
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[408] | 499 | hal_exception_dump( this , uzone , error ); |
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[407] | 500 | |
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[440] | 501 | sys_exit( EXIT_FAILURE ); |
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[16] | 502 | } |
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| 503 | else if( error == EXCP_KERNEL_PANIC ) // kernel error => kernel panic |
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| 504 | { |
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[408] | 505 | hal_exception_dump( this , uzone , error ); |
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[425] | 506 | |
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[492] | 507 | assert( false , "Exception raised kernel panic see information below.\n" ); |
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[16] | 508 | } |
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[406] | 509 | |
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[438] | 510 | #if DEBUG_HAL_EXCEPTIONS |
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[432] | 511 | cycle = (uint32_t)hal_get_cycles(); |
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[438] | 512 | if( DEBUG_HAL_EXCEPTIONS < cycle ) |
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[457] | 513 | printk("\n[DBG] %s : thread %x in process %x exit / core[%x,%d] / epc %x / xcode %x / cycle %d\n", |
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| 514 | __FUNCTION__, this->trdid, this->process->pid, local_cxy, this->core->lid, excPC, excCode, cycle ); |
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[432] | 515 | #endif |
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[406] | 516 | |
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[16] | 517 | } // end hal_do_exception() |
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| 518 | |
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| 519 | |
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