| 1 | /* Target-dependent code for PowerPC systems using the SVR4 ABI |
| 2 | for GDB, the GNU debugger. |
| 3 | |
| 4 | Copyright (C) 2000-2020 Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "inferior.h" |
| 24 | #include "regcache.h" |
| 25 | #include "value.h" |
| 26 | #include "ppc-tdep.h" |
| 27 | #include "target.h" |
| 28 | #include "objfiles.h" |
| 29 | #include "infcall.h" |
| 30 | #include "dwarf2.h" |
| 31 | #include "target-float.h" |
| 32 | #include <algorithm> |
| 33 | |
| 34 | |
| 35 | /* Check whether FTPYE is a (pointer to) function type that should use |
| 36 | the OpenCL vector ABI. */ |
| 37 | |
| 38 | static int |
| 39 | ppc_sysv_use_opencl_abi (struct type *ftype) |
| 40 | { |
| 41 | ftype = check_typedef (ftype); |
| 42 | |
| 43 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 44 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 45 | |
| 46 | return (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 47 | && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL); |
| 48 | } |
| 49 | |
| 50 | /* Pass the arguments in either registers, or in the stack. Using the |
| 51 | ppc sysv ABI, the first eight words of the argument list (that might |
| 52 | be less than eight parameters if some parameters occupy more than one |
| 53 | word) are passed in r3..r10 registers. float and double parameters are |
| 54 | passed in fpr's, in addition to that. Rest of the parameters if any |
| 55 | are passed in user stack. |
| 56 | |
| 57 | If the function is returning a structure, then the return address is passed |
| 58 | in r3, then the first 7 words of the parameters can be passed in registers, |
| 59 | starting from r4. */ |
| 60 | |
| 61 | CORE_ADDR |
| 62 | ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 63 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 64 | int nargs, struct value **args, CORE_ADDR sp, |
| 65 | function_call_return_method return_method, |
| 66 | CORE_ADDR struct_addr) |
| 67 | { |
| 68 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 69 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 70 | int opencl_abi = ppc_sysv_use_opencl_abi (value_type (function)); |
| 71 | ULONGEST saved_sp; |
| 72 | int argspace = 0; /* 0 is an initial wrong guess. */ |
| 73 | int write_pass; |
| 74 | |
| 75 | gdb_assert (tdep->wordsize == 4); |
| 76 | |
| 77 | regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch), |
| 78 | &saved_sp); |
| 79 | |
| 80 | /* Go through the argument list twice. |
| 81 | |
| 82 | Pass 1: Figure out how much new stack space is required for |
| 83 | arguments and pushed values. Unlike the PowerOpen ABI, the SysV |
| 84 | ABI doesn't reserve any extra space for parameters which are put |
| 85 | in registers, but does always push structures and then pass their |
| 86 | address. |
| 87 | |
| 88 | Pass 2: Replay the same computation but this time also write the |
| 89 | values out to the target. */ |
| 90 | |
| 91 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 92 | { |
| 93 | int argno; |
| 94 | /* Next available floating point register for float and double |
| 95 | arguments. */ |
| 96 | int freg = 1; |
| 97 | /* Next available general register for non-float, non-vector |
| 98 | arguments. */ |
| 99 | int greg = 3; |
| 100 | /* Next available vector register for vector arguments. */ |
| 101 | int vreg = 2; |
| 102 | /* Arguments start above the "LR save word" and "Back chain". */ |
| 103 | int argoffset = 2 * tdep->wordsize; |
| 104 | /* Structures start after the arguments. */ |
| 105 | int structoffset = argoffset + argspace; |
| 106 | |
| 107 | /* If the function is returning a `struct', then the first word |
| 108 | (which will be passed in r3) is used for struct return |
| 109 | address. In that case we should advance one word and start |
| 110 | from r4 register to copy parameters. */ |
| 111 | if (return_method == return_method_struct) |
| 112 | { |
| 113 | if (write_pass) |
| 114 | regcache_cooked_write_signed (regcache, |
| 115 | tdep->ppc_gp0_regnum + greg, |
| 116 | struct_addr); |
| 117 | greg++; |
| 118 | } |
| 119 | |
| 120 | for (argno = 0; argno < nargs; argno++) |
| 121 | { |
| 122 | struct value *arg = args[argno]; |
| 123 | struct type *type = check_typedef (value_type (arg)); |
| 124 | int len = TYPE_LENGTH (type); |
| 125 | const bfd_byte *val = value_contents (arg); |
| 126 | |
| 127 | if (TYPE_CODE (type) == TYPE_CODE_FLT && len <= 8 |
| 128 | && !tdep->soft_float) |
| 129 | { |
| 130 | /* Floating point value converted to "double" then |
| 131 | passed in an FP register, when the registers run out, |
| 132 | 8 byte aligned stack is used. */ |
| 133 | if (freg <= 8) |
| 134 | { |
| 135 | if (write_pass) |
| 136 | { |
| 137 | /* Always store the floating point value using |
| 138 | the register's floating-point format. */ |
| 139 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 140 | struct type *regtype |
| 141 | = register_type (gdbarch, tdep->ppc_fp0_regnum + freg); |
| 142 | target_float_convert (val, type, regval, regtype); |
| 143 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg, |
| 144 | regval); |
| 145 | } |
| 146 | freg++; |
| 147 | } |
| 148 | else |
| 149 | { |
| 150 | /* The SysV ABI tells us to convert floats to |
| 151 | doubles before writing them to an 8 byte aligned |
| 152 | stack location. Unfortunately GCC does not do |
| 153 | that, and stores floats into 4 byte aligned |
| 154 | locations without converting them to doubles. |
| 155 | Since there is no know compiler that actually |
| 156 | follows the ABI here, we implement the GCC |
| 157 | convention. */ |
| 158 | |
| 159 | /* Align to 4 bytes or 8 bytes depending on the type of |
| 160 | the argument (float or double). */ |
| 161 | argoffset = align_up (argoffset, len); |
| 162 | if (write_pass) |
| 163 | write_memory (sp + argoffset, val, len); |
| 164 | argoffset += len; |
| 165 | } |
| 166 | } |
| 167 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 168 | && len == 16 |
| 169 | && !tdep->soft_float |
| 170 | && (gdbarch_long_double_format (gdbarch) |
| 171 | == floatformats_ibm_long_double)) |
| 172 | { |
| 173 | /* IBM long double passed in two FP registers if |
| 174 | available, otherwise 8-byte aligned stack. */ |
| 175 | if (freg <= 7) |
| 176 | { |
| 177 | if (write_pass) |
| 178 | { |
| 179 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg, val); |
| 180 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg + 1, |
| 181 | val + 8); |
| 182 | } |
| 183 | freg += 2; |
| 184 | } |
| 185 | else |
| 186 | { |
| 187 | argoffset = align_up (argoffset, 8); |
| 188 | if (write_pass) |
| 189 | write_memory (sp + argoffset, val, len); |
| 190 | argoffset += 16; |
| 191 | } |
| 192 | } |
| 193 | else if (len == 8 |
| 194 | && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */ |
| 195 | || TYPE_CODE (type) == TYPE_CODE_FLT /* double */ |
| 196 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT |
| 197 | && tdep->soft_float))) |
| 198 | { |
| 199 | /* "long long" or soft-float "double" or "_Decimal64" |
| 200 | passed in an odd/even register pair with the low |
| 201 | addressed word in the odd register and the high |
| 202 | addressed word in the even register, or when the |
| 203 | registers run out an 8 byte aligned stack |
| 204 | location. */ |
| 205 | if (greg > 9) |
| 206 | { |
| 207 | /* Just in case GREG was 10. */ |
| 208 | greg = 11; |
| 209 | argoffset = align_up (argoffset, 8); |
| 210 | if (write_pass) |
| 211 | write_memory (sp + argoffset, val, len); |
| 212 | argoffset += 8; |
| 213 | } |
| 214 | else |
| 215 | { |
| 216 | /* Must start on an odd register - r3/r4 etc. */ |
| 217 | if ((greg & 1) == 0) |
| 218 | greg++; |
| 219 | if (write_pass) |
| 220 | { |
| 221 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 0, |
| 222 | val + 0); |
| 223 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 1, |
| 224 | val + 4); |
| 225 | } |
| 226 | greg += 2; |
| 227 | } |
| 228 | } |
| 229 | else if (len == 16 |
| 230 | && ((TYPE_CODE (type) == TYPE_CODE_FLT |
| 231 | && (gdbarch_long_double_format (gdbarch) |
| 232 | == floatformats_ibm_long_double)) |
| 233 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT |
| 234 | && tdep->soft_float))) |
| 235 | { |
| 236 | /* Soft-float IBM long double or _Decimal128 passed in |
| 237 | four consecutive registers, or on the stack. The |
| 238 | registers are not necessarily odd/even pairs. */ |
| 239 | if (greg > 7) |
| 240 | { |
| 241 | greg = 11; |
| 242 | argoffset = align_up (argoffset, 8); |
| 243 | if (write_pass) |
| 244 | write_memory (sp + argoffset, val, len); |
| 245 | argoffset += 16; |
| 246 | } |
| 247 | else |
| 248 | { |
| 249 | if (write_pass) |
| 250 | { |
| 251 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 0, |
| 252 | val + 0); |
| 253 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 1, |
| 254 | val + 4); |
| 255 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 2, |
| 256 | val + 8); |
| 257 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg + 3, |
| 258 | val + 12); |
| 259 | } |
| 260 | greg += 4; |
| 261 | } |
| 262 | } |
| 263 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len <= 8 |
| 264 | && !tdep->soft_float) |
| 265 | { |
| 266 | /* 32-bit and 64-bit decimal floats go in f1 .. f8. They can |
| 267 | end up in memory. */ |
| 268 | |
| 269 | if (freg <= 8) |
| 270 | { |
| 271 | if (write_pass) |
| 272 | { |
| 273 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 274 | const gdb_byte *p; |
| 275 | |
| 276 | /* 32-bit decimal floats are right aligned in the |
| 277 | doubleword. */ |
| 278 | if (TYPE_LENGTH (type) == 4) |
| 279 | { |
| 280 | memcpy (regval + 4, val, 4); |
| 281 | p = regval; |
| 282 | } |
| 283 | else |
| 284 | p = val; |
| 285 | |
| 286 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg, p); |
| 287 | } |
| 288 | |
| 289 | freg++; |
| 290 | } |
| 291 | else |
| 292 | { |
| 293 | argoffset = align_up (argoffset, len); |
| 294 | |
| 295 | if (write_pass) |
| 296 | /* Write value in the stack's parameter save area. */ |
| 297 | write_memory (sp + argoffset, val, len); |
| 298 | |
| 299 | argoffset += len; |
| 300 | } |
| 301 | } |
| 302 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len == 16 |
| 303 | && !tdep->soft_float) |
| 304 | { |
| 305 | /* 128-bit decimal floats go in f2 .. f7, always in even/odd |
| 306 | pairs. They can end up in memory, using two doublewords. */ |
| 307 | |
| 308 | if (freg <= 6) |
| 309 | { |
| 310 | /* Make sure freg is even. */ |
| 311 | freg += freg & 1; |
| 312 | |
| 313 | if (write_pass) |
| 314 | { |
| 315 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg, val); |
| 316 | regcache->cooked_write (tdep->ppc_fp0_regnum + freg + 1, |
| 317 | val + 8); |
| 318 | } |
| 319 | } |
| 320 | else |
| 321 | { |
| 322 | argoffset = align_up (argoffset, 8); |
| 323 | |
| 324 | if (write_pass) |
| 325 | write_memory (sp + argoffset, val, 16); |
| 326 | |
| 327 | argoffset += 16; |
| 328 | } |
| 329 | |
| 330 | /* If a 128-bit decimal float goes to the stack because only f7 |
| 331 | and f8 are free (thus there's no even/odd register pair |
| 332 | available), these registers should be marked as occupied. |
| 333 | Hence we increase freg even when writing to memory. */ |
| 334 | freg += 2; |
| 335 | } |
| 336 | else if (len < 16 |
| 337 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 338 | && TYPE_VECTOR (type) |
| 339 | && opencl_abi) |
| 340 | { |
| 341 | /* OpenCL vectors shorter than 16 bytes are passed as if |
| 342 | a series of independent scalars. */ |
| 343 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 344 | int i, nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 345 | |
| 346 | for (i = 0; i < nelt; i++) |
| 347 | { |
| 348 | const gdb_byte *elval = val + i * TYPE_LENGTH (eltype); |
| 349 | |
| 350 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT && !tdep->soft_float) |
| 351 | { |
| 352 | if (freg <= 8) |
| 353 | { |
| 354 | if (write_pass) |
| 355 | { |
| 356 | int regnum = tdep->ppc_fp0_regnum + freg; |
| 357 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 358 | struct type *regtype |
| 359 | = register_type (gdbarch, regnum); |
| 360 | target_float_convert (elval, eltype, |
| 361 | regval, regtype); |
| 362 | regcache->cooked_write (regnum, regval); |
| 363 | } |
| 364 | freg++; |
| 365 | } |
| 366 | else |
| 367 | { |
| 368 | argoffset = align_up (argoffset, len); |
| 369 | if (write_pass) |
| 370 | write_memory (sp + argoffset, val, len); |
| 371 | argoffset += len; |
| 372 | } |
| 373 | } |
| 374 | else if (TYPE_LENGTH (eltype) == 8) |
| 375 | { |
| 376 | if (greg > 9) |
| 377 | { |
| 378 | /* Just in case GREG was 10. */ |
| 379 | greg = 11; |
| 380 | argoffset = align_up (argoffset, 8); |
| 381 | if (write_pass) |
| 382 | write_memory (sp + argoffset, elval, |
| 383 | TYPE_LENGTH (eltype)); |
| 384 | argoffset += 8; |
| 385 | } |
| 386 | else |
| 387 | { |
| 388 | /* Must start on an odd register - r3/r4 etc. */ |
| 389 | if ((greg & 1) == 0) |
| 390 | greg++; |
| 391 | if (write_pass) |
| 392 | { |
| 393 | int regnum = tdep->ppc_gp0_regnum + greg; |
| 394 | regcache->cooked_write (regnum + 0, elval + 0); |
| 395 | regcache->cooked_write (regnum + 1, elval + 4); |
| 396 | } |
| 397 | greg += 2; |
| 398 | } |
| 399 | } |
| 400 | else |
| 401 | { |
| 402 | gdb_byte word[PPC_MAX_REGISTER_SIZE]; |
| 403 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 404 | unpack_long (eltype, elval)); |
| 405 | |
| 406 | if (greg <= 10) |
| 407 | { |
| 408 | if (write_pass) |
| 409 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg, |
| 410 | word); |
| 411 | greg++; |
| 412 | } |
| 413 | else |
| 414 | { |
| 415 | argoffset = align_up (argoffset, tdep->wordsize); |
| 416 | if (write_pass) |
| 417 | write_memory (sp + argoffset, word, tdep->wordsize); |
| 418 | argoffset += tdep->wordsize; |
| 419 | } |
| 420 | } |
| 421 | } |
| 422 | } |
| 423 | else if (len >= 16 |
| 424 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 425 | && TYPE_VECTOR (type) |
| 426 | && opencl_abi) |
| 427 | { |
| 428 | /* OpenCL vectors 16 bytes or longer are passed as if |
| 429 | a series of AltiVec vectors. */ |
| 430 | int i; |
| 431 | |
| 432 | for (i = 0; i < len / 16; i++) |
| 433 | { |
| 434 | const gdb_byte *elval = val + i * 16; |
| 435 | |
| 436 | if (vreg <= 13) |
| 437 | { |
| 438 | if (write_pass) |
| 439 | regcache->cooked_write (tdep->ppc_vr0_regnum + vreg, |
| 440 | elval); |
| 441 | vreg++; |
| 442 | } |
| 443 | else |
| 444 | { |
| 445 | argoffset = align_up (argoffset, 16); |
| 446 | if (write_pass) |
| 447 | write_memory (sp + argoffset, elval, 16); |
| 448 | argoffset += 16; |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | else if (len == 16 |
| 453 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 454 | && TYPE_VECTOR (type) |
| 455 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 456 | { |
| 457 | /* Vector parameter passed in an Altivec register, or |
| 458 | when that runs out, 16 byte aligned stack location. */ |
| 459 | if (vreg <= 13) |
| 460 | { |
| 461 | if (write_pass) |
| 462 | regcache->cooked_write (tdep->ppc_vr0_regnum + vreg, val); |
| 463 | vreg++; |
| 464 | } |
| 465 | else |
| 466 | { |
| 467 | argoffset = align_up (argoffset, 16); |
| 468 | if (write_pass) |
| 469 | write_memory (sp + argoffset, val, 16); |
| 470 | argoffset += 16; |
| 471 | } |
| 472 | } |
| 473 | else if (len == 8 |
| 474 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 475 | && TYPE_VECTOR (type) |
| 476 | && tdep->vector_abi == POWERPC_VEC_SPE) |
| 477 | { |
| 478 | /* Vector parameter passed in an e500 register, or when |
| 479 | that runs out, 8 byte aligned stack location. Note |
| 480 | that since e500 vector and general purpose registers |
| 481 | both map onto the same underlying register set, a |
| 482 | "greg" and not a "vreg" is consumed here. A cooked |
| 483 | write stores the value in the correct locations |
| 484 | within the raw register cache. */ |
| 485 | if (greg <= 10) |
| 486 | { |
| 487 | if (write_pass) |
| 488 | regcache->cooked_write (tdep->ppc_ev0_regnum + greg, val); |
| 489 | greg++; |
| 490 | } |
| 491 | else |
| 492 | { |
| 493 | argoffset = align_up (argoffset, 8); |
| 494 | if (write_pass) |
| 495 | write_memory (sp + argoffset, val, 8); |
| 496 | argoffset += 8; |
| 497 | } |
| 498 | } |
| 499 | else |
| 500 | { |
| 501 | /* Reduce the parameter down to something that fits in a |
| 502 | "word". */ |
| 503 | gdb_byte word[PPC_MAX_REGISTER_SIZE]; |
| 504 | memset (word, 0, PPC_MAX_REGISTER_SIZE); |
| 505 | if (len > tdep->wordsize |
| 506 | || TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 507 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 508 | { |
| 509 | /* Structs and large values are put in an |
| 510 | aligned stack slot ... */ |
| 511 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 512 | && TYPE_VECTOR (type) |
| 513 | && len >= 16) |
| 514 | structoffset = align_up (structoffset, 16); |
| 515 | else |
| 516 | structoffset = align_up (structoffset, 8); |
| 517 | |
| 518 | if (write_pass) |
| 519 | write_memory (sp + structoffset, val, len); |
| 520 | /* ... and then a "word" pointing to that address is |
| 521 | passed as the parameter. */ |
| 522 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 523 | sp + structoffset); |
| 524 | structoffset += len; |
| 525 | } |
| 526 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 527 | /* Sign or zero extend the "int" into a "word". */ |
| 528 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 529 | unpack_long (type, val)); |
| 530 | else |
| 531 | /* Always goes in the low address. */ |
| 532 | memcpy (word, val, len); |
| 533 | /* Store that "word" in a register, or on the stack. |
| 534 | The words have "4" byte alignment. */ |
| 535 | if (greg <= 10) |
| 536 | { |
| 537 | if (write_pass) |
| 538 | regcache->cooked_write (tdep->ppc_gp0_regnum + greg, word); |
| 539 | greg++; |
| 540 | } |
| 541 | else |
| 542 | { |
| 543 | argoffset = align_up (argoffset, tdep->wordsize); |
| 544 | if (write_pass) |
| 545 | write_memory (sp + argoffset, word, tdep->wordsize); |
| 546 | argoffset += tdep->wordsize; |
| 547 | } |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | /* Compute the actual stack space requirements. */ |
| 552 | if (!write_pass) |
| 553 | { |
| 554 | /* Remember the amount of space needed by the arguments. */ |
| 555 | argspace = argoffset; |
| 556 | /* Allocate space for both the arguments and the structures. */ |
| 557 | sp -= (argoffset + structoffset); |
| 558 | /* Ensure that the stack is still 16 byte aligned. */ |
| 559 | sp = align_down (sp, 16); |
| 560 | } |
| 561 | |
| 562 | /* The psABI says that "A caller of a function that takes a |
| 563 | variable argument list shall set condition register bit 6 to |
| 564 | 1 if it passes one or more arguments in the floating-point |
| 565 | registers. It is strongly recommended that the caller set the |
| 566 | bit to 0 otherwise..." Doing this for normal functions too |
| 567 | shouldn't hurt. */ |
| 568 | if (write_pass) |
| 569 | { |
| 570 | ULONGEST cr; |
| 571 | |
| 572 | regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr); |
| 573 | if (freg > 1) |
| 574 | cr |= 0x02000000; |
| 575 | else |
| 576 | cr &= ~0x02000000; |
| 577 | regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr); |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | /* Update %sp. */ |
| 582 | regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp); |
| 583 | |
| 584 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 585 | write_memory_signed_integer (sp, tdep->wordsize, byte_order, saved_sp); |
| 586 | |
| 587 | /* Point the inferior function call's return address at the dummy's |
| 588 | breakpoint. */ |
| 589 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 590 | |
| 591 | return sp; |
| 592 | } |
