/* BFD back-end for raw ARM a.out binaries. Copyright (C) 1994-2014 Free Software Foundation, Inc. Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org) 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" /* Avoid multiple definitions from aoutx if supporting standard a.out as well as our own. */ /* Do not "beautify" the CONCAT* macro args. Traditional C will not remove whitespace added here, and thus will fail to concatenate the tokens. */ #define NAME(x,y) CONCAT3 (aoutarm,_32_,y) #define N_TXTADDR(x) \ ((N_MAGIC (x) == NMAGIC) \ ? (bfd_vma) 0x8000 \ : ((N_MAGIC (x) != ZMAGIC) \ ? (bfd_vma) 0 \ : ((N_SHARED_LIB (x)) \ ? ((x).a_entry & ~(bfd_vma) (TARGET_PAGE_SIZE - 1)) \ : (bfd_vma) TEXT_START_ADDR))) #define TEXT_START_ADDR 0x8000 #define TARGET_PAGE_SIZE 0x8000 #define SEGMENT_SIZE TARGET_PAGE_SIZE #define DEFAULT_ARCH bfd_arch_arm #define MY(OP) CONCAT2 (arm_aout_,OP) #define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \ (((x).a_info & ~006000) != OMAGIC) && \ ((x).a_info != NMAGIC)) #define N_MAGIC(x) ((x).a_info & ~07200) #define MY_bfd_reloc_type_lookup arm_aout_bfd_reloc_type_lookup #define MY_bfd_reloc_name_lookup arm_aout_bfd_reloc_name_lookup #include "libaout.h" #include "aout/aout64.h" static bfd_reloc_status_type MY (fix_pcrel_26) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); static bfd_reloc_status_type MY (fix_pcrel_26_done) (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); reloc_howto_type MY (howto_table)[] = { /* Type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone. */ HOWTO (0, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "8", TRUE, 0x000000ff, 0x000000ff, FALSE), HOWTO (1, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 0, "16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), HOWTO (2, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "32", TRUE, 0xffffffff, 0xffffffff, FALSE), HOWTO (3, 2, 2, 26, TRUE, 0, complain_overflow_signed, MY (fix_pcrel_26), "ARM26", TRUE, 0x00ffffff, 0x00ffffff, TRUE), HOWTO (4, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0, "DISP8", TRUE, 0x000000ff, 0x000000ff, TRUE), HOWTO (5, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0, "DISP16", TRUE, 0x0000ffff, 0x0000ffff, TRUE), HOWTO (6, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0, "DISP32", TRUE, 0xffffffff, 0xffffffff, TRUE), HOWTO (7, 2, 2, 26, FALSE, 0, complain_overflow_signed, MY (fix_pcrel_26_done), "ARM26D", TRUE, 0x0, 0x0, FALSE), EMPTY_HOWTO (-1), HOWTO (9, 0, -1, 16, FALSE, 0, complain_overflow_bitfield, 0, "NEG16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), HOWTO (10, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, 0, "NEG32", TRUE, 0xffffffff, 0xffffffff, FALSE) }; #define RELOC_ARM_BITS_NEG_BIG ((unsigned int) 0x08) #define RELOC_ARM_BITS_NEG_LITTLE ((unsigned int) 0x10) static reloc_howto_type * MY (reloc_howto) (bfd *abfd, struct reloc_std_external *rel, int *r_index, int *r_extern, int *r_pcrel) { unsigned int r_length; unsigned int r_pcrel_done; unsigned int r_neg; int howto_index; *r_pcrel = 0; if (bfd_header_big_endian (abfd)) { *r_index = ((rel->r_index[0] << 16) | (rel->r_index[1] << 8) | rel->r_index[2]); *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_BIG)); r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_BIG)); r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_BIG)); r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_BIG) >> RELOC_STD_BITS_LENGTH_SH_BIG); } else { *r_index = ((rel->r_index[2] << 16) | (rel->r_index[1] << 8) | rel->r_index[0]); *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE)); r_pcrel_done = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE)); r_neg = (0 != (rel->r_type[0] & RELOC_ARM_BITS_NEG_LITTLE)); r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE) >> RELOC_STD_BITS_LENGTH_SH_LITTLE); } howto_index = r_length + 4 * r_pcrel_done + 8 * r_neg; if (howto_index == 3) *r_pcrel = 1; return MY (howto_table) + howto_index; } #define MY_reloc_howto(BFD, REL, IN, EX, PC) \ MY (reloc_howto) (BFD, REL, &IN, &EX, &PC) static void MY (put_reloc) (bfd *abfd, int r_extern, int r_index, bfd_vma value, reloc_howto_type *howto, struct reloc_std_external *reloc) { unsigned int r_length; int r_pcrel; int r_neg; PUT_WORD (abfd, value, reloc->r_address); /* Size as a power of two. */ r_length = howto->size; /* Special case for branch relocations. */ if (howto->type == 3 || howto->type == 7) r_length = 3; r_pcrel = howto->type & 4; /* PC Relative done? */ r_neg = howto->type & 8; /* Negative relocation. */ if (bfd_header_big_endian (abfd)) { reloc->r_index[0] = r_index >> 16; reloc->r_index[1] = r_index >> 8; reloc->r_index[2] = r_index; reloc->r_type[0] = ((r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0) | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0) | (r_neg ? RELOC_ARM_BITS_NEG_BIG : 0) | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG)); } else { reloc->r_index[2] = r_index >> 16; reloc->r_index[1] = r_index >> 8; reloc->r_index[0] = r_index; reloc->r_type[0] = ((r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0) | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0) | (r_neg ? RELOC_ARM_BITS_NEG_LITTLE : 0) | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)); } } #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \ MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC) static void MY (relocatable_reloc) (reloc_howto_type *howto, bfd *abfd, struct reloc_std_external *reloc, bfd_vma *amount, bfd_vma r_addr) { if (howto->type == 3) { if (reloc->r_type[0] & (bfd_header_big_endian (abfd) ? RELOC_STD_BITS_EXTERN_BIG : RELOC_STD_BITS_EXTERN_LITTLE)) /* The reloc is still external, so don't modify anything. */ *amount = 0; else { *amount -= r_addr; /* Change the r_pcrel value -- on the ARM, this bit is set once the relocation is done. */ if (bfd_header_big_endian (abfd)) reloc->r_type[0] |= RELOC_STD_BITS_PCREL_BIG; else reloc->r_type[0] |= RELOC_STD_BITS_PCREL_LITTLE; } } else if (howto->type == 7) *amount = 0; } #define MY_relocatable_reloc(HOW, BFD, REL, AMOUNT, ADDR) \ MY (relocatable_reloc) (HOW, BFD, REL, &(AMOUNT), ADDR) static bfd_reloc_status_type MY (fix_pcrel_26_done) (bfd *abfd ATTRIBUTE_UNUSED, arelent *reloc_entry ATTRIBUTE_UNUSED, asymbol *symbol ATTRIBUTE_UNUSED, void * data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED, bfd *output_bfd ATTRIBUTE_UNUSED, char **error_message ATTRIBUTE_UNUSED) { /* This is dead simple at present. */ return bfd_reloc_ok; } static bfd_reloc_status_type MY (fix_pcrel_26) (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void * data, asection *input_section, bfd *output_bfd, char **error_message ATTRIBUTE_UNUSED) { bfd_vma relocation; bfd_size_type addr = reloc_entry->address; bfd_vma target = bfd_get_32 (abfd, (bfd_byte *) data + addr); bfd_reloc_status_type flag = bfd_reloc_ok; /* If this is an undefined symbol, return error. */ if (bfd_is_und_section (symbol->section) && (symbol->flags & BSF_WEAK) == 0) return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined; /* If the sections are different, and we are doing a partial relocation, just ignore it for now. */ if (symbol->section->name != input_section->name && output_bfd != NULL) return