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6bc9a396 CL |
1 | /* |
2 | * arch/score/kernel/entry.S | |
3 | * | |
4 | * Score Processor version. | |
5 | * | |
6 | * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. | |
7 | * Chen Liqin <liqin.chen@sunplusct.com> | |
8 | * Lennox Wu <lennox.wu@sunplusct.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, see the file COPYING, or write | |
22 | * to the Free Software Foundation, Inc., | |
23 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
24 | */ | |
25 | ||
0402c91a | 26 | #include <linux/err.h> |
6bc9a396 CL |
27 | #include <linux/init.h> |
28 | #include <linux/linkage.h> | |
29 | ||
30 | #include <asm/asmmacro.h> | |
31 | #include <asm/thread_info.h> | |
32 | #include <asm/unistd.h> | |
33 | ||
34 | /* | |
35 | * disable interrupts. | |
36 | */ | |
37 | .macro disable_irq | |
38 | mfcr r8, cr0 | |
39 | srli r8, r8, 1 | |
40 | slli r8, r8, 1 | |
41 | mtcr r8, cr0 | |
42 | nop | |
43 | nop | |
44 | nop | |
45 | nop | |
46 | nop | |
47 | .endm | |
48 | ||
49 | /* | |
50 | * enable interrupts. | |
51 | */ | |
52 | .macro enable_irq | |
53 | mfcr r8, cr0 | |
54 | ori r8, 1 | |
55 | mtcr r8, cr0 | |
56 | nop | |
57 | nop | |
58 | nop | |
59 | nop | |
60 | nop | |
61 | .endm | |
62 | ||
63 | __INIT | |
64 | ENTRY(debug_exception_vector) | |
65 | nop! | |
66 | nop! | |
67 | nop! | |
68 | nop! | |
69 | nop! | |
70 | nop! | |
71 | nop! | |
72 | nop! | |
73 | ||
74 | ENTRY(general_exception_vector) # should move to addr 0x200 | |
75 | j general_exception | |
76 | nop! | |
77 | nop! | |
78 | nop! | |
79 | nop! | |
80 | nop! | |
81 | nop! | |
82 | ||
83 | ENTRY(interrupt_exception_vector) # should move to addr 0x210 | |
84 | j interrupt_exception | |
85 | nop! | |
86 | nop! | |
87 | nop! | |
88 | nop! | |
89 | nop! | |
90 | nop! | |
91 | ||
92 | .section ".text", "ax" | |
93 | .align 2; | |
94 | general_exception: | |
95 | mfcr r31, cr2 | |
96 | nop | |
97 | la r30, exception_handlers | |
98 | andi r31, 0x1f # get ecr.exc_code | |
99 | slli r31, r31, 2 | |
100 | add r30, r30, r31 | |
101 | lw r30, [r30] | |
102 | br r30 | |
103 | ||
104 | interrupt_exception: | |
105 | SAVE_ALL | |
106 | mfcr r4, cr2 | |
107 | nop | |
108 | lw r16, [r28, TI_REGS] | |
109 | sw r0, [r28, TI_REGS] | |
110 | la r3, ret_from_irq | |
111 | srli r4, r4, 18 # get ecr.ip[7:2], interrupt No. | |
112 | mv r5, r0 | |
113 | j do_IRQ | |
114 | ||
115 | ENTRY(handle_nmi) # NMI #1 | |
116 | SAVE_ALL | |
117 | mv r4, r0 | |
118 | la r8, nmi_exception_handler | |
119 | brl r8 | |
120 | j restore_all | |
121 | ||
122 | ENTRY(handle_adelinsn) # AdEL-instruction #2 | |
123 | SAVE_ALL | |
124 | mfcr r8, cr6 | |
125 | nop | |
126 | nop | |
127 | sw r8, [r0, PT_EMA] | |
128 | mv r4, r0 | |
129 | la r8, do_adelinsn | |
130 | brl r8 | |
131 | mv r4, r0 | |
132 | j ret_from_exception | |
133 | nop | |
134 | ||
135 | ENTRY(handle_ibe) # BusEL-instruction #5 | |
136 | SAVE_ALL | |
137 | mv r4, r0 | |
138 | la r8, do_be | |
139 | brl r8 | |
140 | mv r4, r0 | |
141 | j ret_from_exception | |
142 | nop | |
143 | ||
144 | ENTRY(handle_pel) # P-EL #6 | |
145 | SAVE_ALL | |
