| 1 | /* BFD back-end for WDC 65816 COFF binaries. |
| 2 | Copyright 1995, 1996, 1997, 1999, 2000, 2001, 2002 |
| 3 | Free Software Foundation, Inc. |
| 4 | Written by Steve Chamberlain, <sac@cygnus.com>. |
| 5 | |
| 6 | This file is part of BFD, the Binary File Descriptor library. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "bfd.h" |
| 23 | #include "sysdep.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 | static int select_reloc PARAMS ((reloc_howto_type *)); |
| 31 | static void rtype2howto PARAMS ((arelent *, struct internal_reloc *)); |
| 32 | static void reloc_processing PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *)); |
| 33 | static int w65_reloc16_estimate PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *)); |
| 34 | static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *)); |
| 35 | |
| 36 | #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1) |
| 37 | static reloc_howto_type howto_table[] = |
| 38 | { |
| 39 | HOWTO (R_W65_ABS8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), |
| 40 | HOWTO (R_W65_ABS16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), |
| 41 | HOWTO (R_W65_ABS24, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs24", TRUE, 0x00ffffff, 0x00ffffff, FALSE), |
| 42 | HOWTO (R_W65_ABS8S8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, ">abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), |
| 43 | HOWTO (R_W65_ABS8S16, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "^abs8", TRUE, 0x000000ff, 0x000000ff, FALSE), |
| 44 | HOWTO (R_W65_ABS16S8, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, ">abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), |
| 45 | HOWTO (R_W65_ABS16S16,1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "^abs16", TRUE, 0x0000ffff, 0x0000ffff, FALSE), |
| 46 | HOWTO (R_W65_PCR8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "pcrel8", TRUE, 0x000000ff, 0x000000ff, TRUE), |
| 47 | HOWTO (R_W65_PCR16, 1, 0, 16, FALSE, 0, complain_overflow_bitfield, 0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, TRUE), |
| 48 | HOWTO (R_W65_DP, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, 0, "dp", TRUE, 0x000000ff, 0x000000ff, FALSE), |
| 49 | }; |
| 50 | |
| 51 | /* Turn a howto into a reloc number. */ |
| 52 | |
| 53 | #define SELECT_RELOC(x,howto) \ |
| 54 | { x.r_type = select_reloc(howto); } |
| 55 | |
| 56 | #define BADMAG(x) (W65BADMAG(x)) |
| 57 | #define W65 1 /* Customize coffcode.h */ |
| 58 | #define __A_MAGIC_SET__ |
| 59 | |
| 60 | /* Code to swap in the reloc */ |
| 61 | #define SWAP_IN_RELOC_OFFSET H_GET_32 |
| 62 | #define SWAP_OUT_RELOC_OFFSET H_PUT_32 |
| 63 | #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \ |
| 64 | dst->r_stuff[0] = 'S'; \ |
| 65 | dst->r_stuff[1] = 'C'; |
| 66 | |
| 67 | static int |
| 68 | select_reloc (howto) |
| 69 | reloc_howto_type *howto; |
| 70 | { |
| 71 | return howto->type ; |
| 72 | } |
| 73 | |
| 74 | /* Code to turn a r_type into a howto ptr, uses the above howto table. */ |
| 75 | |
| 76 | static void |
| 77 | rtype2howto (internal, dst) |
| 78 | arelent *internal; |
| 79 | struct internal_reloc *dst; |
| 80 | { |
| 81 | internal->howto = howto_table + dst->r_type - 1; |
| 82 | } |
| 83 | |
| 84 | #define RTYPE2HOWTO(internal, relocentry) rtype2howto(internal,relocentry) |
| 85 | |
| 86 | /* Perform any necessary magic to the addend in a reloc entry. */ |
| 87 | |
| 88 | #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \ |
| 89 | cache_ptr->addend = ext_reloc.r_offset; |
| 90 | |
| 91 | #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \ |
| 92 | reloc_processing(relent, reloc, symbols, abfd, section) |
| 93 | |
| 94 | static void |
| 95 | reloc_processing (relent, reloc, symbols, abfd, section) |
| 96 | arelent * relent; |
| 97 | struct internal_reloc *reloc; |
| 98 | asymbol ** symbols; |
| 99 | bfd * abfd; |
| 100 | asection * section; |
| 101 | { |
| 102 | relent->address = reloc->r_vaddr; |
| 103 | rtype2howto (relent, reloc); |
| 104 | |
| 105 | if (((int) reloc->r_symndx) > 0) |
| 106 | relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx]; |
| 107 | else |
| 108 | relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol); |
| 109 | |
| 110 | relent->addend = reloc->r_offset; |
| 111 | |
| 112 | relent->address -= section->vma; |
| 113 | /* relent->section = 0;*/ |
| 114 | } |
| 115 | |
| 116 | static int |
