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zld: flush MachO

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This commit is contained in:
Jakub Konka 2021-04-08 08:17:38 +02:00
parent db44a7803f
commit 23bb6fa9f4
3 changed files with 161 additions and 156 deletions
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2
src/link/MachO/Object.zig
View File

@ -183,7 +183,7 @@ pub fn readLoadCommands(self: *Object, reader: anytype) !void {
cmd.LinkeditData.dataoff += offset;
},
else => {
log.debug("Unknown load command detected: 0x{x}.", .{cmd.cmd()});
log.warn("Unknown load command detected: 0x{x}.", .{cmd.cmd()});
},
}
self.load_commands.appendAssumeCapacity(cmd);

284
src/link/MachO/Zld.zig
View File

@ -283,7 +283,7 @@ pub fn link(self: *Zld, files: []const []const u8, out_path: []const u8) !void {
try self.allocateStubsAndGotEntries();
try self.writeStubHelperCommon();
try self.resolveRelocsAndWriteSections();
// try self.flush();
try self.flush();
}
fn parseInputFiles(self: *Zld, files: []const []const u8) !void {
@ -386,7 +386,7 @@ fn mapAndUpdateSections(
.target_sect_id = target_sect_id,
.offset = @intCast(u32, offset),
});
log.debug("{s}: {s},{s} mapped to {s},{s} from 0x{x} to 0x{x}", .{
log.warn("{s}: {s},{s} mapped to {s},{s} from 0x{x} to 0x{x}", .{
object.name,
parseName(&source_sect.segname),
parseName(&source_sect.sectname),
@ -596,7 +596,7 @@ fn updateMetadata(self: *Zld) !void {
});
},
else => {
log.debug("unhandled section type 0x{x} for '{s}/{s}'", .{ flags, segname, sectname });
log.warn("unhandled section type 0x{x} for '{s}/{s}'", .{ flags, segname, sectname });
},
}
}
@ -620,7 +620,7 @@ fn updateMetadata(self: *Zld) !void {
const segname = parseName(&source_sect.segname);
const sectname = parseName(&source_sect.sectname);
log.debug("section '{s}/{s}' will be unmapped", .{ segname, sectname });
log.warn("section '{s}/{s}' will be unmapped", .{ segname, sectname });
try self.unhandled_sections.putNoClobber(self.allocator, .{
.object_id = object_id,
.source_sect_id = source_sect_id,
@ -964,7 +964,7 @@ fn allocateSymbols(self: *Zld) !void {
const target_addr = target_sect.addr + target_mapping.offset;
const n_value = source_sym.inner.n_value - source_sect.addr + target_addr;
log.debug("resolving '{s}' symbol at 0x{x}", .{ entry.key, n_value });
log.warn("resolving '{s}' symbol at 0x{x}", .{ entry.key, n_value });
// TODO there might be a more generic way of doing this.
var n_sect: u8 = 0;
@ -1172,7 +1172,7 @@ fn writeLazySymbolPointer(self: *Zld, index: u32) !void {
var buf: [@sizeOf(u64)]u8 = undefined;
mem.writeIntLittle(u64, &buf, end);
const off = la_symbol_ptr.offset + index * @sizeOf(u64);
log.debug("writing lazy symbol pointer entry 0x{x} at 0x{x}", .{ end, off });
log.warn("writing lazy symbol pointer entry 0x{x} at 0x{x}", .{ end, off });
try self.file.?.pwriteAll(&buf, off);
}
@ -1185,7 +1185,7 @@ fn writeStub(self: *Zld, index: u32) !void {
const stub_off = stubs.offset + index * stubs.reserved2;
const stub_addr = stubs.addr + index * stubs.reserved2;
const la_ptr_addr = la_symbol_ptr.addr + index * @sizeOf(u64);
log.debug("writing stub at 0x{x}", .{stub_off});
log.warn("writing stub at 0x{x}", .{stub_off});
var code = try self.allocator.alloc(u8, stubs.reserved2);
