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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;
2712 decky 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++)
1072 palkovsky 119
        if (breakpoints[i].address) {
120
            symbol = get_symtab_entry(breakpoints[i].address);
2712 decky 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);
1072 palkovsky 128
        }
129
    return 1;
130
}
131
 
1077 palkovsky 132
/* Setup DR register according to table */
133
static void setup_dr(int curidx)
134
{
1780 jermar 135
    unative_t dr7;
1077 palkovsky 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)
1780 jermar 166
                dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
1077 palkovsky 167
            else /* 8 */
1780 jermar 168
                dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
1077 palkovsky 169
 
170
            if ((flags & BKPOINT_WRITE))
1780 jermar 171
                dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
1077 palkovsky 172
            else if ((flags & BKPOINT_READ_WRITE))
1780 jermar 173
                dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
1077 palkovsky 174
        }
175
 
176
        /* Enable global breakpoint */
177
        dr7 |= 0x2 << (curidx*2);
178
 
179
        write_dr7(dr7);
180
 
181
    }
182
}
183
 
1072 palkovsky 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
 */
2441 decky 190
int breakpoint_add(const void *where, const int flags, int curidx)
1072 palkovsky 191
{
192
    ipl_t ipl;
193
    int i;
1077 palkovsky 194
    bpinfo_t *cur;
1072 palkovsky 195
 
2441 decky 196
    ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
1072 palkovsky 197
 
198
    ipl = interrupts_disable();
199
    spinlock_lock(&bkpoint_lock);
200
 
1077 palkovsky 201
    if (curidx == -1) {
202
        /* Find free space in slots */
2441 decky 203
        for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 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;
1072 palkovsky 213
        }
214
    }
1077 palkovsky 215
    cur = &breakpoints[curidx];
216
 
1780 jermar 217
    cur->address = (uintptr_t) where;
1072 palkovsky 218
    cur->flags = flags;
219
    cur->counter = 0;
220
 
1077 palkovsky 221
    setup_dr(curidx);
1072 palkovsky 222
 
223
    spinlock_unlock(&bkpoint_lock);
224
    interrupts_restore(ipl);
225
 
1077 palkovsky 226
    /* Send IPI */
227
#ifdef CONFIG_SMP
228
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
229
#endif  
230
 
1072 palkovsky 231
    return curidx;
232
}
233
 
1074 palkovsky 234
#ifdef amd64
2441 decky 235
#   define getip(x) ((x)->rip)
1074 palkovsky 236
#else
2441 decky 237
#   define getip(x) ((x)->eip)
1074 palkovsky 238
#endif
239
 
1072 palkovsky 240
static 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)) {
1780 jermar 247
            if (*((unative_t *) breakpoints[slot].address) != 0)
1072 palkovsky 248
                return;
2441 decky 249
            printf("**** Found ZERO on address %lx (slot %d) ****\n",
250
                breakpoints[slot].address, slot);
1072 palkovsky 251
        } else {
2441 decky 252
            printf("Data watchpoint - new data: %lx\n",
1780 jermar 253
                   *((unative_t *) breakpoints[slot].address));
1072 palkovsky 254
        }
255
    }
2441 decky 256
    printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
1074 palkovsky 257
           get_symtab_entry(getip(istate)));
1072 palkovsky 258
    printf("***Type 'exit' to exit kconsole.\n");
259
    atomic_set(&haltstate,1);
2100 decky 260
    kconsole((void *) "debug");
1072 palkovsky 261
    atomic_set(&haltstate,0);
262
}
263
 
264
void 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
 
1077 palkovsky 281
    setup_dr(slot);
1072 palkovsky 282
 
283
    spinlock_unlock(&bkpoint_lock);
284
    interrupts_restore(ipl);
1077 palkovsky 285
#ifdef CONFIG_SMP
286
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
287
#endif
1072 palkovsky 288
}
289
 
1077 palkovsky 290
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
291
 
1072 palkovsky 292
/** Remove breakpoint from table */
293
int cmd_del_breakpoint(cmd_arg_t *argv)
294
{
2767 jermar 295
    unative_t bpno = argv->intval;
296
    if (bpno > BKPOINTS_MAX) {
1072 palkovsky 297
        printf("Invalid breakpoint number.\n");
298
        return 0;
299
    }
300
    breakpoint_del(argv->intval);
301
    return 1;
302
}
303
 
304
/** Add new breakpoint to table */
305
static int cmd_add_breakpoint(cmd_arg_t *argv)
306
{
307
    int flags;
1077 palkovsky 308
    int id;
1072 palkovsky 309
 
310
    if (argv == &add_argv) {
311
        flags = BKPOINT_INSTR;
312
    } else { /* addwatchp */
313
        flags = BKPOINT_WRITE;
314
    }
315
    printf("Adding breakpoint on address: %p\n", argv->intval);
1077 palkovsky 316
    id = breakpoint_add((void *)argv->intval, flags, -1);
317
    if (id < 0)
1072 palkovsky 318
        printf("Add breakpoint failed.\n");
1077 palkovsky 319
    else
320
        printf("Added breakpoint %d.\n", id);
1072 palkovsky 321
 
322
    return 1;
323
}
1077 palkovsky 324
#endif
1072 palkovsky 325
 
2441 decky 326
static void debug_exception(int n __attribute__((unused)), istate_t *istate)
1077 palkovsky 327
{
1780 jermar 328
    unative_t dr6;
1077 palkovsky 329
    int i;
330
 
331
    /* Set RF to restart the instruction  */
332
#ifdef amd64       
333
    istate->rflags |= RFLAGS_RF;
334
#else
335
    istate->eflags |= EFLAGS_RF;
336
#endif
337
 
338
    dr6 = read_dr6();
339
    for (i=0; i < BKPOINTS_MAX; i++) {
340
        if (dr6 & (1 << i)) {
341
            dr6 &= ~ (1 << i);
342
            write_dr6(dr6);
343
 
344
            handle_exception(i, istate);
345
        }
346
    }
347
}
348
 
349
#ifdef CONFIG_SMP
2441 decky 350
static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
1077 palkovsky 351
{
352
    int i;
353
 
354
    spinlock_lock(&bkpoint_lock);
2441 decky 355
    for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 356
        setup_dr(i);
357
    spinlock_unlock(&bkpoint_lock);
358
}
359
#endif
360
 
1072 palkovsky 361
/** Initialize debugger */
362
void debugger_init()
363
{
364
    int i;
365
 
366
    for (i=0; i<BKPOINTS_MAX; i++)
367
        breakpoints[i].address = NULL;
368
 
369
    cmd_initialize(&bkpts_info);
370
    if (!cmd_register(&bkpts_info))
371
        panic("could not register command %s\n", bkpts_info.name);
372
 
1077 palkovsky 373
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
1072 palkovsky 374
    cmd_initialize(&delbkpt_info);
375
    if (!cmd_register(&delbkpt_info))
376
        panic("could not register command %s\n", delbkpt_info.name);
377
 
378
    cmd_initialize(&addbkpt_info);
379
    if (!cmd_register(&addbkpt_info))
380
        panic("could not register command %s\n", addbkpt_info.name);
381
 
382
    cmd_initialize(&addwatchp_info);
383
    if (!cmd_register(&addwatchp_info))
384
        panic("could not register command %s\n", addwatchp_info.name);
1077 palkovsky 385
#endif
1072 palkovsky 386
 
387
    exc_register(VECTOR_DEBUG, "debugger",
388
             debug_exception);
1077 palkovsky 389
#ifdef CONFIG_SMP
390
    exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
391
             debug_ipi);
392
#endif
1072 palkovsky 393
}
1702 cejka 394
 
1888 jermar 395
/** @}
1702 cejka 396
 */