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Re: x86-64 asm question

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Re: x86-64 asm question

Subject: Re: x86-64 asm question
From: Scott Lamb <email@hidden>
Date: Mon, 4 Sep 2006 16:56:06 -0700

On Sep 4, 2006, at 3:57 PM, Cyrus Harmon wrote:

So, using gas I'm trying to port some x86 assembly code that refers to an external symbol:
 .text
 .globl _all_threads
...
...
 mov _all_threads,%rax
...
the error  message I get is:
x86-64-assem.S:133:32-bit absolute addressing is not supported for x86-64

That works on x86 (well, with �x, of course), but I can't seem to figure out how to do this on x86-64, or any relevant docs on Apple's x86-64 assembler.

IIRC, x86_64 uses IP-relative addresses. And in a x64_64-linux project of mine, I found this line:

    movl    sigsafe_key_(%rip), �i

--
Scott Lamb <http://www.slamb.org/>


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