src/sim/common ChangeLog sim-events.h

[vapier at sourceware dot org]

CVSROOT:	/cvs/src
Module name:	src
Changes by:	vapier@sourceware.org	2011-02-14 04:58:12

Modified files:
	sim/common     : ChangeLog sim-events.h 

Log message:
	sim: change to 64bit time keeping to avoid 32bit overflows
	
	The sim-events code jumps through some hoops to avoid using 64bit math
	to manage the current time.  One fundamental assumption here is that by
	constantly scheduling the sim poll event a short time into the future,
	the 64bit difference will always fall into a signed 32bit value.  This
	does work most of the time, except for when processing the sim poll event
	itself.
	
	Normally, sim_events_process() will dequeue the sim poll event, update
	the current time (time_from_event) according to the next pending event,
	process the sim poll event (which will then requeue the sim poll event),
	and then continue on.
	
	The problem here of course is that the current time is updated in that
	small window before the sim poll event gets a chance to reschedule itself.
	So if the 64bit difference between the current time and the next event
	does not fit into the signed 32bit value, time_from_event overflows, and
	the internal assert at the end of update_time_from_event() triggers.
	
	Since attempts at tweaking sim_events_process() logic introduced other
	subtle bugs (due to tangled assumptions between most pieces of the sim
	time keeping code), change the time_from_event to a real 64bit value.
	Tests on my system between a 32bit ELF and a 64bit ELF show no practical
	difference (it's all lost in the system noise).  Basically, I booted a
	Linux kernel to userspace and then paniced it; this gave me a constant
	sample size of about 18 million insns.
	
	This was noticed when simulating Blackfin Das U-Boot.  The simulated core
	timer is given the max unsigned timeout value possible on a 32bit processor
	(0xffffffff).  This timeout value is used directly to schedule a hw event
	in the sim future (the IRQ firing).  Once the sim poll event is kicked off,
	the next pending event is the core timer event which is more than 2^31
	ticks in the future, and the sim aborts with:
	sim-events.c:435: assertion failed - current_time == sim_events_time (sd)
	
	Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/sim/common/ChangeLog.diff?cvsroot=src&r1=1.235&r2=1.236
http://sourceware.org/cgi-bin/cvsweb.cgi/src/sim/common/sim-events.h.diff?cvsroot=src&r1=1.10&r2=1.11