Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.

IFC @ r255459

MFC

Merge from head

sh: Make return return from the closest function or dot script.

Formerly, return always returned from a function if it was called from a
function, even if there was a closer dot script. This was for

sh: Make return return from the closest function or dot script.

Formerly, return always returned from a function if it was called from a
function, even if there was a closer dot script. This was for compatibility
with the Bourne shell which only allowed returning from functions.

Other modern shells and POSIX return from the function or the dot script,
whichever is closest.

Git 1.8.4's rebase --continue depends on the POSIX behaviour.

Reported by: Christoph Mallon, avg

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IFC @ r255209

sh: Remove unnecessary reset functions.

These are already handled by exception handlers.

IFC @ r254014

IFC @ r253862

- change the SI_SUB_RUN_SCHEDULER sysinits in hv_utilc and
hv_netvsc_drv_freebsd.c to SI_SUB_KTHREAD_IDLE, since the
former is no longer in FreeBSD.
The use of these SYSINITs can pro

IFC @ r253862

- change the SI_SUB_RUN_SCHEDULER sysinits in hv_utilc and
hv_netvsc_drv_freebsd.c to SI_SUB_KTHREAD_IDLE, since the
former is no longer in FreeBSD.
The use of these SYSINITs can probably be removed.

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sh: Remove mkinit.

Replace the RESET blocks with regular functions and a reset() function that
calls them all.

This code generation tool is unusual and does not appear to provide much
benefit. I do

sh: Remove mkinit.

Replace the RESET blocks with regular functions and a reset() function that
calls them all.

This code generation tool is unusual and does not appear to provide much
benefit. I do not think isolating the knowledge about which modules need to
be reset is worth an almost 500-line build tool and wider scope for
variables used by the reset functions.

Also, relying on reset functions is often wrong: the cleanup should be done
in exception handlers so that no stale state remains after 'command eval'
and the like.

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IFC @ r253461

IFC @253398

sh: Do not read from stdin if an error occurs during -i -c cmd.

Although using -i with -c does not seem very useful, it seems inappropriate
to read commands from the terminal in this case.

Side eff

sh: Do not read from stdin if an error occurs during -i -c cmd.

Although using -i with -c does not seem very useful, it seems inappropriate
to read commands from the terminal in this case.

Side effect: if the -s -c extension is used and the -s option is turned off
using 'set +s' during the interactive part, the shell now exits after an
error or interrupt. Note that POSIX only specifies -s as option to sh, not
to set.

See also Austin Group issue #718.

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Merge fresh head.

sh: Use O_CLOEXEC and F_DUPFD_CLOEXEC instead of separate fcntl() call.

sync from head

sh: Fix various compiler warnings.

It now passes WARNS=7 with clang on i386.

GCC 4.2.1 does not understand setjmp() properly so will always trigger
-Wuninitialized. I will not add the volatile keyw

sh: Fix various compiler warnings.

It now passes WARNS=7 with clang on i386.

GCC 4.2.1 does not understand setjmp() properly so will always trigger
-Wuninitialized. I will not add the volatile keywords to suppress this.

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IFC @247348.

sh: If a SIGINT or SIGQUIT interrupts "wait", return status 128+sig.

Sync with HEAD.

sh: Remove mkinit's initialization routine.

Instead, call the only init function left directly from main().

MFC @ r241285

IFC @ r242684