CVS log for src/sys/arch/hppa/hppa/trap.c

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

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).

PR/57261: hppa should be converted to __HAVE_SYSCALL_INTERN

Provide syscall_intern and use the md_syscall in syscall trap handling.

Remove unnecessary inclusion of <net/netisr.h>.

Pull up following revision(s) (requested by skrll in ticket #1468):

	sys/arch/hppa/hppa/trap.c: revision 1.120
	sys/arch/hppa/include/ptrace.h: revision 1.11-1.12 (via patch)

Define a PTRACE_ILLEGAL_ASM

Match up PTRACE_BREAKPOINT_ASM with PTRACE_BREAKPOINT which is the
gdb breakpoint instruction.

Only report the SSBREAKPOINT break instruction as SIGTRAP/TRAP_TRACE. All
other break instructions will be reported as SIGTRAP/TRAP_BRKPT
This fixes a mistake I made back in 2008.

PR/56866: hppa: kernel gets confused between actual breakpoints and
single-step breakpoints

Pull up following revision(s) (requested by skrll in ticket #1466):

	sys/arch/hppa/hppa/trap.c: revision 1.119

Handle 'NA' (non-access) traps for the lpa and probe instructions.  The
change is inspired by OpenBSD with a bunch of my own, mainly stylistic,
changes.

Thanks to Tom Lane for the analysis.

PR/56118: sporadic app crashes in HPPA -current

Only report the SSBREAKPOINT break instruction as SIGTRAP/TRAP_TRACE. All
other break instructions will be reported as SIGTRAP/TRAP_BRKPT

This fixes a mistake I made back in 2008.

PR/56866: hppa: kernel gets confused between actual breakpoints and single-step breakpoints

Handle 'NA' (non-access) traps for the lpa and probe instructions.  The
change is inspired by OpenBSD with a bunch of my own, mainly stylistic,
changes.

Thanks to Tom Lane for the analysis.

PR/56118: sporadic app crashes in HPPA -current

Whitespace

fix various typos in comments, mainly origional->original,
extened->extended, incomming->incoming.

s/ be be / be /

Sync with bouyer-xenpvh-base2 (HEAD)

Pull up following revision(s) (requested by skrll in ticket #1542):

	sys/arch/hppa/hppa/trap.c: revision 1.115

Fix KASSERT that has been incorrect since revision 1.85 from 10 years
ago.

Pull up following revision(s) (requested by skrll in ticket #854):

	sys/arch/hppa/hppa/trap.c: revision 1.115

Fix KASSERT that has been incorrect since revision 1.85 from 10 years
ago.

Fix KASSERT that has been incorrect since revision 1.85 from 10 years
ago.

Merge changes from current as of 20200406

Simplify userret function signature.  From ad@

PR port-sparc/54718 (sparc install hangs since recent scheduler changes)

- userret() must be called every time we return to user, it's not optional.
- If clearing the AST with interrupts off, you must loop over userret().

mi_userret(): take care of calling preempt(), set spc_curpriority directly,
and remove MD code that does the same.

Sync with HEAD

Trailing whitespace

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.

Overhaul the API used to fetch and store individual memory cells in
userspace.  The old fetch(9) and store(9) APIs (fubyte(), fuword(),
subyte(), suword(), etc.) are retired and replaced with new ufetch(9)
and ustore(9) APIs that can return proper error codes, etc. and are
implemented consistently across all platforms.  The interrupt-safe
variants are no longer supported (and several of the existing attempts
at fuswintr(), etc. were buggy and not actually interrupt-safe).

Also augmement the ucas(9) API, making it consistently available on
all plaforms, supporting uniprocessor and multiprocessor systems, even
those that do not have CAS or LL/SC primitives.

Welcome to NetBSD 8.99.37.

Rework the fork(2)/vfork(2) event signalling under ptrace(2)

Remove the constraint of SIGTRAP event being maskable by a tracee.

Now all SIGTRAP TRAP_CHLD events are delivered to debugger.

This code touches MD specific logic and the child_return routine.
It's an intermediate step with a room for refactoring in future and
right now the least invasive approach. This allows to assert expected
behavior in already existing ATF tests and make the code prettier
in future keeping the same semantics. Probably there is a need for a MI
wrapper of child_return for shared functionality between ports.

update from HEAD

Sync with HEAD

Send SIGBUS when accessing mmap() past end of file (handle EINVAL in fault
path). While there, handle ENOMEM as well.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Move to a flat space register convention. %sr[4-7] are all now the space
number allocated to the process.  gcc produces (slightly) better code
with this convention.

