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check-object: dump info on PHDRs
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@kubkon
kubkon committed Jul 13, 2023
1 parent 33154b5 commit 77026c6
Showing 1 changed file with 102 additions and 39 deletions.
141 changes: 102 additions & 39 deletions lib/std/Build/Step/CheckObject.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -785,6 +785,7 @@ const ElfDumper = struct {

try dumpHeader(ctx, writer);
try dumpShdrs(ctx, writer);
try dumpPhdrs(ctx, writer);

return output.toOwnedSlice();
}
Expand Down Expand Up @@ -814,52 +815,114 @@ const ElfDumper = struct {
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", .{try fmtShType(ctx.gpa, shdr.sh_type)});
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 fmtShType(gpa: Allocator, sh_type: u32) ![]const u8 {
return switch (sh_type) {
elf.SHT_NULL => "NULL",
elf.SHT_PROGBITS => "PROGBITS",
elf.SHT_SYMTAB => "SYMTAB",
elf.SHT_STRTAB => "STRTAB",
elf.SHT_RELA => "RELA",
elf.SHT_HASH => "HASH",
elf.SHT_DYNAMIC => "DYNAMIC",
elf.SHT_NOTE => "NOTE",
elf.SHT_NOBITS => "NOBITS",
elf.SHT_REL => "REL",
elf.SHT_SHLIB => "SHLIB",
elf.SHT_DYNSYM => "DYNSYM",
elf.SHT_INIT_ARRAY => "INIT_ARRAY",
elf.SHT_FINI_ARRAY => "FINI_ARRAY",
elf.SHT_PREINIT_ARRAY => "PREINIT_ARRAY",
elf.SHT_GROUP => "GROUP",
elf.SHT_SYMTAB_SHNDX => "SYMTAB_SHNDX",
elf.SHT_X86_64_UNWIND => "X86_64_UNWIND",
elf.SHT_LLVM_ADDRSIG => "LLVM_ADDRSIG",
elf.SHT_GNU_HASH => "GNU_HASH",
elf.SHT_GNU_VERDEF => "VERDEF",
elf.SHT_GNU_VERNEED => "VERNEED",
elf.SHT_GNU_VERSYM => "VERSYM",
else => |sht| blk: {
if (elf.SHT_LOOS <= sht and sht < elf.SHT_HIOS) {
break :blk try std.fmt.allocPrint(gpa, "LOOS+0x{x}", .{sht - elf.SHT_LOOS});
}
if (elf.SHT_LOPROC <= sht and sht < elf.SHT_HIPROC) {
break :blk try std.fmt.allocPrint(gpa, "LOPROC+0x{x}", .{sht - elf.SHT_LOPROC});
}
if (elf.SHT_LOUSER <= sht and sht < elf.SHT_HIUSER) {
break :blk try std.fmt.allocPrint(gpa, "LOUSER+0x{x}", .{sht - elf.SHT_LOUSER});
}
break :blk "UNKNOWN";
},
};
fn fmtShType(sh_type: u32) std.fmt.Formatter(formatShType) {
return .{ .data = sh_type };
}

fn formatShType(
sh_type: u32,
comptime unused_fmt_string: []const u8,
options: std.fmt.FormatOptions,
writer: anytype,
) !void {
_ = unused_fmt_string;
_ = options;
if (elf.SHT_LOOS <= sh_type and sh_type < elf.SHT_HIOS) {
try writer.print("LOOS+0x{x}", .{sh_type - elf.SHT_LOOS});
} else if (elf.SHT_LOPROC <= sh_type and sh_type < elf.SHT_HIPROC) {
try writer.print("LOPROC+0x{x}", .{sh_type - elf.SHT_LOPROC});
} else if (elf.SHT_LOUSER <= sh_type and sh_type < elf.SHT_HIUSER) {
try writer.print("LOUSER+0x{x}", .{sh_type - elf.SHT_LOUSER});
} else {
const name = switch (sh_type) {
elf.SHT_NULL => "NULL",
elf.SHT_PROGBITS => "PROGBITS",
elf.SHT_SYMTAB => "SYMTAB",
elf.SHT_STRTAB => "STRTAB",
elf.SHT_RELA => "RELA",
elf.SHT_HASH => "HASH",
elf.SHT_DYNAMIC => "DYNAMIC",
elf.SHT_NOTE => "NOTE",
elf.SHT_NOBITS => "NOBITS",
elf.SHT_REL => "REL",
elf.SHT_SHLIB => "SHLIB",
elf.SHT_DYNSYM => "DYNSYM",
elf.SHT_INIT_ARRAY => "INIT_ARRAY",
elf.SHT_FINI_ARRAY => "FINI_ARRAY",
elf.SHT_PREINIT_ARRAY => "PREINIT_ARRAY",
elf.SHT_GROUP => "GROUP",
elf.SHT_SYMTAB_SHNDX => "SYMTAB_SHNDX",
elf.SHT_X86_64_UNWIND => "X86_64_UNWIND",
elf.SHT_LLVM_ADDRSIG => "LLVM_ADDRSIG",
elf.SHT_GNU_HASH => "GNU_HASH",
elf.SHT_GNU_VERDEF => "VERDEF",
elf.SHT_GNU_VERNEED => "VERNEED",
elf.SHT_GNU_VERSYM => "VERSYM",
else => "UNKNOWN",
};
try writer.writeAll(name);
}
}

fn dumpPhdrs(ctx: Context, writer: anytype) !void {
if (ctx.phdrs.len == 0) return;

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});
// TODO dump formatted p_flags
}
}

fn fmtPhType(ph_type: u32) std.fmt.Formatter(formatPhType) {
return .{ .data = ph_type };
}

fn formatPhType(
ph_type: u32,
comptime unused_fmt_string: []const u8,
options: std.fmt.FormatOptions,
writer: anytype,
) !void {
_ = unused_fmt_string;
_ = options;
if (elf.PT_LOOS <= ph_type and ph_type < elf.PT_HIOS) {
try writer.print("LOOS+0x{x}", .{ph_type - elf.PT_LOOS});
} else if (elf.PT_LOPROC <= ph_type and ph_type < elf.PT_HIPROC) {
try writer.print("LOPROC+0x{x}", .{ph_type - elf.PT_LOPROC});
} else {
const p_type = switch (ph_type) {
elf.PT_NULL => "NULL",
elf.PT_LOAD => "LOAD",
elf.PT_DYNAMIC => "DYNAMIC",
elf.PT_INTERP => "INTERP",
elf.PT_NOTE => "NOTE",
elf.PT_SHLIB => "SHLIB",
elf.PT_PHDR => "PHDR",
elf.PT_TLS => "TLS",
elf.PT_NUM => "NUM",
elf.PT_GNU_EH_FRAME => "GNU_EH_FRAME",
elf.PT_GNU_STACK => "GNU_STACK",
elf.PT_GNU_RELRO => "GNU_RELRO",
else => "UNKNOWN",
};
try writer.writeAll(p_type);
}
}
};

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