| 593 | |
| 594 | /* Handle the return-value conventions for Decimal Floating Point values. */ |
| 595 | static enum return_value_convention |
| 596 | get_decimal_float_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 597 | struct regcache *regcache, gdb_byte *readbuf, |
| 598 | const gdb_byte *writebuf) |
| 599 | { |
| 600 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 601 | |
| 602 | gdb_assert (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT); |
| 603 | |
| 604 | /* 32-bit and 64-bit decimal floats in f1. */ |
| 605 | if (TYPE_LENGTH (valtype) <= 8) |
| 606 | { |
| 607 | if (writebuf != NULL) |
| 608 | { |
| 609 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 610 | const gdb_byte *p; |
| 611 | |
| 612 | /* 32-bit decimal float is right aligned in the doubleword. */ |
| 613 | if (TYPE_LENGTH (valtype) == 4) |
| 614 | { |
| 615 | memcpy (regval + 4, writebuf, 4); |
| 616 | p = regval; |
| 617 | } |
| 618 | else |
| 619 | p = writebuf; |
| 620 | |
| 621 | regcache->cooked_write (tdep->ppc_fp0_regnum + 1, p); |
| 622 | } |
| 623 | if (readbuf != NULL) |
| 624 | { |
| 625 | regcache->cooked_read (tdep->ppc_fp0_regnum + 1, readbuf); |
| 626 | |
| 627 | /* Left align 32-bit decimal float. */ |
| 628 | if (TYPE_LENGTH (valtype) == 4) |
| 629 | memcpy (readbuf, readbuf + 4, 4); |
| 630 | } |
| 631 | } |
| 632 | /* 128-bit decimal floats in f2,f3. */ |
| 633 | else if (TYPE_LENGTH (valtype) == 16) |
| 634 | { |
| 635 | if (writebuf != NULL || readbuf != NULL) |
| 636 | { |
| 637 | int i; |
| 638 | |
| 639 | for (i = 0; i < 2; i++) |
| 640 | { |
| 641 | if (writebuf != NULL) |
| 642 | regcache->cooked_write (tdep->ppc_fp0_regnum + 2 + i, |
| 643 | writebuf + i * 8); |
| 644 | if (readbuf != NULL) |
| 645 | regcache->cooked_read (tdep->ppc_fp0_regnum + 2 + i, |
| 646 | readbuf + i * 8); |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | else |
| 651 | /* Can't happen. */ |
| 652 | internal_error (__FILE__, __LINE__, _("Unknown decimal float size.")); |
| 653 | |
| 654 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 655 | } |
| 656 | |
| 657 | /* Handle the return-value conventions specified by the SysV 32-bit |
| 658 | PowerPC ABI (including all the supplements): |
| 659 | |
| 660 | no floating-point: floating-point values returned using 32-bit |
| 661 | general-purpose registers. |
| 662 | |
| 663 | Altivec: 128-bit vectors returned using vector registers. |
| 664 | |
| 665 | e500: 64-bit vectors returned using the full full 64 bit EV |
| 666 | register, floating-point values returned using 32-bit |
| 667 | general-purpose registers. |
| 668 | |
| 669 | GCC (broken): Small struct values right (instead of left) aligned |
| 670 | when returned in general-purpose registers. */ |
| 671 | |
| 672 | static enum return_value_convention |
| 673 | do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *func_type, |
| 674 | struct type *type, struct regcache *regcache, |
| 675 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 676 | int broken_gcc) |
| 677 | { |
| 678 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 679 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 680 | int opencl_abi = func_type? ppc_sysv_use_opencl_abi (func_type) : 0; |
| 681 | |
| 682 | gdb_assert (tdep->wordsize == 4); |
| 683 | |
| 684 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 685 | && TYPE_LENGTH (type) <= 8 |
| 686 | && !tdep->soft_float) |
| 687 | { |
| 688 | if (readbuf) |
| 689 | { |
| 690 | /* Floats and doubles stored in "f1". Convert the value to |
| 691 | the required type. */ |
| 692 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 693 | struct type *regtype = register_type (gdbarch, |
| 694 | tdep->ppc_fp0_regnum + 1); |
| 695 | regcache->cooked_read (tdep->ppc_fp0_regnum + 1, regval); |
| 696 | target_float_convert (regval, regtype, readbuf, type); |
| 697 | } |
| 698 | if (writebuf) |
| 699 | { |
| 700 | /* Floats and doubles stored in "f1". Convert the value to |
| 701 | the register's "double" type. */ |
| 702 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 703 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 704 | target_float_convert (writebuf, type, regval, regtype); |
| 705 | regcache->cooked_write (tdep->ppc_fp0_regnum + 1, regval); |
| 706 | } |
| 707 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 708 | } |
| 709 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 710 | && TYPE_LENGTH (type) == 16 |
| 711 | && !tdep->soft_float |
| 712 | && (gdbarch_long_double_format (gdbarch) |
| 713 | == floatformats_ibm_long_double)) |
| 714 | { |
| 715 | /* IBM long double stored in f1 and f2. */ |
| 716 | if (readbuf) |
| 717 | { |
| 718 | regcache->cooked_read (tdep->ppc_fp0_regnum + 1, readbuf); |
| 719 | regcache->cooked_read (tdep->ppc_fp0_regnum + 2, readbuf + 8); |
| 720 | } |
| 721 | if (writebuf) |
| 722 | { |
| 723 | regcache->cooked_write (tdep->ppc_fp0_regnum + 1, writebuf); |
| 724 | regcache->cooked_write (tdep->ppc_fp0_regnum + 2, writebuf + 8); |
| 725 | } |
| 726 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 727 | } |
| 728 | if (TYPE_LENGTH (type) == 16 |
| 729 | && ((TYPE_CODE (type) == TYPE_CODE_FLT |
| 730 | && (gdbarch_long_double_format (gdbarch) |
| 731 | == floatformats_ibm_long_double)) |
| 732 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && tdep->soft_float))) |
| 733 | { |
| 734 | /* Soft-float IBM long double or _Decimal128 stored in r3, r4, |
| 735 | r5, r6. */ |
| 736 | if (readbuf) |
| 737 | { |
| 738 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, readbuf); |
| 739 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, readbuf + 4); |
| 740 | regcache->cooked_read (tdep->ppc_gp0_regnum + 5, readbuf + 8); |
| 741 | regcache->cooked_read (tdep->ppc_gp0_regnum + 6, readbuf + 12); |
| 742 | } |
| 743 | if (writebuf) |
| 744 | { |
| 745 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, writebuf); |
| 746 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, writebuf + 4); |
| 747 | regcache->cooked_write (tdep->ppc_gp0_regnum + 5, writebuf + 8); |
| 748 | regcache->cooked_write (tdep->ppc_gp0_regnum + 6, writebuf + 12); |
| 749 | } |
| 750 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 751 | } |
| 752 | if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) |
| 753 | || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8) |
| 754 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && TYPE_LENGTH (type) == 8 |
| 755 | && tdep->soft_float)) |
| 756 | { |
| 757 | if (readbuf) |
| 758 | { |
| 759 | /* A long long, double or _Decimal64 stored in the 32 bit |
| 760 | r3/r4. */ |
| 761 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, readbuf + 0); |
| 762 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, readbuf + 4); |
| 763 | } |
| 764 | if (writebuf) |
| 765 | { |
| 766 | /* A long long, double or _Decimal64 stored in the 32 bit |
| 767 | r3/r4. */ |
| 768 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, writebuf + 0); |
| 769 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, writebuf + 4); |
| 770 | } |
| 771 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 772 | } |
| 773 | if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && !tdep->soft_float) |
| 774 | return get_decimal_float_return_value (gdbarch, type, regcache, readbuf, |
| 775 | writebuf); |
| 776 | else if ((TYPE_CODE (type) == TYPE_CODE_INT |
| 777 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 778 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 779 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 780 | || TYPE_IS_REFERENCE (type) |
| 781 | || TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 782 | && TYPE_LENGTH (type) <= tdep->wordsize) |
| 783 | { |
| 784 | if (readbuf) |
| 785 | { |
| 786 | /* Some sort of integer stored in r3. Since TYPE isn't |
| 787 | bigger than the register, sign extension isn't a problem |
| 788 | - just do everything unsigned. */ |
| 789 | ULONGEST regval; |
| 790 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 791 | ®val); |
| 792 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), byte_order, |
| 793 | regval); |
| 794 | } |
| 795 | if (writebuf) |
| 796 | { |
| 797 | /* Some sort of integer stored in r3. Use unpack_long since |
| 798 | that should handle any required sign extension. */ |
| 799 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 800 | unpack_long (type, writebuf)); |
| 801 | } |
| 802 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 803 | } |
| 804 | /* OpenCL vectors < 16 bytes are returned as distinct |
| 805 | scalars in f1..f2 or r3..r10. */ |
| 806 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 807 | && TYPE_VECTOR (type) |
| 808 | && TYPE_LENGTH (type) < 16 |
| 809 | && opencl_abi) |
| 810 | { |
| 811 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 812 | int i, nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 813 | |
| 814 | for (i = 0; i < nelt; i++) |
| 815 | { |
| 816 | int offset = i * TYPE_LENGTH (eltype); |
| 817 | |
| 818 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT) |
| 819 | { |
| 820 | int regnum = tdep->ppc_fp0_regnum + 1 + i; |
| 821 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 822 | struct type *regtype = register_type (gdbarch, regnum); |
| 823 | |
| 824 | if (writebuf != NULL) |
| 825 | { |
| 826 | target_float_convert (writebuf + offset, eltype, |
| 827 | regval, regtype); |
| 828 | regcache->cooked_write (regnum, regval); |
| 829 | } |
| 830 | if (readbuf != NULL) |
| 831 | { |
| 832 | regcache->cooked_read (regnum, regval); |
| 833 | target_float_convert (regval, regtype, |
| 834 | readbuf + offset, eltype); |
| 835 | } |
| 836 | } |
| 837 | else |
| 838 | { |
| 839 | int regnum = tdep->ppc_gp0_regnum + 3 + i; |
| 840 | ULONGEST regval; |
| 841 | |
| 842 | if (writebuf != NULL) |
| 843 | { |
| 844 | regval = unpack_long (eltype, writebuf + offset); |
| 845 | regcache_cooked_write_unsigned (regcache, regnum, regval); |
