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Dear C2000 expert,
The DCL source code show a method of enabling shadowed context save/restore, but this feature is disable by default, can you please help me know if it have risks of using shadowed context save/restore?
And I didn't find the description about SAVE&RESTORE instruction, can you please me know which docs have demonstrate those 2 instructions?
FASTCR_DF22_C3 .set 0 ; set to 1 to enable shadowed context save/restore
_DCL_runDF22_C3:
.asmfunc
.if FASTCR_DF22_C3 = 0
MOV32 *SP++, R4H
MOV32 *SP++, R5H
MOV32 *SP++, R6H
MOV32 *SP++, R7H
.else
SAVE
.endif
The SAVE/RESTORE instruction are documented in the below document. There is only one set of shadow register for fast context save / restore of FPU registers. Hence you cannot do multiple level of save before calling restore.
The SAVE and RESTORE instructions should be used in high-priority interrupts. That is interrupts that cannot themselves be interrupted.
