1 | /* Copyright (C) 1991-2024 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 <mach/setup-thread.h> |
20 | #include <thread_state.h> |
21 | #include <string.h> |
22 | #include <ldsodefs.h> |
23 | #include "sysdep.h" /* Defines stack direction. */ |
24 | |
25 | #define STACK_SIZE (16 * 1024 * 1024) /* 16MB, arbitrary. */ |
26 | |
27 | static kern_return_t |
28 | mach_setup_thread_impl (task_t task, thread_t thread, int is_call, |
29 | void *pc, vm_address_t *stack_base, |
30 | vm_size_t *stack_size) |
31 | { |
32 | kern_return_t error; |
33 | struct machine_thread_state ts; |
34 | mach_msg_type_number_t tssize = MACHINE_THREAD_STATE_COUNT; |
35 | vm_address_t stack, stack_start; |
36 | vm_size_t size; |
37 | int anywhere; |
38 | |
39 | memset (&ts, 0, sizeof (ts)); |
40 | |
41 | size = stack_size ? *stack_size ? : STACK_SIZE : STACK_SIZE; |
42 | stack = stack_base ? *stack_base ? : 0 : 0; |
43 | anywhere = !stack_base || !*stack_base; |
44 | |
45 | error = __vm_allocate (task, &stack, size + __vm_page_size, anywhere); |
46 | if (error) |
47 | return error; |
48 | |
49 | if (stack_size) |
50 | *stack_size = size; |
51 | |
52 | #ifdef STACK_GROWTH_DOWN |
53 | stack_start = stack + __vm_page_size; |
54 | #elif defined (STACK_GROWTH_UP) |
55 | stack_start = stack; |
56 | stack += size; |
57 | #else |
58 | #error stack direction unknown |
59 | #endif |
60 | if (stack_base) |
61 | *stack_base = stack_start; |
62 | |
63 | if (is_call) |
64 | MACHINE_THREAD_STATE_SETUP_CALL (&ts, stack_start, size, pc); |
65 | else |
66 | { |
67 | MACHINE_THREAD_STATE_SET_PC (&ts, pc); |
68 | MACHINE_THREAD_STATE_SET_SP (&ts, stack_start, size); |
69 | } |
70 | |
71 | /* Create the red zone. */ |
72 | if (error = __vm_protect (task, stack, __vm_page_size, 0, VM_PROT_NONE)) |
73 | return error; |
74 | |
75 | return __thread_set_state (thread, MACHINE_NEW_THREAD_STATE_FLAVOR, |
76 | (natural_t *) &ts, tssize); |
77 | } |
78 | |
79 | /* Give THREAD a stack and set it to run at PC when resumed. |
80 | If *STACK_SIZE is nonzero, that size of stack is allocated. |
81 | If *STACK_BASE is nonzero, that stack location is used. |
82 | If STACK_BASE is not null it is filled in with the chosen stack base. |
83 | If STACK_SIZE is not null it is filled in with the chosen stack size. |
84 | Regardless, an extra page of red zone is allocated off the end; this |
85 | is not included in *STACK_SIZE. */ |
86 | |
87 | kern_return_t |
88 | __mach_setup_thread (task_t task, thread_t thread, void *pc, |
89 | vm_address_t *stack_base, vm_size_t *stack_size) |
90 | { |
91 | return mach_setup_thread_impl (task, thread, 0, pc, stack_base, stack_size); |
92 | } |
93 | |
94 | weak_alias (__mach_setup_thread, mach_setup_thread) |
95 | |
96 | kern_return_t |
97 | __mach_setup_thread_call (task_t task, thread_t thread, void *pc, |
98 | vm_address_t *stack_base, vm_size_t *stack_size) |
99 | { |
100 | return mach_setup_thread_impl (task, thread, 1, pc, stack_base, stack_size); |
101 | } |
102 | |
103 | /* Give THREAD a TLS area. */ |
104 | kern_return_t |
105 | __mach_setup_tls (thread_t thread) |
106 | { |
107 | tcbhead_t *tcb = _dl_allocate_tls (NULL); |
108 | if (tcb == NULL) |
109 | return KERN_RESOURCE_SHORTAGE; |
110 | |
111 | return _hurd_tls_new (thread, tcb); |
112 | } |
113 | |
114 | weak_alias (__mach_setup_tls, mach_setup_tls) |
115 | |