| 117 | w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info) |
| 118 | bfd *abfd; |
| 119 | asection *input_section; |
| 120 | arelent *reloc; |
| 121 | unsigned int shrink; |
| 122 | struct bfd_link_info *link_info; |
| 123 | { |
| 124 | bfd_vma value; |
| 125 | bfd_vma dot; |
| 126 | bfd_vma gap; |
| 127 | |
| 128 | /* The address of the thing to be relocated will have moved back by |
| 129 | the size of the shrink - but we don't change reloc->address here, |
| 130 | since we need it to know where the relocation lives in the source |
| 131 | uncooked section. */ |
| 132 | |
| 133 | /* reloc->address -= shrink; conceptual */ |
| 134 | |
| 135 | bfd_vma address = reloc->address - shrink; |
| 136 | |
| 137 | switch (reloc->howto->type) |
| 138 | { |
| 139 | case R_MOV16B2: |
| 140 | case R_JMP2: |
| 141 | shrink+=2; |
| 142 | break; |
| 143 | |
| 144 | /* Thing is a move one byte. */ |
| 145 | case R_MOV16B1: |
| 146 | value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 147 | |
| 148 | if (value >= 0xff00) |
| 149 | { |
| 150 | /* Change the reloc type from 16bit, possible 8 to 8bit |
| 151 | possible 16. */ |
| 152 | reloc->howto = reloc->howto + 1; |
| 153 | /* The place to relc moves back by one. */ |
| 154 | /* This will be two bytes smaller in the long run. */ |
| 155 | shrink += 2; |
| 156 | bfd_perform_slip (abfd, 2, input_section, address); |
| 157 | } |
| 158 | |
| 159 | break; |
| 160 | /* This is the 24 bit branch which could become an 8 bitter, |
| 161 | the relocation points to the first byte of the insn, not the |
| 162 | actual data. */ |
| 163 | |
| 164 | case R_JMPL1: |
| 165 | value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 166 | |
| 167 | dot = input_section->output_section->vma + |
| 168 | input_section->output_offset + address; |
| 169 | |
| 170 | /* See if the address we're looking at within 127 bytes of where |
| 171 | we are, if so then we can use a small branch rather than the |
| 172 | jump we were going to. */ |
| 173 | gap = value - dot; |
| 174 | |
| 175 | if (-120 < (long) gap && (long) gap < 120) |
| 176 | { |
| 177 | /* Change the reloc type from 24bit, possible 8 to 8bit |
| 178 | possible 32. */ |
| 179 | reloc->howto = reloc->howto + 1; |
| 180 | /* This will be two bytes smaller in the long run. */ |
| 181 | shrink += 2; |
| 182 | bfd_perform_slip (abfd, 2, input_section, address); |
| 183 | } |
| 184 | break; |
| 185 | |
| 186 | case R_JMP1: |
| 187 | value = bfd_coff_reloc16_get_value (reloc, link_info, input_section); |
| 188 | |
| 189 | dot = input_section->output_section->vma + |
| 190 | input_section->output_offset + address; |
| 191 | |
| 192 | /* See if the address we're looking at within 127 bytes of where |
| 193 | we are, if so then we can use a small branch rather than the |
| 194 | jump we were going to. */ |
| 195 | gap = value - (dot - shrink); |
| 196 | |
| 197 | if (-120 < (long) gap && (long) gap < 120) |
| 198 | { |
| 199 | /* Change the reloc type from 16bit, possible 8 to 8bit |
| 200 | possible 16. */ |
| 201 | reloc->howto = reloc->howto + 1; |
| 202 | /* The place to relc moves back by one. */ |
| 203 | |
| 204 | /* This will be two bytes smaller in the long run. */ |
| 205 | shrink += 2; |
| 206 | bfd_perform_slip (abfd, 2, input_section, address); |
| 207 | } |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | return shrink; |
| 212 | } |
| 213 | |
| 214 | /* First phase of a relaxing link. */ |
| 215 | |
| 216 | /* Reloc types |
| 217 | large small |
| 218 | R_MOV16B1 R_MOV16B2 mov.b with 16bit or 8 bit address |
| 219 | R_JMP1 R_JMP2 jmp or pcrel branch |
| 220 | R_JMPL1 R_JMPL_B8 24jmp or pcrel branch |
| 221 | R_MOV24B1 R_MOV24B2 24 or 8 bit reloc for mov.b */ |
| 222 | |
| 223 | static void |
| 224 | w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr, |
| 225 | dst_ptr) |
| 226 | bfd *abfd; |
| 227 | struct bfd_link_info *link_info; |
| 228 | struct bfd_link_order *link_order; |
| 229 | arelent *reloc; |
| 230 | bfd_byte *data; |
| 231 | unsigned int *src_ptr; |
| 232 | unsigned int *dst_ptr; |
| 233 | { |
| 234 | unsigned int src_address = *src_ptr; |
| 235 | unsigned int dst_address = *dst_ptr; |
| 236 | asection *input_section = link_order->u.indirect.section; |
| 237 | |
| 238 | switch (reloc->howto->type) |
| 239 | { |
| 240 | case R_W65_ABS8: |
| 241 | case R_W65_DP: |
| 242 | { |
| 243 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 244 | input_section); |
| 245 | bfd_put_8 (abfd, gap, data + dst_address); |
| 246 | dst_address += 1; |
| 247 | src_address += 1; |
| 248 | } |
| 249 | break; |
| 250 | |
| 251 | case R_W65_ABS8S8: |
| 252 | { |
| 253 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 254 | input_section); |
| 255 | gap >>= 8; |
| 256 | bfd_put_8 (abfd, gap, data + dst_address); |
| 257 | dst_address += 1; |
| 258 | src_address += 1; |
| 259 | } |
| 260 | break; |
| 261 | |
| 262 | case R_W65_ABS8S16: |
| 263 | { |
| 264 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 265 | input_section); |
| 266 | gap >>= 16; |
| 267 | bfd_put_8 (abfd, gap, data + dst_address); |
| 268 | dst_address += 1; |
| 269 | src_address += 1; |
| 270 | } |
| 271 | break; |
| 272 | |
| 273 | case R_W65_ABS16: |
| 274 | { |
| 275 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 276 | input_section); |
| 277 | |
| 278 | bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); |
| 279 | dst_address += 2; |
| 280 | src_address += 2; |
| 281 | } |
| 282 | break; |
| 283 | case R_W65_ABS16S8: |
| 284 | { |
| 285 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 286 | input_section); |
| 287 | gap >>= 8; |
| 288 | bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); |
| 289 | dst_address += 2; |
| 290 | src_address += 2; |
| 291 | } |
| 292 | break; |
| 293 | case R_W65_ABS16S16: |
| 294 | { |
| 295 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 296 | input_section); |
| 297 | gap >>= 16; |
| 298 | bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); |
| 299 | dst_address += 2; |
| 300 | src_address += 2; |
| 301 | } |
| 302 | break; |
| 303 | |
| 304 | case R_W65_ABS24: |
| 305 | { |
| 306 | unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 307 | input_section); |
| 308 | bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address); |
| 309 | bfd_put_8 (abfd, gap >> 16, data+dst_address + 2); |
| 310 | dst_address += 3; |
| 311 | src_address += 3; |
| 312 | } |
| 313 | break; |
| 314 | |
| 315 | case R_W65_PCR8: |
| 316 | { |
| 317 | int gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 318 | input_section); |
| 319 | bfd_vma dot = link_order->offset |
| 320 | + dst_address |
| 321 | + link_order->u.indirect.section->output_section->vma; |
| 322 | |
| 323 | gap -= dot + 1; |
| 324 | if (gap < -128 || gap > 127) |
| 325 | { |
| 326 | if (! ((*link_info->callbacks->reloc_overflow) |
| 327 | (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 328 | reloc->howto->name, reloc->addend, input_section->owner, |
| 329 | input_section, reloc->address))) |
| 330 | abort (); |
| 331 | } |
| 332 | bfd_put_8 (abfd, gap, data + dst_address); |
| 333 | dst_address += 1; |
| 334 | src_address += 1; |
| 335 | } |
| 336 | break; |
| 337 | |
| 338 | case R_W65_PCR16: |
| 339 | { |
| 340 | bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info, |
| 341 | input_section); |
| 342 | bfd_vma dot = link_order->offset |
| 343 | + dst_address |
| 344 | + link_order->u.indirect.section->output_section->vma; |
| 345 | |
| 346 | /* This wraps within the page, so ignore the relativeness, look at the |
| 347 | high part. */ |
| 348 | if ((gap & 0xf0000) != (dot & 0xf0000)) |
| 349 | { |
| 350 | if (! ((*link_info->callbacks->reloc_overflow) |
| 351 | (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr), |
| 352 | reloc->howto->name, reloc->addend, input_section->owner, |
| 353 | input_section, reloc->address))) |
| 354 | abort (); |
| 355 | } |
| 356 | |
| 357 | gap -= dot + 2; |
| 358 | bfd_put_16 (abfd, gap, data + dst_address); |
| 359 | dst_address += 2; |
| 360 | src_address += 2; |
| 361 | } |
| 362 | break; |
| 363 | default: |
| 364 | printf (_("ignoring reloc %s\n"), reloc->howto->name); |
| 365 | break; |
| 366 | |
| 367 | } |
| 368 | *src_ptr = src_address; |
| 369 | *dst_ptr = dst_address; |
| 370 | } |
| 371 | |
| 372 | #define coff_reloc16_extra_cases w65_reloc16_extra_cases |
| 373 | #define coff_reloc16_estimate w65_reloc16_estimate |
| 374 | |
| 375 | #include "coffcode.h" |
| 376 | |
| 377 | #undef coff_bfd_get_relocated_section_contents |
| 378 | #undef coff_bfd_relax_section |
| 379 | #define coff_bfd_get_relocated_section_contents \ |
| 380 | bfd_coff_reloc16_get_relocated_section_contents |
| 381 | #define coff_bfd_relax_section bfd_coff_reloc16_relax_section |
| 382 | |
| 383 | CREATE_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL, COFF_SWAP_TABLE) |