[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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| 68 | alarm_list_t * alarms = &systemProcessor->alarms; |
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| 69 | __cfa_time_t currtime = __kernel_get_time(); |
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[8cb529e] | 70 | |
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| 71 | // LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, "Ticking preemption @ %llu\n", currtime ); |
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[c81ebf9] | 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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[8cb529e] | 85 | __cfa_time_t period = node->period; |
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| 86 | if( period > 0 ) { |
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| 87 | node->alarm = currtime + period; |
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| 88 | // LIB_DEBUG_PRINT_BUFFER_LOCAL( STDERR_FILENO, "Reinsert %p @ %llu (%llu + %llu)\n", node, node->alarm, currtime, period ); |
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[c81ebf9] | 89 | insert( alarms, node ); |
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| 90 | } |
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| 91 | else { |
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| 92 | node->set = false; |
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| 93 | } |
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| 94 | } |
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| 95 | |
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| 96 | if( alarms->head ) { |
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| 97 | __kernel_set_timer( alarms->head->alarm - currtime ); |
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| 98 | } |
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[82ff5845] | 99 | |
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[0b33412] | 100 | verify( validate( alarms ) ); |
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[1c273d0] | 101 | // LIB_DEBUG_PRINT_BUFFER_LOCAL( STDERR_FILENO, "Ticking preemption done\n" ); |
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[c81ebf9] | 102 | } |
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| 103 | |
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| 104 | void update_preemption( processor * this, __cfa_time_t duration ) { |
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[8cb529e] | 105 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, "Processor : %p updating preemption to %llu\n", this, duration ); |
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[82ff5845] | 106 | |
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[c81ebf9] | 107 | alarm_node_t * alarm = this->preemption_alarm; |
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[82ff5845] | 108 | duration *= 1000; |
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[c81ebf9] | 109 | |
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| 110 | // Alarms need to be enabled |
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| 111 | if ( duration > 0 && !alarm->set ) { |
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| 112 | alarm->alarm = __kernel_get_time() + duration; |
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| 113 | alarm->period = duration; |
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| 114 | register_self( alarm ); |
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| 115 | } |
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| 116 | // Zero duraction but alarm is set |
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| 117 | else if ( duration == 0 && alarm->set ) { |
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| 118 | unregister_self( alarm ); |
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| 119 | alarm->alarm = 0; |
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| 120 | alarm->period = 0; |
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| 121 | } |
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| 122 | // If alarm is different from previous, change it |
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| 123 | else if ( duration > 0 && alarm->period != duration ) { |
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| 124 | unregister_self( alarm ); |
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| 125 | alarm->alarm = __kernel_get_time() + duration; |
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| 126 | alarm->period = duration; |
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| 127 | register_self( alarm ); |
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| 128 | } |
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| 129 | } |
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| 130 | |
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| 131 | //============================================================================================= |
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[cd17862] | 132 | // Kernel Signal Tools |
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[c81ebf9] | 133 | //============================================================================================= |
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| 134 | |
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[b227f68] | 135 | LIB_DEBUG_DO( static thread_local void * last_interrupt = 0; ) |
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| 136 | |
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[82ff5845] | 137 | extern "C" { |
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| 138 | void disable_interrupts() { |
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[4e6fb8e] | 139 | __attribute__((unused)) unsigned short new_val = __atomic_add_fetch_2( &disable_preempt_count, 1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 140 | verify( new_val < (unsigned short)65_000 ); |
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| 141 | verify( new_val != (unsigned short) 0 ); |
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[82ff5845] | 142 | } |
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| 143 | |
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| 144 | void enable_interrupts_noRF() { |
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[2ac095d] | 145 | __attribute__((unused)) unsigned short prev = __atomic_fetch_add_2( &disable_preempt_count, -1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 146 | verify( prev != (unsigned short) 0 ); |
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[82ff5845] | 147 | } |
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| 148 | |
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[2ac095d] | 149 | void enable_interrupts( DEBUG_CTX_PARAM ) { |
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[1c273d0] | 150 | processor * proc = this_processor; |
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| 151 | thread_desc * thrd = this_thread; |
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[4e6fb8e] | 152 | unsigned short prev = __atomic_fetch_add_2( &disable_preempt_count, -1, __ATOMIC_SEQ_CST ); |
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[0b33412] | 153 | verify( prev != (unsigned short) 0 ); |
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[1c273d0] | 154 | if( prev == 1 && proc->pending_preemption ) { |
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| 155 | proc->pending_preemption = false; |
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| 156 | BlockInternal( thrd ); |
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[82ff5845] | 157 | } |
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[4e6fb8e] | 158 | |
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[2ac095d] | 159 | LIB_DEBUG_DO( proc->last_enable = caller; ) |
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[82ff5845] | 160 | } |
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| 161 | } |
