Problem with allocation code x64

[haox...@gmail.com]

Hi! I have some problem with writing instruction at allocated memory:

Assembler a;
a.mov(qword_ptr_abs((void*)0x15FE70000),rbx);

After write code obtained like this:

48891C250000E73F  - mov [5FE70000],rbx

Should be like this:

48891DF9FFFEFF     - mov [15FE70000],rbx

What's the problem? Using Win7 x64 with VS2010. Target and project is x64-bit. Thanks!

[Petr Kobalíček]

Hi,

there is no absolute memory addressing in 64-bit mode except for using mov_ptr, you address is truncated to 32-bits in your case. If you need to store to an absolute location you should first move the pointer to register and then use that register as a base pointer. If you have a structure or data that is indexed you can use advanced addressing to keep address only in one register.

Hope that helps!

Best,

Petr

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[haox...@gmail.com]

Thanks for the quick answer, I'll try it...

在 2013年12月5日星期四UTC+8下午11时04分29秒，petr kobalicek写道：