Merge bde improvements for ddb on x86, mostly for single-stepping and
vm86 mode.

MFC r304085 (by bde):
Fix the variables $esp, $ds, $es, $fs, $gs and $ss in vm86 mode. Fix
PC_REGS() so that printing of instructions works in some useful cases.

MFC r304962 (by bde):
Expand error messages: print symbol names, parentheses and shift tokens,
and negative shift counts. Fix error messages.

MFC r305612 (by bde):
Fix single-stepping of instructions emulated by vm86.

MFC r305661 (by bde):
Give the full syntax of the 'count' arg for all commmands that support
it. Give the full syntax of the 'addr' arg for these commands and some
others. Rename it from 'address' for the generic command. Fix
description of how 'count' is supposed to work for the 'break'
command.

Don't (mis)describe the syntax of the comma for the 'step' command.

Expand the description for the generic command.

Give the full syntax for the 'examine' command. It was also missing
the possible values for the modifier.

MFC r305663 (by bde):
Fix stopping when the specified breakpoint count is reached.

MFC r305665 (by bde):
Pass the trap type and code down from db_trap() to db_stop_at_pc() so
that the latter can easily determine what the trap type actually is
after callers are fixed to encode the type unambigously.

MFC r305807 (by bde):
Use the MI macro TRAPF_USERMODE() instead of open-coded checks for
SEL_UPL and sometimes PSL_VM. Fix logic errors in treating vm86
bioscall mode as kernel mode. The main place checked all the
necessary flags, but put the necessary parentheses for the PSL_VM and
PCB_VM86CALL checks in the wrong place.

MFC r305811 (by bz):
Try to fix LINT builds after r305807.

MFC r305840 (by bde):
Abort single stepping in ddb if the trap is not for single-stepping.

MFC r305862 (by bde):
Ifdef the new dr6 variable for KDB.

MFC r305864 (by bde):
Statically initialize the run mode to the one that will become current
on first entry. Don't reset to the run mode to STEP_NONE when
stopping, and remove STEP_NONE.

MFC r305865 (by bde):
Fix decoding of tf_rsp on amd64, and move TF_HAS_STACKREGS() to the
i386-only section, and fix a comment about the amd64 kernel trapframe
not having stackregs.

MFC r305897 (by bde):
Silently ignore unexpected single-step traps.

MFC r306311 (by bde):
Determine the operand/address size of %cs in a new function
db_segsize(). Use db_segsize() to set the default operand/address
size for disassembling.

Fix db_print_loc_and_inst() to ask for the normal format and not the
alternate in normal operation. Use db_segsize() to avoid trying to
print a garbage stack trace if %cs is 16 bits.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add a small set of logical operators to DDB command language.

This are based on Mach3.
Documentation is pending but has been promised.

Submitted by: Dan Partelly
Reviewed by: adrian, jhb (older version)

Differential Revision: https://reviews.freebsd.org/D4230
RelNotes: yes

ddb: Make use of our roundup() macro when available.

ddb: finish converting boolean values.

The replacement started at r283088 was necessarily incomplete without
replacing boolean_t with bool. This also involved cleaning some type
mismatches and ansifying old C function declarations.

Pointed out by: bde
Discussed with: bde, ian, jhb

ddb: stop boolean screaming.

TRUE --> true
FALSE--> false

Hinted by: NetBSD

Build on Jeff Roberson's linker-set based dynamic per-CPU allocator
(DPCPU), as suggested by Peter Wemm, and implement a new per-virtual
network stack memory allocator. Modify vnet to use the allocator
instead of monolithic global container structures (vinet, ...). This
change solves many binary compatibility problems associated with
VIMAGE, and restores ELF symbols for virtualized global variables.

Each virtualized global variable exists as a "reference copy", and also
once per virtual network stack. Virtualized global variables are
tagged at compile-time, placing the in a special linker set, which is
loaded into a contiguous region of kernel memory. Virtualized global
variables in the base kernel are linked as normal, but those in modules
are copied and relocated to a reserved portion of the kernel's vnet
region with the help of a the kernel linker.

Virtualized global variables exist in per-vnet memory set up when the
network stack instance is created, and are initialized statically from
the reference copy. Run-time access occurs via an accessor macro, which
converts from the current vnet and requested symbol to a per-vnet
address. When "options VIMAGE" is not compiled into the kernel, normal
global ELF symbols will be used instead and indirection is avoided.

This change restores static initialization for network stack global
variables, restores support for non-global symbols and types, eliminates
the need for many subsystem constructors, eliminates large per-subsystem
structures that caused many binary compatibility issues both for
monitoring applications (netstat) and kernel modules, removes the
per-function INIT_VNET_*() macros throughout the stack, eliminates the
need for vnet_symmap ksym(2) munging, and eliminates duplicate
definitions of virtualized globals under VIMAGE_GLOBALS.

Bump __FreeBSD_version and update UPDATING.

Portions submitted by: bz
Reviewed by: bz, zec
Discussed with: gnn, jamie, jeff, jhb, julian, sam
Suggested by: peter
Approved by: re (kensmith)

Prefer prototypes to k&r definitions.

Start each of the license/copyright comments with /*-

Use __FBSDID().

Don't assume that pointers are 4 bytes or sizeof(int) in size. This fixes
the indirection operator ('*') and address examination ('x/a') on
big-endian platoforms for which the above is not true, as well as on
little-endian platforms if the cut-off bits are not 0.

Remove __P.

$Id$ -> $FreeBSD$

Removed unused #includes.

Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Reduced and cleaned up #includes.

Untangled the vm.h include file spaghetti.

Staticized and '#ifdef notused' stuff we don't use.

Completed function declarations and/or added prototypes and/or #includes
to get the prototypes.

Changed some `int's to `boolean_t's. boolean_t's are ints so they are
hard to distinguish from ints.

Converted function headers to old-style. ddb is written in K&R1 C
except where we broke it.

Remove trailing whitespace.

Change all #includes to follow the current Berkeley style. Some of these
``changes'' are actually not changes at all, but CVS sometimes has trouble
telling the difference.

This also includes support for second-directory compiles. This is not
quite complete yet, as `config' doesn't yet do the right thing. You can
still make it work trivially, however, by doing the following:

rm /sys/compile
mkdir /usr/obj/sys/compile
ln -s M-. /sys/compile
cd /sys/i386/conf
config MYKERNEL
cd ../../compile/MYKERNEL
ln -s /sys @
rm machine
ln -s @/i386/include machine
make depend
make

Make the LINT kernel compile with -W -Wreturn-type -Wcomment -Werror, and
add same (sans -Werror) to Makefile for future compilations.

Removed all patch kit headers, sccsid and rcsid strings, put $Id$ in, some
minor cleanup. Added $Id$ to files that did not have any version info, etc

This commit was generated by cvs2svn to compensate for changes in r4,
which included commits to RCS files with non-trunk default branches.

Initial import, 0.1 + pk 0.2.4-B1