defer self.allocator.free(code);
switch (self.arch.?) {
@ -1444,7 +1444,7 @@ fn resolveSymbols(self: *Zld) !void {
fn resolveStubsAndGotEntries(self: *Zld) !void {
for (self.objects.items) |object, object_id| {
log.debug("\nresolving stubs and got entries from {s}", .{object.name});
log.warn("\nresolving stubs and got entries from {s}", .{object.name});
for (object.sections.items) |sect| {
const relocs = sect.relocs orelse continue;
@ -1469,7 +1469,7 @@ fn resolveStubsAndGotEntries(self: *Zld) !void {
.local_index = if (is_import) 0 else reloc.target.symbol,
});
log.debug(" | found GOT entry {s}: {}", .{ sym_name, self.got_entries.get(sym_name) });
log.warn(" | found GOT entry {s}: {}", .{ sym_name, self.got_entries.get(sym_name) });
},
else => {
const sym = object.symtab.items[reloc.target.symbol];
@ -1486,7 +1486,7 @@ fn resolveStubsAndGotEntries(self: *Zld) !void {
const index = @intCast(u32, self.stubs.items().len);
try self.stubs.putNoClobber(self.allocator, name, index);
log.debug(" | found stub {s}: {}", .{ sym_name, self.stubs.get(sym_name) });
log.warn(" | found stub {s}: {}", .{ sym_name, self.stubs.get(sym_name) });
},
}
}
@ -1504,7 +1504,7 @@ fn resolveStubsAndGotEntries(self: *Zld) !void {
.local_index = 0,
});
log.debug(" | found GOT entry dyld_stub_binder: {}", .{self.got_entries.get("dyld_stub_binder")});
log.warn(" | found GOT entry dyld_stub_binder: {}", .{self.got_entries.get("dyld_stub_binder")});
}
fn resolveRelocsAndWriteSections(self: *Zld) !void {
@ -1520,7 +1520,7 @@ fn resolveRelocsAndWriteSections(self: *Zld) !void {
.object_id = @intCast(u16, object_id),
.source_sect_id = @intCast(u16, source_sect_id),
}) orelse {
log.debug("no mapping for {s},{s}; skipping", .{ segname, sectname });
log.warn("no mapping for {s},{s}; skipping", .{ segname, sectname });
continue;
};
const target_seg = self.load_commands.items[target_mapping.target_seg_id].Segment;
@ -2128,6 +2128,7 @@ fn flush(self: *Zld) !void {
try self.file.?.pwriteAll(buffer, sect.offset);
}
try self.writeGotEntries();
try self.setEntryPoint();
try self.writeRebaseInfoTable();
try self.writeBindInfoTable();
@ -2143,7 +2144,8 @@ fn flush(self: *Zld) !void {
symtab.symoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize);
}
try self.writeDebugInfo();
// try self.writeDebugInfo();
try self.populateStringTable();
try self.writeSymbolTable();
try self.writeDynamicSymbolTable();
try self.writeStringTable();
@ -2170,60 +2172,52 @@ fn flush(self: *Zld) !void {
}
}
fn writeGotEntries(self: *Zld) !void {
const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const sect = seg.sections.items[self.got_section_index.?];
var buffer = try self.allocator.alloc(u8, self.got_entries.items().len * @sizeOf(u64));
defer self.allocator.free(buffer);
var stream = std.io.fixedBufferStream(buffer);
var writer = stream.writer();
for (self.got_entries.items()) |entry| {
try writer.writeIntLittle(u64, entry.value.target_addr);
}
log.warn("writing GOT pointers at 0x{x} to 0x{x}", .{ sect.offset, sect.offset + buffer.len });
try self.file.?.pwriteAll(buffer, sect.offset);
}
fn setEntryPoint(self: *Zld) !void {
// TODO we should respect the -entry flag passed in by the user to set a custom
// entrypoint. For now, assume default of `_main`.
