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Arm Compiler armasm User Guide : FRAME SAVE


The FRAME SAVE directive describes the location of saved register contents relative to the canonical frame address.


FRAME SAVE {reglist}, offset



is a list of registers stored consecutively starting at offset from the canonical frame address. There must be at least one register in the list.


You can only use FRAME SAVE within functions with FUNCTION and ENDFUNC or PROC and ENDP directives.

Use it immediately after the callee stores registers onto the stack.

reglist can include registers which are not required for backtracing. The assembler determines which registers it requires to record in the DWARF call frame information.


If your code uses a single instruction to save registers and alter the stack pointer, you can use FRAME PUSH instead of using both FRAME SAVE and FRAME ADDRESS.