| 1 | /* BFD back-end for ns32k a.out-ish binaries. |
| 2 | Copyright 1990, 1991, 1992, 1994, 1995, 1996, 1998, 1999, 2000, 2001, |
| 3 | 2002, 2003, 2005, 2007 Free Software Foundation, Inc. |
| 4 | Contributed by Ian Dall (idall@eleceng.adelaide.edu.au). |
| 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 3 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., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "bfd.h" |
| 24 | #include "aout/aout64.h" |
| 25 | #include "ns32k.h" |
| 26 | |
| 27 | /* Do not "beautify" the CONCAT* macro args. Traditional C will not |
| 28 | remove whitespace added here, and thus will fail to concatenate |
| 29 | the tokens. */ |
| 30 | #define MYNS(OP) CONCAT2 (ns32kaout_,OP) |
| 31 | |
| 32 | reloc_howto_type * MYNS (bfd_reloc_type_lookup) (bfd *, bfd_reloc_code_real_type); |
| 33 | reloc_howto_type * MYNS (bfd_reloc_name_lookup) (bfd *, const char *); |
| 34 | bfd_boolean MYNS (write_object_contents) (bfd *); |
| 35 | |
| 36 | /* Avoid multiple definitions from aoutx if supporting |
| 37 | standard a.out format(s) as well as this one. */ |
| 38 | #define NAME(x,y) CONCAT3 (ns32kaout,_32_,y) |
| 39 | |
| 40 | void bfd_ns32k_arch (void); |
| 41 | |
| 42 | #include "libaout.h" |
| 43 | |
| 44 | #define MY(OP) MYNS (OP) |
| 45 | |
| 46 | #define MY_swap_std_reloc_in MY (swap_std_reloc_in) |
| 47 | #define MY_swap_std_reloc_out MY (swap_std_reloc_out) |
| 48 | |
| 49 | /* The ns32k series is ah, unusual, when it comes to relocation. |
| 50 | There are three storage methods for relocatable objects. There |
| 51 | are displacements, immediate operands and ordinary twos complement |
| 52 | data. Of these, only the last fits into the standard relocation |
| 53 | scheme. Immediate operands are stored huffman encoded and |
| 54 | immediate operands are stored big endian (where as the natural byte |
| 55 | order is little endian for this architecture). |
| 56 | |
| 57 | Note that the ns32k displacement storage method is orthogonal to |
| 58 | whether the relocation is pc relative or not. The "displacement" |
| 59 | storage scheme is used for essentially all address constants. The |
| 60 | displacement can be relative to zero (absolute displacement), |
| 61 | relative to the pc (pc relative), the stack pointer, the frame |
| 62 | pointer, the static base register and general purpose register etc. |
| 63 | |
| 64 | For example: |
| 65 | |
| 66 | sym1: .long . # pc relative 2's complement |
| 67 | sym1: .long foo # 2's complement not pc relative |
| 68 | |
| 69 | self: movd @self, r0 # pc relative displacement |
| 70 | movd foo, r0 # non pc relative displacement |
| 71 | |
| 72 | self: movd self, r0 # pc relative immediate |
| 73 | movd foo, r0 # non pc relative immediate |
| 74 | |
| 75 | In addition, for historical reasons the encoding of the relocation types |
| 76 | in the a.out format relocation entries is such that even the relocation |
| 77 | methods which are standard are not encoded the standard way. */ |
| 78 | |
| 79 | reloc_howto_type MY (howto_table)[] = |
| 80 | { |
| 81 | /* ns32k immediate operands. */ |
| 82 | HOWTO (BFD_RELOC_NS32K_IMM_8, 0, 0, 8, FALSE, 0, complain_overflow_signed, |
| 83 | _bfd_ns32k_reloc_imm, "NS32K_IMM_8", |
| 84 | TRUE, 0x000000ff,0x000000ff, FALSE), |
| 85 | HOWTO (BFD_RELOC_NS32K_IMM_16, 0, 1, 16, FALSE, 0, complain_overflow_signed, |
| 86 | _bfd_ns32k_reloc_imm, "NS32K_IMM_16", |
| 87 | TRUE, 0x0000ffff,0x0000ffff, FALSE), |
| 88 | HOWTO (BFD_RELOC_NS32K_IMM_32, 0, 2, 32, FALSE, 0, complain_overflow_signed, |
| 89 | _bfd_ns32k_reloc_imm, "NS32K_IMM_32", |
| 90 | TRUE, 0xffffffff,0xffffffff, FALSE), |
| 91 | HOWTO (BFD_RELOC_NS32K_IMM_8_PCREL, 0, 0, 8, TRUE, 0, complain_overflow_signed, |
| 92 | _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_8", |
| 93 | TRUE, 0x000000ff, 0x000000ff, FALSE), |
| 94 | HOWTO (BFD_RELOC_NS32K_IMM_16_PCREL, 0, 1, 16, TRUE, 0, complain_overflow_signed, |
| 95 | _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_16", |
| 96 | TRUE, 0x0000ffff,0x0000ffff, FALSE), |
| 97 | HOWTO (BFD_RELOC_NS32K_IMM_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, |
| 98 | _bfd_ns32k_reloc_imm, "PCREL_NS32K_IMM_32", |
| 99 | TRUE, 0xffffffff,0xffffffff, FALSE), |
| 100 | |
| 101 | /* ns32k displacements. */ |
| 102 | HOWTO (BFD_RELOC_NS32K_DISP_8, 0, 0, 7, FALSE, 0, complain_overflow_signed, |
| 103 | _bfd_ns32k_reloc_disp, "NS32K_DISP_8", |
| 104 | TRUE, 0x000000ff,0x000000ff, FALSE), |
| 105 | HOWTO (BFD_RELOC_NS32K_DISP_16, 0, 1, 14, FALSE, 0, complain_overflow_signed, |
| 106 | _bfd_ns32k_reloc_disp, "NS32K_DISP_16", |
| 107 | TRUE, 0x0000ffff, 0x0000ffff, FALSE), |
| 108 | HOWTO (BFD_RELOC_NS32K_DISP_32, 0, 2, 30, FALSE, 0, complain_overflow_signed, |
| 109 | _bfd_ns32k_reloc_disp, "NS32K_DISP_32", |
| 110 | TRUE, 0xffffffff, 0xffffffff, FALSE), |
| 111 | HOWTO (BFD_RELOC_NS32K_DISP_8_PCREL, 0, 0, 7, TRUE, 0, complain_overflow_signed, |
| 112 | _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_8", |
| 113 | TRUE, 0x000000ff,0x000000ff, FALSE), |
| 114 | HOWTO (BFD_RELOC_NS32K_DISP_16_PCREL, 0, 1, 14, TRUE, 0, complain_overflow_signed, |
| 115 | _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_16", |
| 116 | TRUE, 0x0000ffff,0x0000ffff, FALSE), |
| 117 | HOWTO (BFD_RELOC_NS32K_DISP_32_PCREL, 0, 2, 30, TRUE, 0, complain_overflow_signed, |
| 118 | _bfd_ns32k_reloc_disp, "PCREL_NS32K_DISP_32", |
| 119 | TRUE, 0xffffffff,0xffffffff, FALSE), |
| 120 | |
| 121 | /* Normal 2's complement. */ |
| 122 | HOWTO (BFD_RELOC_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,0, |
| 123 | "8", TRUE, 0x000000ff,0x000000ff, FALSE), |
| 124 | HOWTO (BFD_RELOC_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,0, |
| 125 | "16", TRUE, 0x0000ffff,0x0000ffff, FALSE), |
