| 1 | /* Target-dependent code for PowerPC systems using the SVR4 ABI |
| 2 | for GDB, the GNU debugger. |
| 3 | |
| 4 | Copyright (C) 2000, 2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011 |
| 5 | Free Software Foundation, Inc. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "inferior.h" |
| 25 | #include "regcache.h" |
| 26 | #include "value.h" |
| 27 | #include "gdb_string.h" |
| 28 | #include "gdb_assert.h" |
| 29 | #include "ppc-tdep.h" |
| 30 | #include "target.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "infcall.h" |
| 33 | #include "dwarf2.h" |
| 34 | |
| 35 | /* Pass the arguments in either registers, or in the stack. Using the |
| 36 | ppc sysv ABI, the first eight words of the argument list (that might |
| 37 | be less than eight parameters if some parameters occupy more than one |
| 38 | word) are passed in r3..r10 registers. float and double parameters are |
| 39 | passed in fpr's, in addition to that. Rest of the parameters if any |
| 40 | are passed in user stack. |
| 41 | |
| 42 | If the function is returning a structure, then the return address is passed |
| 43 | in r3, then the first 7 words of the parametes can be passed in registers, |
| 44 | starting from r4. */ |
| 45 | |
| 46 | CORE_ADDR |
| 47 | ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 48 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 49 | int nargs, struct value **args, CORE_ADDR sp, |
| 50 | int struct_return, CORE_ADDR struct_addr) |
| 51 | { |
| 52 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 53 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 54 | struct type *ftype; |
| 55 | int opencl_abi = 0; |
| 56 | ULONGEST saved_sp; |
| 57 | int argspace = 0; /* 0 is an initial wrong guess. */ |
| 58 | int write_pass; |
| 59 | |
| 60 | gdb_assert (tdep->wordsize == 4); |
| 61 | |
| 62 | regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch), |
| 63 | &saved_sp); |
| 64 | |
| 65 | ftype = check_typedef (value_type (function)); |
| 66 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 67 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 68 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 69 | && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL) |
| 70 | opencl_abi = 1; |
| 71 | |
| 72 | /* Go through the argument list twice. |
| 73 | |
| 74 | Pass 1: Figure out how much new stack space is required for |
| 75 | arguments and pushed values. Unlike the PowerOpen ABI, the SysV |
| 76 | ABI doesn't reserve any extra space for parameters which are put |
| 77 | in registers, but does always push structures and then pass their |
| 78 | address. |
| 79 | |
| 80 | Pass 2: Replay the same computation but this time also write the |
| 81 | values out to the target. */ |
| 82 | |
| 83 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 84 | { |
| 85 | int argno; |
| 86 | /* Next available floating point register for float and double |
| 87 | arguments. */ |
| 88 | int freg = 1; |
| 89 | /* Next available general register for non-float, non-vector |
| 90 | arguments. */ |
| 91 | int greg = 3; |
| 92 | /* Next available vector register for vector arguments. */ |
| 93 | int vreg = 2; |
| 94 | /* Arguments start above the "LR save word" and "Back chain". */ |
| 95 | int argoffset = 2 * tdep->wordsize; |
| 96 | /* Structures start after the arguments. */ |
| 97 | int structoffset = argoffset + argspace; |
| 98 | |
| 99 | /* If the function is returning a `struct', then the first word |
| 100 | (which will be passed in r3) is used for struct return |
| 101 | address. In that case we should advance one word and start |
| 102 | from r4 register to copy parameters. */ |
| 103 | if (struct_return) |
| 104 | { |
| 105 | if (write_pass) |
| 106 | regcache_cooked_write_signed (regcache, |
| 107 | tdep->ppc_gp0_regnum + greg, |