const seg = self.load_commands.items[self.text_segment_cmd_index.?].Segment;
const text = seg.sections.items[self.text_section_index.?];
const entry_syms = self.locals.get("_main") orelse return error.MissingMainEntrypoint;
var entry_sym: ?macho.nlist_64 = null;
for (entry_syms.items) |es| {
switch (es.tt) {
.Global => {
entry_sym = es.inner;
break;
},
.WeakGlobal => {
entry_sym = es.inner;
},
.Local => {},
}
}
if (entry_sym == null) {
log.err("no (weak) global definition of _main found", .{});
return error.MissingMainEntrypoint;
}
const name = try self.allocator.dupe(u8, "_main");
try self.exports.putNoClobber(self.allocator, name, .{
.n_strx = entry_sym.?.n_strx,
.n_value = entry_sym.?.n_value,
.n_type = macho.N_SECT | macho.N_EXT,
.n_desc = entry_sym.?.n_desc,
.n_sect = entry_sym.?.n_sect,
});
const entry_sym = self.symtab.get("_main") orelse return error.MissingMainEntrypoint;
const ec = &self.load_commands.items[self.main_cmd_index.?].Main;
ec.entryoff = @intCast(u32, entry_sym.?.n_value - seg.inner.vmaddr);
ec.entryoff = @intCast(u32, entry_sym.inner.n_value - seg.inner.vmaddr);
}
fn writeRebaseInfoTable(self: *Zld) !void {
var pointers = std.ArrayList(Pointer).init(self.allocator);
defer pointers.deinit();
try pointers.ensureCapacity(pointers.items.len + self.local_rebases.items.len);
try pointers.ensureCapacity(self.local_rebases.items.len);
pointers.appendSliceAssumeCapacity(self.local_rebases.items);
if (self.got_section_index) |idx| {
// TODO this should be cleaned up!
try pointers.ensureCapacity(pointers.items.len + self.nonlazy_pointers.items().len);
const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?);
const index_offset = @intCast(u32, self.nonlazy_imports.items().len);
for (self.nonlazy_pointers.items()) |entry| {
const index_offset = @intCast(u32, self.got_entries.items().len);
try pointers.ensureCapacity(pointers.items.len + self.got_entries.items().len);
for (self.got_entries.items()) |entry| {
const index = index_offset + entry.value.index;
pointers.appendAssumeCapacity(.{
.offset = base_offset + index * @sizeOf(u64),
@ -2269,14 +2263,15 @@ fn writeRebaseInfoTable(self: *Zld) !void {
}
if (self.la_symbol_ptr_section_index) |idx| {
try pointers.ensureCapacity(pointers.items.len + self.lazy_imports.items().len);
const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_segment_cmd_index.?);
for (self.lazy_imports.items()) |entry| {
try pointers.ensureCapacity(pointers.items.len + self.stubs.items().len);
for (self.stubs.items()) |entry| {
pointers.appendAssumeCapacity(.{
.offset = base_offset + entry.value.index * @sizeOf(u64),
.offset = base_offset + entry.value * @sizeOf(u64),
.segment_id = segment_id,
});
}
@ -2297,7 +2292,7 @@ fn writeRebaseInfoTable(self: *Zld) !void {
dyld_info.rebase_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @sizeOf(u64)));
seg.inner.filesize += dyld_info.rebase_size;
log.debug("writing rebase info from 0x{x} to 0x{x}", .{ dyld_info.rebase_off, dyld_info.rebase_off + dyld_info.rebase_size });
log.warn("writing rebase info from 0x{x} to 0x{x}", .{ dyld_info.rebase_off, dyld_info.rebase_off + dyld_info.rebase_size });
try self.file.?.pwriteAll(buffer, dyld_info.rebase_off);
}
@ -2307,16 +2302,23 @@ fn writeBindInfoTable(self: *Zld) !void {
defer pointers.deinit();
if (self.got_section_index) |idx| {
try pointers.ensureCapacity(pointers.items.len + self.nonlazy_imports.items().len);
const seg = self.load_commands.items[self.data_const_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_const_segment_cmd_index.?);
for (self.nonlazy_imports.items()) |entry| {
try pointers.ensureCapacity(pointers.items.len + self.got_entries.items().len);
for (self.got_entries.items()) |entry| {
const dylib_ordinal = dylib_ordinal: {
