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CheckObject: support parsing and dumping archive symtab for ELF

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This commit is contained in:
Jakub Konka
2023-11-06 21:17:06 +01:00
parent 6490e2ed82
commit 261db02018
5 changed files with 679 additions and 438 deletions
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847
lib/std/Build/Step/CheckObject.zig
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@@ -405,6 +405,17 @@ pub fn checkInDynamicSection(self: *CheckObject) void {
self.checkExact(label);
}
/// Creates a new check checking specifically symbol table parsed and dumped from the archive
/// file.
pub fn checkInArchiveSymtab(self: *CheckObject) void {
const label = switch (self.obj_format) {
.elf => ElfDumper.archive_symtab_label,
else => @panic("TODO other file formats"),
};
self.checkStart();
self.checkExact(label);
}
/// Creates a new standalone, singular check which allows running simple binary operations
/// on the extracted variables. It will then compare the reduced program with the value of
/// the expected variable.
@@ -884,35 +895,177 @@ const ElfDumper = struct {
const symtab_label = "symbol table";
const dynamic_symtab_label = "dynamic symbol table";
const dynamic_section_label = "dynamic section";
const Symtab = struct {
symbols: []align(1) const elf.Elf64_Sym,
strings: []const u8,
fn get(st: Symtab, index: usize) ?elf.Elf64_Sym {
if (index >= st.symbols.len) return null;
return st.symbols[index];
}
fn getName(st: Symtab, index: usize) ?[]const u8 {
const sym = st.get(index) orelse return null;
return getString(st.strings, sym.st_name);
}
};
const Context = struct {
gpa: Allocator,
data: []const u8,
hdr: elf.Elf64_Ehdr,
shdrs: []align(1) const elf.Elf64_Shdr,
phdrs: []align(1) const elf.Elf64_Phdr,
shstrtab: []const u8,
symtab: ?Symtab = null,
dysymtab: ?Symtab = null,
};
const archive_symtab_label = "archive symbol table";
fn parseAndDump(step: *Step, bytes: []const u8) ![]const u8 {
const gpa = step.owner.allocator;
return parseAndDumpArchive(gpa, bytes) catch |err| switch (err) {
error.InvalidArchiveMagicNumber => try parseAndDumpObject(gpa, bytes),
else => |e| return e,
};
}
fn parseAndDumpArchive(gpa: Allocator, bytes: []const u8) ![]const u8 {
var stream = std.io.fixedBufferStream(bytes);
const reader = stream.reader();
const magic = try reader.readBytesNoEof(elf.ARMAG.len);
if (!mem.eql(u8, &magic, elf.ARMAG)) {
return error.InvalidArchiveMagicNumber;
}
var ctx = ArchiveContext{
.gpa = gpa,
.data = bytes,
.strtab = &[0]u8{},
};
defer {
for (ctx.objects.items) |*object| {
gpa.free(object.name);
}
ctx.objects.deinit(gpa);
}
while (true) {
if (stream.pos >= ctx.data.len) break;
if (!mem.isAligned(stream.pos, 2)) stream.pos += 1;
const hdr = try reader.readStruct(elf.ar_hdr);
if (!mem.eql(u8, &hdr.ar_fmag, elf.ARFMAG)) return error.InvalidArchiveHeaderMagicNumber;
const size = try hdr.size();
defer {
_ = stream.seekBy(size) catch {};
}
if (hdr.isSymtab()) {
try ctx.parseSymtab(ctx.data[stream.pos..][0..size], .p32);
continue;
}
if (hdr.isSymtab64()) {
try ctx.parseSymtab(ctx.data[stream.pos..][0..size], .p64);
continue;
}
if (hdr.isStrtab()) {
ctx.strtab = ctx.data[stream.pos..][0..size];
continue;
}
if (hdr.isSymdef() or hdr.isSymdefSorted()) continue;
const name = if (hdr.name()) |name|
try gpa.dupe(u8, name)
else if (try hdr.nameOffset()) |off|
try gpa.dupe(u8, ctx.getString(off))
else
unreachable;
