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
|
/*
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* https://www.FreeRTOS.org
* https://github.com/FreeRTOS
*
*/
.extern ulTopOfSystemStack
.extern ulInterruptNesting
/*-----------------------------------------------------------*/
.macro portFREERTOS_INTERRUPT_ENTRY
/* Save general purpose registers. */
pusha
/* If ulInterruptNesting is zero the rest of the task context will need
saving and a stack switch might be required. */
movl ulInterruptNesting, %eax
test %eax, %eax
jne 2f
/* Interrupts are not nested, so save the rest of the task context. */
.if configSUPPORT_FPU == 1
/* If the task has a buffer allocated to save the FPU context then
save the FPU context now. */
movl pucPortTaskFPUContextBuffer, %eax
test %eax, %eax
je 1f
fnsave ( %eax ) /* Save FLOP context into ucTempFPUBuffer array. */
fwait
1:
/* Save the address of the FPU context, if any. */
push pucPortTaskFPUContextBuffer
.endif /* configSUPPORT_FPU */
/* Find the TCB. */
movl pxCurrentTCB, %eax
/* Stack location is first item in the TCB. */
movl %esp, (%eax)
/* Switch stacks. */
movl ulTopOfSystemStack, %esp
movl %esp, %ebp
2:
/* Increment nesting count. */
add $1, ulInterruptNesting
.endm
/*-----------------------------------------------------------*/
.macro portINTERRUPT_EPILOGUE
cli
sub $1, ulInterruptNesting
/* If the nesting has unwound to zero. */
movl ulInterruptNesting, %eax
test %eax, %eax
jne 2f
/* If a yield was requested then select a new TCB now. */
movl ulPortYieldPending, %eax
test %eax, %eax
je 1f
movl $0, ulPortYieldPending
call vTaskSwitchContext
1:
/* Stack location is first item in the TCB. */
movl pxCurrentTCB, %eax
movl (%eax), %esp
.if configSUPPORT_FPU == 1
/* Restore address of task's FPU context buffer. */
pop pucPortTaskFPUContextBuffer
/* If the task has a buffer allocated in which its FPU context is saved,
then restore it now. */
movl pucPortTaskFPUContextBuffer, %eax
test %eax, %eax
je 1f
frstor ( %eax )
1:
.endif
2:
popa
.endm
/*-----------------------------------------------------------*/
.macro portFREERTOS_INTERRUPT_EXIT
portINTERRUPT_EPILOGUE
/* EOI. */
movl $0x00, (0xFEE000B0)
iret
.endm
|
