zld: clean up logic for matching and mapping sections
This commit is contained in:
Jakub Konka
@@ -503,217 +503,22 @@ fn mapAndUpdateSections(
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fn updateMetadata(self: *Zld) !void {
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for (self.objects.items) |object| {
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const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment;
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const data_const_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
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const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment;
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// Create missing metadata
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for (object.sections.items) |sect| {
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const segname = sect.segname();
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const sectname = sect.sectname();
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switch (sect.sectionType()) {
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macho.S_4BYTE_LITERALS, macho.S_8BYTE_LITERALS, macho.S_16BYTE_LITERALS, macho.S_LITERAL_POINTERS => {
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if (self.text_const_section_index != null) continue;
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self.text_const_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__const", "__TEXT", .{});
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continue;
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},
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macho.S_CSTRING_LITERALS => {
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if (self.cstring_section_index != null) continue;
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self.cstring_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__cstring", "__TEXT", .{
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.flags = macho.S_CSTRING_LITERALS,
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});
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continue;
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},
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macho.S_MOD_INIT_FUNC_POINTERS => {
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if (self.mod_init_func_section_index != null) continue;
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self.mod_init_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__mod_init_func", "__DATA_CONST", .{
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.flags = macho.S_MOD_INIT_FUNC_POINTERS,
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});
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continue;
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},
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macho.S_MOD_TERM_FUNC_POINTERS => {
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if (self.mod_term_func_section_index != null) continue;
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self.mod_term_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__mod_term_func", "__DATA_CONST", .{
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.flags = macho.S_MOD_TERM_FUNC_POINTERS,
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});
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continue;
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},
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macho.S_ZEROFILL => {
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if (mem.eql(u8, sectname, "__common")) {
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if (self.common_section_index != null) continue;
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self.common_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__common", "__DATA", .{
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.flags = macho.S_ZEROFILL,
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});
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} else {
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if (self.bss_section_index != null) continue;
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self.bss_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__bss", "__DATA", .{
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.flags = macho.S_ZEROFILL,
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});
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}
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continue;
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},
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macho.S_THREAD_LOCAL_VARIABLES => {
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if (self.tlv_section_index != null) continue;
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self.tlv_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_vars", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_VARIABLES,
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});
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continue;
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},
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macho.S_THREAD_LOCAL_REGULAR => {
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if (self.tlv_data_section_index != null) continue;
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self.tlv_data_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_data", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_REGULAR,
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});
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continue;
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},
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macho.S_THREAD_LOCAL_ZEROFILL => {
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if (self.tlv_bss_section_index != null) continue;
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self.tlv_bss_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_bss", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_ZEROFILL,
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});
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continue;
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},
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macho.S_COALESCED => {
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if (mem.eql(u8, "__TEXT", segname) and mem.eql(u8, "__eh_frame", sectname)) {
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// TODO I believe __eh_frame is currently part of __unwind_info section
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// in the latest ld64 output.
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if (self.eh_frame_section_index != null) continue;
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self.eh_frame_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__eh_frame", "__TEXT", .{});
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continue;
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}
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// TODO audit this: is this the right mapping?
