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1072 palkovsky 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
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   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.
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 *
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
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * 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
 
1702 cejka 29
 /** @addtogroup amd64debug ia32/amd64
30
 * @ingroup debug
31
 * @{
32
 */
33
/** @file
34
 */
35
 
1072 palkovsky 36
#include <arch/debugger.h>
37
#include <console/kconsole.h>
38
#include <console/cmd.h>
39
#include <symtab.h>
40
#include <print.h>
41
#include <panic.h>
42
#include <interrupt.h>
43
#include <arch/asm.h>
44
#include <arch/cpu.h>
45
#include <debug.h>
46
#include <func.h>
1077 palkovsky 47
#include <smp/ipi.h>
1072 palkovsky 48
 
49
typedef struct  {
50
    __address address;      /**< Breakpoint address */
51
    int flags;              /**< Flags regarding breakpoint */
52
    int counter;            /**< How many times the exception occured */
53
} bpinfo_t;
54
 
55
static bpinfo_t breakpoints[BKPOINTS_MAX];
56
SPINLOCK_INITIALIZE(bkpoint_lock);
57
 
58
static int cmd_print_breakpoints(cmd_arg_t *argv);
59
static cmd_info_t bkpts_info = {
60
    .name = "bkpts",
61
    .description = "Print breakpoint table.",
62
    .func = cmd_print_breakpoints,
63
    .argc = 0,
64
};
65
 
1077 palkovsky 66
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
67
 
1072 palkovsky 68
static int cmd_del_breakpoint(cmd_arg_t *argv);
69
static cmd_arg_t del_argv = {
70
    .type = ARG_TYPE_INT
71
};
72
static cmd_info_t delbkpt_info = {
73
    .name = "delbkpt",
74
    .description = "delbkpt <number> - Delete breakpoint.",
75
    .func = cmd_del_breakpoint,
76
    .argc = 1,
77
    .argv = &del_argv
78
};
79
 
80
static int cmd_add_breakpoint(cmd_arg_t *argv);
81
static cmd_arg_t add_argv = {
82
    .type = ARG_TYPE_INT
83
};
84
static cmd_info_t addbkpt_info = {
85
    .name = "addbkpt",
86
    .description = "addbkpt <&symbol> - new breakpoint.",
87
    .func = cmd_add_breakpoint,
88
    .argc = 1,
89
    .argv = &add_argv
90
};
91
 
92
static cmd_arg_t addw_argv = {
93
    .type = ARG_TYPE_INT
94
};
95
static cmd_info_t addwatchp_info = {
96
    .name = "addwatchp",
97
    .description = "addbwatchp <&symbol> - new write watchpoint.",
98
    .func = cmd_add_breakpoint,
99
    .argc = 1,
100
    .argv = &addw_argv
101
};
102
 
1077 palkovsky 103
#endif
1072 palkovsky 104
 
105
/** Print table of active breakpoints */
106
int cmd_print_breakpoints(cmd_arg_t *argv)
107
{
108
    int i;
109
    char *symbol;
110
 
111
    printf("Breakpoint table.\n");
112
    for (i=0; i < BKPOINTS_MAX; i++)
113
        if (breakpoints[i].address) {
114
            symbol = get_symtab_entry(breakpoints[i].address);
1196 cejka 115
            printf("%d. %p in %s\n",i,
1072 palkovsky 116
                   breakpoints[i].address, symbol);
117
            printf("     Count(%d) ", breakpoints[i].counter);
118
            printf("\n");
119
        }
120
    return 1;
121
}
122
 
1077 palkovsky 123
/* Setup DR register according to table */
124
static void setup_dr(int curidx)
125
{
126
    __native dr7;
127
    bpinfo_t *cur = &breakpoints[curidx];
128
    int flags = breakpoints[curidx].flags;
129
 
130
    /* Disable breakpoint in DR7 */
131
    dr7 = read_dr7();
132
    dr7 &= ~(0x2 << (curidx*2));
133
 
