[c81ebf9] | 1 | // -*- Mode: CFA -*- |
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| 2 | // |
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| 3 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
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| 4 | // |
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| 5 | // The contents of this file are covered under the licence agreement in the |
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| 6 | // file "LICENCE" distributed with Cforall. |
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| 7 | // |
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| 8 | // signal.c -- |
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| 9 | // |
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| 10 | // Author : Thierry Delisle |
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| 11 | // Created On : Mon Jun 5 14:20:42 2017 |
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| 12 | // Last Modified By : Thierry Delisle |
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| 13 | // Last Modified On : -- |
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| 14 | // Update Count : 0 |
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| 15 | // |
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| 16 | |
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[2ac095d] | 17 | #include "libhdr.h" |
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[c81ebf9] | 18 | #include "preemption.h" |
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| 19 | |
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| 20 | extern "C" { |
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[82ff5845] | 21 | #include <errno.h> |
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[1c273d0] | 22 | #include <execinfo.h> |
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[4e6fb8e] | 23 | #define __USE_GNU |
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[c81ebf9] | 24 | #include <signal.h> |
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[4e6fb8e] | 25 | #undef __USE_GNU |
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[82ff5845] | 26 | #include <stdio.h> |
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| 27 | #include <string.h> |
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| 28 | #include <unistd.h> |
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[c81ebf9] | 29 | } |
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| 30 | |
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[1c273d0] | 31 | |
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| 32 | #ifdef __USE_STREAM__ |
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| 33 | #include "fstream" |
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| 34 | #endif |
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[82ff5845] | 35 | |
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| 36 | #define __CFA_DEFAULT_PREEMPTION__ 10000 |
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[c81ebf9] | 37 | |
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| 38 | __attribute__((weak)) unsigned int default_preemption() { |
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| 39 | return __CFA_DEFAULT_PREEMPTION__; |
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| 40 | } |
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| 41 | |
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[82ff5845] | 42 | #define __CFA_SIGCXT__ ucontext_t * |
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| 43 | #define __CFA_SIGPARMS__ __attribute__((unused)) int sig, __attribute__((unused)) siginfo_t *sfp, __attribute__((unused)) __CFA_SIGCXT__ cxt |
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| 44 | |
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[c81ebf9] | 45 | static void preempt( processor * this ); |
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| 46 | static void timeout( thread_desc * this ); |
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| 47 | |
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[82ff5845] | 48 | void sigHandler_ctxSwitch( __CFA_SIGPARMS__ ); |
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| 49 | void sigHandler_alarm ( __CFA_SIGPARMS__ ); |
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[1c273d0] | 50 | void sigHandler_segv ( __CFA_SIGPARMS__ ); |
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| 51 | void sigHandler_abort ( __CFA_SIGPARMS__ ); |
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[82ff5845] | 52 | |
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| 53 | static void __kernel_sigaction( int sig, void (*handler)(__CFA_SIGPARMS__), int flags ); |
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[cd17862] | 54 | LIB_DEBUG_DO( bool validate( alarm_list_t * this ); ) |
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| 55 | |
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| 56 | #ifdef __x86_64__ |
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| 57 | #define CFA_REG_IP REG_RIP |
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| 58 | #else |
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| 59 | #define CFA_REG_IP REG_EIP |
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| 60 | #endif |
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| 61 | |
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[82ff5845] | 62 | |
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[c81ebf9] | 63 | //============================================================================================= |
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| 64 | // Kernel Preemption logic |
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| 65 | //============================================================================================= |
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| 66 | |
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| 67 | void tick_preemption() { |
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[1c273d0] | 68 | // LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, "Ticking preemption\n" ); |
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[82ff5845] | 69 | |
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[c81ebf9] | 70 | alarm_list_t * alarms = &systemProcessor->alarms; |
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| 71 | __cfa_time_t currtime = __kernel_get_time(); |
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| 72 | while( alarms->head && alarms->head->alarm < currtime ) { |
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| 73 | alarm_node_t * node = pop(alarms); |
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[1c273d0] | 74 | // LIB_DEBUG_PRINT_BUFFER_LOCAL( STDERR_FILENO, "Ticking %p\n", node ); |
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| 75 | |
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[c81ebf9] | 76 | if( node->kernel_alarm ) { |
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| 77 | preempt( node->proc ); |
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| 78 | } |
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| 79 | else { |
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| 80 | timeout( node->thrd ); |
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| 81 | } |
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| 82 | |
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[1c273d0] | 83 | verify( validate( alarms ) ); |
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[4e6fb8e] | 84 | |
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[c81ebf9] | 85 | if( node->period > 0 ) { |
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[82ff5845] | 86 | node->alarm = currtime + node->period; |
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[c81ebf9] | 87 | insert( alarms, node ); |
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| 88 | } |
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| 89 | else { |
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| 90 | node->set = false; |
