[LTP] [PATCH v5 2/3] Add script to generate arch(s) dependant syscalls

[Andrea Cervesato <andrea.cervesato@suse.de>]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Add generate_arch.sh script which can be used to generate arch(s)
dependant syscalls file. The way it works is pretty simple: for each
architecture defined into supported-arch.txt, compile kernel headers,
extract the list of syscalls and generate a .in file containing all of
them, associated with their own syscall's number.
The way syscalls files are generated, passes through a C application
which is automatically checking the availability of the syscalls in
the user space environment.

Reviewed-by: Li Wang <liwang@redhat.com>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 include/lapi/syscalls/{aarch64.in => arm64.in}     |   0
 include/lapi/syscalls/generate_arch.sh             | 211 +++++++++++++++++++++
 .../lapi/syscalls/{loongarch.in => loongarch64.in} |   0
 include/lapi/syscalls/{mips_n64.in => mips64.in}   |   0
 .../lapi/syscalls/{mips_n32.in => mips64n32.in}    |   0
 include/lapi/syscalls/{mips_o32.in => mipso32.in}  |   0
 include/lapi/syscalls/{hppa.in => parisc.in}       |   0
 include/lapi/syscalls/supported-arch.txt           |  12 +-
 8 files changed, 217 insertions(+), 6 deletions(-)

