1 files changed, 106 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/i386/pt-setup.c b/sysdeps/mach/hurd/i386/pt-setup.c
new file mode 100644
index 0000000..73fd43d
--- /dev/null
+++ b/sysdeps/mach/hurd/i386/pt-setup.c
@@ -0,0 +1,106 @@
+/* Setup thread stack.  Hurd/i386 version.
+   Copyright (C) 2000, 2002, 2005, 2007, 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stdint.h>
+#include <assert.h>
+#include <mach.h>
+
+#include <pt-internal.h>
+
+/* The stack layout used on the i386 is:
+
+    -----------------
+   |  ARG            |
+    -----------------
+   |  START_ROUTINE  |
+    -----------------
+   |  0              |
+    -----------------
+   |                 |
+   |  Fast TSD       |
+   |                 |
+    -----------------
+
+    We need to reserve __hurd_threadvar_max `unsigned long int's' of
+    (fast) thread-specific data (TSD) for the Hurd.  */
+
+/* Set up the stack for THREAD, such that it appears as if
+   START_ROUTINE and ARG were passed to the new thread's entry-point.
+   Return the stack pointer for the new thread.  */
+static void *
+stack_setup (struct __pthread *thread,
+	     void *(*start_routine)(void *), void *arg)
+{
+  error_t err;
+  uintptr_t *bottom, *top;
+
+  /* Calculate the top of the new stack.  */
+  bottom = thread->stackaddr;
+  top = (uintptr_t *) ((uintptr_t) bottom + thread->stacksize);
+
+  /* Next, make room for the TSDs.  */
+  top -= __hurd_threadvar_max;
+
+  if (start_routine)
+    {
+      /* And then the call frame.  */
+      top -= 3;
+      top = (uintptr_t *) ((uintptr_t) top & ~0xf);
+      top[2] = (uintptr_t) arg;	/* Argument to START_ROUTINE.  */
+      top[1] = (uintptr_t) start_routine;
+      top[0] = (uintptr_t) thread;
+      *--top = 0;		/* Fake return address.  */
+    }
+
+  if (thread->guardsize)
+    {
+      err = __vm_protect (__mach_task_self (), (vm_address_t) bottom,
+			  thread->guardsize, 0, 0);
+      assert_perror (err);
+    }
+
+  return top;
+}
+
+int
+__pthread_setup (struct __pthread *thread,
+		 void (*entry_point)(struct __pthread *, void *(*)(void *), void *),
+		 void *(*start_routine)(void *), void *arg)
+{
+  error_t err;
+  mach_port_t ktid;
+
+  thread->mcontext.pc = entry_point;
+  thread->mcontext.sp = stack_setup (thread, start_routine, arg);
+
+  thread->tcb->self = thread->kernel_thread;
+
+  ktid = __mach_thread_self ();
+  if (thread->kernel_thread != ktid)
+    {
+      err = __thread_set_pcsptp (thread->kernel_thread,
+			       1, thread->mcontext.pc,
+			       1, thread->mcontext.sp,
+			       1, thread->tcb);
+      assert_perror (err);
+    }
+  __mach_port_deallocate (__mach_task_self (), ktid);
+
+  return 0;
+}