void
db_set_breakpoint(
task_t task,
db_addr_t addr,
int count,
thread_act_t thr_act,
boolean_t task_bpt)
{
register db_breakpoint_t bkpt;
db_breakpoint_t alloc_bkpt = 0;
vm_offset_t task_thd;
bkpt = db_find_breakpoint(task, addr);
if (bkpt) {
if (thr_act == THR_ACT_NULL
|| db_find_thread_breakpoint(bkpt, thr_act)) {
db_printf("Already set.\n");
return;
}
} else {
if (!DB_CHECK_ACCESS(addr, BKPT_SIZE, task)) {
if (task) {
db_printf("Warning: non-resident page for breakpoint at %lX",
addr);
db_printf(" in task %lX.\n", task);
} else {
db_printf("Cannot set breakpoint at %lX in kernel space.\n",
addr);
return;
}
}
alloc_bkpt = bkpt = db_breakpoint_alloc();
if (bkpt == 0) {
db_printf("Too many breakpoints.\n");
return;
}
bkpt->task = task;
bkpt->flags = (task && thr_act == THR_ACT_NULL)?
(BKPT_USR_GLOBAL|BKPT_1ST_SET): 0;
bkpt->address = addr;
bkpt->threads = 0;
}
if (db_breakpoint_list == 0)
db_breakpoint_number = 0;
task_thd = (task_bpt) ? (vm_offset_t)(thr_act->task)
: (vm_offset_t)thr_act;
if (db_add_thread_breakpoint(bkpt, task_thd, count, task_bpt) < 0) {
if (alloc_bkpt)
db_breakpoint_free(alloc_bkpt);
db_printf("Too many thread_breakpoints.\n");
} else {
db_printf("set breakpoint #%x\n", db_breakpoint_number);
if (alloc_bkpt) {
bkpt->link = db_breakpoint_list;
db_breakpoint_list = bkpt;
}
}
}
int
db_xcdump(
db_addr_t addr,
int size,
int count,
task_t task)
{
register int i, n;
db_expr_t value;
int bcount;
db_addr_t off;
char *name;
char data[DB_XCDUMP_NC];
db_find_task_sym_and_offset(addr, &name, &off, task);
for (n = count*size; n > 0; n -= bcount) {
db_prev = addr;
if (off == 0) {
db_printf("%s:\n", name);
off = -1;
}
db_printf("%0*X:%s", 2*sizeof(db_addr_t), addr,
(size != 1) ? " " : "" );
bcount = ((n > DB_XCDUMP_NC)? DB_XCDUMP_NC: n);
if (trunc_page(addr) != trunc_page(addr+bcount-1)) {
db_addr_t next_page_addr = trunc_page(addr+bcount-1);
if (!DB_CHECK_ACCESS(next_page_addr, sizeof(int), task))
bcount = next_page_addr - addr;
}
db_read_bytes((vm_offset_t)addr, bcount, data, task);
for (i = 0; i < bcount && off != 0; i += size) {
if (i % 4 == 0)
db_printf(" ");
value = db_get_task_value(addr, size, FALSE, task);
db_printf("%0*x ", size*2, value);
addr += size;
db_find_task_sym_and_offset(addr, &name, &off, task);
}
db_printf("%*s",
((DB_XCDUMP_NC-i)/size)*(size*2+1)+(DB_XCDUMP_NC-i)/4,
"");
bcount = i;
db_printf("%s*", (size != 1)? " ": "");
for (i = 0; i < bcount; i++) {
value = data[i];
db_printf("%c", (value >= ' ' && value <= '~')? value: '.');
}
db_printf("*\n");
}
return(addr);
}
void
db_clear_breakpoints(void)
{
register db_breakpoint_t bkpt, *bkptp;
register task_t task;
db_expr_t inst;
thread_act_t cur_act = current_act();
task_t cur_task = (cur_act && !cur_act->kernel_loaded) ?
cur_act->task: TASK_NULL;
if (db_breakpoints_inserted) {
bkptp = &db_breakpoint_list;
for (bkpt = *bkptp; bkpt; bkpt = *bkptp) {
task = bkpt->task;
if (bkpt->flags & BKPT_USR_GLOBAL) {
if (cur_task == TASK_NULL) {
bkptp = &bkpt->link;
continue;
}
task = cur_task;
}
if ((bkpt->flags & BKPT_SET_IN_MEM)
&& DB_CHECK_ACCESS(bkpt->address, BKPT_SIZE, task)) {
inst = db_get_task_value(bkpt->address, BKPT_SIZE, FALSE,
task);
if (inst != BKPT_SET(inst)) {
if (bkpt->flags & BKPT_USR_GLOBAL) {
bkptp = &bkpt->link;
continue;
}
db_force_delete_breakpoint(bkpt, 0, FALSE);
*bkptp = bkpt->link;
db_breakpoint_free(bkpt);
continue;
}
db_put_task_value(bkpt->address, BKPT_SIZE,
bkpt->bkpt_inst, task);
bkpt->flags &= ~BKPT_SET_IN_MEM;
}
bkptp = &bkpt->link;
}
db_breakpoints_inserted = FALSE;
}
}
void
db_set_breakpoints(void)
{
register db_breakpoint_t bkpt;
register task_t task;
db_expr_t inst;
thread_act_t cur_act = current_act();
task_t cur_task =
(cur_act && !cur_act->kernel_loaded) ?
cur_act->task : TASK_NULL;
boolean_t inserted = TRUE;
if (!db_breakpoints_inserted) {
for (bkpt = db_breakpoint_list; bkpt != 0; bkpt = bkpt->link) {
if (bkpt->flags & BKPT_SET_IN_MEM)
continue;
task = bkpt->task;
if (bkpt->flags & BKPT_USR_GLOBAL) {
if ((bkpt->flags & BKPT_1ST_SET) == 0) {
if (cur_task == TASK_NULL)
continue;
task = cur_task;
} else
bkpt->flags &= ~BKPT_1ST_SET;
}
if (DB_CHECK_ACCESS(bkpt->address, BKPT_SIZE, task)) {
inst = db_get_task_value(bkpt->address, BKPT_SIZE, FALSE,
task);
if (inst == BKPT_SET(inst))
continue;
bkpt->bkpt_inst = inst;
db_put_task_value(bkpt->address,
BKPT_SIZE,
BKPT_SET(bkpt->bkpt_inst), task);
bkpt->flags |= BKPT_SET_IN_MEM;
} else {
inserted = FALSE;
}
}
db_breakpoints_inserted = inserted;
}
}
int
db_numargs(
struct i386_frame *fp,
task_t task)
{
long *argp;
long inst;
long args;
extern char etext[];
argp = (long *)db_get_task_value((long)&fp->f_retaddr, sizeof(long), FALSE, task);
if (argp < (long *)VM_MIN_KERNEL_ADDRESS || argp > (long *)etext)
args = db_numargs_default;
else if (!DB_CHECK_ACCESS((long)argp, sizeof(long), task))
args = db_numargs_default;
else {
inst = db_get_task_value((long)argp, sizeof(long), FALSE, task);
if ((inst & 0xff) == 0x59) /* popl %ecx */
args = 1;
else if ((inst & 0xffff) == 0xc483) /* addl %n, %esp */
args = ((inst >> 16) & 0xff) / 4;
else
args = db_numargs_default;
}