mirror of
https://github.com/ziglang/zig.git
synced 2024-11-30 09:02:32 +00:00
713 lines
23 KiB
Zig
713 lines
23 KiB
Zig
//! To get started, run this tool with no args and read the help message.
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//!
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//! This tool extracts the Linux syscall numbers from the Linux source tree
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//! directly, and emits an enumerated list per supported Zig arch.
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const std = @import("std");
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const mem = std.mem;
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const fmt = std.fmt;
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const zig = std.zig;
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const fs = std.fs;
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const stdlib_renames = std.StaticStringMap([]const u8).initComptime(.{
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// Remove underscore prefix.
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.{ "_llseek", "llseek" },
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.{ "_newselect", "newselect" },
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.{ "_sysctl", "sysctl" },
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// Most 64-bit archs.
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.{ "newfstat", "fstat64" },
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.{ "newfstatat", "fstatat64" },
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// POWER.
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.{ "sync_file_range2", "sync_file_range" },
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// ARM EABI/Thumb.
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.{ "arm_sync_file_range", "sync_file_range" },
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.{ "arm_fadvise64_64", "fadvise64_64" },
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});
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// Only for newer architectures where we use the C preprocessor.
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const stdlib_renames_new = std.StaticStringMap([]const u8).initComptime(.{
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.{ "newuname", "uname" },
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.{ "umount", "umount2" },
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});
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// We use this to deal with the fact that multiple syscalls can be mapped to sys_ni_syscall.
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// Thankfully it's only 2 well-known syscalls in newer kernel ports at the moment.
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fn getOverridenNameNew(value: []const u8) ?[]const u8 {
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if (mem.eql(u8, value, "18")) {
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return "sys_lookup_dcookie";
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} else if (mem.eql(u8, value, "42")) {
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return "sys_nfsservctl";
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} else {
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return null;
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}
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}
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fn isReservedNameOld(name: []const u8) bool {
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return std.mem.startsWith(u8, name, "available") or
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std.mem.startsWith(u8, name, "reserved") or
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std.mem.startsWith(u8, name, "unused");
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}
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const default_args: []const []const u8 = &.{
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"-E",
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// -dM is cleaner, but -dD preserves iteration order.
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"-dD",
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// No need for line-markers.
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"-P",
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"-nostdinc",
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// Using -I=[dir] includes the zig linux headers, which we don't want.
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"-Itools/include",
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"-Itools/include/uapi",
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// Output the syscall in a format we can easily recognize.
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"-D __SYSCALL(nr, nm)=zigsyscall nm nr",
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};
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const ProcessPreprocessedFileFn = *const fn (bytes: []const u8, writer: anytype) anyerror!void;
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const ProcessTableBasedArchFileFn = *const fn (
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bytes: []const u8,
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filters: Filters,
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writer: anytype,
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optional_writer: anytype,
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) anyerror!void;
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const FlowControl = enum {
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@"break",
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@"continue",
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none,
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};
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const AbiCheckParams = struct { abi: []const u8, flow: FlowControl };
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const Filters = struct {
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abiCheckParams: ?AbiCheckParams,
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fixedName: ?*const fn (name: []const u8) []const u8,
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isReservedNameOld: ?*const fn (name: []const u8) bool,
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};
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fn abiCheck(abi: []const u8, params: *const AbiCheckParams) FlowControl {
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if (mem.eql(u8, abi, params.abi)) return params.flow;
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return .none;
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}
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fn fixedName(name: []const u8) []const u8 {
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return if (stdlib_renames.get(name)) |fixed| fixed else name;
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}
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const ArchInfo = union(enum) {
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table: struct {
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name: []const u8,
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enum_name: []const u8,
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file_path: []const u8,
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header: ?[]const u8,
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extra_values: ?[]const u8,
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process_file: ProcessTableBasedArchFileFn,
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filters: Filters,
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additional_enum: ?[]const u8,
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},
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preprocessor: struct {
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name: []const u8,
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enum_name: []const u8,
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file_path: []const u8,
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child_options: struct {
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comptime additional_args: ?[]const []const u8 = null,
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target: []const u8,
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pub inline fn getArgs(self: *const @This(), zig_exe: []const u8, file_path: []const u8) []const []const u8 {
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const additional_args: []const []const u8 = self.additional_args orelse &.{};
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return .{ zig_exe, "cc" } ++ additional_args ++ .{ "-target", self.target } ++ default_args ++ .{file_path};
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}
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},
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header: ?[]const u8,
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extra_values: ?[]const u8,
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process_file: ProcessPreprocessedFileFn,
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additional_enum: ?[]const u8,
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},
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};
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const arch_infos = [_]ArchInfo{
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.{
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// These architectures have their syscall definitions generated from a TSV
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// file, processed via scripts/syscallhdr.sh.
