-/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
+/* BFD back-end for Motorola 68000 COFF binaries.
+ Copyright (C) 1990-2015 Free Software Foundation, Inc.
+ Written by Cygnus Support.
-This file is part of BFD, the Binary File Diddler.
+ This file is part of BFD, the Binary File Descriptor library.
-BFD 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 1, or (at your option)
-any later version.
+ 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 3 of the License, or
+ (at your option) any later version.
-BFD 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.
+ 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 BFD; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+ 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., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-
-/* $Id$ */
-
-#define M68 1
-#include <ansidecl.h>
-#include <sysdep.h>
+#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
-#include "obstack.h"
-#include "m68kcoff.h"
+#include "coff/m68k.h"
+#include "coff/internal.h"
#include "libcoff.h"
+/* This source file is compiled multiple times for various m68k COFF
+ variants. The following macros control its behaviour:
+
+ TARGET_SYM
+ The C name of the BFD target vector. The default is m68k_coff_vec.
+ TARGET_NAME
+ The user visible target name. The default is "coff-m68k".
+ NAMES_HAVE_UNDERSCORE
+ Whether symbol names have an underscore.
+ ONLY_DECLARE_RELOCS
+ Only declare the relocation howto array. Don't actually compile
+ it. The actual array will be picked up in another version of the
+ file.
+ STATIC_RELOCS
+ Make the relocation howto array, and associated functions, static.
+ COFF_COMMON_ADDEND
+ If this is defined, then, for a relocation against a common
+ symbol, the object file holds the value (the size) of the common
+ symbol. If this is not defined, then, for a relocation against a
+ common symbol, the object file holds zero. */
+
+#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
+
+#ifndef COFF_PAGE_SIZE
+/* The page size is a guess based on ELF. */
+#define COFF_PAGE_SIZE 0x2000
+#endif
-static reloc_howto_type howto_table[] =
+#ifndef COFF_COMMON_ADDEND
+#define RELOC_SPECIAL_FN 0
+#else
+static bfd_reloc_status_type m68kcoff_common_addend_special_fn
+ (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);
+
+#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
+#endif
+
+static bfd_boolean m68k_coff_is_local_label_name (bfd *, const char *);
+
+/* On the delta, a symbol starting with L% is local. We won't see
+ such a symbol on other platforms, so it should be safe to always
+ consider it local here. */
+
+static bfd_boolean
+m68k_coff_is_local_label_name (bfd *abfd, const char *name)
{
- HOWTO(R_RELBYTE, 0, 0, 8, false, 0, true, true,0,"8", true, 0x000000ff,0x000000ff, false),
- HOWTO(R_RELWORD, 0, 1, 16, false, 0, true, true,0,"16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO(R_RELLONG, 0, 2, 32, false, 0, true, true,0,"32", true, 0xffffffff,0xffffffff, false),
- HOWTO(R_PCRBYTE, 0, 0, 8, true, 0, false, true,0,"DISP8", true, 0x000000ff,0x000000ff, false),
- HOWTO(R_PCRWORD, 0, 1, 16, true, 0, false, true,0,"DISP16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO(R_PCRLONG, 0, 2, 32, true, 0, false, true,0,"DISP32", true, 0xffffffff,0xffffffff, false),
-};
+ if (name[0] == 'L' && name[1] == '%')
+ return TRUE;
+
+ return _bfd_coff_is_local_label_name (abfd, name);
+}
+#ifndef STATIC_RELOCS
+/* Clean up namespace. */
+#define m68kcoff_howto_table _bfd_m68kcoff_howto_table
+#define m68k_rtype2howto _bfd_m68kcoff_rtype2howto
+#define m68k_howto2rtype _bfd_m68kcoff_howto2rtype
