| /* |
| * 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 |