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1072 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Ondrej Palkovsky
1072 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
 
1888 jermar 29
/** @addtogroup amd64debug
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1072 palkovsky 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>
1077 palkovsky 46
#include <smp/ipi.h>
1072 palkovsky 47
 
48
typedef struct  {
1780 jermar 49
    uintptr_t address;      /**< Breakpoint address */
1072 palkovsky 50
    int flags;              /**< Flags regarding breakpoint */
51
    int counter;            /**< How many times the exception occured */
52
} bpinfo_t;
53
 
54
static bpinfo_t breakpoints[BKPOINTS_MAX];
55
SPINLOCK_INITIALIZE(bkpoint_lock);
56
 
57
static int cmd_print_breakpoints(cmd_arg_t *argv);
58
static cmd_info_t bkpts_info = {
59
    .name = "bkpts",
60
    .description = "Print breakpoint table.",
61
    .func = cmd_print_breakpoints,
62
    .argc = 0,
63
};
64
 
1077 palkovsky 65
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
66
 
1072 palkovsky 67
static int cmd_del_breakpoint(cmd_arg_t *argv);
68
static cmd_arg_t del_argv = {
69
    .type = ARG_TYPE_INT
70
};
71
static 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
 
79
static int cmd_add_breakpoint(cmd_arg_t *argv);
80
static cmd_arg_t add_argv = {
81
    .type = ARG_TYPE_INT
82
};
83
static 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
 
91
static cmd_arg_t addw_argv = {
92
    .type = ARG_TYPE_INT
93
};
94
static 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
 
1077 palkovsky 102
#endif
1072 palkovsky 103
 
104
/** Print table of active breakpoints */
2441 decky 105
int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
1072 palkovsky 106
{
2712 decky 107
    unsigned int i;
1072 palkovsky 108
    char *symbol;
3071 decky 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
2712 decky 119
 
120
    for (i = 0; i < BKPOINTS_MAX; i++)
1072 palkovsky 121
        if (breakpoints[i].address) {
122
            symbol = get_symtab_entry(breakpoints[i].address);
3071 decky 123
 
124
#ifdef __32_BITS__
3138 jermar 125
            printf("%-2u %-5d %#10zx %s\n", i,
126
                breakpoints[i].counter, breakpoints[i].address,
127
                symbol);
3071 decky 128
#endif
129
 
130
#ifdef __64_BITS__
3138 jermar 131
            printf("%-2u %-5d %#18zx %s\n", i,
132
                breakpoints[i].counter, breakpoints[i].address,
133
                symbol);
3071 decky 134
#endif
135
 
1072 palkovsky 136
        }
137
    return 1;
138
}
139
 
1077 palkovsky 140
/* Setup DR register according to table */
141
static void setup_dr(int curidx)
142
{
1780 jermar 143
    unative_t dr7;
1077 palkovsky 144
    bpinfo_t *cur = &breakpoints[curidx];
145
    int flags = breakpoints[curidx].flags;
146
 
147
    /* Disable breakpoint in DR7 */
148
    dr7 = read_dr7();
149
    dr7 &= ~(0x2 << (curidx*2));
150
 
151
    if (cur->address) { /* Setup DR register */
152
        /* Set breakpoint to debug registers */
153
        switch (curidx) {
154
        case 0:
155
            write_dr0(cur->address);
156
            break;
157
        case 1:
158
            write_dr1(cur->address);
159
            break;
160
        case 2:
161
            write_dr2(cur->address);
162
            break;
163
        case 3:
164
            write_dr3(cur->address);
165
            break;
166
        }
167
        /* Set type to requested breakpoint & length*/
168
        dr7 &= ~ (0x3 << (16 + 4*curidx));
169
        dr7 &= ~ (0x3 << (18 + 4*curidx));
170
        if ((flags & BKPOINT_INSTR)) {
171
            ;
172
        } else {
3071 decky 173
 
174
#ifdef __32_BITS__
175
            dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
176
#endif
177
 
178
#ifdef __64_BITS__
179
            dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
180
#endif
1077 palkovsky 181
 
182
            if ((flags & BKPOINT_WRITE))
3071 decky 183
                dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
1077 palkovsky 184
            else if ((flags & BKPOINT_READ_WRITE))
3071 decky 185
                dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
1077 palkovsky 186
        }
187
 
