Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
36ccf1c0 | 6 | * Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle |
1da177e4 LT |
7 | * Copyright (C) 1995, 1996 Paul M. Antoine |
8 | * Copyright (C) 1998 Ulf Carlsson | |
9 | * Copyright (C) 1999 Silicon Graphics, Inc. | |
10 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
11 | * Copyright (C) 2000, 01 MIPS Technologies, Inc. | |
3b2396d9 | 12 | * Copyright (C) 2002, 2003, 2004, 2005 Maciej W. Rozycki |
1da177e4 | 13 | */ |
1da177e4 LT |
14 | #include <linux/init.h> |
15 | #include <linux/mm.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/smp.h> | |
1da177e4 LT |
19 | #include <linux/spinlock.h> |
20 | #include <linux/kallsyms.h> | |
e01402b1 | 21 | #include <linux/bootmem.h> |
d4fd1989 | 22 | #include <linux/interrupt.h> |
1da177e4 LT |
23 | |
24 | #include <asm/bootinfo.h> | |
25 | #include <asm/branch.h> | |
26 | #include <asm/break.h> | |
27 | #include <asm/cpu.h> | |
e50c0a8f | 28 | #include <asm/dsp.h> |
1da177e4 | 29 | #include <asm/fpu.h> |
340ee4b9 RB |
30 | #include <asm/mipsregs.h> |
31 | #include <asm/mipsmtregs.h> | |
1da177e4 LT |
32 | #include <asm/module.h> |
33 | #include <asm/pgtable.h> | |
34 | #include <asm/ptrace.h> | |
35 | #include <asm/sections.h> | |
36 | #include <asm/system.h> | |
37 | #include <asm/tlbdebug.h> | |
38 | #include <asm/traps.h> | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/mmu_context.h> | |
41 | #include <asm/watch.h> | |
42 | #include <asm/types.h> | |
1df0f0ff | 43 | #include <asm/stacktrace.h> |
1da177e4 | 44 | |
e4ac58af | 45 | extern asmlinkage void handle_int(void); |
1da177e4 LT |
46 | extern asmlinkage void handle_tlbm(void); |
47 | extern asmlinkage void handle_tlbl(void); | |
48 | extern asmlinkage void handle_tlbs(void); | |
49 | extern asmlinkage void handle_adel(void); | |
50 | extern asmlinkage void handle_ades(void); | |
51 | extern asmlinkage void handle_ibe(void); | |
52 | extern asmlinkage void handle_dbe(void); | |
53 | extern asmlinkage void handle_sys(void); | |
54 | extern asmlinkage void handle_bp(void); | |
55 | extern asmlinkage void handle_ri(void); | |
5b10496b AN |
56 | extern asmlinkage void handle_ri_rdhwr_vivt(void); |
57 | extern asmlinkage void handle_ri_rdhwr(void); | |
1da177e4 LT |
58 | extern asmlinkage void handle_cpu(void); |
59 | extern asmlinkage void handle_ov(void); | |
60 | extern asmlinkage void handle_tr(void); | |
61 | extern asmlinkage void handle_fpe(void); | |
62 | extern asmlinkage void handle_mdmx(void); | |
63 | extern asmlinkage void handle_watch(void); | |
340ee4b9 | 64 | extern asmlinkage void handle_mt(void); |
e50c0a8f | 65 | extern asmlinkage void handle_dsp(void); |
1da177e4 LT |
66 | extern asmlinkage void handle_mcheck(void); |
67 | extern asmlinkage void handle_reserved(void); | |
68 | ||
12616ed2 | 69 | extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, |
e04582b7 | 70 | struct mips_fpu_struct *ctx, int has_fpu); |
1da177e4 LT |
71 | |
72 | void (*board_be_init)(void); | |
73 | int (*board_be_handler)(struct pt_regs *regs, int is_fixup); | |
e01402b1 RB |
74 | void (*board_nmi_handler_setup)(void); |
75 | void (*board_ejtag_handler_setup)(void); | |
76 | void (*board_bind_eic_interrupt)(int irq, int regset); | |
1da177e4 | 77 | |
1da177e4 | 78 | |
4d157d5e | 79 | static void show_raw_backtrace(unsigned long reg29) |
e889d78f | 80 | { |
4d157d5e | 81 | unsigned long *sp = (unsigned long *)reg29; |
e889d78f AN |
82 | unsigned long addr; |
83 | ||
84 | printk("Call Trace:"); | |
85 | #ifdef CONFIG_KALLSYMS | |
86 | printk("\n"); | |
87 | #endif | |
87151ae3 FBH |
88 | while (!kstack_end(sp)) { |
89 | addr = *sp++; | |
90 | if (__kernel_text_address(addr)) | |
91 | print_ip_sym(addr); | |
e889d78f AN |
92 | } |
93 | printk("\n"); | |
94 | } | |
95 | ||
f66686f7 | 96 | #ifdef CONFIG_KALLSYMS |
1df0f0ff | 97 | int raw_show_trace; |
f66686f7 AN |
98 | static int __init set_raw_show_trace(char *str) |
99 | { | |
100 | raw_show_trace = 1; | |
101 | return 1; | |
102 | } | |
103 | __setup("raw_show_trace", set_raw_show_trace); | |
1df0f0ff | 104 | #endif |
4d157d5e | 105 | |
87151ae3 | 106 | static void show_backtrace(struct task_struct *task, struct pt_regs *regs) |
f66686f7 | 107 | { |
4d157d5e FBH |
108 | unsigned long sp = regs->regs[29]; |
109 | unsigned long ra = regs->regs[31]; | |
f66686f7 | 110 | unsigned long pc = regs->cp0_epc; |
f66686f7 AN |
111 | |
112 | if (raw_show_trace || !__kernel_text_address(pc)) { | |
87151ae3 | 113 | show_raw_backtrace(sp); |
f66686f7 AN |
114 | return; |
115 | } | |
116 | printk("Call Trace:\n"); | |
4d157d5e | 117 | do { |
87151ae3 | 118 | print_ip_sym(pc); |
1924600c | 119 | pc = unwind_stack(task, &sp, pc, &ra); |
4d157d5e | 120 | } while (pc); |
f66686f7 AN |
121 | printk("\n"); |
122 | } | |
f66686f7 | 123 | |
1da177e4 LT |
124 | /* |
125 | * This routine abuses get_user()/put_user() to reference pointers | |
126 | * with at least a bit of error checking ... | |
127 | */ | |
f66686f7 | 128 | static void show_stacktrace(struct task_struct *task, struct pt_regs *regs) |
1da177e4 LT |
129 | { |
130 | const int field = 2 * sizeof(unsigned long); | |
131 | long stackdata; | |
132 | int i; | |
f66686f7 | 133 | unsigned long *sp = (unsigned long *)regs->regs[29]; |
1da177e4 LT |
134 | |
135 | printk("Stack :"); | |
136 | i = 0; | |
137 | while ((unsigned long) sp & (PAGE_SIZE - 1)) { | |
138 | if (i && ((i % (64 / field)) == 0)) | |
139 | printk("\n "); | |
140 | if (i > 39) { | |
141 | printk(" ..."); | |
142 | break; | |
143 | } | |
144 | ||
145 | if (__get_user(stackdata, sp++)) { | |
146 | printk(" (Bad stack address)"); | |
147 | break; | |
148 | } | |
149 | ||
150 | printk(" %0*lx", field, stackdata); | |
151 | i++; | |
152 | } | |
153 | printk("\n"); | |
87151ae3 | 154 | show_backtrace(task, regs); |
f66686f7 AN |
155 | } |
156 | ||
f66686f7 AN |
157 | void show_stack(struct task_struct *task, unsigned long *sp) |
158 | { | |
159 | struct pt_regs regs; | |
160 | if (sp) { | |
161 | regs.regs[29] = (unsigned long)sp; | |
162 | regs.regs[31] = 0; | |
163 | regs.cp0_epc = 0; | |
164 | } else { | |
165 | if (task && task != current) { | |
166 | regs.regs[29] = task->thread.reg29; | |
167 | regs.regs[31] = 0; | |
168 | regs.cp0_epc = task->thread.reg31; | |
169 | } else { | |
170 | prepare_frametrace(®s); | |
171 | } | |
172 | } | |
173 | show_stacktrace(task, ®s); | |
1da177e4 LT |
174 | } |
175 | ||
176 | /* | |
177 | * The architecture-independent dump_stack generator | |
178 | */ | |
179 | void dump_stack(void) | |
180 | { | |
1666a6fc | 181 | struct pt_regs regs; |
1da177e4 | 182 | |
1666a6fc FBH |
183 | prepare_frametrace(®s); |
184 | show_backtrace(current, ®s); | |
1da177e4 LT |
185 | } |
186 | ||
187 | EXPORT_SYMBOL(dump_stack); | |
188 | ||
189 | void show_code(unsigned int *pc) | |
190 | { | |
