Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
88278ca2 | 2 | /* |
1da177e4 LT |
3 | * arch/sparc/kernel/traps.c |
4 | * | |
4fe3ebec | 5 | * Copyright 1995, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
6 | * Copyright 2000 Jakub Jelinek (jakub@redhat.com) |
7 | */ | |
8 | ||
9 | /* | |
10 | * I hate traps on the sparc, grrr... | |
11 | */ | |
12 | ||
68e21be2 | 13 | #include <linux/sched/mm.h> |
b17b0153 | 14 | #include <linux/sched/debug.h> |
589ee628 | 15 | #include <linux/mm_types.h> |
1da177e4 | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/signal.h> |
18 | #include <linux/smp.h> | |
1eeb66a1 | 19 | #include <linux/kdebug.h> |
7b64db60 | 20 | #include <linux/export.h> |
1da177e4 LT |
21 | |
22 | #include <asm/delay.h> | |
1da177e4 LT |
23 | #include <asm/ptrace.h> |
24 | #include <asm/oplib.h> | |
25 | #include <asm/page.h> | |
26 | #include <asm/pgtable.h> | |
1da177e4 LT |
27 | #include <asm/unistd.h> |
28 | #include <asm/traps.h> | |
29 | ||
8d74e32a SR |
30 | #include "entry.h" |
31 | #include "kernel.h" | |
1da177e4 | 32 | |
8d74e32a | 33 | /* #define TRAP_DEBUG */ |
1da177e4 | 34 | |
c61c65cd | 35 | static void instruction_dump(unsigned long *pc) |
1da177e4 LT |
36 | { |
37 | int i; | |
38 | ||
39 | if((((unsigned long) pc) & 3)) | |
40 | return; | |
41 | ||
42 | for(i = -3; i < 6; i++) | |
43 | printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>'); | |
44 | printk("\n"); | |
45 | } | |
46 | ||
47 | #define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t") | |
48 | #define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t") | |
49 | ||
fcd0196b | 50 | void __noreturn die_if_kernel(char *str, struct pt_regs *regs) |
1da177e4 LT |
51 | { |
52 | static int die_counter; | |
53 | int count = 0; | |
54 | ||
55 | /* Amuse the user. */ | |
56 | printk( | |
57 | " \\|/ ____ \\|/\n" | |
58 | " \"@'/ ,. \\`@\"\n" | |
59 | " /_| \\__/ |_\\\n" | |
60 | " \\__U_/\n"); | |
61 | ||
19c5870c | 62 | printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter); |
1da177e4 | 63 | show_regs(regs); |
373d4d09 | 64 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
1da177e4 LT |
65 | |
66 | __SAVE; __SAVE; __SAVE; __SAVE; | |
67 | __SAVE; __SAVE; __SAVE; __SAVE; | |
68 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
69 | __RESTORE; __RESTORE; __RESTORE; __RESTORE; | |
70 | ||
71 | { | |
4d7b92ad | 72 | struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP]; |
1da177e4 LT |
73 | |
74 | /* Stop the back trace when we hit userland or we | |
75 | * find some badly aligned kernel stack. Set an upper | |
76 | * bound in case our stack is trashed and we loop. | |
77 | */ | |
78 | while(rw && | |
79 | count++ < 30 && | |
80 | (((unsigned long) rw) >= PAGE_OFFSET) && | |
81 | !(((unsigned long) rw) & 0x7)) { | |
4fe3ebec DM |
82 | printk("Caller[%08lx]: %pS\n", rw->ins[7], |
83 | (void *) rw->ins[7]); | |
4d7b92ad | 84 | rw = (struct reg_window32 *)rw->ins[6]; |
1da177e4 LT |
85 | } |
86 | } | |
87 | printk("Instruction DUMP:"); | |
88 | instruction_dump ((unsigned long *) regs->pc); | |
89 | if(regs->psr & PSR_PS) | |
90 | do_exit(SIGKILL); | |
91 | do_exit(SIGSEGV); | |
92 | } | |
93 | ||
94 | void do_hw_interrupt(struct pt_regs *regs, unsigned long type) | |
95 | { | |
96 | siginfo_t info; | |
97 | ||
98 | if(type < 0x80) { | |
99 | /* Sun OS's puke from bad traps, Linux survives! */ | |
100 | printk("Unimplemented Sparc TRAP, type = %02lx\n", type); | |
101 | die_if_kernel("Whee... Hello Mr. Penguin", regs); | |
102 | } | |
103 | ||
104 | if(regs->psr & PSR_PS) | |
105 | die_if_kernel("Kernel bad trap", regs); | |
106 | ||
3eb0f519 | 107 | clear_siginfo(&info); |
1da177e4 LT |
108 | info.si_signo = SIGILL; |
109 | info.si_errno = 0; | |
110 | info.si_code = ILL_ILLTRP; | |
111 | info.si_addr = (void __user *)regs->pc; | |
112 | info.si_trapno = type - 0x80; | |
113 | force_sig_info(SIGILL, &info, current); | |
114 | } | |
115 | ||
116 | void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
117 | unsigned long psr) | |
118 | { | |
1da177e4 LT |
119 | siginfo_t info; |
120 | ||
121 | if(psr & PSR_PS) | |
122 | die_if_kernel("Kernel illegal instruction", regs); | |
123 | #ifdef TRAP_DEBUG | |
124 | printk("Ill instr. at pc=%08lx instruction is %08lx\n", | |
125 | regs->pc, *(unsigned long *)regs->pc); | |
126 | #endif | |
1da177e4 | 127 | |
3eb0f519 | 128 | clear_siginfo(&info); |
1da177e4 LT |
129 | info.si_signo = SIGILL; |
130 | info.si_errno = 0; | |
131 | info.si_code = ILL_ILLOPC; | |
132 | info.si_addr = (void __user *)pc; | |
133 | info.si_trapno = 0; | |
134 | send_sig_info(SIGILL, &info, current); | |
135 | } | |
136 | ||
137 | void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
138 | unsigned long psr) | |
139 | { | |
140 | siginfo_t info; | |
141 | ||
142 | if(psr & PSR_PS) | |
143 | die_if_kernel("Penguin instruction from Penguin mode??!?!", regs); | |
3eb0f519 | 144 | clear_siginfo(&info); |
1da177e4 LT |
145 | info.si_signo = SIGILL; |
146 | info.si_errno = 0; | |
147 | info.si_code = ILL_PRVOPC; | |
148 | info.si_addr = (void __user *)pc; | |
149 | info.si_trapno = 0; | |
150 | send_sig_info(SIGILL, &info, current); | |
151 | } | |
152 | ||
153 | /* XXX User may want to be allowed to do this. XXX */ | |
154 | ||
155 | void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
156 | unsigned long psr) | |
157 | { | |
158 | siginfo_t info; | |
159 | ||
160 | if(regs->psr & PSR_PS) { | |
161 | printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc, | |
162 | regs->u_regs[UREG_RETPC]); | |
163 | die_if_kernel("BOGUS", regs); | |
164 | /* die_if_kernel("Kernel MNA access", regs); */ | |
165 | } | |
166 | #if 0 | |
167 | show_regs (regs); | |
168 | instruction_dump ((unsigned long *) regs->pc); | |
169 | printk ("do_MNA!\n"); | |
170 | #endif | |
3eb0f519 | 171 | clear_siginfo(&info); |
1da177e4 LT |
172 | info.si_signo = SIGBUS; |
173 | info.si_errno = 0; | |
174 | info.si_code = BUS_ADRALN; | |
175 | info.si_addr = /* FIXME: Should dig out mna address */ (void *)0; | |
176 | info.si_trapno = 0; | |
177 | send_sig_info(SIGBUS, &info, current); | |
178 | } | |
179 | ||
1da177e4 LT |
180 | static unsigned long init_fsr = 0x0UL; |
181 | static unsigned long init_fregs[32] __attribute__ ((aligned (8))) = | |
182 | { ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
183 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
184 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, | |
185 | ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL }; | |
186 | ||
187 | void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
188 | unsigned long psr) | |
189 | { | |
190 | /* Sanity check... */ | |
