sys/compat: Memset zero before copyout.

Just in case of uninitialized padding which would lead to kernel
stack disclosure. If the compiler can prove the memset redundant
then it can optimize it away; otherwise better safe than sorry.

G/C some old code that was for acorn26

branches: 1.32.32;
Do not uselessly include <sys/malloc.h>.

branches: 1.31.4;
Use <arm/locore.h>

branches: 1.30.2; 1.30.4;
Rename process_frame to lwp_trapframe

branches: 1.29.8; 1.29.16;
many changes for COMPAT_LINUX:
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.

branches: 1.28.2; 1.28.4;
Use lwp_getpcb() in compat code, clean from struct user.

branches: 1.27.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.26.2;
Merge proc::p_mutex and proc::p_smutex into a single adaptive mutex, since
we no longer need to guard against access from hardware interrupt handlers.

Additionally, if cloning a process with CLONE_SIGHAND, arrange to have the
child process share the parent's lock so that signal state may be kept in
sync. Partially addresses PR kern/37437.

branches: 1.25.6; 1.25.8;
Make this compile again.

Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.23.4;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

branches: 1.22.8; 1.22.10; 1.22.18;
Remove duplicate #include <sys/param.h>,
and pull in the <sys/cdefs.h> needed for __KERNEL_RCSID

From: Slava Semushin <php-coder@altlinux.ru>

branches: 1.21.2; 1.21.4; 1.21.6;
fix caddr_t fallout.

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

branches: 1.19.2;
Merge newlock2 to head.

branches: 1.18.2;
Use VALID_R15_PSR() to check the context we're restoring in
linux_sys_sigreturn(). Somehow this got missed when I introduced that macro.

branches: 1.17.4; 1.17.8;
merge ktrace-lwp.

need linux_syscallargs.h to compile, and remove inline function.

branches: 1.15.2;
Define linux_usertrap function, and set it in struct emul. For all
but amd64, it just returns 0, doing nothing.

For amd64, it implements vsyscalls through cheating: if the faulting
address is in the vsyscall area (which is statically known on Linux/amd64),
and the intruction pointer is too, it must have been a vsyscall. In that
case, retrieve the return address from the user stack, fix up %rip and
%rsp, and just execute the normal system call. It will return as if
the vsyscall has been executed.

nuke trailing whitespace

branches: 1.13.8; 1.13.10;
Adapt ARM Linux compat code to deal with SIGINFO.

Fix "constify sendsig/trapsignal" fallout for non-siginfo'd archs. Test
compiled on most architectures.

branches: 1.11.2;
Merge the nathanw_sa branch.

Don't include <sys/map.h>.

Add kernel support for having userland provide the signal trampoline:

* struct sigacts gets a new sigact_sigdesc structure, which has the
sigaction and the trampoline/version. Version 0 means "legacy kernel
provided trampoline". Other versions are coordinated with machine-
dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions. Instead,
sendsig() looks up the handler by peeking in the sigacts for the
process getting the signal (since it has to look in there for the
trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later. Kernel
version not bumped; we will ride the 1.6C bump made recently.

whitespace fixes

branches: 1.7.2;
make signal array handling uniform, and put signal arrays in a separate
file. This is simular to errno array handling.

branches: 1.6.2;
Adapt for changes to limux_old_extra_to_native_sigset() and
native_to_linux_old_extra_sigset().

linux_sys_rt_sigreturn is currently marked UNIMPL, so leave the stub out.

- add a real linux_sys___sysctl because the mib numbers are different.
implement only the kernel version getting entries.
- make the signal conversion functions consistent; dest is arg 1.
- make linux_fakedev deal with block and char devices differently.
- add linux_sys_ugetrlimit, and flesh out the regular get/setrlimit so
that they work properly.
- add linux_mmap2 [untested].
- bump kernel to 2.4.18, and make the date be valentine's day :-)
- linux_sys_*stat64 family was totally busted. Fix it.

tested only on i386.

Status:
gdb, telnet, work
jdk-1.4.0 extractor works, jdk still coredumps.

christos

branches: 1.3.2;
We shouldn't need an icache sync when catching a signal, so don't bother.

More-or-less working signal handling for Linux processes on ARM.

