| [724] | 1 | /******************************************************************************** |
|---|
| 2 | * File : giet.S |
|---|
| 3 | * Author : Alain Greiner |
|---|
| 4 | * Date : 15/01/2014 |
|---|
| 5 | ********************************************************************************* |
|---|
| 6 | * This is a very simple Interrupts/Exception/Traps handler for a generic |
|---|
| 7 | * multi-clusters / multi-processors TSAR architecture (up to 256 clusters, |
|---|
| 8 | * up to 4 processors per cluster). |
|---|
| 9 | * The physical address is 40 bits, and the 8 MSB bits A[39:32] define the |
|---|
| 10 | * cluster index. |
|---|
| 11 | ********************************************************************************/ |
|---|
| 12 | |
|---|
| 13 | #include "hard_config.h" |
|---|
| 14 | |
|---|
| 15 | .section .giet,"ax",@progbits |
|---|
| 16 | .align 2 |
|---|
| 17 | .global _interrupt_vector |
|---|
| 18 | |
|---|
| 19 | .extern seg_xcu_base |
|---|
| 20 | .extern seg_tty_base |
|---|
| 21 | |
|---|
| 22 | .extern _procid |
|---|
| 23 | .extern _proctime |
|---|
| 24 | .extern _tty_write |
|---|
| 25 | .extern _tty_read |
|---|
| 26 | .extern _tty_read_irq |
|---|
| 27 | .extern _locks_read |
|---|
| 28 | .extern _locks_write |
|---|
| 29 | .extern _exit |
|---|
| 30 | .extern _fb_sync_write |
|---|
| 31 | .extern _fb_sync_read |
|---|
| 32 | .extern _ioc_write |
|---|
| 33 | .extern _ioc_read |
|---|
| 34 | .extern _ioc_completed |
|---|
| 35 | .extern _itoa_hex |
|---|
| 36 | .extern _barrier_init |
|---|
| 37 | .extern _barrier_wait |
|---|
| 38 | |
|---|
| 39 | .ent _giet |
|---|
| 40 | |
|---|
| 41 | /**************************************************************** |
|---|
| 42 | * Cause Table (indexed by the Cause register) |
|---|
| 43 | ****************************************************************/ |
|---|
| 44 | tab_causes: |
|---|
| 45 | .word _int_handler /* 0000 : external interrupt */ |
|---|
| 46 | .word _cause_ukn /* 0001 : undefined exception */ |
|---|
| 47 | .word _cause_ukn /* 0010 : undefined exception */ |
|---|
| 48 | .word _cause_ukn /* 0011 : undefined exception */ |
|---|
| 49 | .word _cause_adel /* 0100 : illegal address read exception */ |
|---|
| 50 | .word _cause_ades /* 0101 : illegal address write exception */ |
|---|
| 51 | .word _cause_ibe /* 0110 : instruction bus error exception */ |
|---|
| 52 | .word _cause_dbe /* 0111 : data bus error exception */ |
|---|
| 53 | .word _sys_handler /* 1000 : system call */ |
|---|
| 54 | .word _cause_bp /* 1001 : breakpoint exception */ |
|---|
| 55 | .word _cause_ri /* 1010 : illegal codop exception */ |
|---|
| 56 | .word _cause_cpu /* 1011 : illegal coprocessor access */ |
|---|
| 57 | .word _cause_ovf /* 1100 : arithmetic overflow exception */ |
|---|
| 58 | .word _cause_ukn /* 1101 : undefined exception */ |
|---|
| 59 | .word _cause_ukn /* 1110 : undefined exception */ |
|---|
