Write PE section table
This commit is contained in:
Alexandros Naskos
parent
fac9a4e286
commit
fe0ad8d6e9
@ -1,6 +1,7 @@
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const Coff = @This();
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const std = @import("std");
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const log = std.log.scoped(.link);
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const Allocator = std.mem.Allocator;
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const assert = std.debug.assert;
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const fs = std.fs;
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@ -9,12 +10,9 @@ const Module = @import("../Module.zig");
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const codegen = @import("../codegen/wasm.zig");
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const link = @import("../link.zig");
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pub const base_tag: link.File.Tag = .coff;
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const msdos_stub = @embedFile("msdos-stub.bin");
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const coff_file_header_offset = msdos_stub.len + 4;
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const optional_header_offset = coff_file_header_offset + 20;
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base: link.File,
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ptr_width: enum { p32, p64 },
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@ -70,8 +68,7 @@ fn openFile(allocator: *Allocator, file: fs.File, options: link.Options) !Coff {
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/// Returns an error if `file` is not already open with +read +write +seek abilities.
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fn createFile(allocator: *Allocator, file: fs.File, options: link.Options) !Coff {
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switch (options.output_mode) {
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.Exe => {},
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.Obj => return error.TODOImplementWritingObjFiles, // @TODO DO OBJ FILES
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.Exe, .Obj => {},
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.Lib => return error.TODOImplementWritingLibFiles,
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}
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var self: Coff = .{
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@ -91,10 +88,19 @@ fn createFile(allocator: *Allocator, file: fs.File, options: link.Options) !Coff
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};
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errdefer self.deinit();
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var output = self.base.file.?.writer();
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var coff_file_header_offset: u32 = 0;
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if (options.output_mode == .Exe) {
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// Write the MS-DOS stub and the PE signature
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try self.base.file.?.pwriteAll(msdos_stub ++ "PE\x00\x00", 0);
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coff_file_header_offset = msdos_stub.len + 4;
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}
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// MS-DOS stub + PE magic
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try output.writeAll(msdos_stub ++ "PE\x00\x00");
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// COFF file header
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const data_directory_count = 0;
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var hdr_data: [112 + data_directory_count * 8 + 2 * 40]u8 = undefined;
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var index: usize = 0;
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// @TODO Add an enum(u16) in std.coff, add .toCoffMachine to Arch
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const machine_type: u16 = switch (self.base.options.target.cpu.arch) {
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.x86_64 => 0x8664,
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.i386 => 0x014c,
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@ -102,97 +108,185 @@ fn createFile(allocator: *Allocator, file: fs.File, options: link.Options) !Coff
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.riscv64 => 0x5064,
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else => return error.UnsupportedCOFFArchitecture,
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};
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std.mem.writeIntLittle(u16, hdr_data[0..2], machine_type);
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index += 2;
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// Start of COFF file header
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try output.writeIntLittle(u16, machine_type);
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try output.writeIntLittle(u16, switch (self.ptr_width) {
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.p32 => @as(u16, 98),
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.p64 => 114,
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});
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try output.writeAll("\x00" ** 14);
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// Characteristics - IMAGE_FILE_RELOCS_STRIPPED | IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_DEBUG_STRIPPED
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var characteristics: u16 = 0x0001 | 0x000 | 0x02002; // @TODO Remove debug info stripped flag when necessary
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// Number of sections (we only use .got, .text)
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 2);
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index += 2;
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// TimeDateStamp (u32), PointerToSymbolTable (u32), NumberOfSymbols (u32)
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std.mem.set(u8, hdr_data[index..][0..12], 0);
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index += 12;
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const optional_header_size = switch (options.output_mode) {
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.Exe => data_directory_count * 8 + switch (self.ptr_width) {
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.p32 => @as(u16, 96),
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.p64 => 112,
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},
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else => 0,
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};
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], optional_header_size);
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index += 2;
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// Characteristics - IMAGE_FILE_DEBUG_STRIPPED
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var characteristics: u16 = 0x200; // TODO Remove debug info stripped flag when necessary
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if (options.output_mode == .Exe) {
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// IMAGE_FILE_EXECUTABLE_IMAGE
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characteristics |= 0x2;
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}
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switch (self.ptr_width) {
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// IMAGE_FILE_32BIT_MACHINE
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.p32 => characteristics |= 0x0100,
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.p32 => characteristics |= 0x100,
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// IMAGE_FILE_LARGE_ADDRESS_AWARE
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.p64 => characteristics |= 0x0020,
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.p64 => characteristics |= 0x20,
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}
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try output.writeIntLittle(u16, characteristics);
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try output.writeIntLittle(u16, switch (self.ptr_width) {
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], characteristics);
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index += 2;
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assert(index == 20);
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try self.base.file.?.pwriteAll(hdr_data[0..index], coff_file_header_offset);
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if (options.output_mode == .Exe) {
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// Optional header
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index = 0;
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std.mem.writeIntLittle(u16, hdr_data[0..2], switch (self.ptr_width) {
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.p32 => @as(u16, 0x10b),
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.p64 => 0x20b,
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});
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index += 2;
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// Linker version (u8 + u8), SizeOfCode (u32), SizeOfInitializedData (u32), SizeOfUninitializedData (u32), AddressOfEntryPoint (u32)
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std.mem.set(u8, hdr_data[index..][0..18], 0);
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index += 18;
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// Base of code relative to the image base
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// @TODO Check where to put this
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x1000);
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index += 4;
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if (self.ptr_width == .p32) {
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// Base of data relative to the image base
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std.mem.set(u8, hdr_data[index..][0..4], 0);
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index += 4;
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// Image base address
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x400_000);
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index += 4;
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} else {
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// Image base address
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std.mem.writeIntLittle(u64, hdr_data[index..][0..8], 0x140_000_000);
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index += 8;
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}
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// Section alignment
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 4096);
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index += 4;
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// File alignment
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 512);
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index += 4;
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// Required OS version, 6.0 is vista
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 6);
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index += 2;
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 0);
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index += 2;
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// Image version
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std.mem.set(u8, hdr_data[index..][0..4], 0);
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index += 4;
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// Required subsystem version, same as OS version
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 6);
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index += 2;
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 0);
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index += 2;
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// Reserved zeroes (u32), SizeOfImage (u32), SizeOfHeaders (u32), CheckSum (u32)
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std.mem.set(u8, hdr_data[index..][0..16], 0);
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index += 16;
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// Subsystem, TODO: Let users specify the subsystem, always CUI for now
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 3);
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index += 2;
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// DLL characteristics, TODO: For now we are just using IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
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std.mem.writeIntLittle(u16, hdr_data[index..][0..2], 0x40);
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index += 2;
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// Start of optional header
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// TODO Linker version, use 0.0 for now.
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try output.writeAll("\x00" ** 2);
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// Zero out every field until "BaseOfCode"
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// @TODO Actually write entry point address, base of code address
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try output.writeAll("\x00" ** 20);
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switch (self.ptr_width) {
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.p32 => {
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// Zero out base of data
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try output.writeAll("\x00" ** 4);
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// Write image base
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try output.writeIntLittle(u32, 0x40000000);
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// @TODO See llvm output for 32 bit executables
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// Size of stack reserve + commit
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x1_000_000);
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index += 4;
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x1_000);
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index += 4;
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// Size of heap reserve + commit
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x100_000);
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index += 4;
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x1_000);
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index += 4;
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},
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.p64 => {
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// Write image base
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try output.writeIntLittle(u64, 0x40000000);
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// Size of stack reserve + commit
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std.mem.writeIntLittle(u64, hdr_data[index..][0..8], 0x1_000_000);
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index += 8;
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std.mem.writeIntLittle(u64, hdr_data[index..][0..8], 0x1_000);
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index += 8;
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// Size of heap reserve + commit
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std.mem.writeIntLittle(u64, hdr_data[index..][0..8], 0x100_000);
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index += 8;
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std.mem.writeIntLittle(u64, hdr_data[index..][0..8], 0x1_000);
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index += 8;
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},
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}
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// Section alignment - default to 256
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try output.writeIntLittle(u32, 256);
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// File alignment - default to 512
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try output.writeIntLittle(u32, 512);
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// TODO - Minimum required windows version - use 6.0 (aka vista for now)
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try output.writeIntLittle(u16, 0x6);
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try output.writeIntLittle(u16, 0x0);
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// TODO - Image version - use 0.0 for now
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try output.writeIntLittle(u32, 0x0);
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// Subsystem version
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try output.writeIntLittle(u16, 0x6);
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try output.writeIntLittle(u16, 0x0);
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// Reserved zeroes
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try output.writeIntLittle(u32, 0x0);
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// Size of image - initialize to zero
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try output.writeIntLittle(u32, 0x0);
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// @TODO Size of headers - calculate this.
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try output.writeIntLittle(u32, 0x0);
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// Checksum
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try output.writeIntLittle(u32, 0x0);
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// Subsystem
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try output.writeIntLittle(u16, 0x3);
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// @TODO Dll characteristics, just using a value from a LLVM produced executable for now.
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try output.writeIntLittle(u16, 0x8160);
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switch (self.ptr_width) {
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.p32 => {
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// Stack reserve
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try output.writeIntLittle(u32, 0x1000000);
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// Stack commit
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try output.writeIntLittle(u32, 0x1000);
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// Heap reserve
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try output.writeIntLittle(u32, 0x100000);
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// Heap commit
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try output.writeIntLittle(u32, 0x100);
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},
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.p64 => {
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// Stack reserve
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try output.writeIntLittle(u64, 0x1000000);
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// Stack commit
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try output.writeIntLittle(u64, 0x1000);
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// Heap reserve
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try output.writeIntLittle(u64, 0x100000);
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// Heap commit
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try output.writeIntLittle(u64, 0x100);
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},
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std.mem.set(u8, hdr_data[index..][0..4], 0);
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index += 4;
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// Number of data directories
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], data_directory_count);
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index += 4;
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// @TODO Write meaningful stuff here
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// Initialize data directories to zero
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std.mem.set(u8, hdr_data[index..][0..data_directory_count * 8], 0);
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index += data_directory_count * 8;
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assert(index == optional_header_size);
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}
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// Reserved loader flags
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try output.writeIntLittle(u32, 0x0);
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// Number of RVA + sizes
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try output.writeIntLittle(u32, 0x0);
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// @TODO Merge this write with the one above
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const section_table_offset = coff_file_header_offset + 20 + optional_header_size;
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// Write section table.
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// First, the .got section
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hdr_data[index..][0..8].* = ".got\x00\x00\x00\x00".*;
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index += 8;
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// Virtual size (u32) (@TODO Set to initial value in image files, zero otherwise), Virtual address (u32) (@TODO Set to value in image files, zero otherwise), Size of raw data (u32)
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std.mem.set(u8, hdr_data[index..][0..12], 0);
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index += 12;
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// File pointer to the start of the section
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], section_table_offset + 2 * 40);
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index += 4;
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// Pointer to relocations (u32) (@TODO Initialize this for object files), PointerToLinenumbers (u32), NumberOfRelocations (u16), (@TODO Initialize this for object files), NumberOfLinenumbers (u16)
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std.mem.set(u8, hdr_data[index..][0..12], 0);
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index += 12;
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// Characteristics `IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ = 0x40000040`
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0x40000040);
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index += 4;
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// Then, the .text section
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hdr_data[index..][0..8].* = ".text\x00\x00\x00".*;
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index += 8;
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// Virtual size (u32) (@TODO Set to initial value in image files, zero otherwise), Virtual address (u32) (@TODO Set to value in image files, zero otherwise), Size of raw data (u32)
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std.mem.set(u8, hdr_data[index..][0..12], 0);
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index += 12;
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// File pointer to the start of the section (@TODO Add the initial size of .got)
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], section_table_offset + 2 * 40);
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index += 4;
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// Pointer to relocations (u32) (@TODO Initialize this for object files), PointerToLinenumbers (u32), NumberOfRelocations (u16), (@TODO Initialize this for object files), NumberOfLinenumbers (u16)
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std.mem.set(u8, hdr_data[index..][0..12], 0);
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index += 12;
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// Characteristics `IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_WRITE = 0xE0000020`
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std.mem.writeIntLittle(u32, hdr_data[index..][0..4], 0xE0000020);
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index += 4;
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assert(index == optional_header_size + 2 * 40);
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try self.base.file.?.pwriteAll(hdr_data[0..index], coff_file_header_offset + 20);
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return self;
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}
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