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.table = .{
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.name = "x86",
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.enum_name = "X86",
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.file_path = "arch/x86/entry/syscalls/syscall_32.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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.abiCheckParams = null,
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "x64",
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.enum_name = "X64",
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.file_path = "arch/x86/entry/syscalls/syscall_64.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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// The x32 abi syscalls are always at the end.
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.abiCheckParams = .{ .abi = "x32", .flow = .@"break" },
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "arm",
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.enum_name = "Arm",
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.file_path = "arch/arm/tools/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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.abiCheckParams = .{ .abi = "oabi", .flow = .@"continue" },
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = " const arm_base = 0x0f0000;\n\n",
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// TODO: maybe extract these from arch/arm/include/uapi/asm/unistd.h
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.extra_values =
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\\
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\\ breakpoint = arm_base + 1,
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\\ cacheflush = arm_base + 2,
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\\ usr26 = arm_base + 3,
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\\ usr32 = arm_base + 4,
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\\ set_tls = arm_base + 5,
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\\ get_tls = arm_base + 6,
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\\
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,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "sparc",
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.enum_name = "Sparc",
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.file_path = "arch/sparc/kernel/syscalls/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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.abiCheckParams = .{ .abi = "64", .flow = .@"continue" },
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "sparc64",
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.enum_name = "Sparc64",
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.file_path = "arch/sparc/kernel/syscalls/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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.abiCheckParams = .{ .abi = "32", .flow = .@"continue" },
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "m68k",
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.enum_name = "M68k",
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.file_path = "arch/m68k/kernel/syscalls/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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// abi is always common
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.abiCheckParams = null,
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "mips_o32",
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.enum_name = "MipsO32",
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.file_path = "arch/mips/kernel/syscalls/syscall_o32.tbl",
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.process_file = &processMipsBasedArch,
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.filters = .{
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// abi is always o32
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.abiCheckParams = null,
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.fixedName = &fixedName,
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.isReservedNameOld = &isReservedNameOld,
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},
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.header = " const linux_base = 4000;\n\n",
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "mips_n64",
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.enum_name = "MipsN64",
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.file_path = "arch/mips/kernel/syscalls/syscall_n64.tbl",
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.process_file = &processMipsBasedArch,
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.filters = .{
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// abi is always n64
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.abiCheckParams = null,
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.fixedName = &fixedName,
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.isReservedNameOld = &isReservedNameOld,
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},
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.header = " const linux_base = 5000;\n\n",
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "mips_n32",
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.enum_name = "MipsN32",
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.file_path = "arch/mips/kernel/syscalls/syscall_n32.tbl",
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.process_file = &processMipsBasedArch,
