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disassemble on Linux x64


Hi,

I try to disassemble a simple program on x64 Linux using GDB.

The test program is like:

 main()
 {
     getuid();
 }

"disassemble main" shows that getuid() corresponds to "callq addr". But when I try to "disassemble getuid" or "disassemble addr", GDB says it is not a vaild function address.

Why, while it is ok on x86 Linux? Is callq a new instruction added by
x86-64? What is the difference to the call instruction?

Another question: do I need to use a 32-bit GDB to debug 32-bit program?

Thanks,

Shen


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