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ACC ARM code gen: Implement global variables.

Collapsed the inc/dec codegen into the loadEAX function, because it
allows us to generate better code for inc/dec'ing a global variable
on ARM, because we don't have to load the variable's address twice.

resolved conflicts w/ b415390e74deae0f4c3eb43330c9f8708281acc5 merge

Make /system/xbin/tcpdump setuid root.

am e398151e: Merge change 1694 into donut

Merge commit 'e398151e7830510f27305cc1cb8f9a0510106f9a'

* commit 'e398151e7830510f27305cc1cb8f9a0510106f9a':
nexus: Flesh out VPN support a bit more, cleanup service handling

am dee68663: Merge change 1693 into donut

Merge commit 'dee68663724c7117a51eb3af3d9390e00af832f5'

* commit 'dee68663724c7117a51eb3af3d9390e00af832f5':
libsysutils: Introduce 'ServiceManager', for starting/stopping init services

Add license, document language changes.

Merge change 1778 into donut

* changes:
init: Create new 'vpn' user/group and set owner of '/dev/tun' to it.

Merge change 1694 into donut

* changes:
nexus: Flesh out VPN support a bit more, cleanup service handling

Merge change 1693 into donut

* changes:
libsysutils: Introduce 'ServiceManager', for starting/stopping init services

init: Create new 'vpn' user/group and set owner of '/dev/tun' to it.

Signed-off-by: San Mehat <san@google.com>

nexus: Flesh out VPN support a bit more, cleanup service handling

Signed-off-by: San Mehat <san@google.com>

libsysutils: Introduce 'ServiceManager', for starting/stopping init services

Signed-off-by: San Mehat <san@google.com>

am 722a5c04: Add support for "standalone months" to tztime\'s strftime().

Merge commit '722a5c0462f38827f4097065bfc3826b9e0e9fb4'

* commit '722a5c0462f38827f4097065bfc3826b9e0e9fb4':
Add support for "standalone months" to tztime's strftime().

Merge commit 'goog/master' into merge_master

Merge change 1741

* changes:
ACC: Arm code gen improvements ++/--, &, odds and ends

Merge change 1740

* changes:
Implement <, >, ==, !=, >= <=, &&, and ||.

ACC: Arm code gen improvements ++/--, &, odds and ends

Added C++-style "//..end-of-line" comments, since I kept trying to use them when writing
test programs.

The biggest known missing piece is global variables.

Add support for "standalone months" to tztime's strftime().

The idea here is that some languages need a different form of the month
name in constructions like "January 2" than in "January 2009", since the
one in the "January 2" case really means "of January." So with this change,
a format string of "%-B" will use the standalone month, while "%B" will
continue to use the format month.

Implement <, >, ==, !=, >= <=, &&, and ||.

Merge change 1714

* changes:
ACC ARM code gen: Implement local variables, function args

ACC ARM code gen: Implement local variables, function args

+ Fix prolog and epilog code.

am c83cd879: init: Fix heap corruption for services with arguments

Merge commit 'c83cd879d45e667fbb4763f18c908928ee9d67d8'

* commit 'c83cd879d45e667fbb4763f18c908928ee9d67d8':
init: Fix heap corruption for services with arguments
toolbox: ifconfig: Implement mtu setting, plus setting interface addr should
toolbox: route: Reflow some of the mess, fix route add parameter names to

init: Fix heap corruption for services with arguments

The 'args' array *must* be the last entry in the structure.

This fixes a longstanding issue (apparently since tc3) where
a service with an argument would corrupt the heap. The more
arguments, the more corruption :|. This will probably also end up
making key-code bound services more reliable (ie: bugreports triggered
via the keyboard)

Signed-off-by: San Mehat <san@google.com>

ACC ARM code gen improvements. printf("Hello, world\n"); works!

+ Improved li to handle all 32-bit values.
+ Implemented push/pop of temp registers during evaluation
+ Implemented the unary and binary easy math operators (+,-,*,<<,>>,|,&,^,~)
+ Implemented global function calling.

toolbox: ifconfig: Implement mtu setting, plus setting interface addr should
implicitly 'up' the iface just like normal ifconfig does.

Also convert tabs -> spaces

toolbox: route: Reflow some of the mess, fix route add parameter names to
match standard route

Signed-off-by: San Mehat <san@google.com>

Merge change 1629

* changes:
ARM codegen: Add disassembler, implement return

Merge change 1628

* changes:
Begin filling in ARM code generator.

Merge change 1627

* changes:
Add stub Arm code generator.

ARM codegen: Add disassembler, implement return

This program works:

main() { return 42; }

The disassembler was borrowed from codeflinger, and just modified enough to compile
under C++ without warnings.

Implemented gsym
Implemented a hack verison of li, only works for -256..255
Implemented gjmp