diff options
Diffstat (limited to 'binutils/readelf.c')
| -rw-r--r-- | binutils/readelf.c | 326 |
1 files changed, 154 insertions, 172 deletions
diff --git a/binutils/readelf.c b/binutils/readelf.c index 67c4816..6604cad 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -6271,16 +6271,137 @@ process_extended_line_op (unsigned char *data, int is_stmt, int pointer_size) return len; } +/* Finds section NAME inside FILE and returns a + pointer to it, or NULL upon failure. */ + +static Elf_Internal_Shdr * +find_section (const char * name) +{ + Elf_Internal_Shdr *sec; + unsigned int i; + + for (i = elf_header.e_shnum, sec = section_headers + i - 1; + i; --i, --sec) + if (strcmp (SECTION_NAME (sec), name) == 0) + break; + + if (i && sec && sec->sh_size != 0) + return sec; + + return NULL; +} + /* Size of pointers in the .debug_line section. This information is not really present in that section. It's obtained before dumping the debug sections by doing some pre-scan of the .debug_info section. */ static unsigned int * debug_line_pointer_sizes = NULL; static unsigned int num_debug_line_pointer_sizes = 0; +/* Locate and scan the .debug_info section in the file and record the pointer + sizes for the compilation units in it. Usually an executable will have + just one pointer size, but this is not guaranteed, and so we try not to + make any assumptions. Returns zero upon failure, or the number of + compilation units upon success. */ + +static unsigned int +get_debug_line_pointer_sizes (FILE * file) +{ + Elf_Internal_Shdr * section; + unsigned char * start; + unsigned char * end; + unsigned char * begin; + unsigned long length; + unsigned int num_units; + unsigned int unit; + + section = find_section (".debug_info"); + if (section == NULL) + return 0; + + length = section->sh_size; + start = get_data (NULL, file, section->sh_offset, section->sh_size, + _("extracting pointer sizes from .debug_info section")); + if (start == NULL) + return 0; + + end = start + section->sh_size; + /* First scan the section to get the number of comp units. */ + for (begin = start, num_units = 0; begin < end; num_units++) + { + /* Read the first 4 bytes. For a 32-bit DWARF section, this will + be the length. For a 64-bit DWARF section, it'll be the escape + code 0xffffffff followed by an 8 byte length. */ + length = byte_get (begin, 4); + + if (length == 0xffffffff) + { + length = byte_get (begin + 4, 8); + begin += length + 12; + } + else + begin += length + 4; + } + + if (num_units == 0) + { + error (_("No comp units in .debug_info section ?")); + free (start); + return 0; + } + + /* Then allocate an array to hold the pointer sizes. */ + debug_line_pointer_sizes = malloc (num_units * sizeof * debug_line_pointer_sizes); + if (debug_line_pointer_sizes == NULL) + { + error (_("Not enough memory for a pointer size array of %u entries"), + num_units); + free (start); + return 0; + } + + /* Populate the array. */ + for (begin = start, unit = 0; begin < end; unit++) + { + length = byte_get (begin, 4); + if (length == 0xffffffff) + { + /* For 64-bit DWARF, the 1-byte address_size field is 22 bytes + from the start of the section. This is computed as follows: + + unit_length: 12 bytes + version: 2 bytes + debug_abbrev_offset: 8 bytes + ----------------------------- + Total: 22 bytes */ + + debug_line_pointer_sizes [unit] = byte_get (begin + 22, 1); + length = byte_get (begin + 4, 8); + begin += length + 12; + } + else + { + /* For 32-bit DWARF, the 1-byte address_size field is 10 bytes from + the start of the section: + + unit_length: 4 bytes + version: 2 bytes + debug_abbrev_offset: 4 bytes + ----------------------------- + Total: 10 bytes */ + + debug_line_pointer_sizes [unit] = byte_get (begin + 10, 1); + begin += length + 4; + } + } + + free (start); + num_debug_line_pointer_sizes = num_units; + return num_units; +} + static int display_debug_lines (Elf_Internal_Shdr *section, - unsigned char * start, - FILE *file ATTRIBUTE_UNUSED) + unsigned char *start, FILE *file) { unsigned char *hdrptr; DWARF2_Internal_LineInfo info; @@ -6296,6 +6417,9 @@ display_debug_lines (Elf_Internal_Shdr *section, printf (_("\nDump of debug contents of section %s:\n\n"), SECTION_NAME (section)); + if (num_debug_line_pointer_sizes == 0) + get_debug_line_pointer_sizes (file); + while (data < end) { unsigned int pointer_size; @@ -7506,20 +7630,14 @@ static void load_debug_loc (FILE *file) { Elf_Internal_Shdr *sec; - unsigned int i; /* If it is already loaded, do nothing. */ if (debug_loc_contents != NULL) return; /* Locate the .debug_loc section. */ - for (i = 0, sec = section_headers; - i < elf_header.e_shnum; - i++, sec++) - if (strcmp (SECTION_NAME (sec), ".debug_loc") == 0) - break; - - if (i == elf_header.e_shnum || sec->sh_size == 0) + sec = find_section (".debug_loc"); + if (sec == NULL) return; debug_loc_size = sec->sh_size; @@ -7542,8 +7660,7 @@ free_debug_loc (void) static int display_debug_loc (Elf_Internal_Shdr *section, - unsigned char *start, - FILE *file ATTRIBUTE_UNUSED) + unsigned char *start, FILE *file) { unsigned char *section_end; unsigned long bytes; @@ -7561,6 +7678,9 @@ display_debug_loc (Elf_Internal_Shdr *section, return 0; } + if (num_debug_line_pointer_sizes == 0) + get_debug_line_pointer_sizes (file); + printf (_("Contents of the .debug_loc section:\n\n")); printf (_("\n Offset Begin End Expression\n")); @@ -7625,20 +7745,14 @@ static void load_debug_str (FILE *file) { Elf_Internal_Shdr *sec; - unsigned int i; /* If it is already loaded, do nothing. */ if (debug_str_contents != NULL) return; /* Locate the .debug_str section. */ - for (i = 0, sec = section_headers; - i < elf_header.e_shnum; - i++, sec++) - if (strcmp (SECTION_NAME (sec), ".debug_str") == 0) - break; - - if (i == elf_header.e_shnum || sec->sh_size == 0) + sec = find_section (".debug_str"); + if (sec == NULL) return; debug_str_size = sec->sh_size; @@ -8100,7 +8214,6 @@ display_debug_info (Elf_Internal_Shdr *section, unsigned char *hdrptr; unsigned char *cu_abbrev_offset_ptr; unsigned char *tags; - unsigned int i; int level; unsigned long cu_offset; int offset_size; @@ -8224,13 +8337,8 @@ display_debug_info (Elf_Internal_Shdr *section, unsigned char *begin; /* Locate the .debug_abbrev section and process it. */ - for (i = 0, sec = section_headers; - i < elf_header.e_shnum; - i++, sec++) - if (strcmp (SECTION_NAME (sec), ".debug_abbrev") == 0) - break; - - if (i == elf_header.e_shnum || sec->sh_size == 0) + sec = find_section (".debug_abbrev"); + if (sec == NULL) { warn (_("Unable to locate .debug_abbrev section!\n")); return 0; @@ -9194,121 +9302,31 @@ display_debug_not_supported (Elf_Internal_Shdr *section, return 1; } -/* Pre-scan the .debug_info section to record the pointer sizes for the - compilation units. Usually an executable will have just one pointer - size, but this is not guaranteed, and so we try not to make any - assumptions. Returns zero upon failure, or the number of compilation - units upon success. */ - -static unsigned int -prescan_debug_info (Elf_Internal_Shdr *section, unsigned char *start, - FILE *file ATTRIBUTE_UNUSED) -{ - unsigned char *begin; - unsigned char *end = start + section->sh_size; - unsigned long length; - unsigned int num_units; - unsigned int unit; - - /* First scan the section to compute the number of comp units. */ - for (begin = start, num_units = 0; begin < end; num_units++) - { - /* Read the first 4 bytes. For a 32-bit DWARF section, this will - be the length. For a 64-bit DWARF section, it'll be the escape - code 0xffffffff followed by an 8 byte length. */ - length = byte_get (begin, 4); - - if (length == 0xffffffff) - { - length = byte_get (begin + 4, 8); - begin += length + 12; - } - else - begin += length + 4; - } - - if (num_units == 0) - { - error (_("No comp units in .debug_info section ?")); - return 0; - } - - /* Then allocate an array to hold the pointer sizes. */ - debug_line_pointer_sizes = malloc (num_units * sizeof * debug_line_pointer_sizes); - if (debug_line_pointer_sizes == NULL) - { - error (_("Not enough memory for a pointer size array of %u entries"), - num_units); - return 0; - } - - /* Populate the array. */ - for (begin = start, unit = 0; begin < end; unit++) - { - length = byte_get (begin, 4); - if (length == 0xffffffff) - { - /* For 64-bit DWARF, the 1-byte address_size field is 22 bytes - from the start of the section. This is computed as follows: - - unit_length: 12 bytes - version: 2 bytes - debug_abbrev_offset: 8 bytes - ----------------------------- - Total: 22 bytes */ - - debug_line_pointer_sizes [unit] = byte_get (begin + 22, 1); - length = byte_get (begin + 4, 8); - begin += length + 12; - } - else - { - /* For 32-bit DWARF, the 1-byte address_size field is 10 bytes from - the start of the section: - - unit_length: 4 bytes - version: 2 bytes - debug_abbrev_offset: 4 bytes - ----------------------------- - Total: 10 bytes */ - - debug_line_pointer_sizes [unit] = byte_get (begin + 10, 1); - begin += length + 4; - } - } - - num_debug_line_pointer_sizes = num_units; - return num_units; -} - -/* A structure containing the name of a debug section and a pointer - to a function that can decode it. The third field is a prescan - function to be run over the section before displaying any of the - sections. */ +/* A structure containing the name of a debug section + and a pointer to a function that can decode it. */ struct { const char *const name; int (*display) (Elf_Internal_Shdr *, unsigned char *, FILE *); - int (*prescan) (Elf_Internal_Shdr *, unsigned char *, FILE *); } debug_displays[] = { - { ".debug_abbrev", display_debug_abbrev, NULL }, - { ".debug_aranges", display_debug_aranges, NULL }, - { ".debug_frame", display_debug_frames, NULL }, - { ".debug_info", display_debug_info, prescan_debug_info }, - { ".debug_line", display_debug_lines, NULL }, - { ".debug_pubnames", display_debug_pubnames, NULL }, - { ".eh_frame", display_debug_frames, NULL }, - { ".debug_macinfo", display_debug_macinfo, NULL }, - { ".debug_str", display_debug_str, NULL }, - { ".debug_loc", display_debug_loc, NULL }, - { ".debug_pubtypes", display_debug_not_supported, NULL }, - { ".debug_ranges", display_debug_not_supported, NULL }, - { ".debug_static_func", display_debug_not_supported, NULL }, - { ".debug_static_vars", display_debug_not_supported, NULL }, - { ".debug_types", display_debug_not_supported, NULL }, - { ".debug_weaknames", display_debug_not_supported, NULL } + { ".debug_abbrev", display_debug_abbrev }, + { ".debug_aranges", display_debug_aranges }, + { ".debug_frame", display_debug_frames }, + { ".debug_info", display_debug_info }, + { ".debug_line", display_debug_lines }, + { ".debug_pubnames", display_debug_pubnames }, + { ".eh_frame", display_debug_frames }, + { ".debug_macinfo", display_debug_macinfo }, + { ".debug_str", display_debug_str }, + { ".debug_loc", display_debug_loc }, + { ".debug_pubtypes", display_debug_not_supported }, + { ".debug_ranges", display_debug_not_supported }, + { ".debug_static_func", display_debug_not_supported }, + { ".debug_static_vars", display_debug_not_supported }, + { ".debug_types", display_debug_not_supported }, + { ".debug_weaknames", display_debug_not_supported } }; static int @@ -9363,42 +9381,6 @@ process_section_contents (FILE *file) if (! do_dump) return 1; - /* Pre-scan the debug sections to find some debug information not - present in some of them. For the .debug_line, we must find out the - size of address (specified in .debug_info and .debug_aranges). */ - for (i = 0, section = section_headers; - i < elf_header.e_shnum && i < num_dump_sects; - i++, section++) - { - char *name = SECTION_NAME (section); - int j; - - if (section->sh_size == 0) - continue; - - /* See if there is some pre-scan operation for this section. */ - for (j = NUM_ELEM (debug_displays); j--;) - if (strcmp (debug_displays[j].name, name) == 0) - { - if (debug_displays[j].prescan != NULL) - { - bfd_size_type length; - unsigned char *start; - - length = section->sh_size; - start = get_data (NULL, file, section->sh_offset, length, - _("debug section data")); - if (!start) - return 0; - - debug_displays[j].prescan (section, start, file); - free (start); - } - - break; - } - } - for (i = 0, section = section_headers; i < elf_header.e_shnum && i < num_dump_sects; i++, section++) |