You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
; FreeRTOS.org V4.7.2 - Copyright (C) 2003-2008 Richard Barry.
|
|
;
|
|
; This file is part of the FreeRTOS.org distribution.
|
|
;
|
|
; FreeRTOS.org is free software; you can redistribute it and/or modify
|
|
; it under the terms of the GNU General Public License as published by
|
|
; the Free Software Foundation; either version 2 of the License, or
|
|
; (at your option) any later version.
|
|
;
|
|
; FreeRTOS.org is distributed in the hope that it will be useful,
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
; GNU General Public License for more details.
|
|
;
|
|
; You should have received a copy of the GNU General Public License
|
|
; along with FreeRTOS.org; if not, write to the Free Software
|
|
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
;
|
|
; A special exception to the GPL can be applied should you wish to distribute
|
|
; a combined work that includes FreeRTOS.org, without being obliged to provide
|
|
; the source code for any proprietary components. See the licensing section
|
|
; of http://www.FreeRTOS.org for full details of how and when the exception
|
|
; can be applied.
|
|
;
|
|
; ***************************************************************************
|
|
; See http://www.FreeRTOS.org for documentation, latest information, license
|
|
; and contact details. Please ensure to read the configuration and relevant
|
|
; port sections of the online documentation.
|
|
; ***************************************************************************
|
|
|
|
EXTERN pxCurrentTCB
|
|
EXTERN ulCriticalNesting
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
; Context save and restore macro definitions
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
portSAVE_CONTEXT MACRO
|
|
|
|
; Push R0 as we are going to use the register.
|
|
STMDB SP!, {R0}
|
|
|
|
; Set R0 to point to the task stack pointer.
|
|
STMDB SP, {SP}^
|
|
NOP
|
|
SUB SP, SP, #4
|
|
LDMIA SP!, {R0}
|
|
|
|
; Push the return address onto the stack.
|
|
STMDB R0!, {LR}
|
|
|
|
; Now we have saved LR we can use it instead of R0.
|
|
MOV LR, R0
|
|
|
|
; Pop R0 so we can save it onto the system mode stack.
|
|
LDMIA SP!, {R0}
|
|
|
|
; Push all the system mode registers onto the task stack.
|
|
STMDB LR, {R0-LR}^
|
|
NOP
|
|
SUB LR, LR, #60
|
|
|
|
; Push the SPSR onto the task stack.
|
|
MRS R0, SPSR
|
|
STMDB LR!, {R0}
|
|
|
|
LDR R0, =ulCriticalNesting
|
|
LDR R0, [R0]
|
|
STMDB LR!, {R0}
|
|
|
|
; Store the new top of stack for the task.
|
|
LDR R1, =pxCurrentTCB
|
|
LDR R0, [R1]
|
|
STR LR, [R0]
|
|
|
|
ENDM
|
|
|
|
|
|
portRESTORE_CONTEXT MACRO
|
|
|
|
; Set the LR to the task stack.
|
|
LDR R1, =pxCurrentTCB
|
|
LDR R0, [R1]
|
|
LDR LR, [R0]
|
|
|
|
; The critical nesting depth is the first item on the stack.
|
|
; Load it into the ulCriticalNesting variable.
|
|
LDR R0, =ulCriticalNesting
|
|
LDMFD LR!, {R1}
|
|
STR R1, [R0]
|
|
|
|
; Get the SPSR from the stack.
|
|
LDMFD LR!, {R0}
|
|
MSR SPSR_cxsf, R0
|
|
|
|
; Restore all system mode registers for the task.
|
|
LDMFD LR, {R0-R14}^
|
|
NOP
|
|
|
|
; Restore the return address.
|
|
LDR LR, [LR, #+60]
|
|
|
|
; And return - correcting the offset in the LR to obtain the
|
|
; correct address.
|
|
SUBS PC, LR, #4
|
|
|
|
ENDM
|
|
|