/* | |
* FreeRTOS Kernel V10.3.1 | |
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
* | |
* 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. | |
* | |
* http://www.FreeRTOS.org | |
* http://aws.amazon.com/freertos | |
* | |
* 1 tab == 4 spaces! | |
*/ | |
.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 |