| 1 | /* BFD back-end for Zilog Z80 COFF binaries. |
| 2 | Copyright 2005 Free Software Foundation, Inc. |
| 3 | Contributed by Arnold Metselaar <arnold_m@operamail.com> |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "bfdlink.h" |
| 26 | #include "coff/z80.h" |
| 27 | #include "coff/internal.h" |
| 28 | #include "libcoff.h" |
| 29 | |
| 30 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0 |
| 31 | |
| 32 | static reloc_howto_type r_imm32 = |
| 33 | HOWTO (R_IMM32, 0, 1, 32, FALSE, 0, |
| 34 | complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff, |
| 35 | FALSE); |
| 36 | |
| 37 | static reloc_howto_type r_imm24 = |
| 38 | HOWTO (R_IMM24, 0, 1, 24, FALSE, 0, |
| 39 | complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff, |
| 40 | FALSE); |
| 41 | |
| 42 | static reloc_howto_type r_imm16 = |
| 43 | HOWTO (R_IMM16, 0, 1, 16, FALSE, 0, |
| 44 | complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff, |
| 45 | FALSE); |
| 46 | |
| 47 | static reloc_howto_type r_imm8 = |
| 48 | HOWTO (R_IMM8, 0, 0, 8, FALSE, 0, |
| 49 | complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff, |
| 50 | FALSE); |
| 51 | |
| 52 | static reloc_howto_type r_jr = |
| 53 | HOWTO (R_JR, 0, 0, 8, TRUE, 0, |
| 54 | complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF, |
| 55 | FALSE); |
| 56 | |
| 57 | static reloc_howto_type r_off8 = |
| 58 | HOWTO (R_OFF8, 0, 0, 8, FALSE, 0, |
| 59 | complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff, |
| 60 | FALSE); |
| 61 | |
| 62 | |
| 63 | #define BADMAG(x) Z80BADMAG(x) |
| 64 | #define Z80 1 /* Customize coffcode.h. */ |
| 65 | #define __A_MAGIC_SET__ |
| 66 | |
| 67 | /* Code to swap in the reloc. */ |
| 68 | |
| 69 | #define SWAP_IN_RELOC_OFFSET H_GET_32 |
| 70 | #define SWAP_OUT_RELOC_OFFSET H_PUT_32 |
| 71 | |
| 72 | #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \ |
| 73 | dst->r_stuff[0] = 'S'; \ |
| 74 | dst->r_stuff[1] = 'C'; |
| 75 | |
| 76 | /* Code to turn a r_type into a howto ptr, uses the above howto table. */ |
| 77 | |
| 78 | static void |
| 79 | rtype2howto (arelent *internal, struct internal_reloc *dst) |
| 80 | { |
| 81 | switch (dst->r_type) |
| 82 | { |
| 83 | default: |
| 84 | abort (); |
| 85 | break; |
| 86 | case R_IMM8: |
| 87 | internal->howto = &r_imm8; |
| 88 | break; |
| 89 | case R_IMM16: |
| 90 | internal->howto = &r_imm16; |
| 91 | break; |
| 92 | case R_IMM24: |
| 93 | internal->howto = &r_imm24; |
| 94 | break; |
| 95 | case R_IMM32: |
| 96 | internal->howto = &r_imm32; |
| 97 | break; |
| 98 | case R_JR: |
| 99 | internal->howto = &r_jr; |
| 100 | break; |
| 101 | case R_OFF8: |
| 102 | internal->howto = &r_off8; |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry) |
| 108 | |
| 109 | static reloc_howto_type * |
| 110 | coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 111 | bfd_reloc_code_real_type code) |
| 112 | { |
| 113 | switch (code) |
| 114 | { |
| 115 | case BFD_RELOC_8: return & r_imm8; |
| 116 | case BFD_RELOC_16: return & r_imm16; |
| 117 | case BFD_RELOC_24: return & r_imm24; |
| 118 | case BFD_RELOC_32: return & r_imm32; |
| 119 | case BFD_RELOC_8_PCREL: return & r_jr; |
| 120 | case BFD_RELOC_Z80_DISP8: return & r_off8; |
| 121 | default: BFD_FAIL (); |
| 122 | return NULL; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* Perform any necessary magic to the addend in a reloc entry. */ |
| 127 | |
| 128 | #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ |
| 129 | cache_ptr->addend = ext_reloc.r_offset; |
| 130 | |
| 131 | #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \ |
| 132 | reloc_processing(relent, reloc, symbols, abfd, section) |
| 133 | |
| 134 | static void |
| 135 | reloc_processing (arelent *relent, |
| 136 | struct internal_reloc *reloc, |
| 137 | asymbol **symbols, |
| 138 | bfd *abfd, |
| 139 | asection *section) |
| 140 | { |
| 141 | relent->address = reloc->r_vaddr; |
| 142 | rtype2howto (relent, reloc); |
| 143 | |
| 144 | if (reloc->r_symndx > 0) |
| 145 | relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; |
