source: mainline/kernel/arch/amd64/src/debugger.c@ e25eca80

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since e25eca80 was f4c2b6a, checked in by Martin Decky <martin@…>, 17 years ago

reflect changes in generic code
proper formatting directives
coding style
  • Property mode set to 100644
File size: 9.4 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 <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#ifdef __32_BITS__
111 printf("# Count Address In symbol\n");
112 printf("-- ----- ---------- ---------\n");
113#endif
114
115#ifdef __64_BITS__
116 printf("# Count Address In symbol\n");
117 printf("-- ----- ------------------ ---------\n");
118#endif
119
120 for (i = 0; i < BKPOINTS_MAX; i++)
121 if (breakpoints[i].address) {
122 symbol = get_symtab_entry(breakpoints[i].address);
123
124#ifdef __32_BITS__
125 printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,
126 breakpoints[i].address, symbol);
127#endif
128
129#ifdef __64_BITS__
130 printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,
131 breakpoints[i].address, symbol);
132#endif
133
134 }
135 return 1;
136}
137
138/* Setup DR register according to table */
139static void setup_dr(int curidx)
140{
141 unative_t dr7;
142 bpinfo_t *cur = &breakpoints[curidx];
143 int flags = breakpoints[curidx].flags;
144
145 /* Disable breakpoint in DR7 */
146 dr7 = read_dr7();
147 dr7 &= ~(0x2 << (curidx*2));
148
149 if (cur->address) { /* Setup DR register */
150 /* Set breakpoint to debug registers */
151 switch (curidx) {
152 case 0:
153 write_dr0(cur->address);
154 break;
155 case 1:
156 write_dr1(cur->address);
157 break;
158 case 2:
159 write_dr2(cur->address);
160 break;
161 case 3:
162 write_dr3(cur->address);
163 break;
164 }
165 /* Set type to requested breakpoint & length*/
166 dr7 &= ~ (0x3 << (16 + 4*curidx));
167 dr7 &= ~ (0x3 << (18 + 4*curidx));
168 if ((flags & BKPOINT_INSTR)) {
169 ;
170 } else {
171
172#ifdef __32_BITS__
173 dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
174#endif
175
176#ifdef __64_BITS__
177 dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
178#endif
179
180 if ((flags & BKPOINT_WRITE))
181 dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
182 else if ((flags & BKPOINT_READ_WRITE))
183 dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
184 }
185
186 /* Enable global breakpoint */
187 dr7 |= 0x2 << (curidx*2);
188
189 write_dr7(dr7);
190
191 }
192}
193
194/** Enable hardware breakpoint
195 *
196 * @param where Address of HW breakpoint
197 * @param flags Type of breakpoint (EXECUTE, WRITE)
198 * @return Debug slot on success, -1 - no available HW breakpoint
199 */
200int breakpoint_add(const void *where, const int flags, int curidx)
201{
202 ipl_t ipl;
203 int i;
204 bpinfo_t *cur;
205
206 ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
207
208 ipl = interrupts_disable();
209 spinlock_lock(&bkpoint_lock);
210
211 if (curidx == -1) {
212 /* Find free space in slots */
213 for (i = 0; i < BKPOINTS_MAX; i++)
214 if (!breakpoints[i].address) {
215 curidx = i;
216 break;
217 }
218 if (curidx == -1) {
219 /* Too many breakpoints */
220 spinlock_unlock(&bkpoint_lock);
221 interrupts_restore(ipl);
222 return -1;
223 }
224 }
225 cur = &breakpoints[curidx];
226
227 cur->address = (uintptr_t) where;
228 cur->flags = flags;
229 cur->counter = 0;
230
231 setup_dr(curidx);
232
233 spinlock_unlock(&bkpoint_lock);
234 interrupts_restore(ipl);
235
236 /* Send IPI */
237#ifdef CONFIG_SMP
238// ipi_broadcast(VECTOR_DEBUG_IPI);
239#endif
240
241 return curidx;
242}
243
244#ifdef amd64
245# define getip(x) ((x)->rip)
246#else
247# define getip(x) ((x)->eip)
248#endif
249
250static void handle_exception(int slot, istate_t *istate)
251{
252 ASSERT(breakpoints[slot].address);
