SYSCALL naked assembly working

[cortex-from-scratch] / lib / syscall.c

diff --git a/lib/syscall.c b/lib/syscall.c
new file mode 100644 (file)
index 0000000..106c235
--- /dev/null
+++ b/lib/syscall.c
@@ -0,0 +1,38 @@
+
+/* (CC-BY-NC-SA) ROBIN KRENS - ROBIN @ ROBINKRENS.NL
+ * 
+ * $LOG$
+ * 2019/9/21 - ROBIN KRENS     
+ * Initial version 
+ * 
+ * $DESCRIPTION$
+ * System calls for user functions
+ *
+ */
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <lib/syscall.h>
+
+
+//__attribute__ ((naked))
+static int theos_syscall(int SYSCALL_N, int SYSCALL_N2) {
+
+       asm volatile ("svc 11");
+       
+       return 0;
+}
+
+//__attribute__ ((naked))
+void theos_test(int dummy, int dummy2) {
+
+       theos_syscall(0xB1, 0xB2);
+}
+
+/* void theos_cputs(const char * str, size_t len) {
+
+       //syscall(#, 0, 0, 0 ..);
+       theos_syscall(22, 44);
+} */