PROC
Visual Studio 2005
Marks start and end of a procedure block called label. The statements in the block can be called with the CALL instruction or INVOKE directive.
label PROC [[distance]] [[langtype]] [[visibility]] [[<prologuearg>]]
[[USES reglist]] [[, parameter [[:tag]]]]...
[FRAME [:ehandler-address] ]
statements
label ENDP
[FRAME [:ehandler-address] ] is only valid with ml64.exe, and causes MASM to generate a function table entry in .pdata and unwind information in .xdata for a function's structured exception handling unwind behavior.
When the FRAME attribute is used, it must be followed by an .ENDPROLOG directive.
See MASM for x64 (ml64.exe) for more information on using ml64.exe.
; ml64 ex1.asm /link /entry:Example1 /SUBSYSTEM:CONSOLE _text SEGMENT Example1 PROC FRAME push r10 .pushreg r10 push r15 .pushreg r15 push rbx .pushreg rbx push rsi .pushreg rsi .endprolog ; rest of function ... ret Example1 ENDP _text ENDS END
The above code will emit the following function table and unwind information:
FileHeader->Machine 34404
Dumping Unwind Information for file ex2.exe
.pdata entry 1 0x00001000 0x00001023
Unwind data: 0x00002000
Unwind version: 1
Unwind Flags: None
Size of prologue: 0x08
Count of codes: 3
Frame register: rbp
Frame offset: 0x0
Unwind codes:
Code offset: 0x08, SET_FPREG, register=rbp, offset=0x00
Code offset: 0x05, ALLOC_SMALL, size=0x10
Code offset: 0x01, PUSH_NONVOL, register=rbp
