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-rw-r--r--libc/sysdeps/linux/hppa/clone.S102
1 files changed, 102 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/hppa/clone.S b/libc/sysdeps/linux/hppa/clone.S
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+++ b/libc/sysdeps/linux/hppa/clone.S
@@ -0,0 +1,102 @@
+/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by David Huggins-Daines <dhd@debian.org>, 2000.
+ Based on the Alpha version by Richard Henderson <rth@tamu.edu>, 1996.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 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 <asm/unistd.h>
+#define _ERRNO_H 1
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
+
+.text
+.global __clone
+.type __clone,%function
+__clone:
+ /* FIXME: I have no idea how profiling works on hppa. */
+
+ /* Sanity check arguments. */
+ comib,= 0,%arg0,.Lerror /* no NULL function pointers */
+ ldi -EINVAL,%ret0
+ comib,= 0,%arg1,.Lerror /* no NULL stack pointers */
+ nop
+
+ /* Save the fn ptr and arg on the new stack. */
+ stwm %arg0,64(%arg1)
+ stw %arg3,-60(%arg1)
+
+ /* Save the PIC register. */
+#ifdef __PIC__
+ stw %r19,-32(%sr0, %sp) /* parent */
+#endif
+
+ /* Do the system call */
+ copy %arg2,%arg0
+ ble 0x100(%sr2,%r0)
+ ldi __NR_clone,%r20
+
+ ldi -4096,%r1
+ comclr,>>= %r1,%ret0,%r0 /* Note: unsigned compare. */
+ b,n .Lerror
+
+ comib,=,n 0,%ret0,thread_start
+
+ /* Successful return from the parent
+ No need to restore the PIC register,
+ since we return immediately. */
+
+ bv %r0(%rp)
+ nop
+
+ /* Something bad happened -- no child created */
+.Lerror:
+
+ /* Restore the PIC register on error */
+#ifdef __PIC__
+ ldw -32(%sr0, %sp), %r19 /* parent */
+#endif
+
+ b __syscall_error
+ sub %r0,%ret0,%arg0
+
+thread_start:
+
+ /* Load up the arguments. */
+ ldw -60(%sr0, %sp),%arg0
+ ldw -64(%sr0, %sp),%r22
+
+ /* $$dyncall fixes childs PIC register */
+
+ /* Call the user's function */
+ bl $$dyncall,%r31
+ copy %r31,%rp
+
+ bl _exit,%rp
+ copy %ret0,%arg0
+
+ /* Die horribly. */
+ iitlbp %r0,(%r0)
+
+.size __clone,.-__clone
+
+.weak clone
+ clone = __clone