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tools/gen_stubs: add aarch64 and output preprocessor directives
Now it outputs libc.S which can be assembled with zig, and the small differences per-architecture are handled with preprocessor directives. There is also now a set of blacklisted symbols which contains compiler-rt.
This commit is contained in:
Andrew Kelley
parent
04d44db6cc
commit
da9542c0af
1 changed files with 510 additions and 63 deletions
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@ -1,15 +1,25 @@
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//! Example usage:
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//! ./gen_stubs /path/to/musl/build-all
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//! ./gen_stubs /path/to/musl/build-all >libc.S
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//!
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//! The directory 'build-all' is expected to contain these subdirectories:
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//! arm i386 mips mips64 powerpc powerpc64 riscv64 x86_64
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//!
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//! ...each with 'lib/libc.so' inside of them.
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//!
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//! When building the resulting libc.S file, these defines are required:
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//! * `-DPTR64`: when the architecture is 64-bit
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//! * One of the following, corresponding to the CPU architecture:
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//! - `-DARCH_riscv64`
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//! - `-DARCH_mips`
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//! - `-DARCH_i386`
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//! - `-DARCH_x86_64`
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//! - `-DARCH_powerpc`
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//! - `-DARCH_powerpc64`
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//! - `-DARCH_aarch64`
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// TODO: pick the best index to put them into instead of at the end
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// - e.g. find a common previous symbol and put it after that one
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// - they definitely need to go into the correct section
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// TODO: emit MultiSyms to use the preprocessor
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const std = @import("std");
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const builtin = std.builtin;
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@ -18,9 +28,9 @@ const log = std.log;
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const elf = std.elf;
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const native_endian = @import("builtin").target.cpu.arch.endian();
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const arches: [6]std.Target.Cpu.Arch = blk: {
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var result: [6]std.Target.Cpu.Arch = undefined;
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for (.{ .riscv64, .mips, .i386, .x86_64, .powerpc, .powerpc64 }) |arch| {
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const arches: [7]std.Target.Cpu.Arch = blk: {
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var result: [7]std.Target.Cpu.Arch = undefined;
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for (.{ .riscv64, .mips, .i386, .x86_64, .powerpc, .powerpc64, .aarch64 }) |arch| {
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result[archIndex(arch)] = arch;
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}
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break :blk result;
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@ -29,16 +39,129 @@ const arches: [6]std.Target.Cpu.Arch = blk: {
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const MultiSym = struct {
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size: [arches.len]u64,
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present: [arches.len]bool,
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binding: [arches.len]u4,
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section: u16,
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ty: u4,
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binding: u4,
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visib: elf.STV,
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fn allPresent(ms: MultiSym) bool {
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for (arches) |_, i| {
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if (!ms.present[i]) {
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return false;
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}
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}
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return true;
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}
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fn is32Only(ms: MultiSym) bool {
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return ms.present[archIndex(.riscv64)] == false and
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ms.present[archIndex(.mips)] == true and
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ms.present[archIndex(.i386)] == true and
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ms.present[archIndex(.x86_64)] == false and
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ms.present[archIndex(.powerpc)] == true and
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ms.present[archIndex(.powerpc64)] == false and
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ms.present[archIndex(.aarch64)] == false;
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}
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fn commonSize(ms: MultiSym) ?u64 {
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var size: ?u64 = null;
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for (arches) |_, i| {
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if (!ms.present[i]) continue;
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if (size) |s| {
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if (ms.size[i] != s) {
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return null;
