source: mainline/kernel/arch/amd64/src/debugger.c@ 656b789

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 656b789 was e2b762ec, checked in by Jiri Svoboda <jirik.svoboda@…>, 17 years ago

Make kernel symbol information optional.
  • Property mode set to 100644
File size: 9.6 KB
Line 
1/*
2 * Copyright (c) 2006 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 amd64debug
30 * @{
31 */
32/** @file
33 */
34
35#include <arch/debugger.h>
36#include <console/kconsole.h>
37#include <console/cmd.h>
38#include <print.h>
39#include <panic.h>
40#include <interrupt.h>
41#include <arch/asm.h>
42#include <arch/cpu.h>
43#include <debug.h>
44#include <func.h>
45#include <smp/ipi.h>
46
47#ifdef CONFIG_SYMTAB
48#include <symtab.h>
49#endif
50
51typedef struct {
52 uintptr_t address; /**< Breakpoint address */
53 int flags; /**< Flags regarding breakpoint */
54 int counter; /**< How many times the exception occured */
55} bpinfo_t;
56
57static bpinfo_t breakpoints[BKPOINTS_MAX];
58SPINLOCK_INITIALIZE(bkpoint_lock);
59
60#ifdef CONFIG_KCONSOLE
61
62static int cmd_print_breakpoints(cmd_arg_t *argv);
63static cmd_info_t bkpts_info = {
64 .name = "bkpts",
65 .description = "Print breakpoint table.",
66 .func = cmd_print_breakpoints,
67 .argc = 0,
68};
69
70static int cmd_del_breakpoint(cmd_arg_t *argv);
71static cmd_arg_t del_argv = {
72 .type = ARG_TYPE_INT
73};
74static cmd_info_t delbkpt_info = {
75 .name = "delbkpt",
76 .description = "delbkpt <number> - Delete breakpoint.",
77 .func = cmd_del_breakpoint,
78 .argc = 1,
79 .argv = &del_argv
80};
81
82static int cmd_add_breakpoint(cmd_arg_t *argv);
83static cmd_arg_t add_argv = {
84 .type = ARG_TYPE_INT
85};
86static cmd_info_t addbkpt_info = {
87 .name = "addbkpt",
88 .description = "addbkpt <&symbol> - new breakpoint.",
89 .func = cmd_add_breakpoint,
90 .argc = 1,
91 .argv = &add_argv
92};
93
94static cmd_arg_t addw_argv = {
95 .type = ARG_TYPE_INT
96};
97static cmd_info_t addwatchp_info = {
98 .name = "addwatchp",
99 .description = "addbwatchp <&symbol> - new write watchpoint.",
100 .func = cmd_add_breakpoint,
101 .argc = 1,
102 .argv = &addw_argv
103};
104
105#endif /* CONFIG_KCONSOLE */
106
107/* Setup DR register according to table */
108static void setup_dr(int curidx)
109{
110 unative_t dr7;
111 bpinfo_t *cur = &breakpoints[curidx];
112 int flags = breakpoints[curidx].flags;
113
114 /* Disable breakpoint in DR7 */
115 dr7 = read_dr7();
116 dr7 &= ~(0x2 << (curidx*2));
117
118 if (cur->address) { /* Setup DR register */
119 /* Set breakpoint to debug registers */
120 switch (curidx) {
121 case 0:
122 write_dr0(cur->address);
123 break;
124 case 1:
125 write_dr1(cur->address);
126 break;
127 case 2:
128 write_dr2(cur->address);
129 break;
130 case 3:
131 write_dr3(cur->address);
132 break;
133 }
134 /* Set type to requested breakpoint & length*/
135 dr7 &= ~ (0x3 << (16 + 4*curidx));
136 dr7 &= ~ (0x3 << (18 + 4*curidx));
137 if ((flags & BKPOINT_INSTR)) {
138 ;
139 } else {
140
141#ifdef __32_BITS__
142 dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
143#endif
144
145#ifdef __64_BITS__
146 dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
147#endif
148
149 if ((flags & BKPOINT_WRITE))