146 | mv r4, r0 | |
147 | la r8, do_pel | |
148 | brl r8 | |
149 | mv r4, r0 | |
150 | j ret_from_exception | |
151 | nop | |
152 | ||
153 | ENTRY(handle_ccu) # CCU #8 | |
154 | SAVE_ALL | |
155 | mv r4, r0 | |
156 | la r8, do_ccu | |
157 | brl r8 | |
158 | mv r4, r0 | |
159 | j ret_from_exception | |
160 | nop | |
161 | ||
162 | ENTRY(handle_ri) # RI #9 | |
163 | SAVE_ALL | |
164 | mv r4, r0 | |
165 | la r8, do_ri | |
166 | brl r8 | |
167 | mv r4, r0 | |
168 | j ret_from_exception | |
169 | nop | |
170 | ||
171 | ENTRY(handle_tr) # Trap #10 | |
172 | SAVE_ALL | |
173 | mv r4, r0 | |
174 | la r8, do_tr | |
175 | brl r8 | |
176 | mv r4, r0 | |
177 | j ret_from_exception | |
178 | nop | |
179 | ||
180 | ENTRY(handle_adedata) # AdES-instruction #12 | |
181 | SAVE_ALL | |
182 | mfcr r8, cr6 | |
183 | nop | |
184 | nop | |
185 | sw r8, [r0, PT_EMA] | |
186 | mv r4, r0 | |
187 | la r8, do_adedata | |
188 | brl r8 | |
189 | mv r4, r0 | |
190 | j ret_from_exception | |
191 | nop | |
192 | ||
193 | ENTRY(handle_cee) # CeE #16 | |
194 | SAVE_ALL | |
195 | mv r4, r0 | |
196 | la r8, do_cee | |
197 | brl r8 | |
198 | mv r4, r0 | |
199 | j ret_from_exception | |
200 | nop | |
201 | ||
202 | ENTRY(handle_cpe) # CpE #17 | |
203 | SAVE_ALL | |
204 | mv r4, r0 | |
205 | la r8, do_cpe | |
206 | brl r8 | |
207 | mv r4, r0 | |
208 | j ret_from_exception | |
209 | nop | |
210 | ||
211 | ENTRY(handle_dbe) # BusEL-data #18 | |
212 | SAVE_ALL | |
213 | mv r4, r0 | |
214 | la r8, do_be | |
215 | brl r8 | |
216 | mv r4, r0 | |
217 | j ret_from_exception | |
218 | nop | |
219 | ||
220 | ENTRY(handle_reserved) # others | |
221 | SAVE_ALL | |
222 | mv r4, r0 | |
223 | la r8, do_reserved | |
224 | brl r8 | |
225 | mv r4, r0 | |
226 | j ret_from_exception | |
227 | nop | |
228 | ||
229 | #ifndef CONFIG_PREEMPT | |
230 | #define resume_kernel restore_all | |
231 | #else | |
232 | #define __ret_from_irq ret_from_exception | |
233 | #endif | |
234 | ||
235 | .align 2 | |
236 | #ifndef CONFIG_PREEMPT | |
237 | ENTRY(ret_from_exception) | |
238 | disable_irq # preempt stop | |
239 | nop | |
240 | j __ret_from_irq | |
241 | nop | |
242 | #endif | |
243 | ||
244 | ENTRY(ret_from_irq) | |
245 | sw r16, [r28, TI_REGS] | |
246 | ||
247 | ENTRY(__ret_from_irq) | |
248 | lw r8, [r0, PT_PSR] # returning to kernel mode? | |
249 | andri.c r8, r8, KU_USER | |
250 | beq resume_kernel | |
251 | ||
252 | resume_userspace: | |
253 | disable_irq | |
254 | lw r6, [r28, TI_FLAGS] # current->work | |
255 | li r8, _TIF_WORK_MASK | |
256 | and.c r8, r8, r6 # ignoring syscall_trace | |
257 | bne work_pending | |
258 | nop | |
259 | j restore_all | |
260 | nop | |
261 | ||
262 | #ifdef CONFIG_PREEMPT | |
263 | resume_kernel: | |
264 | disable_irq | |
265 | lw r8, [r28, TI_PRE_COUNT] | |
266 | cmpz.c r8 | |
5fbbf8a1 | 267 | bne restore_all |
6bc9a396 CL |
268 | need_resched: |
269 | lw r8, [r28, TI_FLAGS] | |
270 | andri.c r9, r8, _TIF_NEED_RESCHED | |
271 | beq restore_all | |
272 | lw r8, [r28, PT_PSR] # Interrupts off? | |
273 | andri.c r8, r8, 1 | |
274 | beq restore_all | |
275 | bl preempt_schedule_irq | |
276 | nop | |
277 | j need_resched | |