try ctx.objects.append(gpa, .{ .name = name, .off = stream.pos, .len = size });
}
var output = std.ArrayList(u8).init(gpa);
const writer = output.writer();
try ctx.dumpSymtab(writer);
try ctx.dumpObjects(writer);
return output.toOwnedSlice();
}
const ArchiveContext = struct {
gpa: Allocator,
data: []const u8,
symtab: std.ArrayListUnmanaged(ArSymtabEntry) = .{},
strtab: []const u8,
objects: std.ArrayListUnmanaged(struct { name: []const u8, off: usize, len: usize }) = .{},
fn parseSymtab(ctx: *ArchiveContext, raw: []const u8, ptr_width: enum { p32, p64 }) !void {
var stream = std.io.fixedBufferStream(raw);
const reader = stream.reader();
const num = switch (ptr_width) {
.p32 => try reader.readInt(u32, .big),
.p64 => try reader.readInt(u64, .big),
};
const ptr_size: usize = switch (ptr_width) {
.p32 => @sizeOf(u32),
.p64 => @sizeOf(u64),
};
const strtab_off = (num + 1) * ptr_size;
const strtab_len = raw.len - strtab_off;
const strtab = raw[strtab_off..][0..strtab_len];
try ctx.symtab.ensureTotalCapacityPrecise(ctx.gpa, num);
var stroff: usize = 0;
for (0..num) |_| {
const off = switch (ptr_width) {
.p32 => try reader.readInt(u32, .big),
.p64 => try reader.readInt(u64, .big),
};
const name = mem.sliceTo(@as([*:0]const u8, @ptrCast(strtab.ptr + stroff)), 0);
stroff += name.len + 1;
ctx.symtab.appendAssumeCapacity(.{ .off = off, .name = name });
}
}
fn dumpSymtab(ctx: ArchiveContext, writer: anytype) !void {
if (ctx.symtab.items.len == 0) return;
var files = std.AutoHashMap(usize, []const u8).init(ctx.gpa);
defer files.deinit();
try files.ensureUnusedCapacity(@intCast(ctx.objects.items.len));
for (ctx.objects.items) |object| {
files.putAssumeCapacityNoClobber(object.off - @sizeOf(elf.ar_hdr), object.name);
}
var symbols = std.AutoArrayHashMap(usize, std.ArrayList([]const u8)).init(ctx.gpa);
defer {
for (symbols.values()) |*value| {
value.deinit();
}
symbols.deinit();
}
for (ctx.symtab.items) |entry| {
const gop = try symbols.getOrPut(@intCast(entry.off));
if (!gop.found_existing) {
gop.value_ptr.* = std.ArrayList([]const u8).init(ctx.gpa);
}
try gop.value_ptr.append(entry.name);
}
try writer.print("{s}\n", .{archive_symtab_label});
for (symbols.keys(), symbols.values()) |off, values| {
try writer.print("in object {s}\n", .{files.get(off).?});
for (values.items) |value| {
try writer.print("{s}\n", .{value});
}
}
}
fn dumpObjects(ctx: ArchiveContext, writer: anytype) !void {
for (ctx.objects.items) |object| {
try writer.print("object {s}\n", .{object.name});
const output = try parseAndDumpObject(ctx.gpa, ctx.data[object.off..][0..object.len]);
defer ctx.gpa.free(output);
try writer.print("{s}\n", .{output});
}
}
fn getString(ctx: ArchiveContext, off: u32) []const u8 {
assert(off < ctx.strtab.len);
const name = mem.sliceTo(@as([*:'\n']const u8, @ptrCast(ctx.strtab.ptr + off)), 0);
return name[0 .. name.len - 1];
}
const ArSymtabEntry = struct {
name: [:0]const u8,
off: u64,
};
};
fn parseAndDumpObject(gpa: Allocator, bytes: []const u8) ![]const u8 {
var stream = std.io.fixedBufferStream(bytes);
const reader = stream.reader();
@@ -924,7 +1077,7 @@ const ElfDumper = struct {
const shdrs = @as([*]align(1) const elf.Elf64_Shdr, @ptrCast(bytes.ptr + hdr.e_shoff))[0..hdr.e_shnum];
const phdrs = @as([*]align(1) const elf.Elf64_Phdr, @ptrCast(bytes.ptr + hdr.e_phoff))[0..hdr.e_phnum];
var ctx = Context{
var ctx = ObjectContext{
.gpa = gpa,
.data = bytes,
.hdr = hdr,
@@ -932,14 +1085,14 @@ const ElfDumper = struct {
.phdrs = phdrs,
.shstrtab = undefined,
};
