this interface has been like this from the pre-git days, and I did not track down the specific version it was added to its present location (it was once in sysfs) On Sat, 2012-08-04 at 13:46 -0700, Shawn Landden wrote: > --- > man2/prctl.2 | 7 +++++-- > man5/proc.5 | 21 ++++++++++++++++++++- > 2 files changed, 25 insertions(+), 3 deletions(-) > > diff --git a/man2/prctl.2 b/man2/prctl.2 > index f4db191..b68bea2 100644 > --- a/man2/prctl.2 > +++ b/man2/prctl.2 > @@ -44,7 +44,7 @@ > .\" 2012-08-03 Shawn Landden, Document PR_SET_NO_NEW_PRIVS, PR_GET_NO_NEW_PRIVS, > .\" SECCOMP_MODE_STRICT, SECCOMP_MODE_FILTER > .\" (thx Andy Lutomirski <luto@xxxxxxxxxxxxxx> 259e5e6c) > -.\" PR_SET_TIMERSLACK, PR_GET_TIMESLACK > +.\" PR_SET_TIMERSLACK, PR_GET_TIMESLACK, ARM alignment trap handler > .\" > .TH PRCTL 2 2012-08-03 "Linux" "Linux Programmer's Manual" > .SH NAME > @@ -406,7 +406,10 @@ Pass > \fBPR_UNALIGN_NOPRINT\fP to silently fix up unaligned user accesses, > or \fBPR_UNALIGN_SIGBUS\fP to generate > .B SIGBUS > -on unaligned user access. > +on unaligned user access. ARM is set system-wide via /proc/cpu/alignment (see > +.IR Documentation/arm/mem_alignment > +or > +.BR proc (5)). > .TP > .B PR_GET_UNALIGN > (see > diff --git a/man5/proc.5 b/man5/proc.5 > index 2ba1daa..e7ca611 100644 > --- a/man5/proc.5 > +++ b/man5/proc.5 > @@ -58,7 +58,7 @@ > .\" to see what information could be imported from that file > .\" into this file. > .\" > -.TH PROC 5 2012-05-03 "Linux" "Linux Programmer's Manual" > +.TH PROC 5 2012-08-04 "Linux" "Linux Programmer's Manual" > .SH NAME > proc \- process information pseudo-file system > .SH DESCRIPTION > @@ -1229,6 +1229,25 @@ cat /lib/modules/$(uname \-r)/build/.config > is only provided if the kernel is configured with > .BR CONFIG_IKCONFIG_PROC . > .TP > +.IR /proc/cpu/alignment " (ARM only)" > +Set the behavior of the user-mode alignment trap handler. When writing, takes a > +number that is the sum of the fallowing: 1, print message to syslog; (signal) 2, > +fix up the user process performing the unaligned access; (fixup) 4, send a > +.BR SIGBUS > +signal ( > +.BR SIGILL > +before 2.6.35) to the user process performing the unaligned access. (signal) > +Signal and fixup cannot be used together. On armv6+ either fixup or signal must > +be used, to prevent possible deadlock. > + > +Reading will provide statistics on fixups performed since boot in user and > +system mode, as well as the current user-mode trap behavior. > + > +Other architectures set this behavior on a per-process level, via > +.B prctl(PR_SET_UNALIGN). > +See > +.BR prctl (2). > +.TP > .I /proc/cpuinfo > This is a collection of CPU and system architecture dependent items, > for each supported architecture a different list. -- -Shawn Landden -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
