xref: /haiku/src/system/kernel/arch/x86/arch_int.cpp (revision 445d4fd926c569e7b9ae28017da86280aaecbae2) 
1 /*
2  * Copyright 2018, Jérôme Duval, jerome.duval@gmail.com.
3  * Copyright 2008-2011, Michael Lotz, mmlr@mlotz.ch.
4  * Copyright 2010, Clemens Zeidler, haiku@clemens-zeidler.de.
5  * Copyright 2009-2011, Ingo Weinhold, ingo_weinhold@gmx.de.
6  * Copyright 2002-2010, Axel Dörfler, axeld@pinc-software.de.
7  * Distributed under the terms of the MIT License.
8  *
9  * Copyright 2001, Travis Geiselbrecht. All rights reserved.
10  * Distributed under the terms of the NewOS License.
11  */
12 
13 
14 #include <cpu.h>
15 #include <int.h>
16 #include <kscheduler.h>
17 #include <team.h>
18 #include <thread.h>
19 #include <util/AutoLock.h>
20 #include <vm/vm.h>
21 #include <vm/vm_priv.h>
22 
23 #include <arch/cpu.h>
24 #include <arch/int.h>
25 
26 #include <arch/x86/apic.h>
27 #include <arch/x86/descriptors.h>
28 #include <arch/x86/msi.h>
29 #include <arch/x86/msi_priv.h>
30 
31 #include <stdio.h>
32 
33 // interrupt controllers
34 #include <arch/x86/ioapic.h>
35 #include <arch/x86/pic.h>
36 
37 
38 //#define TRACE_ARCH_INT
39 #ifdef TRACE_ARCH_INT
40 #	define TRACE(x) dprintf x
41 #else
42 #	define TRACE(x) ;
43 #endif
44 
45 
46 static irq_source sVectorSources[NUM_IO_VECTORS];
47 
48 static const char *kInterruptNames[] = {
49 	/*  0 */ "Divide Error Exception",
50 	/*  1 */ "Debug Exception",
51 	/*  2 */ "NMI Interrupt",
52 	/*  3 */ "Breakpoint Exception",
53 	/*  4 */ "Overflow Exception",
54 	/*  5 */ "BOUND Range Exceeded Exception",
55 	/*  6 */ "Invalid Opcode Exception",
56 	/*  7 */ "Device Not Available Exception",
57 	/*  8 */ "Double Fault Exception",
58 	/*  9 */ "Coprocessor Segment Overrun",
59 	/* 10 */ "Invalid TSS Exception",
60 	/* 11 */ "Segment Not Present",
61 	/* 12 */ "Stack Fault Exception",
62 	/* 13 */ "General Protection Exception",
63 	/* 14 */ "Page-Fault Exception",
64 	/* 15 */ "-",
65 	/* 16 */ "x87 FPU Floating-Point Error",
66 	/* 17 */ "Alignment Check Exception",
67 	/* 18 */ "Machine-Check Exception",
68 	/* 19 */ "SIMD Floating-Point Exception",
69 };
70 static const int kInterruptNameCount = 20;
71 
72 static const interrupt_controller* sCurrentPIC = NULL;
73 
74 
75 static const char*
76 exception_name(int number, char* buffer, int32 bufferSize)
77 {
78 	if (number >= 0 && number < kInterruptNameCount)
79 		return kInterruptNames[number];
80 
81 	snprintf(buffer, bufferSize, "exception %d", number);
82 	return buffer;
83 }
84 
85 
86 void
87 x86_invalid_exception(iframe* frame)
88 {
89 	Thread* thread = thread_get_current_thread();
90 	char name[32];
91 	panic("unhandled trap 0x%lx (%s) at ip 0x%lx, thread %" B_PRId32 "!\n",
92 		frame->vector, exception_name(frame->vector, name, sizeof(name)),
93 		frame->ip, thread ? thread->id : -1);
94 }
95 
96 
97 void
98 x86_fatal_exception(iframe* frame)
99 {
100 	char name[32];
101 	panic("Fatal exception \"%s\" occurred! Error code: 0x%lx\n",
102 		exception_name(frame->vector, name, sizeof(name)), frame->error_code);
103 }
104 
105 
106 void
107 x86_unexpected_exception(iframe* frame)
108 {
109 	debug_exception_type type;
110 	uint32 signalNumber;
111 	int32 signalCode;
112 	addr_t signalAddress = 0;
113 	int32 signalError = B_ERROR;
114 
115 	switch (frame->vector) {
116 		case 0:		// Divide Error Exception (#DE)
117 			type = B_DIVIDE_ERROR;
118 			signalNumber = SIGFPE;
119 			signalCode = FPE_INTDIV;
120 			signalAddress = frame->ip;
121 			break;
122 
