1 /* BFD back-end for WDC 65816 COFF binaries. 2 Copyright (C) 1995-2014 Free Software Foundation, Inc. 3 Written by Steve Chamberlain, <sac (at) cygnus.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 3 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 "sysdep.h" 23 #include "bfd.h" 24 #include "libbfd.h" 25 #include "bfdlink.h" 26 #include "coff/w65.h" 27 #include "coff/internal.h" 28 #include "libcoff.h" 29 30 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1) 31 static reloc_howto_type howto_table[] = 32 { 33 HOWTO (R_W65_ABS8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), 34 HOWTO (R_W65_ABS16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), 35 HOWTO (R_W65_ABS24, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE), 36 HOWTO (R_W65_ABS8S8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), 37 HOWTO (R_W65_ABS8S16, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), 38 HOWTO (R_W65_ABS16S8, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), 39 HOWTO (R_W65_ABS16S16,1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), 40 HOWTO (R_W65_PCR8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE), 41 HOWTO (R_W65_PCR16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE), 42 HOWTO (R_W65_DP, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE), 43 }; 44 45 /* Turn a howto into a reloc number. */ 46 47 #define SELECT_RELOC(x,howto) \ 48 { x.r_type = select_reloc(howto); } 49 50 #define BADMAG(x) (W65BADMAG(x)) 51 #define W65 1 /* Customize coffcode.h */ 52 #define __A_MAGIC_SET__ 53 54 /* Code to swap in the reloc */ 55 #define SWAP_IN_RELOC_OFFSET H_GET_32 56 #define SWAP_OUT_RELOC_OFFSET H_PUT_32 57 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \ 58 dst->r_stuff[0] = 'S'; \ 59 dst->r_stuff[1] = 'C'; 60 61 static int 62 select_reloc (reloc_howto_type *howto) 63 { 64 return howto->type ; 65 } 66 67 /* Code to turn a r_type into a howto ptr, uses the above howto table. */ 68 69 static void 70 rtype2howto (arelent *internal, 71 struct internal_reloc *dst) 72 { 73 internal->howto = howto_table + dst->r_type - 1; 74 } 75 76 #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry) 77 78 /* Perform any necessary magic to the addend in a reloc entry. */ 79 80 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ 81 cache_ptr->addend = ext_reloc.r_offset; 82 83 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \ 84 reloc_processing(relent, reloc, symbols, abfd, section) 85 86 static void 87 reloc_processing (arelent * relent, 88 struct internal_reloc *reloc, 89 asymbol ** symbols, 90 bfd * abfd, 91 asection * section) 92 { 93 relent->address = reloc->r_vaddr; 94 rtype2howto (relent, reloc); 95 96 if (((int) reloc->r_symndx) > 0) 97 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; 98 else 99 relent->sym_ptr_ptr = (asymbol **) bfd_abs_section_ptr->symbol_ptr_ptr; 100 101 relent->addend = reloc->r_offset; 102 103 relent->address -= section->vma; 104 /* relent->section = 0;*/ 105 } 106 107 static int 108 w65_reloc16_estimate (bfd *abfd, 109 asection *input_section, 110 arelent *reloc, 111 unsigned int shrink, 112 struct bfd_link_info *link_info) 113 { 114 bfd_vma value; 115 bfd_vma dot; 116 bfd_vma gap; 117 118 /* The address of the thing to be relocated will have moved back by 119 the size of the shrink - but we don't change reloc->address here, 120 since we need it to know where the relocation lives in the source 121 uncooked section. */ 122 123 /* reloc->address -= shrink; conceptual */ 124 125 bfd_vma address = reloc->address - shrink; 126 127 switch (reloc->howto->type) 128 { 129 case R_MOV16B2: 130 case R_JMP2: 131 shrink+=2; 132 break; 133 134 /* Thing is a move one byte. */ 135 case R_MOV16B1: 136 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); 137 138 if (value >= 0xff00) 139 { 140 /* Change the reloc type from 16bit, possible 8 to 8bit 141 possible 16. */ 142 reloc->howto = reloc->howto + 1; 143 /* The place to relc moves back by one. */ 144 /* This will be two bytes smaller in the long run. */ 145 shrink += 2; 146 bfd_perform_slip (abfd, 2, input_section, address); 147 } 148 149 break; 150 /* This is the 24 bit branch which could become an 8 bitter, 151 the relocation points to the first byte of the insn, not the 152 actual data. */ 153 154 case R_JMPL1: 155 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); 156 157 dot = input_section->output_section->vma + 158 input_section->output_offset + address; 159 160 /* See if the address we're looking at within 127 bytes of where 161 we are, if so then we can use a small branch rather than the 162 jump we were going to. */ 163 gap = value - dot; 164 165 if (-120 < (long) gap && (long) gap < 120) 166 { 167 /* Change the reloc type from 24bit, possible 8 to 8bit 168 possible 32. */ 169 reloc->howto = reloc->howto + 1; 170 /* This will be two bytes smaller in the long run. */ 171 shrink += 2; 172 bfd_perform_slip (abfd, 2, input_section, address); 173 } 174 break; 175 176 case R_JMP1: 177 value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); 178 179 dot = input_section->output_section->vma + 180 input_section->output_offset + address; 181 182 /* See if the address we're looking at within 127 bytes of where 183 we are, if so then we can use a small branch rather than the 184 jump we were going to. */ 185 gap = value - (dot - shrink); 186 187 if (-120 < (long) gap && (long) gap < 120) 188 { 189 /* Change the reloc type from 16bit, possible 8 to 8bit 190 possible 16. */ 191 reloc->howto = reloc->howto + 1; 192 /* The place to relc moves back by one. */ 193 194 /* This will be two bytes smaller in the long run. */ 195 shrink += 2; 196 bfd_perform_slip (abfd, 2, input_section, address); 197 } 198 break; 199 } 200 201 return shrink; 202 } 203 204 /* First phase of a relaxing link. */ 205 206 /* Reloc types 207 large small 208 R_MOV16B1 R_MOV16B2 mov.b with 16bit or 8 bit address 209 R_JMP1 R_JMP2 jmp or pcrel branch 210 R_JMPL1 R_JMPL_B8 24jmp or pcrel branch 211 R_MOV24B1 R_MOV24B2 24 or 8 bit reloc for mov.b */ 212 213 static void 214 w65_reloc16_extra_cases (bfd *abfd, 215 struct bfd_link_info *link_info, 216 struct bfd_link_order *link_order, 217 arelent *reloc, 218 bfd_byte *data, 219 unsigned int *src_ptr, 220 unsigned int *dst_ptr) 221 { 222 unsigned int src_address = *src_ptr; 223 unsigned int dst_address = *dst_ptr; 224 asection *input_section = link_order->u.indirect.section; 225 226 switch (reloc->howto->type) 227 { 228 case R_W65_ABS8: 229 case R_W65_DP: 230 { 231 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 232 input_section); 233 bfd_put_8 (abfd, gap, data + dst_address); 234 dst_address += 1; 235 src_address += 1; 236 } 237 break; 238 239 case R_W65_ABS8S8: 240 { 241 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 242 input_section); 243 gap >>= 8; 244 bfd_put_8 (abfd, gap, data + dst_address); 245 dst_address += 1; 246 src_address += 1; 247 } 248 break; 249 250 case R_W65_ABS8S16: 251 { 252 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 253 input_section); 254 gap >>= 16; 255 bfd_put_8 (abfd, gap, data + dst_address); 256 dst_address += 1; 257 src_address += 1; 258 } 259 break; 260 261 case R_W65_ABS16: 262 { 263 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 264 input_section); 265 266 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); 267 dst_address += 2; 268 src_address += 2; 269 } 270 break; 271 case R_W65_ABS16S8: 272 { 273 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 274 input_section); 275 gap >>= 8; 276 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); 277 dst_address += 2; 278 src_address += 2; 279 } 280 break; 281 case R_W65_ABS16S16: 282 { 283 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 284 input_section); 285 gap >>= 16; 286 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); 287 dst_address += 2; 288 src_address += 2; 289 } 290 break; 291 292 case R_W65_ABS24: 293 { 294 unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, 295 input_section); 296 bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); 297 bfd_put_8 (abfd, gap >> 16, data+dst_address + 2); 298 dst_address += 3; 299 src_address += 3; 300 } 301 break; 302 303 case R_W65_PCR8: 304 { 305 int gap = bfd_coff_reloc16_get_value (reloc, link_info, 306 input_section); 307 bfd_vma dot = (dst_address 308 + input_section->output_offset 309 + input_section->output_section->vma); 310 311 gap -= dot + 1; 312 if (gap < -128 || gap > 127) 313 { 314 if (! ((*link_info->callbacks->reloc_overflow) 315 (link_info, NULL, 316 bfd_asymbol_name (*reloc->sym_ptr_ptr), 317 reloc->howto->name, reloc->addend, input_section->owner, 318 input_section, reloc->address))) 319 abort (); 320 } 321 bfd_put_8 (abfd, gap, data + dst_address); 322 dst_address += 1; 323 src_address += 1; 324 } 325 break; 326 327 case R_W65_PCR16: 328 { 329 bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info, 330 input_section); 331 bfd_vma dot = (dst_address 332 + input_section->output_offset 333 + input_section->output_section->vma); 334 335 /* This wraps within the page, so ignore the relativeness, look at the 336 high part. */ 337 if ((gap & 0xf0000) != (dot & 0xf0000)) 338 { 339 if (! ((*link_info->callbacks->reloc_overflow) 340 (link_info, NULL, 341 bfd_asymbol_name (*reloc->sym_ptr_ptr), 342 reloc->howto->name, reloc->addend, input_section->owner, 343 input_section, reloc->address))) 344 abort (); 345 } 346 347 gap -= dot + 2; 348 bfd_put_16 (abfd, gap, data + dst_address); 349 dst_address += 2; 350 src_address += 2; 351 } 352 break; 353 default: 354 printf (_("ignoring reloc %s\n"), reloc->howto->name); 355 break; 356 357 } 358 *src_ptr = src_address; 359 *dst_ptr = dst_address; 360 } 361 362 #define coff_reloc16_extra_cases w65_reloc16_extra_cases 363 #define coff_reloc16_estimate w65_reloc16_estimate 364 365 #ifndef bfd_pe_print_pdata 366 #define bfd_pe_print_pdata NULL 367 #endif 368 369 #include "coffcode.h" 370 371 #undef coff_bfd_get_relocated_section_contents 372 #undef coff_bfd_relax_section 373 #define coff_bfd_get_relocated_section_contents \ 374 bfd_coff_reloc16_get_relocated_section_contents 375 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section 376 377 CREATE_LITTLE_COFF_TARGET_VEC (w65_coff_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE) 378
