From: Mark Wielaard Date: Thu, 14 Apr 2011 21:47:26 +0000 (+0200) Subject: Add printing of .gdb_index section to readelf. X-Git-Tag: elfutils-0.153~47^2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=093a1d3cde3995649436919b27fc92c91eeddfbf;p=thirdparty%2Felfutils.git Add printing of .gdb_index section to readelf. --- diff --git a/src/ChangeLog b/src/ChangeLog index 956cce2a5..39ecf18f6 100644 --- a/src/ChangeLog +++ b/src/ChangeLog @@ -1,3 +1,11 @@ +2011-04-14 Mark Wielaard + + * readelf.c (options): Add gdb_index. + (section_e): Define section_gdb_index. + (parse_opt): Recognize gdb_index debug-dump argument. + (print_gdb_index_section): New function. + (print_debug): Add gdb_index to debug_sections. + 2011-03-24 Petr Machata * readelf.c (print_debug_line_section): Emit initial space for all diff --git a/src/readelf.c b/src/readelf.c index f2c48007f..bee3b0de2 100644 --- a/src/readelf.c +++ b/src/readelf.c @@ -93,8 +93,8 @@ static const struct argp_option options[] = { NULL, 0, NULL, 0, N_("Additional output selection:"), 0 }, { "debug-dump", 'w', "SECTION", OPTION_ARG_OPTIONAL, N_("Display DWARF section content. SECTION can be one of abbrev, " - "aranges, frame, info, loc, line, ranges, pubnames, str, macinfo, " - "or exception"), 0 }, + "aranges, frame, gdb_index, info, loc, line, ranges, pubnames, str, " + "macinfo, or exception"), 0 }, { "hex-dump", 'x', "SECTION", 0, N_("Dump the uninterpreted contents of SECTION, by number or name"), 0 }, { "strings", 'p', "SECTION", OPTION_ARG_OPTIONAL, @@ -189,10 +189,11 @@ static enum section_e section_macinfo = 256, /* .debug_macinfo */ section_ranges = 512, /* .debug_ranges */ section_exception = 1024, /* .eh_frame & al. */ + section_gdb_index = 2048, /* .gdb_index */ section_all = (section_abbrev | section_aranges | section_frame | section_info | section_line | section_loc | section_pubnames | section_str | section_macinfo - | section_ranges | section_exception) + | section_ranges | section_exception | section_gdb_index) } print_debug_sections, implicit_debug_sections; /* Select hex dumping of sections. */ @@ -403,6 +404,8 @@ parse_opt (int key, char *arg, print_debug_sections |= section_macinfo; else if (strcmp (arg, "exception") == 0) print_debug_sections |= section_exception; + else if (strcmp (arg, "gdb_index") == 0) + print_debug_sections |= section_gdb_index; else { fprintf (stderr, gettext ("Unknown DWARF debug section `%s'.\n"), @@ -7022,6 +7025,205 @@ print_debug_exception_table (Dwfl_Module *dwflmod __attribute__ ((unused)), } } +/* Print the content of the '.gdb_index' section. + http://sourceware.org/gdb/current/onlinedocs/gdb/Index-Section-Format.html +*/ +static void +print_gdb_index_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr, + Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg) +{ + printf (gettext ("\nGDB section [%2zu] '%s' at offset %#" PRIx64 + " contains %" PRId64 " bytes :\n"), + elf_ndxscn (scn), section_name (ebl, ehdr, shdr), + (uint64_t) shdr->sh_offset, (uint64_t) shdr->sh_size); + + Elf_Data *data = elf_rawdata (scn, NULL); + + if (unlikely (data == NULL)) + { + error (0, 0, gettext ("cannot get %s content: %s"), + ".gdb_index", elf_errmsg (-1)); + return; + } + + // .gdb_index is always in little endian. + Dwarf dummy_dbg = { .other_byte_order = MY_ELFDATA != ELFDATA2LSB }; + dbg = &dummy_dbg; + + const unsigned char *readp = data->d_buf; + const unsigned char *const dataend = readp + data->d_size; + + if (unlikely (readp + 4 > dataend)) + { + invalid_data: + error (0, 0, gettext ("invalid data")); + return; + } + + int32_t vers = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" Version: %" PRId32 "\n"), vers); + + // The only difference between version 4 and version 5 is the + // hash used for generating the table. + if (vers < 4 || vers > 5) + { + printf (gettext (" unknown version, cannot parse section\n")); + return; + } + + readp += 4; + if (unlikely (readp + 4 > dataend)) + goto invalid_data; + + uint32_t cu_off = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" CU offset: %#" PRIx32 "\n"), cu_off); + + readp += 4; + if (unlikely (readp + 4 > dataend)) + goto invalid_data; + + uint32_t tu_off = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" TU offset: %#" PRIx32 "\n"), tu_off); + + readp += 4; + if (unlikely (readp + 4 > dataend)) + goto invalid_data; + + uint32_t addr_off = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" address offset: %#" PRIx32 "\n"), addr_off); + + readp += 4; + if (unlikely (readp + 4 > dataend)) + goto invalid_data; + + uint32_t sym_off = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" symbol offset: %#" PRIx32 "\n"), sym_off); + + readp += 4; + if (unlikely (readp + 4 > dataend)) + goto invalid_data; + + uint32_t const_off = read_4ubyte_unaligned (dbg, readp); + printf (gettext (" constant offset: %#" PRIx32 "\n"), const_off); + + readp = data->d_buf + cu_off; + + const unsigned char *nextp = data->d_buf + tu_off; + size_t nr = (nextp - readp) / 16; + + printf (gettext ("\n CU list at offset %#" PRIx32 + " contains %zu entries:\n"), + cu_off, nr); + + size_t n = 0; + while (readp + 16 <= dataend && n < nr) + { + uint64_t off = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + uint64_t len = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + printf (" [%4zu] start: %0#8" PRIx64 + ", length: %5" PRIu64 "\n", n, off, len); + n++; + } + + readp = data->d_buf + tu_off; + nextp = data->d_buf + addr_off; + nr = (nextp - readp) / 24; + + printf (gettext ("\n TU list at offset %#" PRIx32 + " contains %zu entries:\n"), + tu_off, nr); + + n = 0; + while (readp + 24 <= dataend && n < nr) + { + uint64_t off = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + uint64_t type = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + uint64_t sig = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + printf (" [%4zu] CU offset: %5" PRId64 + ", type offset: %5" PRId64 + ", signature: %0#8" PRIx64 "\n", n, off, type, sig); + n++; + } + + readp = data->d_buf + addr_off; + nextp = data->d_buf + sym_off; + nr = (nextp - readp) / 20; + + printf (gettext ("\n Address list at offset %#" PRIx32 + " contains %zu entries:\n"), + addr_off, nr); + + n = 0; + while (readp + 20 <= dataend && n < nr) + { + uint64_t low = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + uint64_t high = read_8ubyte_unaligned (dbg, readp); + readp += 8; + + uint32_t idx = read_4ubyte_unaligned (dbg, readp); + readp += 4; + + char *l = format_dwarf_addr (dwflmod, 8, low); + char *h = format_dwarf_addr (dwflmod, 8, high - 1); + printf (" [%4zu] %s..%s, CU index: %5" PRId32 "\n", + n, l, h, idx); + n++; + } + + readp = data->d_buf + sym_off; + nextp = data->d_buf + const_off; + nr = (nextp - readp) / 8; + + printf (gettext ("\n Symbol table at offset %#" PRIx32 + " contains %zu slots:\n"), + addr_off, nr); + + n = 0; + while (readp + 8 <= dataend && n < nr) + { + uint32_t name = read_4ubyte_unaligned (dbg, readp); + readp += 4; + + uint32_t vector = read_4ubyte_unaligned (dbg, readp); + readp += 4; + + if (name != 0 || vector != 0) + { + const unsigned char *sym = data->d_buf + const_off + name; + if (unlikely (sym > dataend)) + goto invalid_data; + + printf (" [%4zu] symbol: %s, CUs: ", n, sym); + + const unsigned char *readcus = data->d_buf + const_off + vector; + if (unlikely (readcus + 8 > dataend)) + goto invalid_data; + + uint32_t cus = read_4ubyte_unaligned (dbg, readcus); + while (cus--) + { + uint32_t cu; + readcus += 4; + cu = read_4ubyte_unaligned (dbg, readcus); + printf ("%" PRId32 "%s", cu, ((cus > 0) ? ", " : "")); + } + printf ("\n"); + } + n++; + } +} static void print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr) @@ -7081,7 +7283,8 @@ print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr) { ".eh_frame_hdr", section_frame | section_exception, print_debug_frame_hdr_section }, { ".gcc_except_table", section_frame | section_exception, - print_debug_exception_table } + print_debug_exception_table }, + { ".gdb_index", section_gdb_index, print_gdb_index_section } }; const int ndebug_sections = (sizeof (debug_sections) / sizeof (debug_sections[0]));