PUBLIC static inline
Mword
Jdb_bp::get_dr(Mword i)
{
switch (i)
{
case 0: return read_debug_register(0);
case 1: return read_debug_register(1);
case 2: return read_debug_register(2);
case 3: return read_debug_register(3);
case 6: return read_debug_register(6);
case 7: return dr7;
default: return 0;
}
}
IMPLEMENT
void
Jdb_bp::at_jdb_enter()
{
dr7 = read_debug_register(7);
// disable breakpoints while we are in kernel debugger
write_debug_register(7, dr7 & Val_enter);
}
/** @return 0 if only breakpoints were logged and jdb should not be entered */
IMPLEMENT
int
Jdb_bp::test_log_only()
{
Mword dr6 = read_debug_register(6);
if (dr6 & Val_test)
{
dr7 = read_debug_register(7);
// disable breakpoints -- we might trigger a r/w breakpoint again
write_debug_register(7, dr7 & Val_enter);
test_log(dr6);
write_debug_register(6, dr6);
write_debug_register(7, dr7);
if (!(dr6 & Val_test_other))
// don't enter jdb, breakpoints only logged
return 1;
}
// enter jdb
return 0;
}
/** @return 1 if other debug exception occured */
IMPLEMENT
int
Jdb_bp::test_other(String_buffer *buf)
{
Mword dr6 = read_debug_register(6);
if (!(dr6 & Val_test_other))
return 0;
buf->printf("unknown trap 1 (dr6=" L4_PTR_FMT ")", dr6);
write_debug_register(6, Val_leave);
return 1;
}
/** @return 1 if breakpoint occured */
IMPLEMENT
int
Jdb_bp::test_break(String_buffer *buf)
{
Mword dr6 = read_debug_register(6);
if (!(dr6 & Val_test))
return 0;
int ret = test_break(buf, dr6);
write_debug_register(6, dr6 & ~Val_test);
return ret;
}
/** @return 1 if single step occured */
IMPLEMENT
int
Jdb_bp::test_sstep()
{
Mword dr6 = read_debug_register(6);
if (!(dr6 & Val_test_sstep))
return 0;
// single step has highest priority, don't consider other conditions
write_debug_register(6, Val_leave);
return 1;
}
/** @return 1 if other debug exception occured */
IMPLEMENT
int
Jdb_bp::test_other(char *errbuf, size_t bufsize)
{
Mword dr6 = read_debug_register(6);
if (!(dr6 & Val_test_other))
return 0;
snprintf(errbuf, bufsize, "unknown trap 1 (dr6=" L4_PTR_FMT ")", dr6);
write_debug_register(6, Val_leave);
return 1;
}
/** @return 1 if breakpoint occured */
IMPLEMENT
int
Jdb_bp::test_break(char *errbuf, size_t bufsize)
{
Mword dr6 = read_debug_register(6);
if (!(dr6 & Val_test))
return 0;
int ret = test_break(dr6, errbuf, bufsize);
write_debug_register(6, dr6 & ~Val_test);
return ret;
}
/** @return 1 if breakpoint occured */
IMPLEMENT
int
Jdb_bp::test_break(char *errbuf, size_t bufsize)
{
Space *t = Jdb::get_thread(0)->space();
Mword dr6 = read_debug_register(6, t);
if (!(dr6 & 0x000000f))
return 0;
test_break(dr6, errbuf, bufsize);
write_debug_register(6, dr6 & ~0x0000000f, t);
return 1;
}
IMPLEMENT
int
Jdb_bp::test_log_only()
{
Space *t = Jdb::get_thread(0)->space();
Mword dr6 = read_debug_register(6, t);
if (dr6 & 0x0000000f)
{
test_log(dr6);
write_debug_register(6, dr6, t);
if (!(dr6 & 0x0000e00f))
// don't enter jdb, breakpoints only logged
return 1;
}
// enter jdb
return 0;
}
PUBLIC static inline
Mword
Jdb_bp::get_debug_control_register(Space *task)
{
return read_debug_register(7, task);
}
