1 /* Copyright (C) 1991-2022 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, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <mach.h>
19 #include <thread_state.h>
20 #include <string.h>
21 #include <mach/machine/vm_param.h>
22 #include <ldsodefs.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
__mach_setup_thread(task_t task,thread_t thread,void * pc,vm_address_t * stack_base,vm_size_t * 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)
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_NEW_THREAD_STATE_FLAVOR,
77 (natural_t *) &ts, tssize);
78 }
79
weak_alias(__mach_setup_thread,mach_setup_thread)80 weak_alias (__mach_setup_thread, mach_setup_thread)
81
82 /* Give THREAD a TLS area. */
83 kern_return_t
84 __mach_setup_tls (thread_t thread)
85 {
86 kern_return_t error;
87 struct machine_thread_state ts;
88 mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT;
89 tcbhead_t *tcb;
90
91 tcb = _dl_allocate_tls (NULL);
92 if (tcb == NULL)
93 return KERN_RESOURCE_SHORTAGE;
94
95 if (error = __thread_get_state (thread, MACHINE_THREAD_STATE_FLAVOR,
96 (natural_t *) &ts, &tssize))
97 return error;
98 assert (tssize == MACHINE_THREAD_STATE_COUNT);
99
100 _hurd_tls_new (thread, &ts, tcb);
101
102 error = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
103 (natural_t *) &ts, tssize);
104 return error;
105 }
106
107 weak_alias (__mach_setup_tls, mach_setup_tls)
108