authorgravatar for kubkon@jakubkonka.comJakub Konka <kubkon@jakubkonka.com> 2023-07-20 08:39:49+02:00
committergravatar for kubkon@jakubkonka.comJakub Konka <kubkon@jakubkonka.com> 2023-07-20 20:01:06+02:00
log5839054e8591f60cbfdd3693398ecd5844530fe9
treeefd4d79e0926916c0031d3e7f5277d25801a9f3e
parent17255bed41a4b2c31a3f4342d51aa80a6f9d6b0b

check-object: dump contents of .dynamic section

1 files changed, 150 insertions(+), 2 deletions(-)

lib/std/Build/Step/CheckObject.zig+150-2
......@@ -712,8 +712,7 @@ const ElfDumper = struct {
712712
713713 fn getName(st: Symtab, index: usize) ?[]const u8 {
714714 const sym = st.get(index) orelse return null;
715 assert(sym.st_name < st.strings.len);
716 return mem.sliceTo(@ptrCast(st.strings.ptr + sym.st_name), 0);
715 return getString(st.strings, sym.st_name);
717716 }
718717 };
719718
......@@ -786,6 +785,7 @@ const ElfDumper = struct {
786785 try dumpHeader(ctx, writer);
787786 try dumpShdrs(ctx, writer);
788787 try dumpPhdrs(ctx, writer);
788 try dumpDynamic(ctx, writer);
789789
790790 return output.toOwnedSlice();
791791 }
......@@ -803,6 +803,17 @@ const ElfDumper = struct {
803803 return ctx.data[shdr.sh_offset..][0..shdr.sh_size];
804804 }
805805
806 fn getSectionByName(ctx: Context, name: []const u8) ?usize {
807 for (0..ctx.shdrs.len) |shndx| {
808 if (mem.eql(u8, getSectionName(ctx, shndx), name)) return shndx;
809 } else return null;
810 }
811
812 fn getString(strtab: []const u8, off: u32) []const u8 {
813 assert(off < strtab.len);
814 return mem.sliceTo(@as([*:0]const u8, @ptrCast(strtab.ptr + off)), 0);
815 }
816
806817 fn dumpHeader(ctx: Context, writer: anytype) !void {
807818 try writer.writeAll("header\n");
808819 try writer.print("type {s}\n", .{@tagName(ctx.hdr.e_type)});
......@@ -824,6 +835,143 @@ const ElfDumper = struct {
824835 }
825836 }
826837
838 fn dumpDynamic(ctx: Context, writer: anytype) !void {
839 const shndx = getSectionByName(ctx, ".dynamic") orelse return;
840 const shdr = ctx.shdrs[shndx];
841 const strtab = getSectionContents(ctx, shdr.sh_link);
842 const data = getSectionContents(ctx, shndx);
843 const nentries = @divExact(data.len, @sizeOf(elf.Elf64_Dyn));
844 const entries = @as([*]align(1) const elf.Elf64_Dyn, @ptrCast(data.ptr))[0..nentries];
845
846 for (entries) |entry| {
847 const key = @as(u64, @bitCast(entry.d_tag));
848 const value = entry.d_val;
849
850 const key_str = switch (key) {
851 elf.DT_NEEDED => "NEEDED",
852 elf.DT_SONAME => "SONAME",
853 elf.DT_INIT_ARRAY => "INIT_ARRAY",
854 elf.DT_INIT_ARRAYSZ => "INIT_ARRAYSZ",
855 elf.DT_FINI_ARRAY => "FINI_ARRAY",
856 elf.DT_FINI_ARRAYSZ => "FINI_ARRAYSZ",
857 elf.DT_HASH => "HASH",
858 elf.DT_GNU_HASH => "GNU_HASH",
859 elf.DT_STRTAB => "STRTAB",
860 elf.DT_SYMTAB => "SYMTAB",
861 elf.DT_STRSZ => "STRSZ",
862 elf.DT_SYMENT => "SYMENT",
863 elf.DT_PLTGOT => "PLTGOT",
864 elf.DT_PLTRELSZ => "PLTRELSZ",
865 elf.DT_PLTREL => "PLTREL",
866 elf.DT_JMPREL => "JMPREL",
867 elf.DT_RELA => "RELA",
868 elf.DT_RELASZ => "RELASZ",
869 elf.DT_RELAENT => "RELAENT",
870 elf.DT_VERDEF => "VERDEF",
871 elf.DT_VERDEFNUM => "VERDEFNUM",
872 elf.DT_FLAGS => "FLAGS",
873 elf.DT_FLAGS_1 => "FLAGS_1",
874 elf.DT_VERNEED => "VERNEED",
875 elf.DT_VERNEEDNUM => "VERNEEDNUM",
876 elf.DT_VERSYM => "VERSYM",
877 elf.DT_RELACOUNT => "RELACOUNT",
878 elf.DT_RPATH => "RPATH",
879 elf.DT_RUNPATH => "RUNPATH",
880 elf.DT_INIT => "INIT",
881 elf.DT_FINI => "FINI",
882 elf.DT_NULL => "NULL",
883 else => "UNKNOWN",
884 };
885 try writer.print("{s}", .{key_str});
886
887 switch (key) {
888 elf.DT_NEEDED,