| 126 | HOWTO (BFD_RELOC_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,0, |
| 127 | "32", TRUE, 0xffffffff,0xffffffff, FALSE), |
| 128 | HOWTO (BFD_RELOC_8_PCREL, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0, |
| 129 | "PCREL_8", TRUE, 0x000000ff,0x000000ff, FALSE), |
| 130 | HOWTO (BFD_RELOC_16_PCREL, 0, 1, 16, TRUE, 0, complain_overflow_signed, 0, |
| 131 | "PCREL_16", TRUE, 0x0000ffff,0x0000ffff, FALSE), |
| 132 | HOWTO (BFD_RELOC_32_PCREL, 0, 2, 32, TRUE, 0, complain_overflow_signed, 0, |
| 133 | "PCREL_32", TRUE, 0xffffffff,0xffffffff, FALSE), |
| 134 | }; |
| 135 | |
| 136 | #define CTOR_TABLE_RELOC_HOWTO(BFD) (MY (howto_table) + 14) |
| 137 | |
| 138 | #define RELOC_STD_BITS_NS32K_TYPE_BIG 0x06 |
| 139 | #define RELOC_STD_BITS_NS32K_TYPE_LITTLE 0x60 |
| 140 | #define RELOC_STD_BITS_NS32K_TYPE_SH_BIG 1 |
| 141 | #define RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE 5 |
| 142 | |
| 143 | static reloc_howto_type * |
| 144 | MY (reloc_howto) (bfd *abfd ATTRIBUTE_UNUSED, |
| 145 | struct reloc_std_external *rel, |
| 146 | int *r_index, |
| 147 | int *r_extern, |
| 148 | int *r_pcrel) |
| 149 | { |
| 150 | unsigned int r_length; |
| 151 | int r_ns32k_type; |
| 152 | |
| 153 | *r_index = ((rel->r_index[2] << 16) |
| 154 | | (rel->r_index[1] << 8) |
| 155 | | rel->r_index[0] ); |
| 156 | *r_extern = (0 != (rel->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE)); |
| 157 | *r_pcrel = (0 != (rel->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE)); |
| 158 | r_length = ((rel->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE) |
| 159 | >> RELOC_STD_BITS_LENGTH_SH_LITTLE); |
| 160 | r_ns32k_type = ((rel->r_type[0] & RELOC_STD_BITS_NS32K_TYPE_LITTLE) |
| 161 | >> RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE); |
| 162 | return (MY (howto_table) + r_length + 3 * (*r_pcrel) + 6 * r_ns32k_type); |
| 163 | } |
| 164 | |
| 165 | #define MY_reloc_howto(BFD, REL, IN, EX, PC) \ |
| 166 | MY (reloc_howto) (BFD, REL, &IN, &EX, &PC) |
| 167 | |
| 168 | static void |
| 169 | MY (put_reloc) (bfd *abfd, |
| 170 | int r_extern, |
| 171 | int r_index, |
| 172 | bfd_vma value, |
| 173 | reloc_howto_type *howto, |
| 174 | struct reloc_std_external *reloc) |
| 175 | { |
| 176 | unsigned int r_length; |
| 177 | int r_pcrel; |
| 178 | int r_ns32k_type; |
| 179 | |
| 180 | PUT_WORD (abfd, value, reloc->r_address); |
| 181 | r_length = howto->size ; /* Size as a power of two. */ |
| 182 | r_pcrel = (int) howto->pc_relative; /* Relative to PC? */ |
| 183 | r_ns32k_type = (howto - MY (howto_table) )/6; |
| 184 | |
| 185 | reloc->r_index[2] = r_index >> 16; |
| 186 | reloc->r_index[1] = r_index >> 8; |
| 187 | reloc->r_index[0] = r_index; |
| 188 | reloc->r_type[0] = |
| 189 | (r_extern? RELOC_STD_BITS_EXTERN_LITTLE: 0) |
| 190 | | (r_pcrel? RELOC_STD_BITS_PCREL_LITTLE: 0) |
| 191 | | (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE) |
| 192 | | (r_ns32k_type << RELOC_STD_BITS_NS32K_TYPE_SH_LITTLE); |
| 193 | } |
| 194 | |
| 195 | #define MY_put_reloc(BFD, EXT, IDX, VAL, HOWTO, RELOC) \ |
| 196 | MY (put_reloc) (BFD, EXT, IDX, VAL, HOWTO, RELOC) |
| 197 | |
| 198 | #define STAT_FOR_EXEC |
| 199 | |
| 200 | #define MY_final_link_relocate _bfd_ns32k_final_link_relocate |
| 201 | #define MY_relocate_contents _bfd_ns32k_relocate_contents |
| 202 | |
| 203 | static void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type); |
| 204 | static void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *); |
| 205 | |
| 206 | #include "aoutx.h" |
| 207 | |
| 208 | reloc_howto_type * |
| 209 | MY (bfd_reloc_type_lookup) (bfd *abfd, bfd_reloc_code_real_type code) |
| 210 | { |
| 211 | #define ENTRY(i,j) case i: return &MY (howto_table)[j] |
| 212 | |
| 213 | int ext = obj_reloc_entry_size (abfd) == RELOC_EXT_SIZE; |
| 214 | |
| 215 | BFD_ASSERT (ext == 0); |
| 216 | if (code == BFD_RELOC_CTOR) |
| 217 | switch (bfd_get_arch_info (abfd)->bits_per_address) |
| 218 | { |
| 219 | case 32: |
| 220 | code = BFD_RELOC_32; |
| 221 | break; |
| 222 | default: |
| 223 | break; |
| 224 | } |
| 225 | switch (code) |
| 226 | { |
| 227 | ENTRY (BFD_RELOC_NS32K_IMM_8, 0); |
| 228 | ENTRY (BFD_RELOC_NS32K_IMM_16, 1); |
| 229 | ENTRY (BFD_RELOC_NS32K_IMM_32, 2); |
| 230 | ENTRY (BFD_RELOC_NS32K_IMM_8_PCREL, 3); |
| 231 | ENTRY (BFD_RELOC_NS32K_IMM_16_PCREL, 4); |
| 232 | ENTRY (BFD_RELOC_NS32K_IMM_32_PCREL, 5); |
| 233 | ENTRY (BFD_RELOC_NS32K_DISP_8, 6); |
| 234 | ENTRY (BFD_RELOC_NS32K_DISP_16, 7); |
| 235 | ENTRY (BFD_RELOC_NS32K_DISP_32, 8); |
| 236 | ENTRY (BFD_RELOC_NS32K_DISP_8_PCREL, 9); |
| 237 | ENTRY (BFD_RELOC_NS32K_DISP_16_PCREL, 10); |
| 238 | ENTRY (BFD_RELOC_NS32K_DISP_32_PCREL, 11); |
| 239 | ENTRY (BFD_RELOC_8, 12); |
| 240 | ENTRY (BFD_RELOC_16, 13); |
| 241 | ENTRY (BFD_RELOC_32, 14); |
| 242 | ENTRY (BFD_RELOC_8_PCREL, 15); |
| 243 | ENTRY (BFD_RELOC_16_PCREL, 16); |
| 244 | ENTRY (BFD_RELOC_32_PCREL, 17); |
| 245 | default: |
| 246 | return NULL; |
| 247 | } |
| 248 | #undef ENTRY |
| 249 | } |
| 250 | |
| 251 | reloc_howto_type * |
| 252 | MY (bfd_reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED, |
| 253 | const char *r_name) |
| 254 | { |
| 255 | unsigned int i; |
| 256 | |
| 257 | for (i = 0; |
| 258 | i < sizeof (MY (howto_table)) / sizeof (MY (howto_table)[0]); |
| 259 | i++) |
| 260 | if (MY (howto_table)[i].name != NULL |
| 261 | && strcasecmp (MY (howto_table)[i].name, r_name) == 0) |
| 262 | return &MY (howto_table)[i]; |
| 263 | |
| 264 | return NULL; |
| 265 | } |
| 266 | |
| 267 | static void |
| 268 | MY_swap_std_reloc_in (bfd *abfd, |
| 269 | struct reloc_std_external *bytes, |
| 270 | arelent *cache_ptr, |
| 271 | asymbol **symbols, |
| 272 | bfd_size_type symcount ATTRIBUTE_UNUSED) |
| 273 | { |
| 274 | int r_index; |
| 275 | int r_extern; |
| 276 | int r_pcrel; |