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| 91 | } |
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| 92 | } |
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| 93 | |
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| 94 | if( alarms->head ) { |
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| 95 | __kernel_set_timer( alarms->head->alarm - currtime ); |
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| 96 | } |
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[82ff5845] | 97 | |
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[0b33412] | 98 | verify( validate( alarms ) ); |
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[1c273d0] | 99 | // LIB_DEBUG_PRINT_BUFFER_LOCAL( STDERR_FILENO, "Ticking preemption done\n" ); |
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[c81ebf9] | 100 | } |
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| 101 | |
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| 102 | void update_preemption( processor * this, __cfa_time_t duration ) { |
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[1c273d0] | 103 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, "Processor : %p updating preemption to %lu\n", this, duration ); |
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[82ff5845] | 104 | |
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[c81ebf9] | 105 | alarm_node_t * alarm = this->preemption_alarm; |
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[82ff5845] | 106 | duration *= 1000; |
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[c81ebf9] | 107 | |
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| 108 | // Alarms need to be enabled |
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| 109 | if ( duration > 0 && !alarm->set ) { |
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| 110 | alarm->alarm = __kernel_get_time() + duration; |
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| 111 | alarm->period = duration; |
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| 112 | register_self( alarm ); |
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| 113 | } |
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| 114 | // Zero duraction but alarm is set |
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| 115 | else if ( duration == 0 && alarm->set ) { |
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| 116 | unregister_self( alarm ); |
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| 117 | alarm->alarm = 0; |
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| 118 | alarm->period = 0; |
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| 119 | } |
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| 120 | // If alarm is different from previous, change it |
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| 121 | else if ( duration > 0 && alarm->period != duration ) { |
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| 122 | unregister_self( alarm ); |
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| 123 | alarm->alarm = __kernel_get_time() + duration; |
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| 124 | alarm->period = duration; |
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| 125 | register_self( alarm ); |
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| 126 | } |
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| 127 | } |
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| 128 | |
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| 129 | //============================================================================================= |
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[cd17862] | 130 | // Kernel Signal Tools |
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[c81ebf9] | 131 | //============================================================================================= |
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| 132 | |
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[b227f68] | 133 | LIB_DEBUG_DO( static thread_local void * last_interrupt = 0; ) |
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| 134 | |
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[82ff5845] | 135 | extern "C" { |
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| 136 | void disable_interrupts() { |
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[4e6fb8e] | 137 | __attribute__((unused)) unsigned short new_val = __atomic_add_fetch_2( &disable_preempt_count, 1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 138 | verify( new_val < (unsigned short)65_000 ); |
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| 139 | verify( new_val != (unsigned short) 0 ); |
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[82ff5845] | 140 | } |
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| 141 | |
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| 142 | void enable_interrupts_noRF() { |
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[2ac095d] | 143 | __attribute__((unused)) unsigned short prev = __atomic_fetch_add_2( &disable_preempt_count, -1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 144 | verify( prev != (unsigned short) 0 ); |
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[82ff5845] | 145 | } |
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| 146 | |
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[2ac095d] | 147 | void enable_interrupts( DEBUG_CTX_PARAM ) { |
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[1c273d0] | 148 | processor * proc = this_processor; |
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| 149 | thread_desc * thrd = this_thread; |
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[4e6fb8e] | 150 | unsigned short prev = __atomic_fetch_add_2( &disable_preempt_count, -1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 151 | verify( prev != (unsigned short) 0 ); |
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[1c273d0] | 152 | if( prev == 1 && proc->pending_preemption ) { |
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| 153 | proc->pending_preemption = false; |
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| 154 | BlockInternal( thrd ); |
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[82ff5845] | 155 | } |
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[4e6fb8e] | 156 | |
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[2ac095d] | 157 | LIB_DEBUG_DO( proc->last_enable = caller; ) |
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[82ff5845] | 158 | } |
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| 159 | } |
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| 160 | |
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[1c273d0] | 161 | static inline void signal_unblock( int sig ) { |
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[82ff5845] | 162 | sigset_t mask; |
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| 163 | sigemptyset( &mask ); |
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[1c273d0] | 164 | sigaddset( &mask, sig ); |
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[82ff5845] | 165 | |
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[47ecf2b] | 166 | if ( pthread_sigmask( SIG_UNBLOCK, &mask, NULL ) == -1 ) { |
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| 167 | abortf( "internal error, pthread_sigmask" ); |
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[cd17862] | 168 | } |
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[82ff5845] | 169 | } |
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| 170 | |
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[cd17862] | 171 | static inline void signal_block( int sig ) { |
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| 172 | sigset_t mask; |
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| 173 | sigemptyset( &mask ); |
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| 174 | sigaddset( &mask, sig ); |
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[47ecf2b] | 175 | |
