From 74ea3c42bef943da263395d19c50ad4dba605b9f Mon Sep 17 00:00:00 2001
From: Dmitry Selyutin <ghostmansd@gmail.com>
Date: Sun, 17 Sep 2023 20:49:47 +0300
Subject: [PATCH] syscalls/lscmg: introduce Linux syscalls mapping generator

---
 src/openpower/syscalls/lscmg.py | 88 +++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/openpower/syscalls/lscmg.py

diff --git a/src/openpower/syscalls/lscmg.py b/src/openpower/syscalls/lscmg.py
new file mode 100644
index 00000000..d5c69872
--- /dev/null
+++ b/src/openpower/syscalls/lscmg.py
@@ -0,0 +1,88 @@
+import argparse
+import collections
+import enum
+import functools
+import json
+import os
+import pathlib
+import re
+
+
+def collect_sysnums(tree):
+    def parse(path):
+        table = collections.defaultdict(dict)
+        whitespace = re.compile(r"\s+")
+        with open(path, mode="r", encoding="UTF-8") as stream:
+            lines = filter(lambda line: not line.strip().startswith("#"), stream)
+            for line in filter(bool, map(str.strip, lines)):
+                (number, abi, name, *entries) = map(str.strip, whitespace.split(line))
+                entries = tuple(entries)
+                if len(entries) > 2:
+                    raise ValueError(line)
+                table[abi][number] = (name, entries)
+                table[abi][name] = number
+
+        return table
+
+    tables = (
+        ("alpha", "arch/alpha/kernel/syscalls/syscall.tbl"),
+        ("arm", "arch/arm/tools/syscall.tbl"),
+        ("ia64", "arch/ia64/kernel/syscalls/syscall.tbl"),
+        ("m68k", "arch/m68k/kernel/syscalls/syscall.tbl"),
+        ("microblaze", "arch/microblaze/kernel/syscalls/syscall.tbl"),
+        ("mips-n32", "arch/mips/kernel/syscalls/syscall_n32.tbl"),
+        ("mips-n64", "arch/mips/kernel/syscalls/syscall_n64.tbl"),
+        ("mips-o32", "arch/mips/kernel/syscalls/syscall_o32.tbl"),
+        ("parisc", "arch/parisc/kernel/syscalls/syscall.tbl"),
+        ("ppc", "arch/powerpc/kernel/syscalls/syscall.tbl"),
+        ("s390", "arch/s390/kernel/syscalls/syscall.tbl"),
+        ("sh", "arch/sh/kernel/syscalls/syscall.tbl"),
+        ("sparc", "arch/sparc/kernel/syscalls/syscall.tbl"),
+        ("x86-32", "arch/x86/entry/syscalls/syscall_32.tbl"),
+        ("x86-64", "arch/x86/entry/syscalls/syscall_64.tbl"),
+        ("xtensa", "arch/xtensa/kernel/syscalls/syscall.tbl"),
+    )
+    for (arch, path) in tables:
+        yield (arch, parse(path=(tree / path)))
+
+
+def collect_sysargs(tree):
+    pattern = re.compile(r"(COMPAT_)?SYSCALL_DEFINE[0-7]\((.*?)\)", re.S | re.M)
+    compat_arg_u64_pattern = re.compile(r"compat_arg_u64_dual\((.+?)\)")
+
+    for (root, _, paths) in os.walk(top=tree):
+        root = pathlib.Path(root)
+        paths = map(lambda path: (root / path), paths)
+        for path in filter(lambda path: path.suffix == ".c", paths):
+            with open(path, mode="r", encoding="UTF-8") as stream:
+                code = stream.read()
+                code = compat_arg_u64_pattern.sub(r"u32, \1_a, u32, \1_b", code)
+                for match in pattern.finditer(code):
+                    compat = (match.group(1) is not None)
+                    match = match.group(2).replace("\t", "").replace("\n", "")
+                    (name, *arguments) = map(str.strip, match.split(","))
+                    if compat:
+                        name = f"compat_{name}"
+                    yield (name, dict(zip(arguments[1::2], arguments[0::2])))
+
+
+def main():
+    parser = argparse.ArgumentParser("lscmg",
+        description="Linux system calls mapping generator")
+    parser.add_argument("tree",
+        help="path to kernel source tree",
+        type=pathlib.Path)
+
+    arguments = dict(vars(parser.parse_args()))
+
+    tree = arguments.pop("tree")
+    tree = tree.expanduser()
+    sysnums = dict(collect_sysnums(tree=tree))
+    sysargs = dict(collect_sysargs(tree=tree))
+
+    print("SYSNUMS", "=", json.dumps(sysnums, indent=4))
+    print("SYSARGS", "=", json.dumps(sysargs, indent=4))
+
+
+if __name__ == "__main__":
+    main()
-- 
2.30.2