123 		case 4:		// Overflow Exception (#OF)
124 			type = B_OVERFLOW_EXCEPTION;
125 			signalNumber = SIGFPE;
126 			signalCode = FPE_INTOVF;
127 			signalAddress = frame->ip;
128 			break;
129 
130 		case 5:		// BOUND Range Exceeded Exception (#BR)
131 			type = B_BOUNDS_CHECK_EXCEPTION;
132 			signalNumber = SIGTRAP;
133 			signalCode = SI_USER;
134 			break;
135 
136 		case 6:		// Invalid Opcode Exception (#UD)
137 			type = B_INVALID_OPCODE_EXCEPTION;
138 			signalNumber = SIGILL;
139 			signalCode = ILL_ILLOPC;
140 			signalAddress = frame->ip;
141 			break;
142 
143 		case 12: 	// Stack Fault (#SS)
144 			type = B_STACK_FAULT;
145 			signalNumber = SIGBUS;
146 			signalCode = BUS_ADRERR;
147 			signalAddress = frame->ip;
148 			break;
149 
150 		case 13: 	// General Protection Exception (#GP)
151 			type = B_GENERAL_PROTECTION_FAULT;
152 			signalNumber = SIGILL;
153 			signalCode = ILL_PRVOPC;	// or ILL_PRVREG
154 			signalAddress = frame->ip;
155 			break;
156 
157 		case 16: 	// x87 FPU Floating-Point Error (#MF)
158 			type = B_FLOATING_POINT_EXCEPTION;
159 			signalNumber = SIGFPE;
160 			signalCode = FPE_FLTDIV;
161 				// TODO: Determine the correct cause via the FPU status
162 				// register!
163 			signalAddress = frame->ip;
164 			break;
165 
166 		case 17: 	// Alignment Check Exception (#AC)
167 			type = B_ALIGNMENT_EXCEPTION;
168 			signalNumber = SIGBUS;
169 			signalCode = BUS_ADRALN;
170 			// TODO: Also get the address (from where?). Since we don't enable
171 			// alignment checking this exception should never happen, though.
172 			signalError = EFAULT;
173 			break;
174 
175 		case 19: 	// SIMD Floating-Point Exception (#XF)
176 			type = B_FLOATING_POINT_EXCEPTION;
177 			signalNumber = SIGFPE;
178 			signalCode = FPE_FLTDIV;
179 				// TODO: Determine the correct cause via the MXCSR register!
180 			signalAddress = frame->ip;
181 			break;
182 
183 		default:
184 			x86_invalid_exception(frame);
185 			return;
186 	}
187 
188 	if (IFRAME_IS_USER(frame)) {
189 		struct sigaction action;
190 		Thread* thread = thread_get_current_thread();
191 
192 		enable_interrupts();
193 
194 		// If the thread has a signal handler for the signal, we simply send it
195 		// the signal. Otherwise we notify the user debugger first.
196 		if ((sigaction(signalNumber, NULL, &action) == 0
197 				&& action.sa_handler != SIG_DFL
198 				&& action.sa_handler != SIG_IGN)
199 			|| user_debug_exception_occurred(type, signalNumber)) {
200 			Signal signal(signalNumber, signalCode, signalError,
201 				thread->team->id);
202 			signal.SetAddress((void*)signalAddress);
203 			send_signal_to_thread(thread, signal, 0);
204 		}
205 	} else {
206 		char name[32];
207 		panic("Unexpected exception \"%s\" occurred in kernel mode! "
208 			"Error code: 0x%lx\n",
209 			exception_name(frame->vector, name, sizeof(name)),
210 			frame->error_code);
211 	}
212 }
213 
214 
215 void
216 x86_hardware_interrupt(struct iframe* frame)
217 {
218 	int32 vector = frame->vector - ARCH_INTERRUPT_BASE;
219 	bool levelTriggered = false;
220 	Thread* thread = thread_get_current_thread();
221 
222 	if (sCurrentPIC->is_spurious_interrupt(vector)) {
223 		TRACE(("got spurious interrupt at vector %ld\n", vector));
224 		return;
225 	}
226 
227 	levelTriggered = sCurrentPIC->is_level_triggered_interrupt(vector);
228 
229 	if (!levelTriggered) {
230 		// if it's not handled by the current pic then it's an apic generated
231 		// interrupt like local interrupts, msi or ipi.
