2 * FreeRTOS SMP Kernel V202110.00
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22 * https://www.FreeRTOS.org
23 * https://github.com/FreeRTOS
28 /* Scheduler includes. */
32 /* Hardware includes. */
33 #include <microblaze_exceptions_i.h>
34 #include <microblaze_exceptions_g.h>
36 /* The Xilinx library defined exception entry point stacks a number of
37 registers. These definitions are offsets from the stack pointer to the various
38 stacked register values. */
39 #define portexR3_STACK_OFFSET 4
40 #define portexR4_STACK_OFFSET 5
41 #define portexR5_STACK_OFFSET 6
42 #define portexR6_STACK_OFFSET 7
43 #define portexR7_STACK_OFFSET 8
44 #define portexR8_STACK_OFFSET 9
45 #define portexR9_STACK_OFFSET 10
46 #define portexR10_STACK_OFFSET 11
47 #define portexR11_STACK_OFFSET 12
48 #define portexR12_STACK_OFFSET 13
49 #define portexR15_STACK_OFFSET 16
50 #define portexR18_STACK_OFFSET 19
51 #define portexMSR_STACK_OFFSET 20
52 #define portexR19_STACK_OFFSET -1
54 /* This is defined to equal the size, in bytes, of the stack frame generated by
55 the Xilinx standard library exception entry point. It is required to determine
56 the stack pointer value prior to the exception being entered. */
57 #define portexASM_HANDLER_STACK_FRAME_SIZE 84UL
59 /* The number of bytes a MicroBlaze instruction consumes. */
60 #define portexINSTRUCTION_SIZE 4
62 /* Exclude this entire file if the MicroBlaze is not configured to handle
63 exceptions, or the application defined configuration constant
64 configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
65 #if ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 )
67 /* This variable is set in the exception entry code, before
68 vPortExceptionHandler is called. */
69 uint32_t *pulStackPointerOnFunctionEntry = NULL;
71 /* This is the structure that is filled with the MicroBlaze context as it
72 existed immediately prior to the exception occurrence. A pointer to this
73 structure is passed into the vApplicationExceptionRegisterDump() callback
74 function, if one is defined. */
75 static xPortRegisterDump xRegisterDump;
77 /* This is the FreeRTOS exception handler that is installed for all exception
78 types. It is called from vPortExceptionHanlderEntry() - which is itself defined
80 void vPortExceptionHandler( void *pvExceptionID );
81 extern void vPortExceptionHandlerEntry( void *pvExceptionID );
83 /*-----------------------------------------------------------*/
85 /* vApplicationExceptionRegisterDump() is a callback function that the
86 application can optionally define to receive a populated xPortRegisterDump
87 structure. If the application chooses not to define a version of
88 vApplicationExceptionRegisterDump() then this weekly defined default
89 implementation will be called instead. */
90 extern void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump ) __attribute__((weak));
91 void vApplicationExceptionRegisterDump( xPortRegisterDump *xRegisterDump )
93 ( void ) xRegisterDump;
100 /*-----------------------------------------------------------*/
102 void vPortExceptionHandler( void *pvExceptionID )
104 extern void *pxCurrentTCB;
106 /* Fill an xPortRegisterDump structure with the MicroBlaze context as it
