refactor things around
This commit is contained in:
parent
81a66e6dc7
commit
2e642f2e4d
GPG key ID:
1669C533B8CF6D89
4 changed files with 202 additions and 166 deletions
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@ -4,15 +4,6 @@ pub fn build(b: *std.Build) void {
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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const dolLib = b.addStaticLibrary(.{
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.name = "elphin",
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.root_source_file = b.path("src/dol.zig"),
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.target = target,
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.optimize = optimize,
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});
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b.installArtifact(dolLib);
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const exe = b.addExecutable(.{
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.name = "elphin",
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.root_source_file = b.path("src/main.zig"),
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128
src/dol.zig
128
src/dol.zig
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@ -0,0 +1,128 @@
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const std = @import("std");
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const elf = @import("elf.zig");
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const oldzig = @import("oldzig.zig");
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pub const MaximumTextSegments = 7;
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pub const MaximumDataSegments = 11;
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pub const DolHeader = extern struct {
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textOffsets: [7]u32,
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dataOffsets: [11]u32,
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textAddress: [7]u32,
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dataAddress: [11]u32,
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textSize: [7]u32,
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dataSize: [11]u32,
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BSSAddress: u32,
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BSSSize: u32,
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entrypoint: u32,
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reserved: [7]u32,
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};
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pub const DolMap = struct {
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header: DolHeader,
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textCount: u32,
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dataCount: u32,
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originalFileTextOffset: [7]u32,
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originalFileDataOffset: [11]u32,
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};
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const DOLAlignment = 64;
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pub fn createDOLMapping(segments: elf.ELFSegments) DolMap {
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// Create dol map
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var dolMap = DolMap{
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.header = .{
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.textOffsets = .{0} ** 7,
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.dataOffsets = .{0} ** 11,
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.textAddress = .{0} ** 7,
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.dataAddress = .{0} ** 11,
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.textSize = .{0} ** 7,
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.dataSize = .{0} ** 11,
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.BSSAddress = segments.bssAddress,
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.BSSSize = segments.bssSize,
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.entrypoint = segments.entryPoint,
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.reserved = .{0} ** 7,
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},
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.textCount = segments.textCount,
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.dataCount = segments.dataCount,
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.originalFileTextOffset = undefined,
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.originalFileDataOffset = undefined,
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};
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// Setup dummy segments if no TEXT or DATA segments are present
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dolMap.header.textOffsets[0] = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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dolMap.header.dataOffsets[0] = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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var currentPosition = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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for (0..segments.textCount) |i| {
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// Set offset to aligned address
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dolMap.header.textOffsets[i] = currentPosition;
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// Copy over text segment info
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dolMap.originalFileTextOffset[i] = segments.text[i].offset;
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dolMap.header.textAddress[i] = segments.text[i].address;
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dolMap.header.textSize[i] = segments.text[i].size;
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// Get next aligned position
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currentPosition = std.mem.alignForward(u32, currentPosition + dolMap.header.textSize[i], DOLAlignment);
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}
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for (0..segments.dataCount) |i| {
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// Set offset to aligned address
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dolMap.header.dataOffsets[i] = currentPosition;
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// Copy over text segment info
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dolMap.originalFileDataOffset[i] = segments.data[i].offset;
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dolMap.header.dataAddress[i] = segments.data[i].address;
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dolMap.header.dataSize[i] = segments.data[i].size;
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// Get next aligned position
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currentPosition = std.mem.alignForward(u32, currentPosition + dolMap.header.dataSize[i], DOLAlignment);
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}
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return dolMap;
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}
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pub fn writeDOL(map: DolMap, input: std.fs.File, output: std.fs.File) !void {
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const reader = input.reader();
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const writer = output.writer();
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// Write header
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try oldzig.writeStructEndian(writer, map.header, std.builtin.Endian.big);
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// Create buffer for pump
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var fifo = std.fifo.LinearFifo(u8, .{ .Static = 1024 * 1024 }).init();
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defer fifo.deinit();
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// Copy over text segments
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for (0..map.textCount) |i| {
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// Seek to text segment
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try input.seekTo(map.originalFileTextOffset[i]);
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// Create limited reader to segment size
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var limitedReader = std.io.limitedReader(reader, map.header.textSize[i]);
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// Seek to destination
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try output.seekTo(map.header.textOffsets[i]);
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// Copy segment
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std.log.debug("Copying text segment {d} at 0x{x} -> 0x{x}", .{ i, map.header.textAddress[i], map.header.textOffsets[i] });
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try fifo.pump(&limitedReader, writer);
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}
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// Copy over data segments
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for (0..map.dataCount) |i| {
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// Seek to data segment
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try input.seekTo(map.originalFileDataOffset[i]);
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// Create limited reader to segment size
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var limitedReader = std.io.limitedReader(reader, map.header.dataSize[i]);
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// Seek to destination
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try output.seekTo(map.header.dataOffsets[i]);
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// Copy segment
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std.log.debug("Copying data segment {d} at 0x{x} -> 0x{x}", .{ i, map.header.dataAddress[i], map.header.dataOffsets[i] });
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try fifo.pump(&limitedReader, writer);
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}
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}
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222
src/elf.zig
222
src/elf.zig
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@ -1,5 +1,5 @@
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const std = @import("std");
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const oldzig = @import("oldzig.zig");
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const dol = @import("dol.zig");
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// Cool website for ELF info:
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// https://www.man7.org/linux/man-pages/man5/elf.5.html
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@ -27,9 +27,6 @@ const ELFVersion_Current = 1;
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const ELFType_Executable = 2;
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const ELFMachine_PowerPC = 20;
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const MaximumTextSegments = 7;
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const MaximumDataSegments = 11;
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const PSFlags_Executable = 1;
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const PSFlags_Writable = 2;
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const PSFlags_Readable = 4;
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@ -62,51 +59,36 @@ const ELFProgramHeader = extern struct {
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p_align: u32,
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};
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pub const DolHeader = extern struct {
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text_off: [7]u32,
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data_off: [11]u32,
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text_addr: [7]u32,
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data_addr: [11]u32,
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text_size: [7]u32,
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data_size: [11]u32,
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bss_addr: u32,
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bss_size: u32,
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entry: u32,
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pad: [7]u32,
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};
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pub const DolMap = struct {
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header: DolHeader,
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text_cnt: u32,
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data_cnt: u32,
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text_elf_off: [7]u32,
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data_elf_off: [11]u32,
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flags: u32,
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};
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const DolHasBSS = 1;
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pub fn readELF(file: std.fs.File) !DolMap {
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pub const SegmentInfo = struct {
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offset: u32,
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size: u32,
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address: u32,
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};
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// Create dol map
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var dolMap = DolMap{
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.header = .{
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.text_off = .{0} ** 7,
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.data_off = .{0} ** 11,
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.text_addr = .{0} ** 7,
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.data_addr = .{0} ** 11,
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.text_size = .{0} ** 7,
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.data_size = .{0} ** 11,
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.bss_addr = 0,
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.bss_size = 0,
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.entry = 0,
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.pad = .{0} ** 7,
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},
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.text_cnt = 0,
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.data_cnt = 0,
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.text_elf_off = undefined,
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.data_elf_off = undefined,
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.flags = 0,
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pub const ELFSegments = struct {
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entryPoint: u32,
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textCount: u4,
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text: [dol.MaximumTextSegments]SegmentInfo,
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dataCount: u4,
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data: [dol.MaximumDataSegments]SegmentInfo,
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hasBSS: bool,
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bssAddress: u32,
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bssSize: u32,
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};
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pub fn readELF(file: std.fs.File) !ELFSegments {
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// Create segment map
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var elfMap: ELFSegments = .{
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.entryPoint = undefined,
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.textCount = 0,
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.text = undefined,
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.dataCount = 0,
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.data = undefined,
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.hasBSS = false,
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.bssAddress = 0,
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.bssSize = 0,
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};
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// Read header
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@ -116,14 +98,14 @@ pub fn readELF(file: std.fs.File) !DolMap {
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try checkELFHeader(header);
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// Get entry point
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dolMap.header.entry = header.e_entry;
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elfMap.entryPoint = header.e_entry;
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// Read program headers
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const phnum = header.e_phnum;
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const phoff = header.e_phoff;
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const programCount = header.e_phnum;
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const programOffset = header.e_phoff;
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// Sanity checks
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if (phnum == 0 or phoff == 0) {
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if (programCount == 0 or programOffset == 0) {
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return ELFError.MissingProgramHeader;
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}
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if (header.e_phentsize != @sizeOf(ELFProgramHeader)) {
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@ -131,38 +113,38 @@ pub fn readELF(file: std.fs.File) !DolMap {
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}
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// Read program headers
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try file.seekTo(phoff);
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try file.seekTo(programOffset);
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for (0..phnum) |_| {
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for (0..programCount) |_| {
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const programHeader = try reader.readStructEndian(ELFProgramHeader, std.builtin.Endian.big);
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// Skip non-loadable segments
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if (programHeader.p_type != 1) {
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std.debug.print("Skipping non-loadable segment at 0x{x}\n", .{programHeader.p_vaddr});
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std.log.debug("Skipping non-loadable segment at 0x{x}", .{programHeader.p_vaddr});
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continue;
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}
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// Skip empty segments
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if (programHeader.p_memsz == 0) {
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std.debug.print("Skipping empty segment at 0x{x}\n", .{programHeader.p_vaddr});
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std.log.debug("Skipping empty segment at 0x{x}", .{programHeader.p_vaddr});
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continue;
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}
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// Check if segment is readable
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if (programHeader.p_flags & PSFlags_Readable == 0) {
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std.debug.print("Warning: non-readable segment at 0x{x}\n", .{programHeader.p_vaddr});
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std.log.debug("Warning: non-readable segment at 0x{x}", .{programHeader.p_vaddr});
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}
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// If the segment is executable, it's a TEXT segment
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if (programHeader.p_flags & PSFlags_Executable != 0) {
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// Do we have too many text segments?
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if (dolMap.text_cnt >= MaximumTextSegments) {
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if (elfMap.textCount >= dol.MaximumTextSegments) {
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return ELFError.TooManyTextSegments;
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}
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// Check if segment is writable
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if (programHeader.p_flags & PSFlags_Writable != 0) {
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std.debug.print("Warning: segment at 0x{x} is both executable and writable\n", .{programHeader.p_vaddr});
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std.log.debug("Warning: segment at 0x{x} is both executable and writable", .{programHeader.p_vaddr});
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}
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// Check if segment has valid memory size
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@ -173,129 +155,63 @@ pub fn readELF(file: std.fs.File) !DolMap {
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// Check if there's leftover space
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if (programHeader.p_filesz < programHeader.p_memsz) {
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// Add as BSS segment of whatever is left between the file and memory sizes
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// TODO: why?!
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add_bss(&dolMap, programHeader.p_paddr + programHeader.p_filesz, programHeader.p_memsz - programHeader.p_filesz);
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std.debug.print("Found bss segment (TEXT) at 0x{x}\n", .{programHeader.p_paddr + programHeader.p_filesz});
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addOrExtendBSS(&elfMap, programHeader.p_paddr + programHeader.p_filesz, programHeader.p_memsz - programHeader.p_filesz);
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std.log.debug("Found bss segment (TEXT) at 0x{x}", .{programHeader.p_paddr + programHeader.p_filesz});
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}
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std.debug.print("Found text segment at 0x{x}\n", .{programHeader.p_vaddr});
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std.log.debug("Found text segment at 0x{x}", .{programHeader.p_vaddr});
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dolMap.header.text_addr[dolMap.text_cnt] = programHeader.p_paddr;
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dolMap.header.text_size[dolMap.text_cnt] = programHeader.p_filesz;
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dolMap.text_elf_off[dolMap.text_cnt] = programHeader.p_offset;
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elfMap.text[elfMap.textCount] = .{
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.address = programHeader.p_paddr,
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.size = programHeader.p_filesz,
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.offset = programHeader.p_offset,
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};
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dolMap.text_cnt += 1;
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elfMap.textCount += 1;
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} else {
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// DATA or BSS segment
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// TODO: ????
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if (programHeader.p_filesz == 0) {
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add_bss(&dolMap, programHeader.p_paddr, programHeader.p_memsz);
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std.debug.print("Found bss segment (DATA) at 0x{x}\n", .{programHeader.p_vaddr});
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addOrExtendBSS(&elfMap, programHeader.p_paddr, programHeader.p_memsz);
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std.log.debug("Found bss segment (DATA) at 0x{x}", .{programHeader.p_vaddr});
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continue;
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}
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// Do we have too many data segments?
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if (dolMap.data_cnt >= MaximumDataSegments) {
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if (elfMap.dataCount >= dol.MaximumDataSegments) {
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return ELFError.TooManyDataSegments;
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}
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std.debug.print("Found data segment at 0x{x}\n", .{programHeader.p_vaddr});
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std.log.debug("Found data segment at 0x{x}", .{programHeader.p_vaddr});
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dolMap.header.data_addr[dolMap.data_cnt] = programHeader.p_paddr;
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dolMap.header.data_size[dolMap.data_cnt] = programHeader.p_filesz;
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dolMap.data_elf_off[dolMap.data_cnt] = programHeader.p_offset;
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elfMap.data[elfMap.dataCount] = .{
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.address = programHeader.p_paddr,
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.size = programHeader.p_filesz,
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.offset = programHeader.p_offset,
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};
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dolMap.data_cnt += 1;
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elfMap.dataCount += 1;
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}
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}
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return dolMap;
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return elfMap;
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}
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// I don't understand what this does
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fn add_bss(map: *DolMap, addr: u32, size: u32) void {
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if (map.flags & DolHasBSS != 0) {
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const originalAddr = map.header.bss_addr;
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const originalSize = map.header.bss_size;
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fn addOrExtendBSS(map: *ELFSegments, addr: u32, size: u32) void {
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// If we already have a BSS segment and it lines up, extend it
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if (map.hasBSS) {
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const originalAddr = map.bssAddress;
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const originalSize = map.bssSize;
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if ((originalAddr + originalSize) == addr) {
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map.header.bss_size = originalSize + size;
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}
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} else {
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map.header.bss_addr = addr;
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map.header.bss_size = size;
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map.flags |= DolHasBSS;
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map.bssSize = originalSize + size;
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}
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return;
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}
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const DOLAlignment = 64;
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pub fn alignSegments(map: *DolMap) void {
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std.debug.print("Mapping DOL to 64 byte alignment\n", .{});
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var currentPosition = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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for (0..map.text_cnt) |i| {
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std.debug.print(" - Mapping text segment {d} at 0x{x} -> 0x{x}\n", .{ i, map.header.text_addr[i], currentPosition });
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map.header.text_off[i] = currentPosition;
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currentPosition = std.mem.alignForward(u32, currentPosition + map.header.text_size[i], DOLAlignment);
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}
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for (0..map.data_cnt) |i| {
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std.debug.print(" - Mapping data segment {d} at 0x{x} -> 0x{x}\n", .{ i, map.header.data_addr[i], currentPosition });
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map.header.data_off[i] = currentPosition;
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currentPosition = std.mem.alignForward(u32, currentPosition + map.header.data_size[i], DOLAlignment);
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}
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// Add dummy segments if no TEXT or DATA segments are present
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if (map.text_cnt == 0) {
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map.header.text_off[0] = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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}
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if (map.data_cnt == 0) {
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map.header.data_off[0] = std.mem.alignForward(u32, @sizeOf(DolHeader), DOLAlignment);
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}
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}
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pub fn writeDOL(map: DolMap, input: std.fs.File, output: std.fs.File) !void {
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const reader = input.reader();
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const writer = output.writer();
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// Write header
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try oldzig.writeStructEndian(writer, map.header, std.builtin.Endian.big);
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// Create buffer for pump
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var fifo = std.fifo.LinearFifo(u8, .{ .Static = 1024 * 1024 }).init();
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defer fifo.deinit();
|
||||
|
||||
// Copy over text segments
|
||||
for (0..map.text_cnt) |i| {
|
||||
// Seek to text segment
|
||||
try input.seekTo(map.text_elf_off[i]);
|
||||
|
||||
// Create limited reader to segment size
|
||||
var limitedReader = std.io.limitedReader(reader, map.header.text_size[i]);
|
||||
|
||||
// Seek to destination
|
||||
try output.seekTo(map.header.text_off[i]);
|
||||
|
||||
// Copy segment
|
||||
std.debug.print("Copying text segment {d} at 0x{x} -> 0x{x}\n", .{ i, map.header.text_addr[i], map.header.text_off[i] });
|
||||
try fifo.pump(&limitedReader, writer);
|
||||
}
|
||||
|
||||
// Copy over data segments
|
||||
for (0..map.data_cnt) |i| {
|
||||
// Seek to data segment
|
||||
try input.seekTo(map.data_elf_off[i]);
|
||||
|
||||
// Create limited reader to segment size
|
||||
var limitedReader = std.io.limitedReader(reader, map.header.data_size[i]);
|
||||
|
||||
// Seek to destination
|
||||
try output.seekTo(map.header.data_off[i]);
|
||||
|
||||
// Copy segment
|
||||
std.debug.print("Copying data segment {d} at 0x{x} -> 0x{x}\n", .{ i, map.header.data_addr[i], map.header.data_off[i] });
|
||||
try fifo.pump(&limitedReader, writer);
|
||||
}
|
||||
map.bssAddress = addr;
|
||||
map.bssSize = size;
|
||||
map.hasBSS = true;
|
||||
}
|
||||
|
||||
fn checkELFHeader(header: ELFHeader) !void {
|
||||
|
|
|
|||
|
|
@ -1,5 +1,6 @@
|
|||
const std = @import("std");
|
||||
const elf = @import("elf.zig");
|
||||
const dol = @import("dol.zig");
|
||||
|
||||
pub fn main() !void {
|
||||
// Get allocator
|
||||
|
|
@ -12,7 +13,7 @@ pub fn main() !void {
|
|||
defer std.process.argsFree(allocator, args);
|
||||
|
||||
if (args.len < 3) {
|
||||
std.debug.print("Usage: {s} <input.elf> <output.dol>\n", .{args[0]});
|
||||
std.log.err("Usage: {s} <input.elf> <output.dol>", .{args[0]});
|
||||
std.process.exit(1);
|
||||
}
|
||||
|
||||
|
|
@ -22,13 +23,13 @@ pub fn main() !void {
|
|||
// Read input
|
||||
const input = try std.fs.cwd().openFile(inputPath, .{});
|
||||
defer input.close();
|
||||
var map = try elf.readELF(input);
|
||||
const map = try elf.readELF(input);
|
||||
|
||||
// Align segments to 64 byte boundaries
|
||||
elf.alignSegments(&map);
|
||||
const dolMap = dol.createDOLMapping(map);
|
||||
|
||||
// Write header and copy over segments from input
|
||||
const output = try std.fs.cwd().createFile(outputPath, .{});
|
||||
defer output.close();
|
||||
try elf.writeDOL(map, input, output);
|
||||
try dol.writeDOL(dolMap, input, output);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue