source: mainline/kernel/arch/amd64/src/debugger.c@ 3dea17f

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 3dea17f was 06e1e95, checked in by Jakub Jermar <jakub@…>, 19 years ago

C99 compliant header guards (hopefully) everywhere in the kernel.
Formatting and indentation changes.
Small improvements in sparc64.
  • Property mode set to 100644
File size: 8.9 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)
106{
107 int i;
108 char *symbol;
109
110 printf("Breakpoint table.\n");
111 for (i=0; i < BKPOINTS_MAX; i++)
112 if (breakpoints[i].address) {
113 symbol = get_symtab_entry(breakpoints[i].address);
114 printf("%d. %p in %s\n",i,
115 breakpoints[i].address, symbol);
116 printf(" Count(%d) ", breakpoints[i].counter);
117 printf("\n");
118 }
119 return 1;
120}
121
122/* Setup DR register according to table */
123static void setup_dr(int curidx)
124{
125 unative_t dr7;
126 bpinfo_t *cur = &breakpoints[curidx];
127 int flags = breakpoints[curidx].flags;
128
129 /* Disable breakpoint in DR7 */
130 dr7 = read_dr7();
131 dr7 &= ~(0x2 << (curidx*2));
132
133 if (cur->address) { /* Setup DR register */
134 /* Set breakpoint to debug registers */
135 switch (curidx) {
136 case 0:
137 write_dr0(cur->address);
138 break;
139 case 1:
140 write_dr1(cur->address);
141 break;
142 case 2:
143 write_dr2(cur->address);
144 break;
145 case 3:
146 write_dr3(cur->address);
147 break;
148 }
149 /* Set type to requested breakpoint & length*/
150 dr7 &= ~ (0x3 << (16 + 4*curidx));
151 dr7 &= ~ (0x3 << (18 + 4*curidx));
152 if ((flags & BKPOINT_INSTR)) {
153 ;
154 } else {
155 if (sizeof(int) == 4)
156 dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
157 else /* 8 */
158 dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
159
160 if ((flags & BKPOINT_WRITE))
161 dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
162 else if ((flags & BKPOINT_READ_WRITE))
163 dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
164 }
165
166 /* Enable global breakpoint */
167 dr7 |= 0x2 << (curidx*2);
168
169 write_dr7(dr7);
170
171 }
172}
173
174/** Enable hardware breakpoint
175 *
176 *
177 * @param where Address of HW breakpoint
178 * @param flags Type of breakpoint (EXECUTE, WRITE)
179 * @return Debug slot on success, -1 - no available HW breakpoint
180 */
181int breakpoint_add(void * where, int flags, int curidx)
182{
183 ipl_t ipl;
184 int i;
185 bpinfo_t *cur;
186
187 ASSERT( flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
188
189 ipl = interrupts_disable();
190 spinlock_lock(&bkpoint_lock);
191
192 if (curidx == -1) {
193 /* Find free space in slots */
194 for (i=0; i<BKPOINTS_MAX; i++)
195 if (!breakpoints[i].address) {
196 curidx = i;
197 break;
198 }
199 if (curidx == -1) {
200 /* Too many breakpoints */
201 spinlock_unlock(&bkpoint_lock);
202 interrupts_restore(ipl);
203 return -1;
204 }
205 }
206 cur = &breakpoints[curidx];
207
208 cur->address = (uintptr_t) where;
209 cur->flags = flags;
210 cur->counter = 0;
211
212 setup_dr(curidx);
213
214 spinlock_unlock(&bkpoint_lock);
215 interrupts_restore(ipl);
216
217 /* Send IPI */
218#ifdef CONFIG_SMP
219// ipi_broadcast(VECTOR_DEBUG_IPI);
220#endif
221
222 return curidx;
223}
224
225#ifdef amd64
226# define getip(x) ((x)->rip)
227#else
228# define getip(x) ((x)->eip)
229#endif
230
231static void handle_exception(int slot, istate_t *istate)
232{
233 ASSERT(breakpoints[slot].address);
234
235 /* Handle zero checker */
236 if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
237 if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
238 if (*((unative_t *) breakpoints[slot].address) != 0)
239 return;
240 printf("**** Found ZERO on address %p ****\n",
241 slot, breakpoints[slot].address);
242 } else {
243 printf("Data watchpoint - new data: %p\n",
244 *((unative_t *) breakpoints[slot].address));
245 }
246 }
247 printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),
248 get_symtab_entry(getip(istate)));
249 printf("***Type 'exit' to exit kconsole.\n");
250 atomic_set(&haltstate,1);
251 kconsole("debug");
252 atomic_set(&haltstate,0);
253}
254
255void breakpoint_del(int slot)
256{
257 bpinfo_t *cur;
258 ipl_t ipl;
259
260 ipl = interrupts_disable();
261 spinlock_lock(&bkpoint_lock);
262
263 cur = &breakpoints[slot];
264 if (!cur->address) {
265 spinlock_unlock(&bkpoint_lock);
266 interrupts_restore(ipl);
267 return;
268 }
269
270 cur->address = NULL;
271
272 setup_dr(slot);
273
274 spinlock_unlock(&bkpoint_lock);
275 interrupts_restore(ipl);
276#ifdef CONFIG_SMP
277// ipi_broadcast(VECTOR_DEBUG_IPI);
278#endif
279}
280
281#ifndef CONFIG_DEBUG_AS_WATCHPOINT
282
283/** Remove breakpoint from table */
284int cmd_del_breakpoint(cmd_arg_t *argv)
285{
286 if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
287 printf("Invalid breakpoint number.\n");
288 return 0;
289 }
290 breakpoint_del(argv->intval);
291 return 1;
292}
293
294/** Add new breakpoint to table */
295static int cmd_add_breakpoint(cmd_arg_t *argv)
296{
297 int flags;
298 int id;
299
300 if (argv == &add_argv) {
301 flags = BKPOINT_INSTR;
302 } else { /* addwatchp */
303 flags = BKPOINT_WRITE;
304 }
305 printf("Adding breakpoint on address: %p\n", argv->intval);
306 id = breakpoint_add((void *)argv->intval, flags, -1);
307 if (id < 0)
308 printf("Add breakpoint failed.\n");
309 else
310 printf("Added breakpoint %d.\n", id);
311
312 return 1;
313}
314#endif
315
316static void debug_exception(int n, istate_t *istate)
317{
318 unative_t dr6;
319 int i;
320
321 /* Set RF to restart the instruction */
322#ifdef amd64
323 istate->rflags |= RFLAGS_RF;
324#else
325 istate->eflags |= EFLAGS_RF;
326#endif
327
328 dr6 = read_dr6();
329 for (i=0; i < BKPOINTS_MAX; i++) {
330 if (dr6 & (1 << i)) {
331 dr6 &= ~ (1 << i);
332 write_dr6(dr6);
333
334 handle_exception(i, istate);
335 }
336 }
337}
338
339#ifdef CONFIG_SMP
340static void debug_ipi(int n, istate_t *istate)
341{
342 int i;
343
344 spinlock_lock(&bkpoint_lock);
345 for (i=0; i < BKPOINTS_MAX; i++)
346 setup_dr(i);
347 spinlock_unlock(&bkpoint_lock);
348}
349#endif
350
351/** Initialize debugger */
352void debugger_init()
353{
354 int i;
355
356 for (i=0; i<BKPOINTS_MAX; i++)
357 breakpoints[i].address = NULL;
358
359 cmd_initialize(&bkpts_info);
360 if (!cmd_register(&bkpts_info))
361 panic("could not register command %s\n", bkpts_info.name);
362
363#ifndef CONFIG_DEBUG_AS_WATCHPOINT
364 cmd_initialize(&delbkpt_info);
365 if (!cmd_register(&delbkpt_info))
366 panic("could not register command %s\n", delbkpt_info.name);
367
368 cmd_initialize(&addbkpt_info);
369 if (!cmd_register(&addbkpt_info))
370 panic("could not register command %s\n", addbkpt_info.name);
371
372 cmd_initialize(&addwatchp_info);
373 if (!cmd_register(&addwatchp_info))
374 panic("could not register command %s\n", addwatchp_info.name);
375#endif
376
377 exc_register(VECTOR_DEBUG, "debugger",
378 debug_exception);
379#ifdef CONFIG_SMP
380 exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
381 debug_ipi);
382#endif
383}
384
385/** @}
386 */
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