Retain backwards compatiblity.

Welcome to 6.99.36

Simplify cpu_spawn_return - setregs has done all the work already.

Change a few __unused to __diagused/__debugused

Use __unused on a variable used in a KASSERT

sync with head

Use sy_invoke

sync with head.

sync to latest -current.

Pull up following revision(s) (requested by skrll in ticket #196):
	sys/arch/hppa/hppa/trap.c: revision 1.101
Pass the trap address in ksi_addr without privilege bits.
Previously GDB would get confused by the trap address given when hitting
the _rtld_debug_state breakpoint.

Pass the trap address in ksi_addr without privilege bits.

Previously GDB would get confused by the trap address given when hitting
the _rtld_debug_state breakpoint.

sync with head

unifdef FPEMUL. All our supported systems have an FPU.

Pull up following revision(s) (requested by skrll in ticket #114):
	sys/arch/hppa/hppa/trap.c: revision 1.99
	sys/arch/hppa/hppa/vm_machdep.c: revision 1.51
	sys/arch/hppa/hppa/vm_machdep.c: revision 1.52
Deal with setting of space registers and protection ids for posix_spawn.
Thanks to martin for the help.
Remove WIP code.

sync to latest -current

Deal with setting of space registers and protection ids for posix_spawn.

Thanks to martin for the help.

sync to -current.

Remove COMPAT_SA / KERN_SA.  Welcome to 6.99.3!
Approved by core@.

merge to -current.

Add missing MD code for posix_spawn

Sync with HEAD.

sync with head

Sync with HEAD

Make some more information (psw/fpu_state) per cpu.

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>.

#if 0 out the trap checks around tf_iioq_{head,tail}.  The sti(4) code
can/will trigger them.

Sync with HEAD.

sync with head.

fix hppa ucas_*():
 - "ret" is a kernel-space pointer.
 - move the ucas RAS check from the device interrupt path
   to the page-fault path.

sync with head

Fix previous.

Pull change across from OpenBSD:

Make single stepping a system call work.  Instead of single stepping
through the syscall gateway page, which doesn't work since that page is
shared between process, this makes us step over that bit by setting a
breakpoint on the instruction where the system call returns.

sync with head

Sync with HEAD.

SANITY output tweak.

KNF

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

Include SSBREAKPOINT in the PTRACE #ifdef/#endif.

Add md_astpending to struct mdlwp and use it.

Make cpl, ipending, and intr_depth per CPU values.

Correct the list of traps that we need to get the va and space from
ii[os]q.

From OpenBSD.

Wrap long line.

Whitespace / comment formatting.

Improve the output from frame_sanity_check.

fix copy{in,out}{,str}() to return the error returned by uvm_fault().
fixes PR 41813.

The FP regs are accessed in both physical and virtual modes.  Make sure
they're allocated in directly mapped memory to avoid aliasing problems
and unnecessary cache flushing.

Fix various names and references. If we ever directly map the uarea and
pcb we can change things at that point.

Significantly helps my J210 (PA7200).

Mostly from OpenBSD.

Start at the first, not the second, exception register.

Comment formating.

sync with head

Oops. Whitespace in previous.

Remove a cast by fixing a printf format.

Reformat a comment.

Minor tweaks.

Use __arraycount

Use pmap_extract instead of kvtop.

Tweak astpending handling.

Check cpl level has returned to entry value when leaving trap/syscall.

From OpenBSD.

Add a comment.

Rename type_raw to trapnum and use in a couple more places.

Reduces diff to OpenBSD.

Count traps in uvmexp. Reduces diff to OpenBSD.

Update 64bit arg handling to use the flags in the syscall table.

Only do trace_enter/trace_exit if we're tracing.

curlwp is never NULL now. Sprinkle KASSERT just in case.

Fix DEBUG build.  Hi rmind.

- Use uvm_lwp_setuarea() instead of directly setting address to lwp_t::l_addr.
- Replace most remaining uses of l_addr with uvm_lwp_getuarea() or lwp_getpcb().
- Amend assembly in ports where it accesses PCB via struct user.
- Rename L_ADDR to L_PCB in few places.  Reduce sys/user.h inclusions.

