[kernel] Add thread flag to exit thread on panic

If panic is called from a thread after
thread_set_flag_exit_on_panic(thread, true) has been called for that
thread. The thread will exit with ERR_FAULT as the return code instead
of halting the system. This can be used to test error paths that are
normally not testable, e.g. exception handling.

Bug: 147698516
Change-Id: I455898d8d3b5b3ee005969893bb4cb09d4b88a48

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/debug/debug.c b/lib/debug/debug.c
index 847074d5..54a2612d 100644
--- a/lib/debug/debug.c
+++ b/lib/debug/debug.c
@@ -23,6 +23,7 @@
 
 #include <ctype.h>
 #include <debug.h>
+#include <err.h>
 #include <stdlib.h>
 #include <printf.h>
 #include <stdio.h>
@@ -31,6 +32,7 @@
 #include <platform.h>
 #include <platform/debug.h>
 #include <kernel/spinlock.h>
+#include <kernel/thread.h>
 
 void spin(uint32_t usecs)
 {
@@ -48,6 +50,12 @@ void spin(uint32_t usecs)
 void _panic(const char *fmt, ...)
 {
     va_list ap;
+    struct thread *curr = get_current_thread();
+
+    if (curr && thread_get_flag_exit_on_panic(curr)) {
+        thread_exit(ERR_FAULT);
+    }
+
     va_start(ap, fmt);
     vprintf(fmt, ap);
     va_end(ap);