| 108 | struct_addr); |
| 109 | greg++; |
| 110 | } |
| 111 | |
| 112 | for (argno = 0; argno < nargs; argno++) |
| 113 | { |
| 114 | struct value *arg = args[argno]; |
| 115 | struct type *type = check_typedef (value_type (arg)); |
| 116 | int len = TYPE_LENGTH (type); |
| 117 | const bfd_byte *val = value_contents (arg); |
| 118 | |
| 119 | if (TYPE_CODE (type) == TYPE_CODE_FLT && len <= 8 |
| 120 | && !tdep->soft_float) |
| 121 | { |
| 122 | /* Floating point value converted to "double" then |
| 123 | passed in an FP register, when the registers run out, |
| 124 | 8 byte aligned stack is used. */ |
| 125 | if (freg <= 8) |
| 126 | { |
| 127 | if (write_pass) |
| 128 | { |
| 129 | /* Always store the floating point value using |
| 130 | the register's floating-point format. */ |
| 131 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 132 | struct type *regtype |
| 133 | = register_type (gdbarch, tdep->ppc_fp0_regnum + freg); |
| 134 | convert_typed_floating (val, type, regval, regtype); |
| 135 | regcache_cooked_write (regcache, |
| 136 | tdep->ppc_fp0_regnum + freg, |
| 137 | regval); |
| 138 | } |
| 139 | freg++; |
| 140 | } |
| 141 | else |
| 142 | { |
| 143 | /* The SysV ABI tells us to convert floats to |
| 144 | doubles before writing them to an 8 byte aligned |
| 145 | stack location. Unfortunately GCC does not do |
| 146 | that, and stores floats into 4 byte aligned |
| 147 | locations without converting them to doubles. |
| 148 | Since there is no know compiler that actually |
| 149 | follows the ABI here, we implement the GCC |
| 150 | convention. */ |
| 151 | |
| 152 | /* Align to 4 bytes or 8 bytes depending on the type of |
| 153 | the argument (float or double). */ |
| 154 | argoffset = align_up (argoffset, len); |
| 155 | if (write_pass) |
| 156 | write_memory (sp + argoffset, val, len); |
| 157 | argoffset += len; |
| 158 | } |
| 159 | } |
| 160 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 161 | && len == 16 |
| 162 | && !tdep->soft_float |
| 163 | && (gdbarch_long_double_format (gdbarch) |
| 164 | == floatformats_ibm_long_double)) |
| 165 | { |
| 166 | /* IBM long double passed in two FP registers if |
| 167 | available, otherwise 8-byte aligned stack. */ |
| 168 | if (freg <= 7) |
| 169 | { |
| 170 | if (write_pass) |
| 171 | { |
| 172 | regcache_cooked_write (regcache, |
| 173 | tdep->ppc_fp0_regnum + freg, |
| 174 | val); |
| 175 | regcache_cooked_write (regcache, |
| 176 | tdep->ppc_fp0_regnum + freg + 1, |
| 177 | val + 8); |
| 178 | } |
| 179 | freg += 2; |
| 180 | } |
| 181 | else |
| 182 | { |
| 183 | argoffset = align_up (argoffset, 8); |
| 184 | if (write_pass) |
| 185 | write_memory (sp + argoffset, val, len); |
| 186 | argoffset += 16; |
| 187 | } |
| 188 | } |
| 189 | else if (len == 8 |
| 190 | && (TYPE_CODE (type) == TYPE_CODE_INT /* long long */ |
| 191 | || TYPE_CODE (type) == TYPE_CODE_FLT /* double */ |
| 192 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT |
| 193 | && tdep->soft_float))) |
| 194 | { |
| 195 | /* "long long" or soft-float "double" or "_Decimal64" |
| 196 | passed in an odd/even register pair with the low |
| 197 | addressed word in the odd register and the high |
| 198 | addressed word in the even register, or when the |
| 199 | registers run out an 8 byte aligned stack |
| 200 | location. */ |
| 201 | if (greg > 9) |
| 202 | { |
| 203 | /* Just in case GREG was 10. */ |
| 204 | greg = 11; |
| 205 | argoffset = align_up (argoffset, 8); |
| 206 | if (write_pass) |
| 207 | write_memory (sp + argoffset, val, len); |
| 208 | argoffset += 8; |
| 209 | } |
| 210 | else |
| 211 | { |
| 212 | /* Must start on an odd register - r3/r4 etc. */ |
| 213 | if ((greg & 1) == 0) |
| 214 | greg++; |
| 215 | if (write_pass) |
| 216 | { |
| 217 | regcache_cooked_write (regcache, |