| 146 | else |
| 147 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 148 | |
| 149 | relent->addend = reloc->r_offset; |
| 150 | relent->address -= section->vma; |
| 151 | } |
| 152 | |
| 153 | static void |
| 154 | extra_case (bfd *in_abfd, |
| 155 | struct bfd_link_info *link_info, |
| 156 | struct bfd_link_order *link_order, |
| 157 | arelent *reloc, |
| 158 | bfd_byte *data, |
| 159 | unsigned int *src_ptr, |
| 160 | unsigned int *dst_ptr) |
| 161 | { |
| 162 | asection * input_section = link_order->u.indirect.section; |
| 163 | int val; |
| 164 | |
| 165 | switch (reloc->howto->type) |
| 166 | { |
| 167 | case R_OFF8: |
| 168 | val = bfd_coff_reloc16_get_value (reloc, link_info, |
| 169 | input_section); |
| 170 | if (val>127 || val<-128) /* Test for overflow. */ |
| 171 | { |
| 172 | if (! ((*link_info->callbacks->reloc_overflow) |
| 173 | (link_info, NULL, |
| 174 | bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 175 | reloc->howto->name, reloc->addend, input_section->owner, |
| 176 | input_section, reloc->address))) |
| 177 | abort (); |
| 178 | } |
| 179 | bfd_put_8 (in_abfd, val, data + *dst_ptr); |
| 180 | (*dst_ptr) += 1; |
| 181 | (*src_ptr) += 1; |
| 182 | break; |
| 183 | |
| 184 | case R_IMM8: |
| 185 | val = bfd_get_8 ( in_abfd, data+*src_ptr) |
| 186 | + bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 187 | bfd_put_8 (in_abfd, val, data + *dst_ptr); |
| 188 | (*dst_ptr) += 1; |
| 189 | (*src_ptr) += 1; |
| 190 | break; |
| 191 | |
| 192 | case R_IMM16: |
| 193 | val = bfd_get_16 ( in_abfd, data+*src_ptr) |
| 194 | + bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 195 | bfd_put_16 (in_abfd, val, data + *dst_ptr); |
| 196 | (*dst_ptr) += 2; |
| 197 | (*src_ptr) += 2; |
| 198 | break; |
| 199 | |
| 200 | case R_IMM24: |
| 201 | val = bfd_get_16 ( in_abfd, data+*src_ptr) |
| 202 | + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16) |
| 203 | + bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 204 | bfd_put_16 (in_abfd, val, data + *dst_ptr); |
| 205 | bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2); |
| 206 | (*dst_ptr) += 3; |
| 207 | (*src_ptr) += 3; |
| 208 | break; |
| 209 | |
| 210 | case R_IMM32: |
| 211 | val = bfd_get_32 ( in_abfd, data+*src_ptr) |
| 212 | + bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 213 | bfd_put_32 (in_abfd, val, data + *dst_ptr); |
| 214 | (*dst_ptr) += 4; |
| 215 | (*src_ptr) += 4; |
| 216 | break; |
| 217 | |
| 218 | case R_JR: |
| 219 | { |
| 220 | bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info, |
| 221 | input_section); |
| 222 | bfd_vma dot = (*dst_ptr |
| 223 | + input_section->output_offset |
| 224 | + input_section->output_section->vma); |
| 225 | int gap = dst - dot - 1; /* -1, Since the offset is relative |
| 226 | to the value of PC after reading |
| 227 | the offset. */ |
| 228 | |
| 229 | if (gap >= 128 || gap < -128) |
| 230 | { |
| 231 | if (! ((*link_info->callbacks->reloc_overflow) |
| 232 | (link_info, NULL, |
| 233 | bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 234 | reloc->howto->name, reloc->addend, input_section->owner, |
| 235 | input_section, reloc->address))) |
| 236 | abort (); |
| 237 | } |
| 238 | bfd_put_8 (in_abfd, gap, data + *dst_ptr); |
| 239 | (*dst_ptr)++; |
| 240 | (*src_ptr)++; |
| 241 | break; |
| 242 | } |
| 243 | |
| 244 | default: |
| 245 | abort (); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | #define coff_reloc16_extra_cases extra_case |
| 250 | #define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup |
| 251 | |
| 252 | #include "coffcode.h" |
| 253 | |
| 254 | #undef coff_bfd_get_relocated_section_contents |
| 255 | #define coff_bfd_get_relocated_section_contents \ |
| 256 | bfd_coff_reloc16_get_relocated_section_contents |
| 257 | |
| 258 | #undef coff_bfd_relax_section |
| 259 | #define coff_bfd_relax_section bfd_coff_reloc16_relax_section |
| 260 | |
| 261 | CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL, |
| 262 | COFF_SWAP_TABLE) |
| 263 | |