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| 162 | |
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[1c273d0] | 163 | static inline void signal_unblock( int sig ) { |
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[82ff5845] | 164 | sigset_t mask; |
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| 165 | sigemptyset( &mask ); |
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[1c273d0] | 166 | sigaddset( &mask, sig ); |
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[82ff5845] | 167 | |
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[47ecf2b] | 168 | if ( pthread_sigmask( SIG_UNBLOCK, &mask, NULL ) == -1 ) { |
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| 169 | abortf( "internal error, pthread_sigmask" ); |
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[cd17862] | 170 | } |
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[82ff5845] | 171 | } |
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| 172 | |
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[cd17862] | 173 | static inline void signal_block( int sig ) { |
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| 174 | sigset_t mask; |
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| 175 | sigemptyset( &mask ); |
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| 176 | sigaddset( &mask, sig ); |
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[47ecf2b] | 177 | |
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[cd17862] | 178 | if ( pthread_sigmask( SIG_BLOCK, &mask, NULL ) == -1 ) { |
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| 179 | abortf( "internal error, pthread_sigmask" ); |
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| 180 | } |
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| 181 | } |
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[47ecf2b] | 182 | |
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[c81ebf9] | 183 | static inline bool preemption_ready() { |
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[d6ff3ff] | 184 | return disable_preempt_count == 0 && !preemption_in_progress; |
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[c81ebf9] | 185 | } |
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| 186 | |
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| 187 | static inline void defer_ctxSwitch() { |
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| 188 | this_processor->pending_preemption = true; |
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| 189 | } |
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| 190 | |
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| 191 | static inline void defer_alarm() { |
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| 192 | systemProcessor->pending_alarm = true; |
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| 193 | } |
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| 194 | |
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[cd17862] | 195 | static void preempt( processor * this ) { |
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| 196 | pthread_kill( this->kernel_thread, SIGUSR1 ); |
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[1c273d0] | 197 | } |
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[82ff5845] | 198 | |
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[cd17862] | 199 | static void timeout( thread_desc * this ) { |
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| 200 | //TODO : implement waking threads |
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| 201 | } |
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| 202 | |
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| 203 | //============================================================================================= |
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| 204 | // Kernel Signal Startup/Shutdown logic |
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| 205 | //============================================================================================= |
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| 206 | |
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| 207 | static pthread_t alarm_thread; |
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| 208 | void * alarm_loop( __attribute__((unused)) void * args ); |
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| 209 | |
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| 210 | void kernel_start_preemption() { |
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| 211 | LIB_DEBUG_PRINT_SAFE("Kernel : Starting preemption\n"); |
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| 212 | __kernel_sigaction( SIGUSR1, sigHandler_ctxSwitch, SA_SIGINFO ); |
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[f2b12406] | 213 | // __kernel_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO ); |
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| 214 | // __kernel_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO ); |
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[cd17862] | 215 | |
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| 216 | signal_block( SIGALRM ); |
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| 217 | |
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| 218 | pthread_create( &alarm_thread, NULL, alarm_loop, NULL ); |
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| 219 | } |
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| 220 | |
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| 221 | void kernel_stop_preemption() { |
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[d6ff3ff] | 222 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption stopping\n"); |
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| 223 | |
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[cd17862] | 224 | sigset_t mask; |
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| 225 | sigfillset( &mask ); |
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| 226 | sigprocmask( SIG_BLOCK, &mask, NULL ); |
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| 227 | |
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[a0b3e32] | 228 | sigval val = { 1 }; |
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| 229 | pthread_sigqueue( alarm_thread, SIGALRM, val ); |
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[cd17862] | 230 | pthread_join( alarm_thread, NULL ); |
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| 231 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption stopped\n"); |
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| 232 | } |
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| 233 | |
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| 234 | void ?{}( preemption_scope * this, processor * proc ) { |
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| 235 | (&this->alarm){ proc }; |
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| 236 | this->proc = proc; |
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| 237 | this->proc->preemption_alarm = &this->alarm; |
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| 238 | update_preemption( this->proc, this->proc->preemption ); |
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| 239 | } |
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| 240 | |
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| 241 | void ^?{}( preemption_scope * this ) { |
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| 242 | disable_interrupts(); |
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| 243 | |
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| 244 | update_preemption( this->proc, 0 ); |
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| 245 | } |
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| 246 | |
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| 247 | //============================================================================================= |
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| 248 | // Kernel Signal Handlers |