Use lwp_getpcb() on hppa and ia64, clean from struct user usage.

Follow upstream license changes for files with Michael Shalayeff's
copyright.  In most cases, this means dropping the 3rd and 4th clauses.

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Merge nick-hppapmap.

This is a port of the OpenBSD pmap and trap handling code to get us

        - Performance boost on some/all machines.
        - Well on the way to PA2.0 (in 32bit mode) support. Several
          machines probe hardware, but fail sometime after interrupts
          are enabled.

Other things changed / fixed on the branch are

        - update autoconf to use the OpenBSD code.
        - com @ dino is very close to being supported.
        - HPPA_REDZONE has been replaced with a working redzone which
          is enabled with DIAGNOSTIC.
        - UPAGES has been halved in size.
        - power(4) from OpenBSD to fix a few bugs.
        - updated list of modules from OpenBSD.
	- initial ports of uturn(4), astro(4) and elroy(4).
	- update some copyrights (remove advertising clause, etc.)

Thanks to mjf for some of the above, testing and listening.

Sync with HEAD.

Fixup two more syscalls with 64-bit args.

Remove reference to script that is supposed to do this automatically - I
don't have it.

Fixes PR/41185.

Fixup redzone stuff and enable it if DIAGNOSTIC.

Sync with HEAD.

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

Fix a typo I saw when turning on TRAPDEBUG. struct pmap doesn't have
a pmap_space member, it should be pm_space.

Commit work in progress.

Provide a small inline wrapper for sysent::sy_call() and use it to store
the active syscall description in struct lwp. To be used at some future
point to prevent unloading of modules that provide syscalls, while the
syscalls are in use.

Sync with HEAD.

Merge wrstuden-revivesa into HEAD.

Add a new vp-private flag, SAVP_FLAG_DELIVERING. This flag indicates
that the vp is in the process of delivering a new-thread upcall.
This is a BLOCKED or NEWPROC upcall. Do NOT generate any BLOCKED
upcalls while this is set. Set it at the end of sa_switchcall()
and clear it at syscall entry. Sadly, I have found no other
way to handle this. The old SA interface has no way for
userland to acknowledge that it got the upcall, so use syscall
entry as the indicator that libpthread got it.

This addresses the issue seen on current-users with firefox
dying with a blockedgen != unbockedgen error. The problem is we
deliver a BLOCKED upcall, but between the end of userret()
and when the CPU indicates that it's running in user mode, we take
a page fault. Said page fault blocks, blocking upcall delivery.
The original block, however, was short-lived, and the UNBLOCK
happens shortly. It happens before libpthread actually notices
the BLOCKED upcall. Boom!

Unfortunately a LOCKDEBUG/DIAGNOSTIC kernel still dies before
firefox opens. However this new issue is with uvm code calling
mtsleep when not holding a correct lock; sa_switch() is exploding
at KASSERT(lwp_locked(l, NULL)); before it's done _anything_.

Also, while here, add sa_system_disabled. This is an integer
that we examine when starting SA for a proc. If it's non-zero,
we error out. Once this is hooked into sysctl, you'll be able to
disable SA w/o recompiling.

Change how we make SA threads not generate upcalls. Instead of clearing
LW_SA, use a private flag, LP_SA_NOBLOCK, that we set when we want
to not generate upcalls. This means we do NOT need to lock (l)
(ourselves) to set it.

Adjust tests that look at LW_SA. Now, we are an upcall-generating
lwp if ((l->l_flag & LW_SA) && (~l->l_pflag & LP_SA_NOBLOCK)).

Introduce code pattern to set & remember this:

	f = ~l->l_pflag & LP_SA_NOBLOCK;
	l->l_pflag |= LP_SA_NOBLOCK;

	...

	/* f is now LP_SA_NOBLOCK if it wasn't set in l_pflag before */

	l->l_pflag ^= f;

I updated a lot of the trap handlers to do trap handling iff LP_SA_NOBLOCK
is not set. I tried to figure out if the trap handler could be triggered
for user-based faults as opposed to kernel faults to user addresses, and
only look at LP_SA_NOBLOCK for the latter.

Above is a result of discussions with rmind at to reduce lock twiddling.

Also, per same discussions, add locking to sys_sa_preempt(). p_lock is
the lock we want.

