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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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.
ChibiOS 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/>.
*/
/**
* @file compilers/RVCT/chcoreasm_v6m.s
* @brief ARMv6-M architecture port low level code.
*
* @addtogroup ARMCMx_RVCT_CORE
* @{
*/
#if !defined(FALSE) || defined(__DOXYGEN__)
#define FALSE 0
#endif
#if !defined(TRUE) || defined(__DOXYGEN__)
#define TRUE 1
#endif
#define _FROM_ASM_
#include "chconf.h"
#include "chcore.h"
#if !defined(__DOXYGEN__)
CONTEXT_OFFSET EQU 12
SCB_ICSR EQU 0xE000ED04
PRESERVE8
THUMB
AREA |.text|, CODE, READONLY
IMPORT chThdExit
IMPORT chSchDoReschedule
#if CH_DBG_STATISTICS
IMPORT _stats_start_measure_crit_thd
IMPORT _stats_stop_measure_crit_thd
#endif
#if CH_DBG_SYSTEM_STATE_CHECK
IMPORT _dbg_check_unlock
IMPORT _dbg_check_lock
#endif
/*
* Performs a context switch between two threads.
*/
EXPORT _port_switch
_port_switch PROC
push {r4, r5, r6, r7, lr}
mov r4, r8
mov r5, r9
mov r6, r10
mov r7, r11
push {r4, r5, r6, r7}
mov r3, sp
str r3, [r1, #CONTEXT_OFFSET]
ldr r3, [r0, #CONTEXT_OFFSET]
mov sp, r3
pop {r4, r5, r6, r7}
mov r8, r4
mov r9, r5
mov r10, r6
mov r11, r7
pop {r4, r5, r6, r7, pc}
ENDP
/*
* Start a thread by invoking its work function.
* If the work function returns @p chThdExit() is automatically invoked.
*/
EXPORT _port_thread_start
_port_thread_start PROC
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
#if CH_DBG_STATISTICS
bl _stats_stop_measure_crit_thd
#endif
cpsie i
mov r0, r5
blx r4
bl chThdExit
ENDP
/*
* Post-IRQ switch code.
* Exception handlers return here for context switching.
*/
EXPORT _port_switch_from_isr
EXPORT _port_exit_from_isr
_port_switch_from_isr PROC
#if CH_DBG_STATISTICS
bl _stats_start_measure_crit_thd
#endif
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_lock
#endif
bl chSchDoReschedule
#if CH_DBG_SYSTEM_STATE_CHECK
bl _dbg_check_unlock
#endif
#if CH_DBG_STATISTICS
bl _stats_stop_measure_crit_thd
#endif
_port_exit_from_isr
ldr r2, =SCB_ICSR
movs r3, #128
#if CORTEX_ALTERNATE_SWITCH
lsls r3, r3, #21
str r3, [r2, #0]
cpsie i
#else
lsls r3, r3, #24
str r3, [r2, #0]
#endif
waithere b waithere
ENDP
END
#endif /* !defined(__DOXYGEN__) */
/** @} */
|