const sym = self.symtab.get(entry.key) orelse continue; // local indirection
if (sym.tag != .Import) continue; // local indirection
break :dylib_ordinal sym.file.? + 1;
};
pointers.appendAssumeCapacity(.{
.offset = base_offset + entry.value.index * @sizeOf(u64),
.segment_id = segment_id,
.dylib_ordinal = entry.value.dylib_ordinal,
.dylib_ordinal = dylib_ordinal,
.name = entry.key,
});
}
@ -2327,10 +2329,14 @@ fn writeBindInfoTable(self: *Zld) !void {
const sect = seg.sections.items[idx];
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_segment_cmd_index.?);
const sym = self.symtab.get("__tlv_bootstrap") orelse unreachable;
const dylib_ordinal = sym.file.? + 1;
try pointers.append(.{
.offset = base_offset + self.tlv_bootstrap.?.index * @sizeOf(u64),
.offset = base_offset,
.segment_id = segment_id,
.dylib_ordinal = self.tlv_bootstrap.?.dylib_ordinal,
.dylib_ordinal = dylib_ordinal,
.name = "__tlv_bootstrap",
});
}
@ -2348,7 +2354,7 @@ fn writeBindInfoTable(self: *Zld) !void {
dyld_info.bind_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)));
seg.inner.filesize += dyld_info.bind_size;
log.debug("writing binding info from 0x{x} to 0x{x}", .{ dyld_info.bind_off, dyld_info.bind_off + dyld_info.bind_size });
log.warn("writing binding info from 0x{x} to 0x{x}", .{ dyld_info.bind_off, dyld_info.bind_off + dyld_info.bind_size });
try self.file.?.pwriteAll(buffer, dyld_info.bind_off);
}
@ -2356,18 +2362,26 @@ fn writeBindInfoTable(self: *Zld) !void {
fn writeLazyBindInfoTable(self: *Zld) !void {
var pointers = std.ArrayList(Pointer).init(self.allocator);
defer pointers.deinit();
try pointers.ensureCapacity(self.lazy_imports.items().len);
if (self.la_symbol_ptr_section_index) |idx| {
const seg = self.load_commands.items[self.data_segment_cmd_index.?].Segment;
const sect = seg.sections.items[idx];
const base_offset = sect.addr - seg.inner.vmaddr;
const segment_id = @intCast(u16, self.data_segment_cmd_index.?);
for (self.lazy_imports.items()) |entry| {
try pointers.ensureCapacity(self.stubs.items().len);
for (self.stubs.items()) |entry| {
const dylib_ordinal = dylib_ordinal: {
const sym = self.symtab.get(entry.key) orelse unreachable;
assert(sym.tag == .Import);
break :dylib_ordinal sym.file.? + 1;
};
pointers.appendAssumeCapacity(.{
.offset = base_offset + entry.value.index * @sizeOf(u64),
.offset = base_offset + entry.value * @sizeOf(u64),
.segment_id = segment_id,
.dylib_ordinal = entry.value.dylib_ordinal,
.dylib_ordinal = dylib_ordinal,
.name = entry.key,
});
}
@ -2386,7 +2400,7 @@ fn writeLazyBindInfoTable(self: *Zld) !void {
dyld_info.lazy_bind_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)));
seg.inner.filesize += dyld_info.lazy_bind_size;
log.debug("writing lazy binding info from 0x{x} to 0x{x}", .{ dyld_info.lazy_bind_off, dyld_info.lazy_bind_off + dyld_info.lazy_bind_size });
log.warn("writing lazy binding info from 0x{x} to 0x{x}", .{ dyld_info.lazy_bind_off, dyld_info.lazy_bind_off + dyld_info.lazy_bind_size });
try self.file.?.pwriteAll(buffer, dyld_info.lazy_bind_off);
try self.populateLazyBindOffsetsInStubHelper(buffer);
@ -2437,7 +2451,7 @@ fn populateLazyBindOffsetsInStubHelper(self: *Zld, buffer: []const u8) !void {
else => {},
}
}
assert(self.lazy_imports.items().len <= offsets.items.len);
assert(self.stubs.items().len <= offsets.items.len);
const stub_size: u4 = switch (self.arch.?) {
.x86_64 => 10,
@ -2450,10 +2464,9 @@ fn populateLazyBindOffsetsInStubHelper(self: *Zld, buffer: []const u8) !void {
else => unreachable,
};
var buf: [@sizeOf(u32)]u8 = undefined;
for (self.lazy_imports.items()) |entry| {
const symbol = entry.value;
const placeholder_off = self.stub_helper_stubs_start_off.? + symbol.index * stub_size + off;
mem.writeIntLittle(u32, &buf, offsets.items[symbol.index]);
