从Masm 64调用C函数 [英] Calling C function from masm 64

问题描述

我的汇编代码有问题(在Win8 64上的Visual 2013中为64位错误).当我调用C函数(printf)时，它将引发ntdll.dll的异常.我做错了什么?如何在64位错误中从控制台读取和写入数据?在哪里可以找到有关masm 64位的好的教程?

I have a problem with my assembly code (64 bit masm in Visual 2013 on win8 64). When I'm calling C function (printf), it throwing exception from ntdll.dll. What I'm doing wrong? How I can read and write data from console in 64 bit masm? Where I can find good tutorial for masm 64 bit?

extrn printf : proc
.data
format byte "Arg1: %d", 10, 0

.code
printData proc

mov rbx, 100
push rbx

lea rax, format; format address
push rax

call printf; throw unhandled exception ntdll.dll - Access violation reading location 0xFFFFFFFFFFFFFFFF.
add rsp, 16 ;2* 64bit value

ret
printData endp
end

P.S我正在从C ++代码调用printData.

P.S I'm calling printData from C++ code.

推荐答案

The Windows x64 calling convention requires you to pass arguments starting in RCX, followed by RDX, R8 and R9 if needed. In this case you probably just need RCX to store the address of format, and RDX the integer value you want to print.

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