ctx.shstrtab = getSectionContents(ctx, ctx.hdr.e_shstrndx);
ctx.shstrtab = ctx.getSectionContents(ctx.hdr.e_shstrndx);
for (ctx.shdrs, 0..) |shdr, i| switch (shdr.sh_type) {
elf.SHT_SYMTAB, elf.SHT_DYNSYM => {
const raw = getSectionContents(ctx, i);
const raw = ctx.getSectionContents(i);
const nsyms = @divExact(raw.len, @sizeOf(elf.Elf64_Sym));
const symbols = @as([*]align(1) const elf.Elf64_Sym, @ptrCast(raw.ptr))[0..nsyms];
const strings = getSectionContents(ctx, shdr.sh_link);
const strings = ctx.getSectionContents(shdr.sh_link);
switch (shdr.sh_type) {
elf.SHT_SYMTAB => {
@@ -964,201 +1117,348 @@ const ElfDumper = struct {
var output = std.ArrayList(u8).init(gpa);
const writer = output.writer();
try dumpHeader(ctx, writer);
try dumpShdrs(ctx, writer);
try dumpPhdrs(ctx, writer);
try dumpDynamicSection(ctx, writer);
try dumpSymtab(ctx, .symtab, writer);
try dumpSymtab(ctx, .dysymtab, writer);
try ctx.dumpHeader(writer);
try ctx.dumpShdrs(writer);
try ctx.dumpPhdrs(writer);
try ctx.dumpDynamicSection(writer);
try ctx.dumpSymtab(.symtab, writer);
try ctx.dumpSymtab(.dysymtab, writer);
return output.toOwnedSlice();
}
inline fn getSectionName(ctx: Context, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
return getString(ctx.shstrtab, shdr.sh_name);
}
const ObjectContext = struct {
gpa: Allocator,
data: []const u8,
hdr: elf.Elf64_Ehdr,
shdrs: []align(1) const elf.Elf64_Shdr,
phdrs: []align(1) const elf.Elf64_Phdr,
shstrtab: []const u8,
symtab: ?Symtab = null,
dysymtab: ?Symtab = null,
fn getSectionContents(ctx: Context, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
assert(shdr.sh_offset < ctx.data.len);
assert(shdr.sh_offset + shdr.sh_size <= ctx.data.len);
return ctx.data[shdr.sh_offset..][0..shdr.sh_size];
}
fn dumpHeader(ctx: ObjectContext, writer: anytype) !void {
try writer.writeAll("header\n");
try writer.print("type {s}\n", .{@tagName(ctx.hdr.e_type)});
try writer.print("entry {x}\n", .{ctx.hdr.e_entry});
}
fn getSectionByName(ctx: Context, name: []const u8) ?usize {
for (0..ctx.shdrs.len) |shndx| {
if (mem.eql(u8, getSectionName(ctx, shndx), name)) return shndx;
} else return null;
}
fn dumpPhdrs(ctx: ObjectContext, writer: anytype) !void {
if (ctx.phdrs.len == 0) return;
try writer.writeAll("program headers\n");
for (ctx.phdrs, 0..) |phdr, phndx| {
try writer.print("phdr {d}\n", .{phndx});
try writer.print("type {s}\n", .{fmtPhType(phdr.p_type)});
try writer.print("vaddr {x}\n", .{phdr.p_vaddr});
try writer.print("paddr {x}\n", .{phdr.p_paddr});
try writer.print("offset {x}\n", .{phdr.p_offset});
try writer.print("memsz {x}\n", .{phdr.p_memsz});
try writer.print("filesz {x}\n", .{phdr.p_filesz});
try writer.print("align {x}\n", .{phdr.p_align});
{
const flags = phdr.p_flags;
try writer.writeAll("flags");
if (flags > 0) try writer.writeByte(' ');
if (flags & elf.PF_R != 0) {
try writer.writeByte('R');
}
if (flags & elf.PF_W != 0) {
try writer.writeByte('W');
}
if (flags & elf.PF_X != 0) {
try writer.writeByte('E');
}
if (flags & elf.PF_MASKOS != 0) {
try writer.writeAll("OS");
}
if (flags & elf.PF_MASKPROC != 0) {
try writer.writeAll("PROC");
}
try writer.writeByte('\n');
}
}
}
fn dumpShdrs(ctx: ObjectContext, writer: anytype) !void {
if (ctx.shdrs.len == 0) return;
try writer.writeAll("section headers\n");
for (ctx.shdrs, 0..) |shdr, shndx| {
try writer.print("shdr {d}\n", .{shndx});
try writer.print("name {s}\n", .{ctx.getSectionName(shndx)});
try writer.print("type {s}\n", .{fmtShType(shdr.sh_type)});
try writer.print("addr {x}\n", .{shdr.sh_addr});
