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macho: create an explicit symbol and atom for dyld entry in __data

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This way, we will be able to refer to that atom dynamically via
relocations rather than requiring hardcoded addressing upfront.
This commit is contained in:
Jakub Konka 2021-08-21 11:51:50 +02:00
parent 792fd9c4a3
commit 2d10c52b3c
1 changed files with 26 additions and 0 deletions
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26
src/link/MachO.zig
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@ -143,6 +143,7 @@ unresolved: std.AutoArrayHashMapUnmanaged(u32, void) = .{},
locals_free_list: std.ArrayListUnmanaged(u32) = .{},
globals_free_list: std.ArrayListUnmanaged(u32) = .{},
dyld_private_sym_index: ?u32 = null,
dyld_stub_binder_index: ?u32 = null,
stub_helper_stubs_start_off: ?u64 = null,
@ -758,6 +759,7 @@ pub fn flush(self: *MachO, comp: *Compilation) !void {
try self.parseLibs(libs.items, self.base.options.sysroot);
try self.resolveSymbols();
try self.resolveDyldStubBinder();
try self.createDyldPrivateAtom();
if (!use_stage1) {
// TODO this should be made common when I figure out how to prealloc space for traditional linker path.
@ -1963,7 +1965,31 @@ fn createEmptyAtom(
return block;
}
fn createDyldPrivateAtom(self: *MachO) !void {
if (self.dyld_private_sym_index != null) return;
const match = MatchingSection{
.seg = self.data_segment_cmd_index.?,
.sect = self.data_section_index.?,
};
const local_sym_index = @intCast(u32, self.locals.items.len);
try self.locals.append(self.base.allocator, .{
.n_strx = try self.makeString("dyld_private"),
.n_type = macho.N_SECT,
.n_sect = 0,
.n_desc = 0,
.n_value = 0,
});
_ = try self.createEmptyAtom(match, local_sym_index, @sizeOf(u64), 3);
self.dyld_private_sym_index = local_sym_index;
}
// fn createStubHelperPreambleAtom(self: *MachO) !void {
// const match = MatchingSection{
// .seg = self.text_segment_cmd_index.?,
// .sect = self.stub_helper_section_index.?,
// };
// switch (self.base.options.target.cpu.arch) {
// .x86_64 => {
// const code_size = 15;