191 | long i; | |
192 | ||
193 | printk("\nCode:"); | |
194 | ||
195 | for(i = -3 ; i < 6 ; i++) { | |
196 | unsigned int insn; | |
197 | if (__get_user(insn, pc + i)) { | |
198 | printk(" (Bad address in epc)\n"); | |
199 | break; | |
200 | } | |
201 | printk("%c%08x%c", (i?' ':'<'), insn, (i?' ':'>')); | |
202 | } | |
203 | } | |
204 | ||
205 | void show_regs(struct pt_regs *regs) | |
206 | { | |
207 | const int field = 2 * sizeof(unsigned long); | |
208 | unsigned int cause = regs->cp0_cause; | |
209 | int i; | |
210 | ||
211 | printk("Cpu %d\n", smp_processor_id()); | |
212 | ||
213 | /* | |
214 | * Saved main processor registers | |
215 | */ | |
216 | for (i = 0; i < 32; ) { | |
217 | if ((i % 4) == 0) | |
218 | printk("$%2d :", i); | |
219 | if (i == 0) | |
220 | printk(" %0*lx", field, 0UL); | |
221 | else if (i == 26 || i == 27) | |
222 | printk(" %*s", field, ""); | |
223 | else | |
224 | printk(" %0*lx", field, regs->regs[i]); | |
225 | ||
226 | i++; | |
227 | if ((i % 4) == 0) | |
228 | printk("\n"); | |
229 | } | |
230 | ||
9693a853 FBH |
231 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
232 | printk("Acx : %0*lx\n", field, regs->acx); | |
233 | #endif | |
1da177e4 LT |
234 | printk("Hi : %0*lx\n", field, regs->hi); |
235 | printk("Lo : %0*lx\n", field, regs->lo); | |
236 | ||
237 | /* | |
238 | * Saved cp0 registers | |
239 | */ | |
240 | printk("epc : %0*lx ", field, regs->cp0_epc); | |
241 | print_symbol("%s ", regs->cp0_epc); | |
242 | printk(" %s\n", print_tainted()); | |
243 | printk("ra : %0*lx ", field, regs->regs[31]); | |
244 | print_symbol("%s\n", regs->regs[31]); | |
245 | ||
246 | printk("Status: %08x ", (uint32_t) regs->cp0_status); | |
247 | ||
3b2396d9 MR |
248 | if (current_cpu_data.isa_level == MIPS_CPU_ISA_I) { |
249 | if (regs->cp0_status & ST0_KUO) | |
250 | printk("KUo "); | |
251 | if (regs->cp0_status & ST0_IEO) | |
252 | printk("IEo "); | |
253 | if (regs->cp0_status & ST0_KUP) | |
254 | printk("KUp "); | |
255 | if (regs->cp0_status & ST0_IEP) | |
256 | printk("IEp "); | |
257 | if (regs->cp0_status & ST0_KUC) | |
258 | printk("KUc "); | |
259 | if (regs->cp0_status & ST0_IEC) | |
260 | printk("IEc "); | |
261 | } else { | |
262 | if (regs->cp0_status & ST0_KX) | |
263 | printk("KX "); | |
264 | if (regs->cp0_status & ST0_SX) | |
265 | printk("SX "); | |
266 | if (regs->cp0_status & ST0_UX) | |
267 | printk("UX "); | |
268 | switch (regs->cp0_status & ST0_KSU) { | |
269 | case KSU_USER: | |
270 | printk("USER "); | |
271 | break; | |
272 | case KSU_SUPERVISOR: | |
273 | printk("SUPERVISOR "); | |
274 | break; | |
275 | case KSU_KERNEL: | |
276 | printk("KERNEL "); | |
277 | break; | |
278 | default: | |
279 | printk("BAD_MODE "); | |
280 | break; | |
281 | } | |
282 | if (regs->cp0_status & ST0_ERL) | |
283 | printk("ERL "); | |
284 | if (regs->cp0_status & ST0_EXL) | |
285 | printk("EXL "); | |
286 | if (regs->cp0_status & ST0_IE) | |
287 | printk("IE "); | |
1da177e4 | 288 | } |
1da177e4 LT |
289 | printk("\n"); |
290 | ||
291 | printk("Cause : %08x\n", cause); | |
292 | ||
293 | cause = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE; | |
294 | if (1 <= cause && cause <= 5) | |
295 | printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr); | |
296 | ||
297 | printk("PrId : %08x\n", read_c0_prid()); | |
298 | } | |
299 | ||
300 | void show_registers(struct pt_regs *regs) | |
301 | { | |
302 | show_regs(regs); | |
303 | print_modules(); | |
304 | printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n", | |
305 | current->comm, current->pid, current_thread_info(), current); | |
f66686f7 | 306 | show_stacktrace(current, regs); |
1da177e4 LT |
307 | show_code((unsigned int *) regs->cp0_epc); |
308 | printk("\n"); | |
309 | } | |
310 | ||
311 | static DEFINE_SPINLOCK(die_lock); | |
312 | ||
178086c8 | 313 | NORET_TYPE void ATTRIB_NORET die(const char * str, struct pt_regs * regs) |
1da177e4 LT |
314 | { |
315 | static int die_counter; | |
41c594ab RB |
316 | #ifdef CONFIG_MIPS_MT_SMTC |
317 | unsigned long dvpret = dvpe(); | |
318 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
319 | |
320 | console_verbose(); | |
321 | spin_lock_irq(&die_lock); | |
41c594ab RB |
322 | bust_spinlocks(1); |
323 | #ifdef CONFIG_MIPS_MT_SMTC | |
324 | mips_mt_regdump(dvpret); | |
325 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
178086c8 | 326 | printk("%s[#%d]:\n", str, ++die_counter); |
1da177e4 LT |
327 | show_registers(regs); |
328 | spin_unlock_irq(&die_lock); | |
d4fd1989 MB |
329 | |
330 | if (in_interrupt()) | |
331 | panic("Fatal exception in interrupt"); | |
332 | ||
333 | if (panic_on_oops) { | |
334 | printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n"); | |
335 | ssleep(5); | |
336 | panic("Fatal exception"); | |
337 | } | |
338 | ||
1da177e4 LT |
339 | do_exit(SIGSEGV); |
340 | } | |
341 | ||
1da177e4 LT |
342 | extern const struct exception_table_entry __start___dbe_table[]; |
343 | extern const struct exception_table_entry __stop___dbe_table[]; | |
344 | ||
b6dcec9b RB |
345 | __asm__( |
346 | " .section __dbe_table, \"a\"\n" | |
347 | " .previous \n"); | |
1da177e4 LT |
348 | |
349 | /* Given an address, look for it in the exception tables. */ | |
350 | static const struct exception_table_entry *search_dbe_tables(unsigned long addr) | |
351 | { | |
352 | const struct exception_table_entry *e; | |
353 | ||
354 | e = search_extable(__start___dbe_table, __stop___dbe_table - 1, addr); | |
355 | if (!e) | |
356 | e = search_module_dbetables(addr); | |
357 | return e; | |
358 | } | |
359 | ||
360 | asmlinkage void do_be(struct pt_regs *regs) | |
361 | { | |
362 | const int field = 2 * sizeof(unsigned long); | |
363 | const struct exception_table_entry *fixup = NULL; | |
364 | int data = regs->cp0_cause & 4; | |
365 | int action = MIPS_BE_FATAL; | |
366 | ||
367 | /* XXX For now. Fixme, this searches the wrong table ... */ | |
368 | if (data && !user_mode(regs)) | |
369 | fixup = search_dbe_tables(exception_epc(regs)); | |
370 | ||
371 | if (fixup) | |
372 | action = MIPS_BE_FIXUP; | |
373 | ||
374 | if (board_be_handler) | |
375 | action = board_be_handler(regs, fixup != 0); | |
376 | ||
377 | switch (action) { | |
378 | case MIPS_BE_DISCARD: | |
379 | return; | |
380 | case MIPS_BE_FIXUP: | |
381 | if (fixup) { | |
382 | regs->cp0_epc = fixup->nextinsn; | |
383 | return; | |
384 | } | |
385 | break; | |
386 | default: | |
387 | break; | |
388 | } | |
389 | ||
390 | /* | |
391 | * Assume it would be too dangerous to continue ... | |
392 | */ | |
393 | printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", | |
394 | data ? "Data" : "Instruction", | |
395 | field, regs->cp0_epc, field, regs->regs[31]); | |
396 | die_if_kernel("Oops", regs); | |
397 | force_sig(SIGBUS, current); | |
398 | } | |
399 | ||
1da177e4 LT |
400 | /* |
401 | * ll/sc emulation | |
402 | */ | |
403 | ||
404 | #define OPCODE 0xfc000000 | |
405 | #define BASE 0x03e00000 | |
406 | #define RT 0x001f0000 | |
407 | #define OFFSET 0x0000ffff | |
408 | #define LL 0xc0000000 | |
409 | #define SC 0xe0000000 | |
3c37026d RB |
410 | #define SPEC3 0x7c000000 |
411 | #define RD 0x0000f800 | |
412 | #define FUNC 0x0000003f | |
413 | #define RDHWR 0x0000003b | |
1da177e4 LT |
414 | |
415 | /* | |
416 | * The ll_bit is cleared by r*_switch.S | |
417 | */ | |
418 | ||
419 | unsigned long ll_bit; | |
420 | ||
421 | static struct task_struct *ll_task = NULL; | |
422 | ||
423 | static inline void simulate_ll(struct pt_regs *regs, unsigned int opcode) | |
424 | { | |
fe00f943 | 425 | unsigned long value, __user *vaddr; |
1da177e4 LT |
426 | long offset; |
427 | int signal = 0; | |
428 | ||
429 | /* | |
430 | * analyse the ll instruction that just caused a ri exception | |
431 | * and put the referenced address to addr. | |
432 | */ | |
433 | ||
434 | /* sign extend offset */ | |
435 | offset = opcode & OFFSET; | |
436 | offset <<= 16; | |
437 | offset >>= 16; | |
438 | ||
fe00f943 RB |
439 | vaddr = (unsigned long __user *) |
440 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); | |
1da177e4 LT |
441 | |
442 | if ((unsigned long)vaddr & 3) { | |
443 | signal = SIGBUS; | |
444 | goto sig; | |
445 | } | |
446 | if (get_user(value, vaddr)) { | |
447 | signal = SIGSEGV; | |
448 | goto sig; | |
449 | } | |
450 | ||
451 | preempt_disable(); | |
452 | ||
453 | if (ll_task == NULL || ll_task == current) { | |
454 | ll_bit = 1; | |
455 | } else { | |
456 | ll_bit = 0; | |
457 | } | |
458 | ll_task = current; | |
459 | ||
460 | preempt_enable(); | |
461 | ||
6dd04688 RB |
462 | compute_return_epc(regs); |
463 | ||
1da177e4 LT |
464 | regs->regs[(opcode & RT) >> 16] = value; |
465 | ||
1da177e4 LT |
466 | return; |
467 | ||
468 | sig: | |
469 | force_sig(signal, current); | |
470 | } | |
471 | ||
472 | static inline void simulate_sc(struct pt_regs *regs, unsigned int opcode) | |
473 | { | |
fe00f943 RB |
474 | unsigned long __user *vaddr; |
475 | unsigned long reg; | |
1da177e4 LT |
476 | long offset; |
477 | int signal = 0; | |
478 | ||
479 | /* | |
480 | * analyse the sc instruction that just caused a ri exception | |
481 | * and put the referenced address to addr. | |
482 | */ | |
483 | ||
484 | /* sign extend offset */ | |
485 | offset = opcode & OFFSET; | |
486 | offset <<= 16; | |
487 | offset >>= 16; | |
488 | ||
fe00f943 RB |
489 | vaddr = (unsigned long __user *) |
490 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); | |
1da177e4 LT |
491 | reg = (opcode & RT) >> 16; |
492 | ||
493 | if ((unsigned long)vaddr & 3) { | |
494 | signal = SIGBUS; | |
495 | goto sig; | |
496 | } | |
497 | ||
498 | preempt_disable(); | |
499 | ||
500 | if (ll_bit == 0 || ll_task != current) { | |
05b8042a | 501 | compute_return_epc(regs); |
1da177e4 LT |
502 | regs->regs[reg] = 0; |
503 | preempt_enable(); | |
1da177e4 LT |
504 | return; |
505 | } | |
506 | ||
507 | preempt_enable(); | |
508 | ||
509 | if (put_user(regs->regs[reg], vaddr)) { | |
510 | signal = SIGSEGV; | |
511 | goto sig; | |
512 | } | |
513 | ||
6dd04688 | 514 | compute_return_epc(regs); |
1da177e4 LT |
515 | regs->regs[reg] = 1; |
516 | ||
1da177e4 LT |
517 | return; |
518 | ||
519 | sig: | |
520 | force_sig(signal, current); | |
521 | } | |
522 | ||
523 | /* | |
524 | * ll uses the opcode of lwc0 and sc uses the opcode of swc0. That is both | |
525 | * opcodes are supposed to result in coprocessor unusable exceptions if | |
526 | * executed on ll/sc-less processors. That's the theory. In practice a | |
527 | * few processors such as NEC's VR4100 throw reserved instruction exceptions | |
528 | * instead, so we're doing the emulation thing in both exception handlers. | |
529 | */ | |
530 | static inline int simulate_llsc(struct pt_regs *regs) | |
531 | { | |
532 | unsigned int opcode; | |
533 | ||
e5679882 RB |
534 | if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
535 | goto out_sigsegv; | |
1da177e4 LT |
536 | |
537 | if ((opcode & OPCODE) == LL) { | |
538 | simulate_ll(regs, opcode); | |
539 | return 0; | |
540 | } | |
541 | if ((opcode & OPCODE) == SC) { | |
542 | simulate_sc(regs, opcode); | |
543 | return 0; | |
544 | } | |
545 | ||
546 | return -EFAULT; /* Strange things going on ... */ | |
e5679882 RB |
547 | |
548 | out_sigsegv: | |
549 | force_sig(SIGSEGV, current); | |
550 | return -EFAULT; | |
1da177e4 LT |
551 | } |
552 | ||
3c37026d RB |
553 | /* |
554 | * Simulate trapping 'rdhwr' instructions to provide user accessible | |
555 | * registers not implemented in hardware. The only current use of this | |
556 | * is the thread area pointer. | |
557 | */ | |
558 | static inline int simulate_rdhwr(struct pt_regs *regs) | |
559 | { | |
dc8f6029 | 560 | struct thread_info *ti = task_thread_info(current); |
3c37026d RB |
561 | unsigned int opcode; |
562 | ||
e5679882 RB |
563 | if (get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
564 | goto out_sigsegv; | |
3c37026d RB |
565 | |
566 | if (unlikely(compute_return_epc(regs))) | |
567 | return -EFAULT; | |
568 | ||
569 | if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) { | |
570 | int rd = (opcode & RD) >> 11; | |
571 | int rt = (opcode & RT) >> 16; | |
572 | switch (rd) { | |
573 | case 29: | |
574 | regs->regs[rt] = ti->tp_value; | |
56ebd51b | 575 | return 0; |
3c37026d RB |
576 | default: |
577 | return -EFAULT; | |
578 | } | |
579 | } | |
580 | ||
56ebd51b DJ |
581 | /* Not ours. */ |
582 | return -EFAULT; | |
e5679882 RB |
583 | |
584 | out_sigsegv: | |
585 | force_sig(SIGSEGV, current); | |
586 | return -EFAULT; | |
3c37026d RB |
587 | } |
588 | ||
1da177e4 LT |
589 | asmlinkage void do_ov(struct pt_regs *regs) |
590 | { | |
591 | siginfo_t info; | |
592 | ||
36ccf1c0 RB |
593 | die_if_kernel("Integer overflow", regs); |
594 | ||
1da177e4 LT |
595 | info.si_code = FPE_INTOVF; |
596 | info.si_signo = SIGFPE; | |
597 | info.si_errno = 0; | |
fe00f943 | 598 | info.si_addr = (void __user *) regs->cp0_epc; |
1da177e4 LT |
599 | force_sig_info(SIGFPE, &info, current); |
600 | } | |
601 | ||
602 | /* | |
603 | * XXX Delayed fp exceptions when doing a lazy ctx switch XXX | |
604 | */ | |
605 | asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) | |
606 | { | |
57725f9e CD |
607 | die_if_kernel("FP exception in kernel code", regs); |
608 | ||
1da177e4 LT |
609 | if (fcr31 & FPU_CSR_UNI_X) { |
610 | int sig; | |
611 | ||
1da177e4 | 612 | /* |
a3dddd56 | 613 | * Unimplemented operation exception. If we've got the full |
1da177e4 LT |
614 | * software emulator on-board, let's use it... |
615 | * | |
616 | * Force FPU to dump state into task/thread context. We're | |
617 | * moving a lot of data here for what is probably a single | |
618 | * instruction, but the alternative is to pre-decode the FP | |
