Nearly missed this one.

List non-default asm sources in MDASM so that they replace the defaults.

For funny or incomplete syscalls, list them in NOASM to stop them
from getting built as defaults.

lib/libc/amd64/sys/Makefile.inc

@@ -1,8 +1,27 @@
 #	from: Makefile.inc,v 1.1 1993/09/03 19:04:23 jtc Exp
-#	$Id: Makefile.inc,v 1.6 1997/10/16 14:26:13 bde Exp $
+#	$Id: Makefile.inc,v 1.7 1997/10/16 14:41:25 bde Exp $
 
 SRCS+=	i386_get_ldt.c i386_set_ldt.c
 
+# _thread_create.S
+
+MDASM=	Ovfork.S brk.S cerror.S exect.S fork.S pipe.S \
+	ptrace.S reboot.S rfork.S sbrk.S setlogin.S sigpending.S \
+	sigprocmask.S sigreturn.S sigsuspend.S syscall.S
+
+# Don't generate default code for these syscalls:
+NOASM=	__semctl.o break.o exit.o ftruncate.o getdomainname.o getlogin.o \
+	lseek.o mlockall.o mmap.o msgctl.o msgget.o msgrcv.o msgsnd.o \
+	munlockall.o openbsd_poll.o semconfig.o semget.o semop.o \
+	setdomainname.o shmat.o shmctl.o shmdt.o shmget.o sstk.o \
+	thr_sleep.o thr_wakeup.o truncate.o uname.o vfork.o yield.o
+
+PSEUDO=	_getlogin.o
+
+# Pseudo syscalls that are renamed as _thread_sys_{pseudo} when
+# building libc_r.
+PSEUDOR=	_exit.o
+
 .if ${LIB} == "c"
 MAN2+=	i386_get_ldt.2
 

lib/libc/i386/sys/Makefile.inc

@@ -1,8 +1,27 @@
 #	from: Makefile.inc,v 1.1 1993/09/03 19:04:23 jtc Exp
-#	$Id: Makefile.inc,v 1.6 1997/10/16 14:26:13 bde Exp $
+#	$Id: Makefile.inc,v 1.7 1997/10/16 14:41:25 bde Exp $
 
 SRCS+=	i386_get_ldt.c i386_set_ldt.c
 
+# _thread_create.S
+
+MDASM=	Ovfork.S brk.S cerror.S exect.S fork.S pipe.S \
+	ptrace.S reboot.S rfork.S sbrk.S setlogin.S sigpending.S \
+	sigprocmask.S sigreturn.S sigsuspend.S syscall.S
+
+# Don't generate default code for these syscalls:
+NOASM=	__semctl.o break.o exit.o ftruncate.o getdomainname.o getlogin.o \
+	lseek.o mlockall.o mmap.o msgctl.o msgget.o msgrcv.o msgsnd.o \
+	munlockall.o openbsd_poll.o semconfig.o semget.o semop.o \
+	setdomainname.o shmat.o shmctl.o shmdt.o shmget.o sstk.o \
+	thr_sleep.o thr_wakeup.o truncate.o uname.o vfork.o yield.o
+
+PSEUDO=	_getlogin.o
+
+# Pseudo syscalls that are renamed as _thread_sys_{pseudo} when
+# building libc_r.
+PSEUDOR=	_exit.o
+
 .if ${LIB} == "c"
 MAN2+=	i386_get_ldt.2