[05df0a8] | 1 | /* |
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| 2 | * Thread Handler |
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| 3 | * |
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| 4 | * |
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[46a67b19] | 5 | * COPYRIGHT (c) 1989-2009. |
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[05df0a8] | 6 | * On-Line Applications Research Corporation (OAR). |
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| 7 | * |
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| 8 | * The license and distribution terms for this file may be |
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[dcf3687] | 9 | * found in the file LICENSE in this distribution or at |
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[dd687d97] | 10 | * http://www.rtems.com/license/LICENSE. |
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[05df0a8] | 11 | * |
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| 12 | * $Id$ |
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| 13 | */ |
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| 14 | |
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[a8eed23] | 15 | #if HAVE_CONFIG_H |
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| 16 | #include "config.h" |
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| 17 | #endif |
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| 18 | |
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[05df0a8] | 19 | #include <rtems/system.h> |
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| 20 | #include <rtems/score/apiext.h> |
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| 21 | #include <rtems/score/context.h> |
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| 22 | #include <rtems/score/interr.h> |
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| 23 | #include <rtems/score/isr.h> |
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| 24 | #include <rtems/score/object.h> |
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| 25 | #include <rtems/score/priority.h> |
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| 26 | #include <rtems/score/states.h> |
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| 27 | #include <rtems/score/sysstate.h> |
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| 28 | #include <rtems/score/thread.h> |
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| 29 | #include <rtems/score/threadq.h> |
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| 30 | #include <rtems/score/userext.h> |
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| 31 | #include <rtems/score/wkspace.h> |
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| 32 | |
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[bd59b348] | 33 | #if defined(__AVR__) |
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| 34 | #undef __USE_INIT_FINI__ |
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[42fce5d3] | 35 | #endif |
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| 36 | |
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[f73fc29] | 37 | #if defined(__USE_INIT_FINI__) |
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[d104778] | 38 | #if defined(__M32R__) |
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| 39 | #define INIT_NAME __init |
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| 40 | #else |
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| 41 | #define INIT_NAME _init |
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| 42 | #endif |
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| 43 | |
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| 44 | extern void INIT_NAME(void); |
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[46a67b19] | 45 | #define EXECUTE_GLOBAL_CONSTRUCTORS |
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[f73fc29] | 46 | #endif |
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[46a67b19] | 47 | |
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[f73fc29] | 48 | #if defined(__USE__MAIN__) |
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| 49 | extern void _main(void); |
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[46a67b19] | 50 | #define INIT_NAME __main |
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| 51 | #define EXECUTE_GLOBAL_CONSTRUCTORS |
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[f73fc29] | 52 | #endif |
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| 53 | |
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[05df0a8] | 54 | /*PAGE |
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| 55 | * |
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| 56 | * _Thread_Handler |
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| 57 | * |
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| 58 | * This routine is the "primal" entry point for all threads. |
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| 59 | * _Context_Initialize() dummies up the thread's initial context |
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| 60 | * to cause the first Context_Switch() to jump to _Thread_Handler(). |
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| 61 | * |
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| 62 | * This routine is the default thread exitted error handler. It is |
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| 63 | * returned to when a thread exits. The configured fatal error handler |
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| 64 | * is invoked to process the exit. |
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| 65 | * |
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| 66 | * NOTE: |
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| 67 | * |
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| 68 | * On entry, it is assumed all interrupts are blocked and that this |
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[a0ed4ed] | 69 | * routine needs to set the initial isr level. This may or may not |
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[05df0a8] | 70 | * actually be needed by the context switch routine and as a result |
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| 71 | * interrupts may already be at there proper level. Either way, |
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| 72 | * setting the initial isr level properly here is safe. |
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[a0ed4ed] | 73 | * |
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[05df0a8] | 74 | * Input parameters: NONE |
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| 75 | * |
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| 76 | * Output parameters: NONE |
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| 77 | */ |
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| 78 | |
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| 79 | void _Thread_Handler( void ) |
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| 80 | { |
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| 81 | ISR_Level level; |
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| 82 | Thread_Control *executing; |
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[46a67b19] | 83 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
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| 84 | static char doneConstructors; |
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| 85 | char doneCons; |
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| 86 | #endif |
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[05279b84] | 87 | |
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[05df0a8] | 88 | executing = _Thread_Executing; |
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[05279b84] | 89 | |
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[48816d7] | 90 | /* |
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[28352fae] | 91 | * Some CPUs need to tinker with the call frame or registers when the |
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[48816d7] | 92 | * thread actually begins to execute for the first time. This is a |
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| 93 | * hook point where the port gets a shot at doing whatever it requires. |
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| 94 | */ |
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| 95 | _Context_Initialization_at_thread_begin(); |
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| 96 | |
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[05df0a8] | 97 | /* |
