Date: Fri, 6 Apr 2007 11:42:36 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: cihan <cihan@edu.enderunix.org> Cc: freebsd-hackers@freebsd.org Subject: Re: gcc plain binary format Message-ID: <20070406014236.GD842@turion.vk2pj.dyndns.org> In-Reply-To: <20070405225355.27230.qmail@istanbul.enderunix.org> References: <20070405225355.27230.qmail@istanbul.enderunix.org>
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--hQiwHBbRI9kgIhsi Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2007-Apr-06 01:53:54 +0300, cihan <cihan@edu.enderunix.org> wrote: >How can I convert c source code to plain binary file? What do you mean by "plain binary"? From the context, it looks like you want some sort of stand-alone executable but you don't say how you intend to run it. >But I give linker error like a "undefined reference to putchar" This implies that you have a reference to putchar() in foo.c - you will need to provide an implementation of it and the implementation will (of necessity) require knowledge of the execution environment. >ld -Ttext 0x0 -e main -s --oformat binary -o foo.bin foo.o -lc This won't work because libc in intended to work in an environment hosted on FreeBSD and needs infrastructure that is part of crt*.o Have a look in (eg) /usr/src/sys/boot/i386 for code that is intended to run without the kernel. --=20 Peter Jeremy --hQiwHBbRI9kgIhsi Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGFaWM/opHv/APuIcRAvgKAJ9/KkrEpAi+M7FN68pRZei4I07FqQCbBGED rl9vYKzmxquefLALKjduGBs= =iQyt -----END PGP SIGNATURE----- --hQiwHBbRI9kgIhsi--
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