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

G/C some old code that was for acorn26

Do not uselessly include <sys/malloc.h>.

branches: 1.31.4;
Use <arm/locore.h>

branches: 1.30.2; 1.30.4;
Rename process_frame to lwp_trapframe

branches: 1.29.8; 1.29.16;
many changes for COMPAT_LINUX:
- update the linux syscall table for each platform.
- support new-style (NPTL) linux pthreads on all platforms.
clone() with CLONE_THREAD uses 1 process with many LWPs
instead of separate processes.
- move the contents of sys__lwp_setprivate() into a new
lwp_setprivate() and use that everywhere.
- update linux_release[] and linux32_release[] to "2.6.18".
- adjust placement of emul fork/exec/exit hooks as needed
and adjust other emul code to match.
- convert all struct emul definitions to use named initializers.
- change the pid allocator to allow multiple pids to refer to the same proc.
- remove a few fields from struct proc that are no longer needed.
- disable the non-functional "vdso" code in linux32/amd64,
glibc works fine without it.
- fix a race in the futex code where we could miss a wakeup after
a requeue operation.
- redo futex locking to be a little more efficient.

branches: 1.28.2; 1.28.4;
Use lwp_getpcb() in compat code, clean from struct user.

branches: 1.27.2;
Remove clause 3 and 4 from TNF licenses

branches: 1.26.2;
Merge proc::p_mutex and proc::p_smutex into a single adaptive mutex, since
we no longer need to guard against access from hardware interrupt handlers.

Additionally, if cloning a process with CLONE_SIGHAND, arrange to have the
child process share the parent's lock so that signal state may be kept in
sync. Partially addresses PR kern/37437.

branches: 1.25.6; 1.25.8;
Make this compile again.

Convert all the system call entry points from:
int foo(struct lwp *l, void *v, register_t *retval)
to:
int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

branches: 1.23.4;
ANSIfy most of the function definitions in sys/compat (but not ndis).
All by the magic of sed ...

branches: 1.22.8; 1.22.10; 1.22.18;
Remove duplicate #include <sys/param.h>,
and pull in the <sys/cdefs.h> needed for __KERNEL_RCSID

From: Slava Semushin <php-coder@altlinux.ru>

branches: 1.21.2; 1.21.4; 1.21.6;
fix caddr_t fallout.

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

branches: 1.19.2;
Merge newlock2 to head.

branches: 1.18.2;
Use VALID_R15_PSR() to check the context we're restoring in
linux_sys_sigreturn(). Somehow this got missed when I introduced that macro.

branches: 1.17.4; 1.17.8;
merge ktrace-lwp.

need linux_syscallargs.h to compile, and remove inline function.

branches: 1.15.2;
Define linux_usertrap function, and set it in struct emul. For all
but amd64, it just returns 0, doing nothing.

For amd64, it implements vsyscalls through cheating: if the faulting
address is in the vsyscall area (which is statically known on Linux/amd64),
and the intruction pointer is too, it must have been a vsyscall. In that
case, retrieve the return address from the user stack, fix up %rip and
%rsp, and just execute the normal system call. It will return as if
the vsyscall has been executed.

nuke trailing whitespace

branches: 1.13.8; 1.13.10;
Adapt ARM Linux compat code to deal with SIGINFO.

Fix "constify sendsig/trapsignal" fallout for non-siginfo'd archs. Test
compiled on most architectures.

branches: 1.11.2;
Merge the nathanw_sa branch.

Don't include <sys/map.h>.

Add kernel support for having userland provide the signal trampoline:

* struct sigacts gets a new sigact_sigdesc structure, which has the
sigaction and the trampoline/version. Version 0 means "legacy kernel
provided trampoline". Other versions are coordinated with machine-
dependent code in libc.
* sigaction1() grows two more arguments -- the trampoline pointer and
the trampoline version.
* A new __sigaction_sigtramp() system call is provided to register a
trampoline along with a signal handler.
* The handler is no longer passed to sensig() functions. Instead,
sendsig() looks up the handler by peeking in the sigacts for the
process getting the signal (since it has to look in there for the
trampoline anyway).
* Native sendsig() functions now select the appropriate trampoline and
its arguments based on the trampoline version in the sigacts.

Changes to libc to use the new facility will be checked in later. Kernel
version not bumped; we will ride the 1.6C bump made recently.

whitespace fixes

branches: 1.7.2;
make signal array handling uniform, and put signal arrays in a separate
file. This is simular to errno array handling.

branches: 1.6.2;
Adapt for changes to limux_old_extra_to_native_sigset() and
native_to_linux_old_extra_sigset().

linux_sys_rt_sigreturn is currently marked UNIMPL, so leave the stub out.

- add a real linux_sys___sysctl because the mib numbers are different.
implement only the kernel version getting entries.
- make the signal conversion functions consistent; dest is arg 1.
- make linux_fakedev deal with block and char devices differently.
- add linux_sys_ugetrlimit, and flesh out the regular get/setrlimit so
that they work properly.
- add linux_mmap2 [untested].
- bump kernel to 2.4.18, and make the date be valentine's day :-)
- linux_sys_*stat64 family was totally busted. Fix it.

tested only on i386.

Status:
gdb, telnet, work
jdk-1.4.0 extractor works, jdk still coredumps.

christos

branches: 1.3.2;
We shouldn't need an icache sync when catching a signal, so don't bother.

More-or-less working signal handling for Linux processes on ARM.

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