try writer.print("offset {x}\n", .{shdr.sh_offset});
try writer.print("size {x}\n", .{shdr.sh_size});
try writer.print("addralign {x}\n", .{shdr.sh_addralign});
// TODO dump formatted sh_flags
}
}
fn dumpDynamicSection(ctx: ObjectContext, writer: anytype) !void {
const shndx = ctx.getSectionByName(".dynamic") orelse return;
const shdr = ctx.shdrs[shndx];
const strtab = ctx.getSectionContents(shdr.sh_link);
const data = ctx.getSectionContents(shndx);
const nentries = @divExact(data.len, @sizeOf(elf.Elf64_Dyn));
const entries = @as([*]align(1) const elf.Elf64_Dyn, @ptrCast(data.ptr))[0..nentries];
try writer.writeAll(ElfDumper.dynamic_section_label ++ "\n");
for (entries) |entry| {
const key = @as(u64, @bitCast(entry.d_tag));
const value = entry.d_val;
const key_str = switch (key) {
elf.DT_NEEDED => "NEEDED",
elf.DT_SONAME => "SONAME",
elf.DT_INIT_ARRAY => "INIT_ARRAY",
elf.DT_INIT_ARRAYSZ => "INIT_ARRAYSZ",
elf.DT_FINI_ARRAY => "FINI_ARRAY",
elf.DT_FINI_ARRAYSZ => "FINI_ARRAYSZ",
elf.DT_HASH => "HASH",
elf.DT_GNU_HASH => "GNU_HASH",
elf.DT_STRTAB => "STRTAB",
elf.DT_SYMTAB => "SYMTAB",
elf.DT_STRSZ => "STRSZ",
elf.DT_SYMENT => "SYMENT",
elf.DT_PLTGOT => "PLTGOT",
elf.DT_PLTRELSZ => "PLTRELSZ",
elf.DT_PLTREL => "PLTREL",
elf.DT_JMPREL => "JMPREL",
elf.DT_RELA => "RELA",
elf.DT_RELASZ => "RELASZ",
elf.DT_RELAENT => "RELAENT",
elf.DT_VERDEF => "VERDEF",
elf.DT_VERDEFNUM => "VERDEFNUM",
elf.DT_FLAGS => "FLAGS",
elf.DT_FLAGS_1 => "FLAGS_1",
elf.DT_VERNEED => "VERNEED",
elf.DT_VERNEEDNUM => "VERNEEDNUM",
elf.DT_VERSYM => "VERSYM",
elf.DT_RELACOUNT => "RELACOUNT",
elf.DT_RPATH => "RPATH",
elf.DT_RUNPATH => "RUNPATH",
elf.DT_INIT => "INIT",
elf.DT_FINI => "FINI",
elf.DT_NULL => "NULL",
else => "UNKNOWN",
};
try writer.print("{s}", .{key_str});
switch (key) {
elf.DT_NEEDED,
elf.DT_SONAME,
elf.DT_RPATH,
elf.DT_RUNPATH,
=> {
const name = getString(strtab, @intCast(value));
try writer.print(" {s}", .{name});
},
elf.DT_INIT_ARRAY,
elf.DT_FINI_ARRAY,
elf.DT_HASH,
elf.DT_GNU_HASH,
elf.DT_STRTAB,
elf.DT_SYMTAB,
elf.DT_PLTGOT,
elf.DT_JMPREL,
elf.DT_RELA,
elf.DT_VERDEF,
elf.DT_VERNEED,
elf.DT_VERSYM,
elf.DT_INIT,
elf.DT_FINI,
elf.DT_NULL,
=> try writer.print(" {x}", .{value}),
elf.DT_INIT_ARRAYSZ,
elf.DT_FINI_ARRAYSZ,
elf.DT_STRSZ,
elf.DT_SYMENT,
elf.DT_PLTRELSZ,
elf.DT_RELASZ,
elf.DT_RELAENT,
elf.DT_RELACOUNT,
=> try writer.print(" {d}", .{value}),
elf.DT_PLTREL => try writer.writeAll(switch (value) {
elf.DT_REL => " REL",
elf.DT_RELA => " RELA",
else => " UNKNOWN",
}),
elf.DT_FLAGS => if (value > 0) {
if (value & elf.DF_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_SYMBOLIC != 0) try writer.writeAll(" SYMBOLIC");
if (value & elf.DF_TEXTREL != 0) try writer.writeAll(" TEXTREL");
if (value & elf.DF_BIND_NOW != 0) try writer.writeAll(" BIND_NOW");
if (value & elf.DF_STATIC_TLS != 0) try writer.writeAll(" STATIC_TLS");
},
elf.DT_FLAGS_1 => if (value > 0) {
if (value & elf.DF_1_NOW != 0) try writer.writeAll(" NOW");
if (value & elf.DF_1_GLOBAL != 0) try writer.writeAll(" GLOBAL");
if (value & elf.DF_1_GROUP != 0) try writer.writeAll(" GROUP");
if (value & elf.DF_1_NODELETE != 0) try writer.writeAll(" NODELETE");
if (value & elf.DF_1_LOADFLTR != 0) try writer.writeAll(" LOADFLTR");
if (value & elf.DF_1_INITFIRST != 0) try writer.writeAll(" INITFIRST");
if (value & elf.DF_1_NOOPEN != 0) try writer.writeAll(" NOOPEN");
if (value & elf.DF_1_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_1_DIRECT != 0) try writer.writeAll(" DIRECT");
