diff options
Diffstat (limited to 'binutils-2.25/bfd/coff-mcore.c')
| -rw-r--r-- | binutils-2.25/bfd/coff-mcore.c | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/coff-mcore.c b/binutils-2.25/bfd/coff-mcore.c new file mode 100644 index 00000000..9431e465 --- /dev/null +++ b/binutils-2.25/bfd/coff-mcore.c @@ -0,0 +1,561 @@ +/* BFD back-end for Motorola MCore COFF/PE + Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2010, 2011, 2012 + Free Software Foundation, Inc. + + 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, 51 Franklin Street - Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "coff/mcore.h" +#include "coff/internal.h" +#include "coff/pe.h" +#include "libcoff.h" + +#ifdef BADMAG +#undef BADMAG +#endif +#define BADMAG(x) MCOREBADMAG(x) + +#ifndef NUM_ELEM +#define NUM_ELEM(A) (sizeof (A) / sizeof (A)[0]) +#endif + +/* This file is compiled more than once, but we only compile the + final_link routine once. */ +extern bfd_boolean mcore_bfd_coff_final_link + (bfd *, struct bfd_link_info *); +static bfd_reloc_status_type mcore_coff_unsupported_reloc + (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); + + +/* The NT loader points the toc register to &toc + 32768, in order to + use the complete range of a 16-bit displacement. We have to adjust + for this when we fix up loads displaced off the toc reg. */ +#define TOC_LOAD_ADJUSTMENT (-32768) +#define TOC_SECTION_NAME ".private.toc" + +/* The main body of code is in coffcode.h. */ +#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 2 + +/* In case we're on a 32-bit machine, construct a 64-bit "-1" value + from smaller values. Start with zero, widen, *then* decrement. */ +#define MINUS_ONE (((bfd_vma)0) - 1) + +static reloc_howto_type mcore_coff_howto_table[] = +{ + /* Unused: */ + HOWTO (IMAGE_REL_MCORE_ABSOLUTE,/* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 0, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont, /* dont complain_on_overflow */ + NULL, /* special_function */ + "ABSOLUTE", /* name */ + FALSE, /* partial_inplace */ + 0x00, /* src_mask */ + 0x00, /* dst_mask */ + FALSE), /* pcrel_offset */ + + HOWTO (IMAGE_REL_MCORE_ADDR32,/* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + NULL, /* special_function */ + "ADDR32", /* name */ + TRUE, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions. + Should not appear in object files. */ + HOWTO (IMAGE_REL_MCORE_PCREL_IMM8BY4, /* type */ + 2, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + mcore_coff_unsupported_reloc, /* special_function */ + "IMM8BY4", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit + Span 2k instructions == 4k bytes. + Only useful pieces at the relocated address are the opcode (5 bits) */ + HOWTO (IMAGE_REL_MCORE_PCREL_IMM11BY2,/* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 11, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + NULL, /* special_function */ + "IMM11BY2", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0x7ff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported. */ + HOWTO (IMAGE_REL_MCORE_PCREL_IMM4BY2, /* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 4, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + mcore_coff_unsupported_reloc, /* special_function */ + "IMM4BY2", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* 32-bit pc-relative. Eventually this will help support PIC code. */ + HOWTO (IMAGE_REL_MCORE_PCREL_32,/* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + NULL, /* special_function */ + "PCREL_32", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* Like PCREL_IMM11BY2, this relocation indicates that there is a + 'jsri' at the specified