CVS log for src/sys/arch/cesfic/cesfic/trap.c

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Default branch: MAIN

Largely unify the <machine/cpu.h> headers on the m68k platforms.

Arrange to update cached LWP credentials in userret() rather than during
syscall/trap entry, eliminating a test+branch on every syscall/trap.

This wasn't possible in the 3.99.x timeframe when l->l_cred came about
because there wasn't a reliable/timely way to force an ONPROC LWP running on
a remote CPU into the kernel (which is just about the only new thing in
this scheme).

Call cnpollc(9) before cngetc(9) as the cons(9) man page says.

Affects only inside #ifdef DEBUG part on "trap during panic" in trap.c
derived from hp300.

Merge changes from current as of 20200406

mi_userret(): take care of calling preempt(), set spc_curpriority directly,
and remove MD code that does the same.

Sync with HEAD

Overhaul the API used to fetch and store individual memory cells in
userspace.  The old fetch(9) and store(9) APIs (fubyte(), fuword(),
subyte(), suword(), etc.) are retired and replaced with new ufetch(9)
and ustore(9) APIs that can return proper error codes, etc. and are
implemented consistently across all platforms.  The interrupt-safe
variants are no longer supported (and several of the existing attempts
at fuswintr(), etc. were buggy and not actually interrupt-safe).

Also augmement the ucas(9) API, making it consistently available on
all plaforms, supporting uniprocessor and multiprocessor systems, even
those that do not have CAS or LL/SC primitives.

Welcome to NetBSD 8.99.37.

Refactor the 68040 writeback() from each m68k port's trap handler into a
shared copy: m68040_writeback().  It is essentially a copy of the Atari
version, with some minor cosmetic tweaks and one small performance optimization
from the mvme68k port.

Tested by rjs@ on a Quadra 950.  (Thanks!)

update from HEAD

Sync with HEAD

Handle EINVAL in the fault path and send SIGBUS on mmap'd access past EOF

sync with head

sync to -current.

Remove COMPAT_SA / KERN_SA.  Welcome to 6.99.3!
Approved by core@.

Sync with HEAD.

sync with head

Sync with HEAD

Remove clause 3 (UCB advertising clause) from the University of Utah
copyright.  Confirmed by Mike Hibler, mike at cs.utah.edu - thanks!
Also, merge UCB and Utah copyright texts back into one, as they
originally were.

Extra verification by snj@.

Explicitly include <machine/pcb.h> for struct pcb.

Move counting of faults, traps, intrs, soft[intr]s, syscalls, and nswtch
from uvmexp to per-cpu cpu_data and move them to 64bits.  Remove unneeded
includes of <uvm/uvm_extern.h> and/or <uvm/uvm.h>.

Sync with HEAD.

sync with head.

implement ucas_* for m68k.

sync with head

fix PR 6724 - convert m68k options to defflag's.  this means that
M680[12346] are now available from opt_m68k_arch.h.  FPSP meantioned
in the PR has already been fixed, and i could not find any more.

i built these kernels to ensure i did not break their builds:

amiga: GENERIC DRACO
atari: HADES FALCON MILAN-PCIIDE
mac68k: GENERIC
sun2: GENERIC
sun3: GENERIC GENERIC3X
cesfic: attempted GENERIC, does not build due to lack of machine/bus.h
hp300: GENERIC
luna68k: GENERIC
mvme68k: GENERIC
news68k: GENERIC
next68k: GENERIC
x68k: GENERIC

sync with head

Sync with HEAD.

fix copy{in,out}{,str}() to return the error returned by uvm_fault().
fixes PR 41813.

sync with head

Use lwp_getpcb() on m68k ports, clean from struct user usage.

kill extra whitespaces
reviewed by tsutsui@

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

bcopy -> memcpy

ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.

Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)

Remove all the __P() from sys (excluding sys/dist)
Diff checked with grep and MK1 eyeball.
i386 and amd64 GENERIC and sys still build.

Sync with HEAD.