| 60 | .word _cause_ukn /* 1111 : undefined exception */ |
|---|
| 61 | |
|---|
| 62 | .space 320 |
|---|
| 63 | |
|---|
| 64 | /**************************************************************** |
|---|
| 65 | * Entry point (base + 0x180) |
|---|
| 66 | ****************************************************************/ |
|---|
| 67 | _giet: |
|---|
| 68 | mfc0 $27, $13 /* Cause Register analysis */ |
|---|
| 69 | la $26, seg_kcode_base /* $26 <= tab_causes */ |
|---|
| 70 | andi $27, $27, 0x3c |
|---|
| 71 | addu $26, $26, $27 /* $26 <= &tab_causes[XCODE] */ |
|---|
| 72 | lw $26, ($26) |
|---|
| 73 | jr $26 /* Jump to tab_causes[XCODE] */ |
|---|
| 74 | |
|---|
| 75 | .end _giet |
|---|
| 76 | |
|---|
| 77 | /**************************************************************** |
|---|
| 78 | * System Call Handler |
|---|
| 79 | * |
|---|
| 80 | * As the GIET_TSAR does not support system calls, |
|---|
| 81 | * an error message is displayed on TTY0, the program is killed. |
|---|
| 82 | ****************************************************************/ |
|---|
| 83 | .ent _sys_handler |
|---|
| 84 | |
|---|
| 85 | _sys_handler: |
|---|
| 86 | la $4, _msg_uknsyscall /* $4 <= message address */ |
|---|
| 87 | li $5, 36 /* $5 <= message length */ |
|---|
| 88 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 89 | jal _tty_write /* print unknown message */ |
|---|
| 90 | nop |
|---|
| 91 | |
|---|
| 92 | la $4, _msg_epc /* $4 <= message address */ |
|---|
| 93 | li $5, 8 /* $5 <= message length */ |
|---|
| 94 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 95 | jal _tty_write /* print EPC message */ |
|---|
| 96 | nop |
|---|
| 97 | |
|---|
| 98 | mfc0 $4, $14 /* $4 <= EPC */ |
|---|
| 99 | la $5, _itoa_buffer /* $5 <= buffer address */ |
|---|
| 100 | addiu $5, $5, 2 /* skip the 0x prefix */ |
|---|
| 101 | jal _itoa_hex /* fill the buffer */ |
|---|
| 102 | nop |
|---|
| 103 | |
|---|
| 104 | la $4, _itoa_buffer /* $4 <= buffer address */ |
|---|
| 105 | li $5, 10 /* $5 <= buffer length */ |
|---|
| 106 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 107 | jal _tty_write /* print EPC value */ |
|---|
| 108 | nop |
|---|
| 109 | |
|---|
| 110 | j _exit /* end of program */ |
|---|
| 111 | |
|---|
| 112 | _itoa_buffer: .ascii "0x00000000" |
|---|
| 113 | |
|---|
| 114 | .align 2 |
|---|
| 115 | |
|---|
| 116 | .end _sys_handler |
|---|
| 117 | |
|---|
| 118 | /**************************************************************** |
|---|
| 119 | * Interrupt Handler |
|---|
| 120 | * This simple interrupt handler cannot be interrupted. |
|---|
| 121 | * It uses the SoCLib VCI_XICU component. |
|---|
| 122 | * It makes the assumption that there is only one interrupt per |
|---|
| 123 | * entry in the interrupt vector (it can be PTI, HWI, or WTI). |
|---|
| 124 | * In case of a multi-clusters architecture, it exist one XCU |
|---|
| 125 | * per cluster, and the base address of the ICU segment depends |
