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Alfred Gedeon 2020-07-01 22:27:40 -07:00 • committed by alfred gedeon
parent a5dbc2b1de
commit 718178c68a
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126
portable/IAR/AtmelSAM9XE/ISR_Support.h
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@ -1,78 +1,96 @@
EXTERN pxCurrentTCB
EXTERN ulCriticalNesting
EXTERN pxCurrentTCB
EXTERN ulCriticalNesting
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Context save and restore macro definitions
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
Context save and restore macro definitions
;
portSAVE_CONTEXT MACRO
; Push R0 as we are going to use the register.
STMDB SP!, {R0}
;
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}
;
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}
;
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}
Now we have saved LR we can use it instead of R0.
MOV LR, R0
; Push all the system mode registers onto the task stack.
STMDB LR, {R0-LR}^
NOP
SUB LR, LR, #60
;
Pop R0 so we can save it onto the system mode stack.
LDMIA SP !, { R0 }
; Push the SPSR onto the task stack.
MRS R0, SPSR
STMDB LR!, {R0}
;
Push all the system mode registers onto the task stack.
STMDB LR, { R0 - LR } ^
NOP
SUB LR, LR, # 60
LDR R0, =ulCriticalNesting
LDR R0, [R0]
STMDB LR!, {R0}
;
Push the SPSR onto the task stack.
MRS R0, SPSR
STMDB LR !, { R0 }
; Store the new top of stack for the task.
LDR R1, =pxCurrentTCB
LDR R0, [R1]
STR LR, [R0]
LDR R0, = ulCriticalNesting
LDR R0, [ R0 ]
STMDB LR !, { R0 }
ENDM
;
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]
;
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]
;
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
;
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 all system mode registers for the task.
LDMFD LR, { R0 - R14 } ^
NOP
; Restore the return address.
LDR LR, [LR, #+60]
;
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
And return -correcting the offset in the LR to obtain the
;
correct address.
SUBS PC, LR, # 4
ENDM