Ansify function definitions.

Rename mips64's trap_frame into trapframe.

For coherency with other archs and in order to use it in MI code.

ok visa@, tobiasu@

Make sure ptrace_sstep(,0) actually clears breakpoints, by replacing the
ptrace guts with a logic similar to what the alpha port does.

Replace the old floating point completion code with a C interface to the
MI softfloat code, implementing all MIPS IV specified floating point
operations.
Tested on R5000, R10000, R14000 and Loongson2

Replace the old floating point completion code with a C interface to the
MI softfloat code, implementing all MIPS IV specified floating point
operations.
Tested on R5000, R10000, R14000 and Loongson2F.

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Don't #include <sys/user.h> into files that don't need the stuff
it defines. In some cases, this means pulling in uvm.h or pcb.h
instead, but most of the inclusions were just noise. Tested on
alpha

Don't #include <sys/user.h> into files that don't need the stuff
it defines. In some cases, this means pulling in uvm.h or pcb.h
instead, but most of the inclusions were just noise. Tested on
alpha, amd64, armish, hppa, i386, macpcc, sgi, sparc64, and vax,
mostly by krw and naddy.
ok krw@

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MP-safe FPU handling. ok miod@

Make sure than ptrace functions never return a non-zero value in the zero
register.

Completely overhaul interrupt handling on sgi. Cpu state now only stores a
logical IPL level, and per-platform (IP27/IP30/IP32) code will from the
necessary hardware mask registers.

This allows the

Completely overhaul interrupt handling on sgi. Cpu state now only stores a
logical IPL level, and per-platform (IP27/IP30/IP32) code will from the
necessary hardware mask registers.

This allows the use of more than one interrupt mask register. Also, the
generic (platform independent) interrupt code shrinks a lot, and the actual
interrupt handler chains and masking information is now per-platform private
data.

Interrupt dispatching is generated from a template; more routines will be
added to the template to reduce platform-specific changes and share as much
code as possible.

Tested on IP27, IP30, IP32 and IP35.

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Drop almost unused <machine/psl.h> on sgi; move USERMODE() definition from
there to trap.c which is its only user. This also cleans up multiple
inclusion of <machine/cpu.h> (because <machine/psl.h> i

Drop almost unused <machine/psl.h> on sgi; move USERMODE() definition from
there to trap.c which is its only user. This also cleans up multiple
inclusion of <machine/cpu.h> (because <machine/psl.h> includes it) in many
places.

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In addition to cop0 sr, prevent cop0 ic from being modified in
process_write_regs().

No need to include <machine/pte.h> here.

Do not allow userland to change cop0 SR via ptrace; from NetBSD.

Fix handling of floating-point registers in PT_{GET|SET}REGS.
ok miod@

Un-__P.

ok pefo@

spacing

spacing

Various fixes and cleanups from miod@, tested and OK.

initial mips64