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authorEric Andersen <andersen@codepoet.org>2001-02-09 04:51:35 +0000
committerEric Andersen <andersen@codepoet.org>2001-02-09 04:51:35 +0000
commiteb5667f0ce82995eacb0c6a86d76d83c8f881619 (patch)
treeb12b95cfe19d686762e1219b5cafa818165c6597 /libc/sysdeps/linux/arm/vfork.S
parent6340fb74f3cead5fc6f32be968d41d5931bcc863 (diff)
It turns out that vfork was completely broken. That was why it
wouldn't run on my little arm7tdmi/uClinux boards, since without vfork working, nothing works on uClinux. It took me forever to find this, since other problems were hiding this one. Big, huge, sigh of relief. -Erik
Diffstat (limited to 'libc/sysdeps/linux/arm/vfork.S')
-rw-r--r--libc/sysdeps/linux/arm/vfork.S73
1 files changed, 73 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/vfork.S b/libc/sysdeps/linux/arm/vfork.S
new file mode 100644
index 000000000..845a222ac
--- /dev/null
+++ b/libc/sysdeps/linux/arm/vfork.S
@@ -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
+