| 1 | /* Support for 32-bit Alpha NLM (NetWare Loadable Module) |
| 2 | Copyright (C) 1993-2015 Free Software Foundation, Inc. |
| 3 | Written by Ian Lance Taylor, Cygnus Support. |
| 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 | |
| 23 | /* This file describes the 32 bit Alpha NLM format. You might think |
| 24 | that an Alpha chip would use a 64 bit format, but, for some reason, |
| 25 | it doesn't. */ |
| 26 | |
| 27 | #include "sysdep.h" |
| 28 | #include "bfd.h" |
| 29 | #include "libbfd.h" |
| 30 | |
| 31 | #define ARCH_SIZE 32 |
| 32 | |
| 33 | #include "nlm/alpha-ext.h" |
| 34 | #define Nlm_External_Fixed_Header Nlm32_alpha_External_Fixed_Header |
| 35 | |
| 36 | #include "libnlm.h" |
| 37 | \f |
| 38 | /* Alpha NLM's have a prefix header before the standard NLM. This |
| 39 | function reads it in, verifies the version, and seeks the bfd to |
| 40 | the location before the regular NLM header. */ |
| 41 | |
| 42 | static bfd_boolean |
| 43 | nlm_alpha_backend_object_p (bfd *abfd) |
| 44 | { |
| 45 | struct nlm32_alpha_external_prefix_header s; |
| 46 | file_ptr size; |
| 47 | |
| 48 | if (bfd_bread (&s, (bfd_size_type) sizeof s, abfd) != sizeof s) |
| 49 | return FALSE; |
| 50 | |
| 51 | if (H_GET_32 (abfd, s.magic) != NLM32_ALPHA_MAGIC) |
| 52 | return FALSE; |
| 53 | |
| 54 | /* FIXME: Should we check the format number? */ |
| 55 | |
| 56 | /* Skip to the end of the header. */ |
| 57 | size = H_GET_32 (abfd, s.size); |
| 58 | if (bfd_seek (abfd, size, SEEK_SET) != 0) |
| 59 | return FALSE; |
| 60 | |
| 61 | return TRUE; |
| 62 | } |
| 63 | |
| 64 | /* Write out the prefix. */ |
| 65 | |
| 66 | static bfd_boolean |
| 67 | nlm_alpha_write_prefix (bfd *abfd) |
| 68 | { |
| 69 | struct nlm32_alpha_external_prefix_header s; |
| 70 | |
| 71 | memset (&s, 0, sizeof s); |
| 72 | H_PUT_32 (abfd, NLM32_ALPHA_MAGIC, s.magic); |
| 73 | H_PUT_32 (abfd, 2, s.format); |
| 74 | H_PUT_32 (abfd, sizeof s, s.size); |
| 75 | if (bfd_bwrite (&s, (bfd_size_type) sizeof s, abfd) != sizeof s) |
| 76 | return FALSE; |
| 77 | return TRUE; |
| 78 | } |
| 79 | \f |
| 80 | #define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1) |
| 81 | |
| 82 | /* How to process the various reloc types. */ |
| 83 | |
| 84 | static reloc_howto_type nlm32_alpha_howto_table[] = |
| 85 | { |
| 86 | /* Reloc type 0 is ignored by itself. However, it appears after a |
| 87 | GPDISP reloc to identify the location where the low order 16 bits |
| 88 | of the gp register are loaded. */ |
| 89 | HOWTO (ALPHA_R_IGNORE, /* Type. */ |
| 90 | 0, /* Rightshift. */ |
| 91 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 92 | 8, /* Bitsize. */ |
| 93 | FALSE, /* PC_relative. */ |
| 94 | 0, /* Bitpos. */ |
| 95 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 96 | 0, /* Special_function. */ |
| 97 | "IGNORE", /* Name. */ |
| 98 | FALSE, /* Partial_inplace. */ |
| 99 | 0, /* Source mask. */ |
| 100 | 0, /* Dest mask. */ |
| 101 | FALSE), /* PCrel_offset. */ |
| 102 | |
| 103 | /* A 32 bit reference to a symbol. */ |
| 104 | HOWTO (ALPHA_R_REFLONG, /* Type. */ |
| 105 | 0, /* Rightshift. */ |
| 106 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 107 | 32, /* Bitsize. */ |
| 108 | FALSE, /* PC_relative. */ |
| 109 | 0, /* Bitpos. */ |
| 110 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 111 | 0, /* Special_function. */ |
| 112 | "REFLONG", /* Name. */ |
| 113 | TRUE, /* Partial_inplace. */ |
| 114 | 0xffffffff, /* Source mask. */ |
| 115 | 0xffffffff, /* Dest mask. */ |
| 116 | FALSE), /* PCrel_offset. */ |
| 117 | |
| 118 | /* A 64 bit reference to a symbol. */ |
| 119 | HOWTO (ALPHA_R_REFQUAD, /* Type. */ |
| 120 | 0, /* Rightshift. */ |
| 121 | 4, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 122 | 64, /* Bitsize. */ |
| 123 | FALSE, /* PC_relative. */ |
| 124 | 0, /* Bitpos. */ |
