Date: Thu, 30 Sep 1999 14:43:41 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: Alan Cox <alc@cs.rice.edu> Cc: current@freebsd.org Subject: Re: Now that sigcontext is gone ... Message-ID: <XFMail.990930144341.jdp@polstra.com> In-Reply-To: <19990930162834.C20978@nonpc.cs.rice.edu>
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Alan Cox wrote: > /* kludge to pass faulting virtual address to sendsig */ > frame->tf_err = eva; > > return((rv == KERN_PROTECTION_FAILURE) ? SIGBUS : SIGSEGV); > } > > Up until this point, frame->tf_err tells me details about the page > fault, such as whether it was a read or a write access. I'd really > like that information to make it out to user-level in addition > to the faulting address. In other words, we should find another > way to pass the faulting address to sendsig than by overwriting > frame->tf_err. Sounds reasonable to me. > P.S. This also reminds me that FreeBSD is non-standard relative > to Linux and all of the major vender commercial Unices in that a disallowed > access, such as a write to a read-only region of memory, generates > a SIGBUS rather than a SIGSEGV. Yes, this even violates the 1996 POSIX spec. John --- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "No matter how cynical I get, I just can't keep up." -- Nora Ephron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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