Also, per same discussions, remove use of LSSUSPENDED as a thread state.
We needed to use it when we were emulating the 4.X and previous behavior
of hiding cached threads. For the moment, we now have them instead
remain visible to all and have them sleeping on the "lwpcache" wait
channel.

sa_newcachelwp(): sa_putcachelwp() wants savp_mutex held, not p_lock.

Tweak some comments.

Re-add cpu_upcall() and page fault code. i386 kernels now compile.
They don't boot, but that seems to be a consequence of current from the
day this branch was started.

Sync with HEAD.

sync with head.

sync with head.

Initial checkin of re-adding SA. Everything except kern_sa.c
compiles in GENERIC for i386. This is still a work-in-progress, but
this checkin covers most of the mechanical work (changing signalling
to be able to accomidate SA's process-wide signalling and re-adding
includes of sys/sa.h and savar.h). Subsequent changes will be much
more interesting.

Also, kern_sa.c has received partial cleanup. There's still more
to do, though.

Remove clause 3 and 4 from TNF licenses

sync with HEAD

Sync with HEAD.

sync with head.

Remove the 'args' parameter to 'trace_exit()' it is no longer used.
Instead of passing the (un)real system call code and syscall table pointer,
just pass the number of arguments - which is what ktrace really wants.
Ride forthcoming 4.99.53

sync with head

Sync with HEAD

KNF

Correct a comment.

Sync with HEAD

Various improvements to the hppa kernel for gdb.

	- add the useful space and control registers to struct reg
	- update process_{read,write}_regs accordingly
	- use MID_HPPA in core dumps.
	- dump the fp regs into cores.
	- add single stepping support from OpenBSD.

sync with HEAD

Sync with HEAD

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

Sync with HEAD.

sync with head.

Sync with HEAD

sync with HEAD

Sync with HEAD.

Don't set l_usrpri / spc_curpriority here. mi_userret() does it.

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.

Make want_resched a member of cpu_info.

sync with head.

Sync with HEAD.

Sync w/ NetBSD-4-RC_1

Sync with HEAD.

Sync with HEAD.

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

Sync with head.

Pull up following revision(s) (requested by skrll in ticket #758):
	sys/arch/hppa/hppa/trap.c: revision 1.45
Fix up the frame sanity checking to not bitch when taking interrupts in
the sti ROM code.
Fixes PR/34715.
Thanks to David H. Gutteridge.

Sync with HEAD.

Sync with head.

Sync with head.

Fix up the frame sanity checking to not bitch when taking interrupts in
the sti ROM code.

Fixes PR/34715.

Thanks to David H. Gutteridge.

Update to HEAD.

Minor KNF and make some output a bit easier to read.

merge yamt-idlelwp branch.  asked by core@.  some ports still needs work.

from doc/BRANCHES:

	idle lwp, and some changes depending on it.

	1. separate context switching and thread scheduling.
	   (cf. gmcgarry_ctxsw)
	2. implement idle lwp.
	3. clean up related MD/MI interfaces.
	4. make scheduler(s) modular.

Backout previous - the problem isn't in the syscall code not saving things
correctly. It's in pmap_activate which can overwrite the saved space
registers when switching back to the lwp if it was switched away from at
a critical point, e.g. in the syscall gateway page.

Not sure of a correct fix at the moment.

Add the hack from OpenBSD for trap while in the SYSCALLGATE page. Add the
following comment to explain what's going on.

	In case we were interrupted from the syscall gate page
	treat this as we were not really running user code anymore

	The problem is that if we preempt when returning from this
	trap the interspace branch setting of IASQ to HPPA_SID_KERNEL
	is not picked up by the syscall code. Instead, it will attempt
	to return into the syscall gate page with the user space id
	causing a (fatal) ITLB trap for the process.

The syscall handler should probably be fixed.

More cleanup/improvement. Still WIP.

Adapt hp700/hppa to yamt-idlelwp.

XXX Interrupts can fire before curlwp = new in sched_switch_unlock.
XXX This triggers the DEBUG check in sys/arch/hppa/hppa/trap.c:451

Sync with HEAD.

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

Remove hppa_{round,trunc}_page.

sync with head.

Merge newlock2 to head.

Remove support for SA. Ok core@.

Make hp700 compile.

Sync with head.