| 125 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 126 | 0, /* Special_function. */ |
| 127 | "REFQUAD", /* Name. */ |
| 128 | TRUE, /* Partial_inplace. */ |
| 129 | ONES (64), /* Source mask. */ |
| 130 | ONES (64), /* Dest mask. */ |
| 131 | FALSE), /* PCrel_offset. */ |
| 132 | |
| 133 | /* A 32 bit GP relative offset. This is just like REFLONG except |
| 134 | that when the value is used the value of the gp register will be |
| 135 | added in. */ |
| 136 | HOWTO (ALPHA_R_GPREL32, /* Type. */ |
| 137 | 0, /* Rightshift. */ |
| 138 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 139 | 32, /* Bitsize. */ |
| 140 | FALSE, /* PC_relative. */ |
| 141 | 0, /* Bitpos. */ |
| 142 | complain_overflow_bitfield, /* Complain_on_overflow. */ |
| 143 | 0, /* Special_function. */ |
| 144 | "GPREL32", /* Name. */ |
| 145 | TRUE, /* Partial_inplace. */ |
| 146 | 0xffffffff, /* Source mask. */ |
| 147 | 0xffffffff, /* Dest mask. */ |
| 148 | FALSE), /* PCrel_offset. */ |
| 149 | |
| 150 | /* Used for an instruction that refers to memory off the GP |
| 151 | register. The offset is 16 bits of the 32 bit instruction. This |
| 152 | reloc always seems to be against the .lita section. */ |
| 153 | HOWTO (ALPHA_R_LITERAL, /* Type. */ |
| 154 | 0, /* Rightshift. */ |
| 155 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 156 | 16, /* Bitsize. */ |
| 157 | FALSE, /* PC_relative. */ |
| 158 | 0, /* Bitpos. */ |
| 159 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 160 | 0, /* Special_function. */ |
| 161 | "LITERAL", /* Name. */ |
| 162 | TRUE, /* Partial_inplace. */ |
| 163 | 0xffff, /* Source mask. */ |
| 164 | 0xffff, /* Dest mask. */ |
| 165 | FALSE), /* PCrel_offset. */ |
| 166 | |
| 167 | /* This reloc only appears immediately following a LITERAL reloc. |
| 168 | It identifies a use of the literal. It seems that the linker can |
| 169 | use this to eliminate a portion of the .lita section. The symbol |
| 170 | index is special: 1 means the literal address is in the base |
| 171 | register of a memory format instruction; 2 means the literal |
| 172 | address is in the byte offset register of a byte-manipulation |
| 173 | instruction; 3 means the literal address is in the target |
| 174 | register of a jsr instruction. This does not actually do any |
| 175 | relocation. */ |
| 176 | HOWTO (ALPHA_R_LITUSE, /* Type. */ |
| 177 | 0, /* Rightshift. */ |
| 178 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 179 | 32, /* Bitsize. */ |
| 180 | FALSE, /* PC_relative. */ |
| 181 | 0, /* Bitpos. */ |
| 182 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 183 | 0, /* Special_function. */ |
| 184 | "LITUSE", /* Name. */ |
| 185 | FALSE, /* Partial_inplace. */ |
| 186 | 0, /* Source mask. */ |
| 187 | 0, /* Dest mask. */ |
| 188 | FALSE), /* PCrel_offset. */ |
| 189 | |
| 190 | /* Load the gp register. This is always used for a ldah instruction |
| 191 | which loads the upper 16 bits of the gp register. The next reloc |
| 192 | will be an IGNORE reloc which identifies the location of the lda |
| 193 | instruction which loads the lower 16 bits. The symbol index of |
| 194 | the GPDISP instruction appears to actually be the number of bytes |
| 195 | between the ldah and lda instructions. This gives two different |
| 196 | ways to determine where the lda instruction is; I don't know why |
| 197 | both are used. The value to use for the relocation is the |
| 198 | difference between the GP value and the current location; the |
| 199 | load will always be done against a register holding the current |
| 200 | address. */ |
| 201 | HOWTO (ALPHA_R_GPDISP, /* Type. */ |
| 202 | 16, /* Rightshift. */ |
| 203 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 204 | 16, /* Bitsize. */ |
| 205 | TRUE, /* PC_relative. */ |
| 206 | 0, /* Bitpos. */ |
| 207 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 208 | 0, /* Special_function. */ |