150 dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
151 else if ((flags & BKPOINT_READ_WRITE))
152 dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
153 }
154
155 /* Enable global breakpoint */
156 dr7 |= 0x2 << (curidx * 2);
157
158 write_dr7(dr7);
159
160 }
161}
162
163/** Enable hardware breakpoint
164 *
165 * @param where Address of HW breakpoint
166 * @param flags Type of breakpoint (EXECUTE, WRITE)
167 * @return Debug slot on success, -1 - no available HW breakpoint
168 */
169int breakpoint_add(const void *where, const int flags, int curidx)
170{
171 ipl_t ipl;
172 int i;
173 bpinfo_t *cur;
174
175 ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
176
177 ipl = interrupts_disable();
178 spinlock_lock(&bkpoint_lock);
179
180 if (curidx == -1) {
181 /* Find free space in slots */
182 for (i = 0; i < BKPOINTS_MAX; i++)
183 if (!breakpoints[i].address) {
184 curidx = i;
185 break;
186 }
187 if (curidx == -1) {
188 /* Too many breakpoints */
189 spinlock_unlock(&bkpoint_lock);
190 interrupts_restore(ipl);
191 return -1;
192 }
193 }
194 cur = &breakpoints[curidx];
195
196 cur->address = (uintptr_t) where;
197 cur->flags = flags;
198 cur->counter = 0;
199
200 setup_dr(curidx);
201
202 spinlock_unlock(&bkpoint_lock);
203 interrupts_restore(ipl);
204
205 /* Send IPI */
206#ifdef CONFIG_SMP
207// ipi_broadcast(VECTOR_DEBUG_IPI);
208#endif
209
210 return curidx;
211}
212
213#ifdef __64_BITS__
214 #define getip(x) ((x)->rip)
215#else
216 #define getip(x) ((x)->eip)
217#endif
218
219static void handle_exception(int slot, istate_t *istate)
220{
221 ASSERT(breakpoints[slot].address);
222
223 /* Handle zero checker */
224 if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
225 if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
226 if (*((unative_t *) breakpoints[slot].address) != 0)
227 return;
228 printf("*** Found ZERO on address %lx (slot %d) ***\n",
229 breakpoints[slot].address, slot);
230 } else {
231 printf("Data watchpoint - new data: %lx\n",
232 *((unative_t *) breakpoints[slot].address));
233 }
234 }
235
236#ifdef CONFIG_SYMTAB
237 printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
238 get_symtab_entry(getip(istate)));
239#else
240 printf("Reached breakpoint %d:%lx\n", slot, getip(istate));
241#endif
242
243#ifdef CONFIG_KCONSOLE
244 atomic_set(&haltstate, 1);
245 kconsole("debug", "Debug console ready.\n", false);
246 atomic_set(&haltstate, 0);
247#endif
248}
249
250void breakpoint_del(int slot)
251{
252 bpinfo_t *cur;
253 ipl_t ipl;
254
255 ipl = interrupts_disable();
256 spinlock_lock(&bkpoint_lock);
257
258 cur = &breakpoints[slot];
259 if (!cur->address) {
260 spinlock_unlock(&bkpoint_lock);
261 interrupts_restore(ipl);
262 return;
263 }
264
265 cur->address = NULL;
266
267 setup_dr(slot);
268
269 spinlock_unlock(&bkpoint_lock);
270 interrupts_restore(ipl);
271#ifdef CONFIG_SMP
272// ipi_broadcast(VECTOR_DEBUG_IPI);
273#endif
274}
275
276
277
278static void debug_exception(int n __attribute__((unused)), istate_t *istate)
279{
280 unative_t dr6;
281 int i;
282
283 /* Set RF to restart the instruction */
284#ifdef __64_BITS__
285 istate->rflags |= RFLAGS_RF;
286#else
287 istate->eflags |= EFLAGS_RF;
288#endif
289
290 dr6 = read_dr6();
