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coff: write data directory and section headers to file

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This commit is contained in:
Jakub Konka 2022-08-27 18:10:29 +02:00
parent 93127a615b
commit 9fc6933418
1 changed files with 73 additions and 68 deletions
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141
src/link/Coff.zig
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@ -38,6 +38,7 @@ error_flags: link.File.ErrorFlags = .{},
ptr_width: PtrWidth,
sections: std.MultiArrayList(Section) = .{},
data_directories: std.ArrayListUnmanaged(coff.ImageDataDirectory) = .{},
text_section_index: ?u16 = null,
got_section_index: ?u16 = null,
@ -49,8 +50,6 @@ locals_free_list: std.ArrayListUnmanaged(u32) = .{},
strtab: StringTable(.strtab) = .{},
symtab_offset: ?u32 = null,
got_entries: std.AutoArrayHashMapUnmanaged(SymbolWithLoc, u32) = .{},
got_entries_free_list: std.ArrayListUnmanaged(u32) = .{},
@ -73,6 +72,7 @@ const default_section_alignment: u16 = 0x1000;
const default_file_alignment: u16 = 0x200;
const default_image_base_dll: u64 = 0x10000000;
const default_image_base_exe: u64 = 0x10000;
const default_header_size: u64 = default_section_alignment;
const Section = struct {
header: coff.SectionHeader,
@ -192,6 +192,7 @@ pub fn deinit(self: *Coff) void {
free_list.deinit(gpa);
}
self.sections.deinit(gpa);
self.data_directories.deinit(gpa);
for (self.managed_atoms.items) |atom| {
gpa.destroy(atom);
@ -209,11 +210,8 @@ pub fn deinit(self: *Coff) void {
}
fn populateMissingMetadata(self: *Coff) !void {
log.debug("{x}", .{msdos_stub.len});
if (self.text_section_index == null) {}
if (self.got_section_index == null) {}
if (self.symtab_offset == null) {}
}
pub fn allocateDeclIndexes(self: *Coff, decl_index: Module.Decl.Index) !void {
@ -662,6 +660,8 @@ pub fn flushModule(self: *Coff, comp: *Compilation, prog_node: *std.Progress.Nod
sub_prog_node.activate();
defer sub_prog_node.end();
try self.writeDataDirectoriesHeaders();
try self.writeSectionHeaders();
try self.writeHeader();
if (self.entry_addr == null and self.base.options.output_mode == .Exe) {
@ -692,24 +692,28 @@ pub fn updateDeclLineNumber(self: *Coff, module: *Module, decl: *Module.Decl) !v
log.debug("TODO implement updateDeclLineNumber", .{});
}
fn writeSectionHeaders(self: *Coff) !void {
const offset = self.getSectionHeadersOffset();
try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.sections.items(.header)), offset);
}
fn writeDataDirectoriesHeaders(self: *Coff) !void {
const offset = self.getDataDirectoryHeadersOffset();
try self.base.file.?.pwriteAll(mem.sliceAsBytes(self.data_directories.items), offset);
}
fn writeHeader(self: *Coff) !void {
const gpa = self.base.allocator;
var buffer = std.ArrayList(u8).init(gpa);
defer buffer.deinit();
const writer = buffer.writer();
try buffer.ensureUnusedCapacity(msdos_stub.len + 8);
try buffer.ensureTotalCapacity(self.getSizeOfHeaders());
writer.writeAll(msdos_stub) catch unreachable;
writer.writeByteNTimes(0, 4) catch unreachable; // align to 8 bytes
writer.writeAll("PE\x00\x00") catch unreachable;
buffer.items[0x3c] = @intCast(u8, msdos_stub.len + 4);
var num_data_directories: u32 = 0;
var size_of_optional_header = switch (self.ptr_width) {
.p32 => @intCast(u32, @sizeOf(coff.OptionalHeaderPE32)),
.p64 => @intCast(u32, @sizeOf(coff.OptionalHeaderPE64)),
} + num_data_directories * @sizeOf(coff.ImageDataDirectory);
var flags = coff.CoffHeaderFlags{
.EXECUTABLE_IMAGE = 1,
.DEBUG_STRIPPED = 1, // TODO
@ -722,17 +726,20 @@ fn writeHeader(self: *Coff) !void {