| 209 | "GPDISP", /* Name. */ |
| 210 | TRUE, /* Partial_inplace. */ |
| 211 | 0xffff, /* Source mask. */ |
| 212 | 0xffff, /* Dest mask. */ |
| 213 | TRUE), /* PCrel_offset. */ |
| 214 | |
| 215 | /* A 21 bit branch. The native assembler generates these for |
| 216 | branches within the text segment, and also fills in the PC |
| 217 | relative offset in the instruction. It seems to me that this |
| 218 | reloc, unlike the others, is not partial_inplace. */ |
| 219 | HOWTO (ALPHA_R_BRADDR, /* Type. */ |
| 220 | 2, /* Rightshift. */ |
| 221 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 222 | 21, /* Bitsize. */ |
| 223 | TRUE, /* PC_relative. */ |
| 224 | 0, /* Bitpos. */ |
| 225 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 226 | 0, /* Special_function. */ |
| 227 | "BRADDR", /* Name. */ |
| 228 | FALSE, /* Partial_inplace. */ |
| 229 | 0, /* Source mask. */ |
| 230 | 0x1fffff, /* Dest mask. */ |
| 231 | FALSE), /* PCrel_offset. */ |
| 232 | |
| 233 | /* A hint for a jump to a register. */ |
| 234 | HOWTO (ALPHA_R_HINT, /* Type. */ |
| 235 | 2, /* Rightshift. */ |
| 236 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 237 | 14, /* Bitsize. */ |
| 238 | FALSE, /* PC_relative. */ |
| 239 | 0, /* Bitpos. */ |
| 240 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 241 | 0, /* Special_function. */ |
| 242 | "HINT", /* Name. */ |
| 243 | TRUE, /* Partial_inplace. */ |
| 244 | 0x3fff, /* Source mask. */ |
| 245 | 0x3fff, /* Dest mask. */ |
| 246 | FALSE), /* PCrel_offset. */ |
| 247 | |
| 248 | /* 16 bit PC relative offset. */ |
| 249 | HOWTO (ALPHA_R_SREL16, /* Type. */ |
| 250 | 0, /* Rightshift. */ |
| 251 | 1, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 252 | 16, /* Bitsize. */ |
| 253 | TRUE, /* PC_relative. */ |
| 254 | 0, /* Bitpos. */ |
| 255 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 256 | 0, /* Special_function. */ |
| 257 | "SREL16", /* Name. */ |
| 258 | TRUE, /* Partial_inplace. */ |
| 259 | 0xffff, /* Source mask. */ |
| 260 | 0xffff, /* Dest mask. */ |
| 261 | FALSE), /* PCrel_offset. */ |
| 262 | |
| 263 | /* 32 bit PC relative offset. */ |
| 264 | HOWTO (ALPHA_R_SREL32, /* Type. */ |
| 265 | 0, /* Rightshift. */ |
| 266 | 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 267 | 32, /* Bitsize. */ |
| 268 | TRUE, /* PC_relative. */ |
| 269 | 0, /* Bitpos. */ |
| 270 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 271 | 0, /* Special_function. */ |
| 272 | "SREL32", /* Name. */ |
| 273 | TRUE, /* Partial_inplace. */ |
| 274 | 0xffffffff, /* Source mask. */ |
| 275 | 0xffffffff, /* Dest mask. */ |
| 276 | FALSE), /* PCrel_offset. */ |
| 277 | |
| 278 | /* A 64 bit PC relative offset. */ |
| 279 | HOWTO (ALPHA_R_SREL64, /* Type. */ |
| 280 | 0, /* Rightshift. */ |
| 281 | 4, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 282 | 64, /* Bitsize. */ |
| 283 | TRUE, /* PC_relative. */ |
| 284 | 0, /* Bitpos. */ |
| 285 | complain_overflow_signed, /* Complain_on_overflow. */ |
| 286 | 0, /* Special_function. */ |
| 287 | "SREL64", /* Name. */ |
| 288 | TRUE, /* Partial_inplace. */ |
| 289 | ONES (64), /* Source mask. */ |
| 290 | ONES (64), /* Dest mask. */ |
| 291 | FALSE), /* PCrel_offset. */ |
| 292 | |
| 293 | /* Push a value on the reloc evaluation stack. */ |
| 294 | HOWTO (ALPHA_R_OP_PUSH, /* Type. */ |
| 295 | 0, /* Rightshift. */ |
| 296 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 297 | 0, /* Bitsize. */ |
| 298 | FALSE, /* PC_relative. */ |
| 299 | 0, /* Bitpos. */ |
| 300 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 301 | 0, /* Special_function. */ |
| 302 | "OP_PUSH", /* Name. */ |
| 303 | FALSE, /* Partial_inplace. */ |
| 304 | 0, /* Source mask. */ |
| 305 | 0, /* Dest mask. */ |
| 306 | FALSE), /* PCrel_offset. */ |
| 307 | |
| 308 | /* Store the value from the stack at the given address. Store it in |
| 309 | a bitfield of size r_size starting at bit position r_offset. */ |
| 310 | HOWTO (ALPHA_R_OP_STORE, /* Type. */ |
| 311 | 0, /* Rightshift. */ |
| 312 | 4, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 313 | 64, /* Bitsize. */ |
| 314 | FALSE, /* PC_relative. */ |
| 315 | 0, /* Bitpos. */ |
| 316 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 317 | 0, /* Special_function. */ |
| 318 | "OP_STORE", /* Name. */ |
| 319 | FALSE, /* Partial_inplace. */ |
| 320 | 0, /* Source mask. */ |
| 321 | ONES (64), /* Dest mask. */ |
| 322 | FALSE), /* PCrel_offset. */ |
| 323 | |
| 324 | /* Subtract the reloc address from the value on the top of the |
| 325 | relocation stack. */ |
| 326 | HOWTO (ALPHA_R_OP_PSUB, /* Type. */ |
| 327 | 0, /* Rightshift. */ |
| 328 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 329 | 0, /* Bitsize. */ |
| 330 | FALSE, /* PC_relative. */ |
| 331 | 0, /* Bitpos. */ |
| 332 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 333 | 0, /* Special_function. */ |
| 334 | "OP_PSUB", /* Name. */ |
| 335 | FALSE, /* Partial_inplace. */ |
| 336 | 0, /* Source mask. */ |
| 337 | 0, /* Dest mask. */ |
| 338 | FALSE), /* PCrel_offset. */ |
| 339 | |
| 340 | /* Shift the value on the top of the relocation stack right by the |
| 341 | given value. */ |
| 342 | HOWTO (ALPHA_R_OP_PRSHIFT, /* Type. */ |
| 343 | 0, /* Rightshift. */ |
| 344 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 345 | 0, /* Bitsize. */ |
| 346 | FALSE, /* PC_relative. */ |
| 347 | 0, /* Bitpos. */ |
| 348 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 349 | 0, /* Special_function. */ |
| 350 | "OP_PRSHIFT", /* Name. */ |
| 351 | FALSE, /* Partial_inplace. */ |
| 352 | 0, /* Source mask. */ |
| 353 | 0, /* Dest mask. */ |
| 354 | FALSE), /* PCrel_offset. */ |
| 355 | |
| 356 | /* Adjust the GP value for a new range in the object file. */ |
| 357 | HOWTO (ALPHA_R_GPVALUE, /* Type. */ |
| 358 | 0, /* Rightshift. */ |
| 359 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 360 | 0, /* Bitsize. */ |
| 361 | FALSE, /* PC_relative. */ |
| 362 | 0, /* Bitpos. */ |
| 363 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 364 | 0, /* Special_function. */ |
| 365 | "GPVALUE", /* Name. */ |
| 366 | FALSE, /* Partial_inplace. */ |
| 367 | 0, /* Source mask. */ |
| 368 | 0, /* Dest mask. */ |
| 369 | FALSE) /* PCrel_offset. */ |
| 370 | }; |
| 371 | |
| 372 | static reloc_howto_type nlm32_alpha_nw_howto = |
| 373 | HOWTO (ALPHA_R_NW_RELOC, /* Type. */ |
| 374 | 0, /* Rightshift. */ |
| 375 | 0, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 376 | 0, /* Bitsize. */ |
| 377 | FALSE, /* PC_relative. */ |
| 378 | 0, /* Bitpos. */ |
| 379 | complain_overflow_dont, /* Complain_on_overflow. */ |
| 380 | 0, /* Special_function. */ |
| 381 | "NW_RELOC", /* Name. */ |
| 382 | FALSE, /* Partial_inplace. */ |
| 383 | 0, /* Source mask. */ |
| 384 | 0, /* Dest mask. */ |
| 385 | FALSE); /* PCrel_offset. */ |
| 386 | |
| 387 | /* Read an Alpha NLM reloc. This routine keeps some static data which |
| 388 | it uses when handling local relocs. This only works correctly |
| 389 | because all the local relocs are read at once. */ |
| 390 | |
| 391 | static bfd_boolean |
| 392 | nlm_alpha_read_reloc (bfd *abfd, |
| 393 | nlmNAME (symbol_type) *sym, |
| 394 | asection **secp, |
| 395 | arelent *rel) |
| 396 | { |
| 397 | static bfd_vma gp_value; |
| 398 | static bfd_vma lita_address; |
| 399 | struct nlm32_alpha_external_reloc ext; |
| 400 | bfd_vma r_vaddr; |
| 401 | long r_symndx; |
| 402 | int r_type, r_extern, r_offset, r_size; |
| 403 | asection *code_sec, *data_sec; |
| 404 | |
| 405 | /* Read the reloc from the file. */ |
| 406 | if (bfd_bread (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext) |
| 407 | return FALSE; |
| 408 | |
| 409 | /* Swap in the reloc information. */ |
| 410 | r_vaddr = H_GET_64 (abfd, ext.r_vaddr); |