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}
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} else {
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size = ms.size[i];
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}
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}
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return size.?;
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}
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fn commonBinding(ms: MultiSym) ?u4 {
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var binding: ?u4 = null;
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for (arches) |_, i| {
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if (!ms.present[i]) continue;
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if (binding) |b| {
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if (ms.binding[i] != b) {
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return null;
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}
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} else {
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binding = ms.binding[i];
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}
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}
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return binding.?;
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}
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fn isPtrSize(ms: MultiSym) bool {
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const map = .{
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.{ .riscv64, 8 },
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.{ .mips, 4 },
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.{ .i386, 4 },
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.{ .x86_64, 8 },
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.{ .powerpc, 4 },
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.{ .powerpc64, 8 },
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.{ .aarch64, 8 },
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};
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inline for (map) |item| {
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const arch = item[0];
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const size = item[1];
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const arch_index = archIndex(arch);
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if (ms.present[arch_index] and ms.size[arch_index] != size) {
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return false;
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}
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}
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return true;
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}
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fn isPtr2Size(ms: MultiSym) bool {
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const map = .{
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.{ .riscv64, 16 },
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.{ .mips, 8 },
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.{ .i386, 8 },
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.{ .x86_64, 16 },
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.{ .powerpc, 8 },
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.{ .powerpc64, 16 },
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.{ .aarch64, 16 },
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};
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inline for (map) |item| {
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const arch = item[0];
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const size = item[1];
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const arch_index = archIndex(arch);
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if (ms.present[arch_index] and ms.size[arch_index] != size) {
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return false;
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}
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}
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return true;
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}
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fn isWeak64(ms: MultiSym) bool {
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const map = .{
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.{ .riscv64, 2 },
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.{ .mips, 1 },
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.{ .i386, 1 },
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.{ .x86_64, 2 },
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.{ .powerpc, 1 },
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.{ .powerpc64, 2 },
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.{ .aarch64, 2 },
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};
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inline for (map) |item| {
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const arch = item[0];
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const binding = item[1];
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const arch_index = archIndex(arch);
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if (ms.present[arch_index] and ms.binding[arch_index] != binding) {
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return false;
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}
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}
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return true;
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}
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};
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const Parse = struct {
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arena: mem.Allocator,
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sym_table: *std.StringArrayHashMap(MultiSym),
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sections: *std.StringArrayHashMap(void),
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blacklist: std.StringArrayHashMap(void),
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elf_bytes: []align(@alignOf(elf.Elf64_Ehdr)) u8,
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header: elf.Header,
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arch: std.Target.Cpu.Arch,
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@ -54,6 +177,15 @@ pub fn main() !void {
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var build_all_dir = try std.fs.cwd().openDir(build_all_path, .{});
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var sym_table = std.StringArrayHashMap(MultiSym).init(arena);
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var sections = std.StringArrayHashMap(void).init(arena);
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var blacklist = std.StringArrayHashMap(void).init(arena);
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try blacklist.ensureUnusedCapacity(blacklisted_symbols.len);
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for (blacklisted_symbols) |name| {
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blacklist.putAssumeCapacityNoClobber(name, {});
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}
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for (arches) |arch| {
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const libc_so_path = try std.fmt.allocPrint(arena, "{s}/lib/libc.so", .{@tagName(arch)});
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@ -68,13 +200,11 @@ pub fn main() !void {
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);
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const header = try elf.Header.parse(elf_bytes[0..@sizeOf(elf.Elf64_Ehdr)]);
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var sym_table = std.StringArrayHashMap(MultiSym).init(arena);
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var sections = std.StringArrayHashMap(void).init(arena);
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const parse: Parse = .{
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.arena = arena,
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.sym_table = &sym_table,
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.sections = §ions,
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.blacklist = blacklist,
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.elf_bytes = elf_bytes,
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.header = header,
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.arch = arch,
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@ -93,50 +223,132 @@ pub fn main() !void {
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}
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const stdout = std.io.getStdOut().writer();
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_ = stdout;
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try stdout.writeAll(
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\\#ifdef PTR64
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\\#define WEAK64 .weak
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\\#define PTR_SIZE_BYTES 8
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\\#define PTR2_SIZE_BYTES 16
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\\#else
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\\#define WEAK64 .globl
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\\#define PTR_SIZE_BYTES 4
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\\#define PTR2_SIZE_BYTES 8
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\\#endif
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\\
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);
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//var prev_section: u16 = 0;
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//for (all_syms) |sym| {
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// const this_section = s(sym.st_shndx);
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// if (this_section != prev_section) {
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// prev_section = this_section;
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// const sh_name = mem.sliceTo(shstrtab[s(shdrs[this_section].sh_name)..], 0);
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// try stdout.print("{s}\n", .{sh_name});
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// }
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var prev_section: u16 = std.math.maxInt(u16);
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var prev_pp_state: enum { none, ptr32, special } = .none;
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for (sym_table.values()) |multi_sym, sym_index| {
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const name = sym_table.keys()[sym_index];
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// switch (binding) {
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// elf.STB_GLOBAL => {
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// try stdout.print(".globl {s}\n", .{name});
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// },
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// elf.STB_WEAK => {
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// try stdout.print(".weak {s}\n", .{name});
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// },
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// else => unreachable,
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// }
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if (multi_sym.section != prev_section) {
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prev_section = multi_sym.section;
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const sh_name = sections.keys()[multi_sym.section];
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try stdout.print("{s}\n", .{sh_name});
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}
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// switch (ty) {
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// elf.STT_NOTYPE => {},
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// elf.STT_FUNC => {
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// try stdout.print(".type {s}, %function;\n", .{name});
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// // omitting the size is OK for functions
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// },
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// elf.STT_OBJECT => {
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// try stdout.print(".type {s}, %object;\n", .{name});
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// if (size != 0) {
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// try stdout.print(".size {s}, {d}\n", .{ name, size });
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// }
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// },
