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1da177e4 LT |
1 | /* $Id: traps.c,v 1.64 2000/09/03 15:00:49 anton Exp $ |
2 | * arch/sparc/kernel/traps.c | |
3 | * | |
4 | * Copyright 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright 2000 Jakub Jelinek (jakub@redhat.com) | |
6 | */ | |
7 | ||
8 | /* | |
9 | * I hate traps on the sparc, grrr... | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/sched.h> /* for jiffies */ |
13 | #include <linux/kernel.h> | |
14 | #include <linux/kallsyms.h> | |
15 | #include <linux/signal.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/smp_lock.h> | |
1eeb66a1 | 18 | #include <linux/kdebug.h> |
1da177e4 LT |
19 | |
20 | #include <asm/delay.h> | |
21 | #include <asm/system.h> | |
22 | #include <asm/ptrace.h> | |
23 | #include <asm/oplib.h> | |
24 | #include <asm/page.h> | |
25 | #include <asm/pgtable.h> | |
1da177e4 LT |
26 | #include <asm/unistd.h> |
27 | #include <asm/traps.h> | |
28 | ||
29 | /* #define TRAP_DEBUG */ | |
30 | ||
31 | struct trap_trace_entry { | |
32 | unsigned long pc; | |
33 | unsigned long type; | |
34 | }; | |
35 | ||
36 | int trap_curbuf = 0; | |
37 | struct trap_trace_entry trapbuf[1024]; | |
38 | ||
39 | void syscall_trace_entry(struct pt_regs *regs) | |
40 | { | |
41 | printk("%s[%d]: ", current->comm, current->pid); | |
42 | printk("scall<%d> (could be %d)\n", (int) regs->u_regs[UREG_G1], | |
43 | (int) regs->u_regs[UREG_I0]); | |
44 | } | |
45 | ||
46 | void syscall_trace_exit(struct pt_regs *regs) | |
47 | { | |
48 | } | |
49 | ||
50 | void sun4m_nmi(struct pt_regs *regs) | |
51 | { | |
52 | unsigned long afsr, afar; | |
53 | ||
54 | printk("Aieee: sun4m NMI received!\n"); | |
55 | /* XXX HyperSparc hack XXX */ | |
56 | __asm__ __volatile__("mov 0x500, %%g1\n\t" | |
57 | "lda [%%g1] 0x4, %0\n\t" | |
58 | "mov 0x600, %%g1\n\t" | |
59 | "lda [%%g1] 0x4, %1\n\t" : | |
60 | "=r" (afsr), "=r" (afar)); | |
61 | printk("afsr=%08lx afar=%08lx\n", afsr, afar); | |
62 | printk("you lose buddy boy...\n"); | |
63 | show_regs(regs); | |
64 | prom_halt(); | |
65 | } | |
66 | ||
67 | void sun4d_nmi(struct pt_regs *regs) | |
68 | { | |
69 | printk("Aieee: sun4d NMI received!\n"); | |
70 | printk("you lose buddy boy...\n"); | |
71 | show_regs(regs); | |
72 | prom_halt(); | |
73 | } | |
74 | ||
75 | void instruction_dump (unsigned long *pc) | |
76 | { | |
77 | int i; | |
78 | ||
79 | if((((unsigned long) pc) & 3)) | |
80 | return; | |
81 | ||
82 | for(i = -3; i < 6; i++) | |
83 | printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>'); | |
84 | printk("\n"); | |
85 | } | |
86 | ||
87 | #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") | |
88 | #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") | |
89 | ||
90 | void die_if_kernel(char *str, struct pt_regs *regs) | |
91 | { | |
92 | static int die_counter; | |
93 | int count = 0; | |
94 | ||
95 | /* Amuse the user. */ | |
96 | printk( | |
97 | " \\|/ ____ \\|/\n" | |
98 | " \"@'/ ,. \\`@\"\n" | |
99 | " /_| \\__/ |_\\\n" | |
100 | " \\__U_/\n"); | |
101 | ||
102 | printk("%s(%d): %s [#%d]\n", current->comm, current->pid, str, ++die_counter); | |
103 | show_regs(regs); | |
104 | ||
105 | __SAVE; __SAVE; __SAVE; __SAVE; | |
106 | __SAVE; __SAVE; __SAVE; __SAVE; | |
107 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
108 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
109 | ||
110 | { | |
111 | struct reg_window *rw = (struct reg_window *)regs->u_regs[UREG_FP]; | |
112 | ||
113 | /* Stop the back trace when we hit userland or we | |