+#define m68k_reloc_type_lookup _bfd_m68kcoff_reloc_type_lookup
+#define m68k_reloc_name_lookup _bfd_m68kcoff_reloc_name_lookup
+#endif
-/* Turn a howto into a reloc nunmber */
+#ifdef ONLY_DECLARE_RELOCS
+extern reloc_howto_type m68kcoff_howto_table[];
+#else
+#ifdef STATIC_RELOCS
+static
+#endif
+reloc_howto_type m68kcoff_howto_table[] =
+ {
+ HOWTO (R_RELBYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8", TRUE, 0x000000ff,0x000000ff, FALSE),
+ HOWTO (R_RELWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
+ HOWTO (R_RELLONG, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32", TRUE, 0xffffffff,0xffffffff, FALSE),
+ HOWTO (R_PCRBYTE, 0, 0, 8, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8", TRUE, 0x000000ff,0x000000ff, FALSE),
+ HOWTO (R_PCRWORD, 0, 1, 16, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
+ HOWTO (R_PCRLONG, 0, 2, 32, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32", TRUE, 0xffffffff,0xffffffff, FALSE),
+ HOWTO (R_RELLONG_NEG, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32", TRUE, 0xffffffff,0xffffffff, FALSE),
+ };
+#endif /* not ONLY_DECLARE_RELOCS */
-#define SELECT_RELOC(x,howto) { x = howto_table[howto->size +(int)howto->pc_relative*3].type; }
+#ifndef BADMAG
#define BADMAG(x) M68KBADMAG(x)
-#include "coff-code.h"
+#endif
+#define M68 1 /* Customize coffcode.h */
+
+/* Turn a howto into a reloc number */
+
+#ifdef ONLY_DECLARE_RELOCS
+extern void m68k_rtype2howto (arelent *internal, int relocentry);
+extern int m68k_howto2rtype (reloc_howto_type *);
+extern reloc_howto_type * m68k_reloc_type_lookup
+ (bfd *, bfd_reloc_code_real_type);
+extern reloc_howto_type * m68k_reloc_name_lookup (bfd *, const char *);
+#else
+
+#ifdef STATIC_RELOCS
+#define STAT_REL static
+#else
+#define STAT_REL
+#endif
+
+STAT_REL void m68k_rtype2howto (arelent *, int);
+STAT_REL int m68k_howto2rtype (reloc_howto_type *);
+STAT_REL reloc_howto_type * m68k_reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
+STAT_REL reloc_howto_type * m68k_reloc_name_lookup (bfd *, const char *);
+STAT_REL void
+m68k_rtype2howto (arelent *internal, int relocentry)
+{
+ switch (relocentry)
+ {
+ case R_RELBYTE: internal->howto = m68kcoff_howto_table + 0; break;
+ case R_RELWORD: internal->howto = m68kcoff_howto_table + 1; break;
+ case R_RELLONG: internal->howto = m68kcoff_howto_table + 2; break;
+ case R_PCRBYTE: internal->howto = m68kcoff_howto_table + 3; break;
+ case R_PCRWORD: internal->howto = m68kcoff_howto_table + 4; break;
+ case R_PCRLONG: internal->howto = m68kcoff_howto_table + 5; break;
+ case R_RELLONG_NEG: internal->howto = m68kcoff_howto_table + 6; break;
+ default: internal->howto = NULL; break;
+ }
+}
-#define coff_write_armap bsd_write_armap
+STAT_REL int
+m68k_howto2rtype (reloc_howto_type * internal)
+{
+ if (internal->pc_relative)
+ {
+ switch (internal->bitsize)
+ {
+ case 32: return R_PCRLONG;
+ case 16: return R_PCRWORD;
+ case 8: return R_PCRBYTE;
+ }
+ }
+ else
+ {
+ switch (internal->bitsize)
+ {
+ case 32: return R_RELLONG;
+ case 16: return R_RELWORD;
+ case 8: return R_RELBYTE;
+ }
+ }
+ return R_RELLONG;
+}
+STAT_REL reloc_howto_type *
+m68k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ bfd_reloc_code_real_type code)
+{
+ switch (code)
+ {
+ default: return NULL;
+ case BFD_RELOC_8: return m68kcoff_howto_table + 0;
+ case BFD_RELOC_16: return m68kcoff_howto_table + 1;
+ case BFD_RELOC_CTOR:
+ case BFD_RELOC_32: return m68kcoff_howto_table + 2;
+ case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
+ case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
+ case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
+ /* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
+ }
+ /*NOTREACHED*/
+}
-bfd_target m68kcoff_vec =
+STAT_REL reloc_howto_type *
+m68k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ const char *r_name)
{
- "m68kcoff", /* name */
- bfd_target_coff_flavour_enum,
- true, /* data byte order is big */
- true, /* header byte order is big */
+ unsigned int i;
- (HAS_RELOC | EXEC_P | /* object flags */
- HAS_LINENO | HAS_DEBUG |
- HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
+ for (i = 0;
+ i < sizeof (m68kcoff_howto_table) / sizeof (m68kcoff_howto_table[0]);
+ i++)
+ if (m68kcoff_howto_table[i].name != NULL
+ && strcasecmp (m68kcoff_howto_table[i].name, r_name) == 0)
+ return &m68kcoff_howto_table[i];
- (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
- '/', /* ar_pad_char */
- 15, /* ar_max_namelen */
+ return NULL;
+}
-_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* data */
-_do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
+#endif /* not ONLY_DECLARE_RELOCS */
- {_bfd_dummy_target, coff_object_p, /* bfd_check_format */
- bfd_generic_archive_p, _bfd_dummy_target},
- {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
- bfd_false},
- {bfd_false, coff_write_object_contents, /* bfd_write_contents */
- _bfd_write_archive_contents, bfd_false},
+#define RTYPE2HOWTO(internal, relocentry) \
+ m68k_rtype2howto(internal, (relocentry)->r_type)
- JUMP_TABLE(coff)
+#define SELECT_RELOC(external, internal) \
+ external.r_type = m68k_howto2rtype (internal)
- };
+#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
+#define coff_bfd_reloc_name_lookup m68k_reloc_name_lookup
+
+#ifndef COFF_COMMON_ADDEND
+#ifndef coff_rtype_to_howto
+
+#define coff_rtype_to_howto m68kcoff_rtype_to_howto
+
+static reloc_howto_type *
+m68kcoff_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
+ asection *sec,
+ struct internal_reloc *rel,
+ struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
+ struct internal_syment *sym ATTRIBUTE_UNUSED,
+ bfd_vma *addendp)
+{
+ arelent relent;
+ reloc_howto_type *howto;
+
+ relent.howto = NULL;
+ RTYPE2HOWTO (&relent, rel);
+
+ howto = relent.howto;
+
+ if (howto != NULL && howto->pc_relative)
+ *addendp += sec->vma;
+
+ return howto;
+}
+
+#endif /* ! defined (coff_rtype_to_howto) */
+#endif /* ! defined (COFF_COMMON_ADDEND) */
+\f
+#ifdef COFF_COMMON_ADDEND
+
+/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
+ value stored in the .text section for a reference to a common
+ symbol is the value itself plus any desired offset. (taken from
+ work done by Ian Taylor, Cygnus Support, for I386 COFF). */
+
+/* If we are producing relocatable output, we need to do some
+ adjustments to the object file that are not done by the
+ bfd_perform_relocation function. This function is called by every
+ reloc type to make any required adjustments. */
+
+static bfd_reloc_status_type
+m68kcoff_common_addend_special_fn (bfd *abfd,
+ arelent *reloc_entry,
+ asymbol *symbol,
+ void * data,
+ asection *input_section ATTRIBUTE_UNUSED,
+ bfd *output_bfd,
+ char **error_message ATTRIBUTE_UNUSED)
+{
+ symvalue diff;
+
+ if (output_bfd == (bfd *) NULL)
+ return bfd_reloc_continue;
+
+ if (bfd_is_com_section (symbol->section))
+ {
+ /* We are relocating a common symbol. The current value in the
+ object file is ORIG + OFFSET, where ORIG is the value of the
+ common symbol as seen by the object file when it was compiled
+ (this may be zero if the symbol was undefined) and OFFSET is
+ the offset into the common symbol (normally zero, but may be
+ non-zero when referring to a field in a common structure).
