source: mainline/kernel/generic/src/interrupt/interrupt.c@ fc81981

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since fc81981 was d0c82c5, checked in by Martin Decky <martin@…>, 15 years ago

perfect CPU cycles accounting, cherry-picked and adopted from lp:~ersin/helenos/measure2
  • Property mode set to 100644
File size: 8.1 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 <ipc/event.h>
48#include <synch/mutex.h>
49#include <time/delay.h>
50#include <macros.h>
51#include <panic.h>
52#include <print.h>
53#include <symtab.h>
54#include <proc/thread.h>
55#include <arch/cycle.h>
56#include <str.h>
57
58exc_table_t exc_table[IVT_ITEMS];
59IRQ_SPINLOCK_INITIALIZE(exctbl_lock);
60
61/** Register exception handler
62 *
63 * @param n Exception number.
64 * @param name Description.
65 * @param hot Whether the exception is actually handled
66 * in any meaningful way.
67 * @param handler New exception handler.
68 *
69 * @return Previously registered exception handler.
70 *
71 */
72iroutine_t exc_register(unsigned int n, const char *name, bool hot,
73 iroutine_t handler)
74{
75#if (IVT_ITEMS > 0)
76 ASSERT(n < IVT_ITEMS);
77#endif
78
79 irq_spinlock_lock(&exctbl_lock, true);
80
81 iroutine_t old = exc_table[n].handler;
82 exc_table[n].handler = handler;
83 exc_table[n].name = name;
84 exc_table[n].hot = hot;
85 exc_table[n].cycles = 0;
86 exc_table[n].count = 0;
87
88 irq_spinlock_unlock(&exctbl_lock, true);
89
90 return old;
91}
92
93/** Dispatch exception according to exception table
94 *
95 * Called directly from the assembler code.
96 * CPU is interrupts_disable()'d.
97 *
98 */
99void exc_dispatch(unsigned int n, istate_t *istate)
100{
101 ASSERT(CPU);
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 has waked up from sleep */
115 irq_spinlock_lock(&CPU->lock, false);
116 if (CPU->idle) {
117 uint64_t now = get_cycle();
118 CPU->idle_cycles += now - CPU->last_cycle;
119 CPU->last_cycle = now;
120 CPU->idle = false;
121 }
122 irq_spinlock_unlock(&CPU->lock, false);
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 exc_table[n].cycles += end_cycle - begin_cycle;
146 exc_table[n].count++;
147
148 /* Do not charge THREAD for exception cycles */
149 if (THREAD) {
150 irq_spinlock_lock(&THREAD->lock, false);
151 THREAD->last_cycle = end_cycle;
152 irq_spinlock_unlock(&THREAD->lock, false);
153 }
154}
155
156/** Default 'null' exception handler
157 *
158 */
159static void exc_undef(unsigned int n, istate_t *istate)
160{
161 fault_if_from_uspace(istate, "Unhandled exception %u.", n);
162 panic("Unhandled exception %u.", n);
163}
164
165/** Terminate thread and task if exception came from userspace.
166 *
167 */
168void fault_if_from_uspace(istate_t *istate, const char *fmt, ...)
169{
170 if (!istate_from_uspace(istate))
171 return;
172
173 printf("Task %s (%" PRIu64 ") killed due to an exception at "
174 "program counter %p.\n", TASK->name, TASK->taskid,
175 istate_get_pc(istate));
176
177 stack_trace_istate(istate);
178
179 printf("Kill message: ");
180
181 va_list args;
182 va_start(args, fmt);
183 vprintf(fmt, args);
184 va_end(args);
185 printf("\n");
186
187 /*
188 * Userspace can subscribe for FAULT events to take action
189 * whenever a thread faults. (E.g. take a dump, run a debugger).
190 * The notification is always available, but unless Udebug is enabled,
191 * that's all you get.