278 | nop | |
279 | #endif | |
280 | ||
1856ab6d AV |
281 | ENTRY(ret_from_kernel_thread) |
282 | bl schedule_tail # r4=struct task_struct *prev | |
283 | nop | |
284 | mv r4, r13 | |
285 | brl r12 | |
286 | j syscall_exit | |
287 | ||
6bc9a396 CL |
288 | ENTRY(ret_from_fork) |
289 | bl schedule_tail # r4=struct task_struct *prev | |
290 | ||
291 | ENTRY(syscall_exit) | |
292 | nop | |
293 | disable_irq | |
294 | lw r6, [r28, TI_FLAGS] # current->work | |
295 | li r8, _TIF_WORK_MASK | |
296 | and.c r8, r6, r8 | |
297 | bne syscall_exit_work | |
298 | ||
299 | ENTRY(restore_all) # restore full frame | |
300 | RESTORE_ALL_AND_RET | |
301 | ||
302 | work_pending: | |
303 | andri.c r8, r6, _TIF_NEED_RESCHED # r6 is preloaded with TI_FLAGS | |
304 | beq work_notifysig | |
305 | work_resched: | |
306 | bl schedule | |
307 | nop | |
308 | disable_irq | |
309 | lw r6, [r28, TI_FLAGS] | |
310 | li r8, _TIF_WORK_MASK | |
311 | and.c r8, r6, r8 # is there any work to be done | |
312 | # other than syscall tracing? | |
313 | beq restore_all | |
314 | andri.c r8, r6, _TIF_NEED_RESCHED | |
315 | bne work_resched | |
316 | ||
317 | work_notifysig: | |
318 | mv r4, r0 | |
319 | li r5, 0 | |
320 | bl do_notify_resume # r6 already loaded | |
321 | nop | |
322 | j resume_userspace | |
323 | nop | |
324 | ||
325 | ENTRY(syscall_exit_work) | |
326 | li r8, _TIF_SYSCALL_TRACE | |
327 | and.c r8, r8, r6 # r6 is preloaded with TI_FLAGS | |
328 | beq work_pending # trace bit set? | |
329 | nop | |
330 | enable_irq | |
331 | mv r4, r0 | |
332 | li r5, 1 | |
333 | bl do_syscall_trace | |
334 | nop | |
335 | b resume_userspace | |
336 | nop | |
337 | ||
338 | .macro save_context reg | |
339 | sw r12, [\reg, THREAD_REG12]; | |
340 | sw r13, [\reg, THREAD_REG13]; | |
341 | sw r14, [\reg, THREAD_REG14]; | |
342 | sw r15, [\reg, THREAD_REG15]; | |
343 | sw r16, [\reg, THREAD_REG16]; | |
344 | sw r17, [\reg, THREAD_REG17]; | |
345 | sw r18, [\reg, THREAD_REG18]; | |
346 | sw r19, [\reg, THREAD_REG19]; | |
347 | sw r20, [\reg, THREAD_REG20]; | |
348 | sw r21, [\reg, THREAD_REG21]; | |
349 | sw r29, [\reg, THREAD_REG29]; | |
350 | sw r2, [\reg, THREAD_REG2]; | |
351 | sw r0, [\reg, THREAD_REG0] | |
352 | .endm | |
353 | ||
354 | .macro restore_context reg | |
355 | lw r12, [\reg, THREAD_REG12]; | |
356 | lw r13, [\reg, THREAD_REG13]; | |
357 | lw r14, [\reg, THREAD_REG14]; | |
358 | lw r15, [\reg, THREAD_REG15]; | |
359 | lw r16, [\reg, THREAD_REG16]; | |
360 | lw r17, [\reg, THREAD_REG17]; | |
361 | lw r18, [\reg, THREAD_REG18]; | |
362 | lw r19, [\reg, THREAD_REG19]; | |
363 | lw r20, [\reg, THREAD_REG20]; | |
364 | lw r21, [\reg, THREAD_REG21]; | |
365 | lw r29, [\reg, THREAD_REG29]; | |
366 | lw r0, [\reg, THREAD_REG0]; | |
367 | lw r2, [\reg, THREAD_REG2]; | |
368 | lw r3, [\reg, THREAD_REG3] | |
369 | .endm | |
370 | ||
371 | /* | |
372 | * task_struct *resume(task_struct *prev, task_struct *next, | |
373 | * struct thread_info *next_ti) | |
374 | */ | |
375 | ENTRY(resume) | |
376 | mfcr r9, cr0 | |
377 | nop | |
378 | nop | |
379 | sw r9, [r4, THREAD_PSR] | |
380 | save_context r4 | |
381 | sw r3, [r4, THREAD_REG3] | |