| 218 | tdep->ppc_gp0_regnum + greg + 0, |
| 219 | val + 0); |
| 220 | regcache_cooked_write (regcache, |
| 221 | tdep->ppc_gp0_regnum + greg + 1, |
| 222 | val + 4); |
| 223 | } |
| 224 | greg += 2; |
| 225 | } |
| 226 | } |
| 227 | else if (len == 16 |
| 228 | && ((TYPE_CODE (type) == TYPE_CODE_FLT |
| 229 | && (gdbarch_long_double_format (gdbarch) |
| 230 | == floatformats_ibm_long_double)) |
| 231 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT |
| 232 | && tdep->soft_float))) |
| 233 | { |
| 234 | /* Soft-float IBM long double or _Decimal128 passed in |
| 235 | four consecutive registers, or on the stack. The |
| 236 | registers are not necessarily odd/even pairs. */ |
| 237 | if (greg > 7) |
| 238 | { |
| 239 | greg = 11; |
| 240 | argoffset = align_up (argoffset, 8); |
| 241 | if (write_pass) |
| 242 | write_memory (sp + argoffset, val, len); |
| 243 | argoffset += 16; |
| 244 | } |
| 245 | else |
| 246 | { |
| 247 | if (write_pass) |
| 248 | { |
| 249 | regcache_cooked_write (regcache, |
| 250 | tdep->ppc_gp0_regnum + greg + 0, |
| 251 | val + 0); |
| 252 | regcache_cooked_write (regcache, |
| 253 | tdep->ppc_gp0_regnum + greg + 1, |
| 254 | val + 4); |
| 255 | regcache_cooked_write (regcache, |
| 256 | tdep->ppc_gp0_regnum + greg + 2, |
| 257 | val + 8); |
| 258 | regcache_cooked_write (regcache, |
| 259 | tdep->ppc_gp0_regnum + greg + 3, |
| 260 | val + 12); |
| 261 | } |
| 262 | greg += 4; |
| 263 | } |
| 264 | } |
| 265 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len <= 8 |
| 266 | && !tdep->soft_float) |
| 267 | { |
| 268 | /* 32-bit and 64-bit decimal floats go in f1 .. f8. They can |
| 269 | end up in memory. */ |
| 270 | |
| 271 | if (freg <= 8) |
| 272 | { |
| 273 | if (write_pass) |
| 274 | { |
| 275 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 276 | const gdb_byte *p; |
| 277 | |
| 278 | /* 32-bit decimal floats are right aligned in the |
| 279 | doubleword. */ |
| 280 | if (TYPE_LENGTH (type) == 4) |
| 281 | { |
| 282 | memcpy (regval + 4, val, 4); |
| 283 | p = regval; |
| 284 | } |
| 285 | else |
| 286 | p = val; |
| 287 | |
| 288 | regcache_cooked_write (regcache, |
| 289 | tdep->ppc_fp0_regnum + freg, p); |
| 290 | } |
| 291 | |
| 292 | freg++; |
| 293 | } |
| 294 | else |
| 295 | { |
| 296 | argoffset = align_up (argoffset, len); |
| 297 | |
| 298 | if (write_pass) |
| 299 | /* Write value in the stack's parameter save area. */ |
| 300 | write_memory (sp + argoffset, val, len); |
| 301 | |
| 302 | argoffset += len; |
| 303 | } |
| 304 | } |
| 305 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && len == 16 |
| 306 | && !tdep->soft_float) |
| 307 | { |
| 308 | /* 128-bit decimal floats go in f2 .. f7, always in even/odd |
| 309 | pairs. They can end up in memory, using two doublewords. */ |
| 310 | |
| 311 | if (freg <= 6) |
| 312 | { |
| 313 | /* Make sure freg is even. */ |
| 314 | freg += freg & 1; |
| 315 | |
| 316 | if (write_pass) |
| 317 | { |
| 318 | regcache_cooked_write (regcache, |
| 319 | tdep->ppc_fp0_regnum + freg, val); |
| 320 | regcache_cooked_write (regcache, |
| 321 | tdep->ppc_fp0_regnum + freg + 1, val + 8); |
| 322 | } |
| 323 | } |
| 324 | else |
| 325 | { |
| 326 | argoffset = align_up (argoffset, 8); |
| 327 | |
| 328 | if (write_pass) |
| 329 | write_memory (sp + argoffset, val, 16); |
| 330 | |
| 331 | argoffset += 16; |
| 332 | } |
| 333 | |
| 334 | /* If a 128-bit decimal float goes to the stack because only f7 |
| 335 | and f8 are free (thus there's no even/odd register pair |
| 336 | available), these registers should be marked as occupied. |
| 337 | Hence we increase freg even when writing to memory. */ |
| 338 | freg += 2; |
| 339 | } |
| 340 | else if (len < 16 |
| 341 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 342 | && TYPE_VECTOR (type) |
| 343 | && opencl_abi) |