| 411 | r_symndx = H_GET_32 (abfd, ext.r_symndx); |
| 412 | |
| 413 | BFD_ASSERT (bfd_little_endian (abfd)); |
| 414 | |
| 415 | r_type = ((ext.r_bits[0] & RELOC_BITS0_TYPE_LITTLE) |
| 416 | >> RELOC_BITS0_TYPE_SH_LITTLE); |
| 417 | r_extern = (ext.r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0; |
| 418 | r_offset = ((ext.r_bits[1] & RELOC_BITS1_OFFSET_LITTLE) |
| 419 | >> RELOC_BITS1_OFFSET_SH_LITTLE); |
| 420 | /* Ignore the reserved bits. */ |
| 421 | r_size = ((ext.r_bits[3] & RELOC_BITS3_SIZE_LITTLE) |
| 422 | >> RELOC_BITS3_SIZE_SH_LITTLE); |
| 423 | |
| 424 | /* Fill in the BFD arelent structure. */ |
| 425 | code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME); |
| 426 | data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME); |
| 427 | if (r_extern) |
| 428 | { |
| 429 | /* External relocations are only used for imports. */ |
| 430 | BFD_ASSERT (sym != NULL); |
| 431 | /* We don't need to set sym_ptr_ptr for this case. It is set in |
| 432 | nlm_canonicalize_reloc. */ |
| 433 | rel->sym_ptr_ptr = NULL; |
| 434 | rel->addend = 0; |
| 435 | } |
| 436 | else |
| 437 | { |
| 438 | /* Internal relocations are only used for local relocation |
| 439 | fixups. If they are not NW_RELOC or GPDISP or IGNORE, they |
| 440 | must be against .text or .data. */ |
| 441 | BFD_ASSERT (r_type == ALPHA_R_NW_RELOC || sym == NULL); |
| 442 | if (r_type == ALPHA_R_NW_RELOC |
| 443 | || r_type == ALPHA_R_GPDISP |
| 444 | || r_type == ALPHA_R_IGNORE) |
| 445 | { |
| 446 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 447 | rel->addend = 0; |
| 448 | } |
| 449 | else if (r_symndx == ALPHA_RELOC_SECTION_TEXT) |
| 450 | { |
| 451 | rel->sym_ptr_ptr = code_sec->symbol_ptr_ptr; |
| 452 | BFD_ASSERT (bfd_get_section_vma (abfd, code_sec) == 0); |
| 453 | rel->addend = 0; |
| 454 | } |
| 455 | else if (r_symndx == ALPHA_RELOC_SECTION_DATA) |
| 456 | { |
| 457 | rel->sym_ptr_ptr = data_sec->symbol_ptr_ptr; |
| 458 | rel->addend = - bfd_get_section_vma (abfd, data_sec); |
| 459 | } |
| 460 | else |
| 461 | { |
| 462 | BFD_ASSERT (0); |
| 463 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 464 | rel->addend = 0; |
| 465 | } |
| 466 | } |
| 467 | |
| 468 | /* We use the address to determine whether the reloc is in the .text |
| 469 | or .data section. R_NW_RELOC relocs don't really have a section, |
| 470 | so we put them in .text. */ |
| 471 | if (r_type == ALPHA_R_NW_RELOC |
| 472 | || r_vaddr < code_sec->size) |
| 473 | { |
| 474 | *secp = code_sec; |
| 475 | rel->address = r_vaddr; |
| 476 | } |
| 477 | else |
| 478 | { |
| 479 | *secp = data_sec; |
| 480 | rel->address = r_vaddr - code_sec->size; |
| 481 | } |
| 482 | |
| 483 | /* We must adjust the addend based on the type. */ |
| 484 | BFD_ASSERT ((r_type >= 0 && r_type <= ALPHA_R_GPVALUE) |
| 485 | || r_type == ALPHA_R_NW_RELOC); |
| 486 | |
| 487 | switch (r_type) |
| 488 | { |
| 489 | case ALPHA_R_BRADDR: |
| 490 | case ALPHA_R_SREL16: |
| 491 | case ALPHA_R_SREL32: |
| 492 | case ALPHA_R_SREL64: |
| 493 | /* The PC relative relocs do not seem to use the section VMA as |
| 494 | a negative addend. */ |
| 495 | rel->addend = 0; |
| 496 | break; |
| 497 | |
| 498 | case ALPHA_R_GPREL32: |
| 499 | /* Copy the gp value for this object file into the addend, to |
| 500 | ensure that we are not confused by the linker. */ |
| 501 | if (! r_extern) |
| 502 | rel->addend += gp_value; |
| 503 | break; |
| 504 | |
| 505 | case ALPHA_R_LITERAL: |
| 506 | BFD_ASSERT (! r_extern); |
| 507 | rel->addend += lita_address; |
| 508 | break; |
| 509 | |
| 510 | case ALPHA_R_LITUSE: |
| 511 | case ALPHA_R_GPDISP: |
| 512 | /* The LITUSE and GPDISP relocs do not use a symbol, or an |
| 513 | addend, but they do use a special code. Put this code in the |
| 514 | addend field. */ |
| 515 | rel->addend = r_symndx; |