134
    if (cur->address) { /* Setup DR register */
135
        /* Set breakpoint to debug registers */
136
        switch (curidx) {
137
        case 0:
138
            write_dr0(cur->address);
139
            break;
140
        case 1:
141
            write_dr1(cur->address);
142
            break;
143
        case 2:
144
            write_dr2(cur->address);
145
            break;
146
        case 3:
147
            write_dr3(cur->address);
148
            break;
149
        }
150
        /* Set type to requested breakpoint & length*/
151
        dr7 &= ~ (0x3 << (16 + 4*curidx));
152
        dr7 &= ~ (0x3 << (18 + 4*curidx));
153
        if ((flags & BKPOINT_INSTR)) {
154
            ;
155
        } else {
156
            if (sizeof(int) == 4)
157
                dr7 |= ((__native) 0x3) << (18 + 4*curidx);
158
            else /* 8 */
159
                dr7 |= ((__native) 0x2) << (18 + 4*curidx);
160
 
161
            if ((flags & BKPOINT_WRITE))
162
                dr7 |= ((__native) 0x1) << (16 + 4*curidx);
163
            else if ((flags & BKPOINT_READ_WRITE))
164
                dr7 |= ((__native) 0x3) << (16 + 4*curidx);
165
        }
166
 
167
        /* Enable global breakpoint */
168
        dr7 |= 0x2 << (curidx*2);
169
 
170
        write_dr7(dr7);
171
 
172
    }
173
}
174
 
1072 palkovsky 175
/** Enable hardware breakpoint
176
 *
177
 *
178
 * @param where Address of HW breakpoint
179
 * @param flags Type of breakpoint (EXECUTE, WRITE)
180
 * @return Debug slot on success, -1 - no available HW breakpoint
181
 */
1077 palkovsky 182
int breakpoint_add(void * where, int flags, int curidx)
1072 palkovsky 183
{
184
    ipl_t ipl;
185
    int i;
1077 palkovsky 186
    bpinfo_t *cur;
1072 palkovsky 187
 
188
    ASSERT( flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
189
 
190
    ipl = interrupts_disable();
191
    spinlock_lock(&bkpoint_lock);
192
 
1077 palkovsky 193
    if (curidx == -1) {
194
        /* Find free space in slots */
195
        for (i=0; i<BKPOINTS_MAX; i++)
196
            if (!breakpoints[i].address) {
197
                curidx = i;
198
                break;
199
            }
200
        if (curidx == -1) {
201
            /* Too many breakpoints */
202
            spinlock_unlock(&bkpoint_lock);
203
            interrupts_restore(ipl);
204
            return -1;
1072 palkovsky 205
        }
206
    }
1077 palkovsky 207
    cur = &breakpoints[curidx];
208
 
1072 palkovsky 209
    cur->address = (__address) where;
210
    cur->flags = flags;
211
    cur->counter = 0;
212
 
1077 palkovsky 213
    setup_dr(curidx);
1072 palkovsky 214
 
215
    spinlock_unlock(&bkpoint_lock);
216
    interrupts_restore(ipl);
217
 
1077 palkovsky 218
    /* Send IPI */
219
#ifdef CONFIG_SMP
220
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
221
#endif  
222
 
1072 palkovsky 223
    return curidx;
224
}
225
 
1074 palkovsky 226
#ifdef amd64
227
# define getip(x)  ((x)->rip)
228
#else
229
# define getip(x)  ((x)->eip)
230
#endif
231
 
1072 palkovsky 232
static void handle_exception(int slot, istate_t *istate)
233
{
234
    ASSERT(breakpoints[slot].address);
235
 
236
    /* Handle zero checker */
237
    if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
238
        if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
239
            if (*((__native *) breakpoints[slot].address) != 0)
240
                return;
1221 decky 241
            printf("**** Found ZERO on address %p ****\n",
1072 palkovsky 242
                   slot, breakpoints[slot].address);
243
        } else {
1221 decky 244
            printf("Data watchpoint - new data: %p\n",
1072 palkovsky 245
                   *((__native *) breakpoints[slot].address));
246
        }
247
    }
1221 decky 248
    printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),
1074 palkovsky 249
           get_symtab_entry(getip(istate)));
1072 palkovsky 250
    printf("***Type 'exit' to exit kconsole.\n");
251
    atomic_set(&haltstate,1);
252
    kconsole("debug");
253
    atomic_set(&haltstate,0);
254
}
255
 
256
void breakpoint_del(int slot)
257
{
258
    bpinfo_t *cur;
259
    ipl_t ipl;
260
 