619 | * register operands before invoking the emulator, which seems | |
620 | * a bit extreme for what should be an infrequent event. | |
621 | */ | |
cd21dfcf | 622 | /* Ensure 'resume' not overwrite saved fp context again. */ |
53dc8028 | 623 | lose_fpu(1); |
1da177e4 LT |
624 | |
625 | /* Run the emulator */ | |
e04582b7 | 626 | sig = fpu_emulator_cop1Handler (regs, ¤t->thread.fpu, 1); |
1da177e4 LT |
627 | |
628 | /* | |
629 | * We can't allow the emulated instruction to leave any of | |
630 | * the cause bit set in $fcr31. | |
631 | */ | |
eae89076 | 632 | current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X; |
1da177e4 LT |
633 | |
634 | /* Restore the hardware register state */ | |
53dc8028 | 635 | own_fpu(1); /* Using the FPU again. */ |
1da177e4 LT |
636 | |
637 | /* If something went wrong, signal */ | |
638 | if (sig) | |
639 | force_sig(sig, current); | |
640 | ||
641 | return; | |
642 | } | |
643 | ||
644 | force_sig(SIGFPE, current); | |
645 | } | |
646 | ||
647 | asmlinkage void do_bp(struct pt_regs *regs) | |
648 | { | |
649 | unsigned int opcode, bcode; | |
650 | siginfo_t info; | |
651 | ||
ba755f8e | 652 | if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
e5679882 | 653 | goto out_sigsegv; |
1da177e4 LT |
654 | |
655 | /* | |
656 | * There is the ancient bug in the MIPS assemblers that the break | |
657 | * code starts left to bit 16 instead to bit 6 in the opcode. | |
658 | * Gas is bug-compatible, but not always, grrr... | |
659 | * We handle both cases with a simple heuristics. --macro | |
660 | */ | |
661 | bcode = ((opcode >> 6) & ((1 << 20) - 1)); | |
662 | if (bcode < (1 << 10)) | |
663 | bcode <<= 10; | |
664 | ||
665 | /* | |
666 | * (A short test says that IRIX 5.3 sends SIGTRAP for all break | |
667 | * insns, even for break codes that indicate arithmetic failures. | |
668 | * Weird ...) | |
669 | * But should we continue the brokenness??? --macro | |
670 | */ | |
671 | switch (bcode) { | |
672 | case BRK_OVERFLOW << 10: | |
673 | case BRK_DIVZERO << 10: | |
63dc68a8 | 674 | die_if_kernel("Break instruction in kernel code", regs); |
1da177e4 LT |
675 | if (bcode == (BRK_DIVZERO << 10)) |
676 | info.si_code = FPE_INTDIV; | |
677 | else | |
678 | info.si_code = FPE_INTOVF; | |
679 | info.si_signo = SIGFPE; | |
680 | info.si_errno = 0; | |
fe00f943 | 681 | info.si_addr = (void __user *) regs->cp0_epc; |
1da177e4 LT |
682 | force_sig_info(SIGFPE, &info, current); |
683 | break; | |
63dc68a8 RB |
684 | case BRK_BUG: |
685 | die("Kernel bug detected", regs); | |
686 | break; | |
1da177e4 | 687 | default: |
63dc68a8 | 688 | die_if_kernel("Break instruction in kernel code", regs); |
1da177e4 LT |
689 | force_sig(SIGTRAP, current); |
690 | } | |
90fccb13 | 691 | return; |
e5679882 RB |
692 | |
693 | out_sigsegv: | |
694 | force_sig(SIGSEGV, current); | |
1da177e4 LT |
695 | } |
696 | ||
697 | asmlinkage void do_tr(struct pt_regs *regs) | |
698 | { | |
699 | unsigned int opcode, tcode = 0; | |
700 | siginfo_t info; | |
701 | ||
ba755f8e | 702 | if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
e5679882 | 703 | goto out_sigsegv; |
1da177e4 LT |
704 | |
705 | /* Immediate versions don't provide a code. */ | |
706 | if (!(opcode & OPCODE)) | |
707 | tcode = ((opcode >> 6) & ((1 << 10) - 1)); | |
708 | ||
709 | /* | |
710 | * (A short test says that IRIX 5.3 sends SIGTRAP for all trap | |
711 | * insns, even for trap codes that indicate arithmetic failures. | |
712 | * Weird ...) | |
713 | * But should we continue the brokenness??? --macro | |
714 | */ | |
715 | switch (tcode) { | |
716 | case BRK_OVERFLOW: | |
717 | case BRK_DIVZERO: | |
63dc68a8 | 718 | die_if_kernel("Trap instruction in kernel code", regs); |
1da177e4 LT |
719 | if (tcode == BRK_DIVZERO) |
720 | info.si_code = FPE_INTDIV; | |
721 | else | |
722 | info.si_code = FPE_INTOVF; | |
723 | info.si_signo = SIGFPE; | |
724 | info.si_errno = 0; | |
fe00f943 | 725 | info.si_addr = (void __user *) regs->cp0_epc; |
1da177e4 LT |
726 | force_sig_info(SIGFPE, &info, current); |
727 | break; | |
63dc68a8 RB |
728 | case BRK_BUG: |
729 | die("Kernel bug detected", regs); | |
730 | break; | |
1da177e4 | 731 | default: |
63dc68a8 | 732 | die_if_kernel("Trap instruction in kernel code", regs); |
1da177e4 LT |
733 | force_sig(SIGTRAP, current); |
734 | } | |
90fccb13 | 735 | return; |
e5679882 RB |
736 | |
737 | out_sigsegv: | |
738 | force_sig(SIGSEGV, current); | |
1da177e4 LT |
739 | } |
740 | ||
741 | asmlinkage void do_ri(struct pt_regs *regs) | |
742 | { | |
743 | die_if_kernel("Reserved instruction in kernel code", regs); | |
744 | ||
745 | if (!cpu_has_llsc) | |
746 | if (!simulate_llsc(regs)) | |
747 | return; | |
748 | ||
3c37026d RB |
749 | if (!simulate_rdhwr(regs)) |
750 | return; | |
751 | ||
1da177e4 LT |
752 | force_sig(SIGILL, current); |
753 | } | |
754 | ||
755 | asmlinkage void do_cpu(struct pt_regs *regs) | |
756 | { | |
757 | unsigned int cpid; | |
758 | ||
5323180d AN |
759 | die_if_kernel("do_cpu invoked from kernel context!", regs); |
760 | ||
1da177e4 LT |
761 | cpid = (regs->cp0_cause >> CAUSEB_CE) & 3; |
762 | ||
763 | switch (cpid) { | |
764 | case 0: | |
3c37026d RB |
765 | if (!cpu_has_llsc) |
766 | if (!simulate_llsc(regs)) | |
767 | return; | |
1da177e4 | 768 | |
3c37026d | 769 | if (!simulate_rdhwr(regs)) |
1da177e4 | 770 | return; |
3c37026d | 771 | |
1da177e4 LT |
772 | break; |
773 | ||
774 | case 1: | |
53dc8028 AN |
775 | if (used_math()) /* Using the FPU again. */ |
776 | own_fpu(1); | |
777 | else { /* First time FPU user. */ | |
1da177e4 LT |
778 | init_fpu(); |
779 | set_used_math(); | |
780 | } | |
781 | ||
5323180d | 782 | if (!raw_cpu_has_fpu) { |
e04582b7 | 783 | int sig; |
e04582b7 AN |
784 | sig = fpu_emulator_cop1Handler(regs, |
785 | ¤t->thread.fpu, 0); | |
1da177e4 LT |
786 | if (sig) |
787 | force_sig(sig, current); | |
f088fc84 RB |
788 | #ifdef CONFIG_MIPS_MT_FPAFF |
789 | else { | |
790 | /* | |
791 | * MIPS MT processors may have fewer FPU contexts | |
792 | * than CPU threads. If we've emulated more than | |
793 | * some threshold number of instructions, force | |
794 | * migration to a "CPU" that has FP support. | |
795 | */ | |
796 | if(mt_fpemul_threshold > 0 | |
797 | && ((current->thread.emulated_fp++ | |
798 | > mt_fpemul_threshold))) { | |
799 | /* | |
800 | * If there's no FPU present, or if the | |
801 | * application has already restricted | |
802 | * the allowed set to exclude any CPUs | |
803 | * with FPUs, we'll skip the procedure. | |
804 | */ | |
805 | if (cpus_intersects(current->cpus_allowed, | |
806 | mt_fpu_cpumask)) { | |
807 | cpumask_t tmask; | |
808 | ||
809 | cpus_and(tmask, | |
810 | current->thread.user_cpus_allowed, | |
811 | mt_fpu_cpumask); | |
812 | set_cpus_allowed(current, tmask); | |
813 | current->thread.mflags |= MF_FPUBOUND; | |
814 | } | |
815 | } | |
816 | } | |