107 was immediately before the exception occurrence. */
109 /* First fill in the name and handle of the task that was in the Running
110 state when the exception occurred. */
111 xRegisterDump.xCurrentTaskHandle = pxCurrentTCB;
112 xRegisterDump.pcCurrentTaskName = pcTaskGetName( NULL );
114 configASSERT( pulStackPointerOnFunctionEntry );
116 /* Obtain the values of registers that were stacked prior to this function
117 being called, and may have changed since they were stacked. */
118 xRegisterDump.ulR3 = pulStackPointerOnFunctionEntry[ portexR3_STACK_OFFSET ];
119 xRegisterDump.ulR4 = pulStackPointerOnFunctionEntry[ portexR4_STACK_OFFSET ];
120 xRegisterDump.ulR5 = pulStackPointerOnFunctionEntry[ portexR5_STACK_OFFSET ];
121 xRegisterDump.ulR6 = pulStackPointerOnFunctionEntry[ portexR6_STACK_OFFSET ];
122 xRegisterDump.ulR7 = pulStackPointerOnFunctionEntry[ portexR7_STACK_OFFSET ];
123 xRegisterDump.ulR8 = pulStackPointerOnFunctionEntry[ portexR8_STACK_OFFSET ];
124 xRegisterDump.ulR9 = pulStackPointerOnFunctionEntry[ portexR9_STACK_OFFSET ];
125 xRegisterDump.ulR10 = pulStackPointerOnFunctionEntry[ portexR10_STACK_OFFSET ];
126 xRegisterDump.ulR11 = pulStackPointerOnFunctionEntry[ portexR11_STACK_OFFSET ];
127 xRegisterDump.ulR12 = pulStackPointerOnFunctionEntry[ portexR12_STACK_OFFSET ];
128 xRegisterDump.ulR15_return_address_from_subroutine = pulStackPointerOnFunctionEntry[ portexR15_STACK_OFFSET ];
129 xRegisterDump.ulR18 = pulStackPointerOnFunctionEntry[ portexR18_STACK_OFFSET ];
130 xRegisterDump.ulR19 = pulStackPointerOnFunctionEntry[ portexR19_STACK_OFFSET ];
131 xRegisterDump.ulMSR = pulStackPointerOnFunctionEntry[ portexMSR_STACK_OFFSET ];
133 /* Obtain the value of all other registers. */
134 xRegisterDump.ulR2_small_data_area = mfgpr( R2 );
135 xRegisterDump.ulR13_read_write_small_data_area = mfgpr( R13 );
136 xRegisterDump.ulR14_return_address_from_interrupt = mfgpr( R14 );
137 xRegisterDump.ulR16_return_address_from_trap = mfgpr( R16 );
138 xRegisterDump.ulR17_return_address_from_exceptions = mfgpr( R17 );
139 xRegisterDump.ulR20 = mfgpr( R20 );
140 xRegisterDump.ulR21 = mfgpr( R21 );
141 xRegisterDump.ulR22 = mfgpr( R22 );
142 xRegisterDump.ulR23 = mfgpr( R23 );
143 xRegisterDump.ulR24 = mfgpr( R24 );
144 xRegisterDump.ulR25 = mfgpr( R25 );
145 xRegisterDump.ulR26 = mfgpr( R26 );
146 xRegisterDump.ulR27 = mfgpr( R27 );
147 xRegisterDump.ulR28 = mfgpr( R28 );
148 xRegisterDump.ulR29 = mfgpr( R29 );
149 xRegisterDump.ulR30 = mfgpr( R30 );
150 xRegisterDump.ulR31 = mfgpr( R31 );
151 xRegisterDump.ulR1_SP = ( ( uint32_t ) pulStackPointerOnFunctionEntry ) + portexASM_HANDLER_STACK_FRAME_SIZE;
152 xRegisterDump.ulEAR = mfear();
153 xRegisterDump.ulESR = mfesr();
154 xRegisterDump.ulEDR = mfedr();
156 /* Move the saved program counter back to the instruction that was executed
157 when the exception occurred. This is only valid for certain types of
159 xRegisterDump.ulPC = xRegisterDump.ulR17_return_address_from_exceptions - portexINSTRUCTION_SIZE;
161 #if( XPAR_MICROBLAZE_USE_FPU != 0 )
163 xRegisterDump.ulFSR = mffsr();
167 xRegisterDump.ulFSR = 0UL;
171 /* Also fill in a string that describes what type of exception this is.
