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macho: emit TLS sections

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This commit is contained in:
Jakub Konka 2023-04-04 08:48:48 +02:00
parent cf9ba2965e
commit 1795b8eb4e
1 changed files with 29 additions and 1 deletions
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30
src/link/MachO.zig
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@ -138,6 +138,8 @@ got_section_index: ?u8 = null,
data_const_section_index: ?u8 = null,
la_symbol_ptr_section_index: ?u8 = null,
data_section_index: ?u8 = null,
tls_vars_section_index: ?u8 = null,
tls_data_section_index: ?u8 = null,
locals: std.ArrayListUnmanaged(macho.nlist_64) = .{},
globals: std.ArrayListUnmanaged(SymbolWithLoc) = .{},
@ -2366,6 +2368,7 @@ fn getDeclOutputSection(self: *MachO, decl_index: Module.Decl.Index) u8 {
const val = decl.val;
const zig_ty = ty.zigTypeTag();
const mode = self.base.options.optimize_mode;
const single_threaded = self.base.options.single_threaded;
const sect_id: u8 = blk: {
// TODO finish and audit this function
if (val.isUndefDeep()) {
@ -2376,7 +2379,10 @@ fn getDeclOutputSection(self: *MachO, decl_index: Module.Decl.Index) u8 {
}
}
if (val.castTag(.variable)) |_| {
if (val.castTag(.variable)) |variable| {
if (variable.data.is_threadlocal and !single_threaded) {
break :blk self.tls_data_section_index.?;
}
break :blk self.data_section_index.?;
}
@ -2800,6 +2806,28 @@ fn populateMissingMetadata(self: *MachO) !void {
self.segment_table_dirty = true;
}
if (!self.base.options.single_threaded) {
if (self.tls_vars_section_index == null) {
self.tls_vars_section_index = try self.allocateSection("__DATA2", "__thread_vars", .{
.size = @sizeOf(u64) * 3,
.alignment = @alignOf(u64),
.flags = macho.S_THREAD_LOCAL_VARIABLES,
.prot = macho.PROT.READ | macho.PROT.WRITE,
});
self.segment_table_dirty = true;
}
if (self.tls_data_section_index == null) {
self.tls_data_section_index = try self.allocateSection("__DATA3", "__thread_data", .{
.size = @sizeOf(u64),
.alignment = @alignOf(u64),
.flags = macho.S_THREAD_LOCAL_REGULAR,
.prot = macho.PROT.READ | macho.PROT.WRITE,
});
self.segment_table_dirty = true;
}
}
if (self.linkedit_segment_cmd_index == null) {
self.linkedit_segment_cmd_index = @intCast(u8, self.segments.items.len);