|---|
| 126 | * on both the cluster_xy and the proc_id: |
|---|
| 127 | * - base_address = seg_xcu_base + (32*local_id) + (4G*cluster_xy) |
|---|
| 128 | * - cluster_xy = proc_id / NB_PROCS_MAX |
|---|
| 129 | * - local_id = proc_id % NB_PROCS_MAX |
|---|
| 130 | * If no active interrupt is found in the PRIO register, |
|---|
| 131 | * nothing is done. |
|---|
| 132 | * The interrupt vector (32 ISR addresses array stored at |
|---|
| 133 | * _interrupt_vector address) is initialised with the default |
|---|
| 134 | * ISR address. The actual ISR addresses are supposed to be written |
|---|
| 135 | * in the interrupt vector array by the boot code. |
|---|
| 136 | * All non persistant registers, such as $1 to $15, and $24 to $25, |
|---|
| 137 | * as well as register $31 and EPC, are saved in the interrupted |
|---|
| 138 | * program stack, before calling the Interrupt Service Routine. |
|---|
| 139 | * These registers can be used by the ISR code. |
|---|
| 140 | ***************************************************************/ |
|---|
| 141 | .ent _int_handler |
|---|
| 142 | |
|---|
| 143 | _int_handler: |
|---|
| 144 | addiu $29, $29, -23*4 /* stack space reservation */ |
|---|
| 145 | .set noat |
|---|
| 146 | sw $1, 4*4($29) /* save $1 */ |
|---|
| 147 | .set at |
|---|
| 148 | sw $2, 4*5($29) /* save $2 */ |
|---|
| 149 | sw $3, 4*6($29) /* save $3 */ |
|---|
| 150 | sw $4, 4*7($29) /* save $4 */ |
|---|
| 151 | sw $5, 4*8($29) /* save $5 */ |
|---|
| 152 | sw $6, 4*9($29) /* save $6 */ |
|---|
| 153 | sw $7, 4*10($29) /* save $7 */ |
|---|
| 154 | sw $8, 4*11($29) /* save $8 */ |
|---|
| 155 | sw $9, 4*12($29) /* save $9 */ |
|---|
| 156 | sw $10, 4*13($29) /* save $10 */ |
|---|
| 157 | sw $11, 4*14($29) /* save $11 */ |
|---|
| 158 | sw $12, 4*15($29) /* save $12 */ |
|---|
| 159 | sw $13, 4*16($29) /* save $13 */ |
|---|
| 160 | sw $14, 4*17($29) /* save $14 */ |
|---|
| 161 | sw $15, 4*18($29) /* save $15 */ |
|---|
| 162 | sw $24, 4*19($29) /* save $24 */ |
|---|
| 163 | sw $25, 4*20($29) /* save $25 */ |
|---|
| 164 | sw $31, 4*21($29) /* save $31 */ |
|---|
| 165 | mfc0 $27, $14 |
|---|
| 166 | sw $27, 4*22($29) /* save EPC */ |
|---|
| 167 | |
|---|
| 168 | /* XICU PRIO register address computation */ |
|---|
| 169 | /* It depends on both the cluster_xy & local_id, */ |
|---|
| 170 | /* and we must use the physical address extension */ |
|---|
| 171 | mfc0 $10, $15, 1 /* $10 <= proc_id */ |
|---|
| 172 | andi $10, $10, 0x3FF /* at most 1024 processors */ |
|---|
| 173 | li $11, NB_PROCS_MAX |
|---|
| 174 | divu $10, $11 |
|---|
| 175 | mflo $12 /* $12 <= cluster_xy */ |
|---|
| 176 | mfhi $13 /* $13 <= local_id */ |
|---|
| 177 | la $14, seg_xcu_base /* $14 <= seg_xcu_base */ |
|---|
| 178 | |
|---|
| 179 | li $7, 0b011110000000 /* $7 <= PRIO offset */ |
|---|
| 180 | sll $8, $13, 2 /* $8 <= local_id*4 */ |
|---|
