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-rw-r--r--sysdeps/unix/sysv/linux/m68k/clone.S75
1 files changed, 75 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/m68k/clone.S b/sysdeps/unix/sysv/linux/m68k/clone.S
new file mode 100644
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+++ b/sysdeps/unix/sysv/linux/m68k/clone.S
@@ -0,0 +1,75 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+ Contributed by Andreas Schwab (schwab@issan.informatik.uni-dortmund.de)
+
+The GNU C Library 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.
+
+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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* clone is even more special than fork as it mucks with stacks
+ and invokes a function in the right context after its all over. */
+
+#include <sysdep.h>
+#include <errnos.h>
+
+/* int clone (int (*fn) (), void *child_stack, int flags, int nargs, ...) */
+
+ .text
+ENTRY (__clone)
+ /* Sanity check arguments. */
+ movel #-EINVAL, %d0
+ movel 4(%sp), %a0 /* no NULL function pointers */
+ tstl %a0
+ jeq syscall_error
+ movel 8(%sp), %a1 /* no NULL stack pointers */
+ tstl %a1
+ jeq syscall_error
+ movel 16(%sp), %d1 /* no negative argument counts */
+ jmi syscall_error
+
+ /* Allocate space on the new stack and copy args over */
+ movel %d1, %d0
+ negl %d0
+ lea (%a1,%d0.l*4), %a1
+ jeq 2f
+1: movel 16(%sp,%d1.l*4), -4(%a1,%d1.l*4)
+ subql #1, %d1
+ jne 1b
+2:
+
+ /* Do the system call */
+ exg %d2, %a1 /* save %d2 and get stack pointer */
+ movel 12(%sp), %d1 /* get flags */
+ movel #SYS_ify (clone), %d0
+ trap #0
+ exg %d2, %a1 /* restore %d2 */
+
+ tstl %d0
+ jmi syscall_error
+ jeq thread_start
+
+ rts
+
+ SYSCALL_ERROR_HANDLER
+
+thread_start:
+ subl %fp, %fp /* terminate the stack frame */
+ jsr (%a0)
+ movel %d0, -(%sp)
+#ifdef PIC
+ bsrl _exit@PLTPC
+#else
+ jbsr _exit
+#endif
+
+weak_alias (__clone, clone)