ARM VERSION 1.2 - Manual (Page 324)

Directives Reference
7-42 Copyright © 2000, 2001 ARM Limited. All rights reserved. ARM DUI 0068B
7.5.9 FUNCTION or PROC
The FUNCTION directive marks the start of an ATPCS-conforming function. PROC is a
synonym for FUNCTION .
Syntax
label FUNCTION
Usage
Use FUNCTION to mark the start of functions. The assembler uses FUNCTION to identify the
start of a function when producing DWARF call frame information for ELF.
FUNCTION sets the canonical frame address to be sp, and the frame state stack to be empty.
Each FUNCTION directive must have a matching ENDFUNC directive. You must not nest
FUNCTION / ENDFUNC pairs, and they must not contain PROC or ENDP directives.
See also FRAME ADDRESS on page 7-34 to FRAME STATE RESTORE on page 7-41.
Example
dadd FUNCTION
EXPORT dadd
STMFD sp!,{r4-r6,lr}
FRAME PUSH {r4-r6,lr}
; subroutine body
LDMFD sp!,{r4-r6,pc}
ENDFUNC