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generate_linux_syscalls: Rework generation strategy for newer kernel ports.
If we're going to abuse the preprocessor, we may as well go all the way and have it generate a convenient format for us. This achieves two things: 1. We no longer need hacks for the arch-specific syscalls. 2. We now generate the correct syscall names for 32-bit platforms. The latter is because we now resolve __SC_3264, etc.
This commit is contained in:
Alex Rønne Petersen
parent
f494a47ca5
commit
7e74276661
1 changed files with 69 additions and 75 deletions
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@ -10,7 +10,12 @@ 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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@ -19,6 +24,24 @@ const stdlib_renames = std.StaticStringMap([]const u8).initComptime(.{
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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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pub fn main() !void {
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var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
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defer arena.deinit();
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@ -60,8 +83,9 @@ pub fn main() !void {
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// abi is always i386
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_ = fields.next() orelse return error.Incomplete;
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const name = fields.next() orelse return error.Incomplete;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(name), number });
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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}
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try writer.writeAll("};\n\n");
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@ -80,8 +104,8 @@ pub fn main() !void {
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// The x32 abi syscalls are always at the end.
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if (mem.eql(u8, abi, "x32")) break;
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const name = fields.next() orelse return error.Incomplete;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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}
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@ -105,8 +129,8 @@ pub fn main() !void {
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const abi = fields.next() orelse return error.Incomplete;
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if (mem.eql(u8, abi, "oabi")) continue;
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const name = fields.next() orelse return error.Incomplete;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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}
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@ -136,8 +160,9 @@ pub fn main() !void {
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const abi = fields.next() orelse return error.Incomplete;
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if (mem.eql(u8, abi, "32")) continue;
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const name = fields.next() orelse return error.Incomplete;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(name), number });
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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}
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try writer.writeAll("};\n\n");
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@ -161,8 +186,9 @@ pub fn main() !void {
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_ = fields.next() orelse return error.Incomplete;
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const name = fields.next() orelse return error.Incomplete;
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if (mem.startsWith(u8, name, "unused")) continue;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = Linux + {s},\n", .{ zig.fmtId(name), number });
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try writer.print(" {p} = Linux + {s},\n", .{ zig.fmtId(fixed_name), number });
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}
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try writer.writeAll("};\n\n");
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@ -232,11 +258,6 @@ pub fn main() !void {
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// Newer architectures (starting with aarch64 c. 2012) now use the same C
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// header file for their syscall numbers. Arch-specific headers are used to
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// define pre-proc. vars that add additional (usually obsolete) syscalls.
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//
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// TODO:
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// - It would be better to use libclang/translate-c directly to extract the definitions.
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// - The `-dD` option only does minimal pre-processing and doesn't resolve addition,
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// so arch specific syscalls are dealt with manually.
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{
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try writer.writeAll("pub const Arm64 = enum(usize) {\n");
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@ -254,6 +275,8 @@ pub fn main() !void {
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// Using -I=[dir] includes the zig linux headers, which we don't want.
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"-Iinclude",
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"-Iinclude/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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"arch/arm64/include/uapi/asm/unistd.h",
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};
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@ -277,32 +300,24 @@ pub fn main() !void {
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};
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var lines = mem.tokenizeScalar(u8, defines, '\n');
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loop: while (lines.next()) |line| {
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var fields = mem.tokenizeAny(u8, line, " \t");
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const cmd = fields.next() orelse return error.Incomplete;
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if (!mem.eql(u8, cmd, "#define")) continue;
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const define = fields.next() orelse return error.Incomplete;
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const number = fields.next() orelse continue;
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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 (!std.ascii.isDigit(number[0])) continue;
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if (!mem.startsWith(u8, define, "__NR")) continue;
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const name = mem.trimLeft(u8, mem.trimLeft(u8, define, "__NR3264_"), "__NR_");
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if (mem.eql(u8, name, "arch_specific_syscall")) continue;
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if (mem.eql(u8, name, "syscalls")) break :loop;
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if (!mem.eql(u8, prefix, "zigsyscall")) continue;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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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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try writer.writeAll("};\n\n");
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}
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{
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try writer.writeAll(
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\\pub const RiscV32 = enum(usize) {
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\\ pub const arch_specific_syscall = 244;
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\\
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\\
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);
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try writer.writeAll("pub const RiscV32 = enum(usize) {\n");
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const child_args = [_][]const u8{
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zig_exe,
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@ -316,6 +331,7 @@ pub fn main() !void {
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"-Iinclude",
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"-Iinclude/uapi",
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"-Iarch/riscv/include/uapi",
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"-D __SYSCALL(nr, nm)=zigsyscall nm nr",
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"arch/riscv/include/uapi/asm/unistd.h",
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};
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@ -339,38 +355,24 @@ pub fn main() !void {
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};
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var lines = mem.tokenizeScalar(u8, defines, '\n');
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loop: while (lines.next()) |line| {
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var fields = mem.tokenizeAny(u8, line, " \t");
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const cmd = fields.next() orelse return error.Incomplete;
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if (!mem.eql(u8, cmd, "#define")) continue;
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const define = fields.next() orelse return error.Incomplete;
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const number = fields.next() orelse continue;
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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 (!std.ascii.isDigit(number[0])) continue;
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if (!mem.startsWith(u8, define, "__NR")) continue;
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const name = mem.trimLeft(u8, mem.trimLeft(u8, define, "__NR3264_"), "__NR_");
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if (mem.eql(u8, name, "arch_specific_syscall")) continue;
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if (mem.eql(u8, name, "syscalls")) break :loop;
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if (!mem.eql(u8, prefix, "zigsyscall")) continue;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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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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try writer.writeAll(
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\\
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\\ riscv_flush_icache = arch_specific_syscall + 15,
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\\ riscv_hwprobe = arch_specific_syscall + 14,
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\\};
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\\
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);
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try writer.writeAll("};\n\n");
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}
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{
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try writer.writeAll(
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\\pub const RiscV64 = enum(usize) {
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\\ pub const arch_specific_syscall = 244;
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\\
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\\
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);
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try writer.writeAll("pub const RiscV64 = enum(usize) {\n");
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const child_args = [_][]const u8{
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zig_exe,
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@ -384,6 +386,7 @@ pub fn main() !void {
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"-Iinclude",
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"-Iinclude/uapi",
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"-Iarch/riscv/include/uapi",
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"-D __SYSCALL(nr, nm)=zigsyscall nm nr",
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"arch/riscv/include/uapi/asm/unistd.h",
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};
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@ -407,30 +410,21 @@ pub fn main() !void {
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};
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var lines = mem.tokenizeScalar(u8, defines, '\n');
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loop: while (lines.next()) |line| {
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var fields = mem.tokenizeAny(u8, line, " \t");
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const cmd = fields.next() orelse return error.Incomplete;
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if (!mem.eql(u8, cmd, "#define")) continue;
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const define = fields.next() orelse return error.Incomplete;
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const number = fields.next() orelse continue;
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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 (!std.ascii.isDigit(number[0])) continue;
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if (!mem.startsWith(u8, define, "__NR")) continue;
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const name = mem.trimLeft(u8, mem.trimLeft(u8, define, "__NR3264_"), "__NR_");
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if (mem.eql(u8, name, "arch_specific_syscall")) continue;
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if (mem.eql(u8, name, "syscalls")) break :loop;
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if (!mem.eql(u8, prefix, "zigsyscall")) continue;
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const fixed_name = if (stdlib_renames.get(name)) |fixed| fixed else name;
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try writer.print(" {p} = {s},\n", .{ zig.fmtId(fixed_name), number });
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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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try writer.writeAll(
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\\
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\\ riscv_flush_icache = arch_specific_syscall + 15,
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\\ riscv_hwprobe = arch_specific_syscall + 14,
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\\};
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\\
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);
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try writer.writeAll("};\n\n");
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}
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{
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try writer.writeAll(
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