| 181 | addu $9, $7, $8 /* $9 <= PRIO offset + local_id*4 */ |
|---|
| 182 | addu $26, $9, $14 /* $26 <= seg_icu_base + PRIO offset + local_id*4 */ |
|---|
| 183 | |
|---|
| 184 | /* XCU[cluster_xy] access to get PRIO register value */ |
|---|
| 185 | mtc2 $12, $24 /* set PADDR extension */ |
|---|
| 186 | lw $15, ($26) /* $15 <= PRIO register value */ |
|---|
| 187 | mtc2 $0, $24 /* reset PADDR extension */ |
|---|
| 188 | |
|---|
| 189 | /* test PTI, then HWI, then WTI */ |
|---|
| 190 | andi $27, $15, 0x1 /* test bit T in PRIO register */ |
|---|
| 191 | bne $27, $0, _int_PTI /* branch to PTI handler */ |
|---|
| 192 | andi $27, $15, 0x2 /* test bit W in PRIO register */ |
|---|
| 193 | bne $27, $0, _int_HWI /* branch to HWI handler */ |
|---|
| 194 | andi $27, $15, 0x4 /* test bit W in PRIO register */ |
|---|
| 195 | bne $27, $0, _int_WTI /* branch to WTI handler */ |
|---|
| 196 | |
|---|
| 197 | /* exit interrupt handler: restore registers */ |
|---|
| 198 | _int_restore: |
|---|
| 199 | .set noat |
|---|
| 200 | lw $1, 4*4($29) |
|---|
| 201 | .set at |
|---|
| 202 | lw $2, 4*5($29) |
|---|
| 203 | lw $3, 4*6($29) |
|---|
| 204 | lw $4, 4*7($29) |
|---|
| 205 | lw $5, 4*8($29) |
|---|
| 206 | lw $6, 4*9($29) |
|---|
| 207 | lw $7, 4*10($29) |
|---|
| 208 | lw $8, 4*11($29) |
|---|
| 209 | lw $9, 4*12($29) |
|---|
| 210 | lw $10, 4*13($29) |
|---|
| 211 | lw $11, 4*14($29) |
|---|
| 212 | lw $12, 4*15($29) |
|---|
| 213 | lw $13, 4*16($29) |
|---|
| 214 | lw $14, 4*17($29) |
|---|
| 215 | lw $15, 4*18($29) |
|---|
| 216 | lw $24, 4*19($29) |
|---|
| 217 | lw $25, 4*20($29) |
|---|
| 218 | lw $31, 4*21($29) |
|---|
| 219 | lw $27, 4*22($29) /* get EPC */ |
|---|
| 220 | addiu $29, $29, 23*4 /* restore SP */ |
|---|
| 221 | mtc0 $27, $14 /* restore EPC */ |
|---|
| 222 | eret /* exit GIET */ |
|---|
| 223 | |
|---|
| 224 | /* The PTI handler get PTI index, */ |
|---|
| 225 | /* acknowledge the PTI register */ |
|---|
| 226 | /* and call the corresponding ISR */ |
|---|
| 227 | _int_PTI: |
|---|
| 228 | srl $26, $15, 6 /* $26 <= PRIO >> 6 */ |
|---|
| 229 | andi $26, $26, 0x7C /* $26 <= PTI_INDEX * 4 */ |
|---|
| 230 | addi $27, $14, 0x180 /* $27 <= &PTI_ACK[0] */ |
|---|
| 231 | add $27, $27, $26 /* $27 <= &PTI_ACK[PTI_INDEX] */ |
|---|
| 232 | lw $0, ($27) /* acknowledge XICU PTI */ |
|---|
| 233 | la $27, _interrupt_vector |
|---|
| 234 | addu $26, $26, $27 |
|---|
| 235 | lw $26, ($26) /* read ISR address */ |
|---|
| 236 | jalr $26 /* call ISR */ |
|---|
| 237 | nop |
|---|
| 238 | j _int_restore /* return from INT handler */ |
|---|
| 239 | nop |
|---|
| 240 | |
|---|
| 241 | /* The HWI handler get HWI index */ |
|---|
| 242 | /* and call the corresponding ISR */ |
|---|
| 243 | _int_HWI: |
|---|
| 244 | srl $26, $15, 14 /* $26 <= PRIO >> 14 */ |
|---|
| 245 | andi $26, $26, 0x7C /* $26 <= HWI_INDEX * 4 */ |
|---|
| 246 | la $27, _interrupt_vector |
|---|
