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 |
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 | |
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 | |