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https://github.com/FreeRTOS/FreeRTOS-Kernel.git
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49e88310be
* Fix compilation issue of IAR32 port * Add new line at EOF * Fix header check --------- Co-authored-by: Gaurav-Aggarwal-AWS <33462878+aggarg@users.noreply.github.com>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
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* FreeRTOS Kernel <DEVELOPMENT BRANCH>
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* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* https://www.FreeRTOS.org
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* https://github.com/FreeRTOS
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*
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*/
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.extern ulTopOfSystemStack
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.extern ulInterruptNesting
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/*-----------------------------------------------------------*/
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.macro portFREERTOS_INTERRUPT_ENTRY
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/* Save general purpose registers. */
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pusha
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/* If ulInterruptNesting is zero the rest of the task context will need
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saving and a stack switch might be required. */
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movl ulInterruptNesting, %eax
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test %eax, %eax
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jne 2f
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/* Interrupts are not nested, so save the rest of the task context. */
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.if configSUPPORT_FPU == 1
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/* If the task has a buffer allocated to save the FPU context then
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save the FPU context now. */
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movl pucPortTaskFPUContextBuffer, %eax
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test %eax, %eax
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je 1f
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fnsave ( %eax ) /* Save FLOP context into ucTempFPUBuffer array. */
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fwait
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1:
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/* Save the address of the FPU context, if any. */
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push pucPortTaskFPUContextBuffer
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.endif /* configSUPPORT_FPU */
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/* Find the TCB. */
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movl pxCurrentTCB, %eax
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/* Stack location is first item in the TCB. */
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movl %esp, (%eax)
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/* Switch stacks. */
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movl ulTopOfSystemStack, %esp
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movl %esp, %ebp
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2:
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/* Increment nesting count. */
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add $1, ulInterruptNesting
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.endm
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/*-----------------------------------------------------------*/
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.macro portINTERRUPT_EPILOGUE
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cli
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sub $1, ulInterruptNesting
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/* If the nesting has unwound to zero. */
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movl ulInterruptNesting, %eax
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test %eax, %eax
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jne 2f
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/* If a yield was requested then select a new TCB now. */
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movl ulPortYieldPending, %eax
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test %eax, %eax
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je 1f
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movl $0, ulPortYieldPending
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call vTaskSwitchContext
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1:
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/* Stack location is first item in the TCB. */
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movl pxCurrentTCB, %eax
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movl (%eax), %esp
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.if configSUPPORT_FPU == 1
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/* Restore address of task's FPU context buffer. */
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pop pucPortTaskFPUContextBuffer
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/* If the task has a buffer allocated in which its FPU context is saved,
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then restore it now. */
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movl pucPortTaskFPUContextBuffer, %eax
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test %eax, %eax
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je 1f
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frstor ( %eax )
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1:
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.endif
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2:
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popa
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.endm
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/*-----------------------------------------------------------*/
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.macro portFREERTOS_INTERRUPT_EXIT
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portINTERRUPT_EPILOGUE
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/* EOI. */
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movl $0x00, (0xFEE000B0)
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iret
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.endm
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