thermosphere: add hypercall support... even if unused

thermosphere/src/exceptions.c

@@ -14,10 +14,10 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "exceptions.h"
+#include "hvc.h"
 #include "log.h"
 
-static void dumpStackFrame(const ExceptionStackFrame *frame, bool sameEl)
+void dumpStackFrame(const ExceptionStackFrame *frame, bool sameEl)
 {
 #ifndef NDEBUG
     for (u32 i = 0; i < 30; i += 2) {
@@ -38,8 +38,17 @@ static void dumpStackFrame(const ExceptionStackFrame *frame, bool sameEl)
 
 void handleLowerElSyncException(ExceptionStackFrame *frame, ExceptionSyndromeRegister esr)
 {
-    serialLog("Lower EL sync exception, EC = 0x%02llx IL=%llu ISS=0x%06llx\r\n", (u64)esr.ec, esr.il, esr.iss);
+
-    dumpStackFrame(frame, false);
+    switch (esr.ec) {
+        case Exception_HypervisorCallA64:
+        case Exception_HypervisorCallA32:
+            handleHypercall(frame, esr);
+            break;
+        default:
+            serialLog("Lower EL sync exception, EC = 0x%02llx IL=%llu ISS=0x%06llx\r\n", (u64)esr.ec, esr.il, esr.iss);
+            dumpStackFrame(frame, false);
+            break;
+    }
 }
 
 void handleSameElSyncException(ExceptionStackFrame *frame, ExceptionSyndromeRegister esr)

thermosphere/src/exceptions.h

@@ -78,3 +78,5 @@ typedef struct ExceptionSyndromeRegister {
     ExceptionClass ec   :  6;   // Exception Class
     u32 res0            : 32;
 } ExceptionSyndromeRegister;
+
+void dumpStackFrame(const ExceptionStackFrame *frame, bool sameEl);

thermosphere/src/hvc.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hvc.h"
+#include "log.h"
+
+void handleHypercall(ExceptionStackFrame *frame, ExceptionSyndromeRegister esr)
+{
+    u32 id = esr.iss;
+    switch (id) {
+        default:
+            serialLog("Unhandled hypercall: 0x%x.\r\n");
+            dumpStackFrame(frame, false);
+            break;
+    }
+}

thermosphere/src/hvc.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include "exceptions.h"
+
+void handleHypercall(ExceptionStackFrame *frame, ExceptionSyndromeRegister esr);

thermosphere/src/utils.h

@@ -105,3 +105,7 @@ static inline u32 get_spsr(void) {
 static inline bool check_32bit_additive_overflow(u32 a, u32 b) {
     return __builtin_add_overflow_p(a, b, (u32)0);
 }
+
+static inline void panic(void) {
+    for (;;);
+}