From mboxrd@z Thu Jan 1 00:00:00 1970 From: ishare Subject: Re: how does ld.so call ELF's entry? Date: Sun, 7 Apr 2013 11:45:54 +0800 Message-ID: <20130407034554.GC9617@debian.localdomain> References: <20130407021921.GA9462@debian.localdomain> <20130407033913.GB9617@debian.localdomain> <6107E321-5746-4245-8C42-0C4E589BEE4A@ymail.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:date:from:to:cc:subject:message-id:references :mime-version:content-type:content-disposition:in-reply-to :user-agent; bh=zbnqn1CAal6pAgC/i+V+8kuqdRVq3K5KUx/JcsqEKO4=; b=InGXKFFYYevUyYSXjv6g/pxxaLmKAGHaiW5PPLafLz6z1Q3oj2C+8NmvCtjYGsRkqa DnDUjL3LcdFplKXQot4g2mLlop2cTRrn2hfWXc7Fap0Ci5oJ6BAN0+Bl7eZhbaJhxbjE BeWaPoa6QEzlhCkWkeHUynpNHk/1OdSNQaFzki9mc8mvAexrwgF/4PH+WnCY7Crnvw3N qdA7DO9osZtXxlRcDyZTd+XbZ2/MlxvHMr+BolyQqgnR7nGP5iYrXiV5xmJ8ec8ii/sk N4z4sA+vOMbuzMxV/c4OcAxNa+K1J8TBmOHTirVPgVFCQOBgMe9sZuue9OtFi9fbLH4f BkDQ== Content-Disposition: inline In-Reply-To: <6107E321-5746-4245-8C42-0C4E589BEE4A@ymail.com> Sender: linux-assembly-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Chris Evans Cc: linux-assembly@vger.kernel.org On Sat, Apr 06, 2013 at 08:43:16PM -0700, Chris Evans wrote: > With a far jump to entry offset How does it know the entry point's address? > > > Sent from my iPad > > On Apr 6, 2013, at 8:39 PM, ishare wrote: > > > On Sun, Apr 07, 2013 at 05:11:28AM +0200, Sofiane Akermoun wrote: > >> Hello, > >> > >> > >> The interpreter is specified during linking process and the program header > >> of your binary is filled with good values. > >> Then when the operating system load your binary, he finds next the > >> interpreter to use. > >> The linker ld sets the good values by default but you can overwrite it or > >> specify other values if you want. > >> The steps are: > >> 1)The operating system loads your binary > >> 2)The program loader system execute the Interpreter specifiy in the binary > >> 3)The interpreter gather all the dynamic libraries needed in memory > > > > > >> 4)The Control is passed to the entry point of your program > > > > How does the step 4 been done ? > > > > thanks! > >> > >> The entry point is specified in your code source as a "global". And could > >> be find in your object file by the linker. > >> In theory there are some default tag to specify entry point, like "..start" > >> for nasm, but you can also passed it to the linker. > >> > >> regards, > >> > >> Sofiane Akermoun > >> akersof@gmail.com > >> > >> > >> > >> > >> > >> 2013/4/7 ishare > >> > >>> > >>> For an ELF ,which needs a interpreter , how is it been called by the > >>> interpreter ? > >>> > >>> As I know the interpreter is loaded first and do something essential > >>> ,then call the main routine of ELF . > >>> How is this procedure implemented ? > >>> > >>> Thanks! > >>> -- > >>> To unsubscribe from this list: send the line "unsubscribe linux-assembly" > >>> in > >>> the body of a message to majordomo@vger.kernel.org > >>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >> > >> > >> > >> -- > >> Sofiane AKERMOUN > >> akersof@gmail.com > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-assembly" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html