Pull up following revision(s) (requested by martin in ticket #332):
	sys/arch/amiga/amiga/trap.c: revision 1.122
	sys/arch/atari/atari/trap.c: revision 1.99
	sys/arch/cesfic/cesfic/trap.c: revision 1.43
	sys/arch/hp300/hp300/trap.c: revision 1.140
	sys/arch/luna68k/luna68k/trap.c: revision 1.55
	sys/arch/m68k/include/signal.h: revision 1.25
	sys/arch/m68k/m68k/sig_machdep.c: revision 1.41
	sys/arch/mac68k/mac68k/trap.c: revision 1.136 via patch
	sys/arch/mvme68k/mvme68k/trap.c: revision 1.98
	sys/arch/news68k/news68k/trap.c: revision 1.60
	sys/arch/next68k/next68k/trap.c: revision 1.75
	sys/arch/sun2/sun2/trap.c: revision 1.37
	sys/arch/sun3/sun3/trap.c: revision 1.136
	sys/arch/x68k/x68k/trap.c: revision 1.97
Centralize fpu exception to siginfo code encoding for all m68k archs,
fixes a failure in the lib/libc/ieeefp/except regression test.

Centralize fpu exception to siginfo code encoding for all m68k archs,
fixes a failure in the lib/libc/ieeefp/except regression test.

Sync with HEAD.

Sync with HEAD.

Merge wrstuden-revivesa into HEAD.

Change how we make SA threads not generate upcalls. Instead of clearing
LW_SA, use a private flag, LP_SA_NOBLOCK, that we set when we want
to not generate upcalls. This means we do NOT need to lock (l)
(ourselves) to set it.

Adjust tests that look at LW_SA. Now, we are an upcall-generating
lwp if ((l->l_flag & LW_SA) && (~l->l_pflag & LP_SA_NOBLOCK)).

Introduce code pattern to set & remember this:

	f = ~l->l_pflag & LP_SA_NOBLOCK;
	l->l_pflag |= LP_SA_NOBLOCK;

	...

	/* f is now LP_SA_NOBLOCK if it wasn't set in l_pflag before */

	l->l_pflag ^= f;

I updated a lot of the trap handlers to do trap handling iff LP_SA_NOBLOCK
is not set. I tried to figure out if the trap handler could be triggered
for user-based faults as opposed to kernel faults to user addresses, and
only look at LP_SA_NOBLOCK for the latter.

Above is a result of discussions with rmind at to reduce lock twiddling.

Also, per same discussions, add locking to sys_sa_preempt(). p_lock is
the lock we want.

Also, per same discussions, remove use of LSSUSPENDED as a thread state.
We needed to use it when we were emulating the 4.X and previous behavior
of hiding cached threads. For the moment, we now have them instead
remain visible to all and have them sleeping on the "lwpcache" wait
channel.

sa_newcachelwp(): sa_putcachelwp() wants savp_mutex held, not p_lock.

Tweak some comments.

Re-add cpu_upcall() and page fault code. i386 kernels now compile.
They don't boot, but that seems to be a consequence of current from the
day this branch was started.

Sync with HEAD.

sync with head.

Per discussion with ad at n dot o, revert signal mask handling
changes.

The l_sigstk changes are most likely totally un-needed as SA will
never use a signal stack - we send an upcall (or will as other
diffs are brought in).

The l_sigmask changes were too controvertial. In all honesty, I
think it's probably best to revert them. The main reason they were
there is the fact that in an SA process, we don't mask signals per
kernel thread, we mask them per user thread. In the kernel, we want
them all to get turned into upcalls. Thus the normal state of
l_sigmask in an SA process is for it to always be empty.

While we are in the process of delivering a signal, we want to
temporarily mask a signal (so we don't recursively exhaust our
upcall stacks). However signal delivery is rare (important, but
rare), and delivering back-to-back signals is even rarer. So rather
than cause every user of a signal mask to be prepared for this very
rare case, we will just add a second check later in the signal
delivery code. Said change is not in this diff.

This also un-compensates all of our compatability code for dealing
with SA. SA is a NetBSD-specific thing, so there's no need for
Irix, Linux, Solaris, SVR4 and so on to cope with it.

As previously, everything other than kern_sa.c compiles in i386
GENERIC as of this checkin. I will switch to ALL soon for compile
testing.

Initial checkin of re-adding SA. Everything except kern_sa.c
compiles in GENERIC for i386. This is still a work-in-progress, but
this checkin covers most of the mechanical work (changing signalling
to be able to accomidate SA's process-wide signalling and re-adding
includes of sys/sa.h and savar.h). Subsequent changes will be much
more interesting.

Also, kern_sa.c has received partial cleanup. There's still more
to do, though.

Merge proc::p_mutex and proc::p_smutex into a single adaptive mutex, since
we no longer need to guard against access from hardware interrupt handlers.

Additionally, if cloning a process with CLONE_SIGHAND, arrange to have the
child process share the parent's lock so that signal state may be kept in
sync. Partially addresses PR kern/37437.

Sync with HEAD.

sync with head

sync with HEAD

Sync with HEAD

Remove COMPAT_HPUX.

Sync with HEAD.

Sync with HEAD.

sync with head

Sync with HEAD.

Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

sync with head.

Sync with HEAD

sync with HEAD

Sync with HEAD.

Don't set l_usrpri / spc_curpriority here. mi_userret() does it.

Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree.  Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches.  The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Sync with head.

Sync with HEAD

Sync with somewhat-recent netbsd-4.

Pull up following revision(s) (requested by mhitch in ticket #866):
	sys/arch/atari/atari/trap.c:		1.92
	sys/arch/mac68k/mac68k/trap.c:		1.129
	sys/arch/amiga/amiga/trap.c:		1.116
	sys/arch/mvme68k/mvme68k/trap.c:	1.91
	sys/arch/news68k/news68k/trap.c:	1.54
	sys/arch/sun3/sun3/trap.c:		1.131
	sys/arch/next68k/next68k/trap.c:	1.68
	sys/arch/luna68k/luna68k/trap.c:	1.47
	sys/arch/cesfic/cesfic/trap.c:		1.36
	sys/arch/x68k/x68k/trap.c:		1.90
	sys/arch/hp300/hp300/trap.c:		1.132
68030 and 68040 processors consider the read portion of a read-modify-write
transfer as a write to ensure the memory is writable before starting any
transfer.  The fault status information does not reflect this in the 'read'
status bit (i.e. it shows up as a read access), so faults with a RMW access
to non-writable memory was not getting the correct protection.  The page would
be read-only and the instruction would fault over and over.
A specific example is when a process forks, and the child process attempts
to execute a RMW access to a data page, which is read-only because it's CoP
Copy-On-Write.
When checking if the page needs to be writablek, also check the locked transfer
and treat any locked transfer as a write.
68060 already handled this correctly, since it has separate read and write
fault bits, and both are set on a RMW access and the trap code was checking
the write status bit.
Fixes PR#36848.

Sync with HEAD.

sync with head.

Sync with HEAD.

Sync w/ NetBSD-4-RC_1

68030 and 68040 processors consider the read portion of a read-modify-write
transfer as a write to ensure the memory is writable before starting any
transfer.  The fault status information does not reflect this in the 'read'
status bit (i.e. it shows up as a read access), so faults with a RMW access
to non-writable memory was not getting the correct protection.  The page would
be read-only and the instruction would fault over and over.

A specific example is when a process forks, and the child process attempts
to execute a RMW access to a data page, which is read-only because it's CoP
Copy-On-Write.

When checking if the page needs to be writablek, also check the locked transfer
and treat any locked transfer as a write.

68060 already handled this correctly, since it has separate read and write
fault bits, and both are set on a RMW access and the trap code was checking
the write status bit.

Fixes PR#36848.

Sync with head.

Sync with head.

Sync with HEAD.

Pull up following revision(s) (requested by mhitch in ticket #728):
	sys/arch/mvme68k/mvme68k/locore.s: revision 1.98
	sys/arch/mac68k/mac68k/trap.c: revision 1.128
	sys/arch/next68k/next68k/locore.s: revision 1.48
	sys/arch/mac68k/mac68k/locore.s: revision 1.152
	sys/arch/sun3/sun3/locore.s: revision 1.88
	sys/arch/sun2/sun2/locore.s: revision 1.19
	sys/arch/sun2/sun2/trap.c: revision 1.32
	sys/arch/m68k/m68k/db_trace.c: revision 1.51
	sys/arch/mvme68k/mvme68k/trap.c: revision 1.90
	sys/arch/news68k/news68k/trap.c: revision 1.53
	sys/arch/luna68k/luna68k/locore.s: revision 1.27
	sys/arch/atari/atari/locore.s: revision 1.99
	sys/arch/sun3/sun3/trap.c: revision 1.130
	sys/arch/x68k/x68k/trap.c: revision 1.89
	sys/arch/next68k/next68k/trap.c: revision 1.67
	sys/arch/x68k/x68k/locore.s: revision 1.79
	sys/arch/news68k/news68k/locore.s: revision 1.43
	sys/arch/luna68k/luna68k/trap.c: revision 1.46
	sys/arch/hp300/hp300/locore.s: revision 1.140
	sys/arch/cesfic/cesfic/locore.s: revision 1.15
	sys/arch/cesfic/cesfic/trap.c: revision 1.35
	sys/arch/m68k/m68k/trap_subr.s: revision 1.12
	sys/arch/amiga/amiga/locore.s: revision 1.143
Pass a frame pointer to trap() rather than the 'entire frame' trick.  Gcc4
was optimizing away modifications to the frame contents (it's not nice to
trick gcc).  Pass the pointer as the first argument to reduce the number
of places that would be changed otherwise.  Fixes the getcwd regression
test on most m68k ports.

Pass a frame pointer to trap() rather than the 'entire frame' trick.  Gcc4
was optimizing away modifications to the frame contents (it's not nice to
trick gcc).  Pass the pointer as the first argument to reduce the number
of places that would be changed otherwise.  Fixes the getcwd regression
test on most m68k ports.

Sync with head.

Update to HEAD.

Adapt rest of m68k ports to yamt-idlelwp. Compile tested only.

Sync with HEAD.

MI softintr(9)'fy. Untested.

This port needs much more cleanups, it seems...

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

- sync with head.
- move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.

sync with head.

TRUE -> true, FALSE -> false

Merge newlock2 to head.

Update m68k pasteware.

Remove support for SA. Ok core@.

sync with head.

sync with head

sync with head

Use the LWP cached credentials where sane.

- Hold a reference to the process credentials in each struct lwp.
- Update the reference on syscall and user trap if p_cred has changed.
- Collect accounting flags in the LWP, and collate on LWP exit.

sync with head.

Sync with head.

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

sync with head.

- include kauth.h for kauth_cred_geteuid.
- tweak indent for a long line.

integrate kauth.

Sync with head.

sync with head - hopefully this will work

sync with head.

adapt to uvm_fault() interface cleanup: kill the useless 3rd argument

sync with head.

Adapt to kernel authorization KPI.

I expect *some* lossage here...

file trap.c was added on branch elad-kernelauth on 2006-03-08 00:43:06 +0000

Clean up fallout proc_is_traced_p() change:
- proc_is_traced_p() -> trace_is_enabled(), to match trace_enter() and
  trace_exit().
- trace_is_enabled() becomes a real function.
- Remove unnecessary include files from various files that used to care
  about KTRACE and SYSTRACE, but do no more.

sync with head.

Fix some typos.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Adapt to compiling with -Wcast-qual by adding consts.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

use uvm_grow() to update stack segment size on stack page fault instead
of MD code

Sync with HEAD

add kernel part of concurrency support for SA on MP systems
- move per VP data into struct sadata_vp referenced from l->l_savp
  * VP id
  * lock on VP data
  * LWP on VP
  * recently blocked LWP on VP
  * queue of LWPs woken which ran on this VP before sleep
  * faultaddr
  * LWP cache for upcalls
  * upcall queue
- add current concurrency and requested concurrency variables
- make process exit run LWP on all VPs
- make signal delivery consider all VPs
- make timer events consider all VPs
- add sa_newsavp to allocate new sadata_vp structure
- add sa_increaseconcurrency to prepare new VP
- make sys_sa_setconcurrency request new VP or wakeup idle VP
- make sa_yield lower current concurrency
- set sa_cpu = VP id in upcalls
- maintain cached LWPs per VP

Remove obsolete comments about curproc.

Extend the #ifdef M68040 so that the `sig' variable declaration is moved
in as well, as it's otherwise not used. (from atari/atari/trap.c and
x68k/x68k/trap.c)

Reduce code duplication by adding mi_userret() in sys/userret.h
containing signal posting, kernel-exit handling and sa_upcall processing.

XXX the pc532, sparc, sparc64 and vax ports should have their
XXX userret() code rearranged to use this.