817 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 LT |
820 | return; |
821 | ||
822 | case 2: | |
823 | case 3: | |
824 | break; | |
825 | } | |
826 | ||
827 | force_sig(SIGILL, current); | |
828 | } | |
829 | ||
830 | asmlinkage void do_mdmx(struct pt_regs *regs) | |
831 | { | |
832 | force_sig(SIGILL, current); | |
833 | } | |
834 | ||
835 | asmlinkage void do_watch(struct pt_regs *regs) | |
836 | { | |
837 | /* | |
838 | * We use the watch exception where available to detect stack | |
839 | * overflows. | |
840 | */ | |
841 | dump_tlb_all(); | |
842 | show_regs(regs); | |
843 | panic("Caught WATCH exception - probably caused by stack overflow."); | |
844 | } | |
845 | ||
846 | asmlinkage void do_mcheck(struct pt_regs *regs) | |
847 | { | |
cac4bcbc RB |
848 | const int field = 2 * sizeof(unsigned long); |
849 | int multi_match = regs->cp0_status & ST0_TS; | |
850 | ||
1da177e4 | 851 | show_regs(regs); |
cac4bcbc RB |
852 | |
853 | if (multi_match) { | |
854 | printk("Index : %0x\n", read_c0_index()); | |
855 | printk("Pagemask: %0x\n", read_c0_pagemask()); | |
856 | printk("EntryHi : %0*lx\n", field, read_c0_entryhi()); | |
857 | printk("EntryLo0: %0*lx\n", field, read_c0_entrylo0()); | |
858 | printk("EntryLo1: %0*lx\n", field, read_c0_entrylo1()); | |
859 | printk("\n"); | |
860 | dump_tlb_all(); | |
861 | } | |
862 | ||
863 | show_code((unsigned int *) regs->cp0_epc); | |
864 | ||
1da177e4 LT |
865 | /* |
866 | * Some chips may have other causes of machine check (e.g. SB1 | |
867 | * graduation timer) | |
868 | */ | |
869 | panic("Caught Machine Check exception - %scaused by multiple " | |
870 | "matching entries in the TLB.", | |
cac4bcbc | 871 | (multi_match) ? "" : "not "); |
1da177e4 LT |
872 | } |
873 | ||
340ee4b9 RB |
874 | asmlinkage void do_mt(struct pt_regs *regs) |
875 | { | |
41c594ab RB |
876 | int subcode; |
877 | ||
41c594ab RB |
878 | subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT) |
879 | >> VPECONTROL_EXCPT_SHIFT; | |
880 | switch (subcode) { | |
881 | case 0: | |
e35a5e35 | 882 | printk(KERN_DEBUG "Thread Underflow\n"); |
41c594ab RB |
883 | break; |
884 | case 1: | |
e35a5e35 | 885 | printk(KERN_DEBUG "Thread Overflow\n"); |
41c594ab RB |
886 | break; |
887 | case 2: | |
e35a5e35 | 888 | printk(KERN_DEBUG "Invalid YIELD Qualifier\n"); |
41c594ab RB |
889 | break; |
890 | case 3: | |
e35a5e35 | 891 | printk(KERN_DEBUG "Gating Storage Exception\n"); |
41c594ab RB |
892 | break; |
893 | case 4: | |
e35a5e35 | 894 | printk(KERN_DEBUG "YIELD Scheduler Exception\n"); |
41c594ab RB |
895 | break; |
896 | case 5: | |
e35a5e35 | 897 | printk(KERN_DEBUG "Gating Storage Schedulier Exception\n"); |
41c594ab RB |
898 | break; |
899 | default: | |
e35a5e35 | 900 | printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n", |
41c594ab RB |
901 | subcode); |
902 | break; | |
903 | } | |
340ee4b9 RB |
904 | die_if_kernel("MIPS MT Thread exception in kernel", regs); |
905 | ||
906 | force_sig(SIGILL, current); | |
907 | } | |
908 | ||
909 | ||
e50c0a8f RB |
910 | asmlinkage void do_dsp(struct pt_regs *regs) |
911 | { | |
912 | if (cpu_has_dsp) | |
913 | panic("Unexpected DSP exception\n"); | |
914 | ||
915 | force_sig(SIGILL, current); | |
916 | } | |
917 | ||
1da177e4 LT |
918 | asmlinkage void do_reserved(struct pt_regs *regs) |
919 | { | |
920 | /* | |
921 | * Game over - no way to handle this if it ever occurs. Most probably | |
922 | * caused by a new unknown cpu type or after another deadly | |
923 | * hard/software error. | |
924 | */ | |
925 | show_regs(regs); | |
926 | panic("Caught reserved exception %ld - should not happen.", | |
927 | (regs->cp0_cause & 0x7f) >> 2); | |
928 | } | |
929 | ||
930 | /* | |
931 | * Some MIPS CPUs can enable/disable for cache parity detection, but do | |
932 | * it different ways. | |
933 | */ | |
934 | static inline void parity_protection_init(void) | |
935 | { | |
936 | switch (current_cpu_data.cputype) { | |
937 | case CPU_24K: | |
98a41de9 | 938 | case CPU_34K: |
1da177e4 | 939 | case CPU_5KC: |
14f18b7f RB |
940 | write_c0_ecc(0x80000000); |
941 | back_to_back_c0_hazard(); | |
942 | /* Set the PE bit (bit 31) in the c0_errctl register. */ | |
943 | printk(KERN_INFO "Cache parity protection %sabled\n", | |
944 | (read_c0_ecc() & 0x80000000) ? "en" : "dis"); | |
1da177e4 LT |
945 | break; |
946 | case CPU_20KC: | |
947 | case CPU_25KF: | |
948 | /* Clear the DE bit (bit 16) in the c0_status register. */ | |
949 | printk(KERN_INFO "Enable cache parity protection for " | |
950 | "MIPS 20KC/25KF CPUs.\n"); | |
951 | clear_c0_status(ST0_DE); | |
952 | break; | |
953 | default: | |
954 | break; | |
955 | } | |
956 | } | |
957 | ||
958 | asmlinkage void cache_parity_error(void) | |
959 | { | |
960 | const int field = 2 * sizeof(unsigned long); | |
961 | unsigned int reg_val; | |
962 | ||
963 | /* For the moment, report the problem and hang. */ | |
964 | printk("Cache error exception:\n"); | |
965 | printk("cp0_errorepc == %0*lx\n", field, read_c0_errorepc()); | |
966 | reg_val = read_c0_cacheerr(); | |
967 | printk("c0_cacheerr == %08x\n", reg_val); | |
968 | ||
969 | printk("Decoded c0_cacheerr: %s cache fault in %s reference.\n", | |
970 | reg_val & (1<<30) ? "secondary" : "primary", | |
971 | reg_val & (1<<31) ? "data" : "insn"); | |
972 | printk("Error bits: %s%s%s%s%s%s%s\n", | |
973 | reg_val & (1<<29) ? "ED " : "", | |
974 | reg_val & (1<<28) ? "ET " : "", | |
975 | reg_val & (1<<26) ? "EE " : "", | |
976 | reg_val & (1<<25) ? "EB " : "", | |
977 | reg_val & (1<<24) ? "EI " : "", | |
978 | reg_val & (1<<23) ? "E1 " : "", | |
979 | reg_val & (1<<22) ? "E0 " : ""); | |
980 | printk("IDX: 0x%08x\n", reg_val & ((1<<22)-1)); | |
981 | ||
ec917c2c | 982 | #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) |
1da177e4 LT |
983 | if (reg_val & (1<<22)) |
984 | printk("DErrAddr0: 0x%0*lx\n", field, read_c0_derraddr0()); | |
985 | ||
986 | if (reg_val & (1<<23)) | |
987 | printk("DErrAddr1: 0x%0*lx\n", field, read_c0_derraddr1()); | |
988 | #endif | |
989 | ||
990 | panic("Can't handle the cache error!"); | |
991 | } | |
992 | ||
993 | /* | |
994 | * SDBBP EJTAG debug exception handler. | |
995 | * We skip the instruction and return to the next instruction. | |
996 | */ | |
997 | void ejtag_exception_handler(struct pt_regs *regs) | |
998 | { | |
999 | const int field = 2 * sizeof(unsigned long); | |
1000 | unsigned long depc, old_epc; | |
1001 | unsigned int debug; | |
1002 | ||
70ae6126 | 1003 | printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n"); |
1da177e4 LT |
1004 | depc = read_c0_depc(); |
1005 | debug = read_c0_debug(); | |
70ae6126 | 1006 | printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug); |
1da177e4 LT |
1007 | if (debug & 0x80000000) { |
1008 | /* | |
1009 | * In branch delay slot. | |
1010 | * We cheat a little bit here and use EPC to calculate the | |
