how does uses work exactly?

[ecube]

test proc uses ecx eax


?

[hutch--]

cube,

The USES notation automates the preervation of registers in and out of a procedure including multiple exit locations in that procedure. If you have,

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USES ESI EDI    ; in your procedure

push esi
push edi

; then anywhere where there is a RET

pop edi
pop esi


Personally I would recommend learning how to use them manually as you get cleaner exits and you can use a single exit as a collector to avoid duplication.