Merge pull request #7273 from kubkon/lld-codesig-poc

lld+macho: patch lld output on Apple Silicon by calculating and embedding adhoc code signature

Author: andrewrk

src/codegen.zig

@@ -1795,7 +1795,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
                 if (inst.func.cast(ir.Inst.Constant)) |func_inst| {
                     if (func_inst.val.cast(Value.Payload.Function)) |func_val| {
                         const func = func_val.func;
-                        const got = &macho_file.sections.items[macho_file.got_section_index.?];
+                        const text_segment = &macho_file.load_commands.items[macho_file.text_segment_cmd_index.?].Segment;
+                        const got = &text_segment.sections.items[macho_file.got_section_index.?];
                         const got_addr = got.addr + func.owner_decl.link.macho.offset_table_index * @sizeOf(u64);
                         switch (arch) {
                             .x86_64 => {
@@ -3196,7 +3197,8 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
                             return MCValue{ .memory = got_addr };
                         } else if (self.bin_file.cast(link.File.MachO)) |macho_file| {
                             const decl = payload.decl;
-                            const got = &macho_file.sections.items[macho_file.got_section_index.?];
+                            const text_segment = &macho_file.load_commands.items[macho_file.text_segment_cmd_index.?].Segment;
+                            const got = &text_segment.sections.items[macho_file.got_section_index.?];
                             const got_addr = got.addr + decl.link.macho.offset_table_index * ptr_bytes;
                             return MCValue{ .memory = got_addr };
                         } else if (self.bin_file.cast(link.File.Coff)) |coff_file| {

src/link.zig

@@ -238,6 +238,14 @@ pub const File = struct {
     }
 
     pub fn makeExecutable(base: *File) !void {
+        switch (base.options.output_mode) {
+            .Obj => return,
+            .Lib => switch (base.options.link_mode) {
+                .Static => return,
+                .Dynamic => {},
+            },
+            .Exe => {},
+        }
         switch (base.tag) {
             .macho => if (base.file) |f| {
                 if (base.intermediary_basename != null) {