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libdebugger: Add a target break call to suspend all running threads

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- Optionally wait if there is no remote debugger connected and break
  when the remote connects

Closes #4740
This commit is contained in:
Chris Johns
2022-10-17 16:25:57 +11:00
parent 1d2fab8a79
commit d574e08663
3 changed files with 65 additions and 16 deletions
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1
cpukit/include/rtems/debugger/rtems-debugger-server.h
View File

@@ -103,6 +103,7 @@ extern "C" {
#define RTEMS_DEBUGGER_FLAG_MULTIPROCESS (1 << 4)
#define RTEMS_DEBUGGER_FLAG_VERBOSE_LOCK (1 << 5)
#define RTEMS_DEBUGGER_FLAG_VERBOSE_CMDS (1 << 6)
#define RTEMS_DEBUGGER_FLAG_BREAK_WAITER (1 << 7)
/**
* Forward decl for the threads and targets.

8
cpukit/include/rtems/rtems-debugger.h
View File

@@ -53,6 +53,14 @@ extern int rtems_debugger_start(const char* remote,
rtems_task_priority priority,
const rtems_printer* printer);
/**
* Suspend all running threads including the caller if not
* excluded. Returns when the debugger has connected and continued.
*
* If wait is true and there is no remote connected wait then break.
*/
extern int rtems_debugger_break(bool wait);
/**
* Stop the Debugger.
*/

72
cpukit/libdebugger/rtems-debugger-server.c
View File

@@ -1678,18 +1678,30 @@ rtems_debugger_events(rtems_task_argument arg)
rtems_debugger_target_enable();
while (rtems_debugger_server_events_running()) {
rtems_debugger_server_events_wait();
if (rtems_debugger_verbose())
rtems_debugger_printf("rtems-db: event woken\n");
if (!rtems_debugger_server_events_running())
break;
if (rtems_debugger_server_flag(RTEMS_DEBUGGER_FLAG_BREAK_WAITER)) {
rtems_debugger->flags &= ~RTEMS_DEBUGGER_FLAG_BREAK_WAITER;
r = rtems_debugger_thread_system_suspend();
if (r < 0)
break;
r = remote_stop_reason(NULL, 0);
if (r < 0)
break;
if (rtems_debugger_verbose())
rtems_debugger_printf("rtems-db: break waiter\n");
rtems_debugger_server_events_signal();
if (rtems_debugger_verbose())
rtems_debugger_printf("rtems-db: break waiter: signalled\n");
}
if (r == 0) {
while (rtems_debugger_server_events_running()) {
rtems_debugger_server_events_wait();
if (rtems_debugger_verbose())
rtems_debugger_printf("rtems-db: event woken\n");
if (!rtems_debugger_server_events_running())
break;
r = rtems_debugger_thread_system_suspend();
if (r < 0)
break;
r = remote_stop_reason(NULL, 0);
if (r < 0)
break;
}
}
if (r < 0)
@@ -1972,6 +1984,30 @@ rtems_debugger_server_crash(void)
rtems_debugger->remote->end(rtems_debugger->remote);
}
int
rtems_debugger_break(bool wait)
{
int r = 0;
if (!rtems_debugger_running()) {
errno = EIO;
r = -1;
} else {
rtems_debugger_lock();
if (rtems_debugger_server_events_running()) {
rtems_debugger_server_events_signal();
} else if (
wait && !rtems_debugger_server_flag(RTEMS_DEBUGGER_FLAG_BREAK_WAITER)) {
rtems_debugger->flags |= RTEMS_DEBUGGER_FLAG_BREAK_WAITER;
rtems_debugger_server_events_wait();
} else {
errno = EIO;
r = -1;
}
rtems_debugger_unlock();
}
return r;
}
int
rtems_debugger_stop(void)
{
@@ -1998,10 +2034,14 @@ rtems_debugger_set_verbose(bool on)
int
rtems_debugger_remote_debug(bool state)
{
rtems_debugger_lock();
rtems_debugger->remote_debug = state;
rtems_debugger_printf("rtems-db: remote-debug is %s\n",
rtems_debugger->remote_debug ? "on" : "off");
rtems_debugger_unlock();
if (rtems_debugger_running()) {
rtems_debugger_lock();
rtems_debugger->remote_debug = state;
rtems_debugger_printf("rtems-db: remote-debug is %s\n",
rtems_debugger->remote_debug ? "on" : "off");
rtems_debugger_unlock();
} else {
rtems_debugger_printf("rtems-db: debug server not running\n");
}
return 0;
}