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154
portable/IAR/STR91x/ISR_Support.h
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@ -26,80 +26,126 @@
*
*/
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
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
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
}
; Get the SPSR from the stack.
LDMFD LR!, {R0}
MSR SPSR_cxsf, R0
STR R1, [ R0 ]
; Restore all system mode registers for the task.
LDMFD LR, {R0-R14}^
NOP
;
Get the SPSR from the stack.
LDMFD LR !, {
R0
}
MSR SPSR_cxsf, R0
; Restore the return address.
LDR LR, [LR, #+60]
;
Restore all system mode registers
; And return - correcting the offset in the LR to obtain the
; correct address.
SUBS PC, LR, #4
for the task.
LDMFD LR, {
R0 - R14
}
ENDM
^
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