for (self.stubs.items()) |entry| {
const placeholder_off = self.stub_helper_stubs_start_off.? + entry.value * stub_size + off;
mem.writeIntLittle(u32, &buf, offsets.items[entry.value]);
try self.file.?.pwriteAll(&buf, placeholder_off);
}
}
@ -2463,11 +2476,16 @@ fn writeExportInfo(self: *Zld) !void {
defer trie.deinit();
const text_segment = self.load_commands.items[self.text_segment_cmd_index.?].Segment;
for (self.exports.items()) |entry| {
for (self.symtab.items()) |entry| {
switch (entry.value.tag) {
.Weak, .Strong => {},
else => continue,
}
const name = entry.key;
const symbol = entry.value;
// TODO figure out if we should put all exports into the export trie
const symbol = entry.value.inner;
assert(symbol.n_value >= text_segment.inner.vmaddr);
try trie.put(.{
.name = name,
.vmaddr_offset = symbol.n_value - text_segment.inner.vmaddr,
@ -2488,7 +2506,7 @@ fn writeExportInfo(self: *Zld) !void {
dyld_info.export_size = @intCast(u32, mem.alignForwardGeneric(u64, buffer.len, @alignOf(u64)));
seg.inner.filesize += dyld_info.export_size;
log.debug("writing export info from 0x{x} to 0x{x}", .{ dyld_info.export_off, dyld_info.export_off + dyld_info.export_size });
log.warn("writing export info from 0x{x} to 0x{x}", .{ dyld_info.export_off, dyld_info.export_off + dyld_info.export_size });
try self.file.?.pwriteAll(buffer, dyld_info.export_off);
}
@ -2508,7 +2526,7 @@ fn writeDebugInfo(self: *Zld) !void {
const compile_unit = debug_info.inner.findCompileUnit(0x0) catch |err| switch (err) {
error.MissingDebugInfo => {
// TODO audit cases with missing debug info and audit our dwarf.zig module.
log.debug("invalid or missing debug info in {s}; skipping", .{object.name});
log.warn("invalid or missing debug info in {s}; skipping", .{object.name});
continue;
},
else => |e| return e,
@ -2558,7 +2576,7 @@ fn writeDebugInfo(self: *Zld) !void {
.n_value = mtime,
});
}
log.debug("analyzing debug info in '{s}'", .{object.name});
log.warn("analyzing debug info in '{s}'", .{object.name});
for (object.symtab.items) |source_sym| {
const symname = object.getString(source_sym.n_strx);
@ -2639,7 +2657,7 @@ fn writeDebugInfo(self: *Zld) !void {
const stabs_off = symtab.symoff;
const stabs_size = symtab.nsyms * @sizeOf(macho.nlist_64);
log.debug("writing symbol stabs from 0x{x} to 0x{x}", .{ stabs_off, stabs_size + stabs_off });
log.warn("writing symbol stabs from 0x{x} to 0x{x}", .{ stabs_off, stabs_size + stabs_off });
try self.file.?.pwriteAll(mem.sliceAsBytes(stabs.items), stabs_off);
linkedit.inner.filesize += stabs_size;
@ -2649,66 +2667,56 @@ fn writeDebugInfo(self: *Zld) !void {
dysymtab.nlocalsym = symtab.nsyms;
}
fn populateStringTable(self: *Zld) !void {
for (self.symtab.items()) |*entry| {
const n_strx = try self.makeString(entry.key);
entry.value.inner.n_strx = n_strx;
}
}
fn writeSymbolTable(self: *Zld) !void {
const seg = &self.load_commands.items[self.linkedit_segment_cmd_index.?].Segment;
const symtab = &self.load_commands.items[self.symtab_cmd_index.?].Symtab;
// TODO figure out how to add locals
var locals = std.ArrayList(macho.nlist_64).init(self.allocator);
defer locals.deinit();
for (self.locals.items()) |entries| {
log.debug("'{s}': {} entries", .{ entries.key, entries.value.items.len });
// var symbol: ?macho.nlist_64 = null;
for (entries.value.items) |entry| {
log.debug(" | {}", .{entry.inner});
log.debug(" | {}", .{entry.tt});
log.debug(" | {s}", .{self.objects.items[entry.object_id].name});
try locals.append(entry.inner);
}
}
const nlocals = locals.items.len;
const nexports = self.exports.items().len;
var exports = std.ArrayList(macho.nlist_64).init(self.allocator);
defer exports.deinit();
try exports.ensureCapacity(nexports);
for (self.exports.items()) |entry| {
exports.appendAssumeCapacity(entry.value);