flags.DLL = 1;
}
const size_of_optional_header = @intCast(
u16,
self.getOptionalHeaderSize() + self.getDataDirectoryHeadersSize() + self.getSectionHeadersSize(),
);
var coff_header = coff.CoffHeader{
.machine = coff.MachineType.fromTargetCpuArch(self.base.options.target.cpu.arch),
.number_of_sections = @intCast(u16, self.sections.slice().len), // TODO what if we prune a section
.time_date_stamp = 0, // TODO
.pointer_to_symbol_table = self.symtab_offset orelse 0,
.number_of_symbols = if (self.symtab_offset) |_| self.getTotalNumberOfSymbols() else 0,
.size_of_optional_header = @intCast(u16, size_of_optional_header),
.pointer_to_symbol_table = 0,
.number_of_symbols = 0,
.size_of_optional_header = size_of_optional_header,
.flags = flags,
};
try buffer.ensureUnusedCapacity(@sizeOf(coff.CoffHeader));
writer.writeAll(mem.asBytes(&coff_header)) catch unreachable;
const dll_flags: coff.DllFlags = .{
@ -742,10 +749,7 @@ fn writeHeader(self: *Coff) !void {
.NX_COMPAT = 1, // We are compatible with Data Execution Prevention
};
const subsystem: coff.Subsystem = .WINDOWS_CUI;
const size_of_headers: u32 = @intCast(
u32,
msdos_stub.len + 8 + size_of_optional_header + self.sections.slice().len * @sizeOf(coff.SectionHeader),
);
const size_of_headers: u32 = @intCast(u32, self.getSizeOfHeaders());
const size_of_image_aligned: u32 = mem.alignForwardGeneric(u32, size_of_headers, default_section_alignment);
const size_of_headers_aligned: u32 = mem.alignForwardGeneric(u32, size_of_headers, default_file_alignment);
const image_base = self.base.options.image_base_override orelse switch (self.base.options.output_mode) {
@ -756,7 +760,6 @@ fn writeHeader(self: *Coff) !void {
switch (self.ptr_width) {
.p32 => {
try buffer.ensureUnusedCapacity(@sizeOf(coff.OptionalHeaderPE32));
var opt_header = coff.OptionalHeaderPE32{
.magic = coff.IMAGE_NT_OPTIONAL_HDR32_MAGIC,
.major_linker_version = 0,
@ -787,12 +790,11 @@ fn writeHeader(self: *Coff) !void {
.size_of_heap_reserve = 0,
.size_of_heap_commit = 0,
.loader_flags = 0,
.number_of_rva_and_sizes = num_data_directories,
.number_of_rva_and_sizes = @intCast(u32, self.data_directories.items.len),
};
writer.writeAll(mem.asBytes(&opt_header)) catch unreachable;
},
.p64 => {
try buffer.ensureUnusedCapacity(@sizeOf(coff.OptionalHeaderPE64));
var opt_header = coff.OptionalHeaderPE64{
.magic = coff.IMAGE_NT_OPTIONAL_HDR64_MAGIC,
.major_linker_version = 0,
@ -822,33 +824,16 @@ fn writeHeader(self: *Coff) !void {
.size_of_heap_reserve = 0,
.size_of_heap_commit = 0,
.loader_flags = 0,
.number_of_rva_and_sizes = num_data_directories,
.number_of_rva_and_sizes = @intCast(u32, self.data_directories.items.len),
};
writer.writeAll(mem.asBytes(&opt_header)) catch unreachable;
},
}
try buffer.ensureUnusedCapacity(num_data_directories * @sizeOf(coff.ImageDataDirectory));
{
var i: usize = 0;
while (i < num_data_directories) : (i += 1) {
writer.writeAll(mem.asBytes(&coff.ImageDataDirectory{
.virtual_address = 0,
.size = 0,
})) catch unreachable;
}
}
try self.base.file.?.pwriteAll(&[_]u8{0}, size_of_headers_aligned);
try self.base.file.?.pwriteAll(buffer.items, 0);
}
fn getTotalNumberOfSymbols(self: Coff) u32 {
_ = self;
// TODO
return 0;
}
pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) {
// TODO https://github.com/ziglang/zig/issues/1284
return math.add(@TypeOf(actual_size), actual_size, actual_size / ideal_factor) catch
@ -856,14 +841,12 @@ pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) {
}
// fn detectAllocCollision(self: *Coff, start: u64, size: u64) ?u64 {
// const small_ptr = self.ptr_width == .p32;
// const ehdr_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Ehdr) else @sizeOf(elf.Elf64_Ehdr);
// if (start < default_header_size)
// return ehdr_size;
// return default_header_size;
// const end = start + padToIdeal(size);
// if (self.shdr_table_offset) |off| {
// if (self.symtab_offset) |off| {
// const shdr_size: u64 = if (small_ptr) @sizeOf(elf.Elf32_Shdr) else @sizeOf(elf.Elf64_Shdr);
// const tight_size = self.sections.items.len * shdr_size;
// const increased_size = padToIdeal(tight_size);
@ -900,26 +883,26 @@ pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) {
// return null;
// }
// pub fn allocatedSize(self: *Coff, start: u64) u64 {
// if (start == 0)
// return 0;
// var min_pos: u64 = std.math.maxInt(u64);
// if (self.shdr_table_offset) |off| {
// if (off > start and off < min_pos) min_pos = off;
// }
// if (self.phdr_table_offset) |off| {
// if (off > start and off < min_pos) min_pos = off;
// }
// for (self.sections.items) |section| {
// if (section.sh_offset <= start) continue;
// if (section.sh_offset < min_pos) min_pos = section.sh_offset;
// }
// for (self.program_headers.items) |program_header| {
// if (program_header.p_offset <= start) continue;
// if (program_header.p_offset < min_pos) min_pos = program_header.p_offset;
// }
// return min_pos - start;
// }
// // pub fn allocatedSize(self: *Coff, start: u64) u64 {
// // if (start == 0)
// // return 0;
// // var min_pos: u64 = std.math.maxInt(u64);
// // if (self.shdr_table_offset) |off| {
// // if (off > start and off < min_pos) min_pos = off;
// // }
// // if (self.phdr_table_offset) |off| {
// // if (off > start and off < min_pos) min_pos = off;
// // }
// // for (self.sections.items) |section| {
// // if (section.sh_offset <= start) continue;
// // if (section.sh_offset < min_pos) min_pos = section.sh_offset;
// // }
// // for (self.program_headers.items) |program_header| {
// // if (program_header.p_offset <= start) continue;
// // if (program_header.p_offset < min_pos) min_pos = program_header.p_offset;
// // }
// // return min_pos - start;
// // }
// pub fn findFreeSpace(self: *Coff, object_size: u64, min_alignment: u32) u64 {
// var start: u64 = 0;
@ -929,12 +912,34 @@ pub fn padToIdeal(actual_size: anytype) @TypeOf(actual_size) {
// return start;
// }
fn getMaxOptionalHeaderSize(self: Coff) usize {
const hdr_size: usize = switch (self.ptr_width) {
inline fn getSizeOfHeaders(self: Coff) usize {
const msdos_hdr_size = msdos_stub.len + 8;
return msdos_hdr_size + @sizeOf(coff.CoffHeader) + self.getOptionalHeaderSize() +
self.getDataDirectoryHeadersSize() + self.getSectionHeadersSize();
}
inline fn getOptionalHeaderSize(self: Coff) usize {
return switch (self.ptr_width) {
.p32 => @sizeOf(coff.OptionalHeaderPE32),
.p64 => @sizeOf(coff.OptionalHeaderPE64),
};
return hdr_size + @sizeOf(coff.ImageDataDirectory) * 16;
}
inline fn getDataDirectoryHeadersSize(self: Coff) usize {
return self.data_directories.items.len * @sizeOf(coff.ImageDataDirectory);
}
inline fn getSectionHeadersSize(self: Coff) usize {
return self.sections.slice().len * @sizeOf(coff.SectionHeader);
}
inline fn getDataDirectoryHeadersOffset(self: Coff) usize {
const msdos_hdr_size = msdos_stub.len + 8;
return msdos_hdr_size + @sizeOf(coff.CoffHeader) + self.getOptionalHeaderSize();
}
inline fn getSectionHeadersOffset(self: Coff) usize {
return self.getDataDirectoryHeadersOffset() + self.getDataDirectoryHeadersSize();
}
/// Returns pointer-to-symbol described by `sym_with_loc` descriptor.