UWOP_PUSH_NONVOL unwind code entry for the specified register number using the current offset in the prologue.
.PUSHREG allows ml64.exe users to specify how a frame function unwinds, and is only allowed within the prologue, which extends from the PROC FRAME declaration to the .ENDPROLOG directive. These directives do not generate code; they only generate
.pdata. .PUSHREG should be preceded by instructions that actually implement the actions to be unwound. It is a good practice to wrap both the unwind directives and the code they are meant to unwind in a macro to ensure agreement.
register may be one of:
RAX | RCX | RDX | RBX | RDI | RSI | RBP | R8 | R9 | R10 | R11 | R12 | R13 | R14 | R15.
For more information, see MASM for x64 (ml64.exe).
The following sample shows how to push non-volatile registers.
; 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