261
    ipl = interrupts_disable();
262
    spinlock_lock(&bkpoint_lock);
263
 
264
    cur = &breakpoints[slot];
265
    if (!cur->address) {
266
        spinlock_unlock(&bkpoint_lock);
267
        interrupts_restore(ipl);
268
        return;
269
    }
270
 
271
    cur->address = NULL;
272
 
1077 palkovsky 273
    setup_dr(slot);
1072 palkovsky 274
 
275
    spinlock_unlock(&bkpoint_lock);
276
    interrupts_restore(ipl);
1077 palkovsky 277
#ifdef CONFIG_SMP
278
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
279
#endif
1072 palkovsky 280
}
281
 
1077 palkovsky 282
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
283
 
1072 palkovsky 284
/** Remove breakpoint from table */
285
int cmd_del_breakpoint(cmd_arg_t *argv)
286
{
287
    if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
288
        printf("Invalid breakpoint number.\n");
289
        return 0;
290
    }
291
    breakpoint_del(argv->intval);
292
    return 1;
293
}
294
 
295
/** Add new breakpoint to table */
296
static int cmd_add_breakpoint(cmd_arg_t *argv)
297
{
298
    int flags;
1077 palkovsky 299
    int id;
1072 palkovsky 300
 
301
    if (argv == &add_argv) {
302
        flags = BKPOINT_INSTR;
303
    } else { /* addwatchp */
304
        flags = BKPOINT_WRITE;
305
    }
306
    printf("Adding breakpoint on address: %p\n", argv->intval);
1077 palkovsky 307
    id = breakpoint_add((void *)argv->intval, flags, -1);
308
    if (id < 0)
1072 palkovsky 309
        printf("Add breakpoint failed.\n");
1077 palkovsky 310
    else
311
        printf("Added breakpoint %d.\n", id);
1072 palkovsky 312
 
313
    return 1;
314
}
1077 palkovsky 315
#endif
1072 palkovsky 316
 
1077 palkovsky 317
static void debug_exception(int n, istate_t *istate)
318
{
319
    __native dr6;
320
    int i;
321
 
322
    /* Set RF to restart the instruction  */
323
#ifdef amd64       
324
    istate->rflags |= RFLAGS_RF;
325
#else
326
    istate->eflags |= EFLAGS_RF;
327
#endif
328
 
329
    dr6 = read_dr6();
330
    for (i=0; i < BKPOINTS_MAX; i++) {
331
        if (dr6 & (1 << i)) {
332
            dr6 &= ~ (1 << i);
333
            write_dr6(dr6);
334
 
335
            handle_exception(i, istate);
336
        }
337
    }
338
}
339
 
340
#ifdef CONFIG_SMP
341
static void debug_ipi(int n, istate_t *istate)
342
{
343
    int i;
344
 
345
    spinlock_lock(&bkpoint_lock);
346
    for (i=0; i < BKPOINTS_MAX; i++)
347
        setup_dr(i);
348
    spinlock_unlock(&bkpoint_lock);
349
}
350
#endif
351
 
1072 palkovsky 352
/** Initialize debugger */
353
void debugger_init()
354
{
355
    int i;
356
 
357
    for (i=0; i<BKPOINTS_MAX; i++)
358
        breakpoints[i].address = NULL;
359
 
360
    cmd_initialize(&bkpts_info);
361
    if (!cmd_register(&bkpts_info))
362
        panic("could not register command %s\n", bkpts_info.name);
363
 
1077 palkovsky 364
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
1072 palkovsky 365
    cmd_initialize(&delbkpt_info);
366
    if (!cmd_register(&delbkpt_info))
367
        panic("could not register command %s\n", delbkpt_info.name);
368
 
369
    cmd_initialize(&addbkpt_info);
370
    if (!cmd_register(&addbkpt_info))
371
        panic("could not register command %s\n", addbkpt_info.name);
372
 
373
    cmd_initialize(&addwatchp_info);
374
    if (!cmd_register(&addwatchp_info))
375
        panic("could not register command %s\n", addwatchp_info.name);
1077 palkovsky 376
#endif
1072 palkovsky 377
 
378
    exc_register(VECTOR_DEBUG, "debugger",
379
             debug_exception);
1077 palkovsky 380
#ifdef CONFIG_SMP
381
    exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
382
             debug_ipi);
383
#endif
1072 palkovsky 384
}
1702 cejka 385
 
386
 /** @}
387
 */
388