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