Date: Tue, 20 Jul 2010 15:48:57 -0500 From: Nathan Whitehorn <nwhitehorn@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: amd64@freebsd.org, freebsd-arch@freebsd.org Subject: Re: uname -m/-p for compat32 binaries Message-ID: <4C460BB9.1060009@freebsd.org> In-Reply-To: <201007200907.24715.jhb@freebsd.org> References: <20100719213054.GB2381@deviant.kiev.zoral.com.ua> <201007200907.24715.jhb@freebsd.org>
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On 07/20/10 08:07, John Baldwin wrote: > On Monday, July 19, 2010 5:30:54 pm Kostik Belousov wrote: > >> Hi, >> I intend to commit the following change, that makes sysctls >> hw.machine_arch and hw.machine to return "i386" for 32 bit >> binaries run on amd64. In particular, 32 bit uname -m and uname -p >> print "i386", that is good for i386 jails on amd64 kernels. >> >> I find the change very useful for me, but I wonder why such trivial >> modification is not yet done. Can anybody note a possible fallout from >> it ? >> > Presumably ia64 and powerpc64 would need a similar change as well? It looks > fine to me. I suspect Y! used the UNAME_* approach as it didn't add yet- > another local diff to maintain in the kernel, and the uname fixes at Y! might > have predated SCTL_MASK32. > Maybe it makes sense to define a MACHINE_ARCH32 in machine/param.h, as is done for ELF_ARCH32 in machine/elf.h? This would keep the MI code in the kernel MI, and ever-so-slightly simplify implementation for ia64, mips, and powerpc64. Thanks for doing this! -Nathan
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