192 */
193 if (event_is_subscribed(EVENT_FAULT)) {
194 /* Notify the subscriber that a fault occurred. */
195 event_notify_3(EVENT_FAULT, LOWER32(TASK->taskid),
196 UPPER32(TASK->taskid), (unative_t) THREAD);
197
198#ifdef CONFIG_UDEBUG
199 /* Wait for a debugging session. */
200 udebug_thread_fault();
201#endif
202 }
203
204 task_kill(TASK->taskid);
205 thread_exit();
206}
207
208#ifdef CONFIG_KCONSOLE
209
210static char flag_buf[MAX_CMDLINE + 1];
211
212/** Print all exceptions
213 *
214 */
215static int cmd_exc_print(cmd_arg_t *argv)
216{
217 bool excs_all;
218
219 if (str_cmp(flag_buf, "-a") == 0)
220 excs_all = true;
221 else if (str_cmp(flag_buf, "") == 0)
222 excs_all = false;
223 else {
224 printf("Unknown argument \"%s\".\n", flag_buf);
225 return 1;
226 }
227
228#if (IVT_ITEMS > 0)
229 unsigned int i;
230 unsigned int rows;
231
232 irq_spinlock_lock(&exctbl_lock, true);
233
234#ifdef __32_BITS__
235 printf("[exc ] [description ] [count ] [cycles ]"
236 " [handler ] [symbol\n");
237 rows = 1;
238#endif
239
240#ifdef __64_BITS__
241 printf("[exc ] [description ] [count ] [cycles ]"
242 " [handler ]\n");
243 printf(" [symbol\n");
244 rows = 2;
245#endif
246
247 for (i = 0; i < IVT_ITEMS; i++) {
248 if ((!excs_all) && (!exc_table[i].hot))
249 continue;
250
251 uint64_t count;
252 char count_suffix;
253
254 order_suffix(exc_table[i].count, &count, &count_suffix);
255
256 uint64_t cycles;
257 char cycles_suffix;
258
259 order_suffix(exc_table[i].cycles, &cycles, &cycles_suffix);
260
261 const char *symbol =
262 symtab_fmt_name_lookup((unative_t) exc_table[i].handler);
263
264#ifdef __32_BITS__
265 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %10p %s\n",
266 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
267 cycles, cycles_suffix, exc_table[i].handler, symbol);
268
269 PAGING(rows, 1, irq_spinlock_unlock(&exctbl_lock, true),
270 irq_spinlock_lock(&exctbl_lock, true));
271#endif
272
273#ifdef __64_BITS__
274 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %18p\n",
275 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
276 cycles, cycles_suffix, exc_table[i].handler);
277 printf(" %s\n", symbol);
278
279 PAGING(rows, 2, irq_spinlock_unlock(&exctbl_lock, true),
280 irq_spinlock_lock(&exctbl_lock, true));
281#endif
282 }
283
284 irq_spinlock_unlock(&exctbl_lock, true);
285#else /* (IVT_ITEMS > 0) */
286
287 printf("No exception table%s.\n", excs_all ? " (showing all exceptions)" : "");
288
289#endif /* (IVT_ITEMS > 0) */
290
291 return 1;
292}
293
294static cmd_arg_t exc_argv = {
295 .type = ARG_TYPE_STRING_OPTIONAL,
296 .buffer = flag_buf,
297 .len = sizeof(flag_buf)
298};
299
300static cmd_info_t exc_info = {
301 .name = "exc",
302 .description = "Print exception table (use -a for all exceptions).",
303 .func = cmd_exc_print,
304 .help = NULL,
305 .argc = 1,
306 .argv = &exc_argv
307};
308
309#endif /* CONFIG_KCONSOLE */
310
311/** Initialize generic exception handling support
312 *
313 */
314void exc_init(void)
315{
316 (void) exc_undef;
317
318#if (IVT_ITEMS > 0)
319 unsigned int i;
320
321 for (i = 0; i < IVT_ITEMS; i++)
322 exc_register(i, "undef", false, (iroutine_t) exc_undef);
323#endif
324
325#ifdef CONFIG_KCONSOLE
326 cmd_initialize(&exc_info);
327 if (!cmd_register(&exc_info))
328 printf("Cannot register command %s\n", exc_info.name);
329#endif
330}
331
332/** @}
333 */
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