1;/*
2; * FreeRTOS Kernel V11.1.0
3; * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
4; *
5; * SPDX-License-Identifier: MIT
6; *
7; * Permission is hereby granted, free of charge, to any person obtaining a copy of
8; * this software and associated documentation files (the "Software"), to deal in
9; * the Software without restriction, including without limitation the rights to
10; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11; * the Software, and to permit persons to whom the Software is furnished to do so,
12; * subject to the following conditions:
13; *
14; * The above copyright notice and this permission notice shall be included in all
15; * copies or substantial portions of the Software.
16; *
17; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
20; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23; *
24; * https://www.FreeRTOS.org
25; * https://github.com/FreeRTOS
26; *
27; */
28    .macro portSAVE_CONTEXT
29
30    ; Save r0 to r14 and pr.
31    movml.l r15, @-r15
32
33    ; Save mac1, mach and gbr
34    sts.l   macl, @-r15
35    sts.l   mach, @-r15
36    stc.l   gbr, @-r15
37
38    ; Get the address of pxCurrentTCB
39    mov.l   #_pxCurrentTCB, r0
40
41    ; Get the address of pxTopOfStack from the TCB.
42    mov.l   @r0, r0
43
44    ; Save the stack pointer in pxTopOfStack.
45    mov.l   r15, @r0
46
47    .endm
48
49;-----------------------------------------------------------
50
51    .macro portRESTORE_CONTEXT
52
53    ; Get the address of the pxCurrentTCB variable.
54    mov.l   #_pxCurrentTCB, r0
55
56    ; Get the address of the task stack from pxCurrentTCB.
57    mov.l   @r0, r0
58
59    ; Get the task stack itself into the stack pointer.
60    mov.l   @r0, r15
61
62    ; Restore system registers.
63    ldc.l   @r15+, gbr
64    lds.l   @r15+, mach
65    lds.l   @r15+, macl
66
67    ; Restore r0 to r14 and PR
68    movml.l @r15+, r15
69
70    ; Pop the SR and PC to jump to the start of the task.
71    rte
72    nop
73
74    .endm
75;-----------------------------------------------------------
76