source: mainline/kernel/generic/src/interrupt/interrupt.c@ 26aafe8

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 26aafe8 was 26aafe8, checked in by Martin Decky <martin@…>, 14 years ago

cleanup the huge mess related to stacks, their sizes and locations
use two frames for kernel stacks by default on all platforms (to play it safe)
  • Property mode set to 100644
File size: 8.3 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 <symtab.h>
53#include <proc/thread.h>
54#include <arch/cycle.h>
55#include <str.h>
56#include <trace.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 */
99NO_TRACE void exc_dispatch(unsigned int n, istate_t *istate)
100{
101#if (IVT_ITEMS > 0)
102 ASSERT(n < IVT_ITEMS);
103#endif
104
105 /* Account user cycles */
106 if (THREAD) {
107 irq_spinlock_lock(&THREAD->lock, false);
108 thread_update_accounting(true);
109 irq_spinlock_unlock(&THREAD->lock, false);
110 }
111
112 /* Account CPU usage if it has waked up from sleep */
113 if (CPU) {
114 irq_spinlock_lock(&CPU->lock, false);
115 if (CPU->idle) {
116 uint64_t now = get_cycle();
117 CPU->idle_cycles += now - CPU->last_cycle;
118 CPU->last_cycle = now;
119 CPU->idle = false;
120 }
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
167/** Terminate thread and task if exception came from userspace.
168 *
169 */
170NO_TRACE void fault_if_from_uspace(istate_t *istate, const char *fmt, ...)
171{
172 if (!istate_from_uspace(istate))
173 return;
174
175 printf("Task %s (%" PRIu64 ") killed due to an exception at "
176 "program counter %p.\n", TASK->name, TASK->taskid,
177 (void *) istate_get_pc(istate));
178
179 stack_trace_istate(istate);
180
181 printf("Kill message: ");
182
183 va_list args;
184 va_start(args, fmt);
185 vprintf(fmt, args);
186 va_end(args);
187 printf("\n");
188
189 task_kill_self(true);
190}
191
192/** Get istate structure of a thread.
193 *
194 * Get pointer to the istate structure at the bottom of the kernel stack.
195 *
196 * This function can be called in interrupt or user context. In interrupt
197 * context the istate structure is created by the low-level exception
198 * handler. In user context the istate structure is created by the
199 * low-level syscall handler.
200 */
201istate_t *istate_get(thread_t *thread)
202{
203 /*
204 * The istate structure should be right at the bottom of the kernel
205 * stack.
206 */
207 return (istate_t *) ((uint8_t *)
208 thread->kstack + STACK_SIZE - sizeof(istate_t));
209}
210
211#ifdef CONFIG_KCONSOLE
212
213static char flag_buf[MAX_CMDLINE + 1];
214
215/** Print all exceptions
216 *
217 */
218NO_TRACE static int cmd_exc_print(cmd_arg_t *argv)
219{
220 bool excs_all;
221
222 if (str_cmp(flag_buf, "-a") == 0)
223 excs_all = true;
224 else if (str_cmp(flag_buf, "") == 0)
225 excs_all = false;
226 else {
227 printf("Unknown argument \"%s\".\n", flag_buf);
228 return 1;
229 }
230
231#if (IVT_ITEMS > 0)
232 unsigned int i;
233 unsigned int rows;
234
235 irq_spinlock_lock(&exctbl_lock, true);
236
237#ifdef __32_BITS__
238 printf("[exc ] [description ] [count ] [cycles ]"
239 " [handler ] [symbol\n");
240 rows = 1;
241#endif
242
243#ifdef __64_BITS__
244 printf("[exc ] [description ] [count ] [cycles ]"
245 " [handler ]\n");
246 printf(" [symbol\n");
247 rows = 2;
248#endif
249
250 for (i = 0; i < IVT_ITEMS; i++) {
251 if ((!excs_all) && (!exc_table[i].hot))
252 continue;
253
254 uint64_t count;
255 char count_suffix;
256
257 order_suffix(exc_table[i].count, &count, &count_suffix);
258
259 uint64_t cycles;
260 char cycles_suffix;
261
262 order_suffix(exc_table[i].cycles, &cycles, &cycles_suffix);
263
264 const char *symbol =
265 symtab_fmt_name_lookup((sysarg_t) exc_table[i].handler);
266
267#ifdef __32_BITS__
268 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %10p %s\n",
269 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
270 cycles, cycles_suffix, exc_table[i].handler, symbol);
271
272 PAGING(rows, 1, irq_spinlock_unlock(&exctbl_lock, true),
273 irq_spinlock_lock(&exctbl_lock, true));
274#endif
275
276#ifdef __64_BITS__
277 printf("%-8u %-20s %9" PRIu64 "%c %9" PRIu64 "%c %18p\n",
278 i + IVT_FIRST, exc_table[i].name, count, count_suffix,
279 cycles, cycles_suffix, exc_table[i].handler);
280 printf(" %s\n", symbol);
281
282 PAGING(rows, 2, irq_spinlock_unlock(&exctbl_lock, true),
283 irq_spinlock_lock(&exctbl_lock, true));
284#endif
285 }
286
287 irq_spinlock_unlock(&exctbl_lock, true);
288#else /* (IVT_ITEMS > 0) */
289
290 printf("No exception table%s.\n", excs_all ? " (showing all exceptions)" : "");
291
292#endif /* (IVT_ITEMS > 0) */
293
294 return 1;
295}
296
297static cmd_arg_t exc_argv = {
298 .type = ARG_TYPE_STRING_OPTIONAL,
299 .buffer = flag_buf,
300 .len = sizeof(flag_buf)
301};
302
303static cmd_info_t exc_info = {
304 .name = "exc",
305 .description = "Print exception table (use -a for all exceptions).",
306 .func = cmd_exc_print,
307 .help = NULL,
308 .argc = 1,
309 .argv = &exc_argv
310};
311
312#endif /* CONFIG_KCONSOLE */
313
314/** Initialize generic exception handling support
315 *
316 */
317void exc_init(void)
318{
319 (void) exc_undef;
320
321#if (IVT_ITEMS > 0)
322 unsigned int i;
323
324 for (i = 0; i < IVT_ITEMS; i++)
325 exc_register(i, "undef", false, (iroutine_t) exc_undef);
326#endif
327
328#ifdef CONFIG_KCONSOLE
329 cmd_initialize(&exc_info);
330 if (!cmd_register(&exc_info))
331 printf("Cannot register command %s\n", exc_info.name);
332#endif
333}
334
335/** @}
336 */
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