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// else => unreachable,
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// }
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if (multi_sym.allPresent()) {
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switch (prev_pp_state) {
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.none => {},
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.ptr32, .special => {
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try stdout.writeAll("#endif\n");
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prev_pp_state = .none;
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},
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}
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} else if (multi_sym.is32Only()) {
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switch (prev_pp_state) {
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.none => {
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try stdout.writeAll("#ifdef PTR32\n");
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prev_pp_state = .ptr32;
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},
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.special => {
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try stdout.writeAll("#endif\n#ifdef PTR32\n");
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prev_pp_state = .ptr32;
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},
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.ptr32 => {},
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}
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} else {
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switch (prev_pp_state) {
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.none => {},
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.special, .ptr32 => {
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try stdout.writeAll("#endif\n");
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},
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}
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prev_pp_state = .special;
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// switch (visib) {
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// .DEFAULT => {},
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// .PROTECTED => try stdout.print(".protected {s}\n", .{name}),
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// .INTERNAL, .HIDDEN => unreachable,
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// }
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var first = true;
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try stdout.writeAll("#if ");
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// try stdout.print("{s}:\n", .{name});
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//}
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for (arches) |arch, i| {
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if (multi_sym.present[i]) continue;
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if (!first) try stdout.writeAll(" && ");
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first = false;
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try stdout.print("!defined(ARCH_{s})", .{@tagName(arch)});
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}
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try stdout.writeAll("\n");
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}
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if (multi_sym.commonBinding()) |binding| {
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switch (binding) {
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elf.STB_GLOBAL => {
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try stdout.print(".globl {s}\n", .{name});
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},
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elf.STB_WEAK => {
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try stdout.print(".weak {s}\n", .{name});
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},
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else => unreachable,
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}
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} else if (multi_sym.isWeak64()) {
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try stdout.print("WEAK64 {s}\n", .{name});
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} else {
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for (arches) |arch, i| {
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log.info("symbol '{s}' binding on {s}: {d}", .{
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name, @tagName(arch), multi_sym.binding[i],
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});
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}
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}
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switch (multi_sym.ty) {
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elf.STT_NOTYPE => {},
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elf.STT_FUNC => {
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try stdout.print(".type {s}, %function;\n", .{name});
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// omitting the size is OK for functions
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},
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elf.STT_OBJECT => {
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try stdout.print(".type {s}, %object;\n", .{name});
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if (multi_sym.commonSize()) |size| {
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try stdout.print(".size {s}, {d}\n", .{ name, size });
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} else if (multi_sym.isPtrSize()) {
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try stdout.print(".size {s}, PTR_SIZE_BYTES\n", .{name});
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} else if (multi_sym.isPtr2Size()) {
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try stdout.print(".size {s}, PTR2_SIZE_BYTES\n", .{name});
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} else {
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for (arches) |arch, i| {
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log.info("symbol '{s}' size on {s}: {d}", .{
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name, @tagName(arch), multi_sym.size[i],
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});