| 277 | struct aoutdata *su = &(abfd->tdata.aout_data->a); |
| 278 | |
| 279 | cache_ptr->address = H_GET_32 (abfd, bytes->r_address); |
| 280 | |
| 281 | /* Now the fun stuff. */ |
| 282 | cache_ptr->howto = MY_reloc_howto (abfd, bytes, r_index, r_extern, r_pcrel); |
| 283 | |
| 284 | MOVE_ADDRESS (0); |
| 285 | } |
| 286 | |
| 287 | static void |
| 288 | MY_swap_std_reloc_out (bfd *abfd, |
| 289 | arelent *g, |
| 290 | struct reloc_std_external *natptr) |
| 291 | { |
| 292 | int r_index; |
| 293 | asymbol *sym = *(g->sym_ptr_ptr); |
| 294 | int r_extern; |
| 295 | asection *output_section = sym->section->output_section; |
| 296 | |
| 297 | /* Name was clobbered by aout_write_syms to be symbol index. */ |
| 298 | |
| 299 | /* If this relocation is relative to a symbol then set the |
| 300 | r_index to the symbols index, and the r_extern bit. |
| 301 | |
| 302 | Absolute symbols can come in in two ways, either as an offset |
| 303 | from the abs section, or as a symbol which has an abs value. |
| 304 | Check for that here. */ |
| 305 | if (bfd_is_com_section (output_section) |
| 306 | || output_section == &bfd_abs_section |
| 307 | || output_section == &bfd_und_section) |
| 308 | { |
| 309 | if (bfd_abs_section.symbol == sym) |
| 310 | { |
| 311 | /* Whoops, looked like an abs symbol, but is really an offset |
| 312 | from the abs section. */ |
| 313 | r_index = 0; |
| 314 | r_extern = 0; |
| 315 | } |
| 316 | else |
| 317 | { |
| 318 | /* Fill in symbol. */ |
| 319 | r_extern = 1; |
| 320 | #undef KEEPIT |
| 321 | #define KEEPIT udata.i |
| 322 | r_index = (*(g->sym_ptr_ptr))->KEEPIT; |
| 323 | #undef KEEPIT |
| 324 | } |
| 325 | } |
| 326 | else |
| 327 | { |
| 328 | /* Just an ordinary section. */ |
| 329 | r_extern = 0; |
| 330 | r_index = output_section->target_index; |
| 331 | } |
| 332 | |
| 333 | MY_put_reloc (abfd, r_extern, r_index, g->address, g->howto, natptr); |
| 334 | } |
| 335 | |
| 336 | bfd_reloc_status_type |
| 337 | _bfd_ns32k_relocate_contents (reloc_howto_type *howto, |
| 338 | bfd *input_bfd, |
| 339 | bfd_vma relocation, |
| 340 | bfd_byte *location) |
| 341 | { |
| 342 | int r_ns32k_type = (howto - MY (howto_table)) / 6; |
| 343 | bfd_vma (*get_data) (bfd_byte *, int); |
| 344 | void (*put_data) (bfd_vma, bfd_byte *, int); |
| 345 | |
| 346 | switch (r_ns32k_type) |
| 347 | { |
| 348 | case 0: |
| 349 | get_data = _bfd_ns32k_get_immediate; |
| 350 | put_data = _bfd_ns32k_put_immediate; |
| 351 | break; |
| 352 | case 1: |
| 353 | get_data = _bfd_ns32k_get_displacement; |
| 354 | put_data = _bfd_ns32k_put_displacement; |
| 355 | break; |
| 356 | case 2: |
| 357 | return _bfd_relocate_contents (howto, input_bfd, relocation, |
| 358 | location); |
| 359 | default: |
| 360 | return bfd_reloc_notsupported; |
| 361 | } |
| 362 | return _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation, |
| 363 | location, get_data, put_data); |
| 364 | } |