Commit | Line | Data |
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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. | |
60b0d655 | 12 | * Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki |
1da177e4 | 13 | */ |
8e8a52ed | 14 | #include <linux/bug.h> |
60b0d655 | 15 | #include <linux/compiler.h> |
1da177e4 LT |
16 | #include <linux/init.h> |
17 | #include <linux/mm.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/smp.h> | |
1da177e4 LT |
21 | #include <linux/spinlock.h> |
22 | #include <linux/kallsyms.h> | |
e01402b1 | 23 | #include <linux/bootmem.h> |
d4fd1989 | 24 | #include <linux/interrupt.h> |
39b8d525 | 25 | #include <linux/ptrace.h> |
88547001 JW |
26 | #include <linux/kgdb.h> |
27 | #include <linux/kdebug.h> | |
69f3a7de | 28 | #include <linux/notifier.h> |
1da177e4 LT |
29 | |
30 | #include <asm/bootinfo.h> | |
31 | #include <asm/branch.h> | |
32 | #include <asm/break.h> | |
69f3a7de | 33 | #include <asm/cop2.h> |
1da177e4 | 34 | #include <asm/cpu.h> |
e50c0a8f | 35 | #include <asm/dsp.h> |
1da177e4 | 36 | #include <asm/fpu.h> |
ba3049ed | 37 | #include <asm/fpu_emulator.h> |
340ee4b9 RB |
38 | #include <asm/mipsregs.h> |
39 | #include <asm/mipsmtregs.h> | |
1da177e4 LT |
40 | #include <asm/module.h> |
41 | #include <asm/pgtable.h> | |
42 | #include <asm/ptrace.h> | |
43 | #include <asm/sections.h> | |
44 | #include <asm/system.h> | |
45 | #include <asm/tlbdebug.h> | |
46 | #include <asm/traps.h> | |
47 | #include <asm/uaccess.h> | |
b67b2b70 | 48 | #include <asm/watch.h> |
1da177e4 | 49 | #include <asm/mmu_context.h> |
1da177e4 | 50 | #include <asm/types.h> |
1df0f0ff | 51 | #include <asm/stacktrace.h> |
f9bb4cf3 | 52 | #include <asm/irq.h> |
92bbe1b9 | 53 | #include <asm/uasm.h> |
1da177e4 | 54 | |
c65a5480 AN |
55 | extern void check_wait(void); |
56 | extern asmlinkage void r4k_wait(void); | |
57 | extern asmlinkage void rollback_handle_int(void); | |
e4ac58af | 58 | extern asmlinkage void handle_int(void); |
1da177e4 LT |
59 | extern asmlinkage void handle_tlbm(void); |
60 | extern asmlinkage void handle_tlbl(void); | |
61 | extern asmlinkage void handle_tlbs(void); | |
62 | extern asmlinkage void handle_adel(void); | |
63 | extern asmlinkage void handle_ades(void); | |
64 | extern asmlinkage void handle_ibe(void); | |
65 | extern asmlinkage void handle_dbe(void); | |
66 | extern asmlinkage void handle_sys(void); | |
67 | extern asmlinkage void handle_bp(void); | |
68 | extern asmlinkage void handle_ri(void); | |
5b10496b AN |
69 | extern asmlinkage void handle_ri_rdhwr_vivt(void); |
70 | extern asmlinkage void handle_ri_rdhwr(void); | |
1da177e4 LT |
71 | extern asmlinkage void handle_cpu(void); |
72 | extern asmlinkage void handle_ov(void); | |
73 | extern asmlinkage void handle_tr(void); | |
74 | extern asmlinkage void handle_fpe(void); | |
75 | extern asmlinkage void handle_mdmx(void); | |
76 | extern asmlinkage void handle_watch(void); | |
340ee4b9 | 77 | extern asmlinkage void handle_mt(void); |
e50c0a8f | 78 | extern asmlinkage void handle_dsp(void); |
1da177e4 LT |
79 | extern asmlinkage void handle_mcheck(void); |
80 | extern asmlinkage void handle_reserved(void); | |
81 | ||
12616ed2 | 82 | extern int fpu_emulator_cop1Handler(struct pt_regs *xcp, |
e04582b7 | 83 | struct mips_fpu_struct *ctx, int has_fpu); |
1da177e4 LT |
84 | |
85 | void (*board_be_init)(void); | |
86 | int (*board_be_handler)(struct pt_regs *regs, int is_fixup); | |
e01402b1 RB |
87 | void (*board_nmi_handler_setup)(void); |
88 | void (*board_ejtag_handler_setup)(void); | |
89 | void (*board_bind_eic_interrupt)(int irq, int regset); | |
1da177e4 | 90 | |
1da177e4 | 91 | |
4d157d5e | 92 | static void show_raw_backtrace(unsigned long reg29) |
e889d78f | 93 | { |
39b8d525 | 94 | unsigned long *sp = (unsigned long *)(reg29 & ~3); |
e889d78f AN |
95 | unsigned long addr; |
96 | ||
97 | printk("Call Trace:"); | |
98 | #ifdef CONFIG_KALLSYMS | |
99 | printk("\n"); | |
100 | #endif | |
10220c88 TB |
101 | while (!kstack_end(sp)) { |
102 | unsigned long __user *p = | |
103 | (unsigned long __user *)(unsigned long)sp++; | |
104 | if (__get_user(addr, p)) { | |
105 | printk(" (Bad stack address)"); | |
106 | break; | |
39b8d525 | 107 | } |
10220c88 TB |
108 | if (__kernel_text_address(addr)) |
109 | print_ip_sym(addr); | |
e889d78f | 110 | } |
10220c88 | 111 | printk("\n"); |
e889d78f AN |
112 | } |
113 | ||
f66686f7 | 114 | #ifdef CONFIG_KALLSYMS |
1df0f0ff | 115 | int raw_show_trace; |
f66686f7 AN |
116 | static int __init set_raw_show_trace(char *str) |
117 | { | |
118 | raw_show_trace = 1; | |
119 | return 1; | |
120 | } | |
121 | __setup("raw_show_trace", set_raw_show_trace); | |
1df0f0ff | 122 | #endif |
4d157d5e | 123 | |
eae23f2c | 124 | static void show_backtrace(struct task_struct *task, const struct pt_regs *regs) |
f66686f7 | 125 | { |
4d157d5e FBH |
126 | unsigned long sp = regs->regs[29]; |
127 | unsigned long ra = regs->regs[31]; | |
f66686f7 | 128 | unsigned long pc = regs->cp0_epc; |
f66686f7 AN |
129 | |
130 | if (raw_show_trace || !__kernel_text_address(pc)) { | |
87151ae3 | 131 | show_raw_backtrace(sp); |
f66686f7 AN |
132 | return; |
133 | } | |
134 | printk("Call Trace:\n"); | |
4d157d5e | 135 | do { |
87151ae3 | 136 | print_ip_sym(pc); |
1924600c | 137 | pc = unwind_stack(task, &sp, pc, &ra); |
4d157d5e | 138 | } while (pc); |
f66686f7 AN |
139 | printk("\n"); |
140 | } | |
f66686f7 | 141 | |
1da177e4 LT |
142 | /* |
143 | * This routine abuses get_user()/put_user() to reference pointers | |
144 | * with at least a bit of error checking ... | |
145 | */ | |
eae23f2c RB |
146 | static void show_stacktrace(struct task_struct *task, |
147 | const struct pt_regs *regs) | |
1da177e4 LT |
148 | { |
149 | const int field = 2 * sizeof(unsigned long); | |
150 | long stackdata; | |
151 | int i; | |
5e0373b8 | 152 | unsigned long __user *sp = (unsigned long __user *)regs->regs[29]; |
1da177e4 LT |
153 | |
154 | printk("Stack :"); | |
155 | i = 0; | |
156 | while ((unsigned long) sp & (PAGE_SIZE - 1)) { | |
157 | if (i && ((i % (64 / field)) == 0)) | |
158 | printk("\n "); | |
159 | if (i > 39) { | |
160 | printk(" ..."); | |
161 | break; | |
162 | } | |
163 | ||
164 | if (__get_user(stackdata, sp++)) { | |
165 | printk(" (Bad stack address)"); | |
166 | break; | |
167 | } | |
168 | ||
169 | printk(" %0*lx", field, stackdata); | |
170 | i++; | |
171 | } | |
172 | printk("\n"); | |
87151ae3 | 173 | show_backtrace(task, regs); |
f66686f7 AN |
174 | } |
175 | ||
f66686f7 AN |
176 | void show_stack(struct task_struct *task, unsigned long *sp) |
177 | { | |
178 | struct pt_regs regs; | |
179 | if (sp) { | |
180 | regs.regs[29] = (unsigned long)sp; | |
181 | regs.regs[31] = 0; | |
182 | regs.cp0_epc = 0; | |
183 | } else { | |
184 | if (task && task != current) { | |
185 | regs.regs[29] = task->thread.reg29; | |
186 | regs.regs[31] = 0; | |
187 | regs.cp0_epc = task->thread.reg31; | |
188 | } else { | |
189 | prepare_frametrace(®s); | |
190 | } | |
191 | } | |
192 | show_stacktrace(task, ®s); | |
1da177e4 LT |
193 | } |
194 | ||
195 | /* | |
196 | * The architecture-independent dump_stack generator | |
197 | */ | |
198 | void dump_stack(void) | |
199 | { | |
1666a6fc | 200 | struct pt_regs regs; |
1da177e4 | 201 | |
1666a6fc FBH |
202 | prepare_frametrace(®s); |
203 | show_backtrace(current, ®s); | |
1da177e4 LT |
204 | } |
205 | ||
206 | EXPORT_SYMBOL(dump_stack); | |
207 | ||
e1bb8289 | 208 | static void show_code(unsigned int __user *pc) |
1da177e4 LT |
209 | { |
210 | long i; | |
39b8d525 | 211 | unsigned short __user *pc16 = NULL; |
1da177e4 LT |
212 | |
213 | printk("\nCode:"); | |
214 | ||
39b8d525 RB |
215 | if ((unsigned long)pc & 1) |
216 | pc16 = (unsigned short __user *)((unsigned long)pc & ~1); | |
1da177e4 LT |
217 | for(i = -3 ; i < 6 ; i++) { |
218 | unsigned int insn; | |
39b8d525 | 219 | if (pc16 ? __get_user(insn, pc16 + i) : __get_user(insn, pc + i)) { |
1da177e4 LT |
220 | printk(" (Bad address in epc)\n"); |
221 | break; | |
222 | } | |
39b8d525 | 223 | printk("%c%0*x%c", (i?' ':'<'), pc16 ? 4 : 8, insn, (i?' ':'>')); |
1da177e4 LT |
224 | } |
225 | } | |
226 | ||
eae23f2c | 227 | static void __show_regs(const struct pt_regs *regs) |
1da177e4 LT |
228 | { |
229 | const int field = 2 * sizeof(unsigned long); | |
230 | unsigned int cause = regs->cp0_cause; | |
231 | int i; | |
232 | ||
233 | printk("Cpu %d\n", smp_processor_id()); | |
234 | ||
235 | /* | |
236 | * Saved main processor registers | |
237 | */ | |
238 | for (i = 0; i < 32; ) { | |
239 | if ((i % 4) == 0) | |
240 | printk("$%2d :", i); | |
241 | if (i == 0) | |
242 | printk(" %0*lx", field, 0UL); | |
243 | else if (i == 26 || i == 27) | |
244 | printk(" %*s", field, ""); | |
245 | else | |
246 | printk(" %0*lx", field, regs->regs[i]); | |
247 | ||
248 | i++; | |
249 | if ((i % 4) == 0) | |
250 | printk("\n"); | |
251 | } | |
252 | ||
9693a853 FBH |
253 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
254 | printk("Acx : %0*lx\n", field, regs->acx); | |
255 | #endif | |
1da177e4 LT |
256 | printk("Hi : %0*lx\n", field, regs->hi); |
257 | printk("Lo : %0*lx\n", field, regs->lo); | |
258 | ||
259 | /* | |
260 | * Saved cp0 registers | |
261 | */ | |
b012cffe RB |
262 | printk("epc : %0*lx %pS\n", field, regs->cp0_epc, |
263 | (void *) regs->cp0_epc); | |
1da177e4 | 264 | printk(" %s\n", print_tainted()); |
b012cffe RB |
265 | printk("ra : %0*lx %pS\n", field, regs->regs[31], |
266 | (void *) regs->regs[31]); | |
1da177e4 LT |
267 | |
268 | printk("Status: %08x ", (uint32_t) regs->cp0_status); | |
269 | ||
3b2396d9 MR |
270 | if (current_cpu_data.isa_level == MIPS_CPU_ISA_I) { |
271 | if (regs->cp0_status & ST0_KUO) | |
272 | printk("KUo "); | |
273 | if (regs->cp0_status & ST0_IEO) | |
274 | printk("IEo "); | |
275 | if (regs->cp0_status & ST0_KUP) | |
276 | printk("KUp "); | |
277 | if (regs->cp0_status & ST0_IEP) | |
278 | printk("IEp "); | |
279 | if (regs->cp0_status & ST0_KUC) | |
280 | printk("KUc "); | |
281 | if (regs->cp0_status & ST0_IEC) | |
282 | printk("IEc "); | |
283 | } else { | |
284 | if (regs->cp0_status & ST0_KX) | |
285 | printk("KX "); | |
286 | if (regs->cp0_status & ST0_SX) | |
287 | printk("SX "); | |
288 | if (regs->cp0_status & ST0_UX) | |
289 | printk("UX "); | |
290 | switch (regs->cp0_status & ST0_KSU) { | |
291 | case KSU_USER: | |
292 | printk("USER "); | |
293 | break; | |
294 | case KSU_SUPERVISOR: | |
295 | printk("SUPERVISOR "); | |
296 | break; | |
297 | case KSU_KERNEL: | |
298 | printk("KERNEL "); | |
299 | break; | |
300 | default: | |
301 | printk("BAD_MODE "); | |
302 | break; | |
303 | } | |
304 | if (regs->cp0_status & ST0_ERL) | |
305 | printk("ERL "); | |
306 | if (regs->cp0_status & ST0_EXL) | |
307 | printk("EXL "); | |
308 | if (regs->cp0_status & ST0_IE) | |
309 | printk("IE "); | |
1da177e4 | 310 | } |
1da177e4 LT |
311 | printk("\n"); |
312 | ||
313 | printk("Cause : %08x\n", cause); | |
314 | ||
315 | cause = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE; | |
316 | if (1 <= cause && cause <= 5) | |
317 | printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr); | |
318 | ||
9966db25 RB |
319 | printk("PrId : %08x (%s)\n", read_c0_prid(), |
320 | cpu_name_string()); | |
1da177e4 LT |
321 | } |
322 | ||
eae23f2c RB |
323 | /* |
324 | * FIXME: really the generic show_regs should take a const pointer argument. | |
325 | */ | |
326 | void show_regs(struct pt_regs *regs) | |
327 | { | |
328 | __show_regs((struct pt_regs *)regs); | |
329 | } | |
330 | ||
331 | void show_registers(const struct pt_regs *regs) | |
1da177e4 | 332 | { |
39b8d525 RB |
333 | const int field = 2 * sizeof(unsigned long); |
334 | ||
eae23f2c | 335 | __show_regs(regs); |
1da177e4 | 336 | print_modules(); |
39b8d525 RB |
337 | printk("Process %s (pid: %d, threadinfo=%p, task=%p, tls=%0*lx)\n", |
338 | current->comm, current->pid, current_thread_info(), current, | |
339 | field, current_thread_info()->tp_value); | |
340 | if (cpu_has_userlocal) { | |
341 | unsigned long tls; | |
342 | ||
343 | tls = read_c0_userlocal(); | |
344 | if (tls != current_thread_info()->tp_value) | |
345 | printk("*HwTLS: %0*lx\n", field, tls); | |
346 | } | |
347 | ||
f66686f7 | 348 | show_stacktrace(current, regs); |
e1bb8289 | 349 | show_code((unsigned int __user *) regs->cp0_epc); |
1da177e4 LT |
350 | printk("\n"); |
351 | } | |
352 | ||
353 | static DEFINE_SPINLOCK(die_lock); | |
354 | ||
eae23f2c | 355 | void __noreturn die(const char * str, const struct pt_regs * regs) |
1da177e4 LT |
356 | { |
357 | static int die_counter; | |
41c594ab RB |
358 | #ifdef CONFIG_MIPS_MT_SMTC |
359 | unsigned long dvpret = dvpe(); | |
360 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
361 | |
362 | console_verbose(); | |
363 | spin_lock_irq(&die_lock); | |
41c594ab RB |
364 | bust_spinlocks(1); |
365 | #ifdef CONFIG_MIPS_MT_SMTC | |
366 | mips_mt_regdump(dvpret); | |
367 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
178086c8 | 368 | printk("%s[#%d]:\n", str, ++die_counter); |
1da177e4 | 369 | show_registers(regs); |
bcdcd8e7 | 370 | add_taint(TAINT_DIE); |
1da177e4 | 371 | spin_unlock_irq(&die_lock); |
d4fd1989 MB |
372 | |
373 | if (in_interrupt()) | |
374 | panic("Fatal exception in interrupt"); | |
375 | ||
376 | if (panic_on_oops) { | |
377 | printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n"); | |
378 | ssleep(5); | |
379 | panic("Fatal exception"); | |
380 | } | |
381 | ||
1da177e4 LT |
382 | do_exit(SIGSEGV); |
383 | } | |
384 | ||
0510617b TB |
385 | extern struct exception_table_entry __start___dbe_table[]; |
386 | extern struct exception_table_entry __stop___dbe_table[]; | |
1da177e4 | 387 | |
b6dcec9b RB |
388 | __asm__( |
389 | " .section __dbe_table, \"a\"\n" | |
390 | " .previous \n"); | |
1da177e4 LT |
391 | |
392 | /* Given an address, look for it in the exception tables. */ | |
393 | static const struct exception_table_entry *search_dbe_tables(unsigned long addr) | |
394 | { | |
395 | const struct exception_table_entry *e; | |
396 | ||
397 | e = search_extable(__start___dbe_table, __stop___dbe_table - 1, addr); | |
398 | if (!e) | |
399 | e = search_module_dbetables(addr); | |
400 | return e; | |
401 | } | |
402 | ||
403 | asmlinkage void do_be(struct pt_regs *regs) | |
404 | { | |
405 | const int field = 2 * sizeof(unsigned long); | |
406 | const struct exception_table_entry *fixup = NULL; | |
407 | int data = regs->cp0_cause & 4; | |
408 | int action = MIPS_BE_FATAL; | |
409 | ||
410 | /* XXX For now. Fixme, this searches the wrong table ... */ | |
411 | if (data && !user_mode(regs)) | |
412 | fixup = search_dbe_tables(exception_epc(regs)); | |
413 | ||
414 | if (fixup) | |
415 | action = MIPS_BE_FIXUP; | |
416 | ||
417 | if (board_be_handler) | |
28fc582c | 418 | action = board_be_handler(regs, fixup != NULL); |
1da177e4 LT |
419 | |
420 | switch (action) { | |
421 | case MIPS_BE_DISCARD: | |
422 | return; | |
423 | case MIPS_BE_FIXUP: | |
424 | if (fixup) { | |
425 | regs->cp0_epc = fixup->nextinsn; | |
426 | return; | |
427 | } | |
428 | break; | |
429 | default: | |
430 | break; | |
431 | } | |
432 | ||
433 | /* | |
434 | * Assume it would be too dangerous to continue ... | |
435 | */ | |
436 | printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", | |
437 | data ? "Data" : "Instruction", | |
438 | field, regs->cp0_epc, field, regs->regs[31]); | |
88547001 JW |
439 | if (notify_die(DIE_OOPS, "bus error", regs, SIGBUS, 0, 0) |
440 | == NOTIFY_STOP) | |
441 | return; | |
442 | ||
1da177e4 LT |
443 | die_if_kernel("Oops", regs); |
444 | force_sig(SIGBUS, current); | |
445 | } | |
446 | ||
1da177e4 | 447 | /* |
60b0d655 | 448 | * ll/sc, rdhwr, sync emulation |
1da177e4 LT |
449 | */ |
450 | ||
451 | #define OPCODE 0xfc000000 | |
452 | #define BASE 0x03e00000 | |
453 | #define RT 0x001f0000 | |
454 | #define OFFSET 0x0000ffff | |
455 | #define LL 0xc0000000 | |
456 | #define SC 0xe0000000 | |
60b0d655 | 457 | #define SPEC0 0x00000000 |
3c37026d RB |
458 | #define SPEC3 0x7c000000 |
459 | #define RD 0x0000f800 | |
460 | #define FUNC 0x0000003f | |
60b0d655 | 461 | #define SYNC 0x0000000f |
3c37026d | 462 | #define RDHWR 0x0000003b |
1da177e4 LT |
463 | |
464 | /* | |
465 | * The ll_bit is cleared by r*_switch.S | |
466 | */ | |
467 | ||
f1e39a4a RB |
468 | unsigned int ll_bit; |
469 | struct task_struct *ll_task; | |
1da177e4 | 470 | |
60b0d655 | 471 | static inline int simulate_ll(struct pt_regs *regs, unsigned int opcode) |
1da177e4 | 472 | { |
fe00f943 | 473 | unsigned long value, __user *vaddr; |
1da177e4 | 474 | long offset; |
1da177e4 LT |
475 | |
476 | /* | |
477 | * analyse the ll instruction that just caused a ri exception | |
478 | * and put the referenced address to addr. | |
479 | */ | |
480 | ||
481 | /* sign extend offset */ | |
482 | offset = opcode & OFFSET; | |
483 | offset <<= 16; | |
484 | offset >>= 16; | |
485 | ||
fe00f943 RB |
486 | vaddr = (unsigned long __user *) |
487 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); | |
1da177e4 | 488 | |
60b0d655 MR |
489 | if ((unsigned long)vaddr & 3) |
490 | return SIGBUS; | |
491 | if (get_user(value, vaddr)) | |
492 | return SIGSEGV; | |
1da177e4 LT |
493 | |
494 | preempt_disable(); | |
495 | ||
496 | if (ll_task == NULL || ll_task == current) { | |
497 | ll_bit = 1; | |
498 | } else { | |
499 | ll_bit = 0; | |
500 | } | |
501 | ll_task = current; | |
502 | ||
503 | preempt_enable(); | |
504 | ||
505 | regs->regs[(opcode & RT) >> 16] = value; | |
506 | ||
60b0d655 | 507 | return 0; |
1da177e4 LT |
508 | } |
509 | ||
60b0d655 | 510 | static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode) |
1da177e4 | 511 | { |
fe00f943 RB |
512 | unsigned long __user *vaddr; |
513 | unsigned long reg; | |
1da177e4 | 514 | long offset; |
1da177e4 LT |
515 | |
516 | /* | |
517 | * analyse the sc instruction that just caused a ri exception | |
518 | * and put the referenced address to addr. | |
519 | */ | |
520 | ||
521 | /* sign extend offset */ | |
522 | offset = opcode & OFFSET; | |
523 | offset <<= 16; | |
524 | offset >>= 16; | |
525 | ||
fe00f943 RB |
526 | vaddr = (unsigned long __user *) |
527 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); | |
1da177e4 LT |
528 | reg = (opcode & RT) >> 16; |
529 | ||
60b0d655 MR |
530 | if ((unsigned long)vaddr & 3) |
531 | return SIGBUS; | |
1da177e4 LT |
532 | |
533 | preempt_disable(); | |
534 | ||
535 | if (ll_bit == 0 || ll_task != current) { | |
536 | regs->regs[reg] = 0; | |
537 | preempt_enable(); | |
60b0d655 | 538 | return 0; |
1da177e4 LT |
539 | } |
540 | ||
541 | preempt_enable(); | |
542 | ||
60b0d655 MR |
543 | if (put_user(regs->regs[reg], vaddr)) |
544 | return SIGSEGV; | |
1da177e4 LT |
545 | |
546 | regs->regs[reg] = 1; | |
547 | ||
60b0d655 | 548 | return 0; |
1da177e4 LT |
549 | } |
550 | ||
551 | /* | |
552 | * ll uses the opcode of lwc0 and sc uses the opcode of swc0. That is both | |
553 | * opcodes are supposed to result in coprocessor unusable exceptions if | |
554 | * executed on ll/sc-less processors. That's the theory. In practice a | |
555 | * few processors such as NEC's VR4100 throw reserved instruction exceptions | |
556 | * instead, so we're doing the emulation thing in both exception handlers. | |
557 | */ | |
60b0d655 | 558 | static int simulate_llsc(struct pt_regs *regs, unsigned int opcode) |
1da177e4 | 559 | { |
60b0d655 MR |
560 | if ((opcode & OPCODE) == LL) |
561 | return simulate_ll(regs, opcode); | |
562 | if ((opcode & OPCODE) == SC) | |
563 | return simulate_sc(regs, opcode); | |
1da177e4 | 564 | |
60b0d655 | 565 | return -1; /* Must be something else ... */ |
1da177e4 LT |
566 | } |
567 | ||
3c37026d RB |
568 | /* |
569 | * Simulate trapping 'rdhwr' instructions to provide user accessible | |
1f5826bd | 570 | * registers not implemented in hardware. |
3c37026d | 571 | */ |
60b0d655 | 572 | static int simulate_rdhwr(struct pt_regs *regs, unsigned int opcode) |
3c37026d | 573 | { |
dc8f6029 | 574 | struct thread_info *ti = task_thread_info(current); |
3c37026d RB |
575 | |
576 | if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) { | |
577 | int rd = (opcode & RD) >> 11; | |
578 | int rt = (opcode & RT) >> 16; | |
579 | switch (rd) { | |
1f5826bd CD |
580 | case 0: /* CPU number */ |
581 | regs->regs[rt] = smp_processor_id(); | |
582 | return 0; | |
583 | case 1: /* SYNCI length */ | |
584 | regs->regs[rt] = min(current_cpu_data.dcache.linesz, | |
585 | current_cpu_data.icache.linesz); | |
586 | return 0; | |
587 | case 2: /* Read count register */ | |
588 | regs->regs[rt] = read_c0_count(); | |
589 | return 0; | |
590 | case 3: /* Count register resolution */ | |
591 | switch (current_cpu_data.cputype) { | |
592 | case CPU_20KC: | |
593 | case CPU_25KF: | |
594 | regs->regs[rt] = 1; | |
595 | break; | |
3c37026d | 596 | default: |
1f5826bd CD |
597 | regs->regs[rt] = 2; |
598 | } | |
599 | return 0; | |
600 | case 29: | |
601 | regs->regs[rt] = ti->tp_value; | |
602 | return 0; | |
603 | default: | |
604 | return -1; | |
3c37026d RB |
605 | } |
606 | } | |
607 | ||
56ebd51b | 608 | /* Not ours. */ |
60b0d655 MR |
609 | return -1; |
610 | } | |
e5679882 | 611 | |
60b0d655 MR |
612 | static int simulate_sync(struct pt_regs *regs, unsigned int opcode) |
613 | { | |
614 | if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) | |
615 | return 0; | |
616 | ||
617 | return -1; /* Must be something else ... */ | |
3c37026d RB |
618 | } |
619 | ||
1da177e4 LT |
620 | asmlinkage void do_ov(struct pt_regs *regs) |
621 | { | |
622 | siginfo_t info; | |
623 | ||
36ccf1c0 RB |
624 | die_if_kernel("Integer overflow", regs); |
625 | ||
1da177e4 LT |
626 | info.si_code = FPE_INTOVF; |
627 | info.si_signo = SIGFPE; | |
628 | info.si_errno = 0; | |
fe00f943 | 629 | info.si_addr = (void __user *) regs->cp0_epc; |
1da177e4 LT |
630 | force_sig_info(SIGFPE, &info, current); |
631 | } | |
632 | ||
633 | /* | |
634 | * XXX Delayed fp exceptions when doing a lazy ctx switch XXX | |
635 | */ | |
636 | asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) | |
637 | { | |
948a34cf TS |
638 | siginfo_t info; |
639 | ||
88547001 JW |
640 | if (notify_die(DIE_FP, "FP exception", regs, SIGFPE, 0, 0) |
641 | == NOTIFY_STOP) | |
642 | return; | |
57725f9e CD |
643 | die_if_kernel("FP exception in kernel code", regs); |
644 | ||
1da177e4 LT |
645 | if (fcr31 & FPU_CSR_UNI_X) { |
646 | int sig; | |
647 | ||
1da177e4 | 648 | /* |
a3dddd56 | 649 | * Unimplemented operation exception. If we've got the full |
1da177e4 LT |
650 | * software emulator on-board, let's use it... |
651 | * | |
652 | * Force FPU to dump state into task/thread context. We're | |
653 | * moving a lot of data here for what is probably a single | |
654 | * instruction, but the alternative is to pre-decode the FP | |
655 | * register operands before invoking the emulator, which seems | |
656 | * a bit extreme for what should be an infrequent event. | |
657 | */ | |
cd21dfcf | 658 | /* Ensure 'resume' not overwrite saved fp context again. */ |
53dc8028 | 659 | lose_fpu(1); |
1da177e4 LT |
660 | |
661 | /* Run the emulator */ | |
49a89efb | 662 | sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1); |
1da177e4 LT |
663 | |
664 | /* | |
665 | * We can't allow the emulated instruction to leave any of | |
666 | * the cause bit set in $fcr31. | |
667 | */ | |
eae89076 | 668 | current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X; |
