summaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/m68k/vfork.S
diff options
context:
space:
mode:
authorAndreas Schwab <schwab@linux-m68k.org>2014-02-10 20:05:01 +0100
committerAndreas Schwab <schwab@linux-m68k.org>2014-02-10 20:22:40 +0100
commit73588a7223bec40d652fd4c75f1cb4772c5d2612 (patch)
treedfc1f1965e78e62e611199d91c482d1b76ff109d /sysdeps/unix/sysv/linux/m68k/vfork.S
parent87569616d27a2c742f87b5dbcac2f2e3437fd874 (diff)
downloadglibc-73588a7223bec40d652fd4c75f1cb4772c5d2612.tar.gz
Move m68k from ports to libc
Diffstat (limited to 'sysdeps/unix/sysv/linux/m68k/vfork.S')
-rw-r--r--sysdeps/unix/sysv/linux/m68k/vfork.S74
1 files changed, 74 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/vfork.S b/sysdeps/unix/sysv/linux/m68k/vfork.S
new file mode 100644
index 0000000000..3745287cbf
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/m68k/vfork.S
@@ -0,0 +1,74 @@
+/* Copyright (C) 1999-2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Andreas Schwab <schwab@gnu.org>.
+
+ 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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#include <kernel-features.h>
+
+#ifndef SAVE_PID
+#define SAVE_PID
+#endif
+
+#ifndef RESTORE_PID
+#define RESTORE_PID
+#endif
+
+/* Clone the calling process, but without copying the whole address space.
+ The calling process is suspended until the new process exits or is
+ replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
+ and the process ID of the new process to the old process. */
+
+ENTRY (__vfork)
+
+ /* SAVE_PID clobbers call-clobbered registers and
+ saves data in D1 and A1. */
+
+ SAVE_PID
+
+ /* Pop the return PC value into A0. */
+ movel %sp@+, %a0
+ cfi_adjust_cfa_offset (-4)
+ cfi_register (%pc, %a0)
+
+ /* Stuff the syscall number in D0 and trap into the kernel. */
+ movel #SYS_ify (vfork), %d0
+ trap #0
+
+ RESTORE_PID
+
+ tstl %d0
+ jmi .Lerror /* Branch forward if it failed. */
+
+ /* Jump to the return PC. */
+ jmp %a0@
+
+.Lerror:
+ /* Push back the return PC. */
+ movel %a0,%sp@-
+ cfi_adjust_cfa_offset (4)
+ cfi_rel_offset (%pc, 0)
+
+#ifndef PIC
+ jbra SYSCALL_ERROR_LABEL
+#endif
+
+PSEUDO_END (__vfork)
+libc_hidden_def (__vfork)
+
+weak_alias (__vfork, vfork)