if (value & elf.DF_1_TRANS != 0) try writer.writeAll(" TRANS");
if (value & elf.DF_1_INTERPOSE != 0) try writer.writeAll(" INTERPOSE");
if (value & elf.DF_1_NODEFLIB != 0) try writer.writeAll(" NODEFLIB");
if (value & elf.DF_1_NODUMP != 0) try writer.writeAll(" NODUMP");
if (value & elf.DF_1_CONFALT != 0) try writer.writeAll(" CONFALT");
if (value & elf.DF_1_ENDFILTEE != 0) try writer.writeAll(" ENDFILTEE");
if (value & elf.DF_1_DISPRELDNE != 0) try writer.writeAll(" DISPRELDNE");
if (value & elf.DF_1_DISPRELPND != 0) try writer.writeAll(" DISPRELPND");
if (value & elf.DF_1_NODIRECT != 0) try writer.writeAll(" NODIRECT");
if (value & elf.DF_1_IGNMULDEF != 0) try writer.writeAll(" IGNMULDEF");
if (value & elf.DF_1_NOKSYMS != 0) try writer.writeAll(" NOKSYMS");
if (value & elf.DF_1_NOHDR != 0) try writer.writeAll(" NOHDR");
if (value & elf.DF_1_EDITED != 0) try writer.writeAll(" EDITED");
if (value & elf.DF_1_NORELOC != 0) try writer.writeAll(" NORELOC");
if (value & elf.DF_1_SYMINTPOSE != 0) try writer.writeAll(" SYMINTPOSE");
if (value & elf.DF_1_GLOBAUDIT != 0) try writer.writeAll(" GLOBAUDIT");
if (value & elf.DF_1_SINGLETON != 0) try writer.writeAll(" SINGLETON");
if (value & elf.DF_1_STUB != 0) try writer.writeAll(" STUB");
if (value & elf.DF_1_PIE != 0) try writer.writeAll(" PIE");
},
else => try writer.print(" {x}", .{value}),
}
try writer.writeByte('\n');
}
}
fn dumpSymtab(ctx: ObjectContext, comptime @"type": enum { symtab, dysymtab }, writer: anytype) !void {
const symtab = switch (@"type") {
.symtab => ctx.symtab,
.dysymtab => ctx.dysymtab,
} orelse return;
try writer.writeAll(switch (@"type") {
.symtab => symtab_label,
.dysymtab => dynamic_symtab_label,
} ++ "\n");
for (symtab.symbols, 0..) |sym, index| {
try writer.print("{x} {x}", .{ sym.st_value, sym.st_size });
{
if (elf.SHN_LORESERVE <= sym.st_shndx and sym.st_shndx < elf.SHN_HIRESERVE) {
if (elf.SHN_LOPROC <= sym.st_shndx and sym.st_shndx < elf.SHN_HIPROC) {
try writer.print(" LO+{d}", .{sym.st_shndx - elf.SHN_LOPROC});
} else {
const sym_ndx = switch (sym.st_shndx) {
elf.SHN_ABS => "ABS",
elf.SHN_COMMON => "COM",
elf.SHN_LIVEPATCH => "LIV",
else => "UNK",
};
try writer.print(" {s}", .{sym_ndx});
}
} else if (sym.st_shndx == elf.SHN_UNDEF) {
try writer.writeAll(" UND");
} else {
try writer.print(" {x}", .{sym.st_shndx});
}
}
blk: {
const tt = sym.st_type();
const sym_type = switch (tt) {
elf.STT_NOTYPE => "NOTYPE",
elf.STT_OBJECT => "OBJECT",
elf.STT_FUNC => "FUNC",
elf.STT_SECTION => "SECTION",
elf.STT_FILE => "FILE",
elf.STT_COMMON => "COMMON",
elf.STT_TLS => "TLS",
elf.STT_NUM => "NUM",
elf.STT_GNU_IFUNC => "IFUNC",
else => if (elf.STT_LOPROC <= tt and tt < elf.STT_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{tt - elf.STT_LOPROC});
} else if (elf.STT_LOOS <= tt and tt < elf.STT_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{tt - elf.STT_LOOS});
} else "UNK",
};
try writer.print(" {s}", .{sym_type});
}
blk: {
const bind = sym.st_bind();
const sym_bind = switch (bind) {
elf.STB_LOCAL => "LOCAL",
elf.STB_GLOBAL => "GLOBAL",
elf.STB_WEAK => "WEAK",
elf.STB_NUM => "NUM",
else => if (elf.STB_LOPROC <= bind and bind < elf.STB_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{bind - elf.STB_LOPROC});
} else if (elf.STB_LOOS <= bind and bind < elf.STB_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{bind - elf.STB_LOOS});
} else "UNKNOWN",
};
try writer.print(" {s}", .{sym_bind});
}
const sym_vis = @as(elf.STV, @enumFromInt(sym.st_other));