| 344 | { |
| 345 | /* OpenCL vectors shorter than 16 bytes are passed as if |
| 346 | a series of independent scalars. */ |
| 347 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 348 | int i, nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 349 | |
| 350 | for (i = 0; i < nelt; i++) |
| 351 | { |
| 352 | const gdb_byte *elval = val + i * TYPE_LENGTH (eltype); |
| 353 | |
| 354 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT && !tdep->soft_float) |
| 355 | { |
| 356 | if (freg <= 8) |
| 357 | { |
| 358 | if (write_pass) |
| 359 | { |
| 360 | int regnum = tdep->ppc_fp0_regnum + freg; |
| 361 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 362 | struct type *regtype |
| 363 | = register_type (gdbarch, regnum); |
| 364 | convert_typed_floating (elval, eltype, |
| 365 | regval, regtype); |
| 366 | regcache_cooked_write (regcache, regnum, regval); |
| 367 | } |
| 368 | freg++; |
| 369 | } |
| 370 | else |
| 371 | { |
| 372 | argoffset = align_up (argoffset, len); |
| 373 | if (write_pass) |
| 374 | write_memory (sp + argoffset, val, len); |
| 375 | argoffset += len; |
| 376 | } |
| 377 | } |
| 378 | else if (TYPE_LENGTH (eltype) == 8) |
| 379 | { |
| 380 | if (greg > 9) |
| 381 | { |
| 382 | /* Just in case GREG was 10. */ |
| 383 | greg = 11; |
| 384 | argoffset = align_up (argoffset, 8); |
| 385 | if (write_pass) |
| 386 | write_memory (sp + argoffset, elval, |
| 387 | TYPE_LENGTH (eltype)); |
| 388 | argoffset += 8; |
| 389 | } |
| 390 | else |
| 391 | { |
| 392 | /* Must start on an odd register - r3/r4 etc. */ |
| 393 | if ((greg & 1) == 0) |
| 394 | greg++; |
| 395 | if (write_pass) |
| 396 | { |
| 397 | int regnum = tdep->ppc_gp0_regnum + greg; |
| 398 | regcache_cooked_write (regcache, |
| 399 | regnum + 0, elval + 0); |
| 400 | regcache_cooked_write (regcache, |
| 401 | regnum + 1, elval + 4); |
| 402 | } |
| 403 | greg += 2; |
| 404 | } |
| 405 | } |
| 406 | else |
| 407 | { |
| 408 | gdb_byte word[MAX_REGISTER_SIZE]; |
| 409 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 410 | unpack_long (eltype, elval)); |
| 411 | |
| 412 | if (greg <= 10) |
| 413 | { |
| 414 | if (write_pass) |
| 415 | regcache_cooked_write (regcache, |
| 416 | tdep->ppc_gp0_regnum + greg, |
| 417 | word); |
| 418 | greg++; |
| 419 | } |
| 420 | else |
| 421 | { |
| 422 | argoffset = align_up (argoffset, tdep->wordsize); |
| 423 | if (write_pass) |
| 424 | write_memory (sp + argoffset, word, tdep->wordsize); |
| 425 | argoffset += tdep->wordsize; |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | else if (len >= 16 |
| 431 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 432 | && TYPE_VECTOR (type) |
| 433 | && opencl_abi) |
| 434 | { |
| 435 | /* OpenCL vectors 16 bytes or longer are passed as if |
| 436 | a series of AltiVec vectors. */ |
| 437 | int i; |
| 438 | |
| 439 | for (i = 0; i < len / 16; i++) |
| 440 | { |
| 441 | const gdb_byte *elval = val + i * 16; |
| 442 | |
| 443 | if (vreg <= 13) |
| 444 | { |
| 445 | if (write_pass) |
| 446 | regcache_cooked_write (regcache, |
| 447 | tdep->ppc_vr0_regnum + vreg, |
| 448 | elval); |
| 449 | vreg++; |
| 450 | } |
| 451 | else |
| 452 | { |
| 453 | argoffset = align_up (argoffset, 16); |
| 454 | if (write_pass) |
| 455 | write_memory (sp + argoffset, elval, 16); |
| 456 | argoffset += 16; |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | else if (len == 16 |
| 461 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 462 | && TYPE_VECTOR (type) |
| 463 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 464 | { |
| 465 | /* Vector parameter passed in an Altivec register, or |
| 466 | when that runs out, 16 byte aligned stack location. */ |
| 467 | if (vreg <= 13) |
| 468 | { |
| 469 | if (write_pass) |
| 470 | regcache_cooked_write (regcache, |
| 471 | tdep->ppc_vr0_regnum + vreg, val); |