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| 249 | //============================================================================================= |
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[47ecf2b] | 250 | |
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[1c273d0] | 251 | void sigHandler_ctxSwitch( __CFA_SIGPARMS__ ) { |
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[47ecf2b] | 252 | LIB_DEBUG_DO( last_interrupt = (void *)(cxt->uc_mcontext.gregs[CFA_REG_IP]); ) |
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[c81ebf9] | 253 | if( preemption_ready() ) { |
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[d6ff3ff] | 254 | preemption_in_progress = true; |
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[1c273d0] | 255 | signal_unblock( SIGUSR1 ); |
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[d6ff3ff] | 256 | this_processor->pending_preemption = false; |
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| 257 | preemption_in_progress = false; |
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[1c273d0] | 258 | BlockInternal( (thread_desc*)this_thread ); |
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[c81ebf9] | 259 | } |
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| 260 | else { |
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| 261 | defer_ctxSwitch(); |
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| 262 | } |
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| 263 | } |
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| 264 | |
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[cd17862] | 265 | void * alarm_loop( __attribute__((unused)) void * args ) { |
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| 266 | sigset_t mask; |
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| 267 | sigemptyset( &mask ); |
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| 268 | sigaddset( &mask, SIGALRM ); |
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| 269 | |
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| 270 | if ( pthread_sigmask( SIG_BLOCK, &mask, NULL ) == -1 ) { |
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| 271 | abortf( "internal error, pthread_sigmask" ); |
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[82ff5845] | 272 | } |
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[c81ebf9] | 273 | |
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[cd17862] | 274 | while( true ) { |
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[a0b3e32] | 275 | siginfo_t info; |
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| 276 | int sig = sigwaitinfo( &mask, &info ); |
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[8cb529e] | 277 | assertf(sig == SIGALRM, "Kernel Internal Error, sigwait: Unexpected signal %d (%d : %d)\n", sig, info.si_code, info.si_value.sival_int); |
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| 278 | |
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| 279 | LIB_DEBUG_PRINT_SAFE("Kernel : Caught alarm from %d with %d\n", info.si_code, info.si_value.sival_int ); |
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| 280 | switch( info.si_code ) |
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[a0b3e32] | 281 | { |
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[8cb529e] | 282 | case SI_TIMER: |
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| 283 | case SI_KERNEL: |
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| 284 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption thread tick\n"); |
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| 285 | lock( &systemProcessor->alarm_lock DEBUG_CTX2 ); |
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| 286 | tick_preemption(); |
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| 287 | unlock( &systemProcessor->alarm_lock ); |
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| 288 | break; |
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| 289 | case SI_QUEUE: |
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| 290 | goto EXIT; |
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[cd17862] | 291 | } |
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| 292 | } |
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[a0b3e32] | 293 | |
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[8cb529e] | 294 | EXIT: |
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[a0b3e32] | 295 | LIB_DEBUG_PRINT_SAFE("Kernel : Preemption thread stopping\n"); |
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| 296 | return NULL; |
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[82ff5845] | 297 | } |
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| 298 | |
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| 299 | static void __kernel_sigaction( int sig, void (*handler)(__CFA_SIGPARMS__), int flags ) { |
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| 300 | struct sigaction act; |
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| 301 | |
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| 302 | act.sa_sigaction = (void (*)(int, siginfo_t *, void *))handler; |
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[1c273d0] | 303 | act.sa_flags = flags; |
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| 304 | |
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| 305 | if ( sigaction( sig, &act, NULL ) == -1 ) { |
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| 306 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, |
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| 307 | " __kernel_sigaction( sig:%d, handler:%p, flags:%d ), problem installing signal handler, error(%d) %s.\n", |
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| 308 | sig, handler, flags, errno, strerror( errno ) |
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| 309 | ); |
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| 310 | _exit( EXIT_FAILURE ); |
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| 311 | } |
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| 312 | } |
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| 313 | |
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| 314 | typedef void (*sa_handler_t)(int); |
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| 315 | |
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| 316 | static void __kernel_sigdefault( int sig ) { |
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| 317 | struct sigaction act; |
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| 318 | |
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| 319 | // act.sa_handler = SIG_DFL; |
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| 320 | act.sa_flags = 0; |
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| 321 | sigemptyset( &act.sa_mask ); |
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[82ff5845] | 322 | |
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| 323 | if ( sigaction( sig, &act, NULL ) == -1 ) { |
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[1c273d0] | 324 | LIB_DEBUG_PRINT_BUFFER_DECL( STDERR_FILENO, |
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| 325 | " __kernel_sigdefault( sig:%d ), problem reseting signal handler, error(%d) %s.\n", |
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| 326 | sig, errno, strerror( errno ) |
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| 327 | ); |
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[82ff5845] | 328 | _exit( EXIT_FAILURE ); |
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[1c273d0] | 329 | } |
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| 330 | } |
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| 331 | |
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| 332 | //============================================================================================= |
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| 333 | // Terminating Signals logic |