172 The string uses the same ID names as defined in the MicroBlaze standard
173 library exception header files. */
174 switch( ( uint32_t ) pvExceptionID )
177 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_FSL";
180 case XEXC_ID_UNALIGNED_ACCESS :
181 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_UNALIGNED_ACCESS";
184 case XEXC_ID_ILLEGAL_OPCODE :
185 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_ILLEGAL_OPCODE";
188 case XEXC_ID_M_AXI_I_EXCEPTION :
189 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_M_AXI_I_EXCEPTION or XEXC_ID_IPLB_EXCEPTION";
192 case XEXC_ID_M_AXI_D_EXCEPTION :
193 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_M_AXI_D_EXCEPTION or XEXC_ID_DPLB_EXCEPTION";
196 case XEXC_ID_DIV_BY_ZERO :
197 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_DIV_BY_ZERO";
200 case XEXC_ID_STACK_VIOLATION :
201 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_STACK_VIOLATION or XEXC_ID_MMU";
204 #if( XPAR_MICROBLAZE_USE_FPU != 0 )
207 xRegisterDump.pcExceptionCause = ( int8_t * const ) "XEXC_ID_FPU see ulFSR value";
210 #endif /* XPAR_MICROBLAZE_USE_FPU */
213 /* vApplicationExceptionRegisterDump() is a callback function that the
214 application can optionally define to receive the populated xPortRegisterDump
215 structure. If the application chooses not to define a version of
216 vApplicationExceptionRegisterDump() then the weekly defined default
217 implementation within this file will be called instead. */
218 vApplicationExceptionRegisterDump( &xRegisterDump );
220 /* Must not attempt to leave this function! */
226 /*-----------------------------------------------------------*/
228 void vPortExceptionsInstallHandlers( void )
230 static uint32_t ulHandlersAlreadyInstalled = pdFALSE;
232 if( ulHandlersAlreadyInstalled == pdFALSE )
234 ulHandlersAlreadyInstalled = pdTRUE;
236 #if XPAR_MICROBLAZE_UNALIGNED_EXCEPTIONS == 1
237 microblaze_register_exception_handler( XEXC_ID_UNALIGNED_ACCESS, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_UNALIGNED_ACCESS );
238 #endif /* XPAR_MICROBLAZE_UNALIGNED_EXCEPTIONS*/
240 #if XPAR_MICROBLAZE_ILL_OPCODE_EXCEPTION == 1
241 microblaze_register_exception_handler( XEXC_ID_ILLEGAL_OPCODE, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_ILLEGAL_OPCODE );
242 #endif /* XPAR_MICROBLAZE_ILL_OPCODE_EXCEPTION */
244 #if XPAR_MICROBLAZE_M_AXI_I_BUS_EXCEPTION == 1
245 microblaze_register_exception_handler( XEXC_ID_M_AXI_I_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_I_EXCEPTION );
246 #endif /* XPAR_MICROBLAZE_M_AXI_I_BUS_EXCEPTION */
248 #if XPAR_MICROBLAZE_M_AXI_D_BUS_EXCEPTION == 1
249 microblaze_register_exception_handler( XEXC_ID_M_AXI_D_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_M_AXI_D_EXCEPTION );
250 #endif /* XPAR_MICROBLAZE_M_AXI_D_BUS_EXCEPTION */
252 #if XPAR_MICROBLAZE_IPLB_BUS_EXCEPTION == 1
253 microblaze_register_exception_handler( XEXC_ID_IPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_IPLB_EXCEPTION );
254 #endif /* XPAR_MICROBLAZE_IPLB_BUS_EXCEPTION */
256 #if XPAR_MICROBLAZE_DPLB_BUS_EXCEPTION == 1
257 microblaze_register_exception_handler( XEXC_ID_DPLB_EXCEPTION, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DPLB_EXCEPTION );
258 #endif /* XPAR_MICROBLAZE_DPLB_BUS_EXCEPTION */
260 #if XPAR_MICROBLAZE_DIV_ZERO_EXCEPTION == 1
261 microblaze_register_exception_handler( XEXC_ID_DIV_BY_ZERO, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_DIV_BY_ZERO );
262 #endif /* XPAR_MICROBLAZE_DIV_ZERO_EXCEPTION */
264 #if XPAR_MICROBLAZE_FPU_EXCEPTION == 1
265 microblaze_register_exception_handler( XEXC_ID_FPU, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FPU );
266 #endif /* XPAR_MICROBLAZE_FPU_EXCEPTION */
268 #if XPAR_MICROBLAZE_FSL_EXCEPTION == 1
269 microblaze_register_exception_handler( XEXC_ID_FSL, vPortExceptionHandlerEntry, ( void * ) XEXC_ID_FSL );
270 #endif /* XPAR_MICROBLAZE_FSL_EXCEPTION */
272 microblaze_enable_exceptions();
276 /* Exclude the entire file if the MicroBlaze is not configured to handle
277 exceptions, or the application defined configuration item
278 configINSTALL_EXCEPTION_HANDLERS is not set to 1. */
279 #endif /* ( MICROBLAZE_EXCEPTIONS_ENABLED == 1 ) && ( configINSTALL_EXCEPTION_HANDLERS == 1 ) */