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[cd17862] | 176 | if ( pthread_sigmask( SIG_BLOCK, &mask, NULL ) == -1 ) { |
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| 177 | abortf( "internal error, pthread_sigmask" ); |
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| 178 | } |
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| 179 | } |
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[47ecf2b] | 180 | |
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[c81ebf9] | 181 | static inline bool preemption_ready() { |
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[4e6fb8e] | 182 | return disable_preempt_count == 0; |
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[c81ebf9] | 183 | } |
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| 184 | |
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| 185 | static inline void defer_ctxSwitch() { |
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| 186 | this_processor->pending_preemption = true; |
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| 187 | } |
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| 188 | |
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| 189 | static inline void defer_alarm() { |
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| 190 | systemProcessor->pending_alarm = true; |
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| 191 | } |
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| 192 | |
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[cd17862] | 193 | static void preempt( processor * this ) { |
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| 194 | pthread_kill( this->kernel_thread, SIGUSR1 ); |
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[1c273d0] | 195 | } |
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[82ff5845] | 196 | |
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[cd17862] | 197 | static void timeout( thread_desc * this ) { |
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| 198 | //TODO : implement waking threads |
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| 199 | } |
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| 200 | |
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| 201 | //============================================================================================= |
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| 202 | // Kernel Signal Startup/Shutdown logic |
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| 203 | //============================================================================================= |
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| 204 | |
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| 205 | static pthread_t alarm_thread; |
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| 206 | void * alarm_loop( __attribute__((unused)) void * args ); |
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| 207 | |
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| 208 | void kernel_start_preemption() { |
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| 209 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting preemption\n"); |
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| 210 | __kernel_sigaction( SIGUSR1, sigHandler_ctxSwitch, SA_SIGINFO ); |
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| 211 | __kernel_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO ); |
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| 212 | __kernel_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO ); |
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| 213 | |
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| 214 | signal_block( SIGALRM ); |
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| 215 | |
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| 216 | pthread_create( &alarm_thread, NULL, alarm_loop, NULL ); |
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| 217 | } |
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| 218 | |
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| 219 | void kernel_stop_preemption() { |
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| 220 | sigset_t mask; |
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| 221 | sigfillset( &mask ); |
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| 222 | sigprocmask( SIG_BLOCK, &mask, NULL ); |
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| 223 | |
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| 224 | pthread_kill( alarm_thread, SIGINT ); |
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| 225 | pthread_join( alarm_thread, NULL ); |
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| 226 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption stopped\n"); |
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| 227 | } |
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| 228 | |
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| 229 | void ?{}( preemption_scope * this, processor * proc ) { |
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| 230 | (&this->alarm){ proc }; |
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| 231 | this->proc = proc; |
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| 232 | this->proc->preemption_alarm = &this->alarm; |
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| 233 | update_preemption( this->proc, this->proc->preemption ); |
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| 234 | } |
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| 235 | |
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| 236 | void ^?{}( preemption_scope * this ) { |
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| 237 | disable_interrupts(); |
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| 238 | |
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| 239 | update_preemption( this->proc, 0 ); |
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| 240 | } |
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| 241 | |
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| 242 | //============================================================================================= |
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| 243 | // Kernel Signal Handlers |
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| 244 | //============================================================================================= |
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[47ecf2b] | 245 | |
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[1c273d0] | 246 | void sigHandler_ctxSwitch( __CFA_SIGPARMS__ ) { |
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[47ecf2b] | 247 | LIB_DEBUG_DO( last_interrupt = (void *)(cxt->uc_mcontext.gregs[CFA_REG_IP]); ) |
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[c81ebf9] | 248 | if( preemption_ready() ) { |
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[1c273d0] | 249 | signal_unblock( SIGUSR1 ); |
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| 250 | BlockInternal( (thread_desc*)this_thread ); |
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[c81ebf9] | 251 | } |
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| 252 | else { |
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| 253 | defer_ctxSwitch(); |
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| 254 | } |
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| 255 | } |
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| 256 | |
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[cd17862] | 257 | // void sigHandler_alarm( __CFA_SIGPARMS__ ) { |
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| 258 | // LIB_DEBUG_DO( last_interrupt = (void *)(cxt->uc_mcontext.gregs[CFA_REG_IP]); ) |
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| 259 | // verify( this_processor == systemProcessor ); |
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[82ff5845] | 260 | |
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[cd17862] | 261 | // if( try_lock( &systemProcessor->alarm_lock DEBUG_CTX2 ) ) { |