114 | * find some badly aligned kernel stack. Set an upper | |
115 | * bound in case our stack is trashed and we loop. | |
116 | */ | |
117 | while(rw && | |
118 | count++ < 30 && | |
119 | (((unsigned long) rw) >= PAGE_OFFSET) && | |
120 | !(((unsigned long) rw) & 0x7)) { | |
121 | printk("Caller[%08lx]", rw->ins[7]); | |
122 | print_symbol(": %s\n", rw->ins[7]); | |
123 | rw = (struct reg_window *)rw->ins[6]; | |
124 | } | |
125 | } | |
126 | printk("Instruction DUMP:"); | |
127 | instruction_dump ((unsigned long *) regs->pc); | |
128 | if(regs->psr & PSR_PS) | |
129 | do_exit(SIGKILL); | |
130 | do_exit(SIGSEGV); | |
131 | } | |
132 | ||
133 | void do_hw_interrupt(struct pt_regs *regs, unsigned long type) | |
134 | { | |
135 | siginfo_t info; | |
136 | ||
137 | if(type < 0x80) { | |
138 | /* Sun OS's puke from bad traps, Linux survives! */ | |
139 | printk("Unimplemented Sparc TRAP, type = %02lx\n", type); | |
140 | die_if_kernel("Whee... Hello Mr. Penguin", regs); | |
141 | } | |
142 | ||
143 | if(regs->psr & PSR_PS) | |
144 | die_if_kernel("Kernel bad trap", regs); | |
145 | ||
146 | info.si_signo = SIGILL; | |
147 | info.si_errno = 0; | |
148 | info.si_code = ILL_ILLTRP; | |
149 | info.si_addr = (void __user *)regs->pc; | |
150 | info.si_trapno = type - 0x80; | |
151 | force_sig_info(SIGILL, &info, current); | |
152 | } | |
153 | ||
154 | void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
155 | unsigned long psr) | |
156 | { | |
157 | extern int do_user_muldiv (struct pt_regs *, unsigned long); | |
158 | siginfo_t info; | |
159 | ||
160 | if(psr & PSR_PS) | |
161 | die_if_kernel("Kernel illegal instruction", regs); | |
162 | #ifdef TRAP_DEBUG | |
163 | printk("Ill instr. at pc=%08lx instruction is %08lx\n", | |
164 | regs->pc, *(unsigned long *)regs->pc); | |
165 | #endif | |
166 | if (!do_user_muldiv (regs, pc)) | |
167 | return; | |
168 | ||
169 | info.si_signo = SIGILL; | |
170 | info.si_errno = 0; | |
171 | info.si_code = ILL_ILLOPC; | |
172 | info.si_addr = (void __user *)pc; | |
173 | info.si_trapno = 0; | |
174 | send_sig_info(SIGILL, &info, current); | |
175 | } | |
176 | ||
177 | void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
178 | unsigned long psr) | |
179 | { | |
180 | siginfo_t info; | |
181 | ||
182 | if(psr & PSR_PS) | |
183 | die_if_kernel("Penguin instruction from Penguin mode??!?!", regs); | |
184 | info.si_signo = SIGILL; | |
185 | info.si_errno = 0; | |
186 | info.si_code = ILL_PRVOPC; | |
187 | info.si_addr = (void __user *)pc; | |
188 | info.si_trapno = 0; | |
189 | send_sig_info(SIGILL, &info, current); | |
190 | } | |
191 | ||
192 | /* XXX User may want to be allowed to do this. XXX */ | |
193 | ||
194 | void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
195 | unsigned long psr) | |
196 | { | |
197 | siginfo_t info; | |
198 | ||
199 | if(regs->psr & PSR_PS) { | |
200 | printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc, | |
201 | regs->u_regs[UREG_RETPC]); | |
202 | die_if_kernel("BOGUS", regs); | |
203 | /* die_if_kernel("Kernel MNA access", regs); */ | |
204 | } | |
205 | #if 0 | |
206 | show_regs (regs); | |
207 | instruction_dump ((unsigned long *) regs->pc); | |
208 | printk ("do_MNA!\n"); | |
209 | #endif | |
210 | info.si_signo = SIGBUS; | |
211 | info.si_errno = 0; | |
212 | info.si_code = BUS_ADRALN; | |
213 | info.si_addr = /* FIXME: Should dig out mna address */ (void *)0; | |
214 | info.si_trapno = 0; | |
215 | send_sig_info(SIGBUS, &info, current); | |
216 | } | |
217 | ||