| 846 | } |
| 847 | if (readbuf != NULL) |
| 848 | { |
| 849 | regcache_cooked_read_unsigned (regcache, regnum, ®val); |
| 850 | store_unsigned_integer (readbuf + offset, |
| 851 | TYPE_LENGTH (eltype), byte_order, |
| 852 | regval); |
| 853 | } |
| 854 | } |
| 855 | } |
| 856 | |
| 857 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 858 | } |
| 859 | /* OpenCL vectors >= 16 bytes are returned in v2..v9. */ |
| 860 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 861 | && TYPE_VECTOR (type) |
| 862 | && TYPE_LENGTH (type) >= 16 |
| 863 | && opencl_abi) |
| 864 | { |
| 865 | int n_regs = TYPE_LENGTH (type) / 16; |
| 866 | int i; |
| 867 | |
| 868 | for (i = 0; i < n_regs; i++) |
| 869 | { |
| 870 | int offset = i * 16; |
| 871 | int regnum = tdep->ppc_vr0_regnum + 2 + i; |
| 872 | |
| 873 | if (writebuf != NULL) |
| 874 | regcache->cooked_write (regnum, writebuf + offset); |
| 875 | if (readbuf != NULL) |
| 876 | regcache->cooked_read (regnum, readbuf + offset); |
| 877 | } |
| 878 | |
| 879 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 880 | } |
| 881 | if (TYPE_LENGTH (type) == 16 |
| 882 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 883 | && TYPE_VECTOR (type) |
| 884 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 885 | { |
| 886 | if (readbuf) |
| 887 | { |
| 888 | /* Altivec places the return value in "v2". */ |
| 889 | regcache->cooked_read (tdep->ppc_vr0_regnum + 2, readbuf); |
| 890 | } |
| 891 | if (writebuf) |
| 892 | { |
| 893 | /* Altivec places the return value in "v2". */ |
| 894 | regcache->cooked_write (tdep->ppc_vr0_regnum + 2, writebuf); |
| 895 | } |
| 896 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 897 | } |
| 898 | if (TYPE_LENGTH (type) == 16 |
| 899 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 900 | && TYPE_VECTOR (type) |
| 901 | && tdep->vector_abi == POWERPC_VEC_GENERIC) |
| 902 | { |
| 903 | /* GCC -maltivec -mabi=no-altivec returns vectors in r3/r4/r5/r6. |
| 904 | GCC without AltiVec returns them in memory, but it warns about |
| 905 | ABI risks in that case; we don't try to support it. */ |
| 906 | if (readbuf) |
| 907 | { |
| 908 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, readbuf + 0); |
| 909 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, readbuf + 4); |
| 910 | regcache->cooked_read (tdep->ppc_gp0_regnum + 5, readbuf + 8); |
| 911 | regcache->cooked_read (tdep->ppc_gp0_regnum + 6, readbuf + 12); |
| 912 | } |
| 913 | if (writebuf) |
| 914 | { |
| 915 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, writebuf + 0); |
| 916 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, writebuf + 4); |
| 917 | regcache->cooked_write (tdep->ppc_gp0_regnum + 5, writebuf + 8); |
| 918 | regcache->cooked_write (tdep->ppc_gp0_regnum + 6, writebuf + 12); |
| 919 | } |
| 920 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 921 | } |
| 922 | if (TYPE_LENGTH (type) == 8 |
| 923 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 924 | && TYPE_VECTOR (type) |
| 925 | && tdep->vector_abi == POWERPC_VEC_SPE) |
| 926 | { |
| 927 | /* The e500 ABI places return values for the 64-bit DSP types |
| 928 | (__ev64_opaque__) in r3. However, in GDB-speak, ev3 |
| 929 | corresponds to the entire r3 value for e500, whereas GDB's r3 |
| 930 | only corresponds to the least significant 32-bits. So place |
| 931 | the 64-bit DSP type's value in ev3. */ |
| 932 | if (readbuf) |
| 933 | regcache->cooked_read (tdep->ppc_ev0_regnum + 3, readbuf); |
| 934 | if (writebuf) |
| 935 | regcache->cooked_write (tdep->ppc_ev0_regnum + 3, writebuf); |
| 936 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 937 | } |
| 938 | if (broken_gcc && TYPE_LENGTH (type) <= 8) |
| 939 | { |
| 940 | /* GCC screwed up for structures or unions whose size is less |
| 941 | than or equal to 8 bytes.. Instead of left-aligning, it |
| 942 | right-aligns the data into the buffer formed by r3, r4. */ |
| 943 | gdb_byte regvals[PPC_MAX_REGISTER_SIZE * 2]; |
| 944 | int len = TYPE_LENGTH (type); |
| 945 | int offset = (2 * tdep->wordsize - len) % tdep->wordsize; |
| 946 | |
| 947 | if (readbuf) |
| 948 | { |
| 949 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, |
| 950 | regvals + 0 * tdep->wordsize); |
| 951 | if (len > tdep->wordsize) |
| 952 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, |
| 953 | regvals + 1 * tdep->wordsize); |
| 954 | memcpy (readbuf, regvals + offset, len); |
| 955 | } |
| 956 | if (writebuf) |
| 957 | { |
| 958 | memset (regvals, 0, sizeof regvals); |
| 959 | memcpy (regvals + offset, writebuf, len); |
| 960 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, |
| 961 | regvals + 0 * tdep->wordsize); |
| 962 | if (len > tdep->wordsize) |
| 963 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, |
| 964 | regvals + 1 * tdep->wordsize); |
| 965 | } |
| 966 | |
| 967 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 968 | } |
| 969 | if (TYPE_LENGTH (type) <= 8) |
| 970 | { |
| 971 | if (readbuf) |
| 972 | { |
| 973 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 974 | /* The value is right-padded to 8 bytes and then loaded, as |
| 975 | two "words", into r3/r4. */ |
| 976 | gdb_byte regvals[PPC_MAX_REGISTER_SIZE * 2]; |
| 977 | regcache->cooked_read (tdep->ppc_gp0_regnum + 3, |
| 978 | regvals + 0 * tdep->wordsize); |
| 979 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 980 | regcache->cooked_read (tdep->ppc_gp0_regnum + 4, |
| 981 | regvals + 1 * tdep->wordsize); |
| 982 | memcpy (readbuf, regvals, TYPE_LENGTH (type)); |
| 983 | } |
| 984 | if (writebuf) |
| 985 | { |
| 986 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 987 | /* The value is padded out to 8 bytes and then loaded, as |
| 988 | two "words" into r3/r4. */ |
| 989 | gdb_byte regvals[PPC_MAX_REGISTER_SIZE * 2]; |
| 990 | memset (regvals, 0, sizeof regvals); |
| 991 | memcpy (regvals, writebuf, TYPE_LENGTH (type)); |
| 992 | regcache->cooked_write (tdep->ppc_gp0_regnum + 3, |
| 993 | regvals + 0 * tdep->wordsize); |
| 994 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 995 | regcache->cooked_write (tdep->ppc_gp0_regnum + 4, |
| 996 | regvals + 1 * tdep->wordsize); |
| 997 | } |
| 998 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 999 | } |
| 1000 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 1001 | } |
| 1002 | |
| 1003 | enum return_value_convention |
| 1004 | ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct value *function, |
| 1005 | struct type *valtype, struct regcache *regcache, |
| 1006 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1007 | { |
| 1008 | return do_ppc_sysv_return_value (gdbarch, |
| 1009 | function ? value_type (function) : NULL, |
| 1010 | valtype, regcache, readbuf, writebuf, 0); |
| 1011 | } |
| 1012 | |
| 1013 | enum return_value_convention |
| 1014 | ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch, |
| 1015 | struct value *function, |
| 1016 | struct type *valtype, |
| 1017 | struct regcache *regcache, |
| 1018 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1019 | { |
| 1020 | return do_ppc_sysv_return_value (gdbarch, |
| 1021 | function ? value_type (function) : NULL, |
| 1022 | valtype, regcache, readbuf, writebuf, 1); |
| 1023 | } |
| 1024 | |
| 1025 | /* The helper function for 64-bit SYSV push_dummy_call. Converts the |
| 1026 | function's code address back into the function's descriptor |
| 1027 | address. |
| 1028 | |
| 1029 | Find a value for the TOC register. Every symbol should have both |
| 1030 | ".FN" and "FN" in the minimal symbol table. "FN" points at the |
| 1031 | FN's descriptor, while ".FN" points at the entry point (which |
| 1032 | matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the |
| 1033 | FN's descriptor address (while at the same time being careful to |
| 1034 | find "FN" in the same object file as ".FN"). */ |
| 1035 | |
| 1036 | static int |
| 1037 | convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr) |
| 1038 | { |
| 1039 | struct obj_section *dot_fn_section; |
| 1040 | struct bound_minimal_symbol dot_fn; |
| 1041 | struct bound_minimal_symbol fn; |
| 1042 | |
| 1043 | /* Find the minimal symbol that corresponds to CODE_ADDR (should |
| 1044 | have a name of the form ".FN"). */ |
| 1045 | dot_fn = lookup_minimal_symbol_by_pc (code_addr); |
| 1046 | if (dot_fn.minsym == NULL || dot_fn.minsym->linkage_name ()[0] != '.') |
| 1047 | return 0; |
| 1048 | /* Get the section that contains CODE_ADDR. Need this for the |
| 1049 | "objfile" that it contains. */ |
| 1050 | dot_fn_section = find_pc_section (code_addr); |
| 1051 | if (dot_fn_section == NULL || dot_fn_section->objfile == NULL) |
| 1052 | return 0; |
| 1053 | /* Now find the corresponding "FN" (dropping ".") minimal symbol's |
| 1054 | address. Only look for the minimal symbol in ".FN"'s object file |
| 1055 | - avoids problems when two object files (i.e., shared libraries) |
| 1056 | contain a minimal symbol with the same name. */ |
| 1057 | fn = lookup_minimal_symbol (dot_fn.minsym->linkage_name () + 1, NULL, |
| 1058 | dot_fn_section->objfile); |
| 1059 | if (fn.minsym == NULL) |
| 1060 | return 0; |
| 1061 | /* Found a descriptor. */ |
| 1062 | (*desc_addr) = BMSYMBOL_VALUE_ADDRESS (fn); |
| 1063 | return 1; |
| 1064 | } |
| 1065 | |
| 1066 | /* Walk down the type tree of TYPE counting consecutive base elements. |
| 1067 | If *FIELD_TYPE is NULL, then set it to the first valid floating point |
| 1068 | or vector type. If a non-floating point or vector type is found, or |
| 1069 | if a floating point or vector type that doesn't match a non-NULL |
| 1070 | *FIELD_TYPE is found, then return -1, otherwise return the count in the |
| 1071 | sub-tree. */ |
| 1072 | |
| 1073 | static LONGEST |
| 1074 | ppc64_aggregate_candidate (struct type *type, |
| 1075 | struct type **field_type) |
| 1076 | { |
| 1077 | type = check_typedef (type); |
| 1078 | |
| 1079 | switch (TYPE_CODE (type)) |
| 1080 | { |
| 1081 | case TYPE_CODE_FLT: |
| 1082 | case TYPE_CODE_DECFLOAT: |
| 1083 | if (!*field_type) |
| 1084 | *field_type = type; |
| 1085 | if (TYPE_CODE (*field_type) == TYPE_CODE (type) |
| 1086 | && TYPE_LENGTH (*field_type) == TYPE_LENGTH (type)) |
| 1087 | return 1; |
| 1088 | break; |
| 1089 | |
| 1090 | case TYPE_CODE_COMPLEX: |
| 1091 | type = TYPE_TARGET_TYPE (type); |
| 1092 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 1093 | || TYPE_CODE (type) == TYPE_CODE_DECFLOAT) |
| 1094 | { |
| 1095 | if (!*field_type) |
| 1096 | *field_type = type; |
| 1097 | if (TYPE_CODE (*field_type) == TYPE_CODE (type) |
| 1098 | && TYPE_LENGTH (*field_type) == TYPE_LENGTH (type)) |
| 1099 | return 2; |
| 1100 | } |
| 1101 | break; |
| 1102 | |
| 1103 | case TYPE_CODE_ARRAY: |
| 1104 | if (TYPE_VECTOR (type)) |
| 1105 | { |
| 1106 | if (!*field_type) |
| 1107 | *field_type = type; |
| 1108 | if (TYPE_CODE (*field_type) == TYPE_CODE (type) |
| 1109 | && TYPE_LENGTH (*field_type) == TYPE_LENGTH (type)) |
| 1110 | return 1; |
| 1111 | } |
| 1112 | else |
| 1113 | { |
| 1114 | LONGEST count, low_bound, high_bound; |
| 1115 | |
| 1116 | count = ppc64_aggregate_candidate |
| 1117 | (TYPE_TARGET_TYPE (type), field_type); |
| 1118 | if (count == -1) |
| 1119 | return -1; |
| 1120 | |
| 1121 | if (!get_array_bounds (type, &low_bound, &high_bound)) |
| 1122 | return -1; |
| 1123 | count *= high_bound - low_bound; |
| 1124 | |
| 1125 | /* There must be no padding. */ |
| 1126 | if (count == 0) |
| 1127 | return TYPE_LENGTH (type) == 0 ? 0 : -1; |
| 1128 | else if (TYPE_LENGTH (type) != count * TYPE_LENGTH (*field_type)) |
| 1129 | return -1; |
| 1130 | |
| 1131 | return count; |
| 1132 | } |
| 1133 | break; |
| 1134 | |
| 1135 | case TYPE_CODE_STRUCT: |
| 1136 | case TYPE_CODE_UNION: |
| 1137 | { |
| 1138 | LONGEST count = 0; |
| 1139 | int i; |
| 1140 | |
| 1141 | for (i = 0; i < TYPE_NFIELDS (type); i++) |
| 1142 | { |
| 1143 | LONGEST sub_count; |
| 1144 | |
| 1145 | if (field_is_static (&TYPE_FIELD (type, i))) |
| 1146 | continue; |
| 1147 | |
| 1148 | sub_count = ppc64_aggregate_candidate |
| 1149 | (TYPE_FIELD_TYPE (type, i), field_type); |
| 1150 | if (sub_count == -1) |
| 1151 | return -1; |
| 1152 | |
| 1153 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT) |
| 1154 | count += sub_count; |
| 1155 | else |
| 1156 | count = std::max (count, sub_count); |
| 1157 | } |
| 1158 | |
| 1159 | /* There must be no padding. */ |
| 1160 | if (count == 0) |
| 1161 | return TYPE_LENGTH (type) == 0 ? 0 : -1; |
| 1162 | else if (TYPE_LENGTH (type) != count * TYPE_LENGTH (*field_type)) |
| 1163 | return -1; |
| 1164 | |
| 1165 | return count; |
| 1166 | } |
| 1167 | break; |
| 1168 | |
| 1169 | default: |
| 1170 | break; |
| 1171 | } |
| 1172 | |
| 1173 | return -1; |
| 1174 | } |
| 1175 | |
| 1176 | /* If an argument of type TYPE is a homogeneous float or vector aggregate |
| 1177 | that shall be passed in FP/vector registers according to the ELFv2 ABI, |
| 1178 | return the homogeneous element type in *ELT_TYPE and the number of |
| 1179 | elements in *N_ELTS, and return non-zero. Otherwise, return zero. */ |
| 1180 | |
| 1181 | static int |
| 1182 | ppc64_elfv2_abi_homogeneous_aggregate (struct type *type, |
| 1183 | struct type **elt_type, int *n_elts) |
| 1184 | { |
| 1185 | /* Complex types at the top level are treated separately. However, |
| 1186 | complex types can be elements of homogeneous aggregates. */ |
| 1187 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1188 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 1189 | || (TYPE_CODE (type) == TYPE_CODE_ARRAY && !TYPE_VECTOR (type))) |
| 1190 | { |
| 1191 | struct type *field_type = NULL; |
| 1192 | LONGEST field_count = ppc64_aggregate_candidate (type, &field_type); |
| 1193 | |
| 1194 | if (field_count > 0) |
| 1195 | { |
| 1196 | int n_regs = ((TYPE_CODE (field_type) == TYPE_CODE_FLT |
| 1197 | || TYPE_CODE (field_type) == TYPE_CODE_DECFLOAT)? |
| 1198 | (TYPE_LENGTH (field_type) + 7) >> 3 : 1); |
| 1199 | |
| 1200 | /* The ELFv2 ABI allows homogeneous aggregates to occupy |
| 1201 | up to 8 registers. */ |
| 1202 | if (field_count * n_regs <= 8) |
| 1203 | { |
| 1204 | if (elt_type) |
| 1205 | *elt_type = field_type; |
| 1206 | if (n_elts) |
| 1207 | *n_elts = (int) field_count; |
| 1208 | /* Note that field_count is LONGEST since it may hold the size |
| 1209 | of an array, while *n_elts is int since its value is bounded |
| 1210 | by the number of registers used for argument passing. The |
| 1211 | cast cannot overflow due to the bounds checking above. */ |
| 1212 | return 1; |
| 1213 | } |
| 1214 | } |
| 1215 | } |
| 1216 | |
| 1217 | return 0; |
| 1218 | } |
| 1219 | |
| 1220 | /* Structure holding the next argument position. */ |
| 1221 | struct ppc64_sysv_argpos |
| 1222 | { |
| 1223 | /* Register cache holding argument registers. If this is NULL, |
| 1224 | we only simulate argument processing without actually updating |
| 1225 | any registers or memory. */ |
| 1226 | struct regcache *regcache; |
| 1227 | /* Next available general-purpose argument register. */ |
| 1228 | int greg; |
| 1229 | /* Next available floating-point argument register. */ |
| 1230 | int freg; |
| 1231 | /* Next available vector argument register. */ |
| 1232 | int vreg; |
| 1233 | /* The address, at which the next general purpose parameter |
| 1234 | (integer, struct, float, vector, ...) should be saved. */ |
| 1235 | CORE_ADDR gparam; |
| 1236 | /* The address, at which the next by-reference parameter |
| 1237 | (non-Altivec vector, variably-sized type) should be saved. */ |
| 1238 | CORE_ADDR refparam; |
| 1239 | }; |
| 1240 | |
| 1241 | /* VAL is a value of length LEN. Store it into the argument area on the |
| 1242 | stack and load it into the corresponding general-purpose registers |
| 1243 | required by the ABI, and update ARGPOS. |
| 1244 | |
| 1245 | If ALIGN is nonzero, it specifies the minimum alignment required |
| 1246 | for the on-stack copy of the argument. */ |
| 1247 | |
| 1248 | static void |
| 1249 | ppc64_sysv_abi_push_val (struct gdbarch *gdbarch, |
| 1250 | const bfd_byte *val, int len, int align, |
| 1251 | struct ppc64_sysv_argpos *argpos) |
| 1252 | { |
| 1253 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1254 | int offset = 0; |
| 1255 | |
| 1256 | /* Enforce alignment of stack location, if requested. */ |
| 1257 | if (align > tdep->wordsize) |
| 1258 | { |
| 1259 | CORE_ADDR aligned_gparam = align_up (argpos->gparam, align); |
| 1260 | |
| 1261 | argpos->greg += (aligned_gparam - argpos->gparam) / tdep->wordsize; |
| 1262 | argpos->gparam = aligned_gparam; |
| 1263 | } |
| 1264 | |
| 1265 | /* The ABI (version 1.9) specifies that values smaller than one |
| 1266 | doubleword are right-aligned and those larger are left-aligned. |
| 1267 | GCC versions before 3.4 implemented this incorrectly; see |
| 1268 | <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */ |
| 1269 | if (len < tdep->wordsize |
| 1270 | && gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1271 | offset = tdep->wordsize - len; |
| 1272 | |
| 1273 | if (argpos->regcache) |
| 1274 | write_memory (argpos->gparam + offset, val, len); |
| 1275 | argpos->gparam = align_up (argpos->gparam + len, tdep->wordsize); |
| 1276 | |
| 1277 | while (len >= tdep->wordsize) |
| 1278 | { |
| 1279 | if (argpos->regcache && argpos->greg <= 10) |
| 1280 | argpos->regcache->cooked_write (tdep->ppc_gp0_regnum + argpos->greg, |
| 1281 | val); |
| 1282 | argpos->greg++; |
| 1283 | len -= tdep->wordsize; |
| 1284 | val += tdep->wordsize; |
| 1285 | } |
| 1286 | |
| 1287 | if (len > 0) |
| 1288 | { |
| 1289 | if (argpos->regcache && argpos->greg <= 10) |
| 1290 | argpos->regcache->cooked_write_part |
| 1291 | (tdep->ppc_gp0_regnum + argpos->greg, offset, len, val); |
| 1292 | argpos->greg++; |
| 1293 | } |
| 1294 | } |
| 1295 | |
| 1296 | /* The same as ppc64_sysv_abi_push_val, but using a single-word integer |
| 1297 | value VAL as argument. */ |
| 1298 | |
| 1299 | static void |
| 1300 | ppc64_sysv_abi_push_integer (struct gdbarch *gdbarch, ULONGEST val, |
| 1301 | struct ppc64_sysv_argpos *argpos) |
| 1302 | { |
| 1303 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1304 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1305 | gdb_byte buf[PPC_MAX_REGISTER_SIZE]; |
| 1306 | |
| 1307 | if (argpos->regcache) |
| 1308 | store_unsigned_integer (buf, tdep->wordsize, byte_order, val); |
| 1309 | ppc64_sysv_abi_push_val (gdbarch, buf, tdep->wordsize, 0, argpos); |
| 1310 | } |
| 1311 | |
| 1312 | /* VAL is a value of TYPE, a (binary or decimal) floating-point type. |
| 1313 | Load it into a floating-point register if required by the ABI, |
| 1314 | and update ARGPOS. */ |
| 1315 | |
| 1316 | static void |
| 1317 | ppc64_sysv_abi_push_freg (struct gdbarch *gdbarch, |
| 1318 | struct type *type, const bfd_byte *val, |
| 1319 | struct ppc64_sysv_argpos *argpos) |
| 1320 | { |
| 1321 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1322 | if (tdep->soft_float) |
| 1323 | return; |
| 1324 | |
| 1325 | if (TYPE_LENGTH (type) <= 8 |
| 1326 | && TYPE_CODE (type) == TYPE_CODE_FLT) |
| 1327 | { |
| 1328 | /* Floats and doubles go in f1 .. f13. 32-bit floats are converted |
| 1329 | to double first. */ |
| 1330 | if (argpos->regcache && argpos->freg <= 13) |
| 1331 | { |
| 1332 | int regnum = tdep->ppc_fp0_regnum + argpos->freg; |
| 1333 | struct type *regtype = register_type (gdbarch, regnum); |
| 1334 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 1335 | |
| 1336 | target_float_convert (val, type, regval, regtype); |
| 1337 | argpos->regcache->cooked_write (regnum, regval); |
| 1338 | } |
| 1339 | |
| 1340 | argpos->freg++; |
| 1341 | } |
| 1342 | else if (TYPE_LENGTH (type) <= 8 |
| 1343 | && TYPE_CODE (type) == TYPE_CODE_DECFLOAT) |
| 1344 | { |
| 1345 | /* Floats and doubles go in f1 .. f13. 32-bit decimal floats are |
