1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Thread Handler |
---|
5 | * @ingroup ScoreThread |
---|
6 | */ |
---|
7 | |
---|
8 | /* |
---|
9 | * COPYRIGHT (c) 1989-2012. |
---|
10 | * On-Line Applications Research Corporation (OAR). |
---|
11 | * |
---|
12 | * The license and distribution terms for this file may be |
---|
13 | * found in the file LICENSE in this distribution or at |
---|
14 | * http://www.rtems.org/license/LICENSE. |
---|
15 | */ |
---|
16 | |
---|
17 | #if HAVE_CONFIG_H |
---|
18 | #include "config.h" |
---|
19 | #endif |
---|
20 | |
---|
21 | #include <rtems/score/threadimpl.h> |
---|
22 | #include <rtems/score/assert.h> |
---|
23 | #include <rtems/score/interr.h> |
---|
24 | #include <rtems/score/isrlevel.h> |
---|
25 | #include <rtems/score/userextimpl.h> |
---|
26 | |
---|
27 | /* |
---|
28 | * Conditional magic to determine what style of C++ constructor |
---|
29 | * initialization this target and compiler version uses. |
---|
30 | */ |
---|
31 | #if defined(__USE_INIT_FINI__) |
---|
32 | #if defined(__M32R__) |
---|
33 | #define INIT_NAME __init |
---|
34 | #elif defined(__ARM_EABI__) |
---|
35 | #define INIT_NAME __libc_init_array |
---|
36 | #else |
---|
37 | #define INIT_NAME _init |
---|
38 | #endif |
---|
39 | |
---|
40 | extern void INIT_NAME(void); |
---|
41 | #define EXECUTE_GLOBAL_CONSTRUCTORS |
---|
42 | #endif |
---|
43 | |
---|
44 | #if defined(__USE__MAIN__) |
---|
45 | extern void __main(void); |
---|
46 | #define INIT_NAME __main |
---|
47 | #define EXECUTE_GLOBAL_CONSTRUCTORS |
---|
48 | #endif |
---|
49 | |
---|
50 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
---|
51 | static bool _Thread_Handler_is_constructor_execution_required( |
---|
52 | Thread_Control *executing |
---|
53 | ) |
---|
54 | { |
---|
55 | static bool doneConstructors; |
---|
56 | bool doCons = false; |
---|
57 | |
---|
58 | #if defined(RTEMS_SMP) |
---|
59 | static SMP_lock_Control constructor_lock = |
---|
60 | SMP_LOCK_INITIALIZER("constructor"); |
---|
61 | |
---|
62 | SMP_lock_Context lock_context; |
---|
63 | |
---|
64 | if ( !doneConstructors ) { |
---|
65 | _SMP_lock_Acquire( &constructor_lock, &lock_context ); |
---|
66 | #endif |
---|
67 | |
---|
68 | #if defined(RTEMS_MULTIPROCESSING) |
---|
69 | doCons = !doneConstructors |
---|
70 | && _Objects_Get_API( executing->Object.id ) != OBJECTS_INTERNAL_API; |
---|
71 | if (doCons) |
---|
72 | doneConstructors = true; |
---|
73 | #else |
---|
74 | (void) executing; |
---|
75 | doCons = !doneConstructors; |
---|
76 | doneConstructors = true; |
---|
77 | #endif |
---|
78 | |
---|
79 | #if defined(RTEMS_SMP) |
---|
80 | _SMP_lock_Release( &constructor_lock, &lock_context ); |
---|
81 | } |
---|
82 | #endif |
---|
83 | |
---|
84 | return doCons; |
---|
85 | } |
---|
86 | #endif |
---|
87 | |
---|
88 | void _Thread_Handler( void ) |
---|
89 | { |
---|
90 | ISR_Level level; |
---|
91 | Thread_Control *executing; |
---|
92 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
---|
93 | bool doCons; |
---|
94 | #endif |
---|
95 | |
---|
96 | executing = _Thread_Executing; |
---|
97 | |
---|
98 | /* |
---|
99 | * Some CPUs need to tinker with the call frame or registers when the |
---|
100 | * thread actually begins to execute for the first time. This is a |
---|
101 | * hook point where the port gets a shot at doing whatever it requires. |
---|
102 | */ |
---|
103 | _Context_Initialization_at_thread_begin(); |
---|
104 | |
---|
105 | #if !defined(RTEMS_SMP) |
---|
106 | /* |
---|
107 | * have to put level into a register for those cpu's that use |
---|
108 | * inline asm here |
---|
109 | */ |
---|
110 | level = executing->Start.isr_level; |
---|
111 | _ISR_Set_level( level ); |
---|
112 | #endif |
---|
113 | |
---|
114 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
---|
115 | doCons = _Thread_Handler_is_constructor_execution_required( executing ); |
---|
116 | #endif |
---|
117 | |
---|
118 | /* |
---|
119 | * Initialize the floating point context because we do not come |
---|
120 | * through _Thread_Dispatch on our first invocation. So the normal |
---|
121 | * code path for performing the FP context switch is not hit. |
---|
122 | */ |
---|
123 | #if ( CPU_HARDWARE_FP == TRUE ) || ( CPU_SOFTWARE_FP == TRUE ) |
---|
124 | #if ( CPU_USE_DEFERRED_FP_SWITCH == TRUE ) |
---|
125 | if ( (executing->fp_context != NULL) && |
---|
126 | !_Thread_Is_allocated_fp( executing ) ) { |
