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
27static kern_return_t
28mach_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
87kern_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
94weak_alias (__mach_setup_thread, mach_setup_thread)
95
96kern_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. */
104kern_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
114weak_alias (__mach_setup_tls, mach_setup_tls)
115

source code of glibc/mach/setup-thread.c