part of Issue#994

mcexec: open syscall moves to arch_dep
do_fork: don't use __NR_fork. use __NR_clone
vfork: moves to arch_dep

arch/arm64/kernel/include/syscall_list.h

@@ -144,5 +144,3 @@ SYSCALL_HANDLED(1045, signalfd)
 SYSCALL_DELEGATED(1049, stat)
 SYSCALL_DELEGATED(1060, getpgrp)
 SYSCALL_DELEGATED(1062, time)
-SYSCALL_HANDLED(1071, vfork)
-SYSCALL_DELEGATED(1079, fork)

arch/x86_64/kernel/include/syscall_list.h

@@ -56,7 +56,7 @@ SYSCALL_HANDLED(36, getitimer)
 SYSCALL_HANDLED(38, setitimer)
 SYSCALL_HANDLED(39, getpid)
 SYSCALL_HANDLED(56, clone)
-SYSCALL_DELEGATED(57, fork)
+SYSCALL_HANDLED(57, fork)
 SYSCALL_HANDLED(58, vfork)
 SYSCALL_HANDLED(59, execve)
 SYSCALL_HANDLED(60, exit)

arch/x86_64/kernel/syscall.c

@@ -1487,6 +1487,16 @@ SYSCALL_DECLARE(clone)
                    ihk_mc_syscall_sp(ctx));
 }
 
+SYSCALL_DECLARE(fork)
+{
+	return do_fork(SIGCHLD, 0, 0, 0, 0, ihk_mc_syscall_pc(ctx), ihk_mc_syscall_sp(ctx));
+}
+
+SYSCALL_DECLARE(vfork)
+{
+	return do_fork(CLONE_VFORK|SIGCHLD, 0, 0, 0, 0, ihk_mc_syscall_pc(ctx), ihk_mc_syscall_sp(ctx));
+}
+
 SYSCALL_DECLARE(shmget)
 {
 	const key_t key = ihk_mc_syscall_arg0(ctx);