| ;/* |
| ; * 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 |
| ; * |
| ; */ |
| .macro portSAVE_CONTEXT |
| |
| ; Save r0 to r14 and pr. |
| movml.l r15, @-r15 |
| |
| ; Save mac1, mach and gbr |
| sts.l macl, @-r15 |
| sts.l mach, @-r15 |
| stc.l gbr, @-r15 |
| |
| ; Get the address of pxCurrentTCB |
| mov.l #_pxCurrentTCB, r0 |
| |
| ; Get the address of pxTopOfStack from the TCB. |
| mov.l @r0, r0 |
| |
| ; Save the stack pointer in pxTopOfStack. |
| mov.l r15, @r0 |
| |
| .endm |
| |
| ;----------------------------------------------------------- |
| |
| .macro portRESTORE_CONTEXT |
| |
| ; Get the address of the pxCurrentTCB variable. |
| mov.l #_pxCurrentTCB, r0 |
| |
| ; Get the address of the task stack from pxCurrentTCB. |
| mov.l @r0, r0 |
| |
| ; Get the task stack itself into the stack pointer. |
| mov.l @r0, r15 |
| |
| ; Restore system registers. |
| ldc.l @r15+, gbr |
| lds.l @r15+, mach |
| lds.l @r15+, macl |
| |
| ; Restore r0 to r14 and PR |
| movml.l @r15+, r15 |
| |
| ; Pop the SR and PC to jump to the start of the task. |
| rte |
| nop |
| |
| .endm |
| ;----------------------------------------------------------- |