CVS log for src/sys/arch/sparc64/sparc64/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.

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.

update from HEAD

Sync with HEAD (as of 26th Dec)

Use PRIx64 and %# requested by phone@

fix printf formats.

Add a few assertions to verify non-privileged processor state for userland
and 32bit address mapping for 32bit processes.

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 as __diagused to variables used only in KASSERT.

Simplify with sy_invoke()

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

On second thought do not use bit 13 as a flag for syscall numbers, userland
typically sets those from a 13bit signed integer immediate field in the
instruction, so would need to jump through hoops (ok, small hoops) to
avoid sign extension.
Use a combination of the existing syscall flags instead.

Add a syscall variant passing the return address in %g5 (we need %g7 for
pthread_self and %g2 is an application register, so we can not use those
anymore).

sync with head.

sync with head

Sync with HEAD.

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

sync with head

Use lwp_getpcb() on sparc{64} and sun2/3 MD code, clean from struct user usage.

sync with head.

Sync with HEAD.

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 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.

Remove unnecessary includes.

Sync with wrstuden-revivesa-base-2.

Sync with HEAD.

Sync with head.

- remove unused old code.
- avoid use of "<< TSTATE_PSTATE_SHIFT".

Sync w/ -current. 34 merge conflicts to follow.

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.

PPWAIT is now in proc::p_lflag.

Sync with HEAD.

sync with head.

sync with head.

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.

Remove clause 3 and 4 from TNF licenses

- Retire SYCALL_MPSAFE. With the exceptions of darwin and irix emulations,
  all system calls are now MPSAFE.
- Remove unneeded acquire/release of kernel_lock.

Remove kernel unlock in startlwp which is probably a leftover of
vmlocking2 merge.

This may fix PR kern/38375.

Remove redundant #ifdef.  KASSERT implies option DIAGNOSTIC.

Sync with HEAD.

Count the number of syscalls per cpu, to avoid cache trashing around
uvmexp.syscalls.
I wonder if we should apply the same treatment to uvmexp.{traps,intr,faults}

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.

ANSIfy a couple of funcs.

sync with head

sync with HEAD

Sync with HEAD

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

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

sync with head.

Change the process/lwp flags seen by userland via sysctl back to the
P_*/L_* naming convention, and rename the in-kernel flags to avoid
conflict. (P_ -> PK_, L_ -> LW_ ). Add back the (now unused) LSDEAD
constant.

Restores source compatibility with pre-newlock2 tools like ps or top.

Reviewed by Andrew Doran.

Merge newlock2 to head.

Remove support for SA. Ok core@.

Checkpoint work in progress.

sync with head.

Sync with head.

sync with head

do not test unsigned values for < 0

Debugger() is only available if we compile with DDB

sync with head

sync with head

- 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 syscall.c was added on branch yamt-lazymbuf on 2006-06-21 14:56:48 +0000

file syscall.c was added on branch elad-kernelauth on 2006-03-07 07:21:52 +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.

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

file syscall.c was added on branch yamt-pdpolicy on 2006-03-13 09:07:03 +0000

implement PT_SYSCALL

Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

merge ktrace-lwp.

ktrsysret takes an lwp pointer. Noted by Christos.

Sync with HEAD. Here we go again...

file syscall.c was added on branch ktrace-lwp on 2005-11-10 13:59:34 +0000

propagate martin's fix in the syscall_plain version. It does not make any
sense to print the syscall return part of syscall debug when we did not
print the syscall enter portion.

Ooops, gcc was right - *ap could have been used uninitialized (when
getargs() failed) - pointed out by Juergen Hannken-Illjes.

Shutup gcc - it eroneously thinks *ap might be used uninitialized.

make this compile again.

Handle the case where systrace is used in 32 bit emulation on a 64 bit system.
In this case, systrace may modify the arguments to the syscall, so we need
to copy them back. Restructuring the code a bit avoids an unnecessary argument
copy loop in the regular case.

pass the code out of getargs, so that ktracing __syscall using syscalls
works.

matt asked for his 32<->64 debugging back.

move some more code out to getargs to match the upcoming sparc.

Re-factor syscall, and make it use syscall_{plain,fancy}.