try writer.print(" {s}", .{@tagName(sym_vis)});
const sym_name = switch (sym.st_type()) {
elf.STT_SECTION => ctx.getSectionName(sym.st_shndx),
else => symtab.getName(index).?,
};
try writer.print(" {s}\n", .{sym_name});
}
}
inline fn getSectionName(ctx: ObjectContext, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
return getString(ctx.shstrtab, shdr.sh_name);
}
fn getSectionContents(ctx: ObjectContext, shndx: usize) []const u8 {
const shdr = ctx.shdrs[shndx];
assert(shdr.sh_offset < ctx.data.len);
assert(shdr.sh_offset + shdr.sh_size <= ctx.data.len);
return ctx.data[shdr.sh_offset..][0..shdr.sh_size];
}
fn getSectionByName(ctx: ObjectContext, name: []const u8) ?usize {
for (0..ctx.shdrs.len) |shndx| {
if (mem.eql(u8, ctx.getSectionName(shndx), name)) return shndx;
} else return null;
}
};
const Symtab = struct {
symbols: []align(1) const elf.Elf64_Sym,
strings: []const u8,
fn get(st: Symtab, index: usize) ?elf.Elf64_Sym {
if (index >= st.symbols.len) return null;
return st.symbols[index];
}
fn getName(st: Symtab, index: usize) ?[]const u8 {
const sym = st.get(index) orelse return null;
return getString(st.strings, sym.st_name);
}
};
fn getString(strtab: []const u8, off: u32) []const u8 {
assert(off < strtab.len);
return mem.sliceTo(@as([*:0]const u8, @ptrCast(strtab.ptr + off)), 0);
}
fn dumpHeader(ctx: Context, writer: anytype) !void {
try writer.writeAll("header\n");
try writer.print("type {s}\n", .{@tagName(ctx.hdr.e_type)});
try writer.print("entry {x}\n", .{ctx.hdr.e_entry});
}
fn dumpShdrs(ctx: Context, writer: anytype) !void {
if (ctx.shdrs.len == 0) return;
try writer.writeAll("section headers\n");
for (ctx.shdrs, 0..) |shdr, shndx| {
try writer.print("shdr {d}\n", .{shndx});
try writer.print("name {s}\n", .{getSectionName(ctx, shndx)});
try writer.print("type {s}\n", .{fmtShType(shdr.sh_type)});
try writer.print("addr {x}\n", .{shdr.sh_addr});
try writer.print("offset {x}\n", .{shdr.sh_offset});
try writer.print("size {x}\n", .{shdr.sh_size});
try writer.print("addralign {x}\n", .{shdr.sh_addralign});
// TODO dump formatted sh_flags
}
}
fn dumpDynamicSection(ctx: Context, writer: anytype) !void {
const shndx = getSectionByName(ctx, ".dynamic") orelse return;
const shdr = ctx.shdrs[shndx];
const strtab = getSectionContents(ctx, shdr.sh_link);
const data = getSectionContents(ctx, shndx);
const nentries = @divExact(data.len, @sizeOf(elf.Elf64_Dyn));
const entries = @as([*]align(1) const elf.Elf64_Dyn, @ptrCast(data.ptr))[0..nentries];
try writer.writeAll(ElfDumper.dynamic_section_label ++ "\n");
for (entries) |entry| {
const key = @as(u64, @bitCast(entry.d_tag));
const value = entry.d_val;
const key_str = switch (key) {
elf.DT_NEEDED => "NEEDED",
elf.DT_SONAME => "SONAME",
elf.DT_INIT_ARRAY => "INIT_ARRAY",
elf.DT_INIT_ARRAYSZ => "INIT_ARRAYSZ",
elf.DT_FINI_ARRAY => "FINI_ARRAY",
elf.DT_FINI_ARRAYSZ => "FINI_ARRAYSZ",
elf.DT_HASH => "HASH",
elf.DT_GNU_HASH => "GNU_HASH",
elf.DT_STRTAB => "STRTAB",
elf.DT_SYMTAB => "SYMTAB",
elf.DT_STRSZ => "STRSZ",
elf.DT_SYMENT => "SYMENT",
elf.DT_PLTGOT => "PLTGOT",
elf.DT_PLTRELSZ => "PLTRELSZ",
elf.DT_PLTREL => "PLTREL",
elf.DT_JMPREL => "JMPREL",
elf.DT_RELA => "RELA",
elf.DT_RELASZ => "RELASZ",
elf.DT_RELAENT => "RELAENT",
elf.DT_VERDEF => "VERDEF",
elf.DT_VERDEFNUM => "VERDEFNUM",
elf.DT_FLAGS => "FLAGS",
elf.DT_FLAGS_1 => "FLAGS_1",
elf.DT_VERNEED => "VERNEED",
elf.DT_VERNEEDNUM => "VERNEEDNUM",
elf.DT_VERSYM => "VERSYM",
elf.DT_RELACOUNT => "RELACOUNT",
elf.DT_RPATH => "RPATH",