253
254 /* Handle zero checker */
255 if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
256 if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
257 if (*((unative_t *) breakpoints[slot].address) != 0)
258 return;
259 printf("**** Found ZERO on address %lx (slot %d) ****\n",
260 breakpoints[slot].address, slot);
261 } else {
262 printf("Data watchpoint - new data: %lx\n",
263 *((unative_t *) breakpoints[slot].address));
264 }
265 }
266 printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
267 get_symtab_entry(getip(istate)));
268 printf("***Type 'exit' to exit kconsole.\n");
269 atomic_set(&haltstate,1);
270 kconsole((void *) "debug");
271 atomic_set(&haltstate,0);
272}
273
274void breakpoint_del(int slot)
275{
276 bpinfo_t *cur;
277 ipl_t ipl;
278
279 ipl = interrupts_disable();
280 spinlock_lock(&bkpoint_lock);
281
282 cur = &breakpoints[slot];
283 if (!cur->address) {
284 spinlock_unlock(&bkpoint_lock);
285 interrupts_restore(ipl);
286 return;
287 }
288
289 cur->address = NULL;
290
291 setup_dr(slot);
292
293 spinlock_unlock(&bkpoint_lock);
294 interrupts_restore(ipl);
295#ifdef CONFIG_SMP
296// ipi_broadcast(VECTOR_DEBUG_IPI);
297#endif
298}
299
300#ifndef CONFIG_DEBUG_AS_WATCHPOINT
301
302/** Remove breakpoint from table */
303int cmd_del_breakpoint(cmd_arg_t *argv)
304{
305 unative_t bpno = argv->intval;
306 if (bpno > BKPOINTS_MAX) {
307 printf("Invalid breakpoint number.\n");
308 return 0;
309 }
310 breakpoint_del(argv->intval);
311 return 1;
312}
313
314/** Add new breakpoint to table */
315static int cmd_add_breakpoint(cmd_arg_t *argv)
316{
317 int flags;
318 int id;
319
320 if (argv == &add_argv) {
321 flags = BKPOINT_INSTR;
322 } else { /* addwatchp */
323 flags = BKPOINT_WRITE;
324 }
325 printf("Adding breakpoint on address: %p\n", argv->intval);
326 id = breakpoint_add((void *)argv->intval, flags, -1);
327 if (id < 0)
328 printf("Add breakpoint failed.\n");
329 else
330 printf("Added breakpoint %d.\n", id);
331
332 return 1;
333}
334#endif
335
336static void debug_exception(int n __attribute__((unused)), istate_t *istate)
337{
338 unative_t dr6;
339 int i;
340
341 /* Set RF to restart the instruction */
342#ifdef amd64
343 istate->rflags |= RFLAGS_RF;
344#else
345 istate->eflags |= EFLAGS_RF;
346#endif
347
348 dr6 = read_dr6();
349 for (i=0; i < BKPOINTS_MAX; i++) {
350 if (dr6 & (1 << i)) {
351 dr6 &= ~ (1 << i);
352 write_dr6(dr6);
353
354 handle_exception(i, istate);
355 }
356 }
357}
358
359#ifdef CONFIG_SMP
360static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
361{
362 int i;
363
364 spinlock_lock(&bkpoint_lock);
365 for (i = 0; i < BKPOINTS_MAX; i++)
366 setup_dr(i);
367 spinlock_unlock(&bkpoint_lock);
368}
369#endif
370
371/** Initialize debugger */
372void debugger_init()
373{
374 int i;
375
376 for (i=0; i<BKPOINTS_MAX; i++)
377 breakpoints[i].address = NULL;
378
379 cmd_initialize(&bkpts_info);
380 if (!cmd_register(&bkpts_info))
381 panic("could not register command %s\n", bkpts_info.name);
382
383#ifndef CONFIG_DEBUG_AS_WATCHPOINT
384 cmd_initialize(&delbkpt_info);
385 if (!cmd_register(&delbkpt_info))
386 panic("could not register command %s\n", delbkpt_info.name);
387
388 cmd_initialize(&addbkpt_info);
389 if (!cmd_register(&addbkpt_info))
390 panic("could not register command %s\n", addbkpt_info.name);
391
392 cmd_initialize(&addwatchp_info);
393 if (!cmd_register(&addwatchp_info))
394 panic("could not register command %s\n", addwatchp_info.name);
395#endif
396
397 exc_register(VECTOR_DEBUG, "debugger",
398 debug_exception);
399#ifdef CONFIG_SMP
400 exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
401 debug_ipi);
402#endif
403}
404
405/** @}
406 */
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