218 | extern void fpsave(unsigned long *fpregs, unsigned long *fsr, | |
219 | void *fpqueue, unsigned long *fpqdepth); | |
220 | extern void fpload(unsigned long *fpregs, unsigned long *fsr); | |
221 | ||
222 | static unsigned long init_fsr = 0x0UL; | |
223 | static unsigned long init_fregs[32] __attribute__ ((aligned (8))) = | |
224 | { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
225 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
226 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
227 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL }; | |
228 | ||
229 | void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
230 | unsigned long psr) | |
231 | { | |
232 | /* Sanity check... */ | |
233 | if(psr & PSR_PS) | |
234 | die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs); | |
235 | ||
236 | put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */ | |
237 | regs->psr |= PSR_EF; | |
238 | #ifndef CONFIG_SMP | |
239 | if(last_task_used_math == current) | |
240 | return; | |
241 | if(last_task_used_math) { | |
242 | /* Other processes fpu state, save away */ | |
243 | struct task_struct *fptask = last_task_used_math; | |
244 | fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr, | |
245 | &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth); | |
246 | } | |
247 | last_task_used_math = current; | |
248 | if(used_math()) { | |
249 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
250 | } else { | |
251 | /* Set initial sane state. */ | |
252 | fpload(&init_fregs[0], &init_fsr); | |
253 | set_used_math(); | |
254 | } | |
255 | #else | |
256 | if(!used_math()) { | |
257 | fpload(&init_fregs[0], &init_fsr); | |
258 | set_used_math(); | |
259 | } else { | |
260 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
261 | } | |
54f565ea | 262 | set_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
263 | #endif |
264 | } | |
265 | ||
266 | static unsigned long fake_regs[32] __attribute__ ((aligned (8))); | |
267 | static unsigned long fake_fsr; | |
268 | static unsigned long fake_queue[32] __attribute__ ((aligned (8))); | |
269 | static unsigned long fake_depth; | |
270 | ||
271 | extern int do_mathemu(struct pt_regs *, struct task_struct *); | |
272 | ||
273 | void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
274 | unsigned long psr) | |
275 | { | |
276 | static int calls; | |
277 | siginfo_t info; | |
278 | unsigned long fsr; | |
279 | int ret = 0; | |
280 | #ifndef CONFIG_SMP | |
281 | struct task_struct *fpt = last_task_used_math; | |
282 | #else | |
283 | struct task_struct *fpt = current; | |
284 | #endif | |
285 | put_psr(get_psr() | PSR_EF); | |
286 | /* If nobody owns the fpu right now, just clear the | |
287 | * error into our fake static buffer and hope it don't | |
288 | * happen again. Thank you crashme... | |
289 | */ | |
290 | #ifndef CONFIG_SMP | |
291 | if(!fpt) { | |
292 | #else | |
54f565ea | 293 | if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) { |
1da177e4 LT |
294 | #endif |
295 | fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth); | |
296 | regs->psr &= ~PSR_EF; | |
297 | return; | |
298 | } | |
299 | fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr, | |
300 | &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth); | |
301 | #ifdef DEBUG_FPU | |
302 | printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr); | |
303 | #endif | |
304 | ||
305 | switch ((fpt->thread.fsr & 0x1c000)) { | |
306 | /* switch on the contents of the ftt [floating point trap type] field */ | |
307 | #ifdef DEBUG_FPU | |
308 | case (1 << 14): | |
309 | printk("IEEE_754_exception\n"); | |
310 | break; | |
311 | #endif | |
312 | case (2 << 14): /* unfinished_FPop (underflow & co) */ | |
313 | case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */ | |
314 | ret = do_mathemu(regs, fpt); | |
315 | break; | |
316 | #ifdef DEBUG_FPU | |
317 | case (4 << 14): | |
318 | printk("sequence_error (OS bug...)\n"); | |
319 | break; | |
320 | case (5 << 14): | |
321 | printk("hardware_error (uhoh!)\n"); | |
322 | break; | |
323 | case (6 << 14): | |
324 | printk("invalid_fp_register (user error)\n"); | |
325 | break; | |
326 | #endif /* DEBUG_FPU */ | |
327 | } | |
328 | /* If we successfully emulated the FPop, we pretend the trap never happened :-> */ | |
329 | if (ret) { | |
330 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
331 | return; | |
332 | } | |
333 | /* nope, better SIGFPE the offending process... */ | |
334 | ||
335 | #ifdef CONFIG_SMP | |
54f565ea | 336 | clear_tsk_thread_flag(fpt, TIF_USEDFPU); |
1da177e4 LT |
337 | #endif |
338 | if(psr & PSR_PS) { | |
339 | /* The first fsr store/load we tried trapped, | |
340 | * the second one will not (we hope). | |
341 | */ | |
342 | printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n", | |
343 | regs->pc); | |
344 | regs->pc = regs->npc; | |
345 | regs->npc += 4; | |
346 | calls++; | |
347 | if(calls > 2) | |
348 | die_if_kernel("Too many Penguin-FPU traps from kernel mode", | |
349 | regs); | |
350 | return; | |
351 | } | |
352 | ||
353 | fsr = fpt->thread.fsr; | |
354 | info.si_signo = SIGFPE; | |
355 | info.si_errno = 0; | |
356 | info.si_addr = (void __user *)pc; | |
357 | info.si_trapno = 0; | |
358 | info.si_code = __SI_FAULT; | |
359 | if ((fsr & 0x1c000) == (1 << 14)) { | |
360 | if (fsr & 0x10) | |
361 | info.si_code = FPE_FLTINV; | |
362 | else if (fsr & 0x08) | |
363 | info.si_code = FPE_FLTOVF; | |
364 | else if (fsr & 0x04) | |
365 | info.si_code = FPE_FLTUND; | |
366 | else if (fsr & 0x02) | |
367 | info.si_code = FPE_FLTDIV; | |
368 | else if (fsr & 0x01) | |
369 | info.si_code = FPE_FLTRES; | |
370 | } | |
371 | send_sig_info(SIGFPE, &info, fpt); | |
372 | #ifndef CONFIG_SMP | |
373 | last_task_used_math = NULL; | |
374 | #endif | |
375 | regs->psr &= ~PSR_EF; | |
376 | if(calls > 0) | |
377 | calls=0; | |
378 | } | |
379 | ||
380 | void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
381 | unsigned long psr) | |
382 | { | |
383 | siginfo_t info; | |
384 | ||
385 | if(psr & PSR_PS) | |
386 | die_if_kernel("Penguin overflow trap from kernel mode", regs); | |
387 | info.si_signo = SIGEMT; | |
388 | info.si_errno = 0; | |
389 | info.si_code = EMT_TAGOVF; | |
390 | info.si_addr = (void __user *)pc; | |
391 | info.si_trapno = 0; | |
392 | send_sig_info(SIGEMT, &info, current); | |
393 | } | |
394 | ||
395 | void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
396 | unsigned long psr) | |
397 | { | |
398 | #ifdef TRAP_DEBUG | |
399 | printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n", | |
400 | pc, npc, psr); | |
401 | #endif | |
402 | if(psr & PSR_PS) | |
403 | panic("Tell me what a watchpoint trap is, and I'll then deal " | |
404 | "with such a beast..."); | |
405 | } | |
406 | ||
407 | void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
408 | unsigned long psr) | |
409 | { | |
410 | siginfo_t info; | |
411 | ||
412 | #ifdef TRAP_DEBUG | |
413 | printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
414 | pc, npc, psr); | |
415 | #endif | |
416 | info.si_signo = SIGBUS; | |
417 | info.si_errno = 0; | |
418 | info.si_code = BUS_OBJERR; | |
419 | info.si_addr = (void __user *)pc; | |
420 | info.si_trapno = 0; | |
421 | force_sig_info(SIGBUS, &info, current); | |
422 | } | |
423 | ||
424 | void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
425 | unsigned long psr) | |
426 | { | |
427 | siginfo_t info; | |
428 | ||
429 | info.si_signo = SIGILL; | |
430 | info.si_errno = 0; | |
431 | info.si_code = ILL_COPROC; | |
432 | info.si_addr = (void __user *)pc; | |
433 | info.si_trapno = 0; | |
434 | send_sig_info(SIGILL, &info, current); | |
435 | } | |
436 | ||
437 | void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
438 | unsigned long psr) | |
439 | { | |
440 | siginfo_t info; | |
441 | ||
442 | #ifdef TRAP_DEBUG | |
443 | printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
444 | pc, npc, psr); | |
445 | #endif | |
446 | info.si_signo = SIGILL; | |
447 | info.si_errno = 0; | |
448 | info.si_code = ILL_COPROC; | |
449 | info.si_addr = (void __user *)pc; | |
450 | info.si_trapno = 0; | |
451 | send_sig_info(SIGILL, &info, current); | |
452 | } | |
453 | ||
454 | void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
455 | unsigned long psr) | |
456 | { | |
457 | siginfo_t info; | |
458 | ||
459 | info.si_signo = SIGFPE; | |
460 | info.si_errno = 0; | |
461 | info.si_code = FPE_INTDIV; | |
462 | info.si_addr = (void __user *)pc; | |
463 | info.si_trapno = 0; | |
464 | send_sig_info(SIGFPE, &info, current); | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_DEBUG_BUGVERBOSE | |
468 | void do_BUG(const char *file, int line) | |
469 | { | |
470 | // bust_spinlocks(1); XXX Not in our original BUG() | |
471 | printk("kernel BUG at %s:%d!\n", file, line); | |
472 | } | |
473 | #endif | |
474 | ||
475 | /* Since we have our mappings set up, on multiprocessors we can spin them | |
476 | * up here so that timer interrupts work during initialization. | |
477 | */ | |
478 | ||
479 | extern void sparc_cpu_startup(void); | |
480 | ||
481 | int linux_smp_still_initting; | |
482 | unsigned int thiscpus_tbr; | |
483 | int thiscpus_mid; | |
484 | ||
485 | void trap_init(void) | |
486 | { | |
487 | extern void thread_info_offsets_are_bolixed_pete(void); | |
488 | ||
489 | /* Force linker to barf if mismatched */ | |
490 | if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) || | |
491 | TI_TASK != offsetof(struct thread_info, task) || | |
492 | TI_EXECDOMAIN != offsetof(struct thread_info, exec_domain) || | |
493 | TI_FLAGS != offsetof(struct thread_info, flags) || | |
494 | TI_CPU != offsetof(struct thread_info, cpu) || | |
495 | TI_PREEMPT != offsetof(struct thread_info, preempt_count) || | |
496 | TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) || | |
497 | TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) || | |
498 | TI_KSP != offsetof(struct thread_info, ksp) || | |
499 | TI_KPC != offsetof(struct thread_info, kpc) || | |
500 | TI_KPSR != offsetof(struct thread_info, kpsr) || | |
501 | TI_KWIM != offsetof(struct thread_info, kwim) || | |
502 | TI_REG_WINDOW != offsetof(struct thread_info, reg_window) || | |
503 | TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) || | |
504 | TI_W_SAVED != offsetof(struct thread_info, w_saved)) | |
505 | thread_info_offsets_are_bolixed_pete(); | |
506 | ||
507 | /* Attach to the address space of init_task. */ | |
508 | atomic_inc(&init_mm.mm_count); | |
509 | current->active_mm = &init_mm; | |
510 | ||
511 | /* NOTE: Other cpus have this done as they are started | |
512 | * up on SMP. | |
513 | */ | |
514 | } |