382 | ||
383 | mv r28, r6 | |
384 | restore_context r5 | |
385 | mv r8, r6 | |
386 | addi r8, KERNEL_STACK_SIZE | |
387 | subi r8, 32 | |
388 | la r9, kernelsp; | |
389 | sw r8, [r9]; | |
390 | ||
391 | mfcr r9, cr0 | |
392 | ldis r7, 0x00ff | |
393 | nop | |
394 | and r9, r9, r7 | |
395 | lw r6, [r5, THREAD_PSR] | |
396 | not r7, r7 | |
397 | and r6, r6, r7 | |
398 | or r6, r6, r9 | |
399 | mtcr r6, cr0 | |
400 | nop; nop; nop; nop; nop | |
401 | br r3 | |
402 | ||
403 | ENTRY(handle_sys) | |
404 | SAVE_ALL | |
e831a9c6 CL |
405 | sw r8, [r0, 16] # argument 5 from user r8 |
406 | sw r9, [r0, 20] # argument 6 from user r9 | |
6bc9a396 CL |
407 | enable_irq |
408 | ||
409 | sw r4, [r0, PT_ORIG_R4] #for restart syscall | |
410 | sw r7, [r0, PT_ORIG_R7] #for restart syscall | |
411 | sw r27, [r0, PT_IS_SYSCALL] # it from syscall | |
412 | ||
413 | lw r9, [r0, PT_EPC] # skip syscall on return | |
414 | addi r9, 4 | |
415 | sw r9, [r0, PT_EPC] | |
416 | ||
417 | cmpi.c r27, __NR_syscalls # check syscall number | |
5fbbf8a1 | 418 | bcs illegal_syscall |
6bc9a396 | 419 | |
f673c032 | 420 | slli r8, r27, 2 # get syscall routine |
6bc9a396 CL |
421 | la r11, sys_call_table |
422 | add r11, r11, r8 | |
423 | lw r10, [r11] # get syscall entry | |
6bc9a396 CL |
424 | |
425 | cmpz.c r10 | |
426 | beq illegal_syscall | |
427 | ||
6bc9a396 CL |
428 | lw r8, [r28, TI_FLAGS] |
429 | li r9, _TIF_SYSCALL_TRACE | |
430 | and.c r8, r8, r9 | |
431 | bne syscall_trace_entry | |
432 | ||
433 | brl r10 # Do The Real system call | |
434 | ||
435 | cmpi.c r4, 0 | |
436 | blt 1f | |
437 | ldi r8, 0 | |
438 | sw r8, [r0, PT_R7] | |
439 | b 2f | |
440 | 1: | |
0402c91a | 441 | cmpi.c r4, -MAX_ERRNO - 1 |
6bc9a396 CL |
442 | ble 2f |
443 | ldi r8, 0x1; | |
444 | sw r8, [r0, PT_R7] | |
445 | neg r4, r4 | |
446 | 2: | |
447 | sw r4, [r0, PT_R4] # save result | |
448 | ||
449 | syscall_return: | |
450 | disable_irq | |
451 | lw r6, [r28, TI_FLAGS] # current->work | |
452 | li r8, _TIF_WORK_MASK | |
453 | and.c r8, r6, r8 | |
454 | bne syscall_return_work | |
455 | j restore_all | |
456 | ||
457 | syscall_return_work: | |
458 | j syscall_exit_work | |
459 | ||
460 | syscall_trace_entry: | |
461 | mv r16, r10 | |
462 | mv r4, r0 | |
463 | li r5, 0 | |
464 | bl do_syscall_trace | |
465 | ||
466 | mv r8, r16 | |
467 | lw r4, [r0, PT_R4] # Restore argument registers | |
468 | lw r5, [r0, PT_R5] | |
469 | lw r6, [r0, PT_R6] | |
470 | lw r7, [r0, PT_R7] | |
471 | brl r8 | |
472 | ||
0402c91a | 473 | li r8, -MAX_ERRNO - 1 |
6bc9a396 CL |
474 | sw r8, [r0, PT_R7] # set error flag |
475 | ||
476 | neg r4, r4 # error | |
477 | sw r4, [r0, PT_R0] # set flag for syscall | |
478 | # restarting | |
479 | 1: sw r4, [r0, PT_R2] # result | |
480 | j syscall_exit | |
481 | ||
6bc9a396 CL |
482 | illegal_syscall: |
483 | ldi r4, -ENOSYS # error | |
484 | sw r4, [r0, PT_ORIG_R4] | |
485 | sw r4, [r0, PT_R4] | |
486 | ldi r9, 1 # set error flag | |
487 | sw r9, [r0, PT_R7] | |
488 | j syscall_return | |
489 | ||
6bc9a396 CL |
490 | ENTRY(sys_rt_sigreturn) |
491 | mv r4, r0 | |
492 | la r8, score_rt_sigreturn | |
493 | br r8 |