* Shuffle some data structures so, and add a flags word to ksiginfo_t.
  Right now the only flag is used to indicate if a ksiginfo_t is a
  result of a trap.  Add a predicate macro to test for this flag.
* Add initialization macros for ksiginfo_t's.
* Add accssor macro for ksi_trap.  Expands to 0 if the ksiginfo_t was
  not the result of a trap.  This matches the sigcontext trapcode semantics.
* In kpsendsig(), use KSI_TRAP_P() to select the lwp that gets the signal.
  Inspired by Matthias Drochner's fix to kpsendsig(), but correctly handles
  the case of non-trap-generated signals that have a > 0 si_code.

This patch fixes a signal delivery problem with threaded programs noted by
Matthias Drochner on tech-kern.

As discussed on tech-kern.  Reviewed and OK's by Christos.

SA_SIGINFO support for m68k (port specific changes)

add MD part of SA/pthread pagefault handling on all m68k ports

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

__KERNEL_RCSID()

Use PAGE_SIZE rather than NBPG.

success, not sucess. Noted by mjl.

Merge the nathanw_sa branch.

In the SA universe, the switch-to-this-LWP decision is made at a
different level than where preempt() calls are made, which renders
the "newlwp" argument useless.  Replace it with a "more work to do"
boolean argument.  Returning to userspace preempt() calls pass 0.
"Voluntary" preemptions in e.g. uiomove() pass 1.  This will be used
to indicate to the SA subsystem that the LWP is not yet finished in
the kernel.

Collapse the SA vs. non-SA cases of preempt() together, making the
conditional code block much smaller, and don't call sa_preempt() if
more work is to come.

NOTE: THIS IS NOT A COMPLETE FIX TO THE preempt()-in-uiomove() PROBLEM
THAT CURRENTLY EXISTS FOR SA PROCESSES.

Merge pcred and ucred, and poolify.  TBD: check backward compatibility
and factor-out some higher-level functionality.

Catch up to -current

merge the 12 copies of vm_machdep.c on the m68k platforms.
clean up some other stuff along the way, including:
 - use m68k/cacheops.*, remove duplicates from cpu.h.
 - centralize a few declarations in (all the copies of) cpu.h.
 - define M68K_VAC on platforms which have a VAC.
 - switch the sun platforms to the (now common) proc_trampoline().
 - do the phys_map thang on the sun platforms too, no reason not to.

Change "if (l->l_flag & L_SA_UPCALL)" to "while (l->l_flag & L_SA_UPCALL)"
in userret() functions or equivalent, to permit delivery of multiple upcalls
in a single kernel entry.

XXX It's getting crowded in here. Collapsing posting signals, upcalls, and
XXX kernel-exit handling into one mechanism would be nice.

No longer need to pull in lwp.h; proc.h pulls it in for us.

Curproc->curlwp renaming.

Change uses of "curproc->l_proc" back to "curproc", which is more like the
original use. Bare uses of "curproc" are now "curlwp".

"curproc" is now #defined in proc.h as ((curlwp) ? (curlwp)->l_proc) : NULL)
so that it is always safe to reference curproc (*de*referencing curproc
is another story, but that's always been true).

Catch up with -current.

Catch up to -current.

allow writing to write-only mappings.  fixes PR 3493.

cpu_upcall() -> sa_upcall_userret().

Deal with `want_resched' with trap()'s T_ASTFLT case where it belongs
instead of in userret().

MD Scheduler Activation bits for Cesfic.
Compile-tested only.

Catch up with -current.

Update the kqueue branch to HEAD.

file trap.c was added on branch nathanw_sa on 2001-11-18 18:08:10 +0000

Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.

vm_map_t -> struct vm_map *
vm_page_t -> struct vm_page *
simple_lock_data_t -> struct simplelock

add missing   #include "opt_kgdb.h"

get up-to-date (get rid of vm specific error codes, sprinkle pmap_update())

Initial import of the known working kernel bits for the NetBSD/cesfic
port. cesfic is a VME board with one or two mc68040 processors. See
the README file for details.
The port is working well with a.out userland, there are some problems
with ELF still, like applications running out of memory where it is not
expected. Some parts, in particular the pmap (which was taken from hp300
four years ago), need updating, but this is easier done within the NetBSD
CVS tree.