1011 | * debug return address (DEPC). EPC is restored after the | |
1012 | * calculation. | |
1013 | */ | |
1014 | old_epc = regs->cp0_epc; | |
1015 | regs->cp0_epc = depc; | |
1016 | __compute_return_epc(regs); | |
1017 | depc = regs->cp0_epc; | |
1018 | regs->cp0_epc = old_epc; | |
1019 | } else | |
1020 | depc += 4; | |
1021 | write_c0_depc(depc); | |
1022 | ||
1023 | #if 0 | |
70ae6126 | 1024 | printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n"); |
1da177e4 LT |
1025 | write_c0_debug(debug | 0x100); |
1026 | #endif | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * NMI exception handler. | |
1031 | */ | |
1032 | void nmi_exception_handler(struct pt_regs *regs) | |
1033 | { | |
41c594ab RB |
1034 | #ifdef CONFIG_MIPS_MT_SMTC |
1035 | unsigned long dvpret = dvpe(); | |
1036 | bust_spinlocks(1); | |
1037 | printk("NMI taken!!!!\n"); | |
1038 | mips_mt_regdump(dvpret); | |
1039 | #else | |
1040 | bust_spinlocks(1); | |
1da177e4 | 1041 | printk("NMI taken!!!!\n"); |
41c594ab | 1042 | #endif /* CONFIG_MIPS_MT_SMTC */ |
1da177e4 LT |
1043 | die("NMI", regs); |
1044 | while(1) ; | |
1045 | } | |
1046 | ||
e01402b1 RB |
1047 | #define VECTORSPACING 0x100 /* for EI/VI mode */ |
1048 | ||
1049 | unsigned long ebase; | |
1da177e4 | 1050 | unsigned long exception_handlers[32]; |
e01402b1 | 1051 | unsigned long vi_handlers[64]; |
1da177e4 LT |
1052 | |
1053 | /* | |
1054 | * As a side effect of the way this is implemented we're limited | |
1055 | * to interrupt handlers in the address range from | |
1056 | * KSEG0 <= x < KSEG0 + 256mb on the Nevada. Oh well ... | |
1057 | */ | |
1058 | void *set_except_vector(int n, void *addr) | |
1059 | { | |
1060 | unsigned long handler = (unsigned long) addr; | |
1061 | unsigned long old_handler = exception_handlers[n]; | |
1062 | ||
1063 | exception_handlers[n] = handler; | |
1064 | if (n == 0 && cpu_has_divec) { | |
e01402b1 | 1065 | *(volatile u32 *)(ebase + 0x200) = 0x08000000 | |
1da177e4 | 1066 | (0x03ffffff & (handler >> 2)); |
e01402b1 RB |
1067 | flush_icache_range(ebase + 0x200, ebase + 0x204); |
1068 | } | |
1069 | return (void *)old_handler; | |
1070 | } | |
1071 | ||
f41ae0b2 | 1072 | #ifdef CONFIG_CPU_MIPSR2_SRS |
e01402b1 | 1073 | /* |
193dd2ce | 1074 | * MIPSR2 shadow register set allocation |
e01402b1 RB |
1075 | * FIXME: SMP... |
1076 | */ | |
1077 | ||
193dd2ce RB |
1078 | static struct shadow_registers { |
1079 | /* | |
1080 | * Number of shadow register sets supported | |
1081 | */ | |
1082 | unsigned long sr_supported; | |
1083 | /* | |
1084 | * Bitmap of allocated shadow registers | |
1085 | */ | |
1086 | unsigned long sr_allocated; | |
e01402b1 RB |
1087 | } shadow_registers; |
1088 | ||
bb12d612 | 1089 | static void mips_srs_init(void) |
e01402b1 | 1090 | { |
e01402b1 | 1091 | shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1; |
3ab0f40f | 1092 | printk(KERN_INFO "%ld MIPSR2 register sets available\n", |
7acb783e | 1093 | shadow_registers.sr_supported); |
e01402b1 | 1094 | shadow_registers.sr_allocated = 1; /* Set 0 used by kernel */ |
e01402b1 RB |
1095 | } |
1096 | ||
1097 | int mips_srs_max(void) | |
1098 | { | |
1099 | return shadow_registers.sr_supported; | |
1100 | } | |
1101 | ||
ff3eab2a | 1102 | int mips_srs_alloc(void) |
e01402b1 RB |
1103 | { |
1104 | struct shadow_registers *sr = &shadow_registers; | |
e01402b1 RB |
1105 | int set; |
1106 | ||
193dd2ce RB |
1107 | again: |
1108 | set = find_first_zero_bit(&sr->sr_allocated, sr->sr_supported); | |
1109 | if (set >= sr->sr_supported) | |
1110 | return -1; | |
e01402b1 | 1111 | |
193dd2ce RB |
1112 | if (test_and_set_bit(set, &sr->sr_allocated)) |
1113 | goto again; | |
e01402b1 | 1114 | |
193dd2ce | 1115 | return set; |
e01402b1 RB |
1116 | } |
1117 | ||
41c594ab | 1118 | void mips_srs_free(int set) |
e01402b1 RB |
1119 | { |
1120 | struct shadow_registers *sr = &shadow_registers; | |
e01402b1 | 1121 | |
193dd2ce | 1122 | clear_bit(set, &sr->sr_allocated); |
e01402b1 RB |
1123 | } |
1124 | ||
6ba07e59 AN |
1125 | static asmlinkage void do_default_vi(void) |
1126 | { | |
1127 | show_regs(get_irq_regs()); | |
1128 | panic("Caught unexpected vectored interrupt."); | |
1129 | } | |
1130 | ||
ef300e42 | 1131 | static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs) |
e01402b1 RB |
1132 | { |
1133 | unsigned long handler; | |
1134 | unsigned long old_handler = vi_handlers[n]; | |
1135 | u32 *w; | |
1136 | unsigned char *b; | |
1137 | ||
1138 | if (!cpu_has_veic && !cpu_has_vint) | |
1139 | BUG(); | |
1140 | ||
1141 | if (addr == NULL) { | |
1142 | handler = (unsigned long) do_default_vi; | |
1143 | srs = 0; | |
41c594ab | 1144 | } else |
e01402b1 RB |
1145 | handler = (unsigned long) addr; |
1146 | vi_handlers[n] = (unsigned long) addr; | |
1147 | ||
1148 | b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING); | |
1149 | ||
1150 | if (srs >= mips_srs_max()) | |
1151 | panic("Shadow register set %d not supported", srs); | |
1152 | ||
1153 | if (cpu_has_veic) { | |
1154 | if (board_bind_eic_interrupt) | |
1155 | board_bind_eic_interrupt (n, srs); | |
41c594ab | 1156 | } else if (cpu_has_vint) { |
e01402b1 RB |
1157 | /* SRSMap is only defined if shadow sets are implemented */ |
1158 | if (mips_srs_max() > 1) | |
1159 | change_c0_srsmap (0xf << n*4, srs << n*4); | |
1160 | } | |
1161 | ||
1162 | if (srs == 0) { | |
1163 | /* | |
1164 | * If no shadow set is selected then use the default handler | |
1165 | * that does normal register saving and a standard interrupt exit | |
1166 | */ | |
1167 | ||
1168 | extern char except_vec_vi, except_vec_vi_lui; | |
1169 | extern char except_vec_vi_ori, except_vec_vi_end; | |
41c594ab RB |
1170 | #ifdef CONFIG_MIPS_MT_SMTC |
1171 | /* | |
1172 | * We need to provide the SMTC vectored interrupt handler | |
1173 | * not only with the address of the handler, but with the | |
1174 | * Status.IM bit to be masked before going there. | |
1175 | */ | |
1176 | extern char except_vec_vi_mori; | |
1177 | const int mori_offset = &except_vec_vi_mori - &except_vec_vi; | |
1178 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
e01402b1 RB |
1179 | const int handler_len = &except_vec_vi_end - &except_vec_vi; |
1180 | const int lui_offset = &except_vec_vi_lui - &except_vec_vi; | |
1181 | const int ori_offset = &except_vec_vi_ori - &except_vec_vi; | |
1182 | ||
1183 | if (handler_len > VECTORSPACING) { | |
1184 | /* | |
1185 | * Sigh... panicing won't help as the console | |
1186 | * is probably not configured :( | |
1187 | */ | |
1188 | panic ("VECTORSPACING too small"); | |
1189 | } | |
1190 | ||
1191 | memcpy (b, &except_vec_vi, handler_len); | |
41c594ab RB |
1192 | #ifdef CONFIG_MIPS_MT_SMTC |
1193 | if (n > 7) | |
1194 | printk("Vector index %d exceeds SMTC maximum\n", n); | |
1195 | w = (u32 *)(b + mori_offset); | |
1196 | *w = (*w & 0xffff0000) | (0x100 << n); | |