bfd_reloc_ok; relocation = (target & 0x00ffffff) << 2; relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend. */ relocation += symbol->value; relocation += symbol->section->output_section->vma; relocation += symbol->section->output_offset; relocation += reloc_entry->addend; relocation -= input_section->output_section->vma; relocation -= input_section->output_offset; relocation -= addr; if (relocation & 3) return bfd_reloc_overflow; /* Check for overflow. */ if (relocation & 0x02000000) { if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff) flag = bfd_reloc_overflow; } else if (relocation & ~ (bfd_vma) 0x03ffffff) flag = bfd_reloc_overflow; target &= ~ (bfd_vma) 0x00ffffff; target |= (relocation >> 2) & 0x00ffffff; bfd_put_32 (abfd, target, (bfd_byte *) data + addr); /* Now the ARM magic... Change the reloc type so that it is marked as done. Strictly this is only necessary if we are doing a partial relocation. */ reloc_entry->howto = &MY (howto_table)[7]; return flag; } static reloc_howto_type * MY (bfd_reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code) { #define ASTD(i,j) case i: return & MY (howto_table)[j] if (code == BFD_RELOC_CTOR) switch (bfd_arch_bits_per_address (abfd)) { case 32: code = BFD_RELOC_32; break; default: return NULL; } switch (code) { ASTD (BFD_RELOC_16, 1); ASTD (BFD_RELOC_32, 2); ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3); ASTD (BFD_RELOC_8_PCREL, 4); ASTD (BFD_RELOC_16_PCREL, 5); ASTD (BFD_RELOC_32_PCREL, 6); default: return NULL; } } static reloc_howto_type * MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name) { unsigned int i; for (i = 0; i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]); i++) if (MY (howto_table)[i].name != NULL && strcasecmp (MY (howto_table)[i].name, r_name) == 0) return &MY (howto_table)[i]; return NULL; } #define MY_swap_std_reloc_in MY (swap_std_reloc_in) #define MY_swap_std_reloc_out MY (swap_std_reloc_out) #define MY_get_section_contents _bfd_generic_get_section_contents void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type); void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *); #include "aoutx.h" void MY_swap_std_reloc_in (bfd *abfd, struct reloc_std_external *bytes, arelent *cache_ptr, asymbol **symbols, bfd_size_type symcount ATTRIBUTE_UNUSED) { int r_index; int r_extern; int r_pcrel; struct aoutdata *su = &(abfd->tdata.aout_data->a); cache_ptr->address = H_GET_32 (abfd, bytes->r_address); cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel); MOVE_ADDRESS (0); } void MY_swap_std_reloc_out (bfd *abfd, arelent *g, struct reloc_std_external *natptr) { int r_index; asymbol *sym = *(g->sym_ptr_ptr); int r_extern; int r_length; int r_pcrel; int r_neg = 0; /* Negative relocs use the BASEREL bit. */ asection *output_section = sym->section->output_section; PUT_WORD (abfd, g->address, natptr->r_address); r_length = g->howto->size ; /* Size as a power of two. */ if (r_length < 0) { r_length = -r_length; r_neg = 1; } r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */ /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the relocation has been done already (Only for the 26-bit one I think). */ if (g->howto->type == 3) { r_length = 3; r_pcrel = 0; } else if (g->howto->type == 7) { r_length = 3; r_pcrel = 1; } /* Name was clobbered by aout_write_syms to be symbol index. */ /* If this relocation is relative to a symbol then set the r_index to the symbols index, and the r_extern bit. Absolute symbols can come in in two ways, either as an offset from the abs section, or as a symbol which has an abs value. check for that here. */ if (bfd_is_com_section (output_section) || bfd_is_abs_section (output_section) || bfd_is_und_section (output_section)) { if (bfd_abs_section_ptr->symbol == sym) { /* Whoops, looked like an abs symbol, but is really an offset from the abs section. */ r_index = 0; r_extern = 0; } else { /* Fill in symbol. */ r_extern = 1; r_index = (*(g->sym_ptr_ptr))->KEEPIT; } } else { /* Just an ordinary section. */ r_extern = 0; r_index = output_section->target_index; } /* Now the fun stuff. */ if (bfd_header_big_endian (abfd)) { natptr->r_index[0] = r_index >> 16; natptr->r_index[1] = r_index >> 8; natptr->r_index[2] = r_index; natptr->r_type[0] = ( (r_extern ? RELOC_STD_BITS_EXTERN_BIG: 0) | (r_pcrel ? RELOC_STD_BITS_PCREL_BIG: 0) | (r_neg ? RELOC_ARM_BITS_NEG_BIG: 0) | (r_length << RELOC_STD_BITS_LENGTH_SH_BIG)); } else { natptr->r_index[2] = r_index >> 16; natptr->r_index[1] = r_index >> 8; natptr->r_index[0] = r_index; natptr->r_type[0] = ( (r_extern ? RELOC_STD_BITS_EXTERN_LITTLE: 0) | (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE: 0) | (r_neg ? RELOC_ARM_BITS_NEG_LITTLE: 0) | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE)); } } #define MY_BFD_TARGET #include "aout-target.h" extern const bfd_target arm_aout_be_vec; const bfd_target arm_aout_le_vec = { "a.out-arm-little", /* Name. */ bfd_target_aout_flavour, BFD_ENDIAN_LITTLE, /* Target byte order (little). */ BFD_ENDIAN_LITTLE, /* Target headers byte order (little). */ (HAS_RELOC | EXEC_P | /* Object flags. */ HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED), (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), MY_symbol_leading_char, AR_PAD_CHAR, /* AR_pad_char. */ 15, /* AR_max_namelen. */ 0, /* match priority. */ 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, /* Headers. */ {_bfd_dummy_target, MY_object_p, /* bfd_check_format. */ bfd_generic_archive_p, MY_core_file_p}, {bfd_false, MY_mkobject, /* bfd_set_format. */ _bfd_generic_mkarchive, bfd_false}, {bfd_false, MY_write_object_contents, /* bfd_write_contents. */ _bfd_write_archive_contents, bfd_false}, BFD_JUMP_TABLE_GENERIC (MY), BFD_JUMP_TABLE_COPY (MY), BFD_JUMP_TABLE_CORE (MY), BFD_JUMP_TABLE_ARCHIVE (MY), BFD_JUMP_TABLE_SYMBOLS (MY), BFD_JUMP_TABLE_RELOCS (MY), BFD_JUMP_TABLE_WRITE (MY), BFD_JUMP_TABLE_LINK (MY), BFD_JUMP_TABLE_DYNAMIC (MY), & arm_aout_be_vec, (void *) MY_backend_data, }; const bfd_target arm_aout_be_vec = { "a.out-arm-big", /* Name. */ bfd_target_aout_flavour, BFD_ENDIAN_BIG, /* Target byte order (big). */ BFD_ENDIAN_BIG, /* Target headers byte order (big). */ (HAS_RELOC | EXEC_P | /* Object flags. */ HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED), (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA), MY_symbol_leading_char, AR_PAD_CHAR, /* AR_pad_char. */ 15, /* AR_max_namelen. */ 0, /* match priority. */ bfd_getb64, bfd_getb_signed_64, bfd_putb64, bfd_getb32, bfd_getb_signed_32, bfd_putb32, bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* 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, /* Headers. */ {_bfd_dummy_target, MY_object_p, /* bfd_check_format. */ bfd_generic_archive_p, MY_core_file_p}, {bfd_false, MY_mkobject, /* bfd_set_format. */ _bfd_generic_mkarchive, bfd_false}, {bfd_false, MY_write_object_contents, /* bfd_write_contents. */ _bfd_write_archive_contents, bfd_false}, BFD_JUMP_TABLE_GENERIC (MY), BFD_JUMP_TABLE_COPY (MY), BFD_JUMP_TABLE_CORE (MY), BFD_JUMP_TABLE_ARCHIVE (MY), BFD_JUMP_TABLE_SYMBOLS (MY), BFD_JUMP_TABLE_RELOCS (MY), BFD_JUMP_TABLE_WRITE (MY), BFD_JUMP_TABLE_LINK (MY), BFD_JUMP_TABLE_DYNAMIC (MY), & arm_aout_le_vec, (void *) MY_backend_data, };