grab a tiny mmap implementation from glibc

libc/sysdeps/linux/i386/Makefile

@@ -25,7 +25,7 @@ SCRT_OBJ = $(patsubst %,S%, $(CRT_OBJ))
 CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
 
 SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
-	bsd-_setjmp.S syscall.S mmap64.S
+	bsd-_setjmp.S syscall.S mmap.S mmap64.S
 SOBJS=$(patsubst %.S,%.o, $(SSRC))
 
 CSRC=brk.c sigaction.c __syscall_error.c

libc/sysdeps/linux/i386/mmap.S

@@ -0,0 +1,49 @@
+/* Copyright (C) 1995,96,97,98,99,2000,2002,2005 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#define _ERRNO_H	1
+#include <features.h>
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+.text
+.global mmap
+.type   mmap,%function
+mmap:
+
+	/* Save registers.  */
+	movl %ebx, %edx
+
+	movl $__NR_mmap, %eax	/* System call number in %eax.  */
+
+	lea 4(%esp), %ebx		/* Address of args is 1st arg.  */
+
+	/* Do the system call trap.  */
+	int $0x80
+
+	/* Restore registers.  */
+	movl %edx, %ebx
+
+	/* If 0 > %eax > -4096 there was an error.  */
+	cmpl $-4096, %eax
+	ja __syscall_error
+
+	/* Successful; return the syscall's value.  */
+	ret
+
+.size mmap,.-mmap