---|
127 | if ( _Thread_Allocated_fp != NULL ) |
---|
128 | _Context_Save_fp( &_Thread_Allocated_fp->fp_context ); |
---|
129 | _Thread_Allocated_fp = executing; |
---|
130 | } |
---|
131 | #endif |
---|
132 | #endif |
---|
133 | |
---|
134 | /* |
---|
135 | * Take care that 'begin' extensions get to complete before |
---|
136 | * 'switch' extensions can run. This means must keep dispatch |
---|
137 | * disabled until all 'begin' extensions complete. |
---|
138 | */ |
---|
139 | _User_extensions_Thread_begin( executing ); |
---|
140 | |
---|
141 | /* |
---|
142 | * At this point, the dispatch disable level BETTER be 1. |
---|
143 | */ |
---|
144 | #if defined(RTEMS_SMP) |
---|
145 | { |
---|
146 | /* |
---|
147 | * On SMP we enter _Thread_Handler() with interrupts disabled and |
---|
148 | * _Thread_Dispatch() obtained the per-CPU lock for us. We have to |
---|
149 | * release it here and set the desired interrupt level of the thread. |
---|
150 | */ |
---|
151 | Per_CPU_Control *cpu_self = _Per_CPU_Get(); |
---|
152 | |
---|
153 | _Assert( cpu_self->thread_dispatch_disable_level == 1 ); |
---|
154 | _Assert( _ISR_Get_level() != 0 ); |
---|
155 | |
---|
156 | _Thread_Debug_set_real_processor( executing, cpu_self ); |
---|
157 | |
---|
158 | cpu_self->thread_dispatch_disable_level = 0; |
---|
159 | _Profiling_Thread_dispatch_enable( cpu_self, 0 ); |
---|
160 | |
---|
161 | level = executing->Start.isr_level; |
---|
162 | _ISR_Set_level( level); |
---|
163 | |
---|
164 | /* |
---|
165 | * The thread dispatch level changed from one to zero. Make sure we lose |
---|
166 | * no thread dispatch necessary update. |
---|
167 | */ |
---|
168 | _Thread_Dispatch(); |
---|
169 | } |
---|
170 | #else |
---|
171 | _Thread_Enable_dispatch(); |
---|
172 | #endif |
---|
173 | |
---|
174 | #if defined(EXECUTE_GLOBAL_CONSTRUCTORS) |
---|
175 | /* |
---|
176 | * _init could be a weak symbol and we SHOULD test it but it isn't |
---|
177 | * in any configuration I know of and it generates a warning on every |
---|
178 | * RTEMS target configuration. --joel (12 May 2007) |
---|
179 | */ |
---|
180 | if (doCons) /* && (volatile void *)_init) */ { |
---|
181 | INIT_NAME (); |
---|
182 | } |
---|
183 | #endif |
---|
184 | |
---|
185 | /* |
---|
186 | * RTEMS supports multiple APIs and each API can define a different |
---|
187 | * thread/task prototype. The following code supports invoking the |
---|
188 | * user thread entry point using the prototype expected. |
---|
189 | */ |
---|
190 | if ( executing->Start.prototype == THREAD_START_NUMERIC ) { |
---|
191 | executing->Wait.return_argument = |
---|
192 | (*(Thread_Entry_numeric) executing->Start.entry_point)( |
---|
193 | executing->Start.numeric_argument |
---|
194 | ); |
---|
195 | } |
---|
196 | #if defined(RTEMS_POSIX_API) |
---|
197 | else if ( executing->Start.prototype == THREAD_START_POINTER ) { |
---|
198 | executing->Wait.return_argument = |
---|
199 | (*(Thread_Entry_pointer) executing->Start.entry_point)( |
---|
200 | executing->Start.pointer_argument |
---|
201 | ); |
---|
202 | } |
---|
203 | #endif |
---|
204 | #if defined(FUNCTIONALITY_NOT_CURRENTLY_USED_BY_ANY_API) |
---|
205 | else if ( executing->Start.prototype == THREAD_START_BOTH_POINTER_FIRST ) { |
---|
206 | executing->Wait.return_argument = |
---|
207 | (*(Thread_Entry_both_pointer_first) executing->Start.entry_point)( |
---|
208 | executing->Start.pointer_argument, |
---|
209 | executing->Start.numeric_argument |
---|
210 | ); |
---|
211 | } |
---|
212 | else if ( executing->Start.prototype == THREAD_START_BOTH_NUMERIC_FIRST ) { |
---|
213 | executing->Wait.return_argument = |
---|
214 | (*(Thread_Entry_both_numeric_first) executing->Start.entry_point)( |
---|
215 | executing->Start.numeric_argument, |
---|
216 | executing->Start.pointer_argument |
---|
217 | ); |
---|
218 | } |
---|
219 | #endif |
---|
220 | |
---|
221 | /* |
---|
222 | * In the switch above, the return code from the user thread body |
---|
223 | * was placed in return_argument. This assumed that if it returned |
---|
224 | * anything (which is not supporting in all APIs), then it would be |
---|
225 | * able to fit in a (void *). |
---|
226 | */ |
---|
227 | |
---|
228 | _User_extensions_Thread_exitted( executing ); |
---|
229 | |
---|
230 | _Terminate( |
---|
231 | INTERNAL_ERROR_CORE, |
---|
232 | true, |
---|
233 | INTERNAL_ERROR_THREAD_EXITTED |
---|
234 | ); |
---|
235 | } |
---|