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//! ELF parser
const elf_const = @import("../../common/constants/elf.zig");
const system = @import("../../system/system.zig");
const types = @import("types.zig");
pub fn parse(data: []const u8) !types.Info {
if (data.len < @sizeOf(types.Header)) {
return error.TooSmall;
}
const header = @as(*const types.Header, @ptrCast(@alignCast(data.ptr)));
if (header.magic[0] != elf_const.MAGIC[0] or
header.magic[1] != elf_const.MAGIC[1] or
header.magic[2] != elf_const.MAGIC[2] or
header.magic[3] != elf_const.MAGIC[3])
{
return error.InvalidMagic;
}
if (header.class != elf_const.CLASS_64) {
return error.Not64Bit;
}
if (header.data != elf_const.DATA_LSB) {
return error.NotLittleEndian;
}
if (header.type != elf_const.TYPE_EXEC and header.type != elf_const.TYPE_DYN) {
return error.NotExecutable;
}
if (!system.is_valid_user_pointer(header.entry)) {
return error.InvalidEntryPoint;
}
if (header.phnum == 0) {
return error.NoProgramHeaders;
}
if (header.phentsize != @sizeOf(types.ProgramHeader)) {
return error.InvalidProgramHeaderSize;
}
const ph_table_size = @as(u64, header.phnum) * @as(u64, header.phentsize);
if (header.phoff + ph_table_size > data.len) {
return error.InvalidProgramHeaders;
}
const ph_start = data.ptr + header.phoff;
const ph_ptr: [*]const types.ProgramHeader = @ptrCast(@alignCast(ph_start));
const program_headers = ph_ptr[0..header.phnum];
for (program_headers) |phdr| {
if (phdr.type == elf_const.PT_LOAD) {
if (phdr.offset + phdr.filesz > data.len) {
return error.SegmentOutOfBounds;
}
if (phdr.filesz > phdr.memsz) {
return error.InvalidSegmentSize;
}
if (!system.is_userspace_range(phdr.vaddr, phdr.memsz)) {
return error.SegmentAddressOutOfRange;
}
}
}
return types.Info{
.entry_point = header.entry,
.program_headers = program_headers,
};
}
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