1/* BFD back-end for ns32k a.out-ish binaries. 2 Copyright (C) 1990-2017 Free Software Foundation, Inc. 3 Contributed by Ian Dall (idall@eleceng.adelaide.edu.au). 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 "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 (ns32k_aout_,OP) 31 32reloc_howto_type * MYNS (bfd_reloc_type_lookup) (bfd *, bfd_reloc_code_real_type); 33reloc_howto_type * MYNS (bfd_reloc_name_lookup) (bfd *, const char *); 34bfd_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 40void 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 79reloc_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 143static reloc_howto_type * 144MY (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 168static void 169MY (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 203static void MY_swap_std_reloc_in (bfd *, struct reloc_std_external *, arelent *, asymbol **, bfd_size_type); 204static void MY_swap_std_reloc_out (bfd *, arelent *, struct reloc_std_external *); 205 206#include "aoutx.h" 207 208reloc_howto_type * 209MY (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_arch_bits_per_address (abfd)) 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 251reloc_howto_type * 252MY (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 267static void 268MY_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 287static void 288MY_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 || bfd_is_abs_section (output_section) 307 || bfd_is_und_section (output_section)) 308 { 309 if (bfd_abs_section_ptr->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 336bfd_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} 365