}
const has_tlv: bool = self.tlv_bootstrap != null;
var nundefs = self.lazy_imports.items().len + self.nonlazy_imports.items().len;
if (has_tlv) nundefs += 1;
var undefs = std.ArrayList(macho.nlist_64).init(self.allocator);
defer undefs.deinit();
try undefs.ensureCapacity(nundefs);
for (self.lazy_imports.items()) |entry| {
undefs.appendAssumeCapacity(entry.value.symbol);
}
for (self.nonlazy_imports.items()) |entry| {
undefs.appendAssumeCapacity(entry.value.symbol);
}
if (has_tlv) {
undefs.appendAssumeCapacity(self.tlv_bootstrap.?.symbol);
for (self.symtab.items()) |entry| {
switch (entry.value.tag) {
.Weak, .Strong => {
try exports.append(entry.value.inner);
},
.Import => {
try undefs.append(entry.value.inner);
},
else => unreachable,
}
}
const nlocals = locals.items.len;
const nexports = exports.items.len;
const nundefs = undefs.items.len;
const locals_off = symtab.symoff + symtab.nsyms * @sizeOf(macho.nlist_64);
const locals_size = nlocals * @sizeOf(macho.nlist_64);
log.debug("writing local symbols from 0x{x} to 0x{x}", .{ locals_off, locals_size + locals_off });
log.warn("writing local symbols from 0x{x} to 0x{x}", .{ locals_off, locals_size + locals_off });
try self.file.?.pwriteAll(mem.sliceAsBytes(locals.items), locals_off);
const exports_off = locals_off + locals_size;
const exports_size = nexports * @sizeOf(macho.nlist_64);
log.debug("writing exported symbols from 0x{x} to 0x{x}", .{ exports_off, exports_size + exports_off });
log.warn("writing exported symbols from 0x{x} to 0x{x}", .{ exports_off, exports_size + exports_off });
try self.file.?.pwriteAll(mem.sliceAsBytes(exports.items), exports_off);
const undefs_off = exports_off + exports_size;
const undefs_size = nundefs * @sizeOf(macho.nlist_64);
log.debug("writing undefined symbols from 0x{x} to 0x{x}", .{ undefs_off, undefs_size + undefs_off });
log.warn("writing undefined symbols from 0x{x} to 0x{x}", .{ undefs_off, undefs_size + undefs_off });
try self.file.?.pwriteAll(mem.sliceAsBytes(undefs.items), undefs_off);
symtab.nsyms += @intCast(u32, nlocals + nexports + nundefs);
@ -2733,44 +2741,45 @@ fn writeDynamicSymbolTable(self: *Zld) !void {
const la_symbol_ptr = &data_segment.sections.items[self.la_symbol_ptr_section_index.?];
const dysymtab = &self.load_commands.items[self.dysymtab_cmd_index.?].Dysymtab;
const lazy = self.lazy_imports.items();
const nonlazy = self.nonlazy_imports.items();
const got_locals = self.nonlazy_pointers.items();
const nstubs = @intCast(u32, self.stubs.items().len);
const ngot_entries = @intCast(u32, self.got_entries.items().len);
dysymtab.indirectsymoff = @intCast(u32, seg.inner.fileoff + seg.inner.filesize);
dysymtab.nindirectsyms = @intCast(u32, lazy.len * 2 + nonlazy.len + got_locals.len);
dysymtab.nindirectsyms = nstubs * 2 + ngot_entries;
const needed_size = dysymtab.nindirectsyms * @sizeOf(u32);
seg.inner.filesize += needed_size;
log.debug("writing indirect symbol table from 0x{x} to 0x{x}", .{
log.warn("writing indirect symbol table from 0x{x} to 0x{x}", .{
dysymtab.indirectsymoff,
dysymtab.indirectsymoff + needed_size,
});
var buf = try self.allocator.alloc(u8, needed_size);
defer self.allocator.free(buf);
var stream = std.io.fixedBufferStream(buf);
var writer = stream.writer();
stubs.reserved1 = 0;
for (lazy) |_, i| {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + i);
for (self.stubs.items()) |entry| {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + entry.value);
try writer.writeIntLittle(u32, symtab_idx);
}
const base_id = @intCast(u32, lazy.len);
got.reserved1 = base_id;
for (nonlazy) |_, i| {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + i + base_id);
try writer.writeIntLittle(u32, symtab_idx);
}
// TODO there should be one common set of GOT entries.
