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335 lines
11 KiB
C
335 lines
11 KiB
C
/* BFD back-end for Intel 960 COFF files.
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Copyright (C) 1990, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
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Written by Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#define I960 1
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#define BADMAG(x) I960BADMAG(x)
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "obstack.h"
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#include "coff/i960.h"
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#include "coff/internal.h"
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#include "libcoff.h" /* to allow easier abstraction-breaking */
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static bfd_reloc_status_type optcall_callback
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type coff_i960_relocate
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
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/* The i960 does not support an MMU, so COFF_PAGE_SIZE can be
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arbitrarily small. */
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#define COFF_PAGE_SIZE 1
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#define COFF_LONG_FILENAMES
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#define CALLS 0x66003800 /* Template for 'calls' instruction */
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#define BAL 0x0b000000 /* Template for 'bal' instruction */
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#define BAL_MASK 0x00ffffff
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static bfd_reloc_status_type
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optcall_callback (abfd, reloc_entry, symbol_in, data,
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input_section, ignore_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol_in;
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PTR data;
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asection *input_section;
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bfd *ignore_bfd;
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char **error_message;
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{
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/* This item has already been relocated correctly, but we may be
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* able to patch in yet better code - done by digging out the
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* correct info on this symbol */
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bfd_reloc_status_type result;
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coff_symbol_type *cs = coffsymbol(symbol_in);
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/* Don't do anything with symbols which aren't tied up yet,
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except move the reloc. */
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if (bfd_is_und_section (cs->symbol.section)) {
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reloc_entry->address += input_section->output_offset;
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return bfd_reloc_ok;
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}
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/* So the target symbol has to be of coff type, and the symbol
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has to have the correct native information within it */
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if ((bfd_asymbol_flavour(&cs->symbol) != bfd_target_coff_flavour)
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|| (cs->native == (combined_entry_type *)NULL))
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{
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/* This is interesting, consider the case where we're outputting coff
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from a mix n match input, linking from coff to a symbol defined in a
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bout file will cause this match to be true. Should I complain? This
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will only work if the bout symbol is non leaf. */
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*error_message =
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(char *) "uncertain calling convention for non-COFF symbol";
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result = bfd_reloc_dangerous;
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}
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else
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{
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switch (cs->native->u.syment.n_sclass)
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{
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case C_LEAFSTAT:
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case C_LEAFEXT:
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/* This is a call to a leaf procedure, replace instruction with a bal
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to the correct location. */
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{
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union internal_auxent *aux = &((cs->native+2)->u.auxent);
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int word = bfd_get_32(abfd, (bfd_byte *)data + reloc_entry->address);
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int olf = (aux->x_bal.x_balntry - cs->native->u.syment.n_value);
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BFD_ASSERT(cs->native->u.syment.n_numaux==2);
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/* We replace the original call instruction with a bal to
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the bal entry point - the offset of which is described in
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the 2nd auxent of the original symbol. We keep the native
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sym and auxents untouched, so the delta between the two
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is the offset of the bal entry point. */
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word = ((word + olf) & BAL_MASK) | BAL;
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bfd_put_32(abfd, word, (bfd_byte *) data + reloc_entry->address);
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}
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result = bfd_reloc_ok;
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break;
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case C_SCALL:
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/* This is a call to a system call, replace with a calls to # */
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BFD_ASSERT(0);
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result = bfd_reloc_ok;
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break;
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default:
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result = bfd_reloc_ok;
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break;
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}
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}
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return result;
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}
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/* i960 COFF is used by VxWorks 5.1. However, VxWorks 5.1 does not
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appear to correctly handle a reloc against a symbol defined in the
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same object file. It appears to simply discard such relocs, rather
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than adding their values into the object file. We handle this here
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by converting all relocs against defined symbols into relocs
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against the section symbol, when generating a relocateable output
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file. */
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static bfd_reloc_status_type
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coff_i960_relocate (abfd, reloc_entry, symbol, data, input_section,
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output_bfd, error_message)
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bfd *abfd;
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arelent *reloc_entry;
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asymbol *symbol;
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PTR data;
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asection *input_section;
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bfd *output_bfd;
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char **error_message;
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{
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asection *osec;
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if (output_bfd == NULL)
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{
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/* Not generating relocateable output file. */
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return bfd_reloc_continue;
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}
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if (bfd_is_und_section (bfd_get_section (symbol)))
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{
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/* Symbol is not defined, so no need to worry about it. */
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return bfd_reloc_continue;
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}
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if (bfd_is_com_section (bfd_get_section (symbol)))
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{
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/* I don't really know what the right action is for a common
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symbol. */
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return bfd_reloc_continue;
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}
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/* Convert the reloc to use the section symbol. FIXME: This method
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is ridiculous. Fortunately, we don't use the used_by_bfd field
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in COFF. */
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osec = bfd_get_section (symbol)->output_section;
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if (osec->used_by_bfd != NULL)
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reloc_entry->sym_ptr_ptr = (asymbol **) osec->used_by_bfd;
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else
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{
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const char *sec_name;
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asymbol **syms, **sym_end;
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sec_name = bfd_get_section_name (output_bfd, osec);
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syms = bfd_get_outsymbols (output_bfd);
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sym_end = syms + bfd_get_symcount (output_bfd);
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for (; syms < sym_end; syms++)
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{
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if (bfd_asymbol_name (*syms) != NULL
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&& (*syms)->value == 0
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&& strcmp (!(*syms)->section->output_section->name, sec_name))
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{
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osec->used_by_bfd = (PTR) syms;
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reloc_entry->sym_ptr_ptr = syms;
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break;
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}
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}
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if (syms >= sym_end)
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abort ();
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}
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/* Let bfd_perform_relocation do its thing, which will include
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stuffing the symbol addend into the object file. */
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return bfd_reloc_continue;
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}
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static reloc_howto_type howto_rellong =
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HOWTO ((unsigned int) R_RELLONG, 0, 2, 32,false, 0,
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complain_overflow_bitfield, coff_i960_relocate,"rellong", true,
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0xffffffff, 0xffffffff, 0);
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static reloc_howto_type howto_iprmed =
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HOWTO (R_IPRMED, 0, 2, 24,true,0, complain_overflow_signed,
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coff_i960_relocate, "iprmed ", true, 0x00ffffff, 0x00ffffff, 0);
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static reloc_howto_type howto_optcall =
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HOWTO (R_OPTCALL, 0,2,24,true,0, complain_overflow_signed,
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optcall_callback, "optcall", true, 0x00ffffff, 0x00ffffff, 0);
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static reloc_howto_type *
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coff_i960_reloc_type_lookup (abfd, code)
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bfd *abfd;
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bfd_reloc_code_real_type code;
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{
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switch (code)
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{
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default:
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return 0;
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case BFD_RELOC_I960_CALLJ:
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return &howto_optcall;
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case BFD_RELOC_32:
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case BFD_RELOC_CTOR:
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return &howto_rellong;
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case BFD_RELOC_24_PCREL:
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return &howto_iprmed;
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}
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}
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/* The real code is in coffcode.h */
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#define RTYPE2HOWTO(cache_ptr, dst) \
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{ \
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reloc_howto_type *howto_ptr; \
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switch ((dst)->r_type) { \
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case 17: howto_ptr = &howto_rellong; break; \
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case 25: howto_ptr = &howto_iprmed; break; \
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case 27: howto_ptr = &howto_optcall; break; \
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default: howto_ptr = 0; break; \
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} \
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(cache_ptr)->howto = howto_ptr; \
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}
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#include "coffcode.h"
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#undef coff_bfd_reloc_type_lookup
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#define coff_bfd_reloc_type_lookup coff_i960_reloc_type_lookup
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const bfd_target icoff_little_vec =
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{
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"coff-Intel-little", /* name */
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bfd_target_coff_flavour,
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false, /* data byte order is little */
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false, /* header byte order is little */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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'_', /* leading underscore */
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'/', /* ar_pad_char */
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15, /* ar_max_namelen */
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3, /* minimum alignment power */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
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{_bfd_dummy_target, coff_object_p, /* bfd_check_format */
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bfd_generic_archive_p, _bfd_dummy_target},
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{bfd_false, coff_mkobject, /* bfd_set_format */
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, coff_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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BFD_JUMP_TABLE_GENERIC (coff),
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BFD_JUMP_TABLE_COPY (coff),
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BFD_JUMP_TABLE_CORE (_bfd_nocore),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
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BFD_JUMP_TABLE_SYMBOLS (coff),
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BFD_JUMP_TABLE_RELOCS (coff),
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BFD_JUMP_TABLE_WRITE (coff),
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BFD_JUMP_TABLE_LINK (coff),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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COFF_SWAP_TABLE,
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};
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const bfd_target icoff_big_vec =
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{
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"coff-Intel-big", /* name */
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bfd_target_coff_flavour,
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false, /* data byte order is little */
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true, /* header byte order is big */
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(HAS_RELOC | EXEC_P | /* object flags */
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HAS_LINENO | HAS_DEBUG |
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HAS_SYMS | HAS_LOCALS | WP_TEXT),
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(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
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'_', /* leading underscore */
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'/', /* ar_pad_char */
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15, /* ar_max_namelen */
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3, /* minimum alignment power */
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bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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bfd_getb64, bfd_getb_signed_64, bfd_putb64,
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bfd_getb32, bfd_getb_signed_32, bfd_putb32,
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bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
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{_bfd_dummy_target, coff_object_p, /* bfd_check_format */
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bfd_generic_archive_p, _bfd_dummy_target},
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{bfd_false, coff_mkobject, /* bfd_set_format */
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_bfd_generic_mkarchive, bfd_false},
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{bfd_false, coff_write_object_contents, /* bfd_write_contents */
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_bfd_write_archive_contents, bfd_false},
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BFD_JUMP_TABLE_GENERIC (coff),
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BFD_JUMP_TABLE_COPY (coff),
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BFD_JUMP_TABLE_CORE (_bfd_nocore),
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BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
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BFD_JUMP_TABLE_SYMBOLS (coff),
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BFD_JUMP_TABLE_RELOCS (coff),
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BFD_JUMP_TABLE_WRITE (coff),
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BFD_JUMP_TABLE_LINK (coff),
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BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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COFF_SWAP_TABLE,
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};
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