Update.
[glibc.git] / mach / setup-thread.c
bloba49fe3f2edf915fd7b1f3e534754a268445ce749
1 /* Copyright (C) 1991, 1994, 1995, 1997 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
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. */
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. */
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)
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;
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);
51 if (error)
52 return error;
54 if (stack_size)
55 *stack_size = size;
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
72 /* Create the red zone. */
73 if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE))
74 return error;
76 return __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
77 (int *) &ts, tssize);
80 weak_alias (__mach_setup_thread, mach_setup_thread)