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1072 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - 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
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * 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
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/debugger.h>
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#include <console/kconsole.h>
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#include <console/cmd.h>
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#include <symtab.h>
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#include <print.h>
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#include <panic.h>
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#include <interrupt.h>
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#include <arch/asm.h>
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#include <arch/cpu.h>
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#include <debug.h>
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#include <func.h>
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typedef struct  {
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    __address address;      /**< Breakpoint address */
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    int flags;              /**< Flags regarding breakpoint */
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    int counter;            /**< How many times the exception occured */
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} bpinfo_t;
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static bpinfo_t breakpoints[BKPOINTS_MAX];
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SPINLOCK_INITIALIZE(bkpoint_lock);
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static int cmd_print_breakpoints(cmd_arg_t *argv);
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static cmd_info_t bkpts_info = {
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    .name = "bkpts",
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    .description = "Print breakpoint table.",
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    .func = cmd_print_breakpoints,
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    .argc = 0,
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};
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static int cmd_del_breakpoint(cmd_arg_t *argv);
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static cmd_arg_t del_argv = {
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    .type = ARG_TYPE_INT
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};
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static cmd_info_t delbkpt_info = {
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    .name = "delbkpt",
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    .description = "delbkpt <number> - Delete breakpoint.",
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    .func = cmd_del_breakpoint,
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    .argc = 1,
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    .argv = &del_argv
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};
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static int cmd_add_breakpoint(cmd_arg_t *argv);
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static cmd_arg_t add_argv = {
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    .type = ARG_TYPE_INT
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};
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static cmd_info_t addbkpt_info = {
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    .name = "addbkpt",
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    .description = "addbkpt <&symbol> - new breakpoint.",
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    .func = cmd_add_breakpoint,
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    .argc = 1,
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    .argv = &add_argv
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};
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static cmd_arg_t addw_argv = {
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    .type = ARG_TYPE_INT
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};
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static cmd_info_t addwatchp_info = {
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    .name = "addwatchp",
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    .description = "addbwatchp <&symbol> - new write watchpoint.",
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    .func = cmd_add_breakpoint,
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    .argc = 1,
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    .argv = &addw_argv
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};
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/** Print table of active breakpoints */
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int cmd_print_breakpoints(cmd_arg_t *argv)
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{
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    int i;
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    char *symbol;
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    printf("Breakpoint table.\n");
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    for (i=0; i < BKPOINTS_MAX; i++)
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        if (breakpoints[i].address) {
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            symbol = get_symtab_entry(breakpoints[i].address);
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            printf("%d. 0x%p in %s\n",i,
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                   breakpoints[i].address, symbol);
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            printf("     Count(%d) ", breakpoints[i].counter);
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            printf("\n");
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        }
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    return 1;
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}
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/** Enable hardware breakpoint
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 *
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 *
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 * @param where Address of HW breakpoint
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 * @param flags Type of breakpoint (EXECUTE, WRITE)
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 * @return Debug slot on success, -1 - no available HW breakpoint
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 */
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int breakpoint_add(void * where, int flags)
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{
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    bpinfo_t *cur = NULL;
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    int curidx;
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    ipl_t ipl;
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    int i;
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    __native dr7;
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    ASSERT( flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
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    ipl = interrupts_disable();
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    spinlock_lock(&bkpoint_lock);
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    /* Find free space in slots */
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    for (i=0; i<BKPOINTS_MAX; i++)
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        if (!breakpoints[i].address) {
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            cur = &breakpoints[i];
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            curidx = i;
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            break;
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        }
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    if (!cur) {
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        /* Too many breakpoints */
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        spinlock_unlock(&bkpoint_lock);
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        interrupts_restore(ipl);
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        return -1;
144
    }
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    cur->address = (__address) where;
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    cur->flags = flags;
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    cur->counter = 0;
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    /* Set breakpoint to debug registers */
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    switch (curidx) {
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    case 0:
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        write_dr0(cur->address);
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        break;
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    case 1:
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        write_dr1(cur->address);
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        break;
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    case 2:
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        write_dr2(cur->address);
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        break;
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    case 3:
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        write_dr3(cur->address);
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        break;
163
    }
164
    dr7 = read_dr7();
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    /* Set type to requested breakpoint & length*/
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    dr7 &= ~ (0x3 << (16 + 4*curidx));
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    dr7 &= ~ (0x3 << (18 + 4*curidx));
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    if ((flags & BKPOINT_INSTR)) {
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        printf("Instr breakpoint\n");
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        ;
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    } else {
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        if (sizeof(int) == 4)
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            dr7 |= 0x3 << (18 + 4*curidx);
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        else /* 8 */
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            dr7 |= 0x2 << (18 + 4*curidx);
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        if ((flags & BKPOINT_WRITE))
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            dr7 |= 0x1 << (16 + 4*curidx);
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        else if ((flags & BKPOINT_READ_WRITE))
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            dr7 |= 0x3 << (16 + 4*curidx);
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    }
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    /* Enable global breakpoint */
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    dr7 |= 0x2 << (curidx*2);
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186
    write_dr7(dr7);
187
 