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| 262 | // tick_preemption(); |
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| 263 | // systemProcessor->pending_alarm = false; |
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| 264 | // unlock( &systemProcessor->alarm_lock ); |
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| 265 | // } |
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| 266 | // else { |
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| 267 | // defer_alarm(); |
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| 268 | // } |
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[82ff5845] | 269 | |
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[cd17862] | 270 | // signal_unblock( SIGALRM ); |
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[1c273d0] | 271 | |
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[cd17862] | 272 | // if( preemption_ready() && this_processor->pending_preemption ) { |
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[47ecf2b] | 273 | |
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[cd17862] | 274 | // this_processor->pending_preemption = false; |
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| 275 | // BlockInternal( (thread_desc*)this_thread ); |
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| 276 | // } |
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| 277 | // } |
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[c81ebf9] | 278 | |
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[cd17862] | 279 | void * alarm_loop( __attribute__((unused)) void * args ) { |
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| 280 | sigset_t mask; |
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| 281 | sigemptyset( &mask ); |
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| 282 | sigaddset( &mask, SIGALRM ); |
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| 283 | sigaddset( &mask, SIGUSR2 ); |
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| 284 | sigaddset( &mask, SIGINT ); |
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| 285 | |
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| 286 | if ( pthread_sigmask( SIG_BLOCK, &mask, NULL ) == -1 ) { |
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| 287 | abortf( "internal error, pthread_sigmask" ); |
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[82ff5845] | 288 | } |
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[c81ebf9] | 289 | |
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[cd17862] | 290 | while( true ) { |
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| 291 | int sig; |
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| 292 | if( sigwait( &mask, &sig ) != 0 ) { |
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| 293 | abortf( "internal error, sigwait" ); |
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| 294 | } |
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| 295 | |
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| 296 | switch( sig) { |
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| 297 | case SIGALRM: |
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| 298 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption thread tick\n"); |
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| 299 | lock( &systemProcessor->alarm_lock DEBUG_CTX2 ); |
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| 300 | tick_preemption(); |
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| 301 | unlock( &systemProcessor->alarm_lock ); |
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| 302 | break; |
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| 303 | case SIGUSR2: |
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| 304 | //TODO other actions |
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| 305 | break; |
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| 306 | case SIGINT: |
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| 307 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption thread stopping\n"); |
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| 308 | return NULL; |
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| 309 | default: |
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| 310 | abortf( "internal error, sigwait returned sig %d", sig ); |
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| 311 | break; |
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| 312 | } |
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| 313 | } |
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[82ff5845] | 314 | } |
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| 315 | |
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| 316 | static void __kernel_sigaction( int sig, void (*handler)(__CFA_SIGPARMS__), int flags ) { |
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| 317 | struct sigaction act; |
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| 318 | |
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| 319 | act.sa_sigaction = (void (*)(int, siginfo_t *, void *))handler; |
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[1c273d0] | 320 | act.sa_flags = flags; |
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| 321 | |
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| 322 | if ( sigaction( sig, &act, NULL ) == -1 ) { |
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| 323 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, |
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| 324 | " __kernel_sigaction( sig:%d, handler:%p, flags:%d ), problem installing signal handler, error(%d) %s.\n", |
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| 325 | sig, handler, flags, errno, strerror( errno ) |
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| 326 | ); |
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| 327 | _exit( EXIT_FAILURE ); |
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| 328 | } |
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| 329 | } |
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| 330 | |
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| 331 | typedef void (*sa_handler_t)(int); |
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| 332 | |
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| 333 | static void __kernel_sigdefault( int sig ) { |
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| 334 | struct sigaction act; |
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| 335 | |
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| 336 | // act.sa_handler = SIG_DFL; |
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| 337 | act.sa_flags = 0; |
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| 338 | sigemptyset( &act.sa_mask ); |
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[82ff5845] | 339 | |
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| 340 | if ( sigaction( sig, &act, NULL ) == -1 ) { |
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[1c273d0] | 341 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, |
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| 342 | " __kernel_sigdefault( sig:%d ), problem reseting signal handler, error(%d) %s.\n", |
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| 343 | sig, errno, strerror( errno ) |
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| 344 | ); |
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[82ff5845] | 345 | _exit( EXIT_FAILURE ); |
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[1c273d0] | 346 | } |
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| 347 | } |
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| 348 | |
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| 349 | //============================================================================================= |
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| 350 | // Terminating Signals logic |
