1: /* Copyright (C) 1991,94,1995,1997,2002,2005 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library is distributed in the hope that it will be useful,
   10:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   11:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <mach.h>
   20: #include <thread_state.h>
   21: #include <string.h>
   22: #include <mach/machine/vm_param.h>
   23: #include "sysdep.h"             /* Defines stack direction.  */
   24: 
   25: #define STACK_SIZE      (16 * 1024 * 1024) /* 16MB, arbitrary.  */
   26: 
   27: /* Give THREAD a stack and set it to run at PC when resumed.
   28:    If *STACK_SIZE is nonzero, that size of stack is allocated.
   29:    If *STACK_BASE is nonzero, that stack location is used.
   30:    If STACK_BASE is not null it is filled in with the chosen stack base.
   31:    If STACK_SIZE is not null it is filled in with the chosen stack size.
   32:    Regardless, an extra page of red zone is allocated off the end; this
   33:    is not included in *STACK_SIZE.  */
   34: 
   35: kern_return_t
   36: __mach_setup_thread (task_t task, thread_t thread, void *pc,
   37:                      vm_address_t *stack_base, vm_size_t *stack_size)
   38: {
   39:   kern_return_t error;
   40:   struct machine_thread_state ts;
   41:   mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
   42:   vm_address_t stack;
   43:   vm_size_t size;
   44:   int anywhere;
   45: 
   46:   size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
   47:   stack = stack_base ? *stack_base ? : 0 : 0;
   48:   anywhere = !stack_base || !*stack_base;
   49: 
   50:   error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
   51:   if (error)
   52:     return error;
   53: 
   54:   if (stack_size)
   55:     *stack_size = size;
   56: 
   57:   memset (&ts, 0, sizeof (ts));
   58:   MACHINE_THREAD_STATE_SET_PC (&ts, pc);
   59: #ifdef STACK_GROWTH_DOWN
   60:   if (stack_base)
   61:     *stack_base = stack + __vm_page_size;
   62:   ts.SP = stack + __vm_page_size + size;
   63: #elif defined (STACK_GROWTH_UP)
   64:   if (stack_base)
   65:     *stack_base = stack;
   66:   ts.SP = stack;
   67:   stack += size;
   68: #else
   69:   #error stack direction unknown
   70: #endif
   71: 
   72:   /* Create the red zone.  */
   73:   if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
   74:     return error;
   75: 
   76:   return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
   77:                              (natural_t *) &ts, tssize);
   78: }
   79: 
   80: weak_alias (__mach_setup_thread, mach_setup_thread)