+ ORIG is the negative of reloc_entry->addend, which is set by
+ the CALC_ADDEND macro below. We want to replace the value in
+ the object file with NEW + OFFSET, where NEW is the value of
+ the common symbol which we are going to put in the final
+ object file. NEW is symbol->value. */
+ diff = symbol->value + reloc_entry->addend;
+ }
+ else
+ {
+ /* For some reason bfd_perform_relocation always effectively
+ ignores the addend for a COFF target when producing
+ relocatable output. This seems to be always wrong for 386
+ COFF, so we handle the addend here instead. */
+ diff = reloc_entry->addend;
+ }
+
+#define DOIT(x) \
+ x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
+
+ if (diff != 0)
+ {
+ reloc_howto_type *howto = reloc_entry->howto;
+ unsigned char *addr = (unsigned char *) data + reloc_entry->address;
+
+ switch (howto->size)
+ {
+ case 0:
+ {
+ char x = bfd_get_8 (abfd, addr);
+ DOIT (x);
+ bfd_put_8 (abfd, x, addr);
+ }
+ break;
+
+ case 1:
+ {
+ short x = bfd_get_16 (abfd, addr);
+ DOIT (x);
+ bfd_put_16 (abfd, (bfd_vma) x, addr);
+ }
+ break;
+
+ case 2:
+ {
+ long x = bfd_get_32 (abfd, addr);
+ DOIT (x);
+ bfd_put_32 (abfd, (bfd_vma) x, addr);
+ }
+ break;
+
+ default:
+ abort ();
+ }
+ }
+
+ /* Now let bfd_perform_relocation finish everything up. */
+ return bfd_reloc_continue;
+}
+
+/* Compute the addend of a reloc. If the reloc is to a common symbol,
+ the object file contains the value of the common symbol. By the
+ time this is called, the linker may be using a different symbol
+ from a different object file with a different value. Therefore, we
+ hack wildly to locate the original symbol from this file so that we
+ can make the correct adjustment. This macro sets coffsym to the
+ symbol from the original file, and uses it to set the addend value
+ correctly. If this is not a common symbol, the usual addend
+ calculation is done, except that an additional tweak is needed for
+ PC relative relocs.
+ FIXME: This macro refers to symbols and asect; these are from the
+ calling function, not the macro arguments. */
+
+#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 (ptr); \
+ if (coffsym != (coff_symbol_type *) NULL \
+ && coffsym->native->u.syment.n_scnum == 0) \
+ cache_ptr->addend = - coffsym->native->u.syment.n_value; \
+ 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 == R_PCRBYTE \
+ || reloc.r_type == R_PCRWORD \
+ || reloc.r_type == R_PCRLONG)) \
+ cache_ptr->addend += asect->vma; \
+ }
+
+#ifndef coff_rtype_to_howto
+
+/* coff-m68k.c uses the special COFF backend linker. We need to
+ adjust common symbols. */
+
+static reloc_howto_type *
+m68kcoff_common_addend_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
+ asection *sec,
+ struct internal_reloc *rel,
+ struct coff_link_hash_entry *h,
+ struct internal_syment *sym,
+ bfd_vma *addendp)
+{
+ arelent relent;
+ reloc_howto_type *howto;
+
+ relent.howto = NULL;
+ RTYPE2HOWTO (&relent, rel);
+
+ howto = relent.howto;
+
+ if (howto->pc_relative)
+ *addendp += sec->vma;
+
+ if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
+ {
+ /* This is a common symbol. The section contents include the
+ size (sym->n_value) as an addend. The relocate_section
+ function will be adding in the final value of the symbol. We
+ need to subtract out the current size in order to get the
+ correct result. */
+ BFD_ASSERT (h != NULL);
+ *addendp -= sym->n_value;
+ }
+
+ /* If the output symbol is common (in which case this must be a
