source: mainline/kernel/generic/src/interrupt/interrupt.c@ 6adb775f

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 6adb775f was b1c57a8, checked in by Jakub Jermar <jakub@…>, 11 years ago

Merge from lp:~adam-hraska+lp/helenos/rcu/.

Only merge from the feature branch and resolve all conflicts.
  • Property mode set to 100644
File size: 8.7 KB
Line 
1/*
2 * Copyright (c) 2005 Ondrej Palkovsky
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup genericinterrupt
30 * @{
31 */
32/**
33 * @file
34 * @brief Interrupt redirector.
35 *
36 * This file provides means of registering interrupt handlers
37 * by kernel functions and calling the handlers when interrupts
38 * occur.
39 *
40 */
41
42#include <interrupt.h>
43#include <debug.h>
44#include <console/kconsole.h>
45#include <console/console.h>
46#include <console/cmd.h>
47#include <synch/mutex.h>
48#include <time/delay.h>
49#include <macros.h>
50#include <panic.h>
51#include <print.h>
52#include <stdarg.h>
53#include <symtab.h>
54#include <proc/thread.h>
55#include <arch/cycle.h>
56#include <arch/stack.h>
57#include <str.h>
58#include <trace.h>
59
60exc_table_t exc_table[IVT_ITEMS];
61IRQ_SPINLOCK_INITIALIZE(exctbl_lock);
62
63/** Register exception handler
64 *
65 * @param n Exception number.
66 * @param name Description.
67 * @param hot Whether the exception is actually handled
68 * in any meaningful way.
69 * @param handler New exception handler.
70 *
71 * @return Previously registered exception handler.
72 *
73 */
74iroutine_t exc_register(unsigned int n, const char *name, bool hot,
75 iroutine_t handler)
76{
77#if (IVT_ITEMS > 0)
78 ASSERT(n < IVT_ITEMS);
79#endif
80
81 irq_spinlock_lock(&exctbl_lock, true);
82
83 iroutine_t old = exc_table[n].handler;
84 exc_table[n].handler = handler;
85 exc_table[n].name = name;
86 exc_table[n].hot = hot;
87 exc_table[n].cycles = 0;
88 exc_table[n].count = 0;
89
90 irq_spinlock_unlock(&exctbl_lock, true);
91
92 return old;
93}
94
95/** Dispatch exception according to exception table
96 *
97 * Called directly from the assembler code.
98 * CPU is interrupts_disable()'d.
99 *
100 */
101NO_TRACE void exc_dispatch(unsigned int n, istate_t *istate)
102{
103#if (IVT_ITEMS > 0)
104 ASSERT(n < IVT_ITEMS);
105#endif
106
107 /* Account user cycles */
108 if (THREAD) {
109 irq_spinlock_lock(&THREAD->lock, false);
110 thread_update_accounting(true);
111 irq_spinlock_unlock(&THREAD->lock, false);
112 }
113
114 /* Account CPU usage if it woke up from sleep */
115 if (CPU && CPU->idle) {
116 irq_spinlock_lock(&CPU->lock, false);
117 uint64_t now = get_cycle();
118 CPU->idle_cycles += now - CPU->last_cycle;
119 CPU->last_cycle = now;
120 CPU->idle = false;
121 irq_spinlock_unlock(&CPU->lock, false);
122 }
123
124 uint64_t begin_cycle = get_cycle();
125
126#ifdef CONFIG_UDEBUG
127 if (THREAD)
128 THREAD->udebug.uspace_state = istate;
129#endif
130
131 exc_table[n].handler(n + IVT_FIRST, istate);
132
133#ifdef CONFIG_UDEBUG
134 if (THREAD)
135 THREAD->udebug.uspace_state = NULL;
136#endif
137
138 /* This is a safe place to exit exiting thread */
139 if ((THREAD) && (THREAD->interrupted) && (istate_from_uspace(istate)))
140 thread_exit();
141
142 /* Account exception handling */
143 uint64_t end_cycle = get_cycle();
144
145 irq_spinlock_lock(&exctbl_lock, false);
146 exc_table[n].cycles += end_cycle - begin_cycle;
147 exc_table[n].count++;
148 irq_spinlock_unlock(&exctbl_lock, false);
149
150 /* Do not charge THREAD for exception cycles */
151 if (THREAD) {
152 irq_spinlock_lock(&THREAD->lock, false);
153 THREAD->last_cycle = end_cycle;
154 irq_spinlock_unlock(&THREAD->lock, false);
155 }
156}
157
158/** Default 'null' exception handler
159 *
160 */
161NO_TRACE static void exc_undef(unsigned int n, istate_t *istate)
162{
163 fault_if_from_uspace(istate, "Unhandled exception %u.", n);
164 panic_badtrap(istate, n, "Unhandled exception %u.", n);
165}
166
167static NO_TRACE
168void fault_from_uspace_core(istate_t *istate, const char *fmt, va_list args)
169{
170 printf("Task %s (%" PRIu64 ") killed due to an exception at "
171 "program counter %p.\n", TASK->name, TASK->taskid,
172 (void *) istate_get_pc(istate));
173
174 istate_decode(istate);
175 stack_trace_istate(istate);
176
177 printf("Kill message: ");
178 vprintf(fmt, args);
179 printf("\n");
180
