sys/ktrace.h: fix off-by-one in snprintb for ktrace flags

There's a one-bit gap between TRC_EMUL and INHERIT.

Noticed by RVP.

sys/ktrace.h: fix off-by-one error in snprintb for ktrace flags

ktrace(9): Fix mutex detection in ktrcsw.

On _entry_ to sleepq_block, l->l_syncobj is set so that ktrcsw
(ktr_csw) has the opportunity to detect whether it's a mutex or
rwlock. It is critical to avoid ktealloc when we're sleeping on a
mutex because we may be in softint context where ktealloc is
forbidden.

But after mi_switch, on _exit_ from sleepq_block, l->l_syncobj may
have been changed back to &sched_syncobj or something by
sleepq_remove, and so ktrcsw can no longer rely on l->l_syncobj to
determine whether we _were_ sleeping on a mutex or not.

Instead, save the syncobj in sleepq_block and pass it through as an
argument to ktrcsw.

Reported-by: syzbot+414edba9d161b7502658@syzkaller.appspotmail.com
Reported-by: syzbot+4425c97ac717b12495a2@syzkaller.appspotmail.com
Reported-by: syzbot+5812565b926ee8eb5cf3@syzkaller.appspotmail.com
Reported-by: syzbot+8b9d7b066c32dbcdc63b@syzkaller.appspotmail.com
Reported-by: syzbot+909a8e743c967d97f433@syzkaller.appspotmail.com
Reported-by: syzbot+e2a34bb5509bea0bba11@syzkaller.appspotmail.com
Reported-by: syzbot+faaea3aad6c9d0829f76@syzkaller.appspotmail.com

add format for flags.

s/static inline/static __inline/g for consistency with other include
headers.

branches: 1.65.14;
Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision

sys/ktrace.h: fix off-by-one error in snprintb for ktrace flags

ktrace(9): Fix mutex detection in ktrcsw.

On _entry_ to sleepq_block, l->l_syncobj is set so that ktrcsw
(ktr_csw) has the opportunity to detect whether it's a mutex or
rwlock. It is critical to avoid ktealloc when we're sleeping on a
mutex because we may be in softint context where ktealloc is
forbidden.

But after mi_switch, on _exit_ from sleepq_block, l->l_syncobj may
have been changed back to &sched_syncobj or something by
sleepq_remove, and so ktrcsw can no longer rely on l->l_syncobj to
determine whether we _were_ sleeping on a mutex or not.

Instead, save the syncobj in sleepq_block and pass it through as an
argument to ktrcsw.

Reported-by: syzbot+414edba9d161b7502658@syzkaller.appspotmail.com
Reported-by: syzbot+4425c97ac717b12495a2@syzkaller.appspotmail.com
Reported-by: syzbot+5812565b926ee8eb5cf3@syzkaller.appspotmail.com
Reported-by: syzbot+8b9d7b066c32dbcdc63b@syzkaller.appspotmail.com
Reported-by: syzbot+909a8e743c967d97f433@syzkaller.appspotmail.com
Reported-by: syzbot+e2a34bb5509bea0bba11@syzkaller.appspotmail.com
Reported-by: syzbot+faaea3aad6c9d0829f76@syzkaller.appspotmail.com

add format for flags.

s/static inline/static __inline/g for consistency with other include
headers.

branches: 1.65.14;
Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision

ktrace(9): Fix mutex detection in ktrcsw.

On _entry_ to sleepq_block, l->l_syncobj is set so that ktrcsw
(ktr_csw) has the opportunity to detect whether it's a mutex or
rwlock. It is critical to avoid ktealloc when we're sleeping on a
mutex because we may be in softint context where ktealloc is
forbidden.

But after mi_switch, on _exit_ from sleepq_block, l->l_syncobj may
have been changed back to &sched_syncobj or something by
sleepq_remove, and so ktrcsw can no longer rely on l->l_syncobj to
determine whether we _were_ sleeping on a mutex or not.

Instead, save the syncobj in sleepq_block and pass it through as an
argument to ktrcsw.

Reported-by: syzbot+414edba9d161b7502658@syzkaller.appspotmail.com
Reported-by: syzbot+4425c97ac717b12495a2@syzkaller.appspotmail.com
Reported-by: syzbot+5812565b926ee8eb5cf3@syzkaller.appspotmail.com
Reported-by: syzbot+8b9d7b066c32dbcdc63b@syzkaller.appspotmail.com
Reported-by: syzbot+909a8e743c967d97f433@syzkaller.appspotmail.com
Reported-by: syzbot+e2a34bb5509bea0bba11@syzkaller.appspotmail.com
Reported-by: syzbot+faaea3aad6c9d0829f76@syzkaller.appspotmail.com

add format for flags.

s/static inline/static __inline/g for consistency with other include
headers.

branches: 1.65.14;
Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision

add format for flags.

s/static inline/static __inline/g for consistency with other include
headers.

branches: 1.65.14;
Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision

s/static inline/static __inline/g for consistency with other include
headers.

branches: 1.65.14;
Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision

Allow emulations to override the creation of ktrace records for posting
signals. In compat_netbsd32 use this to write the 32bit version of
the records, so a 32bit userland kdump is happy.

Make the ktrace record written by do_sys_sendmsg/do_sys_recvmsg overridable
by the caller. Use this in compat_netbsd32 to log the 32bit version, so
the 32bit userland kdump is happy.

PR 50633 and PR 50634 from Brad Harder: add missing includes:
sys/signal.h and sys/time.h. Also add sys/uio.h which is needed and
for some probably historical/obsolete reason has been documented as a
prerequisite instead of included directly.

This also requires sys/param.h for MAXCOMLEN (blah) but for now at
least shift that to the documentation instead of including it
directly as it's a sewer.

Rename the two register_t uses that leaked to userland __register_t so that
they can be fixed later if we want.

branches: 1.61.6;
include necessary headers

Put vfs bits of ktrace into kern_ktrace_vfs.c per convention.

branches: 1.59.2; 1.59.4;
Remove COMPAT_SA / KERN_SA. Welcome to 6.99.3!
Approved by core@.

branches: 1.58.2; 1.58.6;
kern/42030 - tracking of file descriptors by ktrace/kdump

branches: 1.57.2;
Remove Mach specific trace points.

branches: 1.56.6; 1.56.8;
merge christos-time_t

branches: 1.55.2; 1.55.10;
ktrgeniov: pass down to correct function.

Merge wrstuden-revivesa into HEAD.

branches: 1.53.6; 1.53.8; 1.53.12; 1.53.14; 1.53.18;
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

KTRFAC_ROOT -> KTRFAC_PERSISTENT, and update comments.

Discussed with christos@ and yamt@.

Add a few buckets of 'const' and 'static' to the system call trace code.
sys_trace() still needs to be able to update the syscall args.

branches: 1.50.2; 1.50.8; 1.50.10; 1.50.14;
Fix inverted test in ktrpoint(), NAMI traces weren't being generated.
Also inline the 'ktrace_on' part of the test.

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

branches: 1.48.2; 1.48.6;
Add a ktrkuser() function that can be used to generate a KTR_USER trace
entry from kernel-resident data.
Mainly so I can (ab)use the KTR_USER entry for extra info.

Move the ktrace (and systrace) in namei() inside the retry loop for
emulation lookups.
If doing a lookup relative to the emulation root, prepend the emulation root
to the traced filename.
While here pass the filename length through to the ktrace code since namei()
knows the length and ktr_namei() would have to call strlen().
Note: that if namei() is being called during execve processing, the emulation
root name isn't available and "/emul/???" is used. Also namei() has to use
strlen() to get the lenght on the emulatoon root - even though it is a
compile-time constant string.

branches: 1.46.2; 1.46.6; 1.46.8;
Merge newlock2 to head.

branches: 1.45.2; 1.45.4;
make ktruser enforce the maximum buffer length, and return an error.

Add a -t+S flag to ktrace for tracing activity related to sysctl. MIB
names will be displayed, with data readen and written as well.

branches: 1.43.20; 1.43.22;
meet Mr. Webster.

merge ktrace-lwp.

branches: 1.41.2; 1.41.4; 1.41.12;
nuke trailing whitespace

branches: 1.40.4; 1.40.6;
Create kernel thread and let it to issue the write request. We can't
do this from trace target process since we can't sleep at certain
trace point (otherwise system may hang). Address PR#23155.

Fix a panic induced by forcing ktrace to inject an emul record on
a ktraced file descriptor that has already been invalidated. Change
all ktrace functions to propagate the error from ktrwrite() and
check for it. Thanks to Pavel Cahyna for finding this and giving
a perfect bug report.

[should be pulled up for 2.0]

branches: 1.38.2;
Make ktrwrite() and ktrinitheader() private again. ktrsyscall32() no longer
exists.

export ktrinitheader() and ktrwrite() for ktrsyscall32(), which is used
to write 32 bit syscall arguments in a 64 bit format.

Defer writing of KTR_EMUL entry until first trace done by target process.
Stops ktrops sleeping with the pid table locked.

Enable tracing of out of line data sent with Mach message

constify sendsig/trapsignal [suggested by gimpy]

support for siginfo_t in ktrace

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

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

Add ktrace of env and args during exec.

branches: 1.30.2;
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

ktrace rval[1] - in order to get both fd numbers for pipe()

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.

always prototype mach message support.

Added support for dumping mach messages in ktrace/kdump. While we are
there, KNFify a few functions.

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

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

Systrace support.

branches: 1.22.2; 1.22.4; 1.22.16;
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

add utrace(2) - this syscall allows to add user ktrace entries
idea from FreeBSD, but added argument (const char *id) so that it's possible
to differentiate between entries from different sources

add FreeBSD-compatible KTR_USER/KTRFAC_USER

Reduce use of curproc in several places:

- Change ktrace interface to pass in the current process, rather than
p->p_tracep, since the various ktr* function need curproc anyway.

- Add curproc as a parameter to mi_switch() since all callers had it
handy anyway.

- Add a second proc argument for inferior() since callers all had
curproc handy.

Also, miscellaneous cleanups in ktrace:

- ktrace now always uses file-based, rather than vnode-based I/O
(simplifies, increases type safety); eliminate KTRFLAG_FD & KTRFAC_FD.
Do non-blocking I/O, and yield a finite number of times when receiving
EWOULDBLOCK before giving up.

- move code duplicated between sys_fktrace and sys_ktrace into ktrace_common.

- simplify interface to ktrwrite()

branches: 1.18.2;
Don't truncate syscall return values on LP64 platforms.

* Add a comment to ktrgetheader() mentioning that ktr_len and ktr_buf are
being left uninitialized intentionally; addresses PR kern/6987.
* In ktrsysret(), initialize the unused ktr_eosys to avoid writing random junk.

branches: 1.16.8;
Substantial signal handling changes:
* Increase the size of sigset_t to accomodate 128 signals -- adding new
versions of sys_setprocmask(), sys_sigaction(), sys_sigpending() and
sys_sigsuspend() to handle the changed arguments.
* Abstract the guts of sys_sigaltstack(), sys_setprocmask(), sys_sigaction(),
sys_sigpending() and sys_sigsuspend() into separate functions, and call them
from all the emulations rather than hard-coding everything. (Avoids uses
the stackgap crap for these system calls.)
* Add a new flag (p_checksig) to indicate that a process may have signals
pending and userret() needs to do the full (slow) check.
* Eliminate SAS_ALTSTACK; it's exactly the inverse of SS_DISABLE.
* Correct emulation bugs with restoring SS_ONSTACK.
* Make the signal mask in the sigcontext always use the emulated mask format.
* Store signals internally in sigaction structures, rather than maintaining a
bunch of little sigsets for each SA_* bit.
* Keep track of where we put the signal trampoline, rather than figuring it out
in *_sendsig().
* Issue a warning when a non-emulated sigaction bit is observed.
* Add missing emulated signals, and a native SIGPWR (currently not used).
* Implement the `not reset when caught' semantics for relevant signals.

Note: Only code touched by the i386 port has been modified. Other ports and
emulations need to be updated.

fktrace changes.

Merge with Lite2 + local changes

add/cleanup multiple inclusion protection.

Fix some missing/wrong prototypes so that kern/* compiles again

Added a KTR_EMUL record to be used to indicate syscall emulation changes.

KERNEL -> _KERNEL

KERNEL -> _KERNEL

syscall tracing: store code and argsize, as ints; update comments.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

new standard, minimally intrusive ID format

add rcsid

add support for context switch tracing

add rcs ids as necessary, and also clean up headers

Add consistent multiple-inclusion protection.

branches: 1.1.1;
Initial revision