diff options
Diffstat (limited to 'bfd/coff-i960.c')
| -rw-r--r-- | bfd/coff-i960.c | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/bfd/coff-i960.c b/bfd/coff-i960.c new file mode 100644 index 00000000000..25455d9ead8 --- /dev/null +++ b/bfd/coff-i960.c @@ -0,0 +1,703 @@ +/* BFD back-end for Intel 960 COFF files. + Copyright (C) 1990, 91, 92, 93, 94, 95, 1997 Free Software Foundation, Inc. + Written by Cygnus Support. + +This file is part of BFD, the Binary File Descriptor library. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#define I960 1 +#define BADMAG(x) I960BADMAG(x) + +#include "bfd.h" +#include "sysdep.h" +#include "libbfd.h" +#include "coff/i960.h" +#include "coff/internal.h" +#include "libcoff.h" /* to allow easier abstraction-breaking */ + +static boolean coff_i960_is_local_label_name PARAMS ((bfd *, const char *)); +static bfd_reloc_status_type optcall_callback + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static bfd_reloc_status_type coff_i960_relocate + PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); +static reloc_howto_type *coff_i960_reloc_type_lookup + PARAMS ((bfd *, bfd_reloc_code_real_type)); +static boolean coff_i960_start_final_link + PARAMS ((bfd *, struct bfd_link_info *)); +static boolean coff_i960_relocate_section + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, + struct internal_reloc *, struct internal_syment *, asection **)); +static boolean coff_i960_adjust_symndx + PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, + struct internal_reloc *, boolean *)); + +#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3) +#define COFF_ALIGN_IN_SECTION_HEADER 1 + +#define GET_SCNHDR_ALIGN bfd_h_get_32 +#define PUT_SCNHDR_ALIGN bfd_h_put_32 + +/* The i960 does not support an MMU, so COFF_PAGE_SIZE can be + arbitrarily small. */ +#define COFF_PAGE_SIZE 1 + +#define COFF_LONG_FILENAMES + +/* This set of local label names is taken from gas. */ + +static boolean +coff_i960_is_local_label_name (abfd, name) + bfd *abfd; + const char *name; +{ + return (name[0] == 'L' + || (name[0] == '.' + && (name[1] == 'C' + || name[1] == 'I' + || name[1] == '.'))); +} + +/* This is just like the usual CALC_ADDEND, but it includes the + section VMA for PC relative relocs. */ +#ifndef CALC_ADDEND +#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \ + { \ + coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \ + if (ptr && bfd_asymbol_bfd (ptr) != abfd) \ + coffsym = (obj_symbols (abfd) \ + + (cache_ptr->sym_ptr_ptr - symbols)); \ + else if (ptr) \ + coffsym = coff_symbol_from (abfd, ptr); \ + if (coffsym != (coff_symbol_type *) NULL \ + && coffsym->native->u.syment.n_scnum == 0) \ + cache_ptr->addend = 0; \ + else if (ptr && bfd_asymbol_bfd (ptr) == abfd \ + && ptr->section != (asection *) NULL) \ + cache_ptr->addend = - (ptr->section->vma + ptr->value); \ + else \ + cache_ptr->addend = 0; \ + if (ptr && (reloc.r_type == 25 || reloc.r_type == 27)) \ + cache_ptr->addend += asect->vma; \ + } +#endif + +#define CALLS 0x66003800 /* Template for 'calls' instruction */ +#define BAL 0x0b000000 /* Template for 'bal' instruction */ +#define BAL_MASK 0x00ffffff + +static bfd_reloc_status_type +optcall_callback (abfd, reloc_entry, symbol_in, data, + input_section, ignore_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol_in; + PTR data; + asection *input_section; + bfd *ignore_bfd; + char **error_message; +{ + /* This item has already been relocated correctly, but we may be + * able to patch in yet better code - done by digging out the + * correct info on this symbol */ + bfd_reloc_status_type result; + coff_symbol_type *cs = coffsymbol(symbol_in); + + /* Don't do anything with symbols which aren't tied up yet, + except move the reloc. */ + if (bfd_is_und_section (cs->symbol.section)) { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + /* So the target symbol has to be of coff type, and the symbol + has to have the correct native information within it */ + if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour) + || (cs->native == (combined_entry_type *)NULL)) + { + /* This is interesting, consider the case where we're outputting coff + from a mix n match input, linking from coff to a symbol defined in a + bout file will cause this match to be true. Should I complain? This + will only work if the bout symbol is non leaf. */ + *error_message = + (char *) _("uncertain calling convention for non-COFF symbol"); + result = bfd_reloc_dangerous; + } + else + { + switch (cs->native->u.syment.n_sclass) + { + case C_LEAFSTAT: + case C_LEAFEXT: + /* This is a call to a leaf procedure, replace instruction with a bal + to the correct location. */ + { + union internal_auxent *aux = &((cs->native+2)->u.auxent); + int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address); + int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value); + BFD_ASSERT(cs->native->u.syment.n_numaux==2); + + /* We replace the original call instruction with a bal to + the bal entry point - the offset of which is described in + the 2nd auxent of the original symbol. We keep the native + sym and auxents untouched, so the delta between the two + is the offset of the bal entry point. */ + word = ((word + olf) & BAL_MASK) | BAL; + bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address); + } + result = bfd_reloc_ok; + break; + case C_SCALL: + /* This is a call to a system call, replace with a calls to # */ + BFD_ASSERT(0); + result = bfd_reloc_ok; + break; + default: + result = bfd_reloc_ok; + break; + } + } + return result; +} + +/* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not + appear to correctly handle a reloc against a symbol defined in the + same object file. It appears to simply discard such relocs, rather + than adding their values into the object file. We handle this here + by converting all relocs against defined symbols into relocs + against the section symbol, when generating a relocateable output + file. + + Note that this function is only called if we are not using the COFF + specific backend linker. It only does something when doing a + relocateable link, which will almost certainly fail when not + generating COFF i960 output, so this function is actually no longer + useful. It was used before this target was converted to use the + COFF specific backend linker. */ + +static bfd_reloc_status_type +coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section, + output_bfd, error_message) + bfd *abfd; + arelent *reloc_entry; + asymbol *symbol; + PTR data; + asection *input_section; + bfd *output_bfd; + char **error_message; +{ + asection *osec; + + if (output_bfd == NULL) + { + /* Not generating relocateable output file. */ + return bfd_reloc_continue; + } + + if (bfd_is_und_section (bfd_get_section (symbol))) + { + /* Symbol is not defined, so no need to worry about it. */ + return bfd_reloc_continue; + } + + if (bfd_is_com_section (bfd_get_section (symbol))) + { + /* I don't really know what the right action is for a common + symbol. */ + return bfd_reloc_continue; + } + + /* Convert the reloc to use the section symbol. FIXME: This method + is ridiculous. */ + osec = bfd_get_section (symbol)->output_section; + if (coff_section_data (output_bfd, osec) != NULL + && coff_section_data (output_bfd, osec)->tdata != NULL) + reloc_entry->sym_ptr_ptr = + (asymbol **) coff_section_data (output_bfd, osec)->tdata; + else + { + const char *sec_name; + asymbol **syms, **sym_end; + + sec_name = bfd_get_section_name (output_bfd, osec); + syms = bfd_get_outsymbols (output_bfd); + sym_end = syms + bfd_get_symcount (output_bfd); + for (; syms < sym_end; syms++) + { + if (bfd_asymbol_name (*syms) != NULL + && (*syms)->value == 0 + && strcmp ((*syms)->section->output_section->name, + sec_name) == 0) + break; + } + + if (syms >= sym_end) + abort (); + + reloc_entry->sym_ptr_ptr = syms; + + if (coff_section_data (output_bfd, osec) == NULL) + { + osec->used_by_bfd = + ((PTR) bfd_zalloc (abfd, + sizeof (struct coff_section_tdata))); + if (osec->used_by_bfd == NULL) + return bfd_reloc_overflow; + } + coff_section_data (output_bfd, osec)->tdata = (PTR) syms; + } + + /* Let bfd_perform_relocation do its thing, which will include + stuffing the symbol addend into the object file. */ + return bfd_reloc_continue; +} + +static reloc_howto_type howto_rellong = + HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0, + complain_overflow_bitfield, coff_i960_relocate,"rellong", true, + 0xffffffff, 0xffffffff, 0); +static reloc_howto_type howto_iprmed = + HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed, + coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0); +static reloc_howto_type howto_optcall = + HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed, + optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0); + +static reloc_howto_type * +coff_i960_reloc_type_lookup (abfd, code) + bfd *abfd; + bfd_reloc_code_real_type code; +{ + switch (code) + { + default: + return 0; + case BFD_RELOC_I960_CALLJ: + return &howto_optcall; + case BFD_RELOC_32: + case BFD_RELOC_CTOR: + return &howto_rellong; + case BFD_RELOC_24_PCREL: + return &howto_iprmed; + } +} + +/* The real code is in coffcode.h */ + +#define RTYPE2HOWTO(cache_ptr, dst) \ +{ \ + reloc_howto_type *howto_ptr; \ + switch ((dst)->r_type) { \ + case 17: howto_ptr = &howto_rellong; break; \ + case 25: howto_ptr = &howto_iprmed; break; \ + case 27: howto_ptr = &howto_optcall; break; \ + default: howto_ptr = 0; break; \ + } \ + (cache_ptr)->howto = howto_ptr; \ + } + +/* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not + appear to correctly handle a reloc against a symbol defined in the + same object file. It appears to simply discard such relocs, rather + than adding their values into the object file. We handle this by + converting all relocs against global symbols into relocs against + internal symbols at the start of the section. This routine is + called at the start of the linking process, and it creates the + necessary symbols. */ + +static boolean +coff_i960_start_final_link (abfd, info) + bfd *abfd; + struct bfd_link_info *info; +{ + bfd_size_type symesz = bfd_coff_symesz (abfd); + asection *o; + bfd_byte *esym; + + if (! info->relocateable) + return true; + + esym = (bfd_byte *) bfd_malloc (symesz); + if (esym == NULL) + return false; + + if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0) + return false; + + for (o = abfd->sections; o != NULL; o = o->next) + { + struct internal_syment isym; + + strncpy (isym._n._n_name, o->name, SYMNMLEN); + isym.n_value = 0; + isym.n_scnum = o->target_index; + isym.n_type = T_NULL; + isym.n_sclass = C_STAT; + isym.n_numaux = 0; + + bfd_coff_swap_sym_out (abfd, (PTR) &isym, (PTR) esym); + + if (bfd_write (esym, symesz, 1, abfd) != symesz) + { + free (esym); + return false; + } + + obj_raw_syment_count (abfd) += 1; + } + + free (esym); + + return true; +} + +/* The reloc processing routine for the optimized COFF linker. */ + +static boolean +coff_i960_relocate_section (output_bfd, info, input_bfd, input_section, + contents, relocs, syms, sections) + bfd *output_bfd; + struct bfd_link_info *info; + bfd *input_bfd; + asection *input_section; + bfd_byte *contents; + struct internal_reloc *relocs; + struct internal_syment *syms; + asection **sections; +{ + struct internal_reloc *rel; + struct internal_reloc *relend; + + rel = relocs; + relend = rel + input_section->reloc_count; + for (; rel < relend; rel++) + { + long symndx; + struct coff_link_hash_entry *h; + struct internal_syment *sym; + bfd_vma addend; + bfd_vma val; + reloc_howto_type *howto; + bfd_reloc_status_type rstat = bfd_reloc_ok; + boolean done; + + symndx = rel->r_symndx; + + if (symndx == -1) + { + h = NULL; + sym = NULL; + } + else + { + h = obj_coff_sym_hashes (input_bfd)[symndx]; + sym = syms + symndx; + } + + if (sym != NULL && sym->n_scnum != 0) + addend = - sym->n_value; + else + addend = 0; + + switch (rel->r_type) + { + case 17: howto = &howto_rellong; break; + case 25: howto = &howto_iprmed; break; + case 27: howto = &howto_optcall; break; + default: + bfd_set_error (bfd_error_bad_value); + return false; + } + + val = 0; + + if (h == NULL) + { + asection *sec; + + if (symndx == -1) + { + sec = bfd_abs_section_ptr; + val = 0; + } + else + { + sec = sections[symndx]; + val = (sec->output_section->vma + + sec->output_offset + + sym->n_value + - sec->vma); + } + } + else + { + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + asection *sec; + + sec = h->root.u.def.section; + val = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (! info->relocateable) + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, input_section, + rel->r_vaddr - input_section->vma))) + return false; + } + } + + done = false; + + if (howto->type == R_OPTCALL && ! info->relocateable && symndx != -1) + { + int class; + + if (h != NULL) + class = h->class; + else + class = sym->n_sclass; + + switch (class) + { + case C_NULL: + /* This symbol is apparently not from a COFF input file. + We warn, and then assume that it is not a leaf + function. */ + if (! ((*info->callbacks->reloc_dangerous) + (info, + _("uncertain calling convention for non-COFF symbol"), + input_bfd, input_section, + rel->r_vaddr - input_section->vma))) + return false; + break; + case C_LEAFSTAT: + case C_LEAFEXT: + /* This is a call to a leaf procedure; use the bal + instruction. */ + { + long olf; + unsigned long word; + + if (h != NULL) + { + BFD_ASSERT (h->numaux == 2); + olf = h->aux[1].x_bal.x_balntry; + } + else + { + bfd_byte *esyms; + union internal_auxent aux; + + BFD_ASSERT (sym->n_numaux == 2); + esyms = (bfd_byte *) obj_coff_external_syms (input_bfd); + esyms += (symndx + 2) * bfd_coff_symesz (input_bfd); + bfd_coff_swap_aux_in (input_bfd, (PTR) esyms, sym->n_type, + sym->n_sclass, 1, sym->n_numaux, + (PTR) &aux); + olf = aux.x_bal.x_balntry; + } + + word = bfd_get_32 (input_bfd, + (contents + + (rel->r_vaddr - input_section->vma))); + word = ((word + olf - val) & BAL_MASK) | BAL; + bfd_put_32 (input_bfd, + word, + (contents + + (rel->r_vaddr - input_section->vma))); + done = true; + } + break; + case C_SCALL: + BFD_ASSERT (0); + break; + } + } + + if (! done) + { + if (howto->pc_relative) + addend += input_section->vma; + rstat = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, + rel->r_vaddr - input_section->vma, + val, addend); + } + + switch (rstat) + { + default: + abort (); + case bfd_reloc_ok: + break; + case bfd_reloc_overflow: + { + const char *name; + char buf[SYMNMLEN + 1]; + + if (symndx == -1) + name = "*ABS*"; + else if (h != NULL) + name = h->root.root.string; + else + { + name = _bfd_coff_internal_syment_name (input_bfd, sym, buf); + if (name == NULL) + return false; + } + + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, input_bfd, + input_section, rel->r_vaddr - input_section->vma))) + return false; + } + } + } + + return true; +} + +/* Adjust the symbol index of any reloc against a global symbol to + instead be a reloc against the internal symbol we created specially + for