From ddf0fa0f696cd74c932427493c099aa71b40c748 Mon Sep 17 00:00:00 2001 From: Hamcha Date: Sun, 5 May 2024 13:57:35 +0200 Subject: [PATCH] here you go zero --- .gitignore | 4 + LICENSE | 661 ++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 7 + build.zig | 35 +++ build.zig.zon | 67 +++++ src/dol.zig | 0 src/elf.zig | 268 ++++++++++++++++++++ src/main.zig | 27 +++ 8 files changed, 1069 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 README.md create mode 100644 build.zig create mode 100644 build.zig.zon create mode 100644 src/dol.zig create mode 100644 src/elf.zig create mode 100644 src/main.zig diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..5a45e20 --- /dev/null +++ b/.gitignore @@ -0,0 +1,4 @@ +zig-cache +zig-out +*.elf +*.dol \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..bae94e1 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..13a61f8 --- /dev/null +++ b/README.md @@ -0,0 +1,7 @@ +# 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 \ No newline at end of file diff --git a/build.zig b/build.zig new file mode 100644 index 0000000..5baac6d --- /dev/null +++ b/build.zig @@ -0,0 +1,35 @@ +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); +} diff --git a/build.zig.zon b/build.zig.zon new file mode 100644 index 0000000..904681d --- /dev/null +++ b/build.zig.zon @@ -0,0 +1,67 @@ +.{ + .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 ` 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", + }, +} diff --git a/src/dol.zig b/src/dol.zig new file mode 100644 index 0000000..e69de29 diff --git a/src/elf.zig b/src/elf.zig new file mode 100644 index 0000000..0d5ffdc --- /dev/null +++ b/src/elf.zig @@ -0,0 +1,268 @@ +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; + } +} diff --git a/src/main.zig b/src/main.zig new file mode 100644 index 0000000..22c71a3 --- /dev/null +++ b/src/main.zig @@ -0,0 +1,27 @@ +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} \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); +}