181 task_kill_self(true);
182}
183
184/** Terminate thread and task after the exception came from userspace.
185 *
186 */
187NO_TRACE void fault_from_uspace(istate_t *istate, const char *fmt, ...)
188{
189 va_list args;
190
191 va_start(args, fmt);
192 fault_from_uspace_core(istate, fmt, args);
193 va_end(args);
194}
195
196/** Terminate thread and task if exception came from userspace.
197 *
198 */
199NO_TRACE void fault_if_from_uspace(istate_t *istate, const char *fmt, ...)
200{
201 if (!istate_from_uspace(istate))
202 return;
203
204 va_list args;
205 va_start(args, fmt);
206 fault_from_uspace_core(istate, fmt, args);
207 va_end(args);
208}
209
210/** Get istate structure of a thread.
211 *
212 * Get pointer to the istate structure at the bottom of the kernel stack.
213 *
214 * This function can be called in interrupt or user context. In interrupt
215 * context the istate structure is created by the low-level exception
216 * handler. In user context the istate structure is created by the
217 * low-level syscall handler.
218 */
219istate_t *istate_get(thread_t *thread)
220{
221 /*
222 * The istate structure should be right at the bottom of the kernel
223 * memory stack.
224 */
225 return (istate_t *) &thread->kstack[MEM_STACK_SIZE - sizeof(istate_t)];
226}
227
228#ifdef CONFIG_KCONSOLE
229
230static char flag_buf[MAX_CMDLINE + 1];
231
232/** Print all exceptions
233 *
234 */
235NO_TRACE static int cmd_exc_print(cmd_arg_t *argv)
236{
237 bool excs_all;
238
239 if (str_cmp(flag_buf, "-a") == 0)
240 excs_all = true;
241 else if (str_cmp(flag_buf, "") == 0)
242 excs_all = false;
243 else {
244 printf("Unknown argument \"%s\".\n", flag_buf);
245 return 1;
246 }
247
248#if (IVT_ITEMS > 0)
249 unsigned int i;
250 unsigned int rows;
251
252 irq_spinlock_lock(&exctbl_lock, true);
253
254#ifdef __32_BITS__
255 printf("[exc ] [description ] [count ] [cycles ]"
256 " [handler ] [symbol\n");
257 rows = 1;
258#endif
259
260#ifdef __64_BITS__
261 printf("[exc ] [description ] [count ] [cycles ]"
262 " [handler ]\n");
263 printf(" [symbol\n");
264 rows = 2;
265#endif
266
267 for (i = 0; i < IVT_ITEMS; i++) {
268 if ((!excs_all) && (!exc_table[i].hot))
269 continue;
270
271 uint64_t count;
272 char count_suffix;
273
274 order_suffix(exc_table[i].count, &count, &count_suffix);
275
276 uint64_t cycles;
277 char cycles_suffix;
278
279 order_suffix(exc_table[i].cycles, &cycles, &cycles_suffix);
280
281 const char *symbol =
282 symtab_fmt_name_lookup((sysarg_t) exc_table[i].handler);
283
284#ifdef __32_BITS__
285 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %10p %s\n",
286 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
287 cycles, cycles_suffix, exc_table[i].handler, symbol);
288
289 PAGING(rows, 1, irq_spinlock_unlock(&exctbl_lock, true),
290 irq_spinlock_lock(&exctbl_lock, true));
291#endif
292
293#ifdef __64_BITS__
294 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %18p\n",
295 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
296 cycles, cycles_suffix, exc_table[i].handler);
297 printf(" %s\n", symbol);
298
299 PAGING(rows, 2, irq_spinlock_unlock(&exctbl_lock, true),
300 irq_spinlock_lock(&exctbl_lock, true));
301#endif
302 }
303
304 irq_spinlock_unlock(&exctbl_lock, true);
305#else /* (IVT_ITEMS > 0) */
306
307 printf("No exception table%s.\n", excs_all ? " (showing all exceptions)" : "");
308
309#endif /* (IVT_ITEMS > 0) */
310
311 return 1;
312}
313
314static cmd_arg_t exc_argv = {
315 .type = ARG_TYPE_STRING_OPTIONAL,
316 .buffer = flag_buf,
317 .len = sizeof(flag_buf)
318};
319
320static cmd_info_t exc_info = {
321 .name = "exc",
322 .description = "Print exception table (use -a for all exceptions).",
323 .func = cmd_exc_print,
324 .help = NULL,
325 .argc = 1,
326 .argv = &exc_argv
327};
328
329#endif /* CONFIG_KCONSOLE */
330
331/** Initialize generic exception handling support
332 *
333 */
334void exc_init(void)
335{
336 (void) exc_undef;
337
338#if (IVT_ITEMS > 0)
339 unsigned int i;
340
341 for (i = 0; i < IVT_ITEMS; i++)
342 exc_register(i, "undef", false, (iroutine_t) exc_undef);
343#endif
344
345#ifdef CONFIG_KCONSOLE
346 cmd_initialize(&exc_info);
347 if (!cmd_register(&exc_info))
348 printf("Cannot register command %s\n", exc_info.name);
349#endif
350}
351
352/** @}
353 */
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