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}
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//try stdout.print(".size {s}, {d}\n", .{ name, size });
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}
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},
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else => unreachable,
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}
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switch (multi_sym.visib) {
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.DEFAULT => {},
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.PROTECTED => try stdout.print(".protected {s}\n", .{name}),
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.INTERNAL, .HIDDEN => unreachable,
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}
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try stdout.print("{s}:\n", .{name});
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}
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switch (prev_pp_state) {
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.none => {},
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.ptr32, .special => try stdout.writeAll("#endif\n"),
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}
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}
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fn parseElf(parse: Parse, comptime is_64: bool, comptime endian: builtin.Endian) !void {
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@ -205,9 +417,10 @@ fn parseElf(parse: Parse, comptime is_64: bool, comptime endian: builtin.Endian)
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const visib = @intToEnum(elf.STV, @truncate(u2, sym.st_other));
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const size = s(sym.st_size);
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if (parse.blacklist.contains(name)) continue;
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if (size == 0) {
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log.warn("{s}: symbol '{s}' has size 0", .{ @tagName(parse.arch), name });
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continue;
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}
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switch (binding) {
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@ -245,26 +458,50 @@ fn parseElf(parse: Parse, comptime is_64: bool, comptime endian: builtin.Endian)
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if (gop.value_ptr.section != section_index_map[this_section]) {
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const sh_name = mem.sliceTo(shstrtab[s(shdrs[this_section].sh_name)..], 0);
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fatal("symbol '{s}' in arch {s} is in section {s} but in arch {s} is in section {s}", .{
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name, @tagName(parse.arch), sh_name,
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archSetName(gop.value_ptr.present), parse.sections.keys()[gop.value_ptr.section],
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name,
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@tagName(parse.arch),
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sh_name,
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archSetName(gop.value_ptr.present),
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parse.sections.keys()[gop.value_ptr.section],
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});
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}
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if (gop.value_ptr.ty != ty) {
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if (gop.value_ptr.ty != ty) blk: {
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if (ty == elf.STT_NOTYPE) {
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log.warn("symbol '{s}' in arch {s} has type {d} but in arch {s} has type {d}. going with the one that is not STT_NOTYPE", .{
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name,
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@tagName(parse.arch),
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ty,
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archSetName(gop.value_ptr.present),
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gop.value_ptr.ty,
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});
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break :blk;
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}
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if (gop.value_ptr.ty == elf.STT_NOTYPE) {
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log.warn("symbol '{s}' in arch {s} has type {d} but in arch {s} has type {d}. going with the one that is not STT_NOTYPE", .{
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name,
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@tagName(parse.arch),
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ty,
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archSetName(gop.value_ptr.present),
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gop.value_ptr.ty,
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});
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gop.value_ptr.ty = ty;
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break :blk;
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}
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fatal("symbol '{s}' in arch {s} has type {d} but in arch {s} has type {d}", .{
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name, @tagName(parse.arch), ty,
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archSetName(gop.value_ptr.present), gop.value_ptr.ty,
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});
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}
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if (gop.value_ptr.binding != binding) {
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fatal("symbol '{s}' in arch {s} has binding {d} but in arch {s} has binding {d}", .{
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name, @tagName(parse.arch), binding,
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archSetName(gop.value_ptr.present), gop.value_ptr.binding,
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name,
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@tagName(parse.arch),
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ty,
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archSetName(gop.value_ptr.present),
