Add U-mode test to functional test suite

The user mode validation test intentionally triggers an illegal
instruction exception to verify privilege isolation, which would normally
be classified as a test failure in the standard application test suite.
This test has been moved to the functional test suite where its expected
behavior can be properly validated.

The application test suite now excludes this test to avoid false
negatives. The functional test suite has been updated to recognize the
expected privilege violation as a valid success criterion alongside the
syscall mechanism validation. The crash detection logic now permits
expected exceptions for tests that intentionally verify security
boundaries.

Author: HeatCrab

.ci/run-app-tests.sh

@@ -47,7 +47,7 @@ else
 fi
 
 # Filter excluded apps
-EXCLUDED_APPS=""
+EXCLUDED_APPS="umode"
 if [ -n "$EXCLUDED_APPS" ]; then
     FILTERED_APPS=""
     for app in $APPS; do

.ci/run-functional-tests.sh

@@ -11,6 +11,7 @@ TOOLCHAIN_TYPE=${TOOLCHAIN_TYPE:-gnu}
 declare -A FUNCTIONAL_TESTS
 FUNCTIONAL_TESTS["mutex"]="Fairness: PASS,Mutual Exclusion: PASS,Data Consistency: PASS,Overall: PASS"
 FUNCTIONAL_TESTS["semaphore"]="Overall: PASS"
+FUNCTIONAL_TESTS["umode"]="PASS: sys_tid() returned,PASS: sys_uptime() returned,[EXCEPTION] Illegal instruction"
 #FUNCTIONAL_TESTS["test64"]="Unsigned Multiply: PASS,Unsigned Divide: PASS,Signed Multiply: PASS,Signed Divide: PASS,Left Shifts: PASS,Logical Right Shifts: PASS,Arithmetic Right Shifts: PASS,Overall: PASS"
 #FUNCTIONAL_TESTS["suspend"]="Suspend: PASS,Resume: PASS,Self-Suspend: PASS,Overall: PASS"
 
@@ -75,7 +76,8 @@ test_functional_app() {
     IFS=',' read -ra PASS_CRITERIA <<< "$expected_passes"
 
     # Check for crashes first
-    if echo "$output" | grep -qiE "(trap|exception|fault|panic|illegal|segfault)"; then
+    # Special case: umode test expects an illegal instruction exception
+    if [ "$test" != "umode" ] && echo "$output" | grep -qiE "(trap|exception|fault|panic|illegal|segfault)"; then
         echo "[!] Crash detected"
 
         # Mark all criteria as crashed