| 1346 | placed in the least significant word. */ |
| 1347 | if (argpos->regcache && argpos->freg <= 13) |
| 1348 | { |
| 1349 | int regnum = tdep->ppc_fp0_regnum + argpos->freg; |
| 1350 | int offset = 0; |
| 1351 | |
| 1352 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1353 | offset = 8 - TYPE_LENGTH (type); |
| 1354 | |
| 1355 | argpos->regcache->cooked_write_part (regnum, offset, |
| 1356 | TYPE_LENGTH (type), val); |
| 1357 | } |
| 1358 | |
| 1359 | argpos->freg++; |
| 1360 | } |
| 1361 | else if (TYPE_LENGTH (type) == 16 |
| 1362 | && TYPE_CODE (type) == TYPE_CODE_FLT |
| 1363 | && (gdbarch_long_double_format (gdbarch) |
| 1364 | == floatformats_ibm_long_double)) |
| 1365 | { |
| 1366 | /* IBM long double stored in two consecutive FPRs. */ |
| 1367 | if (argpos->regcache && argpos->freg <= 13) |
| 1368 | { |
| 1369 | int regnum = tdep->ppc_fp0_regnum + argpos->freg; |
| 1370 | |
| 1371 | argpos->regcache->cooked_write (regnum, val); |
| 1372 | if (argpos->freg <= 12) |
| 1373 | argpos->regcache->cooked_write (regnum + 1, val + 8); |
| 1374 | } |
| 1375 | |
| 1376 | argpos->freg += 2; |
| 1377 | } |
| 1378 | else if (TYPE_LENGTH (type) == 16 |
| 1379 | && TYPE_CODE (type) == TYPE_CODE_DECFLOAT) |
| 1380 | { |
| 1381 | /* 128-bit decimal floating-point values are stored in and even/odd |
| 1382 | pair of FPRs, with the even FPR holding the most significant half. */ |
| 1383 | argpos->freg += argpos->freg & 1; |
| 1384 | |
| 1385 | if (argpos->regcache && argpos->freg <= 12) |
| 1386 | { |
| 1387 | int regnum = tdep->ppc_fp0_regnum + argpos->freg; |
| 1388 | int lopart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 8 : 0; |
| 1389 | int hipart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 0 : 8; |
| 1390 | |
| 1391 | argpos->regcache->cooked_write (regnum, val + hipart); |
| 1392 | argpos->regcache->cooked_write (regnum + 1, val + lopart); |
| 1393 | } |
| 1394 | |
| 1395 | argpos->freg += 2; |
| 1396 | } |
| 1397 | } |
| 1398 | |
| 1399 | /* VAL is a value of AltiVec vector type. Load it into a vector register |
| 1400 | if required by the ABI, and update ARGPOS. */ |
| 1401 | |
| 1402 | static void |
| 1403 | ppc64_sysv_abi_push_vreg (struct gdbarch *gdbarch, const bfd_byte *val, |
| 1404 | struct ppc64_sysv_argpos *argpos) |
| 1405 | { |
| 1406 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1407 | |
| 1408 | if (argpos->regcache && argpos->vreg <= 13) |
| 1409 | argpos->regcache->cooked_write (tdep->ppc_vr0_regnum + argpos->vreg, val); |
| 1410 | |
| 1411 | argpos->vreg++; |
| 1412 | } |
| 1413 | |
| 1414 | /* VAL is a value of TYPE. Load it into memory and/or registers |
| 1415 | as required by the ABI, and update ARGPOS. */ |
| 1416 | |
| 1417 | static void |
| 1418 | ppc64_sysv_abi_push_param (struct gdbarch *gdbarch, |
| 1419 | struct type *type, const bfd_byte *val, |
| 1420 | struct ppc64_sysv_argpos *argpos) |
| 1421 | { |
| 1422 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1423 | |
| 1424 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 1425 | || TYPE_CODE (type) == TYPE_CODE_DECFLOAT) |
| 1426 | { |
| 1427 | /* Floating-point scalars are passed in floating-point registers. */ |
| 1428 | ppc64_sysv_abi_push_val (gdbarch, val, TYPE_LENGTH (type), 0, argpos); |
| 1429 | ppc64_sysv_abi_push_freg (gdbarch, type, val, argpos); |
| 1430 | } |
| 1431 | else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type) |
| 1432 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC |
| 1433 | && TYPE_LENGTH (type) == 16) |
| 1434 | { |
| 1435 | /* AltiVec vectors are passed aligned, and in vector registers. */ |
| 1436 | ppc64_sysv_abi_push_val (gdbarch, val, TYPE_LENGTH (type), 16, argpos); |
| 1437 | ppc64_sysv_abi_push_vreg (gdbarch, val, argpos); |
| 1438 | } |
| 1439 | else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type) |
| 1440 | && TYPE_LENGTH (type) >= 16) |
| 1441 | { |
| 1442 | /* Non-Altivec vectors are passed by reference. */ |
| 1443 | |
| 1444 | /* Copy value onto the stack ... */ |
| 1445 | CORE_ADDR addr = align_up (argpos->refparam, 16); |
| 1446 | if (argpos->regcache) |
| 1447 | write_memory (addr, val, TYPE_LENGTH (type)); |
| 1448 | argpos->refparam = align_up (addr + TYPE_LENGTH (type), tdep->wordsize); |
| 1449 | |
| 1450 | /* ... and pass a pointer to the copy as parameter. */ |
| 1451 | ppc64_sysv_abi_push_integer (gdbarch, addr, argpos); |
| 1452 | } |
| 1453 | else if ((TYPE_CODE (type) == TYPE_CODE_INT |
| 1454 | || TYPE_CODE (type) == TYPE_CODE_ENUM |
| 1455 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 1456 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 1457 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 1458 | || TYPE_IS_REFERENCE (type)) |
| 1459 | && TYPE_LENGTH (type) <= tdep->wordsize) |
| 1460 | { |
| 1461 | ULONGEST word = 0; |
| 1462 | |
| 1463 | if (argpos->regcache) |
| 1464 | { |
| 1465 | /* Sign extend the value, then store it unsigned. */ |
| 1466 | word = unpack_long (type, val); |
| 1467 | |
| 1468 | /* Convert any function code addresses into descriptors. */ |
| 1469 | if (tdep->elf_abi == POWERPC_ELF_V1 |
| 1470 | && (TYPE_CODE (type) == TYPE_CODE_PTR |
| 1471 | || TYPE_CODE (type) == TYPE_CODE_REF)) |
| 1472 | { |
| 1473 | struct type *target_type |
| 1474 | = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1475 | |
| 1476 | if (TYPE_CODE (target_type) == TYPE_CODE_FUNC |
| 1477 | || TYPE_CODE (target_type) == TYPE_CODE_METHOD) |
| 1478 | { |
| 1479 | CORE_ADDR desc = word; |
| 1480 | |
| 1481 | convert_code_addr_to_desc_addr (word, &desc); |
| 1482 | word = desc; |
| 1483 | } |
| 1484 | } |
| 1485 | } |
| 1486 | |
| 1487 | ppc64_sysv_abi_push_integer (gdbarch, word, argpos); |
| 1488 | } |
| 1489 | else |
| 1490 | { |
| 1491 | ppc64_sysv_abi_push_val (gdbarch, val, TYPE_LENGTH (type), 0, argpos); |
| 1492 | |
| 1493 | /* The ABI (version 1.9) specifies that structs containing a |
| 1494 | single floating-point value, at any level of nesting of |
| 1495 | single-member structs, are passed in floating-point registers. */ |
| 1496 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1497 | && TYPE_NFIELDS (type) == 1) |
| 1498 | { |
| 1499 | while (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1500 | && TYPE_NFIELDS (type) == 1) |
| 1501 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); |
| 1502 | |
| 1503 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 1504 | ppc64_sysv_abi_push_freg (gdbarch, type, val, argpos); |
| 1505 | } |
| 1506 | |
| 1507 | /* In the ELFv2 ABI, homogeneous floating-point or vector |
| 1508 | aggregates are passed in a series of registers. */ |
| 1509 | if (tdep->elf_abi == POWERPC_ELF_V2) |
| 1510 | { |
| 1511 | struct type *eltype; |
| 1512 | int i, nelt; |
| 1513 | |
| 1514 | if (ppc64_elfv2_abi_homogeneous_aggregate (type, &eltype, &nelt)) |
| 1515 | for (i = 0; i < nelt; i++) |
| 1516 | { |
| 1517 | const gdb_byte *elval = val + i * TYPE_LENGTH (eltype); |
| 1518 | |
| 1519 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT |
| 1520 | || TYPE_CODE (eltype) == TYPE_CODE_DECFLOAT) |
| 1521 | ppc64_sysv_abi_push_freg (gdbarch, eltype, elval, argpos); |
| 1522 | else if (TYPE_CODE (eltype) == TYPE_CODE_ARRAY |
| 1523 | && TYPE_VECTOR (eltype) |
| 1524 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC |
| 1525 | && TYPE_LENGTH (eltype) == 16) |
| 1526 | ppc64_sysv_abi_push_vreg (gdbarch, elval, argpos); |
| 1527 | } |
| 1528 | } |
| 1529 | } |
| 1530 | } |
| 1531 | |
| 1532 | /* Pass the arguments in either registers, or in the stack. Using the |
| 1533 | ppc 64 bit SysV ABI. |
| 1534 | |
| 1535 | This implements a dumbed down version of the ABI. It always writes |
| 1536 | values to memory, GPR and FPR, even when not necessary. Doing this |
| 1537 | greatly simplifies the logic. */ |
| 1538 | |
| 1539 | CORE_ADDR |
| 1540 | ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, |
| 1541 | struct value *function, |
| 1542 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 1543 | int nargs, struct value **args, CORE_ADDR sp, |
| 1544 | function_call_return_method return_method, |
| 1545 | CORE_ADDR struct_addr) |
| 1546 | { |
| 1547 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 1548 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1549 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1550 | int opencl_abi = ppc_sysv_use_opencl_abi (value_type (function)); |
| 1551 | ULONGEST back_chain; |
| 1552 | /* See for-loop comment below. */ |
| 1553 | int write_pass; |
| 1554 | /* Size of the by-reference parameter copy region, the final value is |
| 1555 | computed in the for-loop below. */ |
| 1556 | LONGEST refparam_size = 0; |
| 1557 | /* Size of the general parameter region, the final value is computed |
| 1558 | in the for-loop below. */ |
| 1559 | LONGEST gparam_size = 0; |
| 1560 | /* Kevin writes ... I don't mind seeing tdep->wordsize used in the |
| 1561 | calls to align_up(), align_down(), etc. because this makes it |
| 1562 | easier to reuse this code (in a copy/paste sense) in the future, |
| 1563 | but it is a 64-bit ABI and asserting that the wordsize is 8 bytes |
| 1564 | at some point makes it easier to verify that this function is |
| 1565 | correct without having to do a non-local analysis to figure out |
| 1566 | the possible values of tdep->wordsize. */ |
| 1567 | gdb_assert (tdep->wordsize == 8); |
| 1568 | |
| 1569 | /* This function exists to support a calling convention that |
| 1570 | requires floating-point registers. It shouldn't be used on |
| 1571 | processors that lack them. */ |
| 1572 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 1573 | |
| 1574 | /* By this stage in the proceedings, SP has been decremented by "red |
| 1575 | zone size" + "struct return size". Fetch the stack-pointer from |
| 1576 | before this and use that as the BACK_CHAIN. */ |
| 1577 | regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch), |
