Refactor regen.sh script to generate syscalls

Rename regen.sh into a more meaningful generate_syscalls.sh name, rename
order into a more meaningful supported-syscalls.txt name and rewrite
part of the regen.sh script code in order to execute it from anywhere in
the filesystem, without need to be in its own folder. The new code is
also more clear and concise, using native sh features which are
simplifying the code. Architecture *.in files have been renamed to
follow the new supported-syscalls.txt naming convention.

Reviewed-by: Li Wang <[email protected]>
Reviewed-by: Petr Vorel <[email protected]>
Reviewed-by: Cyril Hrubis <[email protected]>
Signed-off-by: Andrea Cervesato <[email protected]>

configure.ac

@@ -386,7 +386,7 @@ else
     AC_SUBST([WITH_REALTIME_TESTSUITE],["no"])
 fi
 
-AC_CONFIG_COMMANDS([syscalls.h], [cd ${ac_top_srcdir}/include/lapi/syscalls; ./regen.sh; cd - >/dev/null])
+AC_CONFIG_COMMANDS([syscalls.h], [cd ${ac_top_srcdir}/include/lapi/syscalls; ./generate_syscalls.sh ../syscalls.h; cd - >/dev/null])
 
 # custom functions
 # NOTE: don't create custom functions for simple checks, put them into this file

include/lapi/syscalls/generate_syscalls.sh

@@ -0,0 +1,109 @@
+#!/bin/sh -eu
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Generate the syscalls.h file, merging all architectures syscalls input file
+# which are in the current folder and defined inside supported-arch.txt file.
+
+SYSCALLS_FILE="$1"
+
+if [ -z "${SYSCALLS_FILE}" ]; then
+	echo "Please provide the syscalls.h directory:"
+	echo ""
+	echo "$0 path/of/syscalls.h"
+	echo ""
+	exit 1
+fi
+
+SCRIPT_DIR="$(realpath $(dirname "$0"))"
+SUPPORTED_ARCH="${SCRIPT_DIR}/supported-arch.txt"
+
+echo '// SPDX-License-Identifier: GPL-2.0-or-later
+/************************************************
+ * GENERATED FILE: DO NOT EDIT/PATCH THIS FILE  *
+ *  change your arch specific .in file instead  *
+ ************************************************/
+
+/*
+ * Here we stick all the ugly *fallback* logic for linux
+ * system call numbers (those __NR_ thingies).
+ */
+
+#ifndef LAPI_SYSCALLS_H__
+#define LAPI_SYSCALLS_H__
+
+#include <errno.h>
+#include <sys/syscall.h>
+#include <asm/unistd.h>
+
+#ifdef TST_TEST_H__
+#define TST_SYSCALL_BRK__(NR, SNR) ({ \
+tst_brk(TCONF, \
+	"syscall(%d) " SNR " not supported on your arch", NR); \
+})
+#else
+inline static void dummy_cleanup(void) {}
+
+#define TST_SYSCALL_BRK__(NR, SNR) ({ \
+tst_brkm(TCONF, dummy_cleanup, \
+	"syscall(%d) " SNR " not supported on your arch", NR); \
+})
+#endif
+
+#define tst_syscall(NR, ...) ({ \
+intptr_t tst_ret; \
+if (NR == __LTP__NR_INVALID_SYSCALL) { \
+	errno = ENOSYS; \
+	tst_ret = -1; \
+} else { \
+	tst_ret = syscall(NR, ##__VA_ARGS__); \
+} \
+if (tst_ret == -1 && errno == ENOSYS) { \
+	TST_SYSCALL_BRK__(NR, #NR); \
+} \
+tst_ret; \
+})
+
+#define __LTP__NR_INVALID_SYSCALL -1' >${SYSCALLS_FILE}
+
+while IFS= read -r arch; do
+	(
+		echo
+		case ${arch} in
+		sparc64) echo "#if defined(__sparc__) && defined(__arch64__)" ;;
+		sparc) echo "#if defined(__sparc__) && !defined(__arch64__)" ;;
+		s390) echo "#if defined(__s390__) && !defined(__s390x__)" ;;
+		mips64n32) echo "#if defined(__mips__) && defined(_ABIN32)" ;;
+		mips64) echo "#if defined(__mips__) && defined(_ABI64)" ;;
+		mipso32) echo "#if defined(__mips__) && defined(_ABIO32) && _MIPS_SZLONG == 32" ;;
+		parisc) echo "#ifdef __hppa__" ;;
+		loongarch64) echo "#ifdef __loongarch__" ;;
+		arm64) echo "#ifdef __aarch64__" ;;
+		*) echo "#ifdef __${arch}__" ;;
+		esac
+
+		while read -r line; do
+			set -- ${line}
+			syscall_nr="__NR_$1"
+			shift
+
+			echo "# ifndef ${syscall_nr}"
+			echo "#  define ${syscall_nr} $*"
+			echo "# endif"
+		done <"${SCRIPT_DIR}/${arch}.in"
+		echo "#endif"
+		echo
+	) >>${SYSCALLS_FILE}
+done <${SUPPORTED_ARCH}
+
+(
+	echo
+	echo "/* Common stubs */"
+	for num in $(awk '{print $1}' "${SCRIPT_DIR}/"*.in | sort -u); do
+		syscall_nr="__NR_${num}"
+
+		echo "# ifndef ${syscall_nr}"
+		echo "#  define ${syscall_nr} __LTP__NR_INVALID_SYSCALL"
+		echo "# endif"
+	done
+	echo "#endif"
+) >>${SYSCALLS_FILE}

include/lapi/syscalls/order → 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