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std.elf: Parse and make available some extra fields on Header.

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Closes #19830.
This commit is contained in:
Alex Rønne Petersen 2024-10-01 03:54:42 +02:00
parent 604ff131dd
commit 9bbfc864af
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1 changed files with 25 additions and 9 deletions
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34
lib/std/elf.zig
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@ -468,9 +468,12 @@ pub const ET = enum(u16) {
/// All integers are native endian.
pub const Header = struct {
endian: std.builtin.Endian,
machine: EM,
is_64: bool,
endian: std.builtin.Endian,
os_abi: OSABI,
abi_version: u8,
type: ET,
machine: EM,
entry: u64,
phoff: u64,
shoff: u64,
@ -507,6 +510,12 @@ pub const Header = struct {
if (!mem.eql(u8, hdr32.e_ident[0..4], MAGIC)) return error.InvalidElfMagic;
if (hdr32.e_ident[EI_VERSION] != 1) return error.InvalidElfVersion;
const is_64 = switch (hdr32.e_ident[EI_CLASS]) {
ELFCLASS32 => false,
ELFCLASS64 => true,
else => return error.InvalidElfClass,
};
const endian: std.builtin.Endian = switch (hdr32.e_ident[EI_DATA]) {
ELFDATA2LSB => .little,
ELFDATA2MSB => .big,
@ -514,11 +523,15 @@ pub const Header = struct {
};
const need_bswap = endian != native_endian;
const is_64 = switch (hdr32.e_ident[EI_CLASS]) {
ELFCLASS32 => false,
ELFCLASS64 => true,
else => return error.InvalidElfClass,
};
const os_abi: OSABI = @enumFromInt(hdr32.e_ident[EI_OSABI]);
// The meaning of this value depends on `os_abi` so just make it available as `u8`.
const abi_version = hdr32.e_ident[EI_ABIVERSION];
const @"type" = if (need_bswap) blk: {
const value = @intFromEnum(hdr32.e_type);
break :blk @as(ET, @enumFromInt(@byteSwap(value)));
} else hdr32.e_type;
const machine = if (need_bswap) blk: {
const value = @intFromEnum(hdr32.e_machine);
@ -526,9 +539,12 @@ pub const Header = struct {
} else hdr32.e_machine;
return @as(Header, .{
.endian = endian,
.machine = machine,
.is_64 = is_64,
.endian = endian,
.os_abi = os_abi,
.abi_version = abi_version,
.type = @"type",
.machine = machine,
.entry = int(is_64, need_bswap, hdr32.e_entry, hdr64.e_entry),
.phoff = int(is_64, need_bswap, hdr32.e_phoff, hdr64.e_phoff),
.shoff = int(is_64, need_bswap, hdr32.e_shoff, hdr64.e_shoff),