Date: Mon, 18 Sep 2000 21:51:05 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Bruce Evans <bde@zeta.org.au> Cc: Matthew Jacob <mjacob@feral.com>, "Matthew N. Dodd" <mdodd@freebsd.org>, cvs-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern subr_bus.c Message-ID: <Pine.BSF.4.21.0009182150270.86297-100000@salmon.nlsystems.com> In-Reply-To: <Pine.BSF.4.21.0009190145470.17074-100000@besplex.bde.org>
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On Tue, 19 Sep 2000, Bruce Evans wrote: > On Mon, 18 Sep 2000, Matthew Jacob wrote: > > > Yeah, I wondered about that too. I thought > > > > int foo; > > > > and > > > > int foo=0; > > > > were supposed to be the same. Is the kernel now forgetting to clear bss? > > Same for the C abstract machine, which we mostly depend on in the > kernel (although the kernel is not entirely implementable in C). Of > course, it is an implementation detail that the explicit initialization > puts the variable in the data section instead of in the bss, at least > for gcc on i386's. > > The bss clearing code hasn't changed for years on i386's. I can't see > where the bss is cleared on alphas (alpha_init is called very early > in locore.s). The bss is cleared by the loader for both x86 and alpha. I guess x86 clears it again in locore but it doesn't need to. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 20 8348 3944 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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