1197 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
e01402b1 RB |
1198 | w = (u32 *)(b + lui_offset); |
1199 | *w = (*w & 0xffff0000) | (((u32)handler >> 16) & 0xffff); | |
1200 | w = (u32 *)(b + ori_offset); | |
1201 | *w = (*w & 0xffff0000) | ((u32)handler & 0xffff); | |
1202 | flush_icache_range((unsigned long)b, (unsigned long)(b+handler_len)); | |
1203 | } | |
1204 | else { | |
1205 | /* | |
1206 | * In other cases jump directly to the interrupt handler | |
1207 | * | |
1208 | * It is the handlers responsibility to save registers if required | |
1209 | * (eg hi/lo) and return from the exception using "eret" | |
1210 | */ | |
1211 | w = (u32 *)b; | |
1212 | *w++ = 0x08000000 | (((u32)handler >> 2) & 0x03fffff); /* j handler */ | |
1213 | *w = 0; | |
1214 | flush_icache_range((unsigned long)b, (unsigned long)(b+8)); | |
1da177e4 | 1215 | } |
e01402b1 | 1216 | |
1da177e4 LT |
1217 | return (void *)old_handler; |
1218 | } | |
1219 | ||
ef300e42 | 1220 | void *set_vi_handler(int n, vi_handler_t addr) |
e01402b1 | 1221 | { |
ff3eab2a | 1222 | return set_vi_srs_handler(n, addr, 0); |
e01402b1 | 1223 | } |
f41ae0b2 RB |
1224 | |
1225 | #else | |
1226 | ||
1227 | static inline void mips_srs_init(void) | |
1228 | { | |
1229 | } | |
1230 | ||
1231 | #endif /* CONFIG_CPU_MIPSR2_SRS */ | |
e01402b1 | 1232 | |
1da177e4 LT |
1233 | /* |
1234 | * This is used by native signal handling | |
1235 | */ | |
53dc8028 AN |
1236 | asmlinkage int (*save_fp_context)(struct sigcontext __user *sc); |
1237 | asmlinkage int (*restore_fp_context)(struct sigcontext __user *sc); | |
1da177e4 | 1238 | |
53dc8028 AN |
1239 | extern asmlinkage int _save_fp_context(struct sigcontext __user *sc); |
1240 | extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc); | |
1da177e4 | 1241 | |
53dc8028 AN |
1242 | extern asmlinkage int fpu_emulator_save_context(struct sigcontext __user *sc); |
1243 | extern asmlinkage int fpu_emulator_restore_context(struct sigcontext __user *sc); | |
1da177e4 | 1244 | |
41c594ab | 1245 | #ifdef CONFIG_SMP |
53dc8028 | 1246 | static int smp_save_fp_context(struct sigcontext __user *sc) |
41c594ab | 1247 | { |
53dc8028 | 1248 | return raw_cpu_has_fpu |
41c594ab RB |
1249 | ? _save_fp_context(sc) |
1250 | : fpu_emulator_save_context(sc); | |
1251 | } | |
1252 | ||
53dc8028 | 1253 | static int smp_restore_fp_context(struct sigcontext __user *sc) |
41c594ab | 1254 | { |
53dc8028 | 1255 | return raw_cpu_has_fpu |
41c594ab RB |
1256 | ? _restore_fp_context(sc) |
1257 | : fpu_emulator_restore_context(sc); | |
1258 | } | |
1259 | #endif | |
1260 | ||
1da177e4 LT |
1261 | static inline void signal_init(void) |
1262 | { | |
41c594ab RB |
1263 | #ifdef CONFIG_SMP |
1264 | /* For now just do the cpu_has_fpu check when the functions are invoked */ | |
1265 | save_fp_context = smp_save_fp_context; | |
1266 | restore_fp_context = smp_restore_fp_context; | |
1267 | #else | |
1da177e4 LT |
1268 | if (cpu_has_fpu) { |
1269 | save_fp_context = _save_fp_context; | |
1270 | restore_fp_context = _restore_fp_context; | |
1271 | } else { | |
1272 | save_fp_context = fpu_emulator_save_context; | |
1273 | restore_fp_context = fpu_emulator_restore_context; | |
1274 | } | |
41c594ab | 1275 | #endif |
1da177e4 LT |
1276 | } |
1277 | ||
1278 | #ifdef CONFIG_MIPS32_COMPAT | |
1279 | ||
1280 | /* | |
1281 | * This is used by 32-bit signal stuff on the 64-bit kernel | |
1282 | */ | |
53dc8028 AN |
1283 | asmlinkage int (*save_fp_context32)(struct sigcontext32 __user *sc); |
1284 | asmlinkage int (*restore_fp_context32)(struct sigcontext32 __user *sc); | |
1da177e4 | 1285 | |
53dc8028 AN |
1286 | extern asmlinkage int _save_fp_context32(struct sigcontext32 __user *sc); |
1287 | extern asmlinkage int _restore_fp_context32(struct sigcontext32 __user *sc); | |
1da177e4 | 1288 | |
53dc8028 AN |
1289 | extern asmlinkage int fpu_emulator_save_context32(struct sigcontext32 __user *sc); |
1290 | extern asmlinkage int fpu_emulator_restore_context32(struct sigcontext32 __user *sc); | |
1da177e4 LT |
1291 | |
1292 | static inline void signal32_init(void) | |
1293 | { | |
1294 | if (cpu_has_fpu) { | |
1295 | save_fp_context32 = _save_fp_context32; | |
1296 | restore_fp_context32 = _restore_fp_context32; | |
1297 | } else { | |
1298 | save_fp_context32 = fpu_emulator_save_context32; | |
1299 | restore_fp_context32 = fpu_emulator_restore_context32; | |
1300 | } | |
1301 | } | |
1302 | #endif | |
1303 | ||
1304 | extern void cpu_cache_init(void); | |
1305 | extern void tlb_init(void); | |
1d40cfcd | 1306 | extern void flush_tlb_handlers(void); |
1da177e4 LT |
1307 | |
1308 | void __init per_cpu_trap_init(void) | |
1309 | { | |
1310 | unsigned int cpu = smp_processor_id(); | |
1311 | unsigned int status_set = ST0_CU0; | |
41c594ab RB |
1312 | #ifdef CONFIG_MIPS_MT_SMTC |
1313 | int secondaryTC = 0; | |
1314 | int bootTC = (cpu == 0); | |
1315 | ||
1316 | /* | |
1317 | * Only do per_cpu_trap_init() for first TC of Each VPE. | |
1318 | * Note that this hack assumes that the SMTC init code | |
1319 | * assigns TCs consecutively and in ascending order. | |
1320 | */ | |
1321 | ||
1322 | if (((read_c0_tcbind() & TCBIND_CURTC) != 0) && | |
1323 | ((read_c0_tcbind() & TCBIND_CURVPE) == cpu_data[cpu - 1].vpe_id)) | |
1324 | secondaryTC = 1; | |
1325 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1326 | |
1327 | /* | |
1328 | * Disable coprocessors and select 32-bit or 64-bit addressing | |
1329 | * and the 16/32 or 32/32 FPR register model. Reset the BEV | |
1330 | * flag that some firmware may have left set and the TS bit (for | |
1331 | * IP27). Set XX for ISA IV code to work. | |
1332 | */ | |
875d43e7 | 1333 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1334 | status_set |= ST0_FR|ST0_KX|ST0_SX|ST0_UX; |
1335 | #endif | |
1336 | if (current_cpu_data.isa_level == MIPS_CPU_ISA_IV) | |
1337 | status_set |= ST0_XX; | |
b38c7399 | 1338 | change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX, |
1da177e4 LT |
1339 | status_set); |
1340 | ||
e50c0a8f RB |
1341 | if (cpu_has_dsp) |
1342 | set_c0_status(ST0_MX); | |
1343 | ||
e01402b1 RB |
1344 | #ifdef CONFIG_CPU_MIPSR2 |
1345 | write_c0_hwrena (0x0000000f); /* Allow rdhwr to all registers */ | |
1346 | #endif | |
1347 | ||
41c594ab RB |
1348 | #ifdef CONFIG_MIPS_MT_SMTC |
1349 | if (!secondaryTC) { | |
1350 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1351 | ||
1da177e4 | 1352 | /* |
e01402b1 | 1353 | * Interrupt handling. |
1da177e4 | 1354 | */ |
e01402b1 RB |
1355 | if (cpu_has_veic || cpu_has_vint) { |
1356 | write_c0_ebase (ebase); | |
1357 | /* Setting vector spacing enables EI/VI mode */ | |
1358 | change_c0_intctl (0x3e0, VECTORSPACING); | |
1359 | } | |
d03d0a57 RB |
1360 | if (cpu_has_divec) { |
1361 | if (cpu_has_mipsmt) { | |
1362 | unsigned int vpflags = dvpe(); | |
1363 | set_c0_cause(CAUSEF_IV); | |
