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/*
* Copyright (c) 2006 Ondrej Palkovsky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup amd64debug
* @{
*/
/** @file
*/
#include <arch/debugger.h>
#include <console/kconsole.h>
#include <console/cmd.h>
#include <symtab.h>
#include <print.h>
#include <panic.h>
#include <interrupt.h>
#include <arch/asm.h>
#include <arch/cpu.h>
#include <debug.h>
#include <func.h>
#include <smp/ipi.h>
typedef struct {
uintptr_t address; /**< Breakpoint address */
int flags; /**< Flags regarding breakpoint */
int counter; /**< How many times the exception occured */
} bpinfo_t;
static bpinfo_t breakpoints[BKPOINTS_MAX];
SPINLOCK_INITIALIZE(bkpoint_lock);
static int cmd_print_breakpoints(cmd_arg_t *argv);
static cmd_info_t bkpts_info = {
.name = "bkpts",
.description = "Print breakpoint table.",
.func = cmd_print_breakpoints,
.argc = 0,
};
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
static int cmd_del_breakpoint(cmd_arg_t *argv);
static cmd_arg_t del_argv = {
.type = ARG_TYPE_INT
};
static cmd_info_t delbkpt_info = {
.name = "delbkpt",
.description = "delbkpt <number> - Delete breakpoint.",
.func = cmd_del_breakpoint,
.argc = 1,
.argv = &del_argv
};
static int cmd_add_breakpoint(cmd_arg_t *argv);
static cmd_arg_t add_argv = {
.type = ARG_TYPE_INT
};
static cmd_info_t addbkpt_info = {
.name = "addbkpt",
.description = "addbkpt <&symbol> - new breakpoint.",
.func = cmd_add_breakpoint,
.argc = 1,
.argv = &add_argv
};
static cmd_arg_t addw_argv = {
.type = ARG_TYPE_INT
};
static cmd_info_t addwatchp_info = {
.name = "addwatchp",
.description = "addbwatchp <&symbol> - new write watchpoint.",
.func = cmd_add_breakpoint,
.argc = 1,
.argv = &addw_argv
};
#endif
/** Print table of active breakpoints */
int cmd_print_breakpoints(cmd_arg_t *argv)
{
int i;
char *symbol;
printf("Breakpoint table.\n");
for (i=0; i < BKPOINTS_MAX; i++)
if (breakpoints[i].address) {
symbol = get_symtab_entry(breakpoints[i].address);
printf("%d. %p in %s\n",i,
breakpoints[i].address, symbol);
printf(" Count(%d) ", breakpoints[i].counter);
printf("\n");
}
return 1;
}
/* Setup DR register according to table */
static void setup_dr(int curidx)
{
unative_t dr7;
bpinfo_t *cur = &breakpoints[curidx];
int flags = breakpoints[curidx].flags;
/* Disable breakpoint in DR7 */
dr7 = read_dr7();
dr7 &= ~(0x2 << (curidx*2));
if (cur->address) { /* Setup DR register */
/* Set breakpoint to debug registers */
switch (curidx) {
case 0:
write_dr0(cur->address);
break;
case 1:
write_dr1(cur->address);
break;
case 2:
write_dr2(cur->address);
break;
case 3:
write_dr3(cur->address);
break;
}
/* Set type to requested breakpoint & length*/
dr7 &= ~ (0x3 << (16 + 4*curidx));
dr7 &= ~ (0x3 << (18 + 4*curidx));
if ((flags & BKPOINT_INSTR)) {
;
} else {
if (sizeof(int) == 4)
dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
else /* 8 */
dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
if ((flags & BKPOINT_WRITE))
dr7 |= ((unative_t) 0x1) << (16 + 4*curidx);
else if ((flags & BKPOINT_READ_WRITE))
dr7 |= ((unative_t) 0x3) << (16 + 4*curidx);
}
/* Enable global breakpoint */
dr7 |= 0x2 << (curidx*2);
write_dr7(dr7);
}
}
/** Enable hardware breakpoint
*
*
* @param where Address of HW breakpoint
* @param flags Type of breakpoint (EXECUTE, WRITE)
* @return Debug slot on success, -1 - no available HW breakpoint
*/
int breakpoint_add(void * where, int flags, int curidx)
{
ipl_t ipl;
int i;
bpinfo_t *cur;
ASSERT( flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
ipl = interrupts_disable();
spinlock_lock(&bkpoint_lock);
if (curidx == -1) {
/* Find free space in slots */
for (i=0; i<BKPOINTS_MAX; i++)