191 | if(psr & PSR_PS) | |
192 | die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs); | |
193 | ||
194 | put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */ | |
195 | regs->psr |= PSR_EF; | |
196 | #ifndef CONFIG_SMP | |
197 | if(last_task_used_math == current) | |
198 | return; | |
199 | if(last_task_used_math) { | |
200 | /* Other processes fpu state, save away */ | |
201 | struct task_struct *fptask = last_task_used_math; | |
202 | fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr, | |
203 | &fptask->thread.fpqueue[0], &fptask->thread.fpqdepth); | |
204 | } | |
205 | last_task_used_math = current; | |
206 | if(used_math()) { | |
207 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
208 | } else { | |
209 | /* Set initial sane state. */ | |
210 | fpload(&init_fregs[0], &init_fsr); | |
211 | set_used_math(); | |
212 | } | |
213 | #else | |
214 | if(!used_math()) { | |
215 | fpload(&init_fregs[0], &init_fsr); | |
216 | set_used_math(); | |
217 | } else { | |
218 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
219 | } | |
54f565ea | 220 | set_thread_flag(TIF_USEDFPU); |
1da177e4 LT |
221 | #endif |
222 | } | |
223 | ||
224 | static unsigned long fake_regs[32] __attribute__ ((aligned (8))); | |
225 | static unsigned long fake_fsr; | |
226 | static unsigned long fake_queue[32] __attribute__ ((aligned (8))); | |
227 | static unsigned long fake_depth; | |
228 | ||
1da177e4 LT |
229 | void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc, |
230 | unsigned long psr) | |
231 | { | |
232 | static int calls; | |
233 | siginfo_t info; | |
234 | unsigned long fsr; | |
235 | int ret = 0; | |
236 | #ifndef CONFIG_SMP | |
237 | struct task_struct *fpt = last_task_used_math; | |
238 | #else | |
239 | struct task_struct *fpt = current; | |
240 | #endif | |
241 | put_psr(get_psr() | PSR_EF); | |
242 | /* If nobody owns the fpu right now, just clear the | |
243 | * error into our fake static buffer and hope it don't | |
244 | * happen again. Thank you crashme... | |
245 | */ | |
246 | #ifndef CONFIG_SMP | |
247 | if(!fpt) { | |
248 | #else | |
54f565ea | 249 | if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) { |
1da177e4 LT |
250 | #endif |
251 | fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth); | |
252 | regs->psr &= ~PSR_EF; | |
253 | return; | |
254 | } | |
255 | fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr, | |
256 | &fpt->thread.fpqueue[0], &fpt->thread.fpqdepth); | |
257 | #ifdef DEBUG_FPU | |
258 | printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr); | |
259 | #endif | |
260 | ||
261 | switch ((fpt->thread.fsr & 0x1c000)) { | |
262 | /* switch on the contents of the ftt [floating point trap type] field */ | |
263 | #ifdef DEBUG_FPU | |
264 | case (1 << 14): | |
265 | printk("IEEE_754_exception\n"); | |
266 | break; | |
267 | #endif | |
268 | case (2 << 14): /* unfinished_FPop (underflow & co) */ | |
269 | case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */ | |
270 | ret = do_mathemu(regs, fpt); | |
271 | break; | |
272 | #ifdef DEBUG_FPU | |
273 | case (4 << 14): | |
274 | printk("sequence_error (OS bug...)\n"); | |
275 | break; | |
276 | case (5 << 14): | |
277 | printk("hardware_error (uhoh!)\n"); | |
278 | break; | |
279 | case (6 << 14): | |
280 | printk("invalid_fp_register (user error)\n"); | |
281 | break; | |
