CVS log for src/sys/arch/arm/arm/syscall.c

Up to [cvs.NetBSD.org] / src / sys / arch / arm / arm

Request diff between arbitrary revisions

Keyword substitution: kv
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.

G/C some old code that was for acorn26

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.

Sync with HEAD

Pull up following revision(s) (requested by martin in ticket #859):
	sys/arch/arm/arm/syscall.c: revision 1.65
PR kern/53261: handle SYS_syscall indirection in MD code - the generic
version would misalign the argument array.

PR kern/53261: handle SYS_syscall indirection in MD code - the generic
version would misalign the argument array.

Remove port-acorn26

OK core@

Fix test for SMI_IMB{,range} that was broken in 1.46

From Ramakrishna Rao Desetti

update from HEAD

Sync with HEAD

Consistency around the user trapframe for all LWPs and there's no need to
keep assigning it in kernel entry points.

Trailing whitespace

Rebase to HEAD as of a few days ago.

Add __NO_FIQ to prevent testing of the PSR FIQ bit
Use VALID_R15_PSR(pc, spsr) instead of testing explicitly

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

Merge armv7 support from HEAD, specifically support for the BCM5301X
and BCM56340 evbarm kernels.

Add read_insn and read_thumb_insn inlines to hide the endianness of
instructions and use them as appropriate.

sync with head

Move parts of cpu.h that are not needed by MI code in <arm/locore.h>
Don't include <machine/cpu.h> or <machine/frame.h>, use <arm/locore.h>
Use <arm/asm.h> instead of <machine/arm.h>

Use sy_invoke

Merge improved arm support (especially Cortex) from HEAD
including OMAP and BCM53xx support.

sync with head

small rototill.
pcb_flags is dead.  PCB_NOALIGNFLT is now in stored l_md.md_flags as
MDLWP_NOALIGNFLT.  This avoids a few loads of the PCB in exception handling.
pcb_tf has been moved to l_md.md_tf.  Again this avoids a lot of pcb
references just to access or set this.  It also means that pcb doesn't
need to accessed by MI code.
Move pcb_onfault to after the pcb union.
Add pcb_sp macro to make code prettier.
Add lwp_settrapframe(l, tf) to set the l_md.md_tf field.
Use lwp_trapframe to access it (was process_frame but that name was changed
in a previous commit).
Kill off curpcb in acorn26.
Kill the checks for curlwp being NULL.
Move TRAP_USERMODE from arm32/fault.c to frame.h and a __PROG26 version.
Replace tests for usermode with that macro.

Use tf instead of frame as trapframe pointer.

Make sure copyargs is 64-bit aligned (for EABI)

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

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

Use lwp_getpcb() on ARM (and acorn26/32), clean from struct user usage.

Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code.  Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

sync with head.

Sync with HEAD.

Sync with HEAD.

ILL_ILLTRP seems like the right code for a SWI that's not in the range
assigned for syscalls, so use it.

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

fix typo (thx nick)

Rework syscall.c similar to i386.  Saves 3KB

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.

make this compile

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.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Merge kernel changes in matt-armv6 to HEAD.

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

sync with HEAD

Sync with HEAD.

Sync with HEAD.

sync with head.

Sync to 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 to 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.

Add thumb support for syscalls > 255.  If embedded syscall # is 0, take
syscall number from ip register.

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.

Changes for newlock2.

sync with head.

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 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.

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 09:06:52 +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.

Sync with HEAD.

Fix the argument to KERNEL_PROC_LOCK/KERNEL_PROC_UNLOCK.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD.

Handle SWI's from Thumb code.

Note: this may need further work.  For the momement we unconditionally
convert a Thumb SWI insn into an ARM SWI with the operation code
zero-extended to 24 bits.  However, this should really be a property
of the emulation (how do we know that all emulated systems would want
to work this way?), but that would mean pushing all the handling down
into each of the emulators.

Sync with HEAD

Pullup revs 1.21-1.22 (requested by skrll in ticket #1552)
Fix up some unitialised variables to avoid a possible crash.

Check alignment of the fault PC before de-referencing it.
Give the process a Illegal Instruction fault if the PC is misaligned.

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

The uninitialized variable in this case was a bug, which could probably be
used to crash the system.

Fix up some unitialised variables.

* 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.

Add SA_SIGINFO support for ARM (from Chris Gilbert).

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

Do the syscall_plain/syscall_fancy dance on ARM.  Shaves a fair number
of cycles off the syscall overhead.

Since all COMPAT_LINUX platforms now support __HAVE_SYSCALL_INTERN,
garbage-collect the LINUX_SYSCALL_FUNCTION stuff.

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.

Fix compilation errors introduced by recent trace_enter()/ktrsyscall() changes.

Provided by FUKAUMI Naoki <naoki at fukaumi dot org> in kern/19070.

Catch up to -current.

Correct some gratuitously-wrong indentation.

Minimal changes to allow a kernel with "options MULTIPROCESSOR" to compile
and boot multi-user on a single-processor machine.  Many of these changes
are wildly inappropriate for actual multi-processor operation, and correcting
this will be my next task.

sync kqueue branch with HEAD

catch up with -current.

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 on kqueue branch

Catch up to -current.

MD systrace gluons.

Make these compile again.

Catch up to -current.
(CVS: It's not just a program. It's an adventure!)

arm26->acorn26 transition.

Catch up with -current.

__RCSID -> __KERNEL_RCSID

Move arm700bugcount into stuct cpu_info, and attach it in
identify_master_cpu().

Catch up to -current.

Sync w/ -current.

file syscall.c was added on branch nathanw_sa on 2002-02-28 04:07:19 +0000

file syscall.c was added on branch kqueue on 2002-02-11 20:07:17 +0000

XXX Local prototype for syscall().

Separate out syscall() out into three parts:
  swi_handler() does stuff that all SWIs will need, then calls
   curproc->p_emul->e_syscall.
  syscall() handles native NetBSD system calls.
  linux_syscall() handles Linux system calls.

Crude first cut at ARMLinux binary compatibility.  Successfully runs
"/emul/linux/bin/echo hello, world", dynamically linked.

Use symbolic names for SWI number blocks (from <arm/swi.h>).

Make this actually compile on acorn32.

Combined syscall handler for all ARM ports.  This is basically the arm32
version, made readable and compatible with arm26.  In addition, this adds
support for NetBSD/arm's newly allocated SWI range.