| 472 | vreg++; |
| 473 | } |
| 474 | else |
| 475 | { |
| 476 | argoffset = align_up (argoffset, 16); |
| 477 | if (write_pass) |
| 478 | write_memory (sp + argoffset, val, 16); |
| 479 | argoffset += 16; |
| 480 | } |
| 481 | } |
| 482 | else if (len == 8 |
| 483 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 484 | && TYPE_VECTOR (type) |
| 485 | && tdep->vector_abi == POWERPC_VEC_SPE) |
| 486 | { |
| 487 | /* Vector parameter passed in an e500 register, or when |
| 488 | that runs out, 8 byte aligned stack location. Note |
| 489 | that since e500 vector and general purpose registers |
| 490 | both map onto the same underlying register set, a |
| 491 | "greg" and not a "vreg" is consumed here. A cooked |
| 492 | write stores the value in the correct locations |
| 493 | within the raw register cache. */ |
| 494 | if (greg <= 10) |
| 495 | { |
| 496 | if (write_pass) |
| 497 | regcache_cooked_write (regcache, |
| 498 | tdep->ppc_ev0_regnum + greg, val); |
| 499 | greg++; |
| 500 | } |
| 501 | else |
| 502 | { |
| 503 | argoffset = align_up (argoffset, 8); |
| 504 | if (write_pass) |
| 505 | write_memory (sp + argoffset, val, 8); |
| 506 | argoffset += 8; |
| 507 | } |
| 508 | } |
| 509 | else |
| 510 | { |
| 511 | /* Reduce the parameter down to something that fits in a |
| 512 | "word". */ |
| 513 | gdb_byte word[MAX_REGISTER_SIZE]; |
| 514 | memset (word, 0, MAX_REGISTER_SIZE); |
| 515 | if (len > tdep->wordsize |
| 516 | || TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 517 | || TYPE_CODE (type) == TYPE_CODE_UNION) |
| 518 | { |
| 519 | /* Structs and large values are put in an |
| 520 | aligned stack slot ... */ |
| 521 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 522 | && TYPE_VECTOR (type) |
| 523 | && len >= 16) |
| 524 | structoffset = align_up (structoffset, 16); |
| 525 | else |
| 526 | structoffset = align_up (structoffset, 8); |
| 527 | |
| 528 | if (write_pass) |
| 529 | write_memory (sp + structoffset, val, len); |
| 530 | /* ... and then a "word" pointing to that address is |
| 531 | passed as the parameter. */ |
| 532 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 533 | sp + structoffset); |
| 534 | structoffset += len; |
| 535 | } |
| 536 | else if (TYPE_CODE (type) == TYPE_CODE_INT) |
| 537 | /* Sign or zero extend the "int" into a "word". */ |
| 538 | store_unsigned_integer (word, tdep->wordsize, byte_order, |
| 539 | unpack_long (type, val)); |
| 540 | else |
| 541 | /* Always goes in the low address. */ |
| 542 | memcpy (word, val, len); |
| 543 | /* Store that "word" in a register, or on the stack. |
| 544 | The words have "4" byte alignment. */ |
| 545 | if (greg <= 10) |
| 546 | { |
| 547 | if (write_pass) |
| 548 | regcache_cooked_write (regcache, |
| 549 | tdep->ppc_gp0_regnum + greg, word); |
| 550 | greg++; |
| 551 | } |
| 552 | else |
| 553 | { |
| 554 | argoffset = align_up (argoffset, tdep->wordsize); |
| 555 | if (write_pass) |
| 556 | write_memory (sp + argoffset, word, tdep->wordsize); |
| 557 | argoffset += tdep->wordsize; |
| 558 | } |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /* Compute the actual stack space requirements. */ |
| 563 | if (!write_pass) |
| 564 | { |
| 565 | /* Remember the amount of space needed by the arguments. */ |
| 566 | argspace = argoffset; |
| 567 | /* Allocate space for both the arguments and the structures. */ |
| 568 | sp -= (argoffset + structoffset); |
| 569 | /* Ensure that the stack is still 16 byte aligned. */ |
| 570 | sp = align_down (sp, 16); |
| 571 | } |
| 572 | |
| 573 | /* The psABI says that "A caller of a function that takes a |
| 574 | variable argument list shall set condition register bit 6 to |
| 575 | 1 if it passes one or more arguments in the floating-point |
| 576 | registers. It is strongly recommended that the caller set the |
