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[kopensolaris-gnu/glibc.git] / mach / setup-thread.c

diff --git a/mach/setup-thread.c b/mach/setup-thread.c
index 375231b..a49fe3f 100644 (file)
--- a/mach/setup-thread.c
+++ b/mach/setup-thread.c
@@ -1,43 +1,80 @@
-/* Copyright (C) 1991, 1994 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991, 1994, 1995, 1997 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 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.
+   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.  */
+   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 <hurd.h>
 #include <mach.h>
-#include <thread_state.h>
+#include "thread_state.h"
+#include <string.h>
+#include <mach/machine/vm_param.h>
+#include "sysdep.h"            /* Defines stack direction.  */
 
-#define        STACK_SIZE      (4 * __vm_page_size) /* ? XXX */
+#define        STACK_SIZE      (16 * 1024 * 1024) /* 16MB, arbitrary.  */
 
-/* Give THREAD a stack and set it to run at PC when resumed.  */
-error_t
-_hurd_setup_thread (task_t task, thread_t thread, void *pc)
+/* Give THREAD a stack and set it to run at PC when resumed.
+   If *STACK_SIZE is nonzero, that size of stack is allocated.
+   If *STACK_BASE is nonzero, that stack location is used.
+   If STACK_BASE is not null it is filled in with the chosen stack base.
+   If STACK_SIZE is not null it is filled in with the chosen stack size.
+   Regardless, an extra page of red zone is allocated off the end; this
+   is not included in *STACK_SIZE.  */
+
+kern_return_t
+__mach_setup_thread (task_t task, thread_t thread, void *pc,
+                    vm_address_t *stack_base, vm_size_t *stack_size)
 {
-  error_t error;
-  struct hurd_thread_state ts;
-  size_t tssize = HURD_THREAD_STATE_COUNT;
+  kern_return_t error;
+  struct machine_thread_state ts;
+  mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
   vm_address_t stack;
+  vm_size_t size;
+  int anywhere;
+
+  size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
+  stack = stack_base ? *stack_base ? : 0 : 0;
+  anywhere = !stack_base || !*stack_base;
 
-  if (error = __vm_allocate (task, &stack, STACK_SIZE, 1))
+  error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
+  if (error)
     return error;
 
+  if (stack_size)
+    *stack_size = size;
+
   memset (&ts, 0, sizeof (ts));
-  ts.PC = (int) pc;
-  ts.SP = stack + STACK_SIZE;
+  MACHINE_THREAD_STATE_SET_PC (&ts, pc);
+#ifdef STACK_GROWTH_DOWN
+  if (stack_base)
+    *stack_base = stack + __vm_page_size;
+  ts.SP = stack + __vm_page_size + size;
+#elif defined (STACK_GROWTH_UP)
+  if (stack_base)
+    *stack_base = stack;
+  ts.SP = stack;
+  stack += size;
+#else
+  #error stack direction unknown
+#endif
 
-  return __thread_set_state (thread, HURD_THREAD_STATE_FLAVOR,
+  /* Create the red zone.  */
+  if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
+    return error;
+
+  return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
                             (int *) &ts, tssize);
 }
+
+weak_alias (__mach_setup_thread, mach_setup_thread)