From: Nick Clifton Date: Thu, 26 Jun 2003 12:46:17 +0000 (+0000) Subject: Fix computation of offsets in PT_LOAD sections. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d93f0186ba5c2d134603dc0e001ce0c9fcb3465b;p=binutils-gdb.git Fix computation of offsets in PT_LOAD sections. --- diff --git a/binutils/ChangeLog b/binutils/ChangeLog index d6ca2f0d816..5b0120265ee 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,19 @@ +2003-06-26 Roland McGrath + + * readelf.c (loadaddr): Variable removed. + (dynamic_info, version_info): Fix type long -> bfd_vma. + (program_headers): New variable. + (get_program_headers): New function, broken out of + process_program_headers. + (process_program_headers): Call it. Don't set `loadaddr'. + (slurp_ia64_unwind_table): Use get_program_headers. + (process_corefile_note_segments): Likewise. + (offset_from_vma): New function. + (process_relocs, process_dynamic_segment): Call that instead of + subtracting `loadaddr'. + (process_version_sections, process_symbol_table): Likewise. + (process_mips_specific): Likewise. + 2003-06-26 Nick Clifton * objcopy (enum strip_action): Add STRIP_NONDEBUG. diff --git a/binutils/readelf.c b/binutils/readelf.c index 42dd18d3f49..f5a8824faf5 100644 --- a/binutils/readelf.c +++ b/binutils/readelf.c @@ -106,11 +106,11 @@ Elf_Internal_Syminfo *dynamic_syminfo; unsigned long dynamic_syminfo_offset; unsigned int dynamic_syminfo_nent; char program_interpreter[64]; -long dynamic_info[DT_JMPREL + 1]; -long version_info[16]; -long loadaddr = 0; +bfd_vma dynamic_info[DT_JMPREL + 1]; +bfd_vma version_info[16]; Elf_Internal_Ehdr elf_header; Elf_Internal_Shdr *section_headers; +Elf_Internal_Phdr *program_headers; Elf_Internal_Dyn *dynamic_segment; Elf_Internal_Shdr *symtab_shndx_hdr; int show_name; @@ -282,6 +282,8 @@ static int get_32bit_program_headers PARAMS ((FILE *, Elf_Internal_Phdr *)); static int get_64bit_program_headers PARAMS ((FILE *, Elf_Internal_Phdr *)); +static int get_program_headers + PARAMS ((FILE *)); static int get_file_header PARAMS ((FILE *)); static Elf_Internal_Sym *get_32bit_elf_symbols @@ -296,6 +298,8 @@ static int get_32bit_dynamic_segment PARAMS ((FILE *)); static int get_64bit_dynamic_segment PARAMS ((FILE *)); +static long offset_from_vma + PARAMS ((FILE *, bfd_vma vma, bfd_size_type size)); #ifdef SUPPORT_DISASSEMBLY static int disassemble_section PARAMS ((Elf_Internal_Shdr *, FILE *)); @@ -3179,13 +3183,45 @@ get_64bit_program_headers (file, program_headers) return 1; } +/* Returns 1 if the program headers were read into `program_headers'. */ + +static int +get_program_headers (file) + FILE *file; +{ + Elf_Internal_Phdr *phdrs; + + /* Check cache of prior read. */ + if (program_headers != NULL) + return 1; + + phdrs = (Elf_Internal_Phdr *) malloc + (elf_header.e_phnum * sizeof (Elf_Internal_Phdr)); + + if (phdrs == NULL) + { + error (_("Out of memory\n")); + return 0; + } + + if (is_32bit_elf + ? get_32bit_program_headers (file, phdrs) + : get_64bit_program_headers (file, phdrs)) + { + program_headers = phdrs; + return 1; + } + + free (phdrs); + return 0; +} + /* Returns 1 if the program headers were loaded. */ static int process_program_headers (file) FILE *file; { - Elf_Internal_Phdr *program_headers; Elf_Internal_Phdr *segment; unsigned int i; @@ -3207,25 +3243,8 @@ process_program_headers (file) printf ("\n"); } - program_headers = (Elf_Internal_Phdr *) malloc - (elf_header.e_phnum * sizeof (Elf_Internal_Phdr)); - - if (program_headers == NULL) - { - error (_("Out of memory\n")); + if (! get_program_headers (file)) return 0; - } - - if (is_32bit_elf) - i = get_32bit_program_headers (file, program_headers); - else - i = get_64bit_program_headers (file, program_headers); - - if (i == 0) - { - free (program_headers); - return 0; - } if (do_segments) { @@ -3249,7 +3268,6 @@ process_program_headers (file) } } - loadaddr = -1; dynamic_addr = 0; dynamic_size = 0; @@ -3337,18 +3355,6 @@ process_program_headers (file) switch (segment->p_type) { - case