Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Merge ^/head r343956 through r344177.

sh: Restore $((x)) error checking after fix for $((-9223372036854775808))

SVN r342880 was designed to fix $((-9223372036854775808)) and things like
$((0x8000000000000000)) but also broke error detec

sh: Restore $((x)) error checking after fix for $((-9223372036854775808))

SVN r342880 was designed to fix $((-9223372036854775808)) and things like
$((0x8000000000000000)) but also broke error detection for values of
variables without dollar sign ($((x))).

For compatibility, overflow in plain literals continues to be ignored and
the value is clamped to the boundary (except 9223372036854775808 which is
changed to -9223372036854775808).

Reviewed by: se (although he would like error checking to be removed)
MFC after: 2 weeks
X-MFC-with: r342880
Differential Revision: https://reviews.freebsd.org/D18926

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Merge from head@274682

IFC @r271694

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Sync to HEAD@r270409.

sh: Remove two redundant (uintmax_t) casts.

Submitted by: jmallett

Merge head from 7/28

sh: Mask off shift distance (<< and >>) in arithmetic.

In C, shift distances equal to or larger than the number of bits in the
operand result in undefined behaviour. As part of eliminating undefined

sh: Mask off shift distance (<< and >>) in arithmetic.

In C, shift distances equal to or larger than the number of bits in the
operand result in undefined behaviour. As part of eliminating undefined
behaviour in arithmetic, mask off the distance like Java and JavaScript
specify and C on x86 usually does.

Assumption: conversion from unsigned to signed retains the two's complement
bits.
Assumption: uintmax_t has no padding bits.

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sh: Avoid undefined behaviour shifting negative values left in arithmetic.

With i386 base clang, arith_yacc.o remains unchanged.

MFC

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

Add prototypes, ANSIfy functions definitions to reduce WARNS=6 output.

IFC @230489 (pending review).

IFC @ r227804

Pull in the virtio drivers from head.

sh: Remove undefined behaviour due to overflow in +/-/* in arithmetic.

With i386 base gcc and i386 base clang, arith_yacc.o remains unchanged.

Integrate from Head into ZFSD feature branch as of revision r224141.

IFC @ r223696 to pick up dfr's userboot

MFC

IFC @ r222830

sh: Include <limits.h> instead of non-standard <sys/limits.h>.

MFC

sh: Remove the "exp" builtin.

The "exp" builtin is undocumented, non-standard and not very useful.

If exp's return value is not used, something like
VAR=$(exp EXPRESSION)
is equivalent to
VAR=$((EX

sh: Remove the "exp" builtin.

The "exp" builtin is undocumented, non-standard and not very useful.

If exp's return value is not used, something like
VAR=$(exp EXPRESSION)
is equivalent to
VAR=$((EXPRESSION))
except that errors in the expression are fatal and quoting special
characters is not needed in the latter case.

If exp's return value is used, something like
if exp EXPRESSION >/dev/null
can be replaced by
if [ $((EXPRESSION)) -ne 0 ]
with similar differences.

The exp-run showed that "let" is close enough to bash's and ksh's builtin
that removing it would break a few ports. Therefore, "let" remains in 9.x.

PR: bin/104432
Exp-run done by: pav (with some other sh(1) changes)

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MFC