| 516 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 517 | break; |
| 518 | |
| 519 | case ALPHA_R_OP_STORE: |
| 520 | /* The STORE reloc needs the size and offset fields. We store |
| 521 | them in the addend. */ |
| 522 | BFD_ASSERT (r_offset < 256 && r_size < 256); |
| 523 | rel->addend = (r_offset << 8) + r_size; |
| 524 | break; |
| 525 | |
| 526 | case ALPHA_R_OP_PUSH: |
| 527 | case ALPHA_R_OP_PSUB: |
| 528 | case ALPHA_R_OP_PRSHIFT: |
| 529 | /* The PUSH, PSUB and PRSHIFT relocs do not actually use an |
| 530 | address. I believe that the address supplied is really an |
| 531 | addend. */ |
| 532 | rel->addend = r_vaddr; |
| 533 | break; |
| 534 | |
| 535 | case ALPHA_R_GPVALUE: |
| 536 | /* Record the new gp value. */ |
| 537 | gp_value += r_symndx; |
| 538 | rel->addend = gp_value; |
| 539 | break; |
| 540 | |
| 541 | case ALPHA_R_IGNORE: |
| 542 | /* If the type is ALPHA_R_IGNORE, make sure this is a reference |
| 543 | to the absolute section so that the reloc is ignored. For |
| 544 | some reason the address of this reloc type is not adjusted by |
| 545 | the section vma. We record the gp value for this object file |
| 546 | here, for convenience when doing the GPDISP relocation. */ |
| 547 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 548 | rel->address = r_vaddr; |
| 549 | rel->addend = gp_value; |
| 550 | break; |
| 551 | |
| 552 | case ALPHA_R_NW_RELOC: |
| 553 | /* If this is SETGP, we set the addend to 0. Otherwise we set |
| 554 | the addend to the size of the .lita section (this is |
| 555 | r_symndx) plus 1. We have already set the address of the |
| 556 | reloc to r_vaddr. */ |
| 557 | if (r_size == ALPHA_R_NW_RELOC_SETGP) |
| 558 | { |
| 559 | gp_value = r_vaddr; |
| 560 | rel->addend = 0; |
| 561 | } |
| 562 | else if (r_size == ALPHA_R_NW_RELOC_LITA) |
| 563 | { |
| 564 | lita_address = r_vaddr; |
| 565 | rel->addend = r_symndx + 1; |
| 566 | } |
| 567 | else |
| 568 | BFD_ASSERT (0); |
| 569 | rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 570 | break; |
| 571 | |
| 572 | default: |
| 573 | break; |
| 574 | } |
| 575 | |
| 576 | if (r_type == ALPHA_R_NW_RELOC) |
| 577 | rel->howto = &nlm32_alpha_nw_howto; |
| 578 | else |
| 579 | rel->howto = &nlm32_alpha_howto_table[r_type]; |
| 580 | |
| 581 | return TRUE; |
| 582 | } |
| 583 | |
| 584 | /* Mangle Alpha NLM relocs for output. */ |
| 585 | |
| 586 | static bfd_boolean |
| 587 | nlm_alpha_mangle_relocs (bfd *abfd ATTRIBUTE_UNUSED, |
| 588 | asection *sec ATTRIBUTE_UNUSED, |
| 589 | const void * data ATTRIBUTE_UNUSED, |
| 590 | bfd_vma offset ATTRIBUTE_UNUSED, |
| 591 | bfd_size_type count ATTRIBUTE_UNUSED) |
| 592 | { |
| 593 | return TRUE; |
| 594 | } |
| 595 | |
| 596 | /* Read an ALPHA NLM import record. */ |
| 597 | |
| 598 | static bfd_boolean |
| 599 | nlm_alpha_read_import (bfd *abfd, nlmNAME (symbol_type) * sym) |
| 600 | { |
| 601 | struct nlm_relent *nlm_relocs; /* Relocation records for symbol. */ |
| 602 | bfd_size_type rcount; /* Number of relocs. */ |
| 603 | bfd_byte temp[NLM_TARGET_LONG_SIZE]; /* Temporary 32-bit value. */ |
| 604 | unsigned char symlength; /* Length of symbol name. */ |
| 605 | char *name; |
| 606 | bfd_size_type amt; |
| 607 | |
| 608 | if (bfd_bread (& symlength, (bfd_size_type) sizeof (symlength), abfd) |
| 609 | != sizeof (symlength)) |
| 610 | return FALSE; |
| 611 | sym -> symbol.the_bfd = abfd; |
| 612 | name = bfd_alloc (abfd, (bfd_size_type) symlength + 1); |
| 613 | if (name == NULL) |
| 614 | return FALSE; |
| 615 | if (bfd_bread (name, (bfd_size_type) symlength, abfd) != symlength) |
| 616 | return FALSE; |
| 617 | name[symlength] = '\0'; |
| 618 | sym -> symbol.name = name; |
| 619 | sym -> symbol.flags = 0; |
| 620 | sym -> symbol.value = 0; |
| 621 | sym -> symbol.section = bfd_und_section_ptr; |
| 622 | if (bfd_bread (temp, (bfd_size_type) sizeof (temp), abfd) |
| 623 | != sizeof (temp)) |
| 624 | return FALSE; |
| 625 | rcount = H_GET_32 (abfd, temp); |
| 626 | amt = rcount * sizeof (struct nlm_relent); |
| 627 | nlm_relocs = bfd_alloc (abfd, amt); |
| 628 | if (!nlm_relocs) |
| 629 | return FALSE; |
| 630 | sym -> relocs = nlm_relocs; |
| 631 | sym -> rcnt = 0; |
| 632 | while (sym -> rcnt < rcount) |
| 633 | { |
| 634 | asection *section; |
| 635 | |
| 636 | if (! nlm_alpha_read_reloc (abfd, sym, §ion, &nlm_relocs -> reloc)) |
| 637 | return FALSE; |
| 638 | nlm_relocs -> section = section; |
| 639 | nlm_relocs++; |
| 640 | sym -> rcnt++; |
| 641 | } |
| 642 | |
| 643 | return TRUE; |
| 644 | } |
| 645 | |
| 646 | /* Write an Alpha NLM reloc. */ |
| 647 | |
| 648 | static bfd_boolean |
| 649 | nlm_alpha_write_import (bfd * abfd, asection * sec, arelent * rel) |
| 650 | { |
| 651 | asymbol *sym; |
| 652 | bfd_vma r_vaddr; |
| 653 | long r_symndx; |
| 654 | int r_type, r_extern, r_offset, r_size; |
| 655 | struct nlm32_alpha_external_reloc ext; |
| 656 | |
| 657 | sym = *rel->sym_ptr_ptr; |
| 658 | |
| 659 | /* Get values for the relocation fields. */ |
| 660 | r_type = rel->howto->type; |
| 661 | if (r_type != ALPHA_R_NW_RELOC) |
| 662 | { |
| 663 | r_vaddr = bfd_get_section_vma (abfd, sec) + rel->address; |
| 664 | if ((sec->flags & SEC_CODE) == 0) |
| 665 | r_vaddr += bfd_get_section_by_name (abfd, NLM_CODE_NAME) -> size; |
| 666 | if (bfd_is_und_section (bfd_get_section (sym))) |
| 667 | { |
| 668 | r_extern = 1; |
| 669 | r_symndx = 0; |
| 670 | } |
| 671 | else |
| 672 | { |
| 673 | r_extern = 0; |
| 674 | if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE) |
| 675 | r_symndx = ALPHA_RELOC_SECTION_TEXT; |
| 676 | else |
| 677 | r_symndx = ALPHA_RELOC_SECTION_DATA; |
| 678 | } |
| 679 | r_offset = 0; |
| 680 | r_size = 0; |
| 681 | |
| 682 | switch (r_type) |
| 683 | { |
| 684 | case ALPHA_R_LITUSE: |
| 685 | case ALPHA_R_GPDISP: |
| 686 | r_symndx = rel->addend; |
| 687 | break; |
| 688 | |
| 689 | case ALPHA_R_OP_STORE: |
| 690 | r_size = rel->addend & 0xff; |
| 691 | r_offset = (rel->addend >> 8) & 0xff; |
| 692 | break; |
| 693 | |
| 694 | case ALPHA_R_OP_PUSH: |
| 695 | case ALPHA_R_OP_PSUB: |
| 696 | case ALPHA_R_OP_PRSHIFT: |
| 697 | r_vaddr = rel->addend; |
| 698 | break; |
| 699 | |
| 700 | case ALPHA_R_IGNORE: |
| 701 | r_vaddr = rel->address; |
| 702 | break; |
| 703 | |
| 704 | default: |
| 705 | break; |
| 706 | } |
| 707 | } |
| 708 | else |
| 709 | { |
| 710 | /* r_type == ALPHA_R_NW_RELOC. */ |
| 711 | r_vaddr = rel->address; |
| 712 | if (rel->addend == 0) |
| 713 | { |
| 714 | r_symndx = 0; |
| 715 | r_size = ALPHA_R_NW_RELOC_SETGP; |
| 716 | } |
| 717 | else |
| 718 | { |
| 719 | r_symndx = rel->addend - 1; |
| 720 | r_size = ALPHA_R_NW_RELOC_LITA; |
| 721 | } |
| 722 | r_extern = 0; |
| 723 | r_offset = 0; |
| 724 | } |
| 725 | |
| 726 | /* Swap out the relocation fields. */ |
| 727 | H_PUT_64 (abfd, r_vaddr, ext.r_vaddr); |
| 728 | H_PUT_32 (abfd, r_symndx, ext.r_symndx); |
| 729 | |
| 730 | BFD_ASSERT (bfd_little_endian (abfd)); |
| 731 | |
| 732 | ext.r_bits[0] = ((r_type << RELOC_BITS0_TYPE_SH_LITTLE) |
| 733 | & RELOC_BITS0_TYPE_LITTLE); |
| 734 | ext.r_bits[1] = ((r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0) |
| 735 | | ((r_offset << RELOC_BITS1_OFFSET_SH_LITTLE) |
| 736 | & RELOC_BITS1_OFFSET_LITTLE)); |
| 737 | ext.r_bits[2] = 0; |
| 738 | ext.r_bits[3] = ((r_size << RELOC_BITS3_SIZE_SH_LITTLE) |
| 739 | & RELOC_BITS3_SIZE_LITTLE); |
| 740 | |
| 741 | /* Write out the relocation. */ |
| 742 | if (bfd_bwrite (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext) |
| 743 | return FALSE; |
| 744 | |
| 745 | return TRUE; |
| 746 | } |
| 747 | \f |
| 748 | /* Alpha NetWare does not use the high bit to determine whether a |
| 749 | public symbol is in the code segment or the data segment. Instead, |