| 1578 | &back_chain); |
| 1579 | |
| 1580 | /* Go through the argument list twice. |
| 1581 | |
| 1582 | Pass 1: Compute the function call's stack space and register |
| 1583 | requirements. |
| 1584 | |
| 1585 | Pass 2: Replay the same computation but this time also write the |
| 1586 | values out to the target. */ |
| 1587 | |
| 1588 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 1589 | { |
| 1590 | int argno; |
| 1591 | |
| 1592 | struct ppc64_sysv_argpos argpos; |
| 1593 | argpos.greg = 3; |
| 1594 | argpos.freg = 1; |
| 1595 | argpos.vreg = 2; |
| 1596 | |
| 1597 | if (!write_pass) |
| 1598 | { |
| 1599 | /* During the first pass, GPARAM and REFPARAM are more like |
| 1600 | offsets (start address zero) than addresses. That way |
| 1601 | they accumulate the total stack space each region |
| 1602 | requires. */ |
| 1603 | argpos.regcache = NULL; |
| 1604 | argpos.gparam = 0; |
| 1605 | argpos.refparam = 0; |
| 1606 | } |
| 1607 | else |
| 1608 | { |
| 1609 | /* Decrement the stack pointer making space for the Altivec |
| 1610 | and general on-stack parameters. Set refparam and gparam |
| 1611 | to their corresponding regions. */ |
| 1612 | argpos.regcache = regcache; |
| 1613 | argpos.refparam = align_down (sp - refparam_size, 16); |
| 1614 | argpos.gparam = align_down (argpos.refparam - gparam_size, 16); |
| 1615 | /* Add in space for the TOC, link editor double word (v1 only), |
| 1616 | compiler double word (v1 only), LR save area, CR save area, |
| 1617 | and backchain. */ |
| 1618 | if (tdep->elf_abi == POWERPC_ELF_V1) |
| 1619 | sp = align_down (argpos.gparam - 48, 16); |
| 1620 | else |
| 1621 | sp = align_down (argpos.gparam - 32, 16); |
| 1622 | } |
| 1623 | |
| 1624 | /* If the function is returning a `struct', then there is an |
| 1625 | extra hidden parameter (which will be passed in r3) |
| 1626 | containing the address of that struct.. In that case we |
| 1627 | should advance one word and start from r4 register to copy |
| 1628 | parameters. This also consumes one on-stack parameter slot. */ |
| 1629 | if (return_method == return_method_struct) |
| 1630 | ppc64_sysv_abi_push_integer (gdbarch, struct_addr, &argpos); |
| 1631 | |
| 1632 | for (argno = 0; argno < nargs; argno++) |
| 1633 | { |
| 1634 | struct value *arg = args[argno]; |
| 1635 | struct type *type = check_typedef (value_type (arg)); |
| 1636 | const bfd_byte *val = value_contents (arg); |
| 1637 | |
| 1638 | if (TYPE_CODE (type) == TYPE_CODE_COMPLEX) |
| 1639 | { |
| 1640 | /* Complex types are passed as if two independent scalars. */ |
| 1641 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1642 | |
| 1643 | ppc64_sysv_abi_push_param (gdbarch, eltype, val, &argpos); |
| 1644 | ppc64_sysv_abi_push_param (gdbarch, eltype, |
| 1645 | val + TYPE_LENGTH (eltype), &argpos); |
| 1646 | } |
| 1647 | else if (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type) |
| 1648 | && opencl_abi) |
| 1649 | { |
| 1650 | /* OpenCL vectors shorter than 16 bytes are passed as if |
| 1651 | a series of independent scalars; OpenCL vectors 16 bytes |
| 1652 | or longer are passed as if a series of AltiVec vectors. */ |
| 1653 | struct type *eltype; |
| 1654 | int i, nelt; |
| 1655 | |
| 1656 | if (TYPE_LENGTH (type) < 16) |
| 1657 | eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1658 | else |
| 1659 | eltype = register_type (gdbarch, tdep->ppc_vr0_regnum); |
| 1660 | |
| 1661 | nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 1662 | for (i = 0; i < nelt; i++) |
| 1663 | { |
| 1664 | const gdb_byte *elval = val + i * TYPE_LENGTH (eltype); |
| 1665 | |
| 1666 | ppc64_sysv_abi_push_param (gdbarch, eltype, elval, &argpos); |
| 1667 | } |
| 1668 | } |
| 1669 | else |
| 1670 | { |
| 1671 | /* All other types are passed as single arguments. */ |
| 1672 | ppc64_sysv_abi_push_param (gdbarch, type, val, &argpos); |
| 1673 | } |
| 1674 | } |
| 1675 | |
| 1676 | if (!write_pass) |
| 1677 | { |
| 1678 | /* Save the true region sizes ready for the second pass. */ |
| 1679 | refparam_size = argpos.refparam; |
| 1680 | /* Make certain that the general parameter save area is at |
| 1681 | least the minimum 8 registers (or doublewords) in size. */ |
| 1682 | if (argpos.greg < 8) |
| 1683 | gparam_size = 8 * tdep->wordsize; |
| 1684 | else |
| 1685 | gparam_size = argpos.gparam; |
| 1686 | } |
| 1687 | } |
| 1688 | |
| 1689 | /* Update %sp. */ |
| 1690 | regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp); |
| 1691 | |
| 1692 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 1693 | write_memory_signed_integer (sp, tdep->wordsize, byte_order, back_chain); |
| 1694 | |
| 1695 | /* Point the inferior function call's return address at the dummy's |
| 1696 | breakpoint. */ |
| 1697 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 1698 | |
| 1699 | /* In the ELFv1 ABI, use the func_addr to find the descriptor, and use |
| 1700 | that to find the TOC. If we're calling via a function pointer, |
| 1701 | the pointer itself identifies the descriptor. */ |
| 1702 | if (tdep->elf_abi == POWERPC_ELF_V1) |
| 1703 | { |
| 1704 | struct type *ftype = check_typedef (value_type (function)); |
| 1705 | CORE_ADDR desc_addr = value_as_address (function); |
| 1706 | |
| 1707 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR |
| 1708 | || convert_code_addr_to_desc_addr (func_addr, &desc_addr)) |
| 1709 | { |
| 1710 | /* The TOC is the second double word in the descriptor. */ |
| 1711 | CORE_ADDR toc = |
| 1712 | read_memory_unsigned_integer (desc_addr + tdep->wordsize, |
| 1713 | tdep->wordsize, byte_order); |
| 1714 | |
| 1715 | regcache_cooked_write_unsigned (regcache, |
| 1716 | tdep->ppc_gp0_regnum + 2, toc); |
| 1717 | } |
| 1718 | } |
| 1719 | |
| 1720 | /* In the ELFv2 ABI, we need to pass the target address in r12 since |
| 1721 | we may be calling a global entry point. */ |
| 1722 | if (tdep->elf_abi == POWERPC_ELF_V2) |
| 1723 | regcache_cooked_write_unsigned (regcache, |
| 1724 | tdep->ppc_gp0_regnum + 12, func_addr); |
| 1725 | |
| 1726 | return sp; |
| 1727 | } |
| 1728 | |
| 1729 | /* Subroutine of ppc64_sysv_abi_return_value that handles "base" types: |
| 1730 | integer, floating-point, and AltiVec vector types. |
| 1731 | |
| 1732 | This routine also handles components of aggregate return types; |
| 1733 | INDEX describes which part of the aggregate is to be handled. |
| 1734 | |
| 1735 | Returns true if VALTYPE is some such base type that could be handled, |
| 1736 | false otherwise. */ |
| 1737 | static int |
| 1738 | ppc64_sysv_abi_return_value_base (struct gdbarch *gdbarch, struct type *valtype, |
| 1739 | struct regcache *regcache, gdb_byte *readbuf, |
| 1740 | const gdb_byte *writebuf, int index) |
| 1741 | { |
| 1742 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1743 | |
| 1744 | /* Integers live in GPRs starting at r3. */ |
| 1745 | if ((TYPE_CODE (valtype) == TYPE_CODE_INT |
| 1746 | || TYPE_CODE (valtype) == TYPE_CODE_ENUM |
| 1747 | || TYPE_CODE (valtype) == TYPE_CODE_CHAR |
| 1748 | || TYPE_CODE (valtype) == TYPE_CODE_BOOL) |
| 1749 | && TYPE_LENGTH (valtype) <= 8) |
| 1750 | { |
| 1751 | int regnum = tdep->ppc_gp0_regnum + 3 + index; |
| 1752 | |
| 1753 | if (writebuf != NULL) |
| 1754 | { |
| 1755 | /* Be careful to sign extend the value. */ |
| 1756 | regcache_cooked_write_unsigned (regcache, regnum, |
| 1757 | unpack_long (valtype, writebuf)); |
| 1758 | } |
| 1759 | if (readbuf != NULL) |
| 1760 | { |
| 1761 | /* Extract the integer from GPR. Since this is truncating the |
| 1762 | value, there isn't a sign extension problem. */ |
| 1763 | ULONGEST regval; |
| 1764 | |
| 1765 | regcache_cooked_read_unsigned (regcache, regnum, ®val); |
| 1766 | store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), |
| 1767 | gdbarch_byte_order (gdbarch), regval); |
| 1768 | } |
| 1769 | return 1; |
| 1770 | } |
| 1771 | |
| 1772 | /* Floats and doubles go in f1 .. f13. 32-bit floats are converted |
| 1773 | to double first. */ |
| 1774 | if (TYPE_LENGTH (valtype) <= 8 |
| 1775 | && TYPE_CODE (valtype) == TYPE_CODE_FLT) |
| 1776 | { |
| 1777 | int regnum = tdep->ppc_fp0_regnum + 1 + index; |
| 1778 | struct type *regtype = register_type (gdbarch, regnum); |
| 1779 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 1780 | |
| 1781 | if (writebuf != NULL) |
| 1782 | { |
| 1783 | target_float_convert (writebuf, valtype, regval, regtype); |
| 1784 | regcache->cooked_write (regnum, regval); |
| 1785 | } |
| 1786 | if (readbuf != NULL) |
| 1787 | { |
| 1788 | regcache->cooked_read (regnum, regval); |
| 1789 | target_float_convert (regval, regtype, readbuf, valtype); |
| 1790 | } |
| 1791 | return 1; |
| 1792 | } |
| 1793 | |
| 1794 | /* Floats and doubles go in f1 .. f13. 32-bit decimal floats are |
| 1795 | placed in the least significant word. */ |
| 1796 | if (TYPE_LENGTH (valtype) <= 8 |
| 1797 | && TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT) |
| 1798 | { |
| 1799 | int regnum = tdep->ppc_fp0_regnum + 1 + index; |
| 1800 | int offset = 0; |
| 1801 | |
| 1802 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1803 | offset = 8 - TYPE_LENGTH (valtype); |
| 1804 | |
| 1805 | if (writebuf != NULL) |
| 1806 | regcache->cooked_write_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1807 | writebuf); |
| 1808 | if (readbuf != NULL) |
| 1809 | regcache->cooked_read_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1810 | readbuf); |
| 1811 | return 1; |
| 1812 | } |
| 1813 | |
| 1814 | /* IBM long double stored in two consecutive FPRs. */ |
| 1815 | if (TYPE_LENGTH (valtype) == 16 |
| 1816 | && TYPE_CODE (valtype) == TYPE_CODE_FLT |
| 1817 | && (gdbarch_long_double_format (gdbarch) |
| 1818 | == floatformats_ibm_long_double)) |
| 1819 | { |
| 1820 | int regnum = tdep->ppc_fp0_regnum + 1 + 2 * index; |
| 1821 | |
| 1822 | if (writebuf != NULL) |
| 1823 | { |
| 1824 | regcache->cooked_write (regnum, writebuf); |