232 		if (!sCurrentPIC->end_of_interrupt(vector))
233 			apic_end_of_interrupt();
234 	}
235 
236 	int_io_interrupt_handler(vector, levelTriggered);
237 
238 	if (levelTriggered) {
239 		if (!sCurrentPIC->end_of_interrupt(vector))
240 			apic_end_of_interrupt();
241 	}
242 
243 	cpu_status state = disable_interrupts();
244 	if (thread->cpu->invoke_scheduler) {
245 		SpinLocker schedulerLocker(thread->scheduler_lock);
246 		scheduler_reschedule(B_THREAD_READY);
247 		schedulerLocker.Unlock();
248 		restore_interrupts(state);
249 	} else if (thread->post_interrupt_callback != NULL) {
250 		void (*callback)(void*) = thread->post_interrupt_callback;
251 		void* data = thread->post_interrupt_data;
252 
253 		thread->post_interrupt_callback = NULL;
254 		thread->post_interrupt_data = NULL;
255 
256 		restore_interrupts(state);
257 
258 		callback(data);
259 	}
260 }
261 
262 
263 void
264 x86_page_fault_exception(struct iframe* frame)
265 {
266 	Thread* thread = thread_get_current_thread();
267 	addr_t cr2 = x86_read_cr2();
268 	addr_t newip;
269 
270 	if (debug_debugger_running()) {
271 		// If this CPU or this thread has a fault handler, we're allowed to be
272 		// here.
273 		if (thread != NULL) {
274 			cpu_ent* cpu = &gCPU[smp_get_current_cpu()];
275 			if (cpu->fault_handler != 0) {
276 				debug_set_page_fault_info(cr2, frame->ip,
277 					(frame->error_code & PGFAULT_W) != 0
278 						? DEBUG_PAGE_FAULT_WRITE : 0);
279 				frame->ip = cpu->fault_handler;
280 				frame->bp = cpu->fault_handler_stack_pointer;
281 				return;
282 			}
283 
284 			if (thread->fault_handler != 0) {
285 				kprintf("ERROR: thread::fault_handler used in kernel "
286 					"debugger!\n");
287 				debug_set_page_fault_info(cr2, frame->ip,
288 					(frame->error_code & PGFAULT_W) != 0
289 						? DEBUG_PAGE_FAULT_WRITE : 0);
290 				frame->ip = reinterpret_cast<uintptr_t>(thread->fault_handler);
291 				return;
292 			}
293 		}
294 
295 		// otherwise, not really
296 		panic("page fault in debugger without fault handler! Touching "
297 			"address %p from ip %p\n", (void*)cr2, (void*)frame->ip);
298 		return;
299 	} else if (!IFRAME_IS_USER(frame)
300 		&& (frame->error_code & PGFAULT_I) != 0
301 		&& (x86_read_cr4() & IA32_CR4_SMEP) != 0) {
302 		// check that: 1. come not from userland,
303 		// 2. is an instruction fetch, 3. smep is enabled
304 		panic("SMEP violation user-mapped address %p touched from kernel %p\n",
305 			(void*)cr2, (void*)frame->ip);
306 	} else if ((frame->flags & X86_EFLAGS_ALIGNMENT_CHECK) == 0
307 		&& !IFRAME_IS_USER(frame)
308 		&& (frame->error_code & PGFAULT_P) != 0
309 		&& (x86_read_cr4() & IA32_CR4_SMAP) != 0) {
310 		// check that: 1. AC flag is not set, 2. come not from userland,
311 		// 3. is a page-protection violation, 4. smap is enabled
312 		panic("SMAP violation user-mapped address %p touched from kernel %p\n",
313 			(void*)cr2, (void*)frame->ip);
314 	} else if ((frame->flags & X86_EFLAGS_INTERRUPT) == 0) {
315 		// interrupts disabled
316 
317 		// If a page fault handler is installed, we're allowed to be here.
318 		// TODO: Now we are generally allowing user_memcpy() with interrupts
319 		// disabled, which in most cases is a bug. We should add some thread
320 		// flag allowing to explicitly indicate that this handling is desired.
321 		if (thread != NULL && thread->fault_handler != 0) {
322 			uintptr_t handler
323 				= reinterpret_cast<uintptr_t>(thread->fault_handler);
324 			if (frame->ip != handler) {
325 				frame->ip = handler;
326 				return;
327 			}
328 
329 			// The fault happened at the fault handler address. This is a
330 			// certain infinite loop.
331 			panic("page fault, interrupts disabled, fault handler loop. "
332 				"Touching address %p from ip %p\n", (void*)cr2,
333 				(void*)frame->ip);
334 		}
335 
336 		// If we are not running the kernel startup the page fault was not
337 		// allowed to happen and we must panic.
338 		panic("page fault, but interrupts were disabled. Touching address "
339 			"%p from ip %p\n", (void*)cr2, (void*)frame->ip);
340 		return;
341 	} else if (thread != NULL && thread->page_faults_allowed < 1) {
342 		panic("page fault not allowed at this place. Touching address "
343 			"%p from ip %p\n", (void*)cr2, (void*)frame->ip);
344 		return;
345 	}
346 
347 	enable_interrupts();
348 
349 	vm_page_fault(cr2, frame->ip,
350 		(frame->error_code & PGFAULT_W) != 0,		// write access
351 		(frame->error_code & PGFAULT_I) != 0,		// instruction fetch
352 		IFRAME_IS_USER(frame),						// userland
353 		&newip);
354 	if (newip != 0) {
355 		// the page fault handler wants us to modify the iframe to set the
356 		// IP the cpu will return to this ip
357 		frame->ip = newip;
358 	}
359 }
360 
361 
362 void
363 x86_set_irq_source(int irq, irq_source source)
364 {
365 	sVectorSources[irq] = source;
366 }
367 
368 
369 // #pragma mark -
370 
371 
372 void
373 arch_int_enable_io_interrupt(int irq)
374 {
375 	sCurrentPIC->enable_io_interrupt(irq);
376 }
377 
378 
379 void
380 arch_int_disable_io_interrupt(int irq)
381 {
382 	sCurrentPIC->disable_io_interrupt(irq);
383 }
384 
385 
386 void
387 arch_int_configure_io_interrupt(int irq, uint32 config)
388 {
389 	sCurrentPIC->configure_io_interrupt(irq, config);
390 }
391 
392 
393 #undef arch_int_enable_interrupts
394 #undef arch_int_disable_interrupts
395 #undef arch_int_restore_interrupts
396 #undef arch_int_are_interrupts_enabled
397 
398 
399 void
400 arch_int_enable_interrupts(void)
401 {
402 	arch_int_enable_interrupts_inline();
403 }
404 
405 
406 int
407 arch_int_disable_interrupts(void)
408 {
409 	return arch_int_disable_interrupts_inline();
410 }
411 
412 
413 void
414 arch_int_restore_interrupts(int oldState)
415 {
416 	arch_int_restore_interrupts_inline(oldState);
417 }
418 
419 
420 bool
421 arch_int_are_interrupts_enabled(void)
422 {
423 	return arch_int_are_interrupts_enabled_inline();
424 }
425 
426 
427 int32
428 arch_int_assign_to_cpu(int32 irq, int32 cpu)
429 {
430 	switch (sVectorSources[irq]) {
431 		case IRQ_SOURCE_IOAPIC:
432 			if (sCurrentPIC->assign_interrupt_to_cpu != NULL)
433 				sCurrentPIC->assign_interrupt_to_cpu(irq, cpu);
434 			break;
435 
436 		case IRQ_SOURCE_MSI:
437 			msi_assign_interrupt_to_cpu(irq, cpu);
438 			break;
439 
440 		default:
441 			break;
442 	}
443 	return cpu;
444 }
445 
446 
447 status_t
448 arch_int_init(kernel_args* args)
449 {
450 	// setup the standard programmable interrupt controller
451 	pic_init();
452 	return B_OK;
453 }
454 
455 
456 status_t
457 arch_int_init_post_vm(kernel_args* args)
458 {
459 	// Always init the local apic as it can be used for timers even if we
460 	// don't end up using the io apic
461 	apic_init(args);
462 	return B_OK;
463 }
464 
465 
466 status_t
467 arch_int_init_io(kernel_args* args)
468 {
469 	msi_init(args);
470 	ioapic_preinit(args);
471 	return B_OK;
472 }
473 
474 
475 status_t
476 arch_int_init_post_device_manager(kernel_args* args)
477 {
478 	return B_OK;
479 }
480 
481 
482 void
483 arch_int_set_interrupt_controller(const interrupt_controller& controller)
484 {
485 	sCurrentPIC = &controller;
486 }
487