|
@@ -0,0 +1,73 @@
|
|
|
+/* vi: set sw=4 ts=4: */
|
|
|
+/*
|
|
|
+ * fork for uClibc
|
|
|
+ *
|
|
|
+ * Copyright (C) 2000 by Lineo, inc. Written by Erik Andersen
|
|
|
+ * <andersen@lineo.com>, <andersee@debian.org>
|
|
|
+ *
|
|
|
+ * This program 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.
|
|
|
+ *
|
|
|
+ * This program 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 this program; if not, write to the Free Software Foundation,
|
|
|
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
+ *
|
|
|
+ */
|
|
|
+
|
|
|
+#include <linux/errno.h>
|
|
|
+#include <asm/unistd.h>
|
|
|
+
|
|
|
+
|
|
|
+.global errno;
|
|
|
+
|
|
|
+
|
|
|
+.text
|
|
|
+.global vfork;
|
|
|
+.type vfork,%function
|
|
|
+.align 4; \
|
|
|
+
|
|
|
+
|
|
|
+
|
|
|
+vfork:
|
|
|
+
|
|
|
+#ifdef __SYS_vfork
|
|
|
+ swi __NR_vfork
|
|
|
+ cmn r0, #4096
|
|
|
+ movcc pc, lr
|
|
|
+
|
|
|
+ /* Check if vfork even exists. */
|
|
|
+ ldr r1, =-ENOSYS
|
|
|
+ teq r0, r1
|
|
|
+ bne __syscall_error
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* If we don't have vfork, use fork. */
|
|
|
+ swi __NR_fork
|
|
|
+ cmn r0, #4096
|
|
|
+
|
|
|
+ /* Syscal worked. Return to child/parent */
|
|
|
+ movcc pc, lr
|
|
|
+
|
|
|
+__syscall_error:
|
|
|
+
|
|
|
+ /* Looks like the syscall choked -- set errno */
|
|
|
+ ldr r3, .L4
|
|
|
+ /* Calculate the - of the syscall result, in case we need it */
|
|
|
+ rsb r2, r0, $0
|
|
|
+
|
|
|
+ /* errno = -result */
|
|
|
+ str r2, [r9,r3]
|
|
|
+
|
|
|
+ /* return -1 */
|
|
|
+ mvn r0, $0
|
|
|
+ mov pc, lr
|
|
|
+
|
|
|
+.L4: .word errno
|
|
|
+
|