| 750 | it just uses the address. The set_public_section and |
| 751 | get_public_offset routines override the default code which uses the |
| 752 | high bit. */ |
| 753 | |
| 754 | /* Set the section for a public symbol. */ |
| 755 | |
| 756 | static bfd_boolean |
| 757 | nlm_alpha_set_public_section (bfd * abfd, nlmNAME (symbol_type) * sym) |
| 758 | { |
| 759 | asection *code_sec, *data_sec; |
| 760 | |
| 761 | code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME); |
| 762 | data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME); |
| 763 | if (sym->symbol.value < code_sec->size) |
| 764 | { |
| 765 | sym->symbol.section = code_sec; |
| 766 | sym->symbol.flags |= BSF_FUNCTION; |
| 767 | } |
| 768 | else |
| 769 | { |
| 770 | sym->symbol.section = data_sec; |
| 771 | sym->symbol.value -= code_sec->size; |
| 772 | /* The data segment had better be aligned. */ |
| 773 | BFD_ASSERT ((code_sec->size & 0xf) == 0); |
| 774 | } |
| 775 | return TRUE; |
| 776 | } |
| 777 | |
| 778 | /* Get the offset to write out for a public symbol. */ |
| 779 | |
| 780 | static bfd_vma |
| 781 | nlm_alpha_get_public_offset (bfd * abfd ATTRIBUTE_UNUSED, asymbol * sym) |
| 782 | { |
| 783 | return bfd_asymbol_value (sym); |
| 784 | } |
| 785 | \f |
| 786 | /* Write an Alpha NLM external symbol. */ |
| 787 | |
| 788 | static bfd_boolean |
| 789 | nlm_alpha_write_external (bfd *abfd, |
| 790 | bfd_size_type count, |
| 791 | asymbol *sym, |
| 792 | struct reloc_and_sec *relocs) |
| 793 | { |
| 794 | bfd_size_type i; |
| 795 | bfd_byte len; |
| 796 | unsigned char temp[NLM_TARGET_LONG_SIZE]; |
| 797 | arelent r; |
| 798 | |
| 799 | len = strlen (sym->name); |
| 800 | if ((bfd_bwrite (&len, (bfd_size_type) sizeof (bfd_byte), abfd) |
| 801 | != sizeof (bfd_byte)) |
| 802 | || bfd_bwrite (sym->name, (bfd_size_type) len, abfd) != len) |
| 803 | return FALSE; |
| 804 | |
| 805 | bfd_put_32 (abfd, count + 2, temp); |
| 806 | if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp)) |
| 807 | return FALSE; |
| 808 | |
| 809 | /* The first two relocs for each external symbol are the .lita |
| 810 | address and the GP value. */ |
| 811 | r.sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; |
| 812 | r.howto = &nlm32_alpha_nw_howto; |
| 813 | |
| 814 | r.address = nlm_alpha_backend_data (abfd)->lita_address; |
| 815 | r.addend = nlm_alpha_backend_data (abfd)->lita_size + 1; |
| 816 | if (! nlm_alpha_write_import (abfd, NULL, &r)) |
| 817 | return FALSE; |
| 818 | |
| 819 | r.address = nlm_alpha_backend_data (abfd)->gp; |
| 820 | r.addend = 0; |
| 821 | if (! nlm_alpha_write_import (abfd, NULL, &r)) |
| 822 | return FALSE; |
| 823 | |
| 824 | for (i = 0; i < count; i++) |
| 825 | if (! nlm_alpha_write_import (abfd, relocs[i].sec, relocs[i].rel)) |
| 826 | return FALSE; |
| 827 | |
| 828 | return TRUE; |
| 829 | } |
| 830 | |
| 831 | #include "nlmswap.h" |
| 832 | |
| 833 | static const struct nlm_backend_data nlm32_alpha_backend = |
| 834 | { |
| 835 | "NetWare Alpha Module \032", |
| 836 | sizeof (Nlm32_alpha_External_Fixed_Header), |
| 837 | sizeof (struct nlm32_alpha_external_prefix_header), |
| 838 | bfd_arch_alpha, |
| 839 | 0, |
| 840 | TRUE, /* No uninitialized data permitted by Alpha NetWare. */ |
| 841 | nlm_alpha_backend_object_p, |
| 842 | nlm_alpha_write_prefix, |
| 843 | nlm_alpha_read_reloc, |
| 844 | nlm_alpha_mangle_relocs, |
| 845 | nlm_alpha_read_import, |
| 846 | nlm_alpha_write_import, |
| 847 | nlm_alpha_set_public_section, |
| 848 | nlm_alpha_get_public_offset, |
| 849 | nlm_swap_fixed_header_in, |
| 850 | nlm_swap_fixed_header_out, |
| 851 | nlm_alpha_write_external, |
| 852 | 0, /* Write_export. */ |
| 853 | }; |
| 854 | |
| 855 | #define TARGET_LITTLE_NAME "nlm32-alpha" |
| 856 | #define TARGET_LITTLE_SYM alpha_nlm32_vec |
| 857 | #define TARGET_BACKEND_DATA & nlm32_alpha_backend |
| 858 | |
| 859 | #include "nlm-target.h" |