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| 334 | //============================================================================================= |
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| 335 | |
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| 336 | LIB_DEBUG_DO( |
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| 337 | static void __kernel_backtrace( int start ) { |
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| 338 | // skip first N stack frames |
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| 339 | |
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| 340 | enum { Frames = 50 }; |
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| 341 | void * array[Frames]; |
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| 342 | int size = backtrace( array, Frames ); |
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| 343 | char ** messages = backtrace_symbols( array, size ); |
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| 344 | |
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| 345 | // find executable name |
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| 346 | *index( messages[0], '(' ) = '\0'; |
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| 347 | #ifdef __USE_STREAM__ |
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| 348 | serr | "Stack back trace for:" | messages[0] | endl; |
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| 349 | #else |
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| 350 | fprintf( stderr, "Stack back trace for: %s\n", messages[0]); |
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| 351 | #endif |
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| 352 | |
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| 353 | // skip last 2 stack frames after main |
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| 354 | for ( int i = start; i < size && messages != NULL; i += 1 ) { |
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| 355 | char * name = NULL; |
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| 356 | char * offset_begin = NULL; |
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| 357 | char * offset_end = NULL; |
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| 358 | |
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| 359 | for ( char *p = messages[i]; *p; ++p ) { |
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| 360 | // find parantheses and +offset |
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| 361 | if ( *p == '(' ) { |
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| 362 | name = p; |
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| 363 | } |
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| 364 | else if ( *p == '+' ) { |
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| 365 | offset_begin = p; |
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| 366 | } |
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| 367 | else if ( *p == ')' ) { |
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| 368 | offset_end = p; |
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| 369 | break; |
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| 370 | } |
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| 371 | } |
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| 372 | |
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| 373 | // if line contains symbol print it |
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| 374 | int frameNo = i - start; |
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| 375 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
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| 376 | // delimit strings |
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| 377 | *name++ = '\0'; |
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| 378 | *offset_begin++ = '\0'; |
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| 379 | *offset_end++ = '\0'; |
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| 380 | |
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| 381 | #ifdef __USE_STREAM__ |
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| 382 | serr | "(" | frameNo | ")" | messages[i] | ":" |
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| 383 | | name | "+" | offset_begin | offset_end | endl; |
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| 384 | #else |
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| 385 | fprintf( stderr, "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end); |
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| 386 | #endif |
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| 387 | } |
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| 388 | // otherwise, print the whole line |
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| 389 | else { |
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| 390 | #ifdef __USE_STREAM__ |
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| 391 | serr | "(" | frameNo | ")" | messages[i] | endl; |
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| 392 | #else |
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| 393 | fprintf( stderr, "(%i) %s\n", frameNo, messages[i] ); |
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| 394 | #endif |
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| 395 | } |
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| 396 | } |
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| 397 | |
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| 398 | free( messages ); |
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| 399 | } |
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| 400 | ) |
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| 401 | |
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[f2b12406] | 402 | // void sigHandler_segv( __CFA_SIGPARMS__ ) { |
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| 403 | // LIB_DEBUG_DO( |
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| 404 | // #ifdef __USE_STREAM__ |
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| 405 | // serr | "*CFA runtime error* program cfa-cpp terminated with" |
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| 406 | // | (sig == SIGSEGV ? "segment fault." : "bus error.") |
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| 407 | // | endl; |
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| 408 | // #else |
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| 409 | // fprintf( stderr, "*CFA runtime error* program cfa-cpp terminated with %s\n", sig == SIGSEGV ? "segment fault." : "bus error." ); |
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| 410 | // #endif |
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| 411 | |
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| 412 | // // skip first 2 stack frames |
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| 413 | // __kernel_backtrace( 1 ); |
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| 414 | // ) |
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| 415 | // exit( EXIT_FAILURE ); |
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| 416 | // } |
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[1c273d0] | 417 | |
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| 418 | // void sigHandler_abort( __CFA_SIGPARMS__ ) { |
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| 419 | // // skip first 6 stack frames |
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| 420 | // LIB_DEBUG_DO( __kernel_backtrace( 6 ); ) |
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| 421 | |
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| 422 | // // reset default signal handler |
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| 423 | // __kernel_sigdefault( SIGABRT ); |
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| 424 | |
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| 425 | // raise( SIGABRT ); |
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| 426 | // } |
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