USe the name crt0.o, and cp it to $(TOPDIR)/libcrt0.o

libc/sysdeps/linux/arm/Makefile

@@ -25,7 +25,10 @@ include $(TOPDIR)Rules.mak
 LIBC=$(TOPDIR)libc.a
 ASFLAGS=$(CFLAGS)
 
-SSRC=_start.S longjmp.S setjmp.S
+CRT0=_start.S
+CRT0_OBJ=$(patsubst %.S,%.o, $(CRT0))
+
+SSRC=longjmp.S setjmp.S
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
 CSRC=fork.c vfork.c
@@ -34,13 +37,18 @@ COBJS=$(patsubst %.c,%.o, $(CSRC))
 OBJS=$(SOBJS) $(MOBJ) $(COBJS)
 
 
-all: $(OBJS) $(LIBC)
+all: $(OBJS) $(CRT0_OBJ) $(LIBC)
 
 $(LIBC): ar-target
 
 ar-target: $(OBJS)
 	$(AR) $(ARFLAGS) $(LIBC) $(OBJS)
 
+$(CRT0_OBJ): %.o : %.S
+	$(CC) $(CFLAGS) -c $< -o $@
+	$(STRIPTOOL) -x -R .note -R .comment $*.o
+	cp $*.o $(TOPDIR)/libcrt0.o
+
 $(SOBJS): %.o : %.S
 	$(CC) $(CFLAGS) -c $< -o $@
 	$(STRIPTOOL) -x -R .note -R .comment $*.o

libc/sysdeps/linux/arm/crt0.S

@@ -0,0 +1,66 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+
+#define BASEREG r9
+
+@ r0 = argc
+@ r1 = argv
+@ r2 = envp
+@ sl = data segment
+
+
+
+	.text
+	.align 2
+	.global _start, exit, main
+	.type _start,%function
+
+.text
+_start:
+    @ adjust the data sgement base pointer
+	ldr r3,=__data_start
+	sub sl,sl,r3
+	mov	BASEREG,sl
+
+	ldr	r3, .L3
+	str r2,[BASEREG,r3]
+	ldr r0,[sp, #0]
+	ldr r1,[sp, #4]
+	ldr r2,[sp, #8]
+	bl  main
+	ldr r0,=0
+	bl  exit
+
+
+.L3:  .word environ
+
+
+	.data
+	.align 2
+	.global __errno, __environ
+	
+__environ:  .long 0
+.weak environ
+environ = __environ
+
+__errno:    .long 0
+.weak errno
+errno = __errno
+
+