On 09/25/16 23:53, Bruce Evans wrote: > On Sun, 25 Sep 2016, Colin Percival wrote: >> On 09/25/16 11:39, Bruce Evans wrote: >>> Author: bde >>> Date: Sun Sep 25 18:39:24 2016 >>> New Revision: 306319 >>> URL: https://svnweb.freebsd.org/changeset/base/306319 >>> >>> Log: >>> Minor fixes for 160-bit disassembly: >> >> I thought the x86 architecture was limited to 120-bit instructions? > > Oops. > > Is 120 the exact limit on instruction length is is that just for prefixes? > I think the instruction fetch pipeline was 16 bytes, but it is now often > 32 or 64.
Traditionally x86 CPUs would generate an invalid-opcode fault if redundant instruction prefixes resulted in an instruction exceeding 15 bytes. This behaviour might have changed in the past two decades, but I doubt it. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
