1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/*
* Copyright (c) 2012-2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdnoreturn.h>
#include <kern/init.h>
#include <kern/thread.h>
#include <machine/cpu.h>
#include <machine/pmap.h>
#include <machine/strace.h>
#include <machine/tcb.h>
noreturn void tcb_context_load(struct tcb *tcb);
noreturn void tcb_start(void);
void tcb_context_restore(void);
struct tcb *tcb_current_ptr __percpu;
static void
tcb_stack_push(struct tcb *tcb, uintptr_t word)
{
uintptr_t *ptr;
ptr = (uintptr_t *)tcb->sp;
ptr--;
*ptr = word;
tcb->sp = (uintptr_t)ptr;
}
#ifdef __LP64__
static void
tcb_stack_forge(struct tcb *tcb, void (*fn)(void *), void *arg)
{
tcb_stack_push(tcb, (uintptr_t)arg);
tcb_stack_push(tcb, (uintptr_t)fn);
tcb_stack_push(tcb, (uintptr_t)tcb_start); /* Return address */
tcb_stack_push(tcb, 0); /* RBX */
tcb_stack_push(tcb, 0); /* R12 */
tcb_stack_push(tcb, 0); /* R13 */
tcb_stack_push(tcb, 0); /* R14 */
tcb_stack_push(tcb, 0); /* R15 */
}
#else /* __LP64__ */
static void
tcb_stack_forge(struct tcb *tcb, void (*fn)(void *), void *arg)
{
tcb_stack_push(tcb, (uintptr_t)arg);
tcb_stack_push(tcb, (uintptr_t)fn);
tcb_stack_push(tcb, (uintptr_t)tcb_start); /* Return address */
tcb_stack_push(tcb, 0); /* EBX */
tcb_stack_push(tcb, 0); /* EDI */
tcb_stack_push(tcb, 0); /* ESI */
}
#endif /* __LP64__ */
int
tcb_build(struct tcb *tcb, void *stack, void (*fn)(void *), void *arg)
{
int error;
error = pmap_thread_build(thread_from_tcb(tcb));
if (error) {
return error;
}
tcb->bp = 0;
tcb->sp = (uintptr_t)stack + TCB_STACK_SIZE;
tcb_stack_forge(tcb, fn, arg);
return 0;
}
void
tcb_cleanup(struct tcb *tcb)
{
pmap_thread_cleanup(thread_from_tcb(tcb));
}
void __init
tcb_load(struct tcb *tcb)
{
assert(!cpu_intr_enabled());
tcb_set_current(tcb);
tcb_context_load(tcb);
}
void
tcb_trace(const struct tcb *tcb)
{
strace_show((uintptr_t)tcb_context_restore, tcb->bp);
}
static int __init
tcb_setup(void)
{
return 0;
}
INIT_OP_DEFINE(tcb_setup,
INIT_OP_DEP(cpu_setup, true));
|