282 | #endif /* DEBUG_FPU */ | |
283 | } | |
284 | /* If we successfully emulated the FPop, we pretend the trap never happened :-> */ | |
285 | if (ret) { | |
286 | fpload(¤t->thread.float_regs[0], ¤t->thread.fsr); | |
287 | return; | |
288 | } | |
289 | /* nope, better SIGFPE the offending process... */ | |
290 | ||
291 | #ifdef CONFIG_SMP | |
54f565ea | 292 | clear_tsk_thread_flag(fpt, TIF_USEDFPU); |
1da177e4 LT |
293 | #endif |
294 | if(psr & PSR_PS) { | |
295 | /* The first fsr store/load we tried trapped, | |
296 | * the second one will not (we hope). | |
297 | */ | |
298 | printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n", | |
299 | regs->pc); | |
300 | regs->pc = regs->npc; | |
301 | regs->npc += 4; | |
302 | calls++; | |
303 | if(calls > 2) | |
304 | die_if_kernel("Too many Penguin-FPU traps from kernel mode", | |
305 | regs); | |
306 | return; | |
307 | } | |
308 | ||
309 | fsr = fpt->thread.fsr; | |
3eb0f519 | 310 | clear_siginfo(&info); |
1da177e4 LT |
311 | info.si_signo = SIGFPE; |
312 | info.si_errno = 0; | |
313 | info.si_addr = (void __user *)pc; | |
314 | info.si_trapno = 0; | |
32772c9e | 315 | info.si_code = FPE_FLTUNK; |
1da177e4 LT |
316 | if ((fsr & 0x1c000) == (1 << 14)) { |
317 | if (fsr & 0x10) | |
318 | info.si_code = FPE_FLTINV; | |
319 | else if (fsr & 0x08) | |
320 | info.si_code = FPE_FLTOVF; | |
321 | else if (fsr & 0x04) | |
322 | info.si_code = FPE_FLTUND; | |
323 | else if (fsr & 0x02) | |
324 | info.si_code = FPE_FLTDIV; | |
325 | else if (fsr & 0x01) | |
326 | info.si_code = FPE_FLTRES; | |
327 | } | |
328 | send_sig_info(SIGFPE, &info, fpt); | |
329 | #ifndef CONFIG_SMP | |
330 | last_task_used_math = NULL; | |
331 | #endif | |
332 | regs->psr &= ~PSR_EF; | |
333 | if(calls > 0) | |
334 | calls=0; | |
335 | } | |
336 | ||
337 | void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
338 | unsigned long psr) | |
339 | { | |
340 | siginfo_t info; | |
341 | ||
342 | if(psr & PSR_PS) | |
343 | die_if_kernel("Penguin overflow trap from kernel mode", regs); | |
3eb0f519 | 344 | clear_siginfo(&info); |
1da177e4 LT |
345 | info.si_signo = SIGEMT; |
346 | info.si_errno = 0; | |
347 | info.si_code = EMT_TAGOVF; | |
348 | info.si_addr = (void __user *)pc; | |
349 | info.si_trapno = 0; | |
350 | send_sig_info(SIGEMT, &info, current); | |
351 | } | |
352 | ||
353 | void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
354 | unsigned long psr) | |
355 | { | |
356 | #ifdef TRAP_DEBUG | |
357 | printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n", | |
358 | pc, npc, psr); | |
359 | #endif | |
360 | if(psr & PSR_PS) | |
361 | panic("Tell me what a watchpoint trap is, and I'll then deal " | |
362 | "with such a beast..."); | |
363 | } | |
364 | ||
365 | void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
366 | unsigned long psr) | |
367 | { | |
368 | siginfo_t info; | |
369 | ||
370 | #ifdef TRAP_DEBUG | |
371 | printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
372 | pc, npc, psr); | |
373 | #endif | |
3eb0f519 | 374 | clear_siginfo(&info); |
1da177e4 LT |
375 | info.si_signo = SIGBUS; |
376 | info.si_errno = 0; | |
377 | info.si_code = BUS_OBJERR; | |
378 | info.si_addr = (void __user *)pc; | |
379 | info.si_trapno = 0; | |
380 | force_sig_info(SIGBUS, &info, current); | |
381 | } | |
382 | ||
383 | void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
384 | unsigned long psr) | |
385 | { | |
386 | siginfo_t info; | |
387 | ||
3eb0f519 | 388 | clear_siginfo(&info); |
1da177e4 LT |
389 | info.si_signo = SIGILL; |
390 | info.si_errno = 0; | |
391 | info.si_code = ILL_COPROC; | |
392 | info.si_addr = (void __user *)pc; | |
393 | info.si_trapno = 0; | |
394 | send_sig_info(SIGILL, &info, current); | |
395 | } | |
396 | ||
397 | void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
398 | unsigned long psr) | |
399 | { | |
400 | siginfo_t info; | |
401 | ||
402 | #ifdef TRAP_DEBUG | |
403 | printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n", | |
404 | pc, npc, psr); | |
405 | #endif | |
3eb0f519 | 406 | clear_siginfo(&info); |
1da177e4 LT |
407 | info.si_signo = SIGILL; |
408 | info.si_errno = 0; | |
409 | info.si_code = ILL_COPROC; | |
410 | info.si_addr = (void __user *)pc; | |
411 | info.si_trapno = 0; | |
412 | send_sig_info(SIGILL, &info, current); | |
413 | } | |
414 | ||
415 | void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc, | |
416 | unsigned long psr) | |
417 | { | |
418 | siginfo_t info; | |
419 | ||
3eb0f519 | 420 | clear_siginfo(&info); |
1da177e4 LT |
421 | info.si_signo = SIGFPE; |
422 | info.si_errno = 0; | |
423 | info.si_code = FPE_INTDIV; | |
424 | info.si_addr = (void __user *)pc; | |
425 | info.si_trapno = 0; | |
426 | send_sig_info(SIGFPE, &info, current); | |
427 | } | |
428 | ||
429 | #ifdef CONFIG_DEBUG_BUGVERBOSE | |
430 | void do_BUG(const char *file, int line) | |
431 | { | |
432 | // bust_spinlocks(1); XXX Not in our original BUG() | |
433 | printk("kernel BUG at %s:%d!\n", file, line); | |
434 | } | |
6943f3da | 435 | EXPORT_SYMBOL(do_BUG); |
1da177e4 LT |
436 | #endif |
437 | ||
438 | /* Since we have our mappings set up, on multiprocessors we can spin them | |
439 | * up here so that timer interrupts work during initialization. | |
440 | */ | |
441 | ||
1da177e4 LT |
442 | void trap_init(void) |
443 | { | |
444 | extern void thread_info_offsets_are_bolixed_pete(void); | |
445 | ||
446 | /* Force linker to barf if mismatched */ | |
447 | if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) || | |
448 | TI_TASK != offsetof(struct thread_info, task) || | |
1da177e4 LT |
449 | TI_FLAGS != offsetof(struct thread_info, flags) || |
450 | TI_CPU != offsetof(struct thread_info, cpu) || | |
451 | TI_PREEMPT != offsetof(struct thread_info, preempt_count) || | |
452 | TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) || | |
453 | TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) || | |
454 | TI_KSP != offsetof(struct thread_info, ksp) || | |
455 | TI_KPC != offsetof(struct thread_info, kpc) || | |
456 | TI_KPSR != offsetof(struct thread_info, kpsr) || | |
457 | TI_KWIM != offsetof(struct thread_info, kwim) || | |
458 | TI_REG_WINDOW != offsetof(struct thread_info, reg_window) || | |
459 | TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) || | |
460 | TI_W_SAVED != offsetof(struct thread_info, w_saved)) | |
461 | thread_info_offsets_are_bolixed_pete(); | |
462 | ||
463 | /* Attach to the address space of init_task. */ | |
f1f10076 | 464 | mmgrab(&init_mm); |
1da177e4 LT |
465 | current->active_mm = &init_mm; |
466 | ||
467 | /* NOTE: Other cpus have this done as they are started | |
468 | * up on SMP. | |
469 | */ | |
470 | } |