1da177e4 LT |
669 | |
670 | /* Restore the hardware register state */ | |
53dc8028 | 671 | own_fpu(1); /* Using the FPU again. */ |
1da177e4 LT |
672 | |
673 | /* If something went wrong, signal */ | |
674 | if (sig) | |
675 | force_sig(sig, current); | |
676 | ||
677 | return; | |
948a34cf TS |
678 | } else if (fcr31 & FPU_CSR_INV_X) |
679 | info.si_code = FPE_FLTINV; | |
680 | else if (fcr31 & FPU_CSR_DIV_X) | |
681 | info.si_code = FPE_FLTDIV; | |
682 | else if (fcr31 & FPU_CSR_OVF_X) | |
683 | info.si_code = FPE_FLTOVF; | |
684 | else if (fcr31 & FPU_CSR_UDF_X) | |
685 | info.si_code = FPE_FLTUND; | |
686 | else if (fcr31 & FPU_CSR_INE_X) | |
687 | info.si_code = FPE_FLTRES; | |
688 | else | |
689 | info.si_code = __SI_FAULT; | |
690 | info.si_signo = SIGFPE; | |
691 | info.si_errno = 0; | |
692 | info.si_addr = (void __user *) regs->cp0_epc; | |
693 | force_sig_info(SIGFPE, &info, current); | |
1da177e4 LT |
694 | } |
695 | ||
df270051 RB |
696 | static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, |
697 | const char *str) | |
1da177e4 | 698 | { |
1da177e4 | 699 | siginfo_t info; |
df270051 | 700 | char b[40]; |
1da177e4 | 701 | |
88547001 JW |
702 | if (notify_die(DIE_TRAP, str, regs, code, 0, 0) == NOTIFY_STOP) |
703 | return; | |
704 | ||
1da177e4 | 705 | /* |
df270051 RB |
706 | * A short test says that IRIX 5.3 sends SIGTRAP for all trap |
707 | * insns, even for trap and break codes that indicate arithmetic | |
708 | * failures. Weird ... | |
1da177e4 LT |
709 | * But should we continue the brokenness??? --macro |
710 | */ | |
df270051 RB |
711 | switch (code) { |
712 | case BRK_OVERFLOW: | |
713 | case BRK_DIVZERO: | |
714 | scnprintf(b, sizeof(b), "%s instruction in kernel code", str); | |
715 | die_if_kernel(b, regs); | |
716 | if (code == BRK_DIVZERO) | |
1da177e4 LT |
717 | info.si_code = FPE_INTDIV; |
718 | else | |
719 | info.si_code = FPE_INTOVF; | |
720 | info.si_signo = SIGFPE; | |
721 | info.si_errno = 0; | |
fe00f943 | 722 | info.si_addr = (void __user *) regs->cp0_epc; |
1da177e4 LT |
723 | force_sig_info(SIGFPE, &info, current); |
724 | break; | |
63dc68a8 | 725 | case BRK_BUG: |
df270051 RB |
726 | die_if_kernel("Kernel bug detected", regs); |
727 | force_sig(SIGTRAP, current); | |
63dc68a8 | 728 | break; |
ba3049ed RB |
729 | case BRK_MEMU: |
730 | /* | |
731 | * Address errors may be deliberately induced by the FPU | |
732 | * emulator to retake control of the CPU after executing the | |
733 | * instruction in the delay slot of an emulated branch. | |
734 | * | |
735 | * Terminate if exception was recognized as a delay slot return | |
736 | * otherwise handle as normal. | |
737 | */ | |
738 | if (do_dsemulret(regs)) | |
739 | return; | |
740 | ||
741 | die_if_kernel("Math emu break/trap", regs); | |
742 | force_sig(SIGTRAP, current); | |
743 | break; | |
1da177e4 | 744 | default: |
df270051 RB |
745 | scnprintf(b, sizeof(b), "%s instruction in kernel code", str); |
746 | die_if_kernel(b, regs); | |
1da177e4 LT |
747 | force_sig(SIGTRAP, current); |
748 | } | |
df270051 RB |
749 | } |
750 | ||
751 | asmlinkage void do_bp(struct pt_regs *regs) | |
752 | { | |
753 | unsigned int opcode, bcode; | |
754 | ||
755 | if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) | |
756 | goto out_sigsegv; | |
757 | ||
758 | /* | |
759 | * There is the ancient bug in the MIPS assemblers that the break | |
760 | * code starts left to bit 16 instead to bit 6 in the opcode. | |
761 | * Gas is bug-compatible, but not always, grrr... | |
762 | * We handle both cases with a simple heuristics. --macro | |
763 | */ | |
764 | bcode = ((opcode >> 6) & ((1 << 20) - 1)); | |
765 | if (bcode >= (1 << 10)) | |
766 | bcode >>= 10; | |
767 | ||
768 | do_trap_or_bp(regs, bcode, "Break"); | |
90fccb13 | 769 | return; |
e5679882 RB |
770 | |
771 | out_sigsegv: | |
772 | force_sig(SIGSEGV, current); | |
1da177e4 LT |
773 | } |
774 | ||
775 | asmlinkage void do_tr(struct pt_regs *regs) | |
776 | { | |
777 | unsigned int opcode, tcode = 0; | |
1da177e4 | 778 | |
ba755f8e | 779 | if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
e5679882 | 780 | goto out_sigsegv; |
1da177e4 LT |
781 | |
782 | /* Immediate versions don't provide a code. */ | |
783 | if (!(opcode & OPCODE)) | |
784 | tcode = ((opcode >> 6) & ((1 << 10) - 1)); | |
785 | ||
df270051 | 786 | do_trap_or_bp(regs, tcode, "Trap"); |
90fccb13 | 787 | return; |
e5679882 RB |
788 | |
789 | out_sigsegv: | |
790 | force_sig(SIGSEGV, current); | |
1da177e4 LT |
791 | } |
792 | ||
793 | asmlinkage void do_ri(struct pt_regs *regs) | |
794 | { | |
60b0d655 MR |
795 | unsigned int __user *epc = (unsigned int __user *)exception_epc(regs); |
796 | unsigned long old_epc = regs->cp0_epc; | |
797 | unsigned int opcode = 0; | |
798 | int status = -1; | |
1da177e4 | 799 | |
88547001 JW |
800 | if (notify_die(DIE_RI, "RI Fault", regs, SIGSEGV, 0, 0) |
801 | == NOTIFY_STOP) | |
802 | return; | |
803 | ||
60b0d655 | 804 | die_if_kernel("Reserved instruction in kernel code", regs); |
1da177e4 | 805 | |
60b0d655 | 806 | if (unlikely(compute_return_epc(regs) < 0)) |
3c37026d RB |
807 | return; |
808 | ||
60b0d655 MR |
809 | if (unlikely(get_user(opcode, epc) < 0)) |
810 | status = SIGSEGV; | |
811 | ||
812 | if (!cpu_has_llsc && status < 0) | |
813 | status = simulate_llsc(regs, opcode); | |
814 | ||
815 | if (status < 0) | |
816 | status = simulate_rdhwr(regs, opcode); | |
817 | ||
818 | if (status < 0) | |
819 | status = simulate_sync(regs, opcode); | |
820 | ||
821 | if (status < 0) | |
822 | status = SIGILL; | |
823 | ||
824 | if (unlikely(status > 0)) { | |
825 | regs->cp0_epc = old_epc; /* Undo skip-over. */ | |
826 | force_sig(status, current); | |
827 | } | |
1da177e4 LT |
828 | } |
829 | ||
d223a861 RB |
830 | /* |
831 | * MIPS MT processors may have fewer FPU contexts than CPU threads. If we've | |
832 | * emulated more than some threshold number of instructions, force migration to | |
833 | * a "CPU" that has FP support. | |
834 | */ | |
835 | static void mt_ase_fp_affinity(void) | |
836 | { | |
837 | #ifdef CONFIG_MIPS_MT_FPAFF | |
838 | if (mt_fpemul_threshold > 0 && | |
839 | ((current->thread.emulated_fp++ > mt_fpemul_threshold))) { | |
840 | /* | |
841 | * If there's no FPU present, or if the application has already | |
842 | * restricted the allowed set to exclude any CPUs with FPUs, | |
843 | * we'll skip the procedure. | |
844 | */ | |
845 | if (cpus_intersects(current->cpus_allowed, mt_fpu_cpumask)) { | |
846 | cpumask_t tmask; | |
847 | ||
9cc12363 KK |
848 | current->thread.user_cpus_allowed |
849 | = current->cpus_allowed; | |
850 | cpus_and(tmask, current->cpus_allowed, | |
851 | mt_fpu_cpumask); | |
d223a861 | 852 | set_cpus_allowed(current, tmask); |
293c5bd1 | 853 | set_thread_flag(TIF_FPUBOUND); |
d223a861 RB |
854 | } |
855 | } | |
856 | #endif /* CONFIG_MIPS_MT_FPAFF */ | |
857 | } | |
858 | ||
69f3a7de RB |
859 | /* |
860 | * No lock; only written during early bootup by CPU 0. | |
861 | */ | |
862 | static RAW_NOTIFIER_HEAD(cu2_chain); | |
863 | ||
864 | int __ref register_cu2_notifier(struct notifier_block *nb) | |
865 | { | |
866 | return raw_notifier_chain_register(&cu2_chain, nb); | |
867 | } | |
868 | ||
869 | int cu2_notifier_call_chain(unsigned long val, void *v) | |
870 | { | |
871 | return raw_notifier_call_chain(&cu2_chain, val, v); | |
872 | } | |
873 | ||
874 | static int default_cu2_call(struct notifier_block *nfb, unsigned long action, | |
875 | void *data) | |
876 | { | |
877 | struct pt_regs *regs = data; | |
878 | ||
879 | switch (action) { | |
880 | default: | |
881 | die_if_kernel("Unhandled kernel unaligned access or invalid " | |
882 | "instruction", regs); | |
883 | /* Fall through */ | |
884 | ||
885 | case CU2_EXCEPTION: | |
886 | force_sig(SIGILL, current); | |
887 | } | |
888 | ||
889 | return NOTIFY_OK; | |
890 | } | |
891 | ||
892 | static struct notifier_block default_cu2_notifier = { | |
893 | .notifier_call = default_cu2_call, | |
894 | .priority = 0x80000000, /* Run last */ | |
895 | }; | |
896 | ||
1da177e4 LT |
897 | asmlinkage void do_cpu(struct pt_regs *regs) |
898 | { | |
60b0d655 MR |
899 | unsigned int __user *epc; |
900 | unsigned long old_epc; | |
901 | unsigned int opcode; | |
1da177e4 | 902 | unsigned int cpid; |
60b0d655 | 903 | int status; |
f9bb4cf3 | 904 | unsigned long __maybe_unused flags; |
1da177e4 | 905 | |
5323180d AN |
906 | die_if_kernel("do_cpu invoked from kernel context!", regs); |
907 | ||
1da177e4 LT |
908 | cpid = (regs->cp0_cause >> CAUSEB_CE) & 3; |
909 | ||
910 | switch (cpid) { | |
911 | case 0: | |
60b0d655 MR |
912 | epc = (unsigned int __user *)exception_epc(regs); |
913 | old_epc = regs->cp0_epc; | |
914 | opcode = 0; | |
915 | status = -1; | |
1da177e4 | 916 | |
60b0d655 | 917 | if (unlikely(compute_return_epc(regs) < 0)) |
1da177e4 | 918 | return; |
3c37026d | 919 | |
60b0d655 MR |
920 | if (unlikely(get_user(opcode, epc) < 0)) |
921 | status = SIGSEGV; | |
922 | ||
923 | if (!cpu_has_llsc && status < 0) | |
924 | status = simulate_llsc(regs, opcode); | |
925 | ||
926 | if (status < 0) | |
927 | status = simulate_rdhwr(regs, opcode); | |
928 | ||
929 | if (status < 0) | |
930 | status = SIGILL; | |
931 | ||
932 | if (unlikely(status > 0)) { | |
933 | regs->cp0_epc = old_epc; /* Undo skip-over. */ | |
934 | force_sig(status, current); | |
935 | } | |
936 | ||
937 | return; | |
1da177e4 LT |
938 | |
939 | case 1: | |
53dc8028 AN |
940 | if (used_math()) /* Using the FPU again. */ |
941 | own_fpu(1); | |
942 | else { /* First time FPU user. */ | |
1da177e4 LT |
943 | init_fpu(); |
944 | set_used_math(); | |
945 | } | |
946 | ||
5323180d | 947 | if (!raw_cpu_has_fpu) { |
e04582b7 | 948 | int sig; |
e04582b7 AN |
949 | sig = fpu_emulator_cop1Handler(regs, |
950 | ¤t->thread.fpu, 0); | |
1da177e4 LT |
951 | if (sig) |
952 | force_sig(sig, current); | |
d223a861 RB |
953 | else |
954 | mt_ase_fp_affinity(); | |
1da177e4 LT |
955 | } |
956 | ||
1da177e4 LT |
957 | return; |
958 | ||
959 | case 2: | |
69f3a7de RB |
960 | raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs); |
961 | break; | |
962 | ||
1da177e4 LT |
963 | case 3: |
964 | break; | |
965 | } | |
966 | ||
967 | force_sig(SIGILL, current); | |
968 | } | |
969 | ||
970 | asmlinkage void do_mdmx(struct pt_regs *regs) | |
971 | { | |
972 | force_sig(SIGILL, current); | |
973 | } | |
974 | ||
8bc6d05b DD |
975 | /* |
976 | * Called with interrupts disabled. | |
977 | */ | |
1da177e4 LT |
978 | asmlinkage void do_watch(struct pt_regs *regs) |
979 | { | |
b67b2b70 DD |
980 | u32 cause; |
981 | ||
1da177e4 | 982 | /* |
b67b2b70 DD |
983 | * Clear WP (bit 22) bit of cause register so we don't loop |
984 | * forever. | |
1da177e4 | 985 | */ |
b67b2b70 DD |
986 | cause = read_c0_cause(); |
987 | cause &= ~(1 << 22); | |
988 | write_c0_cause(cause); | |
989 | ||
990 | /* | |
991 | * If the current thread has the watch registers loaded, save | |
992 | * their values and send SIGTRAP. Otherwise another thread | |
993 | * left the registers set, clear them and continue. | |
994 | */ | |
995 | if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) { | |
996 | mips_read_watch_registers(); | |
8bc6d05b | 997 | local_irq_enable(); |
b67b2b70 | 998 | force_sig(SIGTRAP, current); |
8bc6d05b | 999 | } else { |
b67b2b70 | 1000 | mips_clear_watch_registers(); |
8bc6d05b DD |
1001 | local_irq_enable(); |
1002 | } | |
1da177e4 LT |
1003 | } |
1004 | ||
1005 | asmlinkage void do_mcheck(struct pt_regs *regs) | |
1006 | { | |
cac4bcbc RB |
1007 | const int field = 2 * sizeof(unsigned long); |
1008 | int multi_match = regs->cp0_status & ST0_TS; | |
1009 | ||
1da177e4 | 1010 | show_regs(regs); |
cac4bcbc RB |
1011 | |
1012 | if (multi_match) { | |
1013 | printk("Index : %0x\n", read_c0_index()); | |
1014 | printk("Pagemask: %0x\n", read_c0_pagemask()); | |
1015 | printk("EntryHi : %0*lx\n", field, read_c0_entryhi()); | |
1016 | printk("EntryLo0: %0*lx\n", field, read_c0_entrylo0()); | |
1017 | printk("EntryLo1: %0*lx\n", field, read_c0_entrylo1()); | |
1018 | printk("\n"); | |
1019 | dump_tlb_all(); | |
1020 | } | |
1021 | ||
e1bb8289 | 1022 | show_code((unsigned int __user *) regs->cp0_epc); |
cac4bcbc | 1023 | |
1da177e4 LT |
1024 | /* |
1025 | * Some chips may have other causes of machine check (e.g. SB1 | |
1026 | * graduation timer) | |
1027 | */ | |
1028 | panic("Caught Machine Check exception - %scaused by multiple " | |
1029 | "matching entries in the TLB.", | |
cac4bcbc | 1030 | (multi_match) ? "" : "not "); |
1da177e4 LT |
1031 | } |
1032 | ||
340ee4b9 RB |
1033 | asmlinkage void do_mt(struct pt_regs *regs) |
1034 | { | |
41c594ab RB |
1035 | int subcode; |
1036 | ||
41c594ab RB |
1037 | subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT) |
1038 | >> VPECONTROL_EXCPT_SHIFT; | |
1039 | switch (subcode) { | |
1040 | case 0: | |
e35a5e35 | 1041 | printk(KERN_DEBUG "Thread Underflow\n"); |
41c594ab RB |
1042 | break; |
1043 | case 1: | |
e35a5e35 | 1044 | printk(KERN_DEBUG "Thread Overflow\n"); |
41c594ab RB |
1045 | break; |
1046 | case 2: | |
e35a5e35 | 1047 | printk(KERN_DEBUG "Invalid YIELD Qualifier\n"); |
41c594ab RB |
1048 | break; |
1049 | case 3: | |
e35a5e35 | 1050 | printk(KERN_DEBUG "Gating Storage Exception\n"); |
41c594ab RB |
1051 | break; |
1052 | case 4: | |
e35a5e35 | 1053 | printk(KERN_DEBUG "YIELD Scheduler Exception\n"); |
41c594ab RB |
1054 | break; |
1055 | case 5: | |
e35a5e35 | 1056 | printk(KERN_DEBUG "Gating Storage Schedulier Exception\n"); |
41c594ab RB |
1057 | break; |
1058 | default: | |
e35a5e35 | 1059 | printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n", |
41c594ab RB |
1060 | subcode); |
1061 | break; | |
1062 | } | |
340ee4b9 RB |
1063 | die_if_kernel("MIPS MT Thread exception in kernel", regs); |
1064 | ||
1065 | force_sig(SIGILL, current); | |
1066 | } | |
1067 | ||
1068 | ||
e50c0a8f RB |
1069 | asmlinkage void do_dsp(struct pt_regs *regs) |
1070 | { | |
1071 | if (cpu_has_dsp) | |
1072 | panic("Unexpected DSP exception\n"); | |
1073 | ||
1074 | force_sig(SIGILL, current); | |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | asmlinkage void do_reserved(struct pt_regs *regs) |
1078 | { | |
1079 | /* | |
1080 | * Game over - no way to handle this if it ever occurs. Most probably | |
1081 | * caused by a new unknown cpu type or after another deadly | |
1082 | * hard/software error. | |
1083 | */ | |
1084 | show_regs(regs); | |
1085 | panic("Caught reserved exception %ld - should not happen.", | |
1086 | (regs->cp0_cause & 0x7f) >> 2); | |
1087 | } | |
1088 | ||
39b8d525 RB |
1089 | static int __initdata l1parity = 1; |
1090 | static int __init nol1parity(char *s) | |
1091 | { | |
1092 | l1parity = 0; | |
1093 | return 1; | |
1094 | } | |
1095 | __setup("nol1par", nol1parity); | |
1096 | static int __initdata l2parity = 1; | |
1097 | static int __init nol2parity(char *s) | |
1098 | { | |
1099 | l2parity = 0; | |
1100 | return 1; | |
1101 | } | |
1102 | __setup("nol2par", nol2parity); | |
1103 | ||
1da177e4 LT |
1104 | /* |
1105 | * Some MIPS CPUs can enable/disable for cache parity detection, but do | |
1106 | * it different ways. | |
1107 | */ | |
1108 | static inline void parity_protection_init(void) | |
1109 | { | |
10cc3529 | 1110 | switch (current_cpu_type()) { |
1da177e4 | 1111 | case CPU_24K: |
98a41de9 | 1112 | case CPU_34K: |
39b8d525 RB |
1113 | case CPU_74K: |
1114 | case CPU_1004K: | |
1115 | { | |
1116 | #define ERRCTL_PE 0x80000000 | |
1117 | #define ERRCTL_L2P 0x00800000 | |
1118 | unsigned long errctl; | |
1119 | unsigned int l1parity_present, l2parity_present; | |
1120 | ||
1121 | errctl = read_c0_ecc(); | |
1122 | errctl &= ~(ERRCTL_PE|ERRCTL_L2P); | |
1123 | ||
1124 | /* probe L1 parity support */ | |
1125 | write_c0_ecc(errctl | ERRCTL_PE); | |
1126 | back_to_back_c0_hazard(); | |
1127 | l1parity_present = (read_c0_ecc() & ERRCTL_PE); | |
1128 | ||
1129 | /* probe L2 parity support */ | |
1130 | write_c0_ecc(errctl|ERRCTL_L2P); | |
1131 | back_to_back_c0_hazard(); | |
1132 | l2parity_present = (read_c0_ecc() & ERRCTL_L2P); | |
1133 | ||
1134 | if (l1parity_present && l2parity_present) { | |
1135 | if (l1parity) | |
1136 | errctl |= ERRCTL_PE; | |
1137 | if (l1parity ^ l2parity) | |
1138 | errctl |= ERRCTL_L2P; | |
1139 | } else if (l1parity_present) { | |
1140 | if (l1parity) | |
1141 | errctl |= ERRCTL_PE; | |
1142 | } else if (l2parity_present) { | |
1143 | if (l2parity) | |
1144 | errctl |= ERRCTL_L2P; | |
1145 | } else { | |
1146 | /* No parity available */ | |
1147 | } | |
1148 | ||
1149 | printk(KERN_INFO "Writing ErrCtl register=%08lx\n", errctl); | |
1150 | ||
1151 | write_c0_ecc(errctl); | |
1152 | back_to_back_c0_hazard(); | |
1153 | errctl = read_c0_ecc(); | |
1154 | printk(KERN_INFO "Readback ErrCtl register=%08lx\n", errctl); | |
1155 | ||
1156 | if (l1parity_present) | |
1157 | printk(KERN_INFO "Cache parity protection %sabled\n", | |
1158 | (errctl & ERRCTL_PE) ? "en" : "dis"); | |
1159 | ||
1160 | if (l2parity_present) { | |
1161 | if (l1parity_present && l1parity) | |
1162 | errctl ^= ERRCTL_L2P; | |
1163 | printk(KERN_INFO "L2 cache parity protection %sabled\n", | |
1164 | (errctl & ERRCTL_L2P) ? "en" : "dis"); | |
1165 | } | |
1166 | } | |
1167 | break; | |
1168 | ||
1da177e4 | 1169 | case CPU_5KC: |
14f18b7f RB |
1170 | write_c0_ecc(0x80000000); |
1171 | back_to_back_c0_hazard(); | |
1172 | /* Set the PE bit (bit 31) in the c0_errctl register. */ | |
1173 | printk(KERN_INFO "Cache parity protection %sabled\n", | |
1174 | (read_c0_ecc() & 0x80000000) ? "en" : "dis"); | |
1da177e4 LT |
1175 | break; |
1176 | case CPU_20KC: | |
1177 | case CPU_25KF: | |
1178 | /* Clear the DE bit (bit 16) in the c0_status register. */ | |
1179 | printk(KERN_INFO "Enable cache parity protection for " | |
1180 | "MIPS 20KC/25KF CPUs.\n"); | |
1181 | clear_c0_status(ST0_DE); | |
1182 | break; | |
1183 | default: | |
1184 | break; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | asmlinkage void cache_parity_error(void) | |
1189 | { | |
1190 | const int field = 2 * sizeof(unsigned long); | |
1191 | unsigned int reg_val; | |
1192 | ||
1193 | /* For the moment, report the problem and hang. */ | |
1194 | printk("Cache error exception:\n"); | |
1195 | printk("cp0_errorepc == %0*lx\n", field, read_c0_errorepc()); | |
1196 | reg_val = read_c0_cacheerr(); | |
1197 | printk("c0_cacheerr == %08x\n", reg_val); | |
1198 | ||
1199 | printk("Decoded c0_cacheerr: %s cache fault in %s reference.\n", | |
1200 | reg_val & (1<<30) ? "secondary" : "primary", | |
1201 | reg_val & (1<<31) ? "data" : "insn"); | |
1202 | printk("Error bits: %s%s%s%s%s%s%s\n", | |
1203 | reg_val & (1<<29) ? "ED " : "", | |
1204 | reg_val & (1<<28) ? "ET " : "", | |
1205 | reg_val & (1<<26) ? "EE " : "", | |
1206 | reg_val & (1<<25) ? "EB " : "", | |
1207 | reg_val & (1<<24) ? "EI " : "", | |
1208 | reg_val & (1<<23) ? "E1 " : "", | |
1209 | reg_val & (1<<22) ? "E0 " : ""); | |
1210 | printk("IDX: 0x%08x\n", reg_val & ((1<<22)-1)); | |
1211 | ||
ec917c2c | 1212 | #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) |
1da177e4 LT |
1213 | if (reg_val & (1<<22)) |
1214 | printk("DErrAddr0: 0x%0*lx\n", field, read_c0_derraddr0()); | |
1215 | ||
1216 | if (reg_val & (1<<23)) | |
1217 | printk("DErrAddr1: 0x%0*lx\n", field, read_c0_derraddr1()); | |
1218 | #endif | |
1219 | ||
1220 | panic("Can't handle the cache error!"); | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * SDBBP EJTAG debug exception handler. | |
1225 | * We skip the instruction and return to the next instruction. | |
1226 | */ | |
1227 | void ejtag_exception_handler(struct pt_regs *regs) | |
1228 | { | |
1229 | const int field = 2 * sizeof(unsigned long); | |
1230 | unsigned long depc, old_epc; | |
1231 | unsigned int debug; | |
1232 | ||
70ae6126 | 1233 | printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n"); |
1da177e4 LT |
1234 | depc = read_c0_depc(); |
1235 | debug = read_c0_debug(); | |
70ae6126 | 1236 | printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug); |
1da177e4 LT |
1237 | if (debug & 0x80000000) { |
1238 | /* | |
1239 | * In branch delay slot. | |
1240 | * We cheat a little bit here and use EPC to calculate the | |
1241 | * debug return address (DEPC). EPC is restored after the | |
1242 | * calculation. | |
1243 | */ | |
1244 | old_epc = regs->cp0_epc; | |
1245 | regs->cp0_epc = depc; | |
1246 | __compute_return_epc(regs); | |
1247 | depc = regs->cp0_epc; | |
1248 | regs->cp0_epc = old_epc; | |
1249 | } else | |
1250 | depc += 4; | |
1251 | write_c0_depc(depc); | |
1252 | ||
1253 | #if 0 | |
70ae6126 | 1254 | printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n"); |
1da177e4 LT |
1255 | write_c0_debug(debug | 0x100); |
1256 | #endif | |
1257 | } | |
1258 | ||
1259 | /* | |
1260 | * NMI exception handler. | |
1261 | */ | |
34412c72 | 1262 | NORET_TYPE void ATTRIB_NORET nmi_exception_handler(struct pt_regs *regs) |
1da177e4 | 1263 | { |
41c594ab | 1264 | bust_spinlocks(1); |
1da177e4 LT |
1265 | printk("NMI taken!!!!\n"); |
1266 | die("NMI", regs); | |
1da177e4 LT |
1267 | } |
1268 | ||
e01402b1 RB |
1269 | #define VECTORSPACING 0x100 /* for EI/VI mode */ |
1270 | ||
1271 | unsigned long ebase; | |
1da177e4 | 1272 | unsigned long exception_handlers[32]; |
e01402b1 | 1273 | unsigned long vi_handlers[64]; |
1da177e4 | 1274 | |
2d1b6e95 | 1275 | void __init *set_except_vector(int n, void *addr) |
1da177e4 LT |
1276 | { |
1277 | unsigned long handler = (unsigned long) addr; | |
1278 | unsigned long old_handler = exception_handlers[n]; | |
1279 | ||
1280 | exception_handlers[n] = handler; | |
1281 | if (n == 0 && cpu_has_divec) { | |
92bbe1b9 FF |
1282 | unsigned long jump_mask = ~((1 << 28) - 1); |
1283 | u32 *buf = (u32 *)(ebase + 0x200); | |
1284 | unsigned int k0 = 26; | |
1285 | if ((handler & jump_mask) == ((ebase + 0x200) & jump_mask)) { | |
1286 | uasm_i_j(&buf, handler & ~jump_mask); | |
1287 | uasm_i_nop(&buf); | |
1288 | } else { | |
1289 | UASM_i_LA(&buf, k0, handler); | |
1290 | uasm_i_jr(&buf, k0); | |
1291 | uasm_i_nop(&buf); | |
1292 | } | |
1293 | local_flush_icache_range(ebase + 0x200, (unsigned long)buf); | |
e01402b1 RB |
1294 | } |
1295 | return (void *)old_handler; | |
1296 | } | |
1297 | ||
6ba07e59 AN |
1298 | static asmlinkage void do_default_vi(void) |
1299 | { | |
1300 | show_regs(get_irq_regs()); | |
1301 | panic("Caught unexpected vectored interrupt."); | |
1302 | } | |
1303 | ||
ef300e42 | 1304 | static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs) |
e01402b1 RB |
1305 | { |
1306 | unsigned long handler; | |
1307 | unsigned long old_handler = vi_handlers[n]; | |
f6771dbb | 1308 | int srssets = current_cpu_data.srsets; |
e01402b1 RB |
1309 | u32 *w; |
1310 | unsigned char *b; | |
1311 | ||
b72b7092 | 1312 | BUG_ON(!cpu_has_veic && !cpu_has_vint); |
e01402b1 RB |
1313 | |
1314 | if (addr == NULL) { | |
1315 | handler = (unsigned long) do_default_vi; | |
1316 | srs = 0; | |
41c594ab | 1317 | } else |
e01402b1 RB |
1318 | handler = (unsigned long) addr; |
1319 | vi_handlers[n] = (unsigned long) addr; | |
1320 | ||
1321 | b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING); | |
1322 | ||
f6771dbb | 1323 | if (srs >= srssets) |
e01402b1 RB |
1324 | panic("Shadow register set %d not supported", srs); |
1325 | ||
1326 | if (cpu_has_veic) { | |
1327 | if (board_bind_eic_interrupt) | |
49a89efb | 1328 | board_bind_eic_interrupt(n, srs); |
41c594ab | 1329 | } else if (cpu_has_vint) { |
e01402b1 | 1330 | /* SRSMap is only defined if shadow sets are implemented */ |
f6771dbb | 1331 | if (srssets > 1) |
49a89efb | 1332 | change_c0_srsmap(0xf << n*4, srs << n*4); |
e01402b1 RB |
1333 | } |
1334 | ||
1335 | if (srs == 0) { | |
1336 | /* | |
1337 | * If no shadow set is selected then use the default handler | |
1338 | * that does normal register saving and a standard interrupt exit | |
1339 | */ | |
1340 | ||
1341 | extern char except_vec_vi, except_vec_vi_lui; | |
1342 | extern char except_vec_vi_ori, except_vec_vi_end; | |
c65a5480 AN |
1343 | extern char rollback_except_vec_vi; |
1344 | char *vec_start = (cpu_wait == r4k_wait) ? | |
1345 | &rollback_except_vec_vi : &except_vec_vi; | |
41c594ab RB |
1346 | #ifdef CONFIG_MIPS_MT_SMTC |
1347 | /* | |
1348 | * We need to provide the SMTC vectored interrupt handler | |
1349 | * not only with the address of the handler, but with the | |
1350 | * Status.IM bit to be masked before going there. | |
1351 | */ | |
1352 | extern char except_vec_vi_mori; | |
c65a5480 | 1353 | const int mori_offset = &except_vec_vi_mori - vec_start; |
41c594ab | 1354 | #endif /* CONFIG_MIPS_MT_SMTC */ |
c65a5480 AN |
1355 | const int handler_len = &except_vec_vi_end - vec_start; |
1356 | const int lui_offset = &except_vec_vi_lui - vec_start; | |
1357 | const int ori_offset = &except_vec_vi_ori - vec_start; | |
e01402b1 RB |
1358 | |
1359 | if (handler_len > VECTORSPACING) { | |
1360 | /* | |
1361 | * Sigh... panicing won't help as the console | |
1362 | * is probably not configured :( | |
1363 | */ | |
49a89efb | 1364 | panic("VECTORSPACING too small"); |
e01402b1 RB |
1365 | } |
1366 | ||
c65a5480 | 1367 | memcpy(b, vec_start, handler_len); |
41c594ab | 1368 | #ifdef CONFIG_MIPS_MT_SMTC |
8e8a52ed RB |
1369 | BUG_ON(n > 7); /* Vector index %d exceeds SMTC maximum. */ |
1370 | ||
41c594ab RB |
1371 | w = (u32 *)(b + mori_offset); |
1372 | *w = (*w & 0xffff0000) | (0x100 << n); | |
1373 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
e01402b1 RB |
1374 | w = (u32 *)(b + lui_offset); |
1375 | *w = (*w & 0xffff0000) | (((u32)handler >> 16) & 0xffff); | |
1376 | w = (u32 *)(b + ori_offset); | |
1377 | *w = (*w & 0xffff0000) | ((u32)handler & 0xffff); | |
e0cee3ee TB |
1378 | local_flush_icache_range((unsigned long)b, |
1379 | (unsigned long)(b+handler_len)); | |
e01402b1 RB |
1380 | } |
1381 | else { | |
1382 | /* | |
1383 | * In other cases jump directly to the interrupt handler | |
1384 | * | |
1385 | * It is the handlers responsibility to save registers if required | |
1386 | * (eg hi/lo) and return from the exception using "eret" | |
1387 | */ | |
1388 | w = (u32 *)b; | |
1389 | *w++ = 0x08000000 | (((u32)handler >> 2) & 0x03fffff); /* j handler */ | |
1390 | *w = 0; | |
e0cee3ee TB |
1391 | local_flush_icache_range((unsigned long)b, |
1392 | (unsigned long)(b+8)); | |
1da177e4 | 1393 | } |
e01402b1 | 1394 | |
1da177e4 LT |
1395 | return (void *)old_handler; |
1396 | } | |
1397 | ||
ef300e42 | 1398 | void *set_vi_handler(int n, vi_handler_t addr) |
e01402b1 | 1399 | { |
ff3eab2a | 1400 | return set_vi_srs_handler(n, addr, 0); |
e01402b1 | 1401 | } |
f41ae0b2 | 1402 | |
1da177e4 LT |
1403 | extern void cpu_cache_init(void); |
1404 | extern void tlb_init(void); | |
1d40cfcd | 1405 | extern void flush_tlb_handlers(void); |
1da177e4 | 1406 | |
42f77542 RB |
1407 | /* |
1408 | * Timer interrupt | |
1409 | */ | |
1410 | int cp0_compare_irq; | |
010c108d | 1411 | int cp0_compare_irq_shift; |
42f77542 RB |
1412 | |
1413 | /* | |
1414 | * Performance counter IRQ or -1 if shared with timer | |
1415 | */ | |
1416 | int cp0_perfcount_irq; | |
1417 | EXPORT_SYMBOL_GPL(cp0_perfcount_irq); | |
1418 | ||
bdc94eb4 CD |
1419 | static int __cpuinitdata noulri; |
1420 | ||
1421 | static int __init ulri_disable(char *s) | |
1422 | { | |
1423 | pr_info("Disabling ulri\n"); | |
1424 | noulri = 1; | |
1425 | ||
1426 | return 1; | |
1427 | } | |
1428 | __setup("noulri", ulri_disable); | |
1429 | ||
234fcd14 | 1430 | void __cpuinit per_cpu_trap_init(void) |
1da177e4 LT |
1431 | { |
1432 | unsigned int cpu = smp_processor_id(); | |
1433 | unsigned int status_set = ST0_CU0; | |
41c594ab RB |
1434 | #ifdef CONFIG_MIPS_MT_SMTC |
1435 | int secondaryTC = 0; | |
1436 | int bootTC = (cpu == 0); | |
1437 | ||
1438 | /* | |
1439 | * Only do per_cpu_trap_init() for first TC of Each VPE. | |
1440 | * Note that this hack assumes that the SMTC init code | |
1441 | * assigns TCs consecutively and in ascending order. | |
1442 | */ | |
1443 | ||
1444 | if (((read_c0_tcbind() & TCBIND_CURTC) != 0) && | |
1445 | ((read_c0_tcbind() & TCBIND_CURVPE) == cpu_data[cpu - 1].vpe_id)) | |
1446 | secondaryTC = 1; | |
1447 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1448 | |
1449 | /* | |
1450 | * Disable coprocessors and select 32-bit or 64-bit addressing | |
1451 | * and the 16/32 or 32/32 FPR register model. Reset the BEV | |
1452 | * flag that some firmware may have left set and the TS bit (for | |
1453 | * IP27). Set XX for ISA IV code to work. | |
1454 | */ | |
875d43e7 | 1455 | #ifdef CONFIG_64BIT |
1da177e4 LT |
1456 | status_set |= ST0_FR|ST0_KX|ST0_SX|ST0_UX; |
1457 | #endif | |
1458 | if (current_cpu_data.isa_level == MIPS_CPU_ISA_IV) | |
1459 | status_set |= ST0_XX; | |
bbaf238b CD |
1460 | if (cpu_has_dsp) |
1461 | status_set |= ST0_MX; | |
1462 | ||
b38c7399 | 1463 | change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX, |
1da177e4 LT |
1464 | status_set); |
1465 | ||
a3692020 | 1466 | if (cpu_has_mips_r2) { |
fbeda19f | 1467 | unsigned int enable = 0x0000000f | cpu_hwrena_impl_bits; |
a3692020 | 1468 | |
bdc94eb4 | 1469 | if (!noulri && cpu_has_userlocal) |
a3692020 RB |
1470 | enable |= (1 << 29); |
1471 | ||
1472 | write_c0_hwrena(enable); | |
1473 | } | |
e01402b1 | 1474 | |
41c594ab RB |
1475 | #ifdef CONFIG_MIPS_MT_SMTC |
1476 | if (!secondaryTC) { | |
1477 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1478 | ||
e01402b1 | 1479 | if (cpu_has_veic || cpu_has_vint) { |
9fb4c2b9 | 1480 | unsigned long sr = set_c0_status(ST0_BEV); |
49a89efb | 1481 | write_c0_ebase(ebase); |
9fb4c2b9 | 1482 | write_c0_status(sr); |
e01402b1 | 1483 | /* Setting vector spacing enables EI/VI mode */ |
49a89efb | 1484 | change_c0_intctl(0x3e0, VECTORSPACING); |
e01402b1 | 1485 | } |
d03d0a57 RB |
1486 | if (cpu_has_divec) { |
1487 | if (cpu_has_mipsmt) { | |
1488 | unsigned int vpflags = dvpe(); | |
1489 | set_c0_cause(CAUSEF_IV); | |
1490 | evpe(vpflags); | |
1491 | } else | |
1492 | set_c0_cause(CAUSEF_IV); | |
1493 | } | |
3b1d4ed5 RB |
1494 | |
1495 | /* | |
1496 | * Before R2 both interrupt numbers were fixed to 7, so on R2 only: | |
1497 | * | |
1498 | * o read IntCtl.IPTI to determine the timer interrupt | |
1499 | * o read IntCtl.IPPCI to determine the performance counter interrupt | |
1500 | */ | |
1501 | if (cpu_has_mips_r2) { | |
010c108d DV |
1502 | cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP; |
1503 | cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7; | |
1504 | cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7; | |
c3e838a2 | 1505 | if (cp0_perfcount_irq == cp0_compare_irq) |
3b1d4ed5 | 1506 | cp0_perfcount_irq = -1; |
c3e838a2 CD |
1507 | } else { |
1508 | cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ; | |
f4fc580b | 1509 | cp0_compare_irq_shift = cp0_compare_irq; |
c3e838a2 | 1510 | cp0_perfcount_irq = -1; |
3b1d4ed5 RB |
1511 | } |
1512 | ||
41c594ab RB |
1513 | #ifdef CONFIG_MIPS_MT_SMTC |
1514 | } | |
1515 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1516 | |
1517 | cpu_data[cpu].asid_cache = ASID_FIRST_VERSION; | |
1518 | TLBMISS_HANDLER_SETUP(); | |
1519 | ||
1520 | atomic_inc(&init_mm.mm_count); | |
1521 | current->active_mm = &init_mm; | |
1522 | BUG_ON(current->mm); | |
1523 | enter_lazy_tlb(&init_mm, current); | |
1524 | ||
41c594ab RB |
1525 | #ifdef CONFIG_MIPS_MT_SMTC |
1526 | if (bootTC) { | |
1527 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1528 | cpu_cache_init(); | |
1529 | tlb_init(); | |
1530 | #ifdef CONFIG_MIPS_MT_SMTC | |
6a05888d RB |
1531 | } else if (!secondaryTC) { |
1532 | /* | |
1533 | * First TC in non-boot VPE must do subset of tlb_init() | |
1534 | * for MMU countrol registers. | |
1535 | */ | |
1536 | write_c0_pagemask(PM_DEFAULT_MASK); | |
1537 | write_c0_wired(0); | |
41c594ab RB |
1538 | } |
1539 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 LT |
1540 | } |
1541 | ||
e01402b1 | 1542 | /* Install CPU exception handler */ |
49a89efb | 1543 | void __init set_handler(unsigned long offset, void *addr, unsigned long size) |
e01402b1 RB |
1544 | { |
1545 | memcpy((void *)(ebase + offset), addr, size); | |
e0cee3ee | 1546 | local_flush_icache_range(ebase + offset, ebase + offset + size); |
e01402b1 RB |
1547 | } |
1548 | ||
234fcd14 | 1549 | static char panic_null_cerr[] __cpuinitdata = |
641e97f3 RB |
1550 | "Trying to set NULL cache error exception handler"; |
1551 | ||
42fe7ee3 RB |
1552 | /* |
1553 | * Install uncached CPU exception handler. | |
1554 | * This is suitable only for the cache error exception which is the only | |
1555 | * exception handler that is being run uncached. | |
1556 | */ | |
234fcd14 RB |
1557 | void __cpuinit set_uncached_handler(unsigned long offset, void *addr, |
1558 | unsigned long size) | |
e01402b1 RB |
1559 | { |
1560 | #ifdef CONFIG_32BIT | |
1561 | unsigned long uncached_ebase = KSEG1ADDR(ebase); | |
1562 | #endif | |
1563 | #ifdef CONFIG_64BIT | |
1564 | unsigned long uncached_ebase = TO_UNCAC(ebase); | |
1565 | #endif | |
1566 | ||
641e97f3 RB |
1567 | if (!addr) |
1568 | panic(panic_null_cerr); | |
1569 | ||
e01402b1 RB |
1570 | memcpy((void *)(uncached_ebase + offset), addr, size); |
1571 | } | |
1572 | ||
5b10496b AN |
1573 | static int __initdata rdhwr_noopt; |
1574 | static int __init set_rdhwr_noopt(char *str) | |
1575 | { | |
1576 | rdhwr_noopt = 1; | |
1577 | return 1; | |
1578 | } | |
1579 | ||
1580 | __setup("rdhwr_noopt", set_rdhwr_noopt); | |
1581 | ||
1da177e4 LT |
1582 | void __init trap_init(void) |
1583 | { | |
1584 | extern char except_vec3_generic, except_vec3_r4000; | |
1da177e4 LT |
1585 | extern char except_vec4; |
1586 | unsigned long i; | |
c65a5480 AN |
1587 | int rollback; |
1588 | ||
1589 | check_wait(); | |
1590 | rollback = (cpu_wait == r4k_wait); | |
1da177e4 | 1591 | |
88547001 JW |
1592 | #if defined(CONFIG_KGDB) |
1593 | if (kgdb_early_setup) | |
1594 | return; /* Already done */ | |
1595 | #endif | |
1596 | ||
9fb4c2b9 CD |
1597 | if (cpu_has_veic || cpu_has_vint) { |
1598 | unsigned long size = 0x200 + VECTORSPACING*64; | |
1599 | ebase = (unsigned long) | |
1600 | __alloc_bootmem(size, 1 << fls(size), 0); | |
1601 | } else { | |
f6be75d0 | 1602 | ebase = CKSEG0; |
566f74f6 DD |
1603 | if (cpu_has_mips_r2) |
1604 | ebase += (read_c0_ebase() & 0x3ffff000); | |
1605 | } | |
e01402b1 | 1606 | |
1da177e4 LT |
1607 | per_cpu_trap_init(); |
1608 | ||
1609 | /* | |
1610 | * Copy the generic exception handlers to their final destination. | |
1611 | * This will be overriden later as suitable for a particular | |
1612 | * configuration. | |
1613 | */ | |
e01402b1 | 1614 | set_handler(0x180, &except_vec3_generic, 0x80); |
1da177e4 LT |
1615 | |
1616 | /* | |
1617 | * Setup default vectors | |
1618 | */ | |
1619 | for (i = 0; i <= 31; i++) | |
1620 | set_except_vector(i, handle_reserved); | |
1621 | ||
1622 | /* | |
1623 | * Copy the EJTAG debug exception vector handler code to it's final | |
1624 | * destination. | |
1625 | */ | |
e01402b1 | 1626 | if (cpu_has_ejtag && board_ejtag_handler_setup) |
49a89efb | 1627 | board_ejtag_handler_setup(); |
1da177e4 LT |
1628 | |
1629 | /* | |
1630 | * Only some CPUs have the watch exceptions. | |
1631 | */ | |
1632 | if (cpu_has_watch) | |
1633 | set_except_vector(23, handle_watch); | |
1634 | ||
1635 | /* | |
e01402b1 | 1636 | * Initialise interrupt handlers |
1da177e4 | 1637 | */ |
e01402b1 RB |
1638 | if (cpu_has_veic || cpu_has_vint) { |
1639 | int nvec = cpu_has_veic ? 64 : 8; | |
1640 | for (i = 0; i < nvec; i++) | |
ff3eab2a | 1641 | set_vi_handler(i, NULL); |
e01402b1 RB |
1642 | } |
1643 | else if (cpu_has_divec) | |
1644 | set_handler(0x200, &except_vec4, 0x8); | |
1da177e4 LT |
1645 | |
1646 | /* | |
1647 | * Some CPUs can enable/disable for cache parity detection, but does | |
1648 | * it different ways. | |
1649 | */ | |
1650 | parity_protection_init(); | |
1651 | ||
1652 | /* | |
1653 | * The Data Bus Errors / Instruction Bus Errors are signaled | |
1654 | * by external hardware. Therefore these two exceptions | |
1655 | * may have board specific handlers. | |
1656 | */ | |
1657 | if (board_be_init) | |
1658 | board_be_init(); | |
1659 | ||
c65a5480 | 1660 | set_except_vector(0, rollback ? rollback_handle_int : handle_int); |
1da177e4 LT |
1661 | set_except_vector(1, handle_tlbm); |
1662 | set_except_vector(2, handle_tlbl); | |
1663 | set_except_vector(3, handle_tlbs); | |
1664 | ||
1665 | set_except_vector(4, handle_adel); | |
1666 | set_except_vector(5, handle_ades); | |
1667 | ||
1668 | set_except_vector(6, handle_ibe); | |
1669 | set_except_vector(7, handle_dbe); | |
1670 | ||
1671 | set_except_vector(8, handle_sys); | |
1672 | set_except_vector(9, handle_bp); | |
5b10496b AN |
1673 | set_except_vector(10, rdhwr_noopt ? handle_ri : |
1674 | (cpu_has_vtag_icache ? | |
1675 | handle_ri_rdhwr_vivt : handle_ri_rdhwr)); | |
1da177e4 LT |
1676 | set_except_vector(11, handle_cpu); |
1677 | set_except_vector(12, handle_ov); | |
1678 | set_except_vector(13, handle_tr); | |
1da177e4 | 1679 | |
10cc3529 RB |
1680 | if (current_cpu_type() == CPU_R6000 || |
1681 | current_cpu_type() == CPU_R6000A) { | |
1da177e4 LT |
1682 | /* |
1683 | * The R6000 is the only R-series CPU that features a machine | |
1684 | * check exception (similar to the R4000 cache error) and | |
1685 | * unaligned ldc1/sdc1 exception. The handlers have not been | |
1686 | * written yet. Well, anyway there is no R6000 machine on the | |
1687 | * current list of targets for Linux/MIPS. | |
1688 | * (Duh, crap, there is someone with a triple R6k machine) | |
1689 | */ | |
1690 | //set_except_vector(14, handle_mc); | |
1691 | //set_except_vector(15, handle_ndc); | |
1692 | } | |
1693 | ||
e01402b1 RB |
1694 | |
1695 | if (board_nmi_handler_setup) | |
1696 | board_nmi_handler_setup(); | |
1697 | ||
e50c0a8f RB |
1698 | if (cpu_has_fpu && !cpu_has_nofpuex) |
1699 | set_except_vector(15, handle_fpe); | |
1700 | ||
1701 | set_except_vector(22, handle_mdmx); | |
1702 | ||
1703 | if (cpu_has_mcheck) | |
1704 | set_except_vector(24, handle_mcheck); | |
1705 | ||
340ee4b9 RB |
1706 | if (cpu_has_mipsmt) |
1707 | set_except_vector(25, handle_mt); | |
1708 | ||
acaec427 | 1709 | set_except_vector(26, handle_dsp); |
e50c0a8f RB |
1710 | |
1711 | if (cpu_has_vce) | |
1712 | /* Special exception: R4[04]00 uses also the divec space. */ | |
566f74f6 | 1713 | memcpy((void *)(ebase + 0x180), &except_vec3_r4000, 0x100); |
e50c0a8f | 1714 | else if (cpu_has_4kex) |
566f74f6 | 1715 | memcpy((void *)(ebase + 0x180), &except_vec3_generic, 0x80); |
e50c0a8f | 1716 | else |
566f74f6 | 1717 | memcpy((void *)(ebase + 0x080), &except_vec3_generic, 0x80); |
e50c0a8f | 1718 | |
e0cee3ee | 1719 | local_flush_icache_range(ebase, ebase + 0x400); |
1d40cfcd | 1720 | flush_tlb_handlers(); |
0510617b TB |
1721 | |
1722 | sort_extable(__start___dbe_table, __stop___dbe_table); | |
69f3a7de RB |
1723 | |
1724 | register_cu2_notifier(&default_cu2_notifier); | |
1da177e4 | 1725 | } |