for (got_locals) |_| {
try writer.writeIntLittle(u32, macho.INDIRECT_SYMBOL_LOCAL);
got.reserved1 = nstubs;
for (self.got_entries.items()) |entry| {
if (entry.value.tag == .import) {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + entry.value.index + nstubs);
try writer.writeIntLittle(u32, symtab_idx);
} else {
try writer.writeIntLittle(u32, macho.INDIRECT_SYMBOL_LOCAL);
}
}
la_symbol_ptr.reserved1 = got.reserved1 + @intCast(u32, nonlazy.len) + @intCast(u32, got_locals.len);
for (lazy) |_, i| {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + i);
la_symbol_ptr.reserved1 = got.reserved1 + ngot_entries;
for (self.stubs.items()) |entry| {
const symtab_idx = @intCast(u32, dysymtab.iundefsym + entry.value);
try writer.writeIntLittle(u32, symtab_idx);
}
@ -2784,7 +2793,7 @@ fn writeStringTable(self: *Zld) !void {
symtab.strsize = @intCast(u32, mem.alignForwardGeneric(u64, self.strtab.items.len, @alignOf(u64)));
seg.inner.filesize += symtab.strsize;
log.debug("writing string table from 0x{x} to 0x{x}", .{ symtab.stroff, symtab.stroff + symtab.strsize });
log.warn("writing string table from 0x{x} to 0x{x}", .{ symtab.stroff, symtab.stroff + symtab.strsize });
try self.file.?.pwriteAll(self.strtab.items, symtab.stroff);
@ -2830,7 +2839,7 @@ fn writeDataInCode(self: *Zld) !void {
dice_cmd.datasize = datasize;
seg.inner.filesize += datasize;
log.debug("writing data-in-code from 0x{x} to 0x{x}", .{ fileoff, fileoff + datasize });
log.warn("writing data-in-code from 0x{x} to 0x{x}", .{ fileoff, fileoff + datasize });
try self.file.?.pwriteAll(buf.items, fileoff);
}
@ -2851,7 +2860,7 @@ fn writeCodeSignaturePadding(self: *Zld) !void {
seg.inner.filesize += needed_size;
seg.inner.vmsize = mem.alignForwardGeneric(u64, seg.inner.filesize, self.page_size.?);
log.debug("writing code signature padding from 0x{x} to 0x{x}", .{ fileoff, fileoff + needed_size });
log.warn("writing code signature padding from 0x{x} to 0x{x}", .{ fileoff, fileoff + needed_size });
// Pad out the space. We need to do this to calculate valid hashes for everything in the file
// except for code signature data.
@ -2877,7 +2886,7 @@ fn writeCodeSignature(self: *Zld) !void {
var stream = std.io.fixedBufferStream(buffer);
try code_sig.write(stream.writer());
log.debug("writing code signature from 0x{x} to 0x{x}", .{ code_sig_cmd.dataoff, code_sig_cmd.dataoff + buffer.len });
log.warn("writing code signature from 0x{x} to 0x{x}", .{ code_sig_cmd.dataoff, code_sig_cmd.dataoff + buffer.len });
try self.file.?.pwriteAll(buffer, code_sig_cmd.dataoff);
}
@ -2895,7 +2904,7 @@ fn writeLoadCommands(self: *Zld) !void {
}
const off = @sizeOf(macho.mach_header_64);
log.debug("writing {} load commands from 0x{x} to 0x{x}", .{ self.load_commands.items.len, off, off + sizeofcmds });
log.warn("writing {} load commands from 0x{x} to 0x{x}", .{ self.load_commands.items.len, off, off + sizeofcmds });
try self.file.?.pwriteAll(buffer, off);
}
@ -2933,7 +2942,7 @@ fn writeHeader(self: *Zld) !void {
for (self.load_commands.items) |cmd| {
header.sizeofcmds += cmd.cmdsize();
}
log.debug("writing Mach-O header {}", .{header});
log.warn("writing Mach-O header {}", .{header});
try self.file.?.pwriteAll(mem.asBytes(&header), 0);
}
@ -2947,7 +2956,7 @@ pub fn makeStaticString(bytes: []const u8) [16]u8 {
fn makeString(self: *Zld, bytes: []const u8) !u32 {
try self.strtab.ensureCapacity(self.allocator, self.strtab.items.len + bytes.len + 1);
