diff options
Diffstat (limited to 'binutils-2.25/bfd/coff-m68k.c')
| -rw-r--r-- | binutils-2.25/bfd/coff-m68k.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/coff-m68k.c b/binutils-2.25/bfd/coff-m68k.c new file mode 100644 index 00000000..5287beb8 --- /dev/null +++ b/binutils-2.25/bfd/coff-m68k.c @@ -0,0 +1,544 @@ +/* BFD back-end for Motorola 68000 COFF binaries. + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999, + 2000, 2001, 2002, 2003, 2005, 2007, 2008, 2012 + 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 3 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.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 m68kcoff_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 + +#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) +{ + 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 + +#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 */ + +#ifndef BADMAG +#define BADMAG(x) M68KBADMAG(x) +#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; + } +} + +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*/ +} + +STAT_REL reloc_howto_type * +m68k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + 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]; + + return NULL; +} + +#endif /* not ONLY_DECLARE_RELOCS */ + +#define RTYPE2HOWTO(internal, relocentry) \ + m68k_rtype2howto(internal, (relocentry)->r_type) + +#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) */ + +#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 (abfd, 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 */ + +#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 m68kcoff_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 |