Define __HAVE_STRUCT_SIGCONTEXT regardless of its current visibility.

Make sigcontext13 visible only to _KERNEL.

Merge all MD __sigaction14_sigtramp.c copies into one:
- sparc and sparc64 were not using version 0 sigcontext when there were
no arguments in the signal version. This was probably a bug.
- vax is using +1 the version numbers of the other archs.
- Only hppa was defining __LIBC12_SOURCE__ so it was getting a working
sigcontext before. all the other ports that supported sigcontext had
the compat code disabled.
[pointed out by thorpej, thanks!]
If we want to remove sigcontext support from userland at least now there
is less work to do so.

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

Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.23.62; 1.23.66; 1.23.72; 1.23.74; 1.23.76;
We don't need (or want!) to include cpuframe.h or have sigstate
visible to userland on m68k. Fixes numerous pkgsrc build issues where
"struct frame" as defined in cpuframe.h pollutes the local namespace.

Compile-tested full builds for hp300, mac68k, amiga, sun3, and next68k.

OK'ed by matt@.

branches: 1.22.4; 1.22.6; 1.22.8; 1.22.10; 1.22.12;
merge ktrace-lwp.

namespace sanity: don't expose compatibility sigcontext stuff
unnecessarily

branches: 1.20.10; 1.20.12; 1.20.14;
Revert last change. It breaks the build due to interactions with
frame.h.

For a while, we exported symbols in the user namespace (which should only
be interesting for the kernel), thus breaking (e.g.) vim. (PR 26048)

SIGTRAMP_VALID() should not pollute the user namespace

nothing cares about __HAVE_SIGINFO anymore, so nuke it

bye, bye _MCONTEXT_TO_SIGCONTEXT and vice versa.

Define SIGTRAMP_VALID(v).

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.

branches: 1.12.2;
Add a new feature-test macro, _NETBSD_SOURCE. If this is defined
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.
<sys/featuretest.h> defined _NETBSD_SOURCE if none of _ANSI_SOURCE,
_POSIX_C_SOURCE and _XOPEN_SOURCE is defined, so as to preserve
existing behaviour.

This has two major advantages:
+ Programs that require non-POSIX facilities but define _POSIX_C_SOURCE
can trivially be overruled by putting -D_NETBSD_SOURCE in their CFLAGS.
+ It makes most of the #ifs simpler, in that they're all now ORs of the
various macros, rather than having checks for (!defined(_ANSI_SOURCE) ||
!defined(_POSIX_C_SOURCE) || !defined(_XOPEN_SOURCE)) all over the place.

I've tried not to change the semantics of the headers in any case where
_NETBSD_SOURCE wasn't defined, but there were some places where the
current semantics were clearly mad, and retaining them was harder than
correcting them. In particular, I've mostly normalised things so that
_ANSI_SOURCE gets you the smallest set of stuff, then _POSIX_C_SOURCE,
_XOPEN_SOURCE and _NETBSD_SOURCE in that order.

Tested by building for vax, encouraged by thorpej, and uncontested in
tech-userlevel for a week.

Merge the nathanw_sa branch.

During signal delivery, arrange to have the signal handler invoked
directly, using the trampoline only for the return path. Saves a
"jsr" in the trampoline.

Reviewed, tested and OK'd by Steve Woodford.

Swap the order of the sigcontext and hardware state in the sigframe.

branches: 1.8.26; 1.8.30; 1.8.38;
Pull in <m68k/frame.h> if __M68K_SIGNAL_PRIVATE, for sigstate.

Put the sigstate and sigframe definitions in signal.h, protected by
__M68K_SIGNAL_PRIVATE.

Define the new sigcontext structure.

If any of _ANSI_SOURCE, _POSIX_C_SOURCE or _XOPEN_SOURCE are defined, don't
provide any identifiers other than sig_atomic_t.

Only define sig_atomic_t when _ANSI_SOURCE is defined.

new RCS ID format.

protect against multiple inclusion

md signal context.

Make sigcontext13 visible only to _KERNEL.

Merge all MD __sigaction14_sigtramp.c copies into one:
- sparc and sparc64 were not using version 0 sigcontext when there were
no arguments in the signal version. This was probably a bug.
- vax is using +1 the version numbers of the other archs.
- Only hppa was defining __LIBC12_SOURCE__ so it was getting a working
sigcontext before. all the other ports that supported sigcontext had
the compat code disabled.
[pointed out by thorpej, thanks!]
If we want to remove sigcontext support from userland at least now there
is less work to do so.

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

Make the emulations, exec formats, coredump, NFS, and the NFS server
into modules. By and large this commit:

- shuffles header files and ifdefs
- splits code out where necessary to be modular
- adds module glue for each of the components
- adds/replaces hooks for things that can be installed at runtime

branches: 1.23.62; 1.23.66; 1.23.72; 1.23.74; 1.23.76;
We don't need (or want!) to include cpuframe.h or have sigstate
visible to userland on m68k. Fixes numerous pkgsrc build issues where
"struct frame" as defined in cpuframe.h pollutes the local namespace.

Compile-tested full builds for hp300, mac68k, amiga, sun3, and next68k.

OK'ed by matt@.

branches: 1.22.4; 1.22.6; 1.22.8; 1.22.10; 1.22.12;
merge ktrace-lwp.

namespace sanity: don't expose compatibility sigcontext stuff
unnecessarily

branches: 1.20.10; 1.20.12; 1.20.14;
Revert last change. It breaks the build due to interactions with
frame.h.

For a while, we exported symbols in the user namespace (which should only
be interesting for the kernel), thus breaking (e.g.) vim. (PR 26048)

SIGTRAMP_VALID() should not pollute the user namespace

nothing cares about __HAVE_SIGINFO anymore, so nuke it

bye, bye _MCONTEXT_TO_SIGCONTEXT and vice versa.

Define SIGTRAMP_VALID(v).

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.

branches: 1.12.2;
Add a new feature-test macro, _NETBSD_SOURCE. If this is defined
by the application, all NetBSD interfaces are made visible, even
if some other feature-test macro (like _POSIX_C_SOURCE) is defined.
<sys/featuretest.h> defined _NETBSD_SOURCE if none of _ANSI_SOURCE,
_POSIX_C_SOURCE and _XOPEN_SOURCE is defined, so as to preserve
existing behaviour.

This has two major advantages:
+ Programs that require non-POSIX facilities but define _POSIX_C_SOURCE
can trivially be overruled by putting -D_NETBSD_SOURCE in their CFLAGS.
+ It makes most of the #ifs simpler, in that they're all now ORs of the
various macros, rather than having checks for (!defined(_ANSI_SOURCE) ||
!defined(_POSIX_C_SOURCE) || !defined(_XOPEN_SOURCE)) all over the place.

I've tried not to change the semantics of the headers in any case where
_NETBSD_SOURCE wasn't defined, but there were some places where the
current semantics were clearly mad, and retaining them was harder than
correcting them. In particular, I've mostly normalised things so that
_ANSI_SOURCE gets you the smallest set of stuff, then _POSIX_C_SOURCE,
_XOPEN_SOURCE and _NETBSD_SOURCE in that order.

Tested by building for vax, encouraged by thorpej, and uncontested in
tech-userlevel for a week.

Merge the nathanw_sa branch.

During signal delivery, arrange to have the signal handler invoked
directly, using the trampoline only for the return path. Saves a
"jsr" in the trampoline.

Reviewed, tested and OK'd by Steve Woodford.

Swap the order of the sigcontext and hardware state in the sigframe.

branches: 1.8.26; 1.8.30; 1.8.38;
Pull in <m68k/frame.h> if __M68K_SIGNAL_PRIVATE, for sigstate.

Put the sigstate and sigframe definitions in signal.h, protected by
__M68K_SIGNAL_PRIVATE.

Define the new sigcontext structure.

If any of _ANSI_SOURCE, _POSIX_C_SOURCE or _XOPEN_SOURCE are defined, don't
provide any identifiers other than sig_atomic_t.

Only define sig_atomic_t when _ANSI_SOURCE is defined.

new RCS ID format.

protect against multiple inclusion

md signal context.