| 247 | addu $26, $26, $27 /* $26 <= &ISR[HWI_INDEX */ |
|---|
| 248 | lw $26, ($26) /* read ISR address */ |
|---|
| 249 | jalr $26 /* call ISR */ |
|---|
| 250 | nop |
|---|
| 251 | j _int_restore /* return from INT handler */ |
|---|
| 252 | nop |
|---|
| 253 | |
|---|
| 254 | /* The WTI handler get WTI index, */ |
|---|
| 255 | /* acknowledge the WTI register */ |
|---|
| 256 | /* and call the corresponding ISR */ |
|---|
| 257 | _int_WTI: |
|---|
| 258 | srl $26, $15, 22 /* $26 <= PRIO >> 22 */ |
|---|
| 259 | andi $26, $26, 0x7C /* $26 <= WTI_INDEX * 4 */ |
|---|
| 260 | add $27, $14, $26 /* $27 <= &WTI_REG[WTI_INDEX] */ |
|---|
| 261 | lw $0, ($27) /* acknowledge XICU WTI */ |
|---|
| 262 | la $27, _interrupt_vector |
|---|
| 263 | addu $26, $26, $27 /* $26 <= &ISR[WTI_INDEX] */ |
|---|
| 264 | lw $26, ($26) /* read ISR address */ |
|---|
| 265 | jalr $26 /* call ISR */ |
|---|
| 266 | nop |
|---|
| 267 | j _int_restore /* return from INT handler */ |
|---|
| 268 | nop |
|---|
| 269 | |
|---|
| 270 | /* The default ISR is called when no specific ISR has been installed */ |
|---|
| 271 | /* in the interrupt vector. It simply displays a message on TTY0 */ |
|---|
| 272 | |
|---|
| 273 | isr_default: |
|---|
| 274 | addiu $29, $29, -20 /* get space in stack */ |
|---|
| 275 | sw $31, 16($29) /* to save the return address */ |
|---|
| 276 | la $4, _msg_default /* $4 <= string address */ |
|---|
| 277 | addi $5, $0, 36 /* $5 <= string length */ |
|---|
| 278 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 279 | jal _tty_write |
|---|
| 280 | lw $31, 16($29) /* restore return address */ |
|---|
| 281 | addiu $29, $29, 20 /* free space */ |
|---|
| 282 | jr $31 /* returns to interrupt handler */ |
|---|
| 283 | |
|---|
| 284 | /**************************************************************** |
|---|
| 285 | * Interrupt Vector Table (indexed by interrupt index) |
|---|
| 286 | * 32 words corresponding to 32 ISR addresses |
|---|
| 287 | ****************************************************************/ |
|---|
| 288 | _interrupt_vector: |
|---|
| 289 | .word isr_default /* ISR 0 */ |
|---|
| 290 | .word isr_default /* ISR 1 */ |
|---|
| 291 | .word isr_default /* ISR 2 */ |
|---|
| 292 | .word isr_default /* ISR 3 */ |
|---|
| 293 | .word isr_default /* ISR 4 */ |
|---|
| 294 | .word isr_default /* ISR 5 */ |
|---|
| 295 | .word isr_default /* ISR 6 */ |
|---|
| 296 | .word isr_default /* ISR 7 */ |
|---|
| 297 | .word isr_default /* ISR 8 */ |
|---|
| 298 | .word isr_default /* ISR 9 */ |
|---|
| 299 | .word isr_default /* ISR 10 */ |
|---|
| 300 | .word isr_default /* ISR 11 */ |
|---|
| 301 | .word isr_default /* ISR 12 */ |
|---|
| 302 | .word isr_default /* ISR 13 */ |
|---|
| 303 | .word isr_default /* ISR 14 */ |
|---|
| 304 | .word isr_default /* ISR 15 */ |
|---|
| 305 | .word isr_default /* ISR 16 */ |
|---|
| 306 | .word isr_default /* ISR 17 */ |
|---|
