/* BFD back-end for WDC 65816 COFF binaries. Copyright 1995, 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc. Written by Steve Chamberlain, <sac@cygnus.com>. 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "bfdlink.h" #include "coff/w65.h" #include "coff/internal.h" #include "libcoff.h" static int select_reloc PARAMS ((reloc_howto_type *)); static void rtype2howto PARAMS ((arelent *, struct internal_reloc *)); static void reloc_processing PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *)); static int w65_reloc16_estimate PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *)); static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *)); #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1) static reloc_howto_type howto_table[] = { HOWTO (R_W65_ABS8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "abs8", true, 0x000000ff, 0x000000ff, false), HOWTO (R_W65_ABS16, 1, 0, 16, false, 0, complain_overflow_bitfield, 0, "abs16", true, 0x0000ffff, 0x0000ffff, false), HOWTO (R_W65_ABS24, 0, 2, 32, false, 0, complain_overflow_bitfield, 0, "abs24", true, 0x00ffffff, 0x00ffffff, false), HOWTO (R_W65_ABS8S8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, ">abs8", true, 0x000000ff, 0x000000ff, false), HOWTO (R_W65_ABS8S16, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "^abs8", true, 0x000000ff, 0x000000ff, false), HOWTO (R_W65_ABS16S8, 1, 0, 16, false, 0, complain_overflow_bitfield, 0, ">abs16", true, 0x0000ffff, 0x0000ffff, false), HOWTO (R_W65_ABS16S16,1, 0, 16, false, 0, complain_overflow_bitfield, 0, "^abs16", true, 0x0000ffff, 0x0000ffff, false), HOWTO (R_W65_PCR8, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "pcrel8", true, 0x000000ff, 0x000000ff, true), HOWTO (R_W65_PCR16, 1, 0, 16, false, 0, complain_overflow_bitfield, 0, "pcrel16", true, 0x0000ffff, 0x0000ffff, true), HOWTO (R_W65_DP, 0, 0, 8, false, 0, complain_overflow_bitfield, 0, "dp", true, 0x000000ff, 0x000000ff, false), }; /* Turn a howto into a reloc number. */ #define SELECT_RELOC(x,howto) \ { x.r_type = select_reloc(howto); } #define BADMAG(x) (W65BADMAG(x)) #define W65 1 /* Customize coffcode.h */ #define __A_MAGIC_SET__ /* Code to swap in the reloc */ #define SWAP_IN_RELOC_OFFSET H_GET_32 #define SWAP_OUT_RELOC_OFFSET H_PUT_32 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \ dst->r_stuff[0] = 'S'; \ dst->r_stuff[1] = 'C'; static int select_reloc (howto) reloc_howto_type *howto; { return howto->type ; } /* Code to turn a r_type into a howto ptr, uses the above howto table. */ static void rtype2howto (internal, dst) arelent *internal; struct internal_reloc *dst; { internal->howto = howto_table + dst->r_type - 1; } #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry) /* Perform any necessary magic to the addend in a reloc entry. */ #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ cache_ptr->addend = ext_reloc.r_offset; #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \ reloc_processing(relent, reloc, symbols, abfd, section) static void reloc_processing (relent, reloc, symbols, abfd, section) arelent * relent; struct internal_reloc *reloc; asymbol ** symbols; bfd * abfd; asection * section; { relent->address = reloc->r_vaddr; rtype2howto (relent, reloc); if (((int) reloc->r_symndx) > 0) relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; else relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol); relent->addend = reloc->r_offset; relent->address -= section->vma; /* relent->section = 0;*/ } static int w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info) bfd *abfd; asection *input_section; arelent *reloc; unsigned int shrink; struct bfd_link_info *link_info; { bfd_vma value; bfd_vma dot; bfd_vma gap; /* The address of the thing to be relocated will have moved back by the size of the shrink - but we don't change reloc->address here, since we need it to know where the relocation lives in the source uncooked section. */ /* reloc->address -= shrink; conceptual */ bfd_vma address = reloc->address - shrink; switch (reloc->howto->type) { case R_MOV16B2: case R_JMP2: shrink+=2; break; /* Thing is a move one byte. */ case R_MOV16B1: value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); if (value >= 0xff00) { /* Change the reloc type from 16bit, possible 8 to 8bit possible 16. */ reloc->howto = reloc->howto + 1; /* The place to relc moves back by one. */ /* This will be two bytes smaller in the long run. */ shrink += 2; bfd_perform_slip (abfd, 2, input_section, address); } break; /* This is the 24 bit branch which could become an 8 bitter, the relocation points to the first byte of the insn, not the actual data. */ case R_JMPL1: value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); dot = input_section->output_section->vma + input_section->output_offset + address; /* See if the address we're looking at within 127 bytes of where we are, if so then we can use a small branch rather than the jump we were going to. */ gap = value - dot; if (-120 < (long) gap && (long) gap < 120) { /* Change the reloc type from 24bit, possible 8 to 8bit possible 32. */ reloc->howto = reloc->howto + 1; /* This will be two bytes smaller in the long run. */ shrink += 2; bfd_perform_slip (abfd, 2, input_section, address); } break; case R_JMP1: value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); dot = input_section->output_section->vma + input_section->output_offset + address; /* See if the address we're looking at within 127 bytes of where we are, if so then we can use a small branch rather than the jump we were going to. */ gap = value - (dot - shrink); if (-120 < (long) gap && (long) gap < 120) { /* Change the reloc type from 16bit, possible 8 to 8bit possible 16. */ reloc->howto = reloc->howto + 1; /* The place to relc moves back by one. */ /* This will be two bytes smaller in the long run. */ shrink += 2; bfd_perform_slip (abfd, 2, input_section, address); } break; } return shrink; } /* First phase of a relaxing link. */ /* Reloc types large small R_MOV16B1 R_MOV16B2 mov.b with 16bit or 8 bit address R_JMP1 R_JMP2 jmp or pcrel branch R_JMPL1 R_JMPL_B8 24jmp or pcrel branch R_MOV24B1 R_MOV24B2 24 or 8 bit reloc for mov.b */ static void w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr, dst_ptr) bfd *abfd; struct bfd_link_info *link_info; struct bfd_link_order *link_order; arelent *reloc; bfd_byte *data; unsigned int *src_ptr; unsigned int *dst_ptr; { unsigned int src_address = *src_ptr; unsigned int dst_address = *dst_ptr; asection *input_section = link_order->u.indirect.section; switch (reloc->howto->type) { case R_W65_ABS8: case R_W65_DP: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); bfd_put_8 (abfd, gap, data + dst_address); dst_address += 1; src_address += 1; } break; case R_W65_ABS8S8: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); gap >>= 8; bfd_put_8 (abfd, gap, data + dst_address); dst_address += 1; src_address += 1; } break; case R_W65_ABS8S16: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); gap >>= 16; bfd_put_8 (abfd, gap, data + dst_address); dst_address += 1; src_address += 1; } break; case R_W65_ABS16: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); dst_address += 2; src_address += 2; } break; case R_W65_ABS16S8: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); gap >>= 8; bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); dst_address += 2; src_address += 2; } break; case R_W65_ABS16S16: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); gap >>= 16; bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); dst_address += 2; src_address += 2; } break; case R_W65_ABS24: { unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); bfd_put_8 (abfd, gap >> 16, data+dst_address + 2); dst_address += 3; src_address += 3; } break; case R_W65_PCR8: { int gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); bfd_vma dot = link_order->offset + dst_address + link_order->u.indirect.section->output_section->vma; gap -= dot + 1; if (gap < -128 || gap > 127) { if (! ((*link_info->callbacks->reloc_overflow) (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr), reloc->howto->name, reloc->addend, input_section->owner, input_section, reloc->address))) abort (); } bfd_put_8 (abfd, gap, data + dst_address); dst_address += 1; src_address += 1; } break; case R_W65_PCR16: { bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info, input_section); bfd_vma dot = link_order->offset + dst_address + link_order->u.indirect.section->output_section->vma; /* This wraps within the page, so ignore the relativeness, look at the high part. */ if ((gap & 0xf0000) != (dot & 0xf0000)) { if (! ((*link_info->callbacks->reloc_overflow) (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr), reloc->howto->name, reloc->addend, input_section->owner, input_section, reloc->address))) abort (); } gap -= dot + 2; bfd_put_16 (abfd, gap, data + dst_address); dst_address += 2; src_address += 2; } break; default: printf (_("ignoring reloc %s\n"), reloc->howto->name); break; } *src_ptr = src_address; *dst_ptr = dst_address; } #define coff_reloc16_extra_cases w65_reloc16_extra_cases #define coff_reloc16_estimate w65_reloc16_estimate #include "coffcode.h" #undef coff_bfd_get_relocated_section_contents #undef coff_bfd_relax_section #define coff_bfd_get_relocated_section_contents \ bfd_coff_reloc16_get_relocated_section_contents #define coff_bfd_relax_section bfd_coff_reloc16_relax_section CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL)