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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
{
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);
2441 decky 114
            printf("%d. %lx in %s\n", i,
1072 palkovsky 115
                   breakpoints[i].address, symbol);
116
            printf("     Count(%d) ", breakpoints[i].counter);
117
            printf("\n");
118
        }
119
    return 1;
120
}
121
 
1077 palkovsky 122
/* Setup DR register according to table */
123
static void setup_dr(int curidx)
124
{
1780 jermar 125
    unative_t dr7;
1077 palkovsky 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)
1780 jermar 156
                dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
1077 palkovsky 157
            else /* 8 */
1780 jermar 158
                dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
1077 palkovsky 159
 
160
            if ((flags & BKPOINT_WRITE))
1780 jermar 161
                dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
1077 palkovsky 162
            else if ((flags & BKPOINT_READ_WRITE))
1780 jermar 163
                dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
1077 palkovsky 164
        }
165
 
166
        /* Enable global breakpoint */
167
        dr7 |= 0x2 << (curidx*2);
168
 
169
        write_dr7(dr7);
170
 
171
    }
172
}
173
 
1072 palkovsky 174
/** Enable hardware breakpoint
175
 *
176
 * @param where Address of HW breakpoint
177
 * @param flags Type of breakpoint (EXECUTE, WRITE)
178
 * @return Debug slot on success, -1 - no available HW breakpoint
179
 */
2441 decky 180
int breakpoint_add(const void *where, const int flags, int curidx)
1072 palkovsky 181
{
182
    ipl_t ipl;
183
    int i;
1077 palkovsky 184
    bpinfo_t *cur;
1072 palkovsky 185
 
2441 decky 186
    ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
1072 palkovsky 187
 
188
    ipl = interrupts_disable();
189
    spinlock_lock(&bkpoint_lock);
190
 
1077 palkovsky 191
    if (curidx == -1) {
192
        /* Find free space in slots */
2441 decky 193
        for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 194
            if (!breakpoints[i].address) {
195
                curidx = i;
196
                break;
197
            }
198
        if (curidx == -1) {
199
            /* Too many breakpoints */
200
            spinlock_unlock(&bkpoint_lock);
201
            interrupts_restore(ipl);
202
            return -1;
1072 palkovsky 203
        }
204
    }
1077 palkovsky 205
    cur = &breakpoints[curidx];
206
 
1780 jermar 207
    cur->address = (uintptr_t) where;
1072 palkovsky 208
    cur->flags = flags;
209
    cur->counter = 0;
210
 
1077 palkovsky 211
    setup_dr(curidx);
1072 palkovsky 212
 
213
    spinlock_unlock(&bkpoint_lock);
214
    interrupts_restore(ipl);
215
 
1077 palkovsky 216
    /* Send IPI */
217
#ifdef CONFIG_SMP
218
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
219
#endif  
220
 
1072 palkovsky 221
    return curidx;
222
}
223
 
1074 palkovsky 224
#ifdef amd64
2441 decky 225
#   define getip(x) ((x)->rip)
1074 palkovsky 226
#else
2441 decky 227
#   define getip(x) ((x)->eip)
1074 palkovsky 228
#endif
229
 
1072 palkovsky 230
static void handle_exception(int slot, istate_t *istate)
231
{
232
    ASSERT(breakpoints[slot].address);
233
 
234
    /* Handle zero checker */
235
    if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
236
        if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
1780 jermar 237
            if (*((unative_t *) breakpoints[slot].address) != 0)
1072 palkovsky 238
                return;
2441 decky 239
            printf("**** Found ZERO on address %lx (slot %d) ****\n",
240
                breakpoints[slot].address, slot);
1072 palkovsky 241
        } else {
2441 decky 242
            printf("Data watchpoint - new data: %lx\n",
1780 jermar 243
                   *((unative_t *) breakpoints[slot].address));
1072 palkovsky 244
        }
245
    }
2441 decky 246
    printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
1074 palkovsky 247
           get_symtab_entry(getip(istate)));
1072 palkovsky 248
    printf("***Type 'exit' to exit kconsole.\n");
249
    atomic_set(&haltstate,1);
2100 decky 250
    kconsole((void *) "debug");
1072 palkovsky 251
    atomic_set(&haltstate,0);
252
}
253
 
254
void breakpoint_del(int slot)
255
{
256
    bpinfo_t *cur;
257
    ipl_t ipl;
258
 
