From: Richard Jones <rich@annexia.org>
To: Adrien <camaradetux@gmail.com>
Cc: Caml Mailing List <caml-list@yquem.inria.fr>
Subject: Re: [Caml-list] Binding C libraries which use variable arguments (stdarg.h)
Date: Sun, 1 Nov 2009 20:06:48 +0000 [thread overview]
Message-ID: <20091101200648.GB15428@annexia.org> (raw)
In-Reply-To: <666572260911010658r2eb8bdfbl9b06222079869c7b@mail.gmail.com>
On Sun, Nov 01, 2009 at 03:58:47PM +0100, Adrien wrote:
> Unfortunately I don't know much about asm, I tried to check but failed
> (couldn't find what "leaq" meant).
The 'q' just means it's a Long Mode instruction (ie. x86-64's 64 bit
mode). The instruction itself is "Load Effective Address" - it means
it does an address calculation as if you were going to load/store
something at that address, but instead puts the address itself (result
of that calculation) in the target register.
If I remember my rusty x86 assembler correctly, then:
movl 4(%ebx),%eax ; load 4 bytes of data from address %ebx + 4, put in %eax
lea 4(%ebx),%eax ; add %ebx + 4 and put that in %eax
Rich.
--
Richard Jones
Red Hat
next prev parent reply other threads:[~2009-11-01 20:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-28 22:07 Adrien
2009-10-28 22:45 ` Basile STARYNKEVITCH
2009-10-29 8:55 ` Goswin von Brederlow
2009-10-29 21:37 ` Adrien
2009-10-29 23:31 ` Goswin von Brederlow
2009-10-29 21:18 ` Adrien
2009-10-30 9:35 ` Xavier Leroy
2009-11-01 9:31 ` Adrien
2009-11-01 11:07 ` Florian Weimer
2009-11-01 12:12 ` Adrien
2009-11-01 12:16 ` Florian Weimer
2009-11-01 14:58 ` Adrien
2009-11-01 20:06 ` Richard Jones [this message]
2009-11-03 19:33 ` Florian Weimer
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