linux-kernel - Re: [PATCH v4 3/6] parisc: add system call table generation support

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Message-ID: <20181014010658.GB717@asgard.redhat.com>
Date:   Sun, 14 Oct 2018 03:06:58 +0200
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     Firoz Khan <firoz.khan@...aro.org>
Cc:     linux-parisc@...r.kernel.org,
        "James E . J . Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, arnd@...db.de, deepa.kernel@...il.com,
        marcin.juszkiewicz@...aro.org
Subject: Re: [PATCH v4 3/6] parisc: add system call table generation support

On Fri, Oct 12, 2018 at 03:13:59PM +0530, Firoz Khan wrote:
> diff --git a/arch/parisc/kernel/syscalls/syscall.tbl b/arch/parisc/kernel/syscalls/syscall.tbl
> new file mode 100644
> index 0000000..7c9f268

> +86      common  uselib                          sys_ni_syscall

Again, why is this definition left, while others have been removed?

> +348     common  pwritev2                        sys_pwritev2                    compat_sys_pwritev2
> +349     common  statx                           sys_statx
> +350	common  io_pgetevents			sys_io_pgetevents		compat_sys_io_pgetevents

Tab instead of spaces.

> diff --git a/arch/parisc/kernel/syscalls/syscallhdr.sh b/arch/parisc/kernel/syscalls/syscallhdr.sh
> new file mode 100644
> index 0000000..607d4ca
> --- /dev/null
> +++ b/arch/parisc/kernel/syscalls/syscallhdr.sh
> @@ -0,0 +1,35 @@
> +#!/bin/sh

/bin/sh -efu

> +# SPDX-License-Identifier: GPL-2.0

"export LANG=C", due to usage of sed/grep/sort.

> +
> +in="$1"
> +out="$2"
> +my_abis=`echo "($3)" | tr ',' '|'`
> +prefix="$4"
> +offset="$5"
> +
> +fileguard=_UAPI_ASM_PARISC_`basename "$out" | sed \
> +    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/' \
> +    -e 's/[^A-Z0-9_]/_/g' -e 's/__/_/g'`
> +grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (

grep -E '^[[:xdigit:]Xx]+[[:space:]]+'"${my_abis}" "$in"
sort -n -k1,1

> +    echo "#ifndef ${fileguard}"
> +    echo "#define ${fileguard}"
> +    echo ""

	cat <<-EOF
		#ifndef ${fileguard}
		#define ${fileguard}

	EOF

> +
> +    nxt=0
> +    while read nr abi name entry compat ; do
> +	if [ -z "$offset" ]; then
> +	    echo -e "#define __NR_${prefix}${name}\t$nr"
> +	else
> +	    echo -e "#define __NR_${prefix}${name}\t($offset + $nr)"
> +	fi

echo options are not portable; something like

	printf "#define __NR_%s%s\t(%s + %s)" "${prefix}" "${name}" "${offset}" "${nr}"

> +	nxt=$nr
> +	let nxt=nxt+1

"let" is a bash extension, posix-conformant expression would be

	nxt=$((nr + 1))

(I would also check that nr >= nxt, however)

> +    done
> +
> +    echo ""
> +    echo "#ifdef __KERNEL__"
> +    echo -e "#define __NR_syscalls\t$nxt"
> +    echo "#endif"
> +    echo ""
> +    echo "#endif /* ${fileguard} */"

	cat <<-EOF

		#ifdef __KERNEL__
		# define __NR_syscalls\t${nxt}
		#endif

		#endif /* ${fileguard} */
	EOF

> +) > "$out"
> diff --git a/arch/parisc/kernel/syscalls/syscalltbl.sh b/arch/parisc/kernel/syscalls/syscalltbl.sh
> new file mode 100644
> index 0000000..04abde7
> --- /dev/null
> +++ b/arch/parisc/kernel/syscalls/syscalltbl.sh
> @@ -0,0 +1,46 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +
> +in="$1"
> +out="$2"
> +my_abis=`echo "($3)" | tr ',' '|'`
> +offset="$4"
> +
> +emit() {
> +    nxt="$1"
> +    if [ -z "$offset" ]; then
> +	nr="$2"
> +    else
> +	nr="$2"
> +	nr=$((nr+offset))
> +    fi
> +    entry="$3"
> +
> +    while [ $nxt -lt $nr ]; do

It would break nicely if nxt="-n x -o 1" or something like that.

> +	echo "__SYSCALL($nxt, sys_ni_syscall, )"
> +        let nxt=nxt+1
> +    done
> +    echo "__SYSCALL($nxt, $entry, )"
> +}
> +
> +grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (
> +    if [ -z "$offset" ]; then
> +	nxt=0
> +    else
> +	nxt=$offset
> +    fi
> +
> +    my_abi="$(cut -d'|' -f2 <<< $my_abis)"

	my_abi="${my_abis#*|}"

But it looks like that $my_abis includes parentheses and this code
is broken.

> +    while read nr abi name entry compat ; do
> +	if [ $my_abi = "compat" ]; then
> +	    if [ -z "$compat" ]; then
> +		emit $nxt $nr $entry
> +	    else
> +		emit $nxt $nr $compat
> +	    fi
> +	else
> +	    emit $nxt $nr $entry
> +	fi
> +        let nxt=nxt+1
> +    done
> +) > "$out"
> -- 
> 1.9.1
>