diff --git a/include/lapi/syscalls/aarch64.in b/include/lapi/syscalls/arm64.in
similarity index 100%
rename from include/lapi/syscalls/aarch64.in
rename to include/lapi/syscalls/arm64.in
diff --git a/include/lapi/syscalls/generate_arch.sh b/include/lapi/syscalls/generate_arch.sh
new file mode 100755
index 0000000000000000000000000000000000000000..c88ca945127c3c26162a48babcd6b0f8ca552311
--- /dev/null
+++ b/include/lapi/syscalls/generate_arch.sh
@@ -0,0 +1,211 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# This is an adaptation of the update-tables.sh script, included in the
+# syscalls-table project (https://github.com/hrw/syscalls-table) and released
+# under the MIT license.
+#
+# Author: Andrea Cervesato <andrea.cervesato@suse.com>
+
+KERNELSRC="$1"
+
+# to keep sorting in order
+export LC_ALL=C
+
+if [ -z "$KERNELSRC" ]; then
+	echo "Please provide kernel sources:"
+	echo ""
+	echo "$0 path/to/Linux/kernel/sources"
+	echo ""
+	exit 1
+fi
+
+if [ ! -d "$KERNELSRC" ]; then
+	echo "$KERNELSRC is not a directory"
+	exit 1
+fi
+
+if [ ! -e "${KERNELSRC}/Makefile" ]; then
+	echo "No Makefile in $KERNELSRC directory"
+	exit 1
+fi
+
+TEMP="$(mktemp -d)"
+KVER="$(make -C ${KERNELSRC} kernelversion -s)"
+
+SCRIPT_DIR="$(realpath $(dirname "$0"))"
+SUPPORTED_ARCH="${SCRIPT_DIR}/supported-arch.txt"
+LINUX_HEADERS="${TEMP}/headers"
+
+grab_syscall_names_from_tables()
+{
+	for tbl_file in $(find ${KERNELSRC}/arch -name syscall*.tbl); do
+		grep -E -v "(^#|^$|sys_ni_syscall)" $tbl_file |
+			awk '{ print $3 }' >> ${TEMP}/syscall-names.tosort
+	done
+
+	drop_bad_entries
+}
+
+grab_syscall_names_from_unistd_h()
+{
+	grep -E -h "^#define __NR_" \
+		${LINUX_HEADERS}/usr/include/asm/unistd*.h \
+		${LINUX_HEADERS}/usr/include/asm-generic/unistd.h \
+		>${TEMP}/syscall-names.tosort
+
+	drop_bad_entries
+}
+
+drop_bad_entries()
+{
+	grep -E -v "(unistd.h|NR3264|__NR_syscall|__SC_COMP|__NR_.*Linux|__NR_FAST)" \
+		${TEMP}/syscall-names.tosort |
+		grep -E -v "(__SYSCALL|SYSCALL_BASE|SYSCALL_MASK)" |
+		sed -e "s/#define\s*__NR_//g" -e "s/\s.*//g" |
+		sort -u >${TEMP}/syscall-names.txt
+}
+
+generate_table()
+{
+	echo "- $arch"
+
+	if [ $bits == 32 ]; then
+		extraflags="${extraflags} -D__BITS_PER_LONG=32"
+	fi
+
+	local uppercase_arch=$(echo "$arch" | tr '[:lower:]' '[:upper:]')
+
+	gcc ${TEMP}/list-syscalls.c -U__LP64__ -U__ILP32__ -U__i386__ \
+		-D${uppercase_arch} \
+		-D__${arch}__ ${extraflags} \
+		-I ${LINUX_HEADERS}/usr/include/ \
+		-o ${TEMP}/list-syscalls &>/dev/null
+
+	${TEMP}/list-syscalls > "${TEMP}/${arch}.in.tosort"
+
+	sort -k2,2n "${TEMP}/${arch}.in.tosort" > "${TEMP}/${arch}.in"
+}
+
+generate_list_syscalls_c()
+{
+	(
+		echo
+		echo "
+		#include <stdio.h>
+		#include <asm/unistd.h>
+
+		int main(void)
+		{
+		"
+		for syscall in $(cat ${TEMP}/syscall-names.txt); do
+			echo "
+		#ifdef __NR_$syscall
+			printf(\"$syscall %d\\n\", __NR_$syscall);
+		#endif
+		"
+		done
+		echo " return 0;
+		}"
+	) > ${TEMP}/list-syscalls.c
+}
+
+export_headers()
+{
+	make -s -C ${KERNELSRC} ARCH=${arch} O=${LINUX_HEADERS} \
+		headers_install &>/dev/null
+}
+
+do_all_tables()
+{
+	for archdir in ${KERNELSRC}/arch/*; do
+		arch=$(basename $archdir)
+
+		bits=64
+		extraflags=
+
+		case ${arch} in
+		Kconfig)
+			continue
+			;;
+		um)
+			continue
+			;;
+		esac
+
+		export_headers
+		grab_syscall_names_from_unistd_h
+
+		case ${arch} in
+		arm)
+			bits=32
+			arch=armoabi extraflags= generate_table
+			arch=arm extraflags=-D__ARM_EABI__ generate_table
+			;;
+		loongarch)
+			# 32-bit variant of loongarch may appear
+			arch=loongarch64 extraflags=-D_LOONGARCH_SZLONG=64 generate_table
+			;;
+		mips)
+			arch=mips64 extraflags=-D_MIPS_SIM=_MIPS_SIM_ABI64 generate_table
+			bits=32
+			arch=mipso32 extraflags=-D_MIPS_SIM=_MIPS_SIM_ABI32 generate_table
+			arch=mips64n32 extraflags=-D_MIPS_SIM=_MIPS_SIM_NABI32 generate_table
+			;;
+		powerpc)
+			generate_table
+			arch=powerpc64 generate_table
+			;;
+		riscv)
+			arch=riscv64 extraflags=-D__LP64__ generate_table
+			bits=32
+			arch=riscv32 extraflags=-D__SIZEOF_POINTER__=4 generate_table
+			;;
+		s390)
+			bits=32
+			generate_table
+			bits=64
+			arch=s390x generate_table
+			;;
+		sparc)
+			bits=32
+			extraflags=-D__32bit_syscall_numbers__ generate_table
+			bits=64
+			arch=sparc64 extraflags=-D__arch64__ generate_table
+			;;
+		x86)
+			arch=x86_64 extraflags=-D__LP64__ generate_table
+			bits=32
+			arch=i386 generate_table
+			arch=x32 extraflags=-D__ILP32__ generate_table
+			;;
+		arc | csky | hexagon | m68k | microblaze | nios2 | openrisc | sh | xtensa)
+			bits=32 generate_table
+			;;
+		*)
+			generate_table
+			;;
+		esac
+	done
+}
+
+copy_supported_arch()
+{
+	while IFS= read -r arch; do
+		if [ -f "${TEMP}/${arch}.in" ]; then
+			echo "- ${arch}"
+			cp "${TEMP}/${arch}.in" "${SCRIPT_DIR}/${arch}.in"
+		fi
+	done < ${SUPPORTED_ARCH}
+}
+
+echo "Temporary directory ${TEMP}"
+echo "Extracting syscalls"
+
+grab_syscall_names_from_tables
+generate_list_syscalls_c
+
+do_all_tables
+
+echo "Copying supported syscalls"
+copy_supported_arch
diff --git a/include/lapi/syscalls/loongarch.in b/include/lapi/syscalls/loongarch64.in
similarity index 100%
rename from include/lapi/syscalls/loongarch.in
rename to include/lapi/syscalls/loongarch64.in
diff --git a/include/lapi/syscalls/mips_n64.in b/include/lapi/syscalls/mips64.in
similarity index 100%
rename from include/lapi/syscalls/mips_n64.in
rename to include/lapi/syscalls/mips64.in
diff --git a/include/lapi/syscalls/mips_n32.in b/include/lapi/syscalls/mips64n32.in
similarity index 100%
rename from include/lapi/syscalls/mips_n32.in
rename to include/lapi/syscalls/mips64n32.in
diff --git a/include/lapi/syscalls/mips_o32.in b/include/lapi/syscalls/mipso32.in
similarity index 100%
rename from include/lapi/syscalls/mips_o32.in
rename to include/lapi/syscalls/mipso32.in
diff --git a/include/lapi/syscalls/hppa.in b/include/lapi/syscalls/parisc.in
similarity index 100%
rename from include/lapi/syscalls/hppa.in
rename to include/lapi/syscalls/parisc.in
diff --git a/include/lapi/syscalls/supported-arch.txt b/include/lapi/syscalls/supported-arch.txt
index c18aa38cf4546cdf3ac8c89a45bd1b202ffa7711..c5c5191ac08482d89f0a8c39dfae936538f58f7f 100644
--- a/include/lapi/syscalls/supported-arch.txt
+++ b/include/lapi/syscalls/supported-arch.txt
@@ -1,13 +1,13 @@
-aarch64
 arc
+arm64
 arm
-hppa
 i386
 ia64
-loongarch
-mips_n32
-mips_n64
-mips_o32
+loongarch64
+mips64n32
+mips64
+mipso32
+parisc
 powerpc64
 powerpc
 s390x

-- 
2.43.0


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