CVS log for src/sys/arch/m68k/m68k/m68k_syscall.c

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Default branch: MAIN

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).

Sync with HEAD

Centralized shared part of child_return() into MI part

Add a new function md_child_return() for MD specific bits only.

New child_return() is now part of MI and central code that handles
uniformly tracing code (KTR and ptrace(2)).

Synchronize value passed to ktrsysret() among ports to SYS_fork. This is
a traditional value and accessing p_lflag to check for PL_PPWAIT shall
use locking against proc_lock. Returning SYS_fork vs SYS_vfork still isn't
correct enough as there are more entry points to forking code. Instead of
making it too good, just settle with plain SYS_fork for all ports.

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.

Rework the fork(2)/vfork(2) event signalling under ptrace(2)

Remove the constraint of SIGTRAP event being maskable by a tracee.

Now all SIGTRAP TRAP_CHLD events are delivered to debugger.

This code touches MD specific logic and the child_return routine.
It's an intermediate step with a room for refactoring in future and
right now the least invasive approach. This allows to assert expected
behavior in already existing ATF tests and make the code prettier
in future keeping the same semantics. Probably there is a need for a MI
wrapper of child_return for shared functionality between ports.

Sync with HEAD, resolve a few conflicts

Remove compat_svr4 and compat_svr4_32, as discussed on tech-kern@ recently,
but also as discussed several times in the past.

update from HEAD

Sync with HEAD

adjust to new trace_{enter,exit} signatures.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Mark a diagnostic-only variable

sync with head

sync to -current.

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

merge to -current.

Add a posix_spawn syscall, as discussed on tech-kern.
Based on the summer of code project by Charles Zhang, heavily reworked
later by me - all bugs are likely mine.
Ok: core, releng.

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@.

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 (-D20101022).

Get rid of more #ifdef COMPAT_AOUT_M68K dependent part.
Now compat_aoutm68k can be a module.

XXX: linux/svr4 ELF binaries also require a syscall return value in %a0?

Fix typo.

Un-ifdef COMPAT_AOUT_M68K for MODULAR kernel.

sync with head.

sync with head

Sync with HEAD.

lwp_uc_pool has been replaced with kmem(9)
so also replace <sys/pool.h> with <sys/kmem.h>.

Remove lwp_uc_pool, replace it with kmem(9), plus add some consistency.
As discussed, a while ago, with ad@.

sync with head

s/cpu_fork/cpu_lwp_fork/ in comment.

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

sync with head.

Sync with HEAD.

Sync with HEAD.

Now that COMPAT_50 is needed inside the kernel for the time_t changes,
piggyback it and guard the copying of syscall return values on it. Our
libc has been fixed quite some time ago, time to get rid of the bogus copy.

Update haad-dm branch to haad-dm-base2.

Provide a small inline wrapper for sysent::sy_call() and use it to store
the active syscall description in struct lwp. To be used at some future
point to prevent unloading of modules that provide syscalls, while the
syscalls are in use.

Sync with HEAD.

Merge wrstuden-revivesa into HEAD.

Add sys/sa.h and sys/savar.h which I think are needed with
today's syscall change.

Add a new vp-private flag, SAVP_FLAG_DELIVERING. This flag indicates
that the vp is in the process of delivering a new-thread upcall.
This is a BLOCKED or NEWPROC upcall. Do NOT generate any BLOCKED
upcalls while this is set. Set it at the end of sa_switchcall()
and clear it at syscall entry. Sadly, I have found no other
way to handle this. The old SA interface has no way for
userland to acknowledge that it got the upcall, so use syscall
entry as the indicator that libpthread got it.

This addresses the issue seen on current-users with firefox
dying with a blockedgen != unbockedgen error. The problem is we
deliver a BLOCKED upcall, but between the end of userret()
and when the CPU indicates that it's running in user mode, we take
a page fault. Said page fault blocks, blocking upcall delivery.
The original block, however, was short-lived, and the UNBLOCK
happens shortly. It happens before libpthread actually notices
the BLOCKED upcall. Boom!

Unfortunately a LOCKDEBUG/DIAGNOSTIC kernel still dies before
firefox opens. However this new issue is with uvm code calling
mtsleep when not holding a correct lock; sa_switch() is exploding
at KASSERT(lwp_locked(l, NULL)); before it's done _anything_.

Also, while here, add sa_system_disabled. This is an integer
that we examine when starting SA for a proc. If it's non-zero,
we error out. Once this is hooked into sysctl, you'll be able to
disable SA w/o recompiling.

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.

sync with head.

Remove the 'args' parameter to 'trace_exit()' it is no longer used.
Instead of passing the (un)real system call code and syscall table pointer,
just pass the number of arguments - which is what ktrace really wants.
Ride forthcoming 4.99.53

sync with head

sync with HEAD

Sync with HEAD

Don't pass 'curlwp' into trace_enter() and trace_exit().

Sync with HEAD

Remove COMPAT_HPUX.

Make the copy of the syscall return value to register A0 independend of
options COMPAT_AOUT_M68K. Works around PR port-m68k/37631.
XXX we will phase out the copy to A0 completely and handle it in userland
XXX in the future.

sync with HEAD

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 HEAD.

Sync with HEAD.

Sync with HEAD.

Changes to make ktrace LKM friendly and reduce ifdef KTRACE. Proposed
on tech-kern.

Sync with HEAD.

Replace (void *) with (char *) where pointer arith is required.

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

sync with head.

Merge newlock2 to head.

Remove support for SA. Ok core@.

sync with head.

sync with head

sync with head

TAB/space cleanup.

- 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.

sync with head.

Syscall debug tracing is handled by trace_enter() / trace_exit().  Change
trace_is_enabled() to return TRUE if SYSCALL_DEBUG is defined, and g/c
all of the SYSCALL_DEBUG handling from individual system call dispatch
routines.

file m68k_syscall.c was added on branch elad-kernelauth on 2006-03-07 07:21:51 +0000

Syscall debug tracing is handled by trace_enter() / trace_exit().  Change
trace_is_enabled() to return TRUE if SYSCALL_DEBUG is defined, and g/c
all of the SYSCALL_DEBUG handling from individual system call dispatch
routines.

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.

syscall_fancy is only defined if either KTRACE or SYSTRACE is set,
so enclose its use in the same set of conditionals.

Always define syscall_fancy.

Add a proc_is_traced_p() macro and use it, instead of copying the same code
in many places. Idea from thorpej.

file m68k_syscall.c was added on branch yamt-pdpolicy on 2006-03-13 09:06:57 +0000

implement PT_SYSCALL

merge ktrace-lwp.

Sync with HEAD. Here we go again...

No point in declaring syscall_intern and syscall in a zillion places.

PR/29607: Christian Biere systrace doesn't handle interrupted syscalls properly
Instead of jumping to the default "bad" case, jump to the error handling
switch, so that we can deal with ERESTART/EJUSTRETURN properly.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Use ANSI function decls and static.

Sync with HEAD

Don't pass the (unused) return value args to the
trace_enter()/systrace_enter() functions.

SA_SIGINFO support for m68k

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

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

__KERNEL_RCSID()

Apply the aborted ktrace-lwp changes to a specific branch.  This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it.  This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.

Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records.  The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Merge the nathanw_sa branch.

Sync with HEAD.

Pass the system call table to trace_enter() and ktrsys() so that it is
possible to use alternate system call tables. This is usefull for
displaying correctly the arguments in Mach binaries traces.

If NULL is given, then the regular systam call table for the process is used.

Sync with HEAD.

Add a realcode argument to trace_enter and ktrsyscall. realcode is the
original system call number, which can be negative for a Mach trap.
We cannot just replace code by realcode, because ktrsyscall uses it as
an index in the system call table, thus crashing the kernel when the
value is negative.

sync kqueue branch with HEAD

LWPify.

Catch up to -current.

catch up with -current.

Only declare and define syscall_fancy if KTRACE and/or SYSTRACE are defined.

catch up with -current.

catch up with -current.

m68k syscall rototill:

 - Switch all m68k-based ports over to __HAVE_SYSCALL_INTERN.
 - Add systrace glue.
 - Define struct mdproc in <m68k/proc.h> instead of <machine/proc.h>.
   (They were all defined exactly the same anyway, other than a couple
   of the MDP_* flags.)

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 to -current.

MD systrace gluons.

Make it compile with KTRACE.

Re-sync with current MI SA code.

Kernel support for Scheduler Activations on m68k-based ports using
mvme68k as a testbed.

Boots multi-user on an mvme162, although userland support for SA is not
yet integrated/tested.

Sync with HEAD

file m68k_syscall.c was added on branch thorpej_scsipi on 2001-01-05 17:34:36 +0000

Unification of the m68k syscall() function.