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| 351 | //============================================================================================= |
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| 352 | |
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| 353 | LIB_DEBUG_DO( |
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| 354 | static void __kernel_backtrace( int start ) { |
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| 355 | // skip first N stack frames |
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| 356 | |
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| 357 | enum { Frames = 50 }; |
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| 358 | void * array[Frames]; |
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| 359 | int size = backtrace( array, Frames ); |
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| 360 | char ** messages = backtrace_symbols( array, size ); |
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| 361 | |
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| 362 | // find executable name |
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| 363 | *index( messages[0], '(' ) = '\0'; |
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| 364 | #ifdef __USE_STREAM__ |
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| 365 | serr | "Stack back trace for:" | messages[0] | endl; |
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| 366 | #else |
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| 367 | fprintf( stderr, "Stack back trace for: %s\n", messages[0]); |
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| 368 | #endif |
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| 369 | |
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| 370 | // skip last 2 stack frames after main |
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| 371 | for ( int i = start; i < size && messages != NULL; i += 1 ) { |
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| 372 | char * name = NULL; |
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| 373 | char * offset_begin = NULL; |
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| 374 | char * offset_end = NULL; |
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| 375 | |
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| 376 | for ( char *p = messages[i]; *p; ++p ) { |
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| 377 | // find parantheses and +offset |
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| 378 | if ( *p == '(' ) { |
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| 379 | name = p; |
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| 380 | } |
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| 381 | else if ( *p == '+' ) { |
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| 382 | offset_begin = p; |
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| 383 | } |
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| 384 | else if ( *p == ')' ) { |
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| 385 | offset_end = p; |
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| 386 | break; |
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| 387 | } |
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| 388 | } |
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| 389 | |
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| 390 | // if line contains symbol print it |
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| 391 | int frameNo = i - start; |
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| 392 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
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| 393 | // delimit strings |
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| 394 | *name++ = '\0'; |
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| 395 | *offset_begin++ = '\0'; |
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| 396 | *offset_end++ = '\0'; |
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| 397 | |
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| 398 | #ifdef __USE_STREAM__ |
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| 399 | serr | "(" | frameNo | ")" | messages[i] | ":" |
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| 400 | | name | "+" | offset_begin | offset_end | endl; |
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| 401 | #else |
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| 402 | fprintf( stderr, "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end); |
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| 403 | #endif |
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| 404 | } |
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| 405 | // otherwise, print the whole line |
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| 406 | else { |
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| 407 | #ifdef __USE_STREAM__ |
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| 408 | serr | "(" | frameNo | ")" | messages[i] | endl; |
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| 409 | #else |
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| 410 | fprintf( stderr, "(%i) %s\n", frameNo, messages[i] ); |
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| 411 | #endif |
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| 412 | } |
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| 413 | } |
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| 414 | |
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| 415 | free( messages ); |
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| 416 | } |
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| 417 | ) |
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| 418 | |
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| 419 | void sigHandler_segv( __CFA_SIGPARMS__ ) { |
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| 420 | LIB_DEBUG_DO( |
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| 421 | #ifdef __USE_STREAM__ |
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| 422 | serr | "*CFA runtime error* program cfa-cpp terminated with" |
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| 423 | | (sig == SIGSEGV ? "segment fault." : "bus error.") |
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| 424 | | endl; |
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| 425 | #else |
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| 426 | fprintf( stderr, "*CFA runtime error* program cfa-cpp terminated with %s\n", sig == SIGSEGV ? "segment fault." : "bus error." ); |
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| 427 | #endif |
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| 428 | |
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| 429 | // skip first 2 stack frames |
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| 430 | __kernel_backtrace( 1 ); |
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| 431 | ) |
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| 432 | exit( EXIT_FAILURE ); |
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[0b33412] | 433 | } |
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[1c273d0] | 434 | |
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| 435 | // void sigHandler_abort( __CFA_SIGPARMS__ ) { |
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| 436 | // // skip first 6 stack frames |
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| 437 | // LIB_DEBUG_DO( __kernel_backtrace( 6 ); ) |
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| 438 | |
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| 439 | // // reset default signal handler |
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| 440 | // __kernel_sigdefault( SIGABRT ); |
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| 441 | |
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| 442 | // raise( SIGABRT ); |
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| 443 | // } |
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