elf.DT_RUNPATH => "RUNPATH",
elf.DT_INIT => "INIT",
elf.DT_FINI => "FINI",
elf.DT_NULL => "NULL",
else => "UNKNOWN",
};
try writer.print("{s}", .{key_str});
switch (key) {
elf.DT_NEEDED,
elf.DT_SONAME,
elf.DT_RPATH,
elf.DT_RUNPATH,
=> {
const name = getString(strtab, @intCast(value));
try writer.print(" {s}", .{name});
},
elf.DT_INIT_ARRAY,
elf.DT_FINI_ARRAY,
elf.DT_HASH,
elf.DT_GNU_HASH,
elf.DT_STRTAB,
elf.DT_SYMTAB,
elf.DT_PLTGOT,
elf.DT_JMPREL,
elf.DT_RELA,
elf.DT_VERDEF,
elf.DT_VERNEED,
elf.DT_VERSYM,
elf.DT_INIT,
elf.DT_FINI,
elf.DT_NULL,
=> try writer.print(" {x}", .{value}),
elf.DT_INIT_ARRAYSZ,
elf.DT_FINI_ARRAYSZ,
elf.DT_STRSZ,
elf.DT_SYMENT,
elf.DT_PLTRELSZ,
elf.DT_RELASZ,
elf.DT_RELAENT,
elf.DT_RELACOUNT,
=> try writer.print(" {d}", .{value}),
elf.DT_PLTREL => try writer.writeAll(switch (value) {
elf.DT_REL => " REL",
elf.DT_RELA => " RELA",
else => " UNKNOWN",
}),
elf.DT_FLAGS => if (value > 0) {
if (value & elf.DF_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_SYMBOLIC != 0) try writer.writeAll(" SYMBOLIC");
if (value & elf.DF_TEXTREL != 0) try writer.writeAll(" TEXTREL");
if (value & elf.DF_BIND_NOW != 0) try writer.writeAll(" BIND_NOW");
if (value & elf.DF_STATIC_TLS != 0) try writer.writeAll(" STATIC_TLS");
},
elf.DT_FLAGS_1 => if (value > 0) {
if (value & elf.DF_1_NOW != 0) try writer.writeAll(" NOW");
if (value & elf.DF_1_GLOBAL != 0) try writer.writeAll(" GLOBAL");
if (value & elf.DF_1_GROUP != 0) try writer.writeAll(" GROUP");
if (value & elf.DF_1_NODELETE != 0) try writer.writeAll(" NODELETE");
if (value & elf.DF_1_LOADFLTR != 0) try writer.writeAll(" LOADFLTR");
if (value & elf.DF_1_INITFIRST != 0) try writer.writeAll(" INITFIRST");
if (value & elf.DF_1_NOOPEN != 0) try writer.writeAll(" NOOPEN");
if (value & elf.DF_1_ORIGIN != 0) try writer.writeAll(" ORIGIN");
if (value & elf.DF_1_DIRECT != 0) try writer.writeAll(" DIRECT");
if (value & elf.DF_1_TRANS != 0) try writer.writeAll(" TRANS");
if (value & elf.DF_1_INTERPOSE != 0) try writer.writeAll(" INTERPOSE");
if (value & elf.DF_1_NODEFLIB != 0) try writer.writeAll(" NODEFLIB");
if (value & elf.DF_1_NODUMP != 0) try writer.writeAll(" NODUMP");
if (value & elf.DF_1_CONFALT != 0) try writer.writeAll(" CONFALT");
if (value & elf.DF_1_ENDFILTEE != 0) try writer.writeAll(" ENDFILTEE");
if (value & elf.DF_1_DISPRELDNE != 0) try writer.writeAll(" DISPRELDNE");
if (value & elf.DF_1_DISPRELPND != 0) try writer.writeAll(" DISPRELPND");
if (value & elf.DF_1_NODIRECT != 0) try writer.writeAll(" NODIRECT");
if (value & elf.DF_1_IGNMULDEF != 0) try writer.writeAll(" IGNMULDEF");
if (value & elf.DF_1_NOKSYMS != 0) try writer.writeAll(" NOKSYMS");
if (value & elf.DF_1_NOHDR != 0) try writer.writeAll(" NOHDR");
if (value & elf.DF_1_EDITED != 0) try writer.writeAll(" EDITED");
if (value & elf.DF_1_NORELOC != 0) try writer.writeAll(" NORELOC");
if (value & elf.DF_1_SYMINTPOSE != 0) try writer.writeAll(" SYMINTPOSE");
if (value & elf.DF_1_GLOBAUDIT != 0) try writer.writeAll(" GLOBAUDIT");
if (value & elf.DF_1_SINGLETON != 0) try writer.writeAll(" SINGLETON");
if (value & elf.DF_1_STUB != 0) try writer.writeAll(" STUB");
if (value & elf.DF_1_PIE != 0) try writer.writeAll(" PIE");
},
else => try writer.print(" {x}", .{value}),
}
try writer.writeByte('\n');
}
}
fn fmtShType(sh_type: u32) std.fmt.Formatter(formatShType) {
return .{ .data = sh_type };
}
@@ -1206,45 +1506,6 @@ const ElfDumper = struct {
try writer.writeAll(name);
}
fn dumpPhdrs(ctx: Context, writer: anytype) !void {
if (ctx.phdrs.len == 0) return;
try writer.writeAll("program headers\n");
for (ctx.phdrs, 0..) |phdr, phndx| {
try writer.print("phdr {d}\n", .{phndx});
try writer.print("type {s}\n", .{fmtPhType(phdr.p_type)});
try writer.print("vaddr {x}\n", .{phdr.p_vaddr});
try writer.print("paddr {x}\n", .{phdr.p_paddr});
try writer.print("offset {x}\n", .{phdr.p_offset});
try writer.print("memsz {x}\n", .{phdr.p_memsz});
try writer.print("filesz {x}\n", .{phdr.p_filesz});
try writer.print("align {x}\n", .{phdr.p_align});
{
const flags = phdr.p_flags;
try writer.writeAll("flags");
if (flags > 0) try writer.writeByte(' ');
if (flags & elf.PF_R != 0) {
try writer.writeByte('R');
}
if (flags & elf.PF_W != 0) {
try writer.writeByte('W');
}
if (flags & elf.PF_X != 0) {
try writer.writeByte('E');
}
if (flags & elf.PF_MASKOS != 0) {
try writer.writeAll("OS");
}
if (flags & elf.PF_MASKPROC != 0) {
try writer.writeAll("PROC");
}
try writer.writeByte('\n');
}
}
}
fn fmtPhType(ph_type: u32) std.fmt.Formatter(formatPhType) {
return .{ .data = ph_type };
}
@@ -1278,88 +1539,6 @@ const ElfDumper = struct {
};
try writer.writeAll(p_type);
}
fn dumpSymtab(ctx: Context, comptime @"type": enum { symtab, dysymtab }, writer: anytype) !void {
const symtab = switch (@"type") {
.symtab => ctx.symtab,
.dysymtab => ctx.dysymtab,
} orelse return;
try writer.writeAll(switch (@"type") {
.symtab => symtab_label,
.dysymtab => dynamic_symtab_label,
} ++ "\n");
for (symtab.symbols, 0..) |sym, index| {
try writer.print("{x} {x}", .{ sym.st_value, sym.st_size });
{
if (elf.SHN_LORESERVE <= sym.st_shndx and sym.st_shndx < elf.SHN_HIRESERVE) {
if (elf.SHN_LOPROC <= sym.st_shndx and sym.st_shndx < elf.SHN_HIPROC) {
try writer.print(" LO+{d}", .{sym.st_shndx - elf.SHN_LOPROC});
} else {
const sym_ndx = &switch (sym.st_shndx) {
elf.SHN_ABS => "ABS",
elf.SHN_COMMON => "COM",
elf.SHN_LIVEPATCH => "LIV",
else => "UNK",
};
try writer.print(" {s}", .{sym_ndx});
}
} else if (sym.st_shndx == elf.SHN_UNDEF) {
try writer.writeAll(" UND");
} else {
try writer.print(" {x}", .{sym.st_shndx});
}
}
blk: {
const tt = sym.st_type();
const sym_type = switch (tt) {
elf.STT_NOTYPE => "NOTYPE",
elf.STT_OBJECT => "OBJECT",
elf.STT_FUNC => "FUNC",
elf.STT_SECTION => "SECTION",
elf.STT_FILE => "FILE",
elf.STT_COMMON => "COMMON",
elf.STT_TLS => "TLS",
elf.STT_NUM => "NUM",
elf.STT_GNU_IFUNC => "IFUNC",
else => if (elf.STT_LOPROC <= tt and tt < elf.STT_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{tt - elf.STT_LOPROC});
} else if (elf.STT_LOOS <= tt and tt < elf.STT_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{tt - elf.STT_LOOS});
} else "UNK",
};
try writer.print(" {s}", .{sym_type});
}
blk: {
const bind = sym.st_bind();
const sym_bind = switch (bind) {
elf.STB_LOCAL => "LOCAL",
elf.STB_GLOBAL => "GLOBAL",
elf.STB_WEAK => "WEAK",
elf.STB_NUM => "NUM",
else => if (elf.STB_LOPROC <= bind and bind < elf.STB_HIPROC) {
break :blk try writer.print(" LOPROC+{d}", .{bind - elf.STB_LOPROC});
} else if (elf.STB_LOOS <= bind and bind < elf.STB_HIOS) {
break :blk try writer.print(" LOOS+{d}", .{bind - elf.STB_LOOS});
} else "UNKNOWN",
};
try writer.print(" {s}", .{sym_bind});
}
const sym_vis = @as(elf.STV, @enumFromInt(sym.st_other));
try writer.print(" {s}", .{@tagName(sym_vis)});
const sym_name = switch (sym.st_type()) {
elf.STT_SECTION => getSectionName(ctx, sym.st_shndx),
else => symtab.getName(index).?,
};
try writer.print(" {s}\n", .{sym_name});
}
}
};
const WasmDumper = struct {