| 577 | bit to 0 otherwise..." Doing this for normal functions too |
| 578 | shouldn't hurt. */ |
| 579 | if (write_pass) |
| 580 | { |
| 581 | ULONGEST cr; |
| 582 | |
| 583 | regcache_cooked_read_unsigned (regcache, tdep->ppc_cr_regnum, &cr); |
| 584 | if (freg > 1) |
| 585 | cr |= 0x02000000; |
| 586 | else |
| 587 | cr &= ~0x02000000; |
| 588 | regcache_cooked_write_unsigned (regcache, tdep->ppc_cr_regnum, cr); |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /* Update %sp. */ |
| 593 | regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp); |
| 594 | |
| 595 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 596 | write_memory_signed_integer (sp, tdep->wordsize, byte_order, saved_sp); |
| 597 | |
| 598 | /* Point the inferior function call's return address at the dummy's |
| 599 | breakpoint. */ |
| 600 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 601 | |
| 602 | return sp; |
| 603 | } |
| 604 | |
| 605 | /* Handle the return-value conventions for Decimal Floating Point values |
| 606 | in both ppc32 and ppc64, which are the same. */ |
| 607 | static int |
| 608 | get_decimal_float_return_value (struct gdbarch *gdbarch, struct type *valtype, |
| 609 | struct regcache *regcache, gdb_byte *readbuf, |
| 610 | const gdb_byte *writebuf) |
| 611 | { |
| 612 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 613 | |
| 614 | gdb_assert (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT); |
| 615 | |
| 616 | /* 32-bit and 64-bit decimal floats in f1. */ |
| 617 | if (TYPE_LENGTH (valtype) <= 8) |
| 618 | { |
| 619 | if (writebuf != NULL) |
| 620 | { |
| 621 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 622 | const gdb_byte *p; |
| 623 | |
| 624 | /* 32-bit decimal float is right aligned in the doubleword. */ |
| 625 | if (TYPE_LENGTH (valtype) == 4) |
| 626 | { |
| 627 | memcpy (regval + 4, writebuf, 4); |
| 628 | p = regval; |
| 629 | } |
| 630 | else |
| 631 | p = writebuf; |
| 632 | |
| 633 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, p); |
| 634 | } |
| 635 | if (readbuf != NULL) |
| 636 | { |
| 637 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf); |
| 638 | |
| 639 | /* Left align 32-bit decimal float. */ |
| 640 | if (TYPE_LENGTH (valtype) == 4) |
| 641 | memcpy (readbuf, readbuf + 4, 4); |
| 642 | } |
| 643 | } |
| 644 | /* 128-bit decimal floats in f2,f3. */ |
| 645 | else if (TYPE_LENGTH (valtype) == 16) |
| 646 | { |
| 647 | if (writebuf != NULL || readbuf != NULL) |
| 648 | { |
| 649 | int i; |
| 650 | |
| 651 | for (i = 0; i < 2; i++) |
| 652 | { |
| 653 | if (writebuf != NULL) |
| 654 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2 + i, |
| 655 | writebuf + i * 8); |
| 656 | if (readbuf != NULL) |
| 657 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2 + i, |
| 658 | readbuf + i * 8); |
| 659 | } |
| 660 | } |
| 661 | } |
| 662 | else |
| 663 | /* Can't happen. */ |
| 664 | internal_error (__FILE__, __LINE__, _("Unknown decimal float size.")); |
| 665 | |
| 666 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 667 | } |
| 668 | |
| 669 | /* Handle the return-value conventions specified by the SysV 32-bit |
| 670 | PowerPC ABI (including all the supplements): |
| 671 | |
| 672 | no floating-point: floating-point values returned using 32-bit |
| 673 | general-purpose registers. |
| 674 | |
| 675 | Altivec: 128-bit vectors returned using vector registers. |
| 676 | |
| 677 | e500: 64-bit vectors returned using the full full 64 bit EV |
| 678 | register, floating-point values returned using 32-bit |
| 679 | general-purpose registers. |
| 680 | |
| 681 | GCC (broken): Small struct values right (instead of left) aligned |
| 682 | when returned in general-purpose registers. */ |
| 683 | |
| 684 | static enum return_value_convention |
| 685 | do_ppc_sysv_return_