188
        /* Enable global breakpoint */
3138 jermar 189
        dr7 |= 0x2 << (curidx * 2);
1077 palkovsky 190
 
191
        write_dr7(dr7);
192
 
193
    }
194
}
195
 
1072 palkovsky 196
/** Enable hardware breakpoint
197
 *
198
 * @param where Address of HW breakpoint
199
 * @param flags Type of breakpoint (EXECUTE, WRITE)
200
 * @return Debug slot on success, -1 - no available HW breakpoint
201
 */
2441 decky 202
int breakpoint_add(const void *where, const int flags, int curidx)
1072 palkovsky 203
{
204
    ipl_t ipl;
205
    int i;
1077 palkovsky 206
    bpinfo_t *cur;
1072 palkovsky 207
 
2441 decky 208
    ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
1072 palkovsky 209
 
210
    ipl = interrupts_disable();
211
    spinlock_lock(&bkpoint_lock);
212
 
1077 palkovsky 213
    if (curidx == -1) {
214
        /* Find free space in slots */
2441 decky 215
        for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 216
            if (!breakpoints[i].address) {
217
                curidx = i;
218
                break;
219
            }
220
        if (curidx == -1) {
221
            /* Too many breakpoints */
222
            spinlock_unlock(&bkpoint_lock);
223
            interrupts_restore(ipl);
224
            return -1;
1072 palkovsky 225
        }
226
    }
1077 palkovsky 227
    cur = &breakpoints[curidx];
228
 
1780 jermar 229
    cur->address = (uintptr_t) where;
1072 palkovsky 230
    cur->flags = flags;
231
    cur->counter = 0;
232
 
1077 palkovsky 233
    setup_dr(curidx);
1072 palkovsky 234
 
235
    spinlock_unlock(&bkpoint_lock);
236
    interrupts_restore(ipl);
237
 
1077 palkovsky 238
    /* Send IPI */
239
#ifdef CONFIG_SMP
240
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
241
#endif  
242
 
1072 palkovsky 243
    return curidx;
244
}
245
 
1074 palkovsky 246
#ifdef amd64
2441 decky 247
#   define getip(x) ((x)->rip)
1074 palkovsky 248
#else
2441 decky 249
#   define getip(x) ((x)->eip)
1074 palkovsky 250
#endif
251
 
1072 palkovsky 252
static void handle_exception(int slot, istate_t *istate)
253
{
254
    ASSERT(breakpoints[slot].address);
255
 
256
    /* Handle zero checker */
257
    if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
258
        if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
1780 jermar 259
            if (*((unative_t *) breakpoints[slot].address) != 0)
1072 palkovsky 260
                return;
3138 jermar 261
            printf("*** Found ZERO on address %lx (slot %d) ***\n",
262
                breakpoints[slot].address, slot);
1072 palkovsky 263
        } else {
2441 decky 264
            printf("Data watchpoint - new data: %lx\n",
3138 jermar 265
                *((unative_t *) breakpoints[slot].address));
1072 palkovsky 266
        }
267
    }
2441 decky 268
    printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
3138 jermar 269
        get_symtab_entry(getip(istate)));
1072 palkovsky 270
    printf("***Type 'exit' to exit kconsole.\n");
271
    atomic_set(&haltstate,1);
2100 decky 272
    kconsole((void *) "debug");
1072 palkovsky 273
    atomic_set(&haltstate,0);
274
}
275
 
276
void breakpoint_del(int slot)
277
{
278
    bpinfo_t *cur;
279
    ipl_t ipl;
280
 
281
    ipl = interrupts_disable();
282
    spinlock_lock(&bkpoint_lock);
283
 
284
    cur = &breakpoints[slot];
285
    if (!cur->address) {
286
        spinlock_unlock(&bkpoint_lock);
287
        interrupts_restore(ipl);
288
        return;
289
    }
290
 
291
    cur->address = NULL;
292
 
1077 palkovsky 293
    setup_dr(slot);
1072 palkovsky 294
 
295
    spinlock_unlock(&bkpoint_lock);
296
    interrupts_restore(ipl);
1077 palkovsky 297
#ifdef CONFIG_SMP
298
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
299
#endif
1072 palkovsky 300
}
301
 