1364 | evpe(vpflags); | |
1365 | } else | |
1366 | set_c0_cause(CAUSEF_IV); | |
1367 | } | |
41c594ab RB |
1368 | #ifdef CONFIG_MIPS_MT_SMTC |
1369 | } | |
1370 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1371 | |
1372 | cpu_data[cpu].asid_cache = ASID_FIRST_VERSION; | |
1373 | TLBMISS_HANDLER_SETUP(); | |
1374 | ||
1375 | atomic_inc(&init_mm.mm_count); | |
1376 | current->active_mm = &init_mm; | |
1377 | BUG_ON(current->mm); | |
1378 | enter_lazy_tlb(&init_mm, current); | |
1379 | ||
41c594ab RB |
1380 | #ifdef CONFIG_MIPS_MT_SMTC |
1381 | if (bootTC) { | |
1382 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1383 | cpu_cache_init(); | |
1384 | tlb_init(); | |
1385 | #ifdef CONFIG_MIPS_MT_SMTC | |
1386 | } | |
1387 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1388 | } |
1389 | ||
e01402b1 RB |
1390 | /* Install CPU exception handler */ |
1391 | void __init set_handler (unsigned long offset, void *addr, unsigned long size) | |
1392 | { | |
1393 | memcpy((void *)(ebase + offset), addr, size); | |
1394 | flush_icache_range(ebase + offset, ebase + offset + size); | |
1395 | } | |
1396 | ||
1397 | /* Install uncached CPU exception handler */ | |
1398 | void __init set_uncached_handler (unsigned long offset, void *addr, unsigned long size) | |
1399 | { | |
1400 | #ifdef CONFIG_32BIT | |
1401 | unsigned long uncached_ebase = KSEG1ADDR(ebase); | |
1402 | #endif | |
1403 | #ifdef CONFIG_64BIT | |
1404 | unsigned long uncached_ebase = TO_UNCAC(ebase); | |
1405 | #endif | |
1406 | ||
1407 | memcpy((void *)(uncached_ebase + offset), addr, size); | |
1408 | } | |
1409 | ||
5b10496b AN |
1410 | static int __initdata rdhwr_noopt; |
1411 | static int __init set_rdhwr_noopt(char *str) | |
1412 | { | |
1413 | rdhwr_noopt = 1; | |
1414 | return 1; | |
1415 | } | |
1416 | ||
1417 | __setup("rdhwr_noopt", set_rdhwr_noopt); | |
1418 | ||
1da177e4 LT |
1419 | void __init trap_init(void) |
1420 | { | |
1421 | extern char except_vec3_generic, except_vec3_r4000; | |
1da177e4 LT |
1422 | extern char except_vec4; |
1423 | unsigned long i; | |
1424 | ||
e01402b1 RB |
1425 | if (cpu_has_veic || cpu_has_vint) |
1426 | ebase = (unsigned long) alloc_bootmem_low_pages (0x200 + VECTORSPACING*64); | |
1427 | else | |
1428 | ebase = CAC_BASE; | |
1429 | ||
e01402b1 | 1430 | mips_srs_init(); |
e01402b1 | 1431 | |
1da177e4 LT |
1432 | per_cpu_trap_init(); |
1433 | ||
1434 | /* | |
1435 | * Copy the generic exception handlers to their final destination. | |
1436 | * This will be overriden later as suitable for a particular | |
1437 | * configuration. | |
1438 | */ | |
e01402b1 | 1439 | set_handler(0x180, &except_vec3_generic, 0x80); |
1da177e4 LT |
1440 | |
1441 | /* | |
1442 | * Setup default vectors | |
1443 | */ | |
1444 | for (i = 0; i <= 31; i++) | |
1445 | set_except_vector(i, handle_reserved); | |
1446 | ||
1447 | /* | |
1448 | * Copy the EJTAG debug exception vector handler code to it's final | |
1449 | * destination. | |
1450 | */ | |
e01402b1 RB |
1451 | if (cpu_has_ejtag && board_ejtag_handler_setup) |
1452 | board_ejtag_handler_setup (); | |
1da177e4 LT |
1453 | |
1454 | /* | |
1455 | * Only some CPUs have the watch exceptions. | |
1456 | */ | |
1457 | if (cpu_has_watch) | |
1458 | set_except_vector(23, handle_watch); | |
1459 | ||
1460 | /* | |
e01402b1 | 1461 | * Initialise interrupt handlers |
1da177e4 | 1462 | */ |
e01402b1 RB |
1463 | if (cpu_has_veic || cpu_has_vint) { |
1464 | int nvec = cpu_has_veic ? 64 : 8; | |
1465 | for (i = 0; i < nvec; i++) | |
ff3eab2a | 1466 | set_vi_handler(i, NULL); |
e01402b1 RB |
1467 | } |
1468 | else if (cpu_has_divec) | |
1469 | set_handler(0x200, &except_vec4, 0x8); | |
1da177e4 LT |
1470 | |
1471 | /* | |
1472 | * Some CPUs can enable/disable for cache parity detection, but does | |
1473 | * it different ways. | |
1474 | */ | |
1475 | parity_protection_init(); | |
1476 | ||
1477 | /* | |
1478 | * The Data Bus Errors / Instruction Bus Errors are signaled | |
1479 | * by external hardware. Therefore these two exceptions | |
1480 | * may have board specific handlers. | |
1481 | */ | |
1482 | if (board_be_init) | |
1483 | board_be_init(); | |
1484 | ||
e4ac58af | 1485 | set_except_vector(0, handle_int); |
1da177e4 LT |
1486 | set_except_vector(1, handle_tlbm); |
1487 | set_except_vector(2, handle_tlbl); | |
1488 | set_except_vector(3, handle_tlbs); | |
1489 | ||
1490 | set_except_vector(4, handle_adel); | |
1491 | set_except_vector(5, handle_ades); | |
1492 | ||
1493 | set_except_vector(6, handle_ibe); | |
1494 | set_except_vector(7, handle_dbe); | |
1495 | ||
1496 | set_except_vector(8, handle_sys); | |
1497 | set_except_vector(9, handle_bp); | |
5b10496b AN |
1498 | set_except_vector(10, rdhwr_noopt ? handle_ri : |
1499 | (cpu_has_vtag_icache ? | |
1500 | handle_ri_rdhwr_vivt : handle_ri_rdhwr)); | |
1da177e4 LT |
1501 | set_except_vector(11, handle_cpu); |
1502 | set_except_vector(12, handle_ov); | |
1503 | set_except_vector(13, handle_tr); | |
1da177e4 LT |
1504 | |
1505 | if (current_cpu_data.cputype == CPU_R6000 || | |
1506 | current_cpu_data.cputype == CPU_R6000A) { | |
1507 | /* | |
1508 | * The R6000 is the only R-series CPU that features a machine | |
1509 | * check exception (similar to the R4000 cache error) and | |
1510 | * unaligned ldc1/sdc1 exception. The handlers have not been | |
1511 | * written yet. Well, anyway there is no R6000 machine on the | |
1512 | * current list of targets for Linux/MIPS. | |
1513 | * (Duh, crap, there is someone with a triple R6k machine) | |
1514 | */ | |
1515 | //set_except_vector(14, handle_mc); | |
1516 | //set_except_vector(15, handle_ndc); | |
1517 | } | |
1518 | ||
e01402b1 RB |
1519 | |
1520 | if (board_nmi_handler_setup) | |
1521 | board_nmi_handler_setup(); | |
1522 | ||
e50c0a8f RB |
1523 | if (cpu_has_fpu && !cpu_has_nofpuex) |
1524 | set_except_vector(15, handle_fpe); | |
1525 | ||
1526 | set_except_vector(22, handle_mdmx); | |
1527 | ||
1528 | if (cpu_has_mcheck) | |
1529 | set_except_vector(24, handle_mcheck); | |
1530 | ||
340ee4b9 RB |
1531 | if (cpu_has_mipsmt) |
1532 | set_except_vector(25, handle_mt); | |
1533 | ||
acaec427 | 1534 | set_except_vector(26, handle_dsp); |
e50c0a8f RB |
1535 | |
1536 | if (cpu_has_vce) | |
1537 | /* Special exception: R4[04]00 uses also the divec space. */ | |
1538 | memcpy((void *)(CAC_BASE + 0x180), &except_vec3_r4000, 0x100); | |
1539 | else if (cpu_has_4kex) | |
1540 | memcpy((void *)(CAC_BASE + 0x180), &except_vec3_generic, 0x80); | |
1541 | else | |
1542 | memcpy((void *)(CAC_BASE + 0x080), &except_vec3_generic, 0x80); | |
1543 | ||
1da177e4 LT |
1544 | signal_init(); |
1545 | #ifdef CONFIG_MIPS32_COMPAT | |
1546 | signal32_init(); | |
1547 | #endif | |
1548 | ||
e01402b1 | 1549 | flush_icache_range(ebase, ebase + 0x400); |
1d40cfcd | 1550 | flush_tlb_handlers(); |
1da177e4 | 1551 | } |