if (!breakpoints[i].address) {
curidx = i;
break;
}
if (curidx == -1) {
/* Too many breakpoints */
spinlock_unlock(&bkpoint_lock);
interrupts_restore(ipl);
return -1;
}
}
cur = &breakpoints[curidx];
cur->address = (uintptr_t) where;
cur->flags = flags;
cur->counter = 0;
setup_dr(curidx);
spinlock_unlock(&bkpoint_lock);
interrupts_restore(ipl);
/* Send IPI */
#ifdef CONFIG_SMP
// ipi_broadcast(VECTOR_DEBUG_IPI);
#endif
return curidx;
}
#ifdef amd64
# define getip(x) ((x)->rip)
#else
# define getip(x) ((x)->eip)
#endif
static void handle_exception(int slot, istate_t *istate)
{
ASSERT(breakpoints[slot].address);
/* Handle zero checker */
if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
if (*((unative_t *) breakpoints[slot].address) != 0)
return;
printf("**** Found ZERO on address %p ****\n",
slot, breakpoints[slot].address);
} else {
printf("Data watchpoint - new data: %p\n",
*((unative_t *) breakpoints[slot].address));
}
}
printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),
get_symtab_entry(getip(istate)));
printf("***Type 'exit' to exit kconsole.\n");
atomic_set(&haltstate,1);
kconsole((void *) "debug");
atomic_set(&haltstate,0);
}
void breakpoint_del(int slot)
{
bpinfo_t *cur;
ipl_t ipl;
ipl = interrupts_disable();
spinlock_lock(&bkpoint_lock);
cur = &breakpoints[slot];
if (!cur->address) {
spinlock_unlock(&bkpoint_lock);
interrupts_restore(ipl);
return;
}
cur->address = NULL;
setup_dr(slot);
spinlock_unlock(&bkpoint_lock);
interrupts_restore(ipl);
#ifdef CONFIG_SMP
// ipi_broadcast(VECTOR_DEBUG_IPI);
#endif
}
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
/** Remove breakpoint from table */
int cmd_del_breakpoint(cmd_arg_t *argv)
{
if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
printf("Invalid breakpoint number.\n");
return 0;
}
breakpoint_del(argv->intval);
return 1;
}
/** Add new breakpoint to table */
static int cmd_add_breakpoint(cmd_arg_t *argv)
{
int flags;
int id;
if (argv == &add_argv) {
flags = BKPOINT_INSTR;
} else { /* addwatchp */
flags = BKPOINT_WRITE;
}
printf("Adding breakpoint on address: %p\n", argv->intval);
id = breakpoint_add((void *)argv->intval, flags, -1);
if (id < 0)
printf("Add breakpoint failed.\n");
else
printf("Added breakpoint %d.\n", id);
return 1;
}
#endif
static void debug_exception(int n, istate_t *istate)
{
unative_t dr6;
int i;
/* Set RF to restart the instruction */
#ifdef amd64
istate->rflags |= RFLAGS_RF;
#else
istate->eflags |= EFLAGS_RF;
#endif
dr6 = read_dr6();
for (i=0; i < BKPOINTS_MAX; i++) {
if (dr6 & (1 << i)) {
dr6 &= ~ (1 << i);
write_dr6(dr6);
handle_exception(i, istate);
}
}
}
#ifdef CONFIG_SMP
static void debug_ipi(int n, istate_t *istate)
{
int i;
spinlock_lock(&bkpoint_lock);
for (i=0; i < BKPOINTS_MAX; i++)
setup_dr(i);
spinlock_unlock(&bkpoint_lock);
}
#endif
/** Initialize debugger */
void debugger_init()
{
int i;
for (i=0; i<BKPOINTS_MAX; i++)
breakpoints[i].address = NULL;
cmd_initialize(&bkpts_info);
if (!cmd_register(&bkpts_info))
panic("could not register command %s\n", bkpts_info.name);
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
cmd_initialize(&delbkpt_info);
if (!cmd_register(&delbkpt_info))
panic("could not register command %s\n", delbkpt_info.name);
cmd_initialize(&addbkpt_info);
if (!cmd_register(&addbkpt_info))
panic("could not register command %s\n", addbkpt_info.name);
cmd_initialize(&addwatchp_info);
if (!cmd_register(&addwatchp_info))
panic("could not register command %s\n", addwatchp_info.name);
#endif
exc_register(VECTOR_DEBUG, "debugger",
debug_exception);
#ifdef CONFIG_SMP
exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
debug_ipi);
#endif
}
/** @}
*/