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.filters = .{
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// abi is always n32
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.abiCheckParams = null,
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.fixedName = &fixedName,
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.isReservedNameOld = &isReservedNameOld,
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},
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.header = " const linux_base = 6000;\n\n",
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "powerpc",
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.enum_name = "PowerPC",
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.file_path = "arch/powerpc/kernel/syscalls/syscall.tbl",
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.process_file = &processPowerPcBasedArch,
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.filters = .{
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.abiCheckParams = null,
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.fixedName = null,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = "PowerPC64",
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},
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},
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.{
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.table = .{
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.name = "s390x",
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.enum_name = "S390x",
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.file_path = "arch/s390/kernel/syscalls/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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// 32-bit s390 support in linux is deprecated
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.abiCheckParams = .{ .abi = "32", .flow = .@"continue" },
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.fixedName = &fixedName,
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.isReservedNameOld = null,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.table = .{
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.name = "xtensa",
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.enum_name = "Xtensa",
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.file_path = "arch/xtensa/kernel/syscalls/syscall.tbl",
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.process_file = &processTableBasedArch,
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.filters = .{
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// abi is always common
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.abiCheckParams = null,
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.fixedName = fixedName,
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.isReservedNameOld = &isReservedNameOld,
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},
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "arm64",
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.enum_name = "Arm64",
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.file_path = "arch/arm64/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "aarch64-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "riscv32",
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.enum_name = "RiscV32",
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.file_path = "arch/riscv/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "riscv32-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "riscv64",
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.enum_name = "RiscV64",
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.file_path = "arch/riscv/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "riscv64-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "loongarch",
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.enum_name = "LoongArch64",
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.file_path = "arch/loongarch/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "loongarch64-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "arc",
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.enum_name = "Arc",
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.file_path = "arch/arc/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "arc-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "csky",
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.enum_name = "CSky",
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.file_path = "arch/csky/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "csky-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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.extra_values = null,
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.additional_enum = null,
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},
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},
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.{
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.preprocessor = .{
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.name = "hexagon",
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.enum_name = "Hexagon",
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.file_path = "arch/hexagon/include/uapi/asm/unistd.h",
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.child_options = .{
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.additional_args = null,
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.target = "hexagon-freestanding-none",
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},
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.process_file = &processPreprocessedFile,
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.header = null,
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|
.extra_values = null,
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.additional_enum = null,
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},
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},
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};
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|
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fn processPreprocessedFile(
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bytes: []const u8,
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writer: anytype,
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) !void {
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var lines = mem.tokenizeScalar(u8, bytes, '\n');
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while (lines.next()) |line| {
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var fields = mem.tokenizeAny(u8, line, " ");
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const prefix = fields.next() orelse return error.Incomplete;
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if (!mem.eql(u8, prefix, "zigsyscall")) continue;
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const sys_name = fields.next() orelse return error.Incomplete;
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const value = fields.rest();
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const name = (getOverridenNameNew(value) orelse sys_name)["sys_".len..];
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const fixed_name = if (stdlib_renames_new.get(name)) |f| f else if (stdlib_renames.get(name)) |f| f else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), value });
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}
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}
|
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|
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fn processTableBasedArch(
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bytes: []const u8,
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filters: Filters,
|
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writer: anytype,
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optional_writer: anytype,
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) !void {
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_ = optional_writer;
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|
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var lines = mem.tokenizeScalar(u8, bytes, '\n');
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while (lines.next()) |line| {
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if (line[0] == '#') continue;
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var fields = mem.tokenizeAny(u8, line, " \t");
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const number = fields.next() orelse return error.Incomplete;
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const abi = fields.next() orelse return error.Incomplete;
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if (filters.abiCheckParams) |*params| {
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switch (abiCheck(abi, params)) {
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.none => {},
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.@"break" => break,
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.@"continue" => continue,
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}
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}
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const name = fields.next() orelse return error.Incomplete;
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if (filters.isReservedNameOld) |isReservedNameOldFn| {
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if (isReservedNameOldFn(name)) continue;
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}
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const fixed_name = if (filters.fixedName) |fixedNameFn| fixedNameFn(name) else name;
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|
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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}
|
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}
|
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|
|
fn processMipsBasedArch(
|
|
bytes: []const u8,
|
|
filters: Filters,
|
|
writer: anytype,
|
|
optional_writer: anytype,
|
|
) !void {
|
|
_ = optional_writer;
|
|
|
|
var lines = mem.tokenizeScalar(u8, bytes, '\n');
|
|
while (lines.next()) |line| {
|
|
if (line[0] == '#') continue;
|
|
|
|
var fields = mem.tokenizeAny(u8, line, " \t");
|
|
const number = fields.next() orelse return error.Incomplete;
|
|
|
|
const abi = fields.next() orelse return error.Incomplete;
|
|
if (filters.abiCheckParams) |*params| {
|
|
switch (abiCheck(abi, params)) {
|
|
.none => {},
|
|
.@"break" => break,
|
|
.@"continue" => continue,
|
|
}
|
|
}
|
|
const name = fields.next() orelse return error.Incomplete;
|
|
if (filters.isReservedNameOld) |isReservedNameOldFn| {
|
|
if (isReservedNameOldFn(name)) continue;
|
|
}
|
|
const fixed_name = if (filters.fixedName) |fixedNameFn| fixedNameFn(name) else name;
|
|
|
|
try writer.print(" {p} = linux_base + {s},\n", .{ zig.fmtId(fixed_name), number });
|
|
}
|
|
}
|
|
|
|
fn processPowerPcBasedArch(
|
|
bytes: []const u8,
|
|
filters: Filters,
|
|
writer: anytype,
|
|
optional_writer: anytype,
|
|
) !void {
|
|
_ = filters;
|
|
var lines = mem.tokenizeScalar(u8, bytes, '\n');
|
|
|
|
while (lines.next()) |line| {
|
|
if (line[0] == '#') continue;
|
|
|
|
var fields = mem.tokenizeAny(u8, line, " \t");
|
|
const number = fields.next() orelse return error.Incomplete;
|
|
const abi = fields.next() orelse return error.Incomplete;
|
|
const name = fields.next() orelse return error.Incomplete;
|
|
const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
|
|
|
|
if (mem.eql(u8, abi, "spu")) {
|
|
continue;
|
|
} else if (mem.eql(u8, abi, "32")) {
|
|
try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
|
|
} else if (mem.eql(u8, abi, "64")) {
|
|
try optional_writer.?.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
|
|
} else { // common/nospu
|
|
try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
|
|
try optional_writer.?.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
|
|
}
|
|
}
|
|
}
|
|
|
|
fn generateSyscallsFromTable(
|
|
allocator: std.mem.Allocator,
|
|
buf: []u8,
|
|
linux_dir: std.fs.Dir,
|
|
writer: anytype,
|
|
_arch_info: *const ArchInfo,
|
|
) !void {
|
|
std.debug.assert(_arch_info.* == .table);
|
|
|
|
const arch_info = _arch_info.table;
|
|
|
|
const table = try linux_dir.readFile(arch_info.file_path, buf);
|
|
|
|
var optional_array_list: ?std.ArrayList(u8) = if (arch_info.additional_enum) |_| std.ArrayList(u8).init(allocator) else null;
|
|
const optional_writer = if (optional_array_list) |_| optional_array_list.?.writer() else null;
|
|
|
|
try writer.print("pub const {s} = enum(usize) {{\n", .{arch_info.enum_name});
|
|
|
|
if (arch_info.header) |header| {
|
|
try writer.writeAll(header);
|
|
}
|
|
|
|
try arch_info.process_file(table, arch_info.filters, writer, optional_writer);
|
|
|
|
if (arch_info.extra_values) |extra_values| {
|
|
try writer.writeAll(extra_values);
|
|
}
|
|
try writer.writeAll("};");
|
|
|
|
if (arch_info.additional_enum) |additional_enum| {
|
|
try writer.writeAll("\n\n");
|
|
try writer.print("pub const {s} = enum(usize) {{\n", .{additional_enum});
|
|
try writer.writeAll(optional_array_list.?.items);
|
|
try writer.writeAll("};");
|
|
}
|
|
}
|
|
|
|
fn generateSyscallsFromPreprocessor(
|
|
allocator: std.mem.Allocator,
|
|
linux_dir: std.fs.Dir,
|
|
linux_path: []const u8,
|
|
zig_exe: []const u8,
|
|
writer: anytype,
|
|
_arch_info: *const ArchInfo,
|
|
) !void {
|
|
std.debug.assert(_arch_info.* == .preprocessor);
|
|
|
|
const arch_info = _arch_info.preprocessor;
|
|
|
|
const child_result = try std.process.Child.run(.{
|
|
.allocator = allocator,
|
|
.argv = arch_info.child_options.getArgs(zig_exe, arch_info.file_path),
|
|
.cwd = linux_path,
|
|
.cwd_dir = linux_dir,
|
|
});
|
|
if (child_result.stderr.len > 0) std.debug.print("{s}\n", .{child_result.stderr});
|
|
|
|
const defines = switch (child_result.term) {
|
|
.Exited => |code| if (code == 0) child_result.stdout else {
|
|
std.debug.print("zig cc exited with code {d}\n", .{code});
|
|
std.process.exit(1);
|
|
},
|
|
else => {
|
|
std.debug.print("zig cc crashed\n", .{});
|
|
std.process.exit(1);
|
|
},
|
|
};
|
|
|
|
try writer.print("pub const {s} = enum(usize) {{\n", .{arch_info.enum_name});
|
|
if (arch_info.header) |header| {
|
|
try writer.writeAll(header);
|
|
}
|
|
|
|
try arch_info.process_file(defines, writer);
|
|
|
|
if (arch_info.extra_values) |extra_values| {
|
|
try writer.writeAll(extra_values);
|
|
}
|
|
|
|
try writer.writeAll("};");
|
|
}
|
|
|
|
pub fn main() !void {
|
|
var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
|
|
defer arena.deinit();
|
|
const allocator = arena.allocator();
|
|
|
|
const args = try std.process.argsAlloc(allocator);
|
|
if (args.len < 3 or mem.eql(u8, args[1], "--help"))
|
|
usageAndExit(std.io.getStdErr(), args[0], 1);
|
|
const zig_exe = args[1];
|
|
const linux_path = args[2];
|
|
|
|
var buf_out = std.io.bufferedWriter(std.io.getStdOut().writer());
|
|
const writer = buf_out.writer();
|
|
|
|
var linux_dir = try std.fs.cwd().openDir(linux_path, .{});
|
|
defer linux_dir.close();
|
|
|
|
try writer.writeAll(
|
|
\\// This file is automatically generated.
|
|
\\// See tools/generate_linux_syscalls.zig for more info.
|
|
\\
|
|
\\
|
|
);
|
|
|
|
// As of 5.17.1, the largest table is 23467 bytes.
|
|
// 32k should be enough for now.
|
|
const buf = try allocator.alloc(u8, 1 << 15);
|
|
defer allocator.free(buf);
|
|
|
|
inline for (arch_infos, 0..) |arch_info, i| {
|
|
switch (arch_info) {
|
|
.table => try generateSyscallsFromTable(
|
|
allocator,
|
|
buf,
|
|
linux_dir,
|
|
writer,
|
|
&arch_info,
|
|
),
|
|
.preprocessor => try generateSyscallsFromPreprocessor(
|
|
allocator,
|
|
linux_dir,
|
|
linux_path,
|
|
zig_exe,
|
|
writer,
|
|
&arch_info,
|
|
),
|
|
}
|
|
if (i < arch_infos.len - 1) {
|
|
try writer.writeAll("\n\n");
|
|
} else {
|
|
try writer.writeAll("\n");
|
|
}
|
|
}
|
|
|
|
try buf_out.flush();
|
|
}
|
|
|
|
fn usageAndExit(file: fs.File, arg0: []const u8, code: u8) noreturn {
|
|
file.writer().print(
|
|
\\Usage: {s} /path/to/zig /path/to/linux
|
|
\\Alternative Usage: zig run /path/to/git/zig/tools/generate_linux_syscalls.zig -- /path/to/zig /path/to/linux
|
|
\\
|
|
\\Generates the list of Linux syscalls for each supported cpu arch, using the Linux development tree.
|
|
\\Prints to stdout Zig code which you can use to replace the file lib/std/os/linux/syscalls.zig.
|
|
\\
|
|
, .{arg0}) catch std.process.exit(1);
|
|
std.process.exit(code);
|
|
}
|