| 1825 | regcache->cooked_write (regnum + 1, writebuf + 8); |
| 1826 | } |
| 1827 | if (readbuf != NULL) |
| 1828 | { |
| 1829 | regcache->cooked_read (regnum, readbuf); |
| 1830 | regcache->cooked_read (regnum + 1, readbuf + 8); |
| 1831 | } |
| 1832 | return 1; |
| 1833 | } |
| 1834 | |
| 1835 | /* 128-bit decimal floating-point values are stored in an even/odd |
| 1836 | pair of FPRs, with the even FPR holding the most significant half. */ |
| 1837 | if (TYPE_LENGTH (valtype) == 16 |
| 1838 | && TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT) |
| 1839 | { |
| 1840 | int regnum = tdep->ppc_fp0_regnum + 2 + 2 * index; |
| 1841 | int lopart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 8 : 0; |
| 1842 | int hipart = gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG ? 0 : 8; |
| 1843 | |
| 1844 | if (writebuf != NULL) |
| 1845 | { |
| 1846 | regcache->cooked_write (regnum, writebuf + hipart); |
| 1847 | regcache->cooked_write (regnum + 1, writebuf + lopart); |
| 1848 | } |
| 1849 | if (readbuf != NULL) |
| 1850 | { |
| 1851 | regcache->cooked_read (regnum, readbuf + hipart); |
| 1852 | regcache->cooked_read (regnum + 1, readbuf + lopart); |
| 1853 | } |
| 1854 | return 1; |
| 1855 | } |
| 1856 | |
| 1857 | /* AltiVec vectors are returned in VRs starting at v2. */ |
| 1858 | if (TYPE_LENGTH (valtype) == 16 |
| 1859 | && TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype) |
| 1860 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 1861 | { |
| 1862 | int regnum = tdep->ppc_vr0_regnum + 2 + index; |
| 1863 | |
| 1864 | if (writebuf != NULL) |
| 1865 | regcache->cooked_write (regnum, writebuf); |
| 1866 | if (readbuf != NULL) |
| 1867 | regcache->cooked_read (regnum, readbuf); |
| 1868 | return 1; |
| 1869 | } |
| 1870 | |
| 1871 | /* Short vectors are returned in GPRs starting at r3. */ |
| 1872 | if (TYPE_LENGTH (valtype) <= 8 |
| 1873 | && TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype)) |
| 1874 | { |
| 1875 | int regnum = tdep->ppc_gp0_regnum + 3 + index; |
| 1876 | int offset = 0; |
| 1877 | |
| 1878 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1879 | offset = 8 - TYPE_LENGTH (valtype); |
| 1880 | |
| 1881 | if (writebuf != NULL) |
| 1882 | regcache->cooked_write_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1883 | writebuf); |
| 1884 | if (readbuf != NULL) |
| 1885 | regcache->cooked_read_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1886 | readbuf); |
| 1887 | return 1; |
| 1888 | } |
| 1889 | |
| 1890 | return 0; |
| 1891 | } |
| 1892 | |
| 1893 | /* The 64 bit ABI return value convention. |
| 1894 | |
| 1895 | Return non-zero if the return-value is stored in a register, return |
| 1896 | 0 if the return-value is instead stored on the stack (a.k.a., |
| 1897 | struct return convention). |
| 1898 | |
| 1899 | For a return-value stored in a register: when WRITEBUF is non-NULL, |
| 1900 | copy the buffer to the corresponding register return-value location |
| 1901 | location; when READBUF is non-NULL, fill the buffer from the |
| 1902 | corresponding register return-value location. */ |
| 1903 | enum return_value_convention |
| 1904 | ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct value *function, |
| 1905 | struct type *valtype, struct regcache *regcache, |
| 1906 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1907 | { |
| 1908 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1909 | struct type *func_type = function ? value_type (function) : NULL; |
| 1910 | int opencl_abi = func_type? ppc_sysv_use_opencl_abi (func_type) : 0; |
| 1911 | struct type *eltype; |
| 1912 | int nelt, ok; |
| 1913 | |
| 1914 | /* This function exists to support a calling convention that |
| 1915 | requires floating-point registers. It shouldn't be used on |
| 1916 | processors that lack them. */ |
| 1917 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 1918 | |
| 1919 | /* Complex types are returned as if two independent scalars. */ |
| 1920 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX) |
| 1921 | { |
| 1922 | eltype = check_typedef (TYPE_TARGET_TYPE (valtype)); |
| 1923 | |
| 1924 | for (int i = 0; i < 2; i++) |
| 1925 | { |
| 1926 | ok = ppc64_sysv_abi_return_value_base (gdbarch, eltype, regcache, |
| 1927 | readbuf, writebuf, i); |
| 1928 | gdb_assert (ok); |
| 1929 | |
| 1930 | if (readbuf) |
| 1931 | readbuf += TYPE_LENGTH (eltype); |
| 1932 | if (writebuf) |
| 1933 | writebuf += TYPE_LENGTH (eltype); |
| 1934 | } |
| 1935 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1936 | } |
| 1937 | |
| 1938 | /* OpenCL vectors shorter than 16 bytes are returned as if |
| 1939 | a series of independent scalars; OpenCL vectors 16 bytes |
| 1940 | or longer are returned as if a series of AltiVec vectors. */ |
| 1941 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY && TYPE_VECTOR (valtype) |
| 1942 | && opencl_abi) |
| 1943 | { |
| 1944 | if (TYPE_LENGTH (valtype) < 16) |
| 1945 | eltype = check_typedef (TYPE_TARGET_TYPE (valtype)); |
| 1946 | else |
| 1947 | eltype = register_type (gdbarch, tdep->ppc_vr0_regnum); |
| 1948 | |
| 1949 | nelt = TYPE_LENGTH (valtype) / TYPE_LENGTH (eltype); |
| 1950 | for (int i = 0; i < nelt; i++) |
| 1951 | { |
| 1952 | ok = ppc64_sysv_abi_return_value_base (gdbarch, eltype, regcache, |
| 1953 | readbuf, writebuf, i); |
| 1954 | gdb_assert (ok); |
| 1955 | |
| 1956 | if (readbuf) |
| 1957 | readbuf += TYPE_LENGTH (eltype); |
| 1958 | if (writebuf) |
| 1959 | writebuf += TYPE_LENGTH (eltype); |
| 1960 | } |
| 1961 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1962 | } |
| 1963 | |
| 1964 | /* All pointers live in r3. */ |
| 1965 | if (TYPE_CODE (valtype) == TYPE_CODE_PTR || TYPE_IS_REFERENCE (valtype)) |
| 1966 | { |
| 1967 | int regnum = tdep->ppc_gp0_regnum + 3; |
| 1968 | |
| 1969 | if (writebuf != NULL) |
| 1970 | regcache->cooked_write (regnum, writebuf); |
| 1971 | if (readbuf != NULL) |
| 1972 | regcache->cooked_read (regnum, readbuf); |
| 1973 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1974 | } |
| 1975 | |
| 1976 | /* Small character arrays are returned, right justified, in r3. */ |
| 1977 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 1978 | && !TYPE_VECTOR (valtype) |
| 1979 | && TYPE_LENGTH (valtype) <= 8 |
| 1980 | && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT |
| 1981 | && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1) |
| 1982 | { |
| 1983 | int regnum = tdep->ppc_gp0_regnum + 3; |
| 1984 | int offset = (register_size (gdbarch, regnum) - TYPE_LENGTH (valtype)); |
| 1985 | |
| 1986 | if (writebuf != NULL) |
| 1987 | regcache->cooked_write_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1988 | writebuf); |
| 1989 | if (readbuf != NULL) |
| 1990 | regcache->cooked_read_part (regnum, offset, TYPE_LENGTH (valtype), |
| 1991 | readbuf); |
| 1992 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1993 | } |
| 1994 | |
| 1995 | /* In the ELFv2 ABI, homogeneous floating-point or vector |
| 1996 | aggregates are returned in registers. */ |
| 1997 | if (tdep->elf_abi == POWERPC_ELF_V2 |
| 1998 | && ppc64_elfv2_abi_homogeneous_aggregate (valtype, &eltype, &nelt) |
| 1999 | && (TYPE_CODE (eltype) == TYPE_CODE_FLT |
| 2000 | || TYPE_CODE (eltype) == TYPE_CODE_DECFLOAT |
| 2001 | || (TYPE_CODE (eltype) == TYPE_CODE_ARRAY |
| 2002 | && TYPE_VECTOR (eltype) |
| 2003 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC |
| 2004 | && TYPE_LENGTH (eltype) == 16))) |
| 2005 | { |
| 2006 | for (int i = 0; i < nelt; i++) |
| 2007 | { |
| 2008 | ok = ppc64_sysv_abi_return_value_base (gdbarch, eltype, regcache, |
| 2009 | readbuf, writebuf, i); |
| 2010 | gdb_assert (ok); |
| 2011 | |
| 2012 | if (readbuf) |
| 2013 | readbuf += TYPE_LENGTH (eltype); |
| 2014 | if (writebuf) |
| 2015 | writebuf += TYPE_LENGTH (eltype); |
| 2016 | } |
| 2017 | |
| 2018 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 2019 | } |
| 2020 | |
| 2021 | /* In the ELFv2 ABI, aggregate types of up to 16 bytes are |
| 2022 | returned in registers r3:r4. */ |
| 2023 | if (tdep->elf_abi == POWERPC_ELF_V2 |
| 2024 | && TYPE_LENGTH (valtype) <= 16 |
| 2025 | && (TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
| 2026 | || TYPE_CODE (valtype) == TYPE_CODE_UNION |
| 2027 | || (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 2028 | && !TYPE_VECTOR (valtype)))) |
| 2029 | { |
| 2030 | int n_regs = ((TYPE_LENGTH (valtype) + tdep->wordsize - 1) |
| 2031 | / tdep->wordsize); |
| 2032 | |
| 2033 | for (int i = 0; i < n_regs; i++) |
| 2034 | { |
| 2035 | gdb_byte regval[PPC_MAX_REGISTER_SIZE]; |
| 2036 | int regnum = tdep->ppc_gp0_regnum + 3 + i; |
| 2037 | int offset = i * tdep->wordsize; |
| 2038 | int len = TYPE_LENGTH (valtype) - offset; |
| 2039 | |
| 2040 | if (len > tdep->wordsize) |
| 2041 | len = tdep->wordsize; |
| 2042 | |
| 2043 | if (writebuf != NULL) |
| 2044 | { |
| 2045 | memset (regval, 0, sizeof regval); |
| 2046 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG |
| 2047 | && offset == 0) |
| 2048 | memcpy (regval + tdep->wordsize - len, writebuf, len); |
| 2049 | else |
| 2050 | memcpy (regval, writebuf + offset, len); |
| 2051 | regcache->cooked_write (regnum, regval); |
| 2052 | } |
| 2053 | if (readbuf != NULL) |
| 2054 | { |
| 2055 | regcache->cooked_read (regnum, regval); |
| 2056 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG |
| 2057 | && offset == 0) |
| 2058 | memcpy (readbuf, regval + tdep->wordsize - len, len); |
| 2059 | else |
| 2060 | memcpy (readbuf + offset, regval, len); |
| 2061 | } |
| 2062 | } |
| 2063 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 2064 | } |
| 2065 | |
| 2066 | /* Handle plain base types. */ |
| 2067 | if (ppc64_sysv_abi_return_value_base (gdbarch, valtype, regcache, |
| 2068 | readbuf, writebuf, 0)) |
| 2069 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 2070 | |
| 2071 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 2072 | } |
| 2073 | |