1077 palkovsky 302
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
303
 
1072 palkovsky 304
/** Remove breakpoint from table */
305
int cmd_del_breakpoint(cmd_arg_t *argv)
306
{
2767 jermar 307
    unative_t bpno = argv->intval;
308
    if (bpno > BKPOINTS_MAX) {
1072 palkovsky 309
        printf("Invalid breakpoint number.\n");
310
        return 0;
311
    }
312
    breakpoint_del(argv->intval);
313
    return 1;
314
}
315
 
316
/** Add new breakpoint to table */
317
static int cmd_add_breakpoint(cmd_arg_t *argv)
318
{
319
    int flags;
1077 palkovsky 320
    int id;
1072 palkovsky 321
 
322
    if (argv == &add_argv) {
323
        flags = BKPOINT_INSTR;
324
    } else { /* addwatchp */
325
        flags = BKPOINT_WRITE;
326
    }
327
    printf("Adding breakpoint on address: %p\n", argv->intval);
1077 palkovsky 328
    id = breakpoint_add((void *)argv->intval, flags, -1);
329
    if (id < 0)
1072 palkovsky 330
        printf("Add breakpoint failed.\n");
1077 palkovsky 331
    else
332
        printf("Added breakpoint %d.\n", id);
1072 palkovsky 333
 
334
    return 1;
335
}
1077 palkovsky 336
#endif
1072 palkovsky 337
 
2441 decky 338
static void debug_exception(int n __attribute__((unused)), istate_t *istate)
1077 palkovsky 339
{
1780 jermar 340
    unative_t dr6;
1077 palkovsky 341
    int i;
342
 
343
    /* Set RF to restart the instruction  */
344
#ifdef amd64       
345
    istate->rflags |= RFLAGS_RF;
346
#else
347
    istate->eflags |= EFLAGS_RF;
348
#endif
349
 
350
    dr6 = read_dr6();
351
    for (i=0; i < BKPOINTS_MAX; i++) {
352
        if (dr6 & (1 << i)) {
353
            dr6 &= ~ (1 << i);
354
            write_dr6(dr6);
355
 
356
            handle_exception(i, istate);
357
        }
358
    }
359
}
360
 
361
#ifdef CONFIG_SMP
3138 jermar 362
static void
363
debug_ipi(int n __attribute__((unused)),
364
    istate_t *istate __attribute__((unused)))
1077 palkovsky 365
{
366
    int i;
367
 
368
    spinlock_lock(&bkpoint_lock);
2441 decky 369
    for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 370
        setup_dr(i);
371
    spinlock_unlock(&bkpoint_lock);
372
}
373
#endif
374
 
1072 palkovsky 375
/** Initialize debugger */
376
void debugger_init()
377
{
378
    int i;
379
 
3138 jermar 380
    for (i = 0; i < BKPOINTS_MAX; i++)
1072 palkovsky 381
        breakpoints[i].address = NULL;
382
 
383
    cmd_initialize(&bkpts_info);
384
    if (!cmd_register(&bkpts_info))
385
        panic("could not register command %s\n", bkpts_info.name);
386
 
1077 palkovsky 387
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
1072 palkovsky 388
    cmd_initialize(&delbkpt_info);
389
    if (!cmd_register(&delbkpt_info))
390
        panic("could not register command %s\n", delbkpt_info.name);
391
 
392
    cmd_initialize(&addbkpt_info);
393
    if (!cmd_register(&addbkpt_info))
394
        panic("could not register command %s\n", addbkpt_info.name);
395
 
396
    cmd_initialize(&addwatchp_info);
397
    if (!cmd_register(&addwatchp_info))
398
        panic("could not register command %s\n", addwatchp_info.name);
1077 palkovsky 399
#endif
1072 palkovsky 400
 
3138 jermar 401
    exc_register(VECTOR_DEBUG, "debugger", debug_exception);
1077 palkovsky 402
#ifdef CONFIG_SMP
3138 jermar 403
    exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
1077 palkovsky 404
#endif
1072 palkovsky 405
}
1702 cejka 406
 
1888 jermar 407
/** @}
1702 cejka 408
 */