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gop.value_ptr.ty,
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});
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}
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if (gop.value_ptr.visib != visib) {
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fatal("symbol '{s}' in arch {s} has visib {s} but in arch {s} has visib {s}", .{
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name, @tagName(parse.arch), @tagName(visib),
|
||||
archSetName(gop.value_ptr.present), @tagName(gop.value_ptr.visib),
|
||||
name,
|
||||
@tagName(parse.arch),
|
||||
@tagName(visib),
|
||||
archSetName(gop.value_ptr.present),
|
||||
@tagName(gop.value_ptr.visib),
|
||||
});
|
||||
}
|
||||
} else {
|
||||
|
|
@ -272,13 +509,14 @@ fn parseElf(parse: Parse, comptime is_64: bool, comptime endian: builtin.Endian)
|
|||
.present = [1]bool{false} ** arches.len,
|
||||
.section = section_index_map[this_section],
|
||||
.ty = ty,
|
||||
.binding = binding,
|
||||
.binding = [1]u4{0} ** arches.len,
|
||||
.visib = visib,
|
||||
.size = [1]u64{0} ** arches.len,
|
||||
};
|
||||
}
|
||||
gop.value_ptr.present[archIndex(parse.arch)] = true;
|
||||
gop.value_ptr.size[archIndex(parse.arch)] = size;
|
||||
gop.value_ptr.binding[archIndex(parse.arch)] = binding;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -291,6 +529,7 @@ fn archIndex(arch: std.Target.Cpu.Arch) u8 {
|
|||
.x86_64 => 3,
|
||||
.powerpc => 4,
|
||||
.powerpc64 => 5,
|
||||
.aarch64 => 6,
|
||||
else => unreachable,
|
||||
// zig fmt: on
|
||||
};
|
||||
|
|
@ -309,3 +548,211 @@ fn fatal(comptime format: []const u8, args: anytype) noreturn {
|
|||
log.err(format, args);
|
||||
std.process.exit(1);
|
||||
}
|
||||
|
||||
const blacklisted_symbols = [_][]const u8{
|
||||
"__adddf3",
|
||||
"__addkf3",
|
||||
"__addsf3",
|
||||
"__addtf3",
|
||||
"__ashldi3",
|
||||
"__ashlti3",
|
||||
"__ashrdi3",
|
||||
"__ashrti3",
|
||||
"__atomic_compare_exchange",
|
||||
"__atomic_compare_exchange_1",
|
||||
"__atomic_compare_exchange_2",
|
||||
"__atomic_compare_exchange_4",
|
||||
"__atomic_compare_exchange_8",
|
||||
"__atomic_exchange",
|
||||
"__atomic_exchange_1",
|
||||
"__atomic_exchange_2",
|
||||
"__atomic_exchange_4",
|
||||
"__atomic_exchange_8",
|
||||
"__atomic_fetch_add_1",
|
||||
"__atomic_fetch_add_2",
|
||||
"__atomic_fetch_add_4",
|
||||
"__atomic_fetch_add_8",
|
||||
"__atomic_fetch_and_1",
|
||||
"__atomic_fetch_and_2",
|
||||
"__atomic_fetch_and_4",
|
||||
"__atomic_fetch_and_8",
|
||||
"__atomic_fetch_nand_1",
|
||||
"__atomic_fetch_nand_2",
|
||||
"__atomic_fetch_nand_4",
|
||||
"__atomic_fetch_nand_8",
|
||||
"__atomic_fetch_or_1",
|
||||
"__atomic_fetch_or_2",
|
||||
"__atomic_fetch_or_4",
|
||||
"__atomic_fetch_or_8",
|
||||
"__atomic_fetch_sub_1",
|
||||
"__atomic_fetch_sub_2",
|
||||
"__atomic_fetch_sub_4",
|
||||
"__atomic_fetch_sub_8",
|
||||
"__atomic_fetch_xor_1",
|
||||
"__atomic_fetch_xor_2",
|
||||
"__atomic_fetch_xor_4",
|
||||
"__atomic_fetch_xor_8",
|
||||
"__atomic_load",
|
||||
"__atomic_load_1",
|
||||
"__atomic_load_2",
|
||||
"__atomic_load_4",
|
||||
"__atomic_load_8",
|
||||
"__atomic_store",
|
||||
"__atomic_store_1",
|
||||
"__atomic_store_2",
|
||||
"__atomic_store_4",
|
||||
"__atomic_store_8",
|
||||
"__clear_cache",
|
||||
"__clzdi2",
|
||||
"__clzsi2",
|
||||
"__clzti2",
|
||||
"__cmpdf2",
|
||||
"__cmpsf2",
|
||||
"__cmptf2",
|
||||
"__ctzdi2",
|
||||
"__ctzsi2",
|
||||
"__ctzti2",
|
||||
"__divdf3",
|
||||
"__divdi3",
|
||||
"__divkf3",
|
||||
"__divmoddi4",
|
||||
"__divmodsi4",
|
||||
"__divsf3",
|
||||
"__divsi3",
|
||||
"__divtf3",
|
||||
"__divti3",
|
||||
"__dlstart",
|
||||
"__eqdf2",
|
||||
"__eqkf2",
|
||||
"__eqsf2",
|
||||
"__eqtf2",
|
||||
"__extenddfkf2",
|
||||
"__extenddftf2",
|
||||
"__extendhfsf2",
|
||||
"__extendhftf2",
|
||||
"__extendsfdf2",
|
||||
"__extendsfkf2",
|
||||
"__extendsftf2",
|
||||
"__ffsdi2",
|
||||
"__ffssi2",
|
||||
"__ffsti2",
|
||||
"__fixdfdi",
|
||||
"__fixdfsi",
|
||||
"__fixdfti",
|
||||
"__fixkfdi",
|
||||
"__fixkfsi",
|
||||
"__fixsfdi",
|
||||
"__fixsfsi",
|
||||
"__fixsfti",
|
||||
"__fixtfdi",
|
||||
"__fixtfsi",
|
||||
"__fixtfti",
|
||||
"__fixunsdfdi",
|
||||
"__fixunsdfsi",
|
||||
"__fixunsdfti",
|
||||
"__fixunskfdi",
|
||||
"__fixunskfsi",
|
||||
"__fixunssfdi",
|
||||
"__fixunssfsi",
|
||||
"__fixunssfti",
|
||||
"__fixunstfdi",
|
||||
"__fixunstfsi",
|
||||
"__fixunstfti",
|
||||
"__floatdidf",
|
||||
"__floatdikf",
|
||||
"__floatdisf",
|
||||
"__floatditf",
|
||||
"__floatsidf",
|
||||
"__floatsikf",
|
||||
"__floatsisf",
|
||||
"__floatsitf",
|
||||
"__floattidf",
|
||||
"__floattisf",
|
||||
"__floattitf",
|
||||
"__floatundidf",
|
||||
"__floatundikf",
|
||||
"__floatundisf",
|
||||
"__floatunditf",
|
||||
"__floatunsidf",
|
||||
"__floatunsikf",
|
||||
"__floatunsisf",
|
||||
"__floatunsitf",
|
||||
"__floatuntidf",
|
||||
"__floatuntisf",
|
||||
"__floatuntitf",
|
||||
"__gedf2",
|
||||
"__gekf2",
|
||||
"__gesf2",
|
||||
"__getf2",
|
||||
"__gnu_f2h_ieee",
|
||||
"__gnu_h2f_ieee",
|
||||
"__gtdf2",
|
||||
"__gtkf2",
|
||||
"__gtsf2",
|
||||
"__gttf2",
|
||||
"__ledf2",
|
||||
"__lekf2",
|
||||
"__lesf2",
|
||||
"__letf2",
|
||||
"__lshrdi3",
|
||||
"__lshrti3",
|
||||
"__ltdf2",
|
||||
"__ltkf2",
|
||||
"__ltsf2",
|
||||
"__lttf2",
|
||||
"__moddi3",
|
||||
"__modsi3",
|
||||
"__modti3",
|
||||
"__muldc3",
|
||||
"__muldf3",
|
||||
"__muldi3",
|
||||
"__mulkf3",
|
||||
"__mulodi4",
|
||||
"__muloti4",
|
||||
"__mulsc3",
|
||||
"__mulsf3",
|
||||
"__mulsi3",
|
||||
"__multc3",
|
||||
"__multf3",
|
||||
"__multi3",
|
||||
"__mulxc3",
|
||||
"__nedf2",
|
||||
"__negdf2",
|
||||
"__negsf2",
|
||||
"__nekf2",
|
||||
"__nesf2",
|
||||
"__netf2",
|
||||
"__paritydi2",
|
||||
"__paritysi2",
|
||||
"__parityti2",
|
||||
"__popcountdi2",
|
||||
"__popcountsi2",
|
||||
"__popcountti2",
|
||||
"__subdf3",
|
||||
"__subkf3",
|
||||
"__subsf3",
|
||||
"__subtf3",
|
||||
"__truncdfhf2",
|
||||
"__truncdfsf2",
|
||||
"__trunckfdf2",
|
||||
"__trunckfsf2",
|
||||
"__truncsfhf2",
|
||||
"__trunctfdf2",
|
||||
"__trunctfhf2",
|
||||
"__trunctfsf2",
|
||||
"__udivdi3",
|
||||
"__udivmoddi4",
|
||||
"__udivmodsi4",
|
||||
"__udivmodti4",
|
||||
"__udivsi3",
|
||||
"__udivti3",
|
||||
"__umoddi3",
|
||||
"__umodsi3",
|
||||
"__umodti3",
|
||||
"__unorddf2",
|
||||
"__unordkf2",
|
||||
"__unordsf2",
|
||||
"__unordtf2",
|
||||
"__zig_probe_stack",
|
||||
"fmaq",
|
||||
};
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue