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# Evil Enchantress Elphin
Turns your ELFs into DOLphins using the power of Zig (and CPU cycles).
## License
`AGPL-3.0-only`, check `LICENSE` for full text

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const std = @import("std");
pub fn build(b: *std.Build) void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const dolLib = b.addStaticLibrary(.{
.name = "elphin",
.root_source_file = b.path("src/dol.zig"),
.target = target,
.optimize = optimize,
});
b.installArtifact(dolLib);
const exe = b.addExecutable(.{
.name = "elphin",
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
b.installArtifact(exe);
const run_cmd = b.addRunArtifact(exe);
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
if (b.args) |args| {
run_cmd.addArgs(args);
}
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
}

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.{
.name = "elphin",
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// This field is optional.
// This is currently advisory only; Zig does not yet do anything
// with this value.
//.minimum_zig_version = "0.11.0",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
// // When this is set to `true`, a package is declared to be lazily
// // fetched. This makes the dependency only get fetched if it is
// // actually used.
// .lazy = false,
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package.
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
// This makes *all* files, recursively, included in this package. It is generally
// better to explicitly list the files and directories instead, to insure that
// fetching from tarballs, file system paths, and version control all result
// in the same contents hash.
"",
// For example...
//"build.zig",
//"build.zig.zon",
//"src",
//"LICENSE",
//"README.md",
},
}

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const std = @import("std");
// Cool website for ELF info:
// https://www.man7.org/linux/man-pages/man5/elf.5.html
pub const ELFError = error{
InvalidMagic,
InvalidClass,
InvalidByteOrder,
InvalidIdentVersion,
InvalidVersion,
NotExecutable,
NotPowerPC,
NoEntrypoint,
MissingProgramHeader,
InvalidProgramHeaderEntrySize,
TextSegmentInvalidMemorySize,
TooManyTextSegments,
TooManyDataSegments,
};
const ELFMagic = "\x7fELF";
const ELFClass_32bit = 1;
const ELFDataFormat_BigEndian = 2;
const ELFVersion_Current = 1;
const ELFType_Executable = 2;
const ELFMachine_PowerPC = 20;
const MaximumTextSegments = 7;
const MaximumDataSegments = 11;
const PSFlags_Executable = 1;
const PSFlags_Writable = 2;
const PSFlags_Readable = 4;
const ELFHeader = extern struct {
e_ident: [16]u8,
e_type: u16,
e_machine: u16,
e_version: u32,
e_entry: u32,
e_phoff: u32,
e_shoff: u32,
e_flags: u32,
e_ehsize: u16,
e_phentsize: u16,
e_phnum: u16,
e_shentsize: u16,
e_shnum: u16,
e_shstrndx: u16,
};
const ELFProgramHeader = extern struct {
p_type: u32,
p_offset: u32,
p_vaddr: u32,
p_paddr: u32,
p_filesz: u32,
p_memsz: u32,
p_flags: u32,
p_align: u32,
};
pub const DolHeader = extern struct {
text_off: [7]u32,
data_off: [11]u32,
text_addr: [7]u32,
data_addr: [11]u32,
text_size: [7]u32,
data_size: [11]u32,
bss_addr: u32,
bss_size: u32,
entry: u32,
pad: [7]u32,
};
pub const DolMap = struct {
header: DolHeader,
text_cnt: u32,
data_cnt: u32,
text_elf_off: [7]u32,
data_elf_off: [11]u32,
flags: u32,
};
const DolHasBSS = 1;
pub fn readELF(file: std.fs.File) !DolMap {
// Create dol map
var dolMap = DolMap{
.header = .{
.text_off = .{0} ** 7,
.data_off = .{0} ** 11,
.text_addr = .{0} ** 7,
.data_addr = .{0} ** 11,
.text_size = .{0} ** 7,
.data_size = .{0} ** 11,
.bss_addr = 0,
.bss_size = 0,
.entry = 0,
.pad = .{0} ** 7,
},
.text_cnt = 0,
.data_cnt = 0,
.text_elf_off = undefined,
.data_elf_off = undefined,
.flags = 0,
};
// Read header
const header = try file.reader().readStructEndian(ELFHeader, std.builtin.Endian.big);
try checkELFHeader(header);
// Get entry point
dolMap.header.entry = header.e_entry;
// Read program headers
const phnum = header.e_phnum;
const phoff = header.e_phoff;
// Sanity checks
if (phnum == 0 or phoff == 0) {
return ELFError.MissingProgramHeader;
}
if (header.e_phentsize != @sizeOf(ELFProgramHeader)) {
return ELFError.InvalidProgramHeaderEntrySize;
}
// Read program headers
try file.seekTo(phoff);
for (0..phnum) |_| {
const programHeader = try file.reader().readStructEndian(ELFProgramHeader, std.builtin.Endian.big);
// Skip non-loadable segments
if (programHeader.p_type != 1) {
std.debug.print("Skipping non-loadable segment at 0x{x}\n", .{programHeader.p_vaddr});
continue;
}
// Skip empty segments
if (programHeader.p_memsz == 0) {
std.debug.print("Skipping empty segment at 0x{x}\n", .{programHeader.p_vaddr});
continue;
}
// Check if segment is readable
if (programHeader.p_flags & PSFlags_Readable == 0) {
std.debug.print("Warning: non-readable segment at 0x{x}\n", .{programHeader.p_vaddr});
}
// If the segment is executable, it's a TEXT segment
if (programHeader.p_flags & PSFlags_Executable != 0) {
// Do we have too many text segments?
if (dolMap.text_cnt >= MaximumTextSegments) {
return ELFError.TooManyTextSegments;
}
// Check if segment is writable
if (programHeader.p_flags & PSFlags_Writable != 0) {
std.debug.print("Warning: segment at 0x{x} is both executable and writable\n", .{programHeader.p_vaddr});
}
// Check if segment has valid memory size
if (programHeader.p_filesz > programHeader.p_memsz) {
return ELFError.TextSegmentInvalidMemorySize;
}
// Check if there's leftover space
if (programHeader.p_filesz < programHeader.p_memsz) {
// Add as BSS segment of whatever is left between the file and memory sizes
// TODO: why?!
add_bss(&dolMap, programHeader.p_paddr + programHeader.p_filesz, programHeader.p_memsz - programHeader.p_filesz);
std.debug.print("Found bss segment at 0x{x}\n", .{programHeader.p_paddr + programHeader.p_filesz});
}
std.debug.print("Found text segment at 0x{x}\n", .{programHeader.p_vaddr});
dolMap.header.text_addr[dolMap.text_cnt] = programHeader.p_paddr;
dolMap.header.text_size[dolMap.text_cnt] = programHeader.p_filesz;
dolMap.text_elf_off[dolMap.text_cnt] = programHeader.p_offset;
dolMap.text_cnt += 1;
} else {
// DATA or BSS segment
// TODO: ????
if (programHeader.p_filesz == 0) {
add_bss(&dolMap, programHeader.p_paddr, programHeader.p_memsz);
std.debug.print("Found bss segment at 0x{x}\n", .{programHeader.p_vaddr});
continue;
}
// Do we have too many data segments?
if (dolMap.data_cnt >= MaximumDataSegments) {
return ELFError.TooManyDataSegments;
}
std.debug.print("Found data segment at 0x{x}\n", .{programHeader.p_vaddr});
dolMap.header.data_addr[dolMap.data_cnt] = programHeader.p_paddr;
dolMap.header.data_size[dolMap.data_cnt] = programHeader.p_filesz;
dolMap.data_elf_off[dolMap.data_cnt] = programHeader.p_offset;
dolMap.data_cnt += 1;
}
}
return dolMap;
}
// I don't understand what this does
fn add_bss(map: *DolMap, addr: u32, size: u32) void {
if (map.flags & DolHasBSS != 0) {
const originalAddr = map.header.bss_addr;
const originalSize = map.header.bss_size;
if ((originalAddr + originalSize) == addr) {
map.header.bss_size = originalSize + size;
}
} else {
map.header.bss_addr = addr;
map.header.bss_size = size;
map.flags |= DolHasBSS;
}
}
fn checkELFHeader(header: ELFHeader) !void {
// Check magic
if (!std.mem.eql(u8, header.e_ident[0..4], ELFMagic)) {
return ELFError.InvalidMagic;
}
// Check class
if (header.e_ident[4] != ELFClass_32bit) {
return ELFError.InvalidClass;
}
// Check byte order
if (header.e_ident[5] != ELFDataFormat_BigEndian) {
return ELFError.InvalidByteOrder;
}
// Check ident version
if (header.e_ident[6] != ELFVersion_Current) {
return ELFError.InvalidIdentVersion;
}
// Check version
if (header.e_version != ELFVersion_Current) {
return ELFError.InvalidVersion;
}
// Check type
if (header.e_type != ELFType_Executable) {
return ELFError.NotExecutable;
}
// Check machine
if (header.e_machine != ELFMachine_PowerPC) {
return ELFError.NotPowerPC;
}
// Check entry point
if (header.e_entry == 0) {
return ELFError.NoEntrypoint;
}
}

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const std = @import("std");
const elf = @import("elf.zig");
pub fn main() !void {
// Get allocator
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
defer _ = gpa.deinit();
// Get args
const args = try std.process.argsAlloc(allocator);
defer std.process.argsFree(allocator, args);
if (args.len < 3) {
std.debug.print("Usage: {s} <input.elf> <output.dol>\n", .{args[0]});
std.process.exit(1);
}
const inputPath = args[1];
const outputPath = args[2];
_ = outputPath; // autofix
// Read input
const input = try std.fs.cwd().openFile(inputPath, .{});
_ = try elf.readELF(input);
}