* som.c (som_write_fixups): New function.
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Jeff Law
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aff9779048
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2 changed files with 257 additions and 1 deletions
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@ -1,6 +1,7 @@
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Sat Nov 13 15:27:15 1993 Jeffrey A. Law (law@snake.cs.utah.edu)
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* som.c (som_prep_for_fixups): New function.
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(som_write_fixups): New function.
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Fri Nov 12 15:29:36 1993 Jeffrey A. Law (law@snake.cs.utah.edu)
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257
bfd/som.c
257
bfd/som.c
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@ -67,6 +67,12 @@
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((__m_num) >= _PA_RISC1_1_ID && (__m_num) <= _PA_RISC_MAXID))
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#endif /* _PA_RISC_ID */
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/* Size (in chars) of the temporary buffers used during fixup and string
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table writes. */
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#define SOM_TMP_BUFSIZE 8192
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/* SOM allows any one of the four previous relocations to be reused
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with a "R_PREV_FIXUP" relocation entry. Since R_PREV_FIXUP
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relocations are always a single byte, using a R_PREV_FIXUP instead
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@ -162,7 +168,7 @@ static int som_sizeof_headers PARAMS ((bfd *, boolean));
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static boolean som_write_headers PARAMS ((bfd *));
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static boolean som_build_and_write_symbol_table PARAMS ((bfd *));
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static void som_prep_for_fixups PARAMS ((bfd *, asymbol **, unsigned long));
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static boolean som_write_fixups PARAMS ((bfd *, unsigned long, unsigned int *));
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static reloc_howto_type som_hppa_howto_table[] =
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{
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@ -1540,6 +1546,255 @@ som_prep_for_fixups (abfd, syms, num_syms)
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}
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}
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static boolean
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som_write_fixups (abfd, current_offset, total_reloc_sizep)
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bfd *abfd;
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unsigned long current_offset;
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unsigned int *total_reloc_sizep;
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{
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unsigned int i, j;
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unsigned char *tmp_space, *p;
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unsigned int total_reloc_size = 0;
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unsigned int subspace_reloc_size = 0;
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unsigned int num_spaces = obj_som_file_hdr (abfd)->space_total;
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asection *section = abfd->sections;
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/* Get a chunk of memory that we can use as buffer space, then throw
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away. */
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tmp_space = alloca (SOM_TMP_BUFSIZE);
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bzero (tmp_space, SOM_TMP_BUFSIZE);
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p = tmp_space;
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/* All the fixups for a particular subspace are emitted in a single
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stream. All the subspaces for a particular space are emitted
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as a single stream.
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So, to get all the locations correct one must iterate through all the
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spaces, for each space iterate through its subspaces and output a
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fixups stream. */
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for (i = 0; i < num_spaces; i++)
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{
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asection *subsection;
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/* Find a space. */
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while (som_section_data (section)->is_space == 0)
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section = section->next;
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/* Now iterate through each of its subspaces. */
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for (subsection = abfd->sections;
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subsection != NULL;
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subsection = subsection->next)
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{
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int reloc_offset;
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/* Find a subspace of this space. */
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if (som_section_data (subsection)->is_subspace == 0
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|| som_section_data (subsection)->containing_space != section)
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continue;
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/* If this subspace had no relocations, then we're finished
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with it. */
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if (subsection->reloc_count <= 0)
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{
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som_section_data (subsection)->subspace_dict.fixup_request_index
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= -1;
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continue;
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}
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/* This subspace has some relocations. Put the relocation stream
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index into the subspace record. */
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som_section_data (subsection)->subspace_dict.fixup_request_index
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= total_reloc_size;
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/* To make life easier start over with a clean slate for
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each subspace. Seek to the start of the relocation stream
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for this subspace in preparation for writing out its fixup
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stream. */
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if (bfd_seek (abfd, current_offset + total_reloc_size, SEEK_SET) != 0)
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{
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bfd_error = system_call_error;
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return false;
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}
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/* Buffer space has already been allocated. Just perform some
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initialization here. */
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p = tmp_space;
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subspace_reloc_size = 0;
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reloc_offset = 0;
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som_initialize_reloc_queue (reloc_queue);
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/* Translate each BFD relocation into one or more SOM
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relocations. */
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for (j = 0; j < subsection->reloc_count; j++)
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{
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arelent *bfd_reloc = subsection->orelocation[j];
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unsigned int skip;
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int sym_num;
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/* Get the symbol number. Remember it's stored in a
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special place for section symbols. */
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if ((*bfd_reloc->sym_ptr_ptr)->flags & BSF_SECTION_SYM)
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sym_num = (int) (*bfd_reloc->sym_ptr_ptr)->udata;
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else
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sym_num = (*som_symbol_data ((*bfd_reloc->sym_ptr_ptr)))->index;
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/* If there is not enough room for the next couple relocations,
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then dump the current buffer contents now. Also reinitialize
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the relocation queue.
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FIXME. We assume here that no BFD relocation will expand
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to more than 100 bytes of SOM relocations. This should (?!?)