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if (self.data_const_section_index != null) continue;
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self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
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continue;
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},
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macho.S_REGULAR => {
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if (sect.isCode()) {
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if (self.text_section_index != null) continue;
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self.text_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__text", "__TEXT", .{
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.flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS,
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});
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continue;
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}
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if (sect.isDebug()) {
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if (mem.eql(u8, "__LD", segname) and mem.eql(u8, "__compact_unwind", sectname)) {
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log.debug("TODO compact unwind section: type 0x{x}, name '{s},{s}'", .{
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sect.flags(), segname, sectname,
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});
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}
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continue;
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}
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if (mem.eql(u8, segname, "__TEXT")) {
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if (mem.eql(u8, sectname, "__ustring")) {
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if (self.ustring_section_index != null) continue;
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self.ustring_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__ustring", "__TEXT", .{});
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} else if (mem.eql(u8, sectname, "__gcc_except_tab")) {
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if (self.gcc_except_tab_section_index != null) continue;
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self.gcc_except_tab_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__gcc_except_tab", "__TEXT", .{});
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} else {
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if (self.text_const_section_index != null) continue;
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self.text_const_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__const", "__TEXT", .{});
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}
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continue;
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}
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if (mem.eql(u8, segname, "__DATA_CONST")) {
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if (self.data_const_section_index != null) continue;
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self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
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continue;
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}
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if (mem.eql(u8, segname, "__DATA")) {
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if (mem.eql(u8, sectname, "__const")) {
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if (self.data_const_section_index != null) continue;
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self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
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} else if (mem.eql(u8, sectname, "__cfstring")) {
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if (self.objc_cfstring_section_index != null) continue;
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self.objc_cfstring_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__cfstring", "__DATA_CONST", .{});
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} else {
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if (self.data_section_index != null) continue;
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self.data_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__data", "__DATA", .{});
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}
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continue;
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}
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if (mem.eql(u8, "__LLVM", segname) and mem.eql(u8, "__asm", sectname)) {
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log.debug("TODO LLVM asm section: type 0x{x}, name '{s},{s}'", .{
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sect.flags(), segname, sectname,
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});
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continue;
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}
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},
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else => {},
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}
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log.err("{s}: unhandled section type 0x{x} for '{s},{s}'", .{
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object.name.?,
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sect.flags(),
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segname,
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sectname,
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});
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return error.UnhandledSection;
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}
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// Find ideal section alignment.
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for (object.sections.items) |sect| {
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if (self.getMatchingSection(sect)) |res| {
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const target_seg = &self.load_commands.items[res.seg].Segment;
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const target_sect = &target_seg.sections.items[res.sect];
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target_sect.@"align" = math.max(target_sect.@"align", sect.inner.@"align");
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}
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}
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// Update section mappings
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// Find ideal section alignment and update section mappings
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for (object.sections.items) |sect, sect_id| {
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if (self.getMatchingSection(sect)) |res| {
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try self.mapAndUpdateSections(object, @intCast(u16, sect_id), res.seg, res.sect);
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const match = (try self.getMatchingSection(sect)) orelse {
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log.debug("{s}: unhandled section type 0x{x} for '{s},{s}'", .{
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object.name.?,
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sect.flags(),
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sect.segname(),
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sect.sectname(),
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});
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continue;
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}
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log.debug("section '{s},{s}' will be unmapped", .{ sect.segname(), sect.sectname() });
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};
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const target_seg = &self.load_commands.items[match.seg].Segment;
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const target_sect = &target_seg.sections.items[match.sect];
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target_sect.@"align" = math.max(target_sect.@"align", sect.inner.@"align");
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try self.mapAndUpdateSections(object, @intCast(u16, sect_id), match.seg, match.sect);
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}
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}
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@@ -798,31 +603,60 @@ const MatchingSection = struct {
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sect: u16,
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};
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fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
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fn getMatchingSection(self: *Zld, sect: Object.Section) !?MatchingSection {
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const text_seg = &self.load_commands.items[self.text_segment_cmd_index.?].Segment;
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const data_const_seg = &self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
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const data_seg = &self.load_commands.items[self.data_segment_cmd_index.?].Segment;
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const segname = sect.segname();
