问题
Fairly simple question this time. How do I write to screen the contents of a single register in Assembly? I'm getting a bit tired of calling DumpRegs just to see the value of one register.
I'm using x86 architecture, and MASM in Visual Studio, and Irvine32.lib.
回答1:
Irvines's DumpReg uses repeatedly a macro of Macros.inc: mShowRegister. It can be used directly. Example:
INCLUDE Irvine32.inc
INCLUDE Macros.inc
.code
main PROC
mov esi, 0DeadBeefh
mShowRegister ESI, ESI
exit
main ENDP
END main
A documented macro with more options is mShow. Example:
INCLUDE Irvine32.inc
INCLUDE Macros.inc
.code
main PROC
mov esi, 0DeadBeefh
mshow ESI, h
exit
main ENDP
END main
回答2:
Irvine32 has output functions that take a value in EAX, such as WriteDec (unsigned base 10).
See the documentation http://programming.msjc.edu/asm/help/source/irvinelib/writedec.htm which has links to WriteHex (hex = base 16), and WriteInt (signed base 10).
These functions use the Irvine32 calling convention and preserve all registers, including the arg-passing register EAX, so you can even insert them as a debug-print for EAX at least. More usually you'd use them as simply normal output functions.
Usually for asm debugging you'd use a debugger, not debug-print function calls.
来源：https://stackoverflow.com/questions/22181320/writing-out-a-single-register-in-assembly