291 for (i=0; i < BKPOINTS_MAX; i++) {
292 if (dr6 & (1 << i)) {
293 dr6 &= ~ (1 << i);
294 write_dr6(dr6);
295
296 handle_exception(i, istate);
297 }
298 }
299}
300
301#ifdef CONFIG_SMP
302static void
303debug_ipi(int n __attribute__((unused)),
304 istate_t *istate __attribute__((unused)))
305{
306 int i;
307
308 spinlock_lock(&bkpoint_lock);
309 for (i = 0; i < BKPOINTS_MAX; i++)
310 setup_dr(i);
311 spinlock_unlock(&bkpoint_lock);
312}
313#endif
314
315/** Initialize debugger */
316void debugger_init()
317{
318 int i;
319
320 for (i = 0; i < BKPOINTS_MAX; i++)
321 breakpoints[i].address = NULL;
322
323#ifdef CONFIG_KCONSOLE
324 cmd_initialize(&bkpts_info);
325 if (!cmd_register(&bkpts_info))
326 printf("Cannot register command %s\n", bkpts_info.name);
327
328 cmd_initialize(&delbkpt_info);
329 if (!cmd_register(&delbkpt_info))
330 printf("Cannot register command %s\n", delbkpt_info.name);
331
332 cmd_initialize(&addbkpt_info);
333 if (!cmd_register(&addbkpt_info))
334 printf("Cannot register command %s\n", addbkpt_info.name);
335
336 cmd_initialize(&addwatchp_info);
337 if (!cmd_register(&addwatchp_info))
338 printf("Cannot register command %s\n", addwatchp_info.name);
339#endif /* CONFIG_KCONSOLE */
340
341 exc_register(VECTOR_DEBUG, "debugger", debug_exception);
342#ifdef CONFIG_SMP
343 exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
344#endif
345}
346
347#ifdef CONFIG_KCONSOLE
348/** Print table of active breakpoints */
349int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
350{
351 unsigned int i;
352 char *symbol;
353
354#ifdef __32_BITS__
355 printf("# Count Address In symbol\n");
356 printf("-- ----- ---------- ---------\n");
357#endif
358
359#ifdef __64_BITS__
360 printf("# Count Address In symbol\n");
361 printf("-- ----- ------------------ ---------\n");
362#endif
363
364 for (i = 0; i < BKPOINTS_MAX; i++)
365 if (breakpoints[i].address) {
366#ifdef CONFIG_SYMTAB
367 symbol = get_symtab_entry(breakpoints[i].address);
368#else
369 symbol = "n/a";
370#endif
371
372#ifdef __32_BITS__
373 printf("%-2u %-5d %#10zx %s\n", i,
374 breakpoints[i].counter, breakpoints[i].address,
375 symbol);
376#endif
377
378#ifdef __64_BITS__
379 printf("%-2u %-5d %#18zx %s\n", i,
380 breakpoints[i].counter, breakpoints[i].address,
381 symbol);
382#endif
383
384 }
385 return 1;
386}
387
388/** Remove breakpoint from table */
389int cmd_del_breakpoint(cmd_arg_t *argv)
390{
391 unative_t bpno = argv->intval;
392 if (bpno > BKPOINTS_MAX) {
393 printf("Invalid breakpoint number.\n");
394 return 0;
395 }
396 breakpoint_del(argv->intval);
397 return 1;
398}
399
400/** Add new breakpoint to table */
401static int cmd_add_breakpoint(cmd_arg_t *argv)
402{
403 int flags;
404 int id;
405
406 if (argv == &add_argv) {
407 flags = BKPOINT_INSTR;
408 } else { /* addwatchp */
409 flags = BKPOINT_WRITE;
410 }
411 printf("Adding breakpoint on address: %p\n", argv->intval);
412 id = breakpoint_add((void *)argv->intval, flags, -1);
413 if (id < 0)
414 printf("Add breakpoint failed.\n");
415 else
416 printf("Added breakpoint %d.\n", id);
417
418 return 1;
419}
420#endif /* CONFIG_KCONSOLE */
421
422/** @}
423 */
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