| /* BFD back-end for WDC 65816 COFF binaries. |
| Copyright (C) 1995-2016 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 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 "bfdlink.h" |
| #include "coff/w65.h" |
| #include "coff/internal.h" |
| #include "libcoff.h" |
| |
| #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), |
| }; |
| |
| #define NUM_HOWTOS (sizeof (howto_table) / sizeof (howto_table[0])) |
| |
| /* 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 (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 (arelent *internal, |
| struct internal_reloc *dst) |
| { |
| if (dst->r_type > 0 && dst->r_type <= NUM_HOWTOS) |
| internal->howto = howto_table + dst->r_type - 1; |
| else |
| internal->howto = NULL; |
| } |
| |
| #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 (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_section_ptr->symbol_ptr_ptr; |
| |
| relent->addend = reloc->r_offset; |
| |
| relent->address -= section->vma; |
| /* relent->section = 0;*/ |
| } |
| |
| static int |
| w65_reloc16_estimate (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 (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 = (dst_address |
| + input_section->output_offset |
| + input_section->output_section->vma); |
| |
| gap -= dot + 1; |
| if (gap < -128 || gap > 127) |
| (*link_info->callbacks->reloc_overflow) |
| (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| reloc->howto->name, reloc->addend, input_section->owner, |
| input_section, reloc->address); |
| |
| 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 = (dst_address |
| + input_section->output_offset |
| + input_section->output_section->vma); |
| |
| /* This wraps within the page, so ignore the relativeness, look at the |
| high part. */ |
| if ((gap & 0xf0000) != (dot & 0xf0000)) |
| (*link_info->callbacks->reloc_overflow) |
| (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| reloc->howto->name, reloc->addend, input_section->owner, |
| input_section, reloc->address); |
| |
| 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 |
| |
| #ifndef bfd_pe_print_pdata |
| #define bfd_pe_print_pdata NULL |
| #endif |
| |
| #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_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE) |