1 /* Copyright (C) 1991,1994,1995,1997,2002,2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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
20 #include <thread_state.h>
22 #include <mach/machine/vm_param.h>
23 #include <sysdep.h" /* Defines stack direction. *>
25 #define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */
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. */
36 __mach_setup_thread (task_t task, thread_t thread, void *pc,
37 vm_address_t *stack_base, vm_size_t *stack_size)
40 struct machine_thread_state ts;
41 mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
46 size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE;
47 stack = stack_base ? *stack_base ? : 0 : 0;
48 anywhere = !stack_base || !*stack_base;
50 error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere);
57 memset (&ts, 0, sizeof (ts));
58 MACHINE_THREAD_STATE_SET_PC (&ts, pc);
59 #ifdef STACK_GROWTH_DOWN
61 *stack_base = stack + __vm_page_size;
62 ts.SP = stack + __vm_page_size + size;
63 #elif defined (STACK_GROWTH_UP)
69 #error stack direction unknown
72 /* Create the red zone. */
73 if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
76 return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
77 (natural_t *) &ts, tssize);
80 weak_alias (__mach_setup_thread, mach_setup_thread)