2007-07-09 Roland McGrath <roland@redhat.com>
* elf-bfd.h (struct elf_obj_tdata): Add members emit_note_gnu_build_id and note_gnu_build_id_sec. * elf.c (_bfd_id_note_section_size): New global function. (read_hex, _bfd_elf_write_build_id_section): New static functions. (_bfd_elf_write_object_contents): Call _bfd_elf_write_build_id_section if emit_note_gnu_build_id is set. * Makefile.am (elf.lo): Update dependencies.
This commit is contained in:
Roland McGrath
parent
20a761b5e9
commit
ff59fc360e
@ -1298,7 +1298,8 @@ efi-app-ia32.lo: efi-app-ia32.c $(INCDIR)/filenames.h \
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peicode.h libpei.h
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elf.lo: elf.c $(INCDIR)/filenames.h $(INCDIR)/bfdlink.h \
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$(INCDIR)/hashtab.h elf-bfd.h $(INCDIR)/elf/common.h \
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$(INCDIR)/elf/internal.h $(INCDIR)/elf/external.h $(INCDIR)/libiberty.h
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$(INCDIR)/elf/internal.h $(INCDIR)/elf/external.h $(INCDIR)/libiberty.h \
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$(INCDIR)/safe-ctype.h $(INCDIR)/md5.h
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elf32-am33lin.lo: elf32-am33lin.c $(INCDIR)/filenames.h \
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elf-bfd.h $(INCDIR)/elf/common.h $(INCDIR)/elf/internal.h \
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$(INCDIR)/elf/external.h $(INCDIR)/bfdlink.h $(INCDIR)/elf/mn10300.h \
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156
bfd/elf.c
156
bfd/elf.c
@ -42,6 +42,8 @@ SECTION
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#define ARCH_SIZE 0
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#include "elf-bfd.h"
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#include "libiberty.h"
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#include "safe-ctype.h"
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#include "md5.h"
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static int elf_sort_sections (const void *, const void *);
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static bfd_boolean assign_file_positions_except_relocs (bfd *, struct bfd_link_info *);
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@ -5073,6 +5075,149 @@ _bfd_elf_assign_file_positions_for_relocs (bfd *abfd)
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elf_tdata (abfd)->next_file_pos = off;
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}
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bfd_size_type
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_bfd_id_note_section_size (bfd *abfd, struct bfd_link_info *link_info)
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{
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const char *style = link_info->emit_note_gnu_build_id;
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bfd_size_type size;
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abfd = abfd;
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size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
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size = BFD_ALIGN (size, 4);
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if (!strcmp (style, "md5") || !strcmp (style, "uuid"))
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size += 128 / 8;
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#if 0 /* libiberty has md5 but not sha1 */
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else if (!strcmp (style, "sha1"))
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size += 160 / 8;
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#endif
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else if (!strncmp (style, "0x", 2))
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{
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/* ID is in string form (hex). Convert to bits. */
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const char *id = style + 2;
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do
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{
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if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
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{
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++size;
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id += 2;
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}
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else if (*id == '-' || *id == ':')
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++id;
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else
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{
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size = 0;
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break;
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}
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} while (*id != '\0');
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}
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else
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size = 0;
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return size;
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}
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static unsigned char
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read_hex (const char xdigit)
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{
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if (ISDIGIT (xdigit))
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return xdigit - '0';
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if (ISUPPER (xdigit))
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return xdigit - 'A' + 0xa;
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if (ISLOWER (xdigit))
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return xdigit - 'a' + 0xa;
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abort ();
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return 0;
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}
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static bfd_boolean
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_bfd_elf_write_build_id_section (bfd *abfd, const char *style)
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{
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const struct elf_backend_data *bed = get_elf_backend_data (abfd);
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asection *asec;
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Elf_Internal_Shdr *i_shdr;
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unsigned char *contents, *id_bits;
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bfd_size_type size;
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Elf_External_Note *e_note;
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asec = elf_tdata (abfd)->note_gnu_build_id_sec;
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if (asec->output_section == NULL)
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{
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_bfd_error_handler (_(".note.gnu.build-id section missing"));
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return FALSE;
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}
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i_shdr = &elf_section_data (asec->output_section)->this_hdr;
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if (i_shdr->contents == NULL)
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{
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BFD_ASSERT (asec->output_offset == 0);
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i_shdr->contents = bfd_zalloc (abfd, i_shdr->sh_size);
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if (i_shdr->contents == NULL)
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return FALSE;
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}
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contents = i_shdr->contents + asec->output_offset;
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e_note = (void *) contents;
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size = offsetof (Elf_External_Note, name[sizeof "GNU"]);
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size = BFD_ALIGN (size, 4);
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id_bits = contents + size;
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size = asec->size - size;
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bfd_h_put_32 (abfd, sizeof "GNU", &e_note->namesz);
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bfd_h_put_32 (abfd, size, &e_note->descsz);
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bfd_h_put_32 (abfd, NT_GNU_BUILD_ID, &e_note->type);
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memcpy (e_note->name, "GNU", sizeof "GNU");
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if (!strcmp (style, "md5"))
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{
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struct md5_ctx ctx;
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md5_init_ctx (&ctx);
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if (bed->s->checksum_contents (abfd,
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(void (*) (const void *, size_t, void *))
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&md5_process_bytes,
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&ctx))
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md5_finish_ctx (&ctx, id_bits);
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else
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return FALSE;
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}
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else if (!strcmp (style, "uuid"))
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{
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int n;
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int fd = open ("/dev/urandom", O_RDONLY);
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if (fd < 0)
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return FALSE;
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n = read (fd, id_bits, size);
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close (fd);
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if (n < (int) size)
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return FALSE;
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}
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else if (!strncmp (style, "0x", 2))
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{
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/* ID is in string form (hex). Convert to bits. */
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const char *id = style + 2;
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size_t n = 0;
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do
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{
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if (ISXDIGIT (id[0]) && ISXDIGIT (id[1]))
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{
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id_bits[n] = read_hex (*id++) << 4;
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id_bits[n++] |= read_hex (*id++);
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}
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else if (*id == '-' || *id == ':')
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++id;
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else
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abort (); /* Should have been validated earlier. */
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} while (*id != '\0');
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}
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else
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abort (); /* Should have been validated earlier. */
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size = i_shdr->sh_size;
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return (bfd_seek (abfd, i_shdr->sh_offset, SEEK_SET) == 0
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&& bfd_bwrite (i_shdr->contents, size, abfd) == size);
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}
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bfd_boolean
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_bfd_elf_write_object_contents (bfd *abfd)
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{
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@ -5081,6 +5226,7 @@ _bfd_elf_write_object_contents (bfd *abfd)
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Elf_Internal_Shdr **i_shdrp;
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bfd_boolean failed;
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unsigned int count, num_sec;
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char *id_style;
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if (! abfd->output_has_begun
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&& ! _bfd_elf_compute_section_file_positions (abfd, NULL))
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@ -5124,7 +5270,15 @@ _bfd_elf_write_object_contents (bfd *abfd)
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(*bed->elf_backend_final_write_processing) (abfd,
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elf_tdata (abfd)->linker);
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return bed->s->write_shdrs_and_ehdr (abfd);
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if (!bed->s->write_shdrs_and_ehdr (abfd))
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return FALSE;
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/* This is last since write_shdrs_and_ehdr can touch i_shdrp[0]. */
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id_style = elf_tdata (abfd)->emit_note_gnu_build_id;
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if (id_style && !_bfd_elf_write_build_id_section (abfd, id_style))
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return FALSE;
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return TRUE;
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}
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bfd_boolean
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