Arm VERSION 1.2 Manual de usuario descargar pdf (Pagina 319)

100

101

Directives Reference

Example

p PROC ; Canonical frame address is sp + 0

EXPORT p

STMFD sp!,{r4-r6,lr}

; sp has moved relative to the canonical frame address,

; and registers r4, r5, r6 and lr are now on the stack

FRAME PUSH {r4-r6,lr}

; Equivalent to:

; FRAME ADDRESS sp,16 ; 16 bytes in {r4-r6,lr}

; FRAME SAVE {r4-r6,lr},-16

7.5.4 FRAME REGISTER

Use the

FRAME REGISTER

directive to maintain a record of the locations of function

arguments held in registers. You can only use it within functions with

FUNCTION

and

ENDFUNC

PROC

and

ENDP

directives.

Syntax

FRAME REGISTER reg1,reg2

where:

reg1

is the register that held the argument on entry to the function.

reg2

is the register in which the value is preserved.

Usage

Use the

FRAME REGISTER

directive when you use a register to preserve an argument that

was held in a different register on entry to a function.

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