| 307 | .word isr_default /* ISR 18 */ |
|---|
| 308 | .word isr_default /* ISR 19 */ |
|---|
| 309 | .word isr_default /* ISR 20 */ |
|---|
| 310 | .word isr_default /* ISR 21 */ |
|---|
| 311 | .word isr_default /* ISR 22 */ |
|---|
| 312 | .word isr_default /* ISR 23 */ |
|---|
| 313 | .word isr_default /* ISR 24 */ |
|---|
| 314 | .word isr_default /* ISR 25 */ |
|---|
| 315 | .word isr_default /* ISR 26 */ |
|---|
| 316 | .word isr_default /* ISR 27 */ |
|---|
| 317 | .word isr_default /* ISR 28 */ |
|---|
| 318 | .word isr_default /* ISR 29 */ |
|---|
| 319 | .word isr_default /* ISR 30 */ |
|---|
| 320 | .word isr_default /* ISR 31 */ |
|---|
| 321 | |
|---|
| 322 | .end _int_handler |
|---|
| 323 | |
|---|
| 324 | /**************************************************************** |
|---|
| 325 | * Exception Handler |
|---|
| 326 | * Same code for all fatal exceptions : |
|---|
| 327 | * Print the exception type and the values of EPC & BAR |
|---|
| 328 | * on the TTY correspondintg to the processor PROCID, |
|---|
| 329 | * and the user program is killed. |
|---|
| 330 | ****************************************************************/ |
|---|
| 331 | .ent _exc_handler |
|---|
| 332 | |
|---|
| 333 | _exc_handler: |
|---|
| 334 | _cause_bp: |
|---|
| 335 | _cause_ukn: |
|---|
| 336 | _cause_ri: |
|---|
| 337 | _cause_ovf: |
|---|
| 338 | _cause_adel: |
|---|
| 339 | _cause_ades: |
|---|
| 340 | _cause_ibe: |
|---|
| 341 | _cause_dbe: |
|---|
| 342 | _cause_cpu: |
|---|
| 343 | mfc0 $26, $13 /* $26 <= CR */ |
|---|
| 344 | andi $26, $26, 0x3C /* $26 <= _cause_index * 4 */ |
|---|
| 345 | la $27, _mess_causes /* mess_cause table base address */ |
|---|
| 346 | addu $27, $26, $27 /* $26 <= message base address */ |
|---|
| 347 | |
|---|
| 348 | /* take the lock on TTY0 */ |
|---|
| 349 | li $4, 0 |
|---|
| 350 | jal _tty_get_lock |
|---|
| 351 | nop |
|---|
| 352 | |
|---|
| 353 | /* display exception type */ |
|---|
| 354 | lw $4, ($27) /* $4 <= message address */ |
|---|
| 355 | li $5, 36 /* $5 <= message length */ |
|---|
| 356 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 357 | jal _tty_write |
|---|
| 358 | nop |
|---|
| 359 | |
|---|
| 360 | /* display EPC value */ |
|---|
| 361 | la $4, _msg_epc /* $4 <= message address */ |
|---|
| 362 | li $5, 8 /* $5 <= message length */ |
|---|
| 363 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 364 | jal _tty_write |
|---|
| 365 | nop |
|---|
| 366 | |
|---|
| 367 | mfc0 $4, $14 /* $4 <= EPC value */ |
|---|
| 368 | la $5, _itoa_buffer /* $5 <= buffer address */ |
|---|
| 369 | addiu $5, $5, 2 /* skip 0x prefix */ |
|---|
| 370 | jal _itoa_hex /* fill buffer */ |
|---|
| 371 | nop |
|---|
| 372 | |
|---|
| 373 | la $4, _itoa_buffer /* $4 <= buffer address */ |
|---|
| 374 | li $5, 10 /* $5 <= buffer length */ |
|---|
| 375 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 376 | jal _tty_write |
|---|