the section. */ + +/*ARGSUSED*/ +static boolean +coff_i960_adjust_symndx (obfd, info, ibfd, sec, irel, adjustedp) + bfd *obfd; + struct bfd_link_info *info; + bfd *ibfd; + asection *sec; + struct internal_reloc *irel; + boolean *adjustedp; +{ + struct coff_link_hash_entry *h; + + *adjustedp = false; + + h = obj_coff_sym_hashes (ibfd)[irel->r_symndx]; + if (h == NULL + || (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak)) + return true; + + irel->r_symndx = h->root.u.def.section->output_section->target_index - 1; + *adjustedp = true; + + return true; +} + +#define coff_bfd_is_local_label_name coff_i960_is_local_label_name + +#define coff_start_final_link coff_i960_start_final_link + +#define coff_relocate_section coff_i960_relocate_section + +#define coff_adjust_symndx coff_i960_adjust_symndx + +#define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup + +#include "coffcode.h" + +const bfd_target icoff_little_vec = +{ + "coff-Intel-little", /* name */ + bfd_target_coff_flavour, + BFD_ENDIAN_LITTLE, /* data byte order is little */ + BFD_ENDIAN_LITTLE, /* header byte order is little */ + + (HAS_RELOC | EXEC_P | /* object flags */ + HAS_LINENO | HAS_DEBUG | + HAS_SYMS | HAS_LOCALS | WP_TEXT), + + (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ + '_', /* leading underscore */ + '/', /* ar_pad_char */ + 15, /* ar_max_namelen */ + + bfd_getl64, bfd_getl_signed_64, bfd_putl64, + bfd_getl32, bfd_getl_signed_32, bfd_putl32, + bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ + bfd_getl64, bfd_getl_signed_64, bfd_putl64, + bfd_getl32, bfd_getl_signed_32, bfd_putl32, + bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */ + + {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ + bfd_generic_archive_p, _bfd_dummy_target}, + {bfd_false, coff_mkobject, /* bfd_set_format */ + _bfd_generic_mkarchive, bfd_false}, + {bfd_false, coff_write_object_contents, /* bfd_write_contents */ + _bfd_write_archive_contents, bfd_false}, + + BFD_JUMP_TABLE_GENERIC (coff), + BFD_JUMP_TABLE_COPY (coff), + BFD_JUMP_TABLE_CORE (_bfd_nocore), + BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), + BFD_JUMP_TABLE_SYMBOLS (coff), + BFD_JUMP_TABLE_RELOCS (coff), + BFD_JUMP_TABLE_WRITE (coff), + BFD_JUMP_TABLE_LINK (coff), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + COFF_SWAP_TABLE, +}; + + +const bfd_target icoff_big_vec = +{ + "coff-Intel-big", /* name */ + bfd_target_coff_flavour, + BFD_ENDIAN_LITTLE, /* data byte order is little */ + BFD_ENDIAN_BIG, /* header byte order is big */ + + (HAS_RELOC | EXEC_P | /* object flags */ + HAS_LINENO | HAS_DEBUG | + HAS_SYMS | HAS_LOCALS | WP_TEXT), + + (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ + '_', /* leading underscore */ + '/', /* ar_pad_char */ + 15, /* ar_max_namelen */ + +bfd_getl64, bfd_getl_signed_64, bfd_putl64, + bfd_getl32, bfd_getl_signed_32, bfd_putl32, + bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */ +bfd_getb64, bfd_getb_signed_64, bfd_putb64, + bfd_getb32, bfd_getb_signed_32, bfd_putb32, + bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */ + + {_bfd_dummy_target, coff_object_p, /* bfd_check_format */ + bfd_generic_archive_p, _bfd_dummy_target}, + {bfd_false, coff_mkobject, /* bfd_set_format */ + _bfd_generic_mkarchive, bfd_false}, + {bfd_false, coff_write_object_contents, /* bfd_write_contents */ + _bfd_write_archive_contents, bfd_false}, + + BFD_JUMP_TABLE_GENERIC (coff), + BFD_JUMP_TABLE_COPY (coff), + BFD_JUMP_TABLE_CORE (_bfd_nocore), + BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff), + BFD_JUMP_TABLE_SYMBOLS (coff), + BFD_JUMP_TABLE_RELOCS (coff), + BFD_JUMP_TABLE_WRITE (coff), + BFD_JUMP_TABLE_LINK (coff), + BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), + + COFF_SWAP_TABLE, +}; |