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be quite safe. */
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if (p - tmp_space + 100 > SOM_TMP_BUFSIZE)
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{
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if (bfd_write ((PTR) tmp_space, p - tmp_space, 1, abfd)
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!= p - tmp_space)
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{
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bfd_error = system_call_error;
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return false;
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}
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p = tmp_space;
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som_initialize_reloc_queue (reloc_queue);
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}
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/* Emit R_NO_RELOCATION fixups to map any bytes which were
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skipped. */
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skip = bfd_reloc->address - reloc_offset;
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p = som_reloc_skip (abfd, skip, p,
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&subspace_reloc_size, reloc_queue);
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/* Update reloc_offset for the next iteration.
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Note R_ENTRY and R_EXIT relocations are just markers,
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they do not consume input bytes. */
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if (bfd_reloc->howto->type != R_ENTRY
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&& bfd_reloc->howto->type != R_EXIT)
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reloc_offset = bfd_reloc->address + 4;
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else
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reloc_offset = bfd_reloc->address;
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/* Now the actual relocation we care about. */
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switch (bfd_reloc->howto->type)
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{
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case R_PCREL_CALL:
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case R_ABS_CALL:
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p = som_reloc_call (abfd, p, &subspace_reloc_size,
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bfd_reloc, sym_num, reloc_queue);
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break;
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case R_CODE_ONE_SYMBOL:
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case R_DP_RELATIVE:
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/* Account for any addend. */
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if (bfd_reloc->addend)
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p = som_reloc_addend (abfd, bfd_reloc->addend, p,
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&subspace_reloc_size, reloc_queue);
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if (sym_num < 0x20)
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{
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bfd_put_8 (abfd, bfd_reloc->howto->type + sym_num, p);
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subspace_reloc_size += 1;
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p += 1;
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}
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else if (sym_num < 0x100)
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{
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bfd_put_8 (abfd, bfd_reloc->howto->type + 32, p);
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bfd_put_8 (abfd, sym_num, p + 1);
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p = try_prev_fixup (abfd, &subspace_reloc_size, p,
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2, reloc_queue);
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}
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else if (sym_num < 0x10000000)
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{
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bfd_put_8 (abfd, bfd_reloc->howto->type + 33, p);
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bfd_put_8 (abfd, sym_num >> 16, p + 1);
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bfd_put_16 (abfd, sym_num, p + 2);
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p = try_prev_fixup (abfd, &subspace_reloc_size,
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p, 4, reloc_queue);
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}
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else
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abort ();
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break;
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case R_DATA_ONE_SYMBOL:
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case R_DATA_PLABEL:
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case R_CODE_PLABEL:
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/* Account for any addend. */
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if (bfd_reloc->addend)
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p = som_reloc_addend (abfd, bfd_reloc->addend, p,
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&subspace_reloc_size, reloc_queue);
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if (sym_num < 0x100)
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{
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bfd_put_8 (abfd, bfd_reloc->howto->type, p);
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bfd_put_8 (abfd, sym_num, p + 1);
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p = try_prev_fixup (abfd, &subspace_reloc_size, p,
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2, reloc_queue);
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}
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else if (sym_num < 0x10000000)
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{
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bfd_put_8 (abfd, bfd_reloc->howto->type + 1, p);
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bfd_put_8 (abfd, sym_num >> 16, p + 1);
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bfd_put_16 (abfd, sym_num, p + 2);
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p = try_prev_fixup (abfd, &subspace_reloc_size,
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p, 4, reloc_queue);
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}
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else
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abort ();
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break;
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case R_ENTRY:
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{
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int *descp
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= (int *) (*som_symbol_data ((*bfd_reloc->sym_ptr_ptr)))->unwind;
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bfd_put_8 (abfd, R_ENTRY, p);
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bfd_put_32 (abfd, descp[0], p + 1);
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bfd_put_32 (abfd, descp[1], p + 5);
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p = try_prev_fixup (abfd, &subspace_reloc_size,
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p, 9, reloc_queue);
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break;
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}
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case R_EXIT:
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bfd_put_8 (abfd, R_EXIT, p);
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subspace_reloc_size += 1;
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p += 1;
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break;
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/* Put a "R_RESERVED" relocation in the stream if
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we hit something we do not understand. The linker
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will complain loudly if this ever happens. */
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default:
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bfd_put_8 (abfd, 0xff, p);
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subspace_reloc_size += 1;
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p += 1;
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}
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}
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/* Last BFD relocation for a subspace has been processed.
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Map the rest of the subspace with R_NO_RELOCATION fixups. */
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p = som_reloc_skip (abfd, bfd_section_size (abfd, subsection)
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- reloc_offset,
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p, &subspace_reloc_size, reloc_queue);
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/* Scribble out the relocations. */
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if (bfd_write ((PTR) tmp_space, p - tmp_space, 1, abfd)
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!= p - tmp_space)
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{
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bfd_error = system_call_error;
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return false;
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}
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p = tmp_space;
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total_reloc_size += subspace_reloc_size;
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som_section_data (subsection)->subspace_dict.fixup_request_quantity
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= subspace_reloc_size;
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}
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section = section->next;
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}
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*total_reloc_sizep = total_reloc_size;
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return true;
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}
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/* Finally, scribble out the various headers to the disk. */
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static boolean
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