PT_LOAD: - if (loadaddr == -1) - { - unsigned long align_mask = -segment->p_align; - - if (align_mask == 0) - --align_mask; - loadaddr = ((segment->p_vaddr & align_mask) - - (segment->p_offset & align_mask)); - } - break; - case PT_DYNAMIC: if (dynamic_addr) error (_("more than one dynamic segment\n")); @@ -3376,12 +3382,6 @@ process_program_headers (file) putc ('\n', stdout); } - if (loadaddr == -1) - { - /* Very strange. */ - loadaddr = 0; - } - if (do_segments && section_headers != NULL) { printf (_("\n Section to Segment mapping:\n")); @@ -3418,12 +3418,44 @@ process_program_headers (file) } } - free (program_headers); - return 1; } +/* Find the file offset corresponding to VMA by using the program headers. */ + +static long +offset_from_vma (file, vma, size) + FILE *file; + bfd_vma vma; + bfd_size_type size; +{ + Elf_Internal_Phdr *seg; + + if (! get_program_headers (file)) + { + warn (_("Cannot interpret virtual addresses without program headers.\n")); + return (long) vma; + } + + for (seg = program_headers; + seg < program_headers + elf_header.e_phnum; + ++seg) + { + if (seg->p_type != PT_LOAD) + continue; + + if (vma >= (seg->p_vaddr & -seg->p_align) + && vma + size <= seg->p_vaddr + seg->p_filesz) + return vma - seg->p_vaddr + seg->p_offset; + } + + warn (_("Virtual address 0x%lx not located in any PT_LOAD segment.\n"), + (long) vma); + return (long) vma; +} + + static int get_32bit_section_headers (file, num) FILE *file; @@ -3996,7 +4028,9 @@ process_relocs (file) (_("\n'%s' relocation section at offset 0x%lx contains %ld bytes:\n"), name, rel_offset, rel_size); - dump_relocations (file, rel_offset - loadaddr, rel_size, + dump_relocations (file, + offset_from_vma (file, rel_offset, rel_size), + rel_size, dynamic_symbols, num_dynamic_syms, dynamic_strings, is_rela); } @@ -4222,14 +4256,13 @@ slurp_ia64_unwind_table (file, aux, sec) Elf_Internal_Shdr *sec; { unsigned long size, addr_size, nrelas, i; - Elf_Internal_Phdr *prog_hdrs, *seg; + Elf_Internal_Phdr *seg; struct unw_table_entry *tep; Elf_Internal_Shdr *relsec; Elf_Internal_Rela *rela, *rp; unsigned char *table, *tp; Elf_Internal_Sym *sym; const char *relname; - int result; addr_size = is_32bit_elf ? 4 : 8; @@ -4238,21 +4271,12 @@ slurp_ia64_unwind_table (file, aux, sec) if (elf_header.e_phnum) { - prog_hdrs = (Elf_Internal_Phdr *) - xmalloc (elf_header.e_phnum * sizeof (Elf_Internal_Phdr)); - - if (is_32bit_elf) - result = get_32bit_program_headers (file, prog_hdrs); - else - result = get_64bit_program_headers (file, prog_hdrs); - - if (!result) - { - free (prog_hdrs); + if (! get_program_headers (file)) return 0; - } - for (seg = prog_hdrs; seg < prog_hdrs + elf_header.e_phnum; ++seg) + for (seg = program_headers; + seg < program_headers + elf_header.e_phnum; + ++seg) { if (seg->p_type != PT_LOAD) continue; @@ -4264,8 +4288,6 @@ slurp_ia64_unwind_table (file, aux, sec) break; } } - - free (prog_hdrs); } /* Second, build the unwind table from the contents of the unwind section: */ @@ -4818,7 +4840,7 @@ process_dynamic_segment (file) we default to reading in the entire file (!) and processing that. This is overkill, I know, but it should work. */ - section.sh_offset = entry->d_un.d_val - loadaddr; + section.sh_offset = offset_from_vma (file, entry->d_un.d_val, 0); if (fseek (file, 0, SEEK_END)) error (_("Unable to seek to end of file!")); @@ -4860,7 +4882,7 @@ process_dynamic_segment (file) processing that. This is overkill, I know, but it should work. */ - offset = entry->d_un.d_val - loadaddr; + offset = offset_from_vma (file, entry->d_un.d_val, 0); if (fseek (file, 0, SEEK_END)) error (_("Unable to seek to end of file\n")); str_tab_len = ftell (file) - offset; @@ -4896,7 +4918,8 @@ process_dynamic_segment (file) else if (entry->d_tag == DT_SYMINSZ) syminsz = entry->d_un.d_val; else if (entry->d_tag == DT_SYMINFO) - dynamic_syminfo_offset = entry->d_un.d_val - loadaddr; + dynamic_syminfo_offset = offset_from_vma (file, entry->d_un.d_val, + syminsz); } if (dynamic_syminfo_offset != 0 && syminsz != 0) @@ -5585,7 +5608,9 @@ process_version_sections (file) edata = ((unsigned char *) get_data (NULL, file, - version_info[DT_VERSIONTAGIDX (DT_VERSYM)] - loadaddr, + offset_from_vma + (file, version_info[DT_VERSIONTAGIDX (DT_VERSYM)], + total * sizeof (short)), total * sizeof (short), _("version symbol data"))); if (!edata) { @@ -5641,8 +5666,9 @@ process_version_sections (file) Elf_Internal_Verneed ivn; unsigned long offset; - offset = version_info[DT_VERSIONTAGIDX (DT_VERNEED)] - - loadaddr; + offset = offset_from_vma + (file, version_info[DT_VERSIONTAGIDX (DT_VERNEED)], + sizeof (Elf_External_Verneed)); do { @@ -5697,8 +5723,9 @@ process_version_sections (file) Elf_External_Verdef evd; unsigned long offset; - offset = (version_info[DT_VERSIONTAGIDX (DT_VERDEF)] - - loadaddr); + offset = offset_from_vma + (file, version_info[DT_VERSIONTAGIDX (DT_VERDEF)], + sizeof evd); do { @@ -5925,7 +5952,9 @@ process_symbol_table (file) if (dynamic_info[DT_HASH] && ((do_using_dynamic && dynamic_strings != NULL) || do_histogram)) { - if (fseek (file, dynamic_info[DT_HASH] - loadaddr, SEEK_SET)) + if (fseek (file, offset_from_vma (file, dynamic_info[DT_HASH], + sizeof nb + sizeof nc), + SEEK_SET)) { error (_("Unable to seek to start of dynamic information")); return 0; @@ -6056,8 +6085,9 @@ process_symbol_table (file) int is_nobits; int check_def; - offset = version_info[DT_VERSIONTAGIDX (DT_VERSYM)] - - loadaddr; + offset = offset_from_vma + (file, version_info[DT_VERSIONTAGIDX (DT_VERSYM)], + sizeof data + si * sizeof (vers_data)); get_data (&data, file, offset + si * sizeof (vers_data), sizeof (data), _("version data")); @@ -6079,8 +6109,9 @@ process_symbol_table (file) Elf_Internal_Vernaux ivna; /* We must test both. */ - offset = (version_info[DT_VERSIONTAGIDX (DT_VERNEED)] - - loadaddr); + offset = offset_from_vma + (file, version_info[DT_VERSIONTAGIDX (DT_VERNEED)], + sizeof evn); do { @@ -6140,9 +6171,10 @@ process_symbol_table (file) Elf_External_Verdaux evda; unsigned long offset; - offset - = (version_info[DT_VERSIONTAGIDX (DT_VERDEF)] - - loadaddr); + offset = offset_from_vma + (file, + version_info[DT_VERSIONTAGIDX (DT_VERDEF)], + sizeof (Elf_External_Verdef)); do { @@ -9733,16 +9765,20 @@ process_mips_specific (file) switch (entry->d_tag) { case DT_MIPS_LIBLIST: - liblist_offset = entry->d_un.d_val - loadaddr; + liblist_offset + = offset_from_vma (file, entry->d_un.d_val, + liblistno * sizeof (Elf32_External_Lib)); break; case DT_MIPS_LIBLISTNO: liblistno = entry->d_un.d_val; break; case DT_MIPS_OPTIONS: - options_offset = entry->d_un.d_val - loadaddr; + options_offset = offset_from_vma (file, entry->d_un.d_val, 0); break; case DT_MIPS_CONFLICT: - conflicts_offset = entry->d_un.d_val - loadaddr; + conflicts_offset + = offset_from_vma (file, entry->d_un.d_val, + conflictsno * sizeof (Elf32_External_Conflict)); break; case DT_MIPS_CONFLICTNO: conflictsno = entry->d_un.d_val; @@ -10394,30 +10430,12 @@ static int process_corefile_note_segments (file) FILE *file; { - Elf_Internal_Phdr *program_headers; Elf_Internal_Phdr *segment; unsigned int i; int res = 1; - program_headers = (Elf_Internal_Phdr *) malloc - (elf_header.e_phnum * sizeof (Elf_Internal_Phdr)); - - if (program_headers == NULL) - { - error (_("Out of memory\n")); + if (! get_program_headers (file)) return 0; - } - - if (is_32bit_elf) - i = get_32bit_program_headers (file, program_headers); - else - i = get_64bit_program_headers (file, program_headers); - - if (i == 0) - { - free (program_headers); - return 0; - } for (i = 0, segment = program_headers; i < elf_header.e_phnum; @@ -10429,8 +10447,6 @@ process_corefile_note_segments (file) (bfd_vma) segment->p_filesz); } - free (program_headers); - return res; } @@ -10647,6 +10663,12 @@ process_file (file_name) fclose (file); + if (program_headers) + { + free (program_headers); + program_headers = NULL; + } + if (section_headers) { free (section_headers);