source: mainline/kernel/arch/amd64/src/debugger.c@ 8ccd2ea

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 8ccd2ea was 43b1e86, checked in by Martin Decky <martin@…>, 17 years ago

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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 <symtab.h>
39#include <print.h>
40#include <panic.h>
41#include <interrupt.h>
42#include <arch/asm.h>
43#include <arch/cpu.h>
44#include <debug.h>
45#include <func.h>
46#include <smp/ipi.h>
47
48typedef struct {
49 uintptr_t address; /**< Breakpoint address */
50 int flags; /**< Flags regarding breakpoint */
51 int counter; /**< How many times the exception occured */
52} bpinfo_t;
53
54static bpinfo_t breakpoints[BKPOINTS_MAX];
55SPINLOCK_INITIALIZE(bkpoint_lock);
56
57static int cmd_print_breakpoints(cmd_arg_t *argv);
58static cmd_info_t bkpts_info = {
59 .name = "bkpts",
60 .description = "Print breakpoint table.",
61 .func = cmd_print_breakpoints,
62 .argc = 0,
63};
64
65#ifndef CONFIG_DEBUG_AS_WATCHPOINT
66
67static int cmd_del_breakpoint(cmd_arg_t *argv);
68static cmd_arg_t del_argv = {
69 .type = ARG_TYPE_INT
70};
71static cmd_info_t delbkpt_info = {
72 .name = "delbkpt",
73 .description = "delbkpt <number> - Delete breakpoint.",
74 .func = cmd_del_breakpoint,
75 .argc = 1,
76 .argv = &del_argv
77};
78
79static int cmd_add_breakpoint(cmd_arg_t *argv);
80static cmd_arg_t add_argv = {
81 .type = ARG_TYPE_INT
82};
83static cmd_info_t addbkpt_info = {
84 .name = "addbkpt",
85 .description = "addbkpt <&symbol> - new breakpoint.",
86 .func = cmd_add_breakpoint,
87 .argc = 1,
88 .argv = &add_argv
89};
90
91static cmd_arg_t addw_argv = {
92 .type = ARG_TYPE_INT
93};
94static cmd_info_t addwatchp_info = {
95 .name = "addwatchp",
96 .description = "addbwatchp <&symbol> - new write watchpoint.",
97 .func = cmd_add_breakpoint,
98 .argc = 1,
99 .argv = &addw_argv
100};
101
102#endif
103
104/** Print table of active breakpoints */
105int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
106{
107 unsigned int i;
108 char *symbol;
109
110 if (sizeof(void *) == 4) {
111 printf("# Count Address In symbol\n");
112 printf("-- ----- ---------- ---------\n");
113 } else {
114 printf("# Count Address In symbol\n");
115 printf("-- ----- ------------------ ---------\n");
116 }
117
118 for (i = 0; i < BKPOINTS_MAX; i++)
119 if (breakpoints[i].address) {
120 symbol = get_symtab_entry(breakpoints[i].address);
121
122 if (sizeof(void *) == 4)
123 printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,
124 breakpoints[i].address, symbol);
125 else
126 printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,
127 breakpoints[i].address, symbol);
128 }
129 return 1;
130}
131
132/* Setup DR register according to table */
133static void setup_dr(int curidx)
134{
135 unative_t dr7;
136 bpinfo_t *cur = &breakpoints[curidx];
137 int flags = breakpoints[curidx].flags;
138
139 /* Disable breakpoint in DR7 */
140 dr7 = read_dr7();
141 dr7 &= ~(0x2 << (curidx*2));
142
143 if (cur->address) { /* Setup DR register */
144 /* Set breakpoint to debug registers */
145 switch (curidx) {
146 case 0:
147 write_dr0(cur->address);
148 break;
149 case 1:
150 write_dr1(cur->address);
151 break;
152 case 2:
153 write_dr2(cur->address);
154 break;
155 case 3:
156 write_dr3(cur->address);
157 break;
158 }
159 /* Set type to requested breakpoint & length*/
160 dr7 &= ~ (0x3 << (16 + 4*curidx));
161 dr7 &= ~ (0x3 << (18 + 4*curidx));
162 if ((flags & BKPOINT_INSTR)) {
163 ;
164 } else {
165 if (sizeof(int) == 4)
166 dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
167 else /* 8 */
168 dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
169
170 if ((flags & BKPOINT_WRITE))
171 dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
172 else if ((flags & BKPOINT_READ_WRITE))
173 dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
174 }
175
176 /* Enable global breakpoint */
177 dr7 |= 0x2 << (curidx*2);
178
179 write_dr7(dr7);
180
181 }
182}
183
184/** Enable hardware breakpoint
185 *
186 * @param where Address of HW breakpoint
187 * @param flags Type of breakpoint (EXECUTE, WRITE)
188 * @return Debug slot on success, -1 - no available HW breakpoint
189 */
190int breakpoint_add(const void *where, const int flags, int curidx)
191{
192 ipl_t ipl;
193 int i;
194 bpinfo_t *cur;
195
196 ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
197
198 ipl = interrupts_disable();
199 spinlock_lock(&bkpoint_lock);
200
201 if (curidx == -1) {
202 /* Find free space in slots */