Pull up following revision(s) (requested by skrll in ticket #323):
	sys/uvm/uvm_unix.c: revision 1.37
	sys/arch/hppa/hppa/trap.c: revision 1.39
Update uvm_grow to support stacks that grow upwards.
Use on hppa and fix a bug in the hppa trap handler.

sync with head.

sync with head.

Update uvm_grow to support stacks that grow upwards.

Use on hppa and fix a bug in the hppa trap handler.

Sync with head.

sync with head

Make this compile without KTRACE.

From Sergey Svishchev in a private email.

sync with head

sync with head.

Fix a spello in a debug message.

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.

Merge from HEAD.

Fix use of user_backtrace. It takes a lwp pointer now.

sync with head.

Sync with head.

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

sync with head.

P_PROFIL is held in p_flag of struct proc so test for it there.

Sync with head.

sync with head - hopefully this will work

sync with head.

adapt to uvm_fault() interface cleanup: kill the useless 3rd argument

sync with head.

file trap.c was added on branch elad-kernelauth on 2006-04-19 02:32:44 +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.

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

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Remove "bad" label no longer in use.

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.

add additional args to frame_sanity_check() so we can log which
context it was called from and the trap type (if called from trap()).

check pcb_onfault for kernel T_DATALIGN traps (for ddb).

sync with -current

sync with head.  xen and whitespace.  xen part is not finished.

Sync with HEAD.

Hi Perry!

user_backtrace() is used if DEBUG or USERTRACE is defined, but not DIAGNOSTIC.

Correct some ktr* calls to pass a struct lwp *

Sync with HEAD.

handle T_CONDITION traps (by sending SIGFPE).
fix T_EXCEPTION code to handle the other FP major opcodes.

Sync with HEAD

real siginfo support.

FPU fixes and improvements, adapted from openbsd:
 - handle exceptions correctly
 - emulation of unimplemented instructions (eg. on PA-7300LC)

use mi_userret().

clear pcb_onfault before calling uvm_fault() and restore it after.
remove some debug code that actually makes debugging harder.

redo rev. 1.13, handle curlwp being NULL correctly.

for instruction TLB miss traps, process the fault with VM_PROT_EXECUTE
instead of VM_PROT_READ (to support non-executable mappings).

To the rest of the kernel, pretend that hppa supports SIGINFO.
There are still only "sigcontext" stackframes passed to the user,
but at least we can clean up the MI sources now.

add kernel part of concurrency support for SA on MP systems
- move per VP data into struct sadata_vp referenced from l->l_savp
  * VP id
  * lock on VP data
  * LWP on VP
  * recently blocked LWP on VP
  * queue of LWPs woken which ran on this VP before sleep
  * faultaddr
  * LWP cache for upcalls
  * upcall queue
- add current concurrency and requested concurrency variables
- make process exit run LWP on all VPs
- make signal delivery consider all VPs
- make timer events consider all VPs
- add sa_newsavp to allocate new sadata_vp structure
- add sa_increaseconcurrency to prepare new VP
- make sys_sa_setconcurrency request new VP or wakeup idle VP
- make sa_yield lower current concurrency
- set sa_cpu = VP id in upcalls
- maintain cached LWPs per VP

de-__P, remove register, ansify.

In trap(), curlwp could be NULL so don't refer it implicitly.

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

NULL -> 0 for preempt() argument.

add MD part of SA/pthread pagefault handling on hppa

update for LWPs, and some lite cleanup.

__KERNEL_RCSID()

Use PAGE_SIZE rather than NBPG.

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.

Add a realcode argument to trace_enter and ktrsyscall. realcode is the
original system call number, which can be negative for a Mach trap.
We cannot just replace code by realcode, because ktrsyscall uses it as
an index in the system call table, thus crashing the kernel when the
value is negative.

sync kqueue branch with HEAD

catch up with -current.

Since trap_kdebug() may be a macro, be sure to cast to void when not
using its result.

catch up with -current.

catch up with -current.

file trap.c was added on branch gehenna-devsw on 2002-07-14 17:47:15 +0000

Now include the HPPA trap number in a user backtrace, and display
backtraces for more traps.

catch up with -current on kqueue branch

file trap.c was added on branch kqueue on 2002-06-23 17:37:06 +0000

MD systrace gluons.

Added files to support generic HP PA-RISC based machines.  hp700-specific
files to follow.