188
    spinlock_unlock(&bkpoint_lock);
189
    interrupts_restore(ipl);
190
 
191
    return curidx;
192
}
193
 
194
static void handle_exception(int slot, istate_t *istate)
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{
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    ASSERT(breakpoints[slot].address);
197
 
198
    /* Handle zero checker */
199
    if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
200
        if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
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            if (*((__native *) breakpoints[slot].address) != 0)
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                return;
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            printf("**** Found ZERO on address %P ****\n",
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                   slot, breakpoints[slot].address);
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        } else {
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            printf("Data watchpoint - new data: %P\n",
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                   *((__native *) breakpoints[slot].address));
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        }
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    }
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    printf("Reached breakpoint %d:%P(%s)\n", slot, istate->rip,
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           get_symtab_entry(istate->rip));
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    printf("***Type 'exit' to exit kconsole.\n");
213
    atomic_set(&haltstate,1);
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    kconsole("debug");
215
    atomic_set(&haltstate,0);
216
}
217
 
218
static void debug_exception(int n, istate_t *istate)
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{
220
    __native dr6;
221
    int i;
222
 
223
    /* Set RF to restart the instruction  */
224
    istate->rflags |= RFLAGS_RF;
225
 
226
    dr6 = read_dr6();
227
    for (i=0; i < BKPOINTS_MAX; i++) {
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        if (dr6 & (1 << i)) {
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            dr6 &= ~ (1 << i);
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            write_dr6(dr6);
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232
            handle_exception(i, istate);
233
        }
234
    }
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}
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void breakpoint_del(int slot)
238
{
239
    bpinfo_t *cur;
240
    ipl_t ipl;
241
    __native dr7;
242
 
243
    ipl = interrupts_disable();
244
    spinlock_lock(&bkpoint_lock);
245
 
246
    cur = &breakpoints[slot];
247
    if (!cur->address) {
248
        spinlock_unlock(&bkpoint_lock);
249
        interrupts_restore(ipl);
250
        return;
251
    }
252
 
253
    cur->address = NULL;
254
 
255
    /* Disable breakpoint in DR7 */
256
    dr7 = read_dr7();
257
    dr7 &= ~(0x2 << (slot*2));
258
    write_dr7(dr7);
259
 
260
    spinlock_unlock(&bkpoint_lock);
261
    interrupts_restore(ipl);
262
}
263
 
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/** Remove breakpoint from table */
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int cmd_del_breakpoint(cmd_arg_t *argv)
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{
267
    if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
268
        printf("Invalid breakpoint number.\n");
269
        return 0;
270
    }
271
    breakpoint_del(argv->intval);
272
    return 1;
273
}
274
 
275
/** Add new breakpoint to table */
276
static int cmd_add_breakpoint(cmd_arg_t *argv)
277
{
278
    int flags;
279
 
280
    if (argv == &add_argv) {
281
        flags = BKPOINT_INSTR;
282
    } else { /* addwatchp */
283
        flags = BKPOINT_WRITE;
284
    }
285
    printf("Adding breakpoint on address: %p\n", argv->intval);
286
    if (breakpoint_add((void *)argv->intval, flags))
287
        printf("Add breakpoint failed.\n");
288
 
289
    return 1;
290
}
291
 
292
/** Initialize debugger */
293
void debugger_init()
294
{
295
    int i;
296
 
297
    for (i=0; i<BKPOINTS_MAX; i++)
298
        breakpoints[i].address = NULL;
299
 
300
    cmd_initialize(&bkpts_info);
301
    if (!cmd_register(&bkpts_info))
302
        panic("could not register command %s\n", bkpts_info.name);
303
 
304
    cmd_initialize(&delbkpt_info);
305
    if (!cmd_register(&delbkpt_info))
306
        panic("could not register command %s\n", delbkpt_info.name);
307
 
308
    cmd_initialize(&addbkpt_info);
309
    if (!cmd_register(&addbkpt_info))
310
        panic("could not register command %s\n", addbkpt_info.name);
311
 
312
    cmd_initialize(&addwatchp_info);
313
    if (!cmd_register(&addwatchp_info))
314
        panic("could not register command %s\n", addwatchp_info.name);
315
 
316
    exc_register(VECTOR_DEBUG, "debugger",
317
             debug_exception);
318
}