203 for (i = 0; i < BKPOINTS_MAX; i++)
204 if (!breakpoints[i].address) {
205 curidx = i;
206 break;
207 }
208 if (curidx == -1) {
209 /* Too many breakpoints */
210 spinlock_unlock(&bkpoint_lock);
211 interrupts_restore(ipl);
212 return -1;
213 }
214 }
215 cur = &breakpoints[curidx];
216
217 cur->address = (uintptr_t) where;
218 cur->flags = flags;
219 cur->counter = 0;
220
221 setup_dr(curidx);
222
223 spinlock_unlock(&bkpoint_lock);
224 interrupts_restore(ipl);
225
226 /* Send IPI */
227#ifdef CONFIG_SMP
228// ipi_broadcast(VECTOR_DEBUG_IPI);
229#endif
230
231 return curidx;
232}
233
234#ifdef amd64
235# define getip(x) ((x)->rip)
236#else
237# define getip(x) ((x)->eip)
238#endif
239
240static void handle_exception(int slot, istate_t *istate)
241{
242 ASSERT(breakpoints[slot].address);
243
244 /* Handle zero checker */
245 if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
246 if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
247 if (*((unative_t *) breakpoints[slot].address) != 0)
248 return;
249 printf("**** Found ZERO on address %lx (slot %d) ****\n",
250 breakpoints[slot].address, slot);
251 } else {
252 printf("Data watchpoint - new data: %lx\n",
253 *((unative_t *) breakpoints[slot].address));
254 }
255 }
256 printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
257 get_symtab_entry(getip(istate)));
258 printf("***Type 'exit' to exit kconsole.\n");
259 atomic_set(&haltstate,1);
260 kconsole((void *) "debug");
261 atomic_set(&haltstate,0);
262}
263
264void breakpoint_del(int slot)
265{
266 bpinfo_t *cur;
267 ipl_t ipl;
268
269 ipl = interrupts_disable();
270 spinlock_lock(&bkpoint_lock);
271
272 cur = &breakpoints[slot];
273 if (!cur->address) {
274 spinlock_unlock(&bkpoint_lock);
275 interrupts_restore(ipl);
276 return;
277 }
278
279 cur->address = NULL;
280
281 setup_dr(slot);
282
283 spinlock_unlock(&bkpoint_lock);
284 interrupts_restore(ipl);
285#ifdef CONFIG_SMP
286// ipi_broadcast(VECTOR_DEBUG_IPI);
287#endif
288}
289
290#ifndef CONFIG_DEBUG_AS_WATCHPOINT
291
292/** Remove breakpoint from table */
293int cmd_del_breakpoint(cmd_arg_t *argv)
294{
295 if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
296 printf("Invalid breakpoint number.\n");
297 return 0;
298 }
299 breakpoint_del(argv->intval);
300 return 1;
301}
302
303/** Add new breakpoint to table */
304static int cmd_add_breakpoint(cmd_arg_t *argv)
305{
306 int flags;
307 int id;
308
309 if (argv == &add_argv) {
310 flags = BKPOINT_INSTR;
311 } else { /* addwatchp */
312 flags = BKPOINT_WRITE;
313 }
314 printf("Adding breakpoint on address: %p\n", argv->intval);
315 id = breakpoint_add((void *)argv->intval, flags, -1);
316 if (id < 0)
317 printf("Add breakpoint failed.\n");
318 else
319 printf("Added breakpoint %d.\n", id);
320
321 return 1;
322}
323#endif
324
325static void debug_exception(int n __attribute__((unused)), istate_t *istate)
326{
327 unative_t dr6;
328 int i;
329
330 /* Set RF to restart the instruction */
331#ifdef amd64
332 istate->rflags |= RFLAGS_RF;
333#else
334 istate->eflags |= EFLAGS_RF;
335#endif
336
337 dr6 = read_dr6();
338 for (i=0; i < BKPOINTS_MAX; i++) {
339 if (dr6 & (1 << i)) {
340 dr6 &= ~ (1 << i);
341 write_dr6(dr6);
342
343 handle_exception(i, istate);
344 }
345 }
346}
347
348#ifdef CONFIG_SMP
349static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
350{
351 int i;
352
353 spinlock_lock(&bkpoint_lock);
354 for (i = 0; i < BKPOINTS_MAX; i++)
355 setup_dr(i);
356 spinlock_unlock(&bkpoint_lock);
357}
358#endif
359
360/** Initialize debugger */
361void debugger_init()
362{
363 int i;
364
365 for (i=0; i<BKPOINTS_MAX; i++)
366 breakpoints[i].address = NULL;
367
368 cmd_initialize(&bkpts_info);
369 if (!cmd_register(&bkpts_info))
370 panic("could not register command %s\n", bkpts_info.name);
371
372#ifndef CONFIG_DEBUG_AS_WATCHPOINT
373 cmd_initialize(&delbkpt_info);
374 if (!cmd_register(&delbkpt_info))
375 panic("could not register command %s\n", delbkpt_info.name);
376
377 cmd_initialize(&addbkpt_info);
378 if (!cmd_register(&addbkpt_info))
379 panic("could not register command %s\n", addbkpt_info.name);
380
381 cmd_initialize(&addwatchp_info);
382 if (!cmd_register(&addwatchp_info))
383 panic("could not register command %s\n", addwatchp_info.name);
384#endif
385
386 exc_register(VECTOR_DEBUG, "debugger",
387 debug_exception);
388#ifdef CONFIG_SMP
389 exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
390 debug_ipi);
391#endif
392}
393
394/** @}
395 */
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