+ relocatable link), we need to add in the final size of the
+ common symbol. */
+ if (h != NULL && h->root.type == bfd_link_hash_common)
+ *addendp += h->root.u.c.size;
+
+ return howto;
+}
+
+#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
+
+#endif /* ! defined (coff_rtype_to_howto) */
+
+#endif /* COFF_COMMON_ADDEND */
+
+#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
+/* Given a .data section and a .emreloc in-memory section, store
+ relocation information into the .emreloc section which can be
+ used at runtime to relocate the section. This is called by the
+ linker when the --embedded-relocs switch is used. This is called
+ after the add_symbols entry point has been called for all the
+ objects, and before the final_link entry point is called. */
+
+bfd_boolean
+bfd_m68k_coff_create_embedded_relocs (bfd *abfd,
+ struct bfd_link_info *info,
+ asection *datasec,
+ asection *relsec,
+ char **errmsg)
+{
+ char *extsyms;
+ bfd_size_type symesz;
+ struct internal_reloc *irel, *irelend;
+ bfd_byte *p;
+ bfd_size_type amt;
+
+ BFD_ASSERT (! info->relocatable);
+
+ *errmsg = NULL;
+
+ if (datasec->reloc_count == 0)
+ return TRUE;
+
+ extsyms = obj_coff_external_syms (abfd);
+ symesz = bfd_coff_symesz (abfd);
+
+ irel = _bfd_coff_read_internal_relocs (abfd, datasec, TRUE, NULL, FALSE,
+ NULL);
+ irelend = irel + datasec->reloc_count;
+
+ amt = (bfd_size_type) datasec->reloc_count * 12;
+ relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
+ if (relsec->contents == NULL)
+ return FALSE;
+
+ p = relsec->contents;
+
+ for (; irel < irelend; irel++, p += 12)
+ {
+ asection *targetsec;
+
+ /* We are going to write a four byte longword into the runtime
+ reloc section. The longword will be the address in the data
+ section which must be relocated. It is followed by the name
+ of the target section NUL-padded or truncated to 8
+ characters. */
+
+ /* We can only relocate absolute longword relocs at run time. */
+ if (irel->r_type != R_RELLONG)
+ {
+ *errmsg = _("unsupported reloc type");
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
+
+ if (irel->r_symndx == -1)
+ targetsec = bfd_abs_section_ptr;
+ else
+ {
+ struct coff_link_hash_entry *h;
+
+ h = obj_coff_sym_hashes (abfd)[irel->r_symndx];
+ if (h == NULL)
+ {
+ struct internal_syment isym;
+
+ bfd_coff_swap_sym_in (abfd, extsyms + symesz * irel->r_symndx,
+ &isym);
+ targetsec = coff_section_from_bfd_index (abfd, isym.n_scnum);
+ }
+ else if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ targetsec = h->root.u.def.section;
+ else
+ targetsec = NULL;
+ }
+
+ bfd_put_32 (abfd,
+ (irel->r_vaddr - datasec->vma + datasec->output_offset), p);
+ memset (p + 4, 0, 8);
+ if (targetsec != NULL)
+ strncpy ((char *) p + 4, targetsec->output_section->name, 8);
+ }
+
+ return TRUE;
+}
+#endif /* neither ONLY_DECLARE_RELOCS not STATIC_RELOCS */
+\f
+#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name
+
+#define coff_relocate_section _bfd_coff_generic_relocate_section
+
+#ifndef bfd_pe_print_pdata
+#define bfd_pe_print_pdata NULL
+#endif
+
+#include "coffcode.h"
+#ifndef TARGET_SYM
+#define TARGET_SYM m68k_coff_vec
+#endif
+#ifndef TARGET_NAME
+#define TARGET_NAME "coff-m68k"
+#endif
+#ifdef NAMES_HAVE_UNDERSCORE
+CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL, COFF_SWAP_TABLE)
+#else
+CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
+#endif
projects / thirdparty / binutils-gdb.git / blobdiff