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| 98 | * have to put level into a register for those cpu's that use |
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| 99 | * inline asm here |
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| 100 | */ |
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[05279b84] | 101 | |
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[05df0a8] | 102 | level = executing->Start.isr_level; |
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| 103 | _ISR_Set_level(level); |
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| 104 | |
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[46a67b19] | 105 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
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| 106 | doneCons = doneConstructors; |
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| 107 | doneConstructors = 1; |
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| 108 | #endif |
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[5b87515d] | 109 | |
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[46a67b19] | 110 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
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| 111 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
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| 112 | if ( (executing->fp_context != NULL) && |
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| 113 | !_Thread_Is_allocated_fp( executing ) ) { |
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| 114 | if ( _Thread_Allocated_fp != NULL ) |
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| 115 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
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| 116 | _Thread_Allocated_fp = executing; |
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| 117 | } |
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| 118 | #endif |
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| 119 | #endif |
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[48f89683] | 120 | |
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[05df0a8] | 121 | /* |
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| 122 | * Take care that 'begin' extensions get to complete before |
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| 123 | * 'switch' extensions can run. This means must keep dispatch |
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| 124 | * disabled until all 'begin' extensions complete. |
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| 125 | */ |
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| 126 | _User_extensions_Thread_begin( executing ); |
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[05279b84] | 127 | |
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[05df0a8] | 128 | /* |
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| 129 | * At this point, the dispatch disable level BETTER be 1. |
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| 130 | */ |
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| 131 | _Thread_Enable_dispatch(); |
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[94ab166] | 132 | |
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[46a67b19] | 133 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
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| 134 | /* |
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| 135 | * _init could be a weak symbol and we SHOULD test it but it isn't |
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| 136 | * in any configuration I know of and it generates a warning on every |
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| 137 | * RTEMS target configuration. --joel (12 May 2007) |
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| 138 | */ |
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| 139 | if (!doneCons) /* && (volatile void *)_init) */ { |
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| 140 | INIT_NAME (); |
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| 141 | } |
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| 142 | #endif |
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| 143 | |
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| 144 | if ( executing->Start.prototype == THREAD_START_NUMERIC ) { |
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| 145 | executing->Wait.return_argument = |
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| 146 | (*(Thread_Entry_numeric) executing->Start.entry_point)( |
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| 147 | executing->Start.numeric_argument |
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[05df0a8] | 148 | ); |
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[46a67b19] | 149 | } |
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[442eac69] | 150 | #if defined(RTEMS_POSIX_API) |
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| 151 | else if ( executing->Start.prototype == THREAD_START_POINTER ) { |
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| 152 | executing->Wait.return_argument = |
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| 153 | (*(Thread_Entry_pointer) executing->Start.entry_point)( |
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| 154 | executing->Start.pointer_argument |
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| 155 | ); |
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| 156 | } |
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| 157 | #endif |
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[46a67b19] | 158 | #if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API) |
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| 159 | else if ( executing->Start.prototype == THREAD_START_BOTH_POINTER_FIRST ) { |
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[a0ed4ed] | 160 | executing->Wait.return_argument = |
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| 161 | (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( |
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[260b0c2] | 162 | executing->Start.pointer_argument, |
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| 163 | executing->Start.numeric_argument |
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| 164 | ); |
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[46a67b19] | 165 | } |
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| 166 | else if ( executing->Start.prototype == THREAD_START_BOTH_NUMERIC_FIRST ) { |
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[a0ed4ed] | 167 | executing->Wait.return_argument = |
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[46a67b19] | 168 | (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( |
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| 169 | executing->Start.numeric_argument, |
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| 170 | executing->Start.pointer_argument |
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| 171 | ); |
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| 172 | } |
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| 173 | #endif |
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[05df0a8] | 174 | |
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[260b0c2] | 175 | /* |
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| 176 | * In the switch above, the return code from the user thread body |
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| 177 | * was placed in return_argument. This assumed that if it returned |
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[a0ed4ed] | 178 | * anything (which is not supporting in all APIs), then it would be |
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[260b0c2] | 179 | * able to fit in a (void *). |
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| 180 | */ |
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| 181 | |
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[05df0a8] | 182 | _User_extensions_Thread_exitted( executing ); |
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| 183 | |
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| 184 | _Internal_error_Occurred( |
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| 185 | INTERNAL_ERROR_CORE, |
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[aae7f1a1] | 186 | true, |
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[05df0a8] | 187 | INTERNAL_ERROR_THREAD_EXITTED |
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| 188 | ); |
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| 189 | } |
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