1 files changed, 117 insertions, 0 deletions
diff --git a/libpthread/sysdeps/l4/hurd/ia32/pt-setup.c b/libpthread/sysdeps/l4/hurd/ia32/pt-setup.c
new file mode 100644
index 00000000..579905c9
--- /dev/null
+++ b/libpthread/sysdeps/l4/hurd/ia32/pt-setup.c
@@ -0,0 +1,117 @@
+/* Setup thread stack.  Viengoos/i386 version.
+   Copyright (C) 2000, 2002, 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 <l4.h>
+
+#include <pt-internal.h>
+#include <hurd/thread.h>
+#include <hurd/exceptions.h>
+
+/* The stack layout used on the i386 is:
+
+    -----------------
+   |  ARG            |
+    -----------------
+   |  START_ROUTINE  |
+    -----------------
+   |  Return address |
+    -----------------  <- %ebp
+   |  Frame pointer  |
+    -----------------
+
+  We do the following: setup the stack to return to the entry routine.
+
+  
+*/
+
+/* The stack contains:
+
+    arg
+    start_routine
+    0 <- fake return address
+    C entry_point
+*/
+extern uintptr_t _pthread_entry_point;
+__asm__ ("\n\
+	.globl	_pthread_entry_point, __pthread_entry_point\n\
+_pthread_entry_point:\n\
+__pthread_entry_point:\n\
+	pushl	$0\n\
+	popf\n\
+\n\
+	xor %ebp, %ebp\n\
+	ret\n");
+
+/* 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.  We also take the
+   opportunity to install THREAD in our utcb.  */
+static void *
+stack_setup (struct __pthread *thread,
+	     void *(*start_routine)(void *), void *arg,
+	     void (*entry_point)(void *(*)(void *), void *))
+{
+  uintptr_t *top;
+
+  /* Calculate top of the new stack.  */
+  top = (uintptr_t *) ((uintptr_t) thread->stackaddr + thread->stacksize);
+
+  /* Align on 0x10 for MMX operations.  */
+  top = (uintptr_t) top & ~0xf;
+
+  if (start_routine)
+    {
+      /* Set up call frame.  */
+      *--top = (uintptr_t) arg;	/* Argument to START_ROUTINE.  */
+      *--top = (uintptr_t) start_routine;
+      *--top = 0;		/* Fake return address.  */
+      *--top = (uintptr_t) entry_point;
+    }
+
+  return top;
+}
+
+int
+__pthread_setup (struct __pthread *thread,
+		 void (*entry_point)(void *(*)(void *), void *),
+		 void *(*start_routine)(void *), void *arg)
+{
+  thread->mcontext.pc = (void *) &_pthread_entry_point;
+  thread->mcontext.sp = (void *) stack_setup (thread, start_routine, arg,
+					      entry_point);
+
+  if (__pthread_num_threads == 1)
+    return 0;
+
+  assert (! ADDR_IS_VOID (thread->exception_area[0]));
+
+  struct exception_page *exception_page = thread->exception_area_va;
+
+  /* SP is set to the end of the exception area minus one word, which
+     is the location of the exception page.  */
+  exception_page->exception_handler_sp
+    = (uintptr_t) thread->exception_area_va + EXCEPTION_AREA_SIZE;
+  exception_page->exception_handler_sp -= sizeof (void *);
+  * (void **) exception_page->exception_handler_sp = thread->exception_area_va;
+
+  exception_page->exception_handler_ip = (uintptr_t) &exception_handler_entry;
+  exception_page->exception_handler_end = (uintptr_t) &exception_handler_end;
+
+  return 0;
+}