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authorDavid McCullough <davidm@snapgear.com>2003-10-14 11:52:32 +0000
committerDavid McCullough <davidm@snapgear.com>2003-10-14 11:52:32 +0000
commit94b92c2fab333403aa43fd55ec858fdbf666f8c3 (patch)
tree10e30871a37756c010dbbb26326bf934ba434552 /libc/sysdeps/linux/microblaze/clone.c
parent34c5a8290b32d93beca6ae8f9c346bbadf408591 (diff)
Microblaze port from the uClinux-dist,
contributed by John Williams <jwilliams@itee.uq.edu.au>
Diffstat (limited to 'libc/sysdeps/linux/microblaze/clone.c')
-rw-r--r--libc/sysdeps/linux/microblaze/clone.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/clone.c b/libc/sysdeps/linux/microblaze/clone.c
new file mode 100644
index 000000000..f82cd9dc0
--- /dev/null
+++ b/libc/sysdeps/linux/microblaze/clone.c
@@ -0,0 +1,52 @@
+/*
+ * libc/sysdeps/linux/microblaze/clone.c -- `clone' syscall for linux/microblaze
+ *
+ * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
+ * Copyright (C) 2002,03 NEC Electronics Corporation
+ * Copyright (C) 2002,03 Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License. See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ * Microblaze port by John Williams
+ */
+
+#include <errno.h>
+#include <sys/syscall.h>
+
+int
+clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg)
+{
+ register unsigned long rval asm (SYSCALL_RET) = -EINVAL;
+
+ if (fn && child_stack)
+ {
+ register unsigned long syscall asm (SYSCALL_NUM);
+ register unsigned long arg0 asm (SYSCALL_ARG0);
+ register unsigned long arg1 asm (SYSCALL_ARG1);
+
+ /* Clone this thread. */
+ arg0 = flags;
+ arg1 = (unsigned long)child_stack;
+ syscall = __NR_clone;
+ asm volatile ("bralid r17, trap;nop;"
+ : "=r" (rval), "=r" (syscall)
+ : "1" (syscall), "r" (arg0), "r" (arg1)
+ : SYSCALL_CLOBBERS);
+
+ if (rval == 0)
+ /* In child thread, call FN and exit. */
+ {
+ arg0 = (*fn) (arg);
+ syscall = __NR_exit;
+ asm volatile ("bralid r17, trap;nop;"
+ : "=r" (rval), "=r" (syscall)
+ : "1" (syscall), "r" (arg0)
+ : SYSCALL_CLOBBERS);
+ }
+ }
+
+ __syscall_return (int, rval);
+}