889 elf.DT_SONAME,
890 elf.DT_RPATH,
891 elf.DT_RUNPATH,
892 => {
893 const name = getString(strtab, @intCast(value));
894 try writer.print(" {s}", .{name});
895 },
896
897 elf.DT_INIT_ARRAY,
898 elf.DT_FINI_ARRAY,
899 elf.DT_HASH,
900 elf.DT_GNU_HASH,
901 elf.DT_STRTAB,
902 elf.DT_SYMTAB,
903 elf.DT_PLTGOT,
904 elf.DT_JMPREL,
905 elf.DT_RELA,
906 elf.DT_VERDEF,
907 elf.DT_VERNEED,
908 elf.DT_VERSYM,
909 elf.DT_INIT,
910 elf.DT_FINI,
911 elf.DT_NULL,
912 => try writer.print(" {x}", .{value}),
913
914 elf.DT_INIT_ARRAYSZ,
915 elf.DT_FINI_ARRAYSZ,
916 elf.DT_STRSZ,
917 elf.DT_SYMENT,
918 elf.DT_PLTRELSZ,
919 elf.DT_RELASZ,
920 elf.DT_RELAENT,
921 elf.DT_RELACOUNT,
922 => try writer.print(" {d}", .{value}),
923
924 elf.DT_PLTREL => try writer.writeAll(switch (value) {
925 elf.DT_REL => " REL",
926 elf.DT_RELA => " RELA",
927 else => " UNKNOWN",
928 }),
929
930 elf.DT_FLAGS => if (value > 0) {
931 if (value & elf.DF_ORIGIN != 0) try writer.writeAll(" ORIGIN");
932 if (value & elf.DF_SYMBOLIC != 0) try writer.writeAll(" SYMBOLIC");
933 if (value & elf.DF_TEXTREL != 0) try writer.writeAll(" TEXTREL");
934 if (value & elf.DF_BIND_NOW != 0) try writer.writeAll(" BIND_NOW");
935 if (value & elf.DF_STATIC_TLS != 0) try writer.writeAll(" STATIC_TLS");
936 },
937
938 elf.DT_FLAGS_1 => if (value > 0) {
939 if (value & elf.DF_1_NOW != 0) try writer.writeAll(" NOW");
940 if (value & elf.DF_1_GLOBAL != 0) try writer.writeAll(" GLOBAL");
941 if (value & elf.DF_1_GROUP != 0) try writer.writeAll(" GROUP");
942 if (value & elf.DF_1_NODELETE != 0) try writer.writeAll(" NODELETE");
943 if (value & elf.DF_1_LOADFLTR != 0) try writer.writeAll(" LOADFLTR");
944 if (value & elf.DF_1_INITFIRST != 0) try writer.writeAll(" INITFIRST");
945 if (value & elf.DF_1_NOOPEN != 0) try writer.writeAll(" NOOPEN");
946 if (value & elf.DF_1_ORIGIN != 0) try writer.writeAll(" ORIGIN");
947 if (value & elf.DF_1_DIRECT != 0) try writer.writeAll(" DIRECT");
948 if (value & elf.DF_1_TRANS != 0) try writer.writeAll(" TRANS");
949 if (value & elf.DF_1_INTERPOSE != 0) try writer.writeAll(" INTERPOSE");
950 if (value & elf.DF_1_NODEFLIB != 0) try writer.writeAll(" NODEFLIB");
951 if (value & elf.DF_1_NODUMP != 0) try writer.writeAll(" NODUMP");
952 if (value & elf.DF_1_CONFALT != 0) try writer.writeAll(" CONFALT");
953 if (value & elf.DF_1_ENDFILTEE != 0) try writer.writeAll(" ENDFILTEE");
954 if (value & elf.DF_1_DISPRELDNE != 0) try writer.writeAll(" DISPRELDNE");
955 if (value & elf.DF_1_DISPRELPND != 0) try writer.writeAll(" DISPRELPND");
956 if (value & elf.DF_1_NODIRECT != 0) try writer.writeAll(" NODIRECT");
957 if (value & elf.DF_1_IGNMULDEF != 0) try writer.writeAll(" IGNMULDEF");
958 if (value & elf.DF_1_NOKSYMS != 0) try writer.writeAll(" NOKSYMS");
959 if (value & elf.DF_1_NOHDR != 0) try writer.writeAll(" NOHDR");
960 if (value & elf.DF_1_EDITED != 0) try writer.writeAll(" EDITED");
961 if (value & elf.DF_1_NORELOC != 0) try writer.writeAll(" NORELOC");
962 if (value & elf.DF_1_SYMINTPOSE != 0) try writer.writeAll(" SYMINTPOSE");
963 if (value & elf.DF_1_GLOBAUDIT != 0) try writer.writeAll(" GLOBAUDIT");
964 if (value & elf.DF_1_SINGLETON != 0) try writer.writeAll(" SINGLETON");
965 if (value & elf.DF_1_STUB != 0) try writer.writeAll(" STUB");
966 if (value & elf.DF_1_PIE != 0) try writer.writeAll(" PIE");
967 },
968
969 else => try writer.print(" {x}", .{value}),
970 }
971 try writer.writeByte('\n');
972 }
973 }
974
827975 fn fmtShType(sh_type: u32) std.fmt.Formatter(formatShType) {
828976 return .{ .data = sh_type };
829977 }