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const sectname = sect.sectname();
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const res: ?MatchingSection = blk: {
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switch (sect.sectionType()) {
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macho.S_4BYTE_LITERALS, macho.S_8BYTE_LITERALS, macho.S_16BYTE_LITERALS, macho.S_LITERAL_POINTERS => {
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if (self.text_const_section_index == null) {
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self.text_const_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__const", "__TEXT", .{});
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}
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break :blk .{
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.seg = self.text_segment_cmd_index.?,
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.sect = self.text_const_section_index.?,
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};
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},
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macho.S_CSTRING_LITERALS => {
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if (self.cstring_section_index == null) {
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self.cstring_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__cstring", "__TEXT", .{
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.flags = macho.S_CSTRING_LITERALS,
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});
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}
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break :blk .{
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.seg = self.text_segment_cmd_index.?,
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.sect = self.cstring_section_index.?,
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};
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},
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macho.S_MOD_INIT_FUNC_POINTERS => {
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if (self.mod_init_func_section_index == null) {
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self.mod_init_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__mod_init_func", "__DATA_CONST", .{
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.flags = macho.S_MOD_INIT_FUNC_POINTERS,
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});
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}
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break :blk .{
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.seg = self.data_const_segment_cmd_index.?,
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.sect = self.mod_init_func_section_index.?,
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};
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},
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macho.S_MOD_TERM_FUNC_POINTERS => {
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if (self.mod_term_func_section_index == null) {
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self.mod_term_func_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__mod_term_func", "__DATA_CONST", .{
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.flags = macho.S_MOD_TERM_FUNC_POINTERS,
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});
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}
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break :blk .{
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.seg = self.data_const_segment_cmd_index.?,
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.sect = self.mod_term_func_section_index.?,
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@@ -830,11 +664,25 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
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},
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macho.S_ZEROFILL => {
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if (mem.eql(u8, sectname, "__common")) {
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if (self.common_section_index == null) {
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self.common_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__common", "__DATA", .{
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.flags = macho.S_ZEROFILL,
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});
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}
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break :blk .{
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.seg = self.data_segment_cmd_index.?,
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.sect = self.common_section_index.?,
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};
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} else {
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if (self.bss_section_index == null) {
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self.bss_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__bss", "__DATA", .{
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.flags = macho.S_ZEROFILL,
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});
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}
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break :blk .{
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.seg = self.data_segment_cmd_index.?,
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.sect = self.bss_section_index.?,
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@@ -842,18 +690,39 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
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}
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},
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macho.S_THREAD_LOCAL_VARIABLES => {
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if (self.tlv_section_index == null) {
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self.tlv_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_vars", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_VARIABLES,
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});
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}
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break :blk .{
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.seg = self.data_segment_cmd_index.?,
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.sect = self.tlv_section_index.?,
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};
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},
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macho.S_THREAD_LOCAL_REGULAR => {
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if (self.tlv_data_section_index == null) {
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self.tlv_data_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_data", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_REGULAR,
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});
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}
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break :blk .{
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.seg = self.data_segment_cmd_index.?,
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.sect = self.tlv_data_section_index.?,
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};
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},
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macho.S_THREAD_LOCAL_ZEROFILL => {
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if (self.tlv_bss_section_index == null) {
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self.tlv_bss_section_index = @intCast(u16, data_seg.sections.items.len);
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try data_seg.addSection(self.allocator, "__thread_bss", "__DATA", .{
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.flags = macho.S_THREAD_LOCAL_ZEROFILL,
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});
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}
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break :blk .{
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.seg = self.data_segment_cmd_index.?,
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.sect = self.tlv_bss_section_index.?,
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@@ -861,12 +730,25 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
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},
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macho.S_COALESCED => {
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if (mem.eql(u8, "__TEXT", segname) and mem.eql(u8, "__eh_frame", sectname)) {
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// TODO I believe __eh_frame is currently part of __unwind_info section
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// in the latest ld64 output.
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if (self.eh_frame_section_index == null) {
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self.eh_frame_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__eh_frame", "__TEXT", .{});
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}
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break :blk .{
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.seg = self.text_segment_cmd_index.?,
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.sect = self.eh_frame_section_index.?,
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};
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}
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// TODO audit this: is this the right mapping?