| 377 | nop |
|---|
| 378 | |
|---|
| 379 | /* display BAR value */ |
|---|
| 380 | la $4, _msg_bar /* $4 <= message address */ |
|---|
| 381 | li $5, 8 /* $5 <= message length */ |
|---|
| 382 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 383 | jal _tty_write |
|---|
| 384 | nop |
|---|
| 385 | |
|---|
| 386 | mfc0 $4, $8 /* $4 <= BAR value */ |
|---|
| 387 | la $5, _itoa_buffer /* $5 <= buffer address */ |
|---|
| 388 | addiu $5, $5, 2 /* skip 0x prefix */ |
|---|
| 389 | jal _itoa_hex /* fill buffer */ |
|---|
| 390 | nop |
|---|
| 391 | |
|---|
| 392 | la $4, _itoa_buffer /* $4 <= message address */ |
|---|
| 393 | li $5, 10 /* $5 <= message length */ |
|---|
| 394 | li $6, 0 /* $6 <= TTY0 */ |
|---|
| 395 | jal _tty_write |
|---|
| 396 | nop |
|---|
| 397 | |
|---|
| 398 | |
|---|
| 399 | /* release the lock on TTY0 */ |
|---|
| 400 | li $4, 0 |
|---|
| 401 | jal _tty_get_lock |
|---|
| 402 | nop |
|---|
| 403 | |
|---|
| 404 | j _exit /* kill user program */ |
|---|
| 405 | |
|---|
| 406 | /* Exceptions Messages table (indexed by XCODE) */ |
|---|
| 407 | _mess_causes: |
|---|
| 408 | .word _msg_ukncause |
|---|
| 409 | .word _msg_ukncause |
|---|
| 410 | .word _msg_ukncause |
|---|
| 411 | .word _msg_ukncause |
|---|
| 412 | .word _msg_adel |
|---|
| 413 | .word _msg_ades |
|---|
| 414 | .word _msg_ibe |
|---|
| 415 | .word _msg_dbe |
|---|
| 416 | .word _msg_ukncause |
|---|
| 417 | .word _msg_bp |
|---|
| 418 | .word _msg_ri |
|---|
| 419 | .word _msg_cpu |
|---|
| 420 | .word _msg_ovf |
|---|
| 421 | .word _msg_ukncause |
|---|
| 422 | .word _msg_ukncause |
|---|
| 423 | .word _msg_ukncause |
|---|
| 424 | |
|---|
| 425 | /******************************************************************** |
|---|
| 426 | * All messages |
|---|
| 427 | * Messages length are fixed : 8 or 36 characters... |
|---|
| 428 | ********************************************************************/ |
|---|
| 429 | _msg_bar: .asciiz "\nBAR = " |
|---|
| 430 | _msg_epc: .asciiz "\nEPC = " |
|---|
| 431 | _msg_default: .asciiz "\n\n !!! Default ISR !!! \n" |
|---|
| 432 | _msg_uknsyscall: .asciiz "\n\n !!! Undefined System Call !!! \n" |
|---|
| 433 | _msg_ukncause: .asciiz "\n\nException : strange unknown cause\n" |
|---|
| 434 | _msg_adel: .asciiz "\n\nException : illegal read address \n" |
|---|
| 435 | _msg_ades: .asciiz "\n\nException : illegal write address\n" |
|---|
| 436 | _msg_ibe: .asciiz "\n\nException : inst bus error \n" |
|---|
| 437 | _msg_dbe: .asciiz "\n\nException : data bus error \n" |
|---|
| 438 | _msg_bp: .asciiz "\n\nException : breakpoint \n" |
|---|
| 439 | _msg_ri: .asciiz "\n\nException : reserved instruction \n" |
|---|
| 440 | _msg_ovf: .asciiz "\n\nException : arithmetic overflow \n" |
|---|
| 441 | _msg_cpu: .asciiz "\n\nException : illegal coproc access\n" |
|---|
| 442 | |
|---|
| 443 | .end _exc_handler |
|---|
| 444 | |
|---|
| 445 | |
|---|