address. There is a separate relocation + entry for the literal pool entry that it references, but we + might be able to change the jsri to a bsr if the target turns out + to be close enough [even though we won't reclaim the literal pool + entry, we'll get some runtime efficiency back]. Note that this + is a relocation that we are allowed to safely ignore. */ + HOWTO (IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2,/* type */ + 1, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 11, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + NULL, /* special_function */ + "JSR_IMM11BY2", /* name */ + FALSE, /* partial_inplace */ + 0x0, /* src_mask */ + 0x7ff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + HOWTO (IMAGE_REL_MCORE_RVA, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_signed, /* complain_on_overflow */ + NULL, /* special_function */ + "MCORE_RVA", /* name */ + TRUE, /* partial_inplace */ + 0xffffffff, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE) /* pcrel_offset */ +}; + +/* Extend the coff_link_hash_table structure with a few M*Core specific fields. + This allows us to store global data here without actually creating any + global variables, which is a no-no in the BFD world. */ +typedef struct coff_mcore_link_hash_table +{ + /* The original coff_link_hash_table structure. MUST be first field. */ + struct coff_link_hash_table root; + + bfd * bfd_of_toc_owner; + long int global_toc_size; + long int import_table_size; + long int first_thunk_address; + long int thunk_size; +} +mcore_hash_table; + +/* Get the MCore coff linker hash table from a link_info structure. */ +#define coff_mcore_hash_table(info) \ + ((mcore_hash_table *) ((info)->hash)) + + +/* Add an entry to the base file. */ + +static bfd_boolean +mcore_emit_base_file_entry (struct bfd_link_info *info, + bfd *output_bfd, + asection *input_section, + bfd_vma reloc_offset) +{ + bfd_vma addr = reloc_offset + - input_section->vma + + input_section->output_offset + + input_section->output_section->vma; + + if (coff_data (output_bfd)->pe) + addr -= pe_data (output_bfd)->pe_opthdr.ImageBase; + + if (fwrite (&addr, sizeof (addr), 1, (FILE *) info->base_file) == 1) + return TRUE; + + bfd_set_error (bfd_error_system_call); + return FALSE; +} + +static bfd_reloc_status_type +mcore_coff_unsupported_reloc (bfd * abfd, + arelent * reloc_entry, + asymbol * symbol ATTRIBUTE_UNUSED, + void * data ATTRIBUTE_UNUSED, + asection * input_section ATTRIBUTE_UNUSED, + bfd * output_bfd ATTRIBUTE_UNUSED, + char ** error_message ATTRIBUTE_UNUSED) +{ + BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0); + + _bfd_error_handler (_("%B: Relocation %s (%d) is not currently supported.\n"), + abfd, + reloc_entry->howto->name, + reloc_entry->howto->type); + + return bfd_reloc_notsupported; +} + +/* A cheesy little macro to make the code a little more readable. */ +#define HOW2MAP(bfd_rtype, mcore_rtype) \ + case bfd_rtype: return & mcore_coff_howto_table [mcore_rtype] + +static reloc_howto_type * +mcore_coff_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED, + bfd_reloc_code_real_type code) +{ + switch (code) + { + HOW2MAP (BFD_RELOC_32, IMAGE_REL_MCORE_ADDR32); + HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM8BY4, IMAGE_REL_MCORE_PCREL_IMM8BY4); + HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM11BY2, IMAGE_REL_MCORE_PCREL_IMM11BY2); + HOW2MAP (BFD_RELOC_MCORE_PCREL_IMM4BY2, IMAGE_REL_MCORE_PCREL_IMM4BY2); + HOW2MAP (BFD_RELOC_32_PCREL, IMAGE_REL_MCORE_PCREL_32); + HOW2MAP (BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2, IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2); + HOW2MAP (BFD_RELOC_RVA, IMAGE_REL_MCORE_RVA); + default: + return NULL; + } + /*NOTREACHED*/ +} +#undef HOW2MAP + +static reloc_howto_type * +mcore_coff_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; + i < (sizeof (mcore_coff_howto_table) + / sizeof (mcore_coff_howto_table[0])); + i++) + if (mcore_coff_howto_table[i].name != NULL + && strcasecmp (mcore_coff_howto_table[i].name, r_name) == 0) + return &mcore_coff_howto_table[i]; + + return NULL; +} + +#define RTYPE2HOWTO(cache_ptr, dst) \ + (cache_ptr)->howto = mcore_coff_howto_table + (dst)->r_type; + +static reloc_howto_type * +coff_mcore_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, + bfd_vma * addendp) +{ + reloc_howto_type * howto; + + if (rel->r_type >= NUM_ELEM (mcore_coff_howto_table)) + return NULL; + + howto = mcore_coff_howto_table + rel->r_type; + + if (rel->r_type == IMAGE_REL_MCORE_RVA) + * addendp -= pe_data (sec->output_section->owner)->pe_opthdr.ImageBase; + + else if (howto->pc_relative) + { + * addendp = sec->vma - 2; /* XXX guess - is this right ? */ + + /* If the symbol is defined, then the generic code is going to + add back the symbol value in order to cancel out an + adjustment it made to the addend. However, we set the addend + to 0 at the start of this function. We need to adjust here, + to avoid the adjustment the generic code will make. FIXME: + This is getting a bit hackish. */ + if (sym != NULL && sym->n_scnum != 0) + * addendp -= sym->n_value; + } + else + * addendp = 0; + + return howto; +} + +/* Return TRUE if this relocation should appear in the output .reloc section. + This function is referenced in pe_mkobject in peicode.h. */ + +static bfd_boolean +in_reloc_p (bfd * abfd ATTRIBUTE_UNUSED, reloc_howto_type * howto) +{ + return ! howto->pc_relative && howto->type != IMAGE_REL_MCORE_RVA; +} + +/* The reloc processing routine for the optimized COFF linker. */ +static bfd_boolean +coff_mcore_relocate_section (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; + + /* If we are performing a relocatable link, we don't need to do a + thing. The caller will take care of adjusting the reloc + addresses and symbol indices. */ + if (info->relocatable) + return TRUE; + + /* Check if we have the same endianness */ + if ( input_bfd->xvec->byteorder != output_bfd->xvec->byteorder + && output_bfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) + { + (*_bfd_error_handler) + (_("%B: compiled for a %s system and target is %s.\n"), + input_bfd, + bfd_big_endian (input_bfd) ? _("big endian") : _("little endian"), + bfd_big_endian (output_bfd) ? _("big endian") : _("little endian")); + + bfd_set_error (bfd_error_wrong_format); + return FALSE; + } + + rel = relocs; + relend = rel + input_section->reloc_count; + + for (; rel < relend; rel++) + { + long symndx; + struct internal_syment * sym; + bfd_vma val; + bfd_vma addend; + bfd_reloc_status_type rstat; + bfd_byte * loc; + unsigned short r_type = rel->r_type; + reloc_howto_type * howto = NULL; + struct coff_link_hash_entry * h; + const char * my_name; + + symndx = rel->r_symndx; + loc = contents + rel->r_vaddr - input_section->vma; + + if (symndx == -1) + { + h = NULL; + sym = NULL; + } + else + { + h = obj_coff_sym_hashes (input_bfd)[symndx]; + sym = syms + symndx; + } + + addend = 0; + + /* Get the howto and initialise the addend. */ + howto = bfd_coff_rtype_to_howto (input_bfd, input_section, rel, h, + sym, & addend); + if (howto == NULL) + return FALSE; + + val = 0; + + if (h == NULL) + { + if (symndx == -1) + my_name = "*ABS*"; + else + { + asection * sec = sections[symndx]; + + val = (sym->n_value + + sec->output_section->vma + + sec->output_offset); + + if (sym == NULL) + my_name = "*unknown*"; + else if ( sym->_n._n_n._n_zeroes == 0 + && sym->_n._n_n._n_offset != 0) + my_name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset; + else + { + static char buf [SYMNMLEN + 1]; + + strncpy (buf, sym->_n._n_name, SYMNMLEN); + buf[SYMNMLEN] = '\0'; + my_name = buf; + } + } + } + else + { + if ( h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + asection * sec = h->root.u.def.section; + + val = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else + { + if (! ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, input_section, + rel->r_vaddr - input_section->vma, TRUE))) + return FALSE; + } + + my_name = h->root.root.string; + } + + rstat = bfd_reloc_ok; + + /* Each case must do its own relocation, setting rstat appropriately. */ + switch (r_type) + { + default: + _bfd_error_handler (_("%B: unsupported relocation type 0x%02x"), + input_bfd, r_type); + bfd_set_error (bfd_error_bad_value); + return FALSE; + + case IMAGE_REL_MCORE_ABSOLUTE: + _bfd_error_handler + (_("Warning: unsupported reloc %s <file %B, section %A>\n" + "sym %ld (%s), r_vaddr %ld (%lx)"), + input_bfd, input_section, howto->name, + rel->r_symndx, my_name, (long) rel->r_vaddr, + (unsigned long) rel->r_vaddr); + break; + + case IMAGE_REL_MCORE_PCREL_IMM8BY4: + case IMAGE_REL_MCORE_PCREL_IMM11BY2: + case IMAGE_REL_MCORE_PCREL_IMM4BY2: + case IMAGE_REL_MCORE_PCREL_32: + case IMAGE_REL_MCORE_PCREL_JSR_IMM11BY2: + case IMAGE_REL_MCORE_ADDR32: + /* XXX fixme - shouldn't this be like the code for the RVA reloc ? */ + rstat = _bfd_relocate_contents (howto, input_bfd, val, loc); + break; + + case IMAGE_REL_MCORE_RVA: + rstat = _bfd_final_link_relocate + (howto, input_bfd, + input_section, contents, rel->r_vaddr - input_section->vma, + val, addend); + break; + } + + /* Emit a reloc if the backend thinks it needs it. */ + if (info->base_file + && sym + && pe_data (output_bfd)->in_reloc_p (output_bfd, howto) + && !mcore_emit_base_file_entry (info, output_bfd, input_section, + rel->r_vaddr)) + return FALSE; + + switch (rstat) + { + default: + abort (); + + case bfd_reloc_ok: + break; + + case bfd_reloc_overflow: + if (! ((*info->callbacks->reloc_overflow) + (info, (h ? &h->root : NULL), my_name, howto->name, + (bfd_vma) 0, input_bfd, + input_section, rel->r_vaddr - input_section->vma))) + return FALSE; + } + } + + return TRUE; +} + +/* Tailor coffcode.h -- macro heaven. */ + +/* We use the special COFF backend linker, with our own special touch. */ + +#define coff_bfd_reloc_type_lookup mcore_coff_reloc_type_lookup +#define coff_bfd_reloc_name_lookup mcore_coff_reloc_name_lookup +#define coff_relocate_section coff_mcore_relocate_section +#define coff_rtype_to_howto coff_mcore_rtype_to_howto + +#define SELECT_RELOC(internal, howto) {internal.r_type = howto->type;} + +/* Make sure that the 'r_offset' field is copied properly + so that identical binaries will compare the same. */ +#define SWAP_IN_RELOC_OFFSET H_GET_32 +#define SWAP_OUT_RELOC_OFFSET H_PUT_32 + +#define COFF_PAGE_SIZE 0x1000 + +#include "coffcode.h" + +/* Forward declaration to initialise alternative_target field. */ +extern const bfd_target TARGET_LITTLE_SYM; + +/* The transfer vectors that lead the outside world to all of the above. */ +CREATE_BIG_COFF_TARGET_VEC (TARGET_BIG_SYM, TARGET_BIG_NAME, D_PAGED, + (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES), + 0, & TARGET_LITTLE_SYM, COFF_SWAP_TABLE) +CREATE_LITTLE_COFF_TARGET_VEC (TARGET_LITTLE_SYM, TARGET_LITTLE_NAME, D_PAGED, + (SEC_CODE | SEC_DATA | SEC_DEBUGGING | SEC_READONLY | SEC_LINK_ONCE | SEC_LINK_DUPLICATES), + 0, & TARGET_BIG_SYM, COFF_SWAP_TABLE) |