const offset = @intCast(u32, self.strtab.items.len);
log.debug("writing new string '{s}' into string table at offset 0x{x}", .{ bytes, offset });
log.warn("writing new string '{s}' into string table at offset 0x{x}", .{ bytes, offset });
self.strtab.appendSliceAssumeCapacity(bytes);
self.strtab.appendAssumeCapacity(0);
return offset;
@ -2963,11 +2972,6 @@ pub fn parseName(name: *const [16]u8) []const u8 {
return name[0..len];
}
fn aarch64IsArithmetic(inst: *const [4]u8) callconv(.Inline) bool {
const group_decode = @truncate(u5, inst[3]);
return ((group_decode >> 2) == 4);
}
fn printDebug(self: Zld) void {
log.warn("symtab", .{});
for (self.symtab.items()) |entry| {

31
src/link/MachO/reloc.zig
View File

@ -33,7 +33,8 @@ pub const Relocation = struct {
log.warn(" | offset 0x{x}", .{base.offset});
log.warn(" | source address 0x{x}", .{args.source_addr});
log.warn(" | target address 0x{x}", .{args.target_addr});
log.warn(" | subtractor address 0x{x}", .{args.subtractor});
if (args.subtractor) |sub|
log.warn(" | subtractor address 0x{x}", .{sub});
return switch (base.@"type") {
.branch => @fieldParentPtr(Branch, "base", base).resolve(args.source_addr, args.target_addr),
@ -307,12 +308,12 @@ const RelocIterator = struct {
self.index += 1;
if (self.index < self.buffer.len) {
const reloc = self.buffer[@intCast(u64, self.index)];
log.warn("{s}", .{@intToEnum(macho.reloc_type_arm64, reloc.r_type)});
log.warn(" | offset = {}", .{reloc.r_address});
log.warn(" | PC = {}", .{reloc.r_pcrel == 1});
log.warn(" | length = {}", .{reloc.r_length});
log.warn(" | symbolnum = {}", .{reloc.r_symbolnum});
log.warn(" | extern = {}", .{reloc.r_extern == 1});
log.debug("{s}", .{@intToEnum(macho.reloc_type_arm64, reloc.r_type)});
log.debug(" | offset = {}", .{reloc.r_address});
log.debug(" | PC = {}", .{reloc.r_pcrel == 1});
log.debug(" | length = {}", .{reloc.r_length});
log.debug(" | symbolnum = {}", .{reloc.r_symbolnum});
log.debug(" | extern = {}", .{reloc.r_extern == 1});
return reloc;
}
return null;
@ -432,7 +433,7 @@ const Parser = struct {
.inst = parsed_inst,
};
log.warn(" | emitting {}", .{branch});
log.debug(" | emitting {}", .{branch});
try parser.parsed.append(&branch.base);
}
@ -471,7 +472,7 @@ const Parser = struct {
.inst = parsed_inst,
};
log.warn(" | emitting {}", .{page});
log.debug(" | emitting {}", .{page});
break :ptr &page.base;
},
@ -489,7 +490,7 @@ const Parser = struct {
.inst = parsed_inst,
};
log.warn(" | emitting {}", .{page});
log.debug(" | emitting {}", .{page});
break :ptr &page.base;
},
@ -507,7 +508,7 @@ const Parser = struct {
.inst = parsed_inst,
};
log.warn(" | emitting {}", .{page});
log.debug(" | emitting {}", .{page});
break :ptr &page.base;
},
@ -564,7 +565,7 @@ const Parser = struct {
.addend = parser.addend,
};
log.warn(" | emitting {}", .{page_off});
log.debug(" | emitting {}", .{page_off});
try parser.parsed.append(&page_off.base);
}
@ -601,7 +602,7 @@ const Parser = struct {
},
};
log.warn(" | emitting {}", .{page_off});
log.debug(" | emitting {}", .{page_off});
try parser.parsed.append(&page_off.base);
}
@ -668,7 +669,7 @@ const Parser = struct {
},
};
log.warn(" | emitting {}", .{page_off});
log.debug(" | emitting {}", .{page_off});
try parser.parsed.append(&page_off.base);
}
@ -729,7 +730,7 @@ const Parser = struct {
.addend = addend,
};
log.warn(" | emitting {}", .{unsigned});
log.debug(" | emitting {}", .{unsigned});
try parser.parsed.append(&unsigned.base);
}
};