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if (self.data_const_section_index == null) {
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self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
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try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
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}
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break :blk .{
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.seg = self.data_const_segment_cmd_index.?,
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.sect = self.data_const_section_index.?,
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@@ -874,6 +756,13 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
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},
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macho.S_REGULAR => {
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if (sect.isCode()) {
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if (self.text_section_index == null) {
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self.text_section_index = @intCast(u16, text_seg.sections.items.len);
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try text_seg.addSection(self.allocator, "__text", "__TEXT", .{
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.flags = macho.S_REGULAR | macho.S_ATTR_PURE_INSTRUCTIONS | macho.S_ATTR_SOME_INSTRUCTIONS,
|
||||
});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.text_segment_cmd_index.?,
|
||||
.sect = self.text_section_index.?,
|
||||
@@ -881,21 +770,41 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
|
||||
}
|
||||
if (sect.isDebug()) {
|
||||
// TODO debug attributes
|
||||
if (mem.eql(u8, "__LD", segname) and mem.eql(u8, "__compact_unwind", sectname)) {
|
||||
log.debug("TODO compact unwind section: type 0x{x}, name '{s},{s}'", .{
|
||||
sect.flags(), segname, sectname,
|
||||
});
|
||||
}
|
||||
break :blk null;
|
||||
}
|
||||
|
||||
if (mem.eql(u8, segname, "__TEXT")) {
|
||||
if (mem.eql(u8, sectname, "__ustring")) {
|
||||
if (self.ustring_section_index == null) {
|
||||
self.ustring_section_index = @intCast(u16, text_seg.sections.items.len);
|
||||
try text_seg.addSection(self.allocator, "__ustring", "__TEXT", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.text_segment_cmd_index.?,
|
||||
.sect = self.ustring_section_index.?,
|
||||
};
|
||||
} else if (mem.eql(u8, sectname, "__gcc_except_tab")) {
|
||||
if (self.gcc_except_tab_section_index == null) {
|
||||
self.gcc_except_tab_section_index = @intCast(u16, text_seg.sections.items.len);
|
||||
try text_seg.addSection(self.allocator, "__gcc_except_tab", "__TEXT", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.text_segment_cmd_index.?,
|
||||
.sect = self.gcc_except_tab_section_index.?,
|
||||
};
|
||||
} else {
|
||||
if (self.text_const_section_index == null) {
|
||||
self.text_const_section_index = @intCast(u16, text_seg.sections.items.len);
|
||||
try text_seg.addSection(self.allocator, "__const", "__TEXT", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.text_segment_cmd_index.?,
|
||||
.sect = self.text_const_section_index.?,
|
||||
@@ -904,6 +813,11 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
|
||||
}
|
||||
|
||||
if (mem.eql(u8, segname, "__DATA_CONST")) {
|
||||
if (self.data_const_section_index == null) {
|
||||
self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
|
||||
try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.data_const_segment_cmd_index.?,
|
||||
.sect = self.data_const_section_index.?,
|
||||
@@ -912,20 +826,42 @@ fn getMatchingSection(self: *Zld, sect: Object.Section) ?MatchingSection {
|
||||
|
||||
if (mem.eql(u8, segname, "__DATA")) {
|
||||
if (mem.eql(u8, sectname, "__const")) {
|
||||
if (self.data_const_section_index == null) {
|
||||
self.data_const_section_index = @intCast(u16, data_const_seg.sections.items.len);
|
||||
try data_const_seg.addSection(self.allocator, "__const", "__DATA_CONST", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.data_const_segment_cmd_index.?,
|
||||
.sect = self.data_const_section_index.?,
|
||||
};
|
||||
} else if (mem.eql(u8, sectname, "__cfstring")) {
|
||||
if (self.objc_cfstring_section_index == null) {
|
||||
self.objc_cfstring_section_index = @intCast(u16, data_const_seg.sections.items.len);
|
||||
try data_const_seg.addSection(self.allocator, "__cfstring", "__DATA_CONST", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.data_const_segment_cmd_index.?,
|
||||
.sect = self.objc_cfstring_section_index.?,
|
||||
};
|
||||
} else {
|
||||
if (self.data_section_index == null) {
|
||||
self.data_section_index = @intCast(u16, data_seg.sections.items.len);
|
||||
try data_seg.addSection(self.allocator, "__data", "__DATA", .{});
|
||||
}
|
||||
|
||||
break :blk .{
|
||||
.seg = self.data_segment_cmd_index.?,
|
||||
.sect = self.data_section_index.?,
|
||||
};
|
||||
}
|
||||
break :blk .{
|
||||
.seg = self.data_segment_cmd_index.?,
|
||||
.sect = self.data_section_index.?,
|
||||
};
|
||||
}
|
||||
|
||||
if (mem.eql(u8, "__LLVM", segname) and mem.eql(u8, "__asm", sectname)) {
|
||||
log.debug("TODO LLVM asm section: type 0x{x}, name '{s},{s}'", .{
|
||||
sect.flags(), segname, sectname,
|
||||
});
|
||||
}
|
||||
|
||||
break :blk null;
|
||||
|
||||
Reference in New Issue
Block a user