259
    ipl = interrupts_disable();
260
    spinlock_lock(&bkpoint_lock);
261
 
262
    cur = &breakpoints[slot];
263
    if (!cur->address) {
264
        spinlock_unlock(&bkpoint_lock);
265
        interrupts_restore(ipl);
266
        return;
267
    }
268
 
269
    cur->address = NULL;
270
 
1077 palkovsky 271
    setup_dr(slot);
1072 palkovsky 272
 
273
    spinlock_unlock(&bkpoint_lock);
274
    interrupts_restore(ipl);
1077 palkovsky 275
#ifdef CONFIG_SMP
276
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
277
#endif
1072 palkovsky 278
}
279
 
1077 palkovsky 280
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
281
 
1072 palkovsky 282
/** Remove breakpoint from table */
283
int cmd_del_breakpoint(cmd_arg_t *argv)
284
{
285
    if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
286
        printf("Invalid breakpoint number.\n");
287
        return 0;
288
    }
289
    breakpoint_del(argv->intval);
290
    return 1;
291
}
292
 
293
/** Add new breakpoint to table */
294
static int cmd_add_breakpoint(cmd_arg_t *argv)
295
{
296
    int flags;
1077 palkovsky 297
    int id;
1072 palkovsky 298
 
299
    if (argv == &add_argv) {
300
        flags = BKPOINT_INSTR;
301
    } else { /* addwatchp */
302
        flags = BKPOINT_WRITE;
303
    }
304
    printf("Adding breakpoint on address: %p\n", argv->intval);
1077 palkovsky 305
    id = breakpoint_add((void *)argv->intval, flags, -1);
306
    if (id < 0)
1072 palkovsky 307
        printf("Add breakpoint failed.\n");
1077 palkovsky 308
    else
309
        printf("Added breakpoint %d.\n", id);
1072 palkovsky 310
 
311
    return 1;
312
}
1077 palkovsky 313
#endif
1072 palkovsky 314
 
2441 decky 315
static void debug_exception(int n __attribute__((unused)), istate_t *istate)
1077 palkovsky 316
{
1780 jermar 317
    unative_t dr6;
1077 palkovsky 318
    int i;
319
 
320
    /* Set RF to restart the instruction  */
321
#ifdef amd64       
322
    istate->rflags |= RFLAGS_RF;
323
#else
324
    istate->eflags |= EFLAGS_RF;
325
#endif
326
 
327
    dr6 = read_dr6();
328
    for (i=0; i < BKPOINTS_MAX; i++) {
329
        if (dr6 & (1 << i)) {
330
            dr6 &= ~ (1 << i);
331
            write_dr6(dr6);
332
 
333
            handle_exception(i, istate);
334
        }
335
    }
336
}
337
 
338
#ifdef CONFIG_SMP
2441 decky 339
static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
1077 palkovsky 340
{
341
    int i;
342
 
343
    spinlock_lock(&bkpoint_lock);
2441 decky 344
    for (i = 0; i < BKPOINTS_MAX; i++)
1077 palkovsky 345
        setup_dr(i);
346
    spinlock_unlock(&bkpoint_lock);
347
}
348
#endif
349
 
1072 palkovsky 350
/** Initialize debugger */
351
void debugger_init()
352
{
353
    int i;
354
 
355
    for (i=0; i<BKPOINTS_MAX; i++)
356
        breakpoints[i].address = NULL;
357
 
358
    cmd_initialize(&bkpts_info);
359
    if (!cmd_register(&bkpts_info))
360
        panic("could not register command %s\n", bkpts_info.name);
361
 
1077 palkovsky 362
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
1072 palkovsky 363
    cmd_initialize(&delbkpt_info);
364
    if (!cmd_register(&delbkpt_info))
365
        panic("could not register command %s\n", delbkpt_info.name);
366
 
367
    cmd_initialize(&addbkpt_info);
368
    if (!cmd_register(&addbkpt_info))
369
        panic("could not register command %s\n", addbkpt_info.name);
370
 
371
    cmd_initialize(&addwatchp_info);
372
    if (!cmd_register(&addwatchp_info))
373
        panic("could not register command %s\n", addwatchp_info.name);
1077 palkovsky 374
#endif
1072 palkovsky 375
 
376
    exc_register(VECTOR_DEBUG, "debugger",
377
             debug_exception);
1077 palkovsky 378
#ifdef CONFIG_SMP
379
    exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
380
             debug_ipi);
381
#endif
1072 palkovsky 382
}
1702 cejka 383
 
1888 jermar 384
/** @}
1702 cejka 385
 */