abgabe

kernel/syscall/handler.asm

@@ -20,7 +20,9 @@ syscall_entry:
 	cld
 
 	; Call the high-level (C++) system call handler
+    sti
 	call syscall_handler
+    cli
 
 	; Optional: Prevent kernel information leakage
 	; by zeroing scratch registers

kernel/syscall/handler.cc

@@ -36,6 +36,8 @@ namespace Syscall {
  * instruction pointer)
  * \return system call return value
  */
+
+
 extern "C" size_t syscall_handler(size_t sysnum, size_t p1, size_t p2,
 								  size_t p3, size_t p4, size_t p5,
 								  InterruptContext *user) {

kernel/syscall/skeleton.cc

@@ -68,6 +68,7 @@ size_t read(Vault &vault, uint32_t id, void *buf, size_t len) {
     size_t read_cnt = 0;
     while(read_cnt <= len){
         Key key;
+        vault.keys_sem.p(vault);
         vault.keys.consume(key);
         if(key.valid())
             ((char*)buf)[read_cnt++] = key.ascii();