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From: "jj shen" <kbottle@gmail.com>
To: gdb@sourceware.org
Subject: disassemble on Linux x64
Date: Thu, 03 May 2007 19:57:00 -0000	[thread overview]
Message-ID: <293b12a20705031257x595cda47t1f87e1aa719e486d@mail.gmail.com> (raw)
In-Reply-To: <293b12a20705031255u1d211aa3hec1c464566d16b1f@mail.gmail.com>

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


       reply	other threads:[~2007-05-03 19:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <293b12a20705031255u1d211aa3hec1c464566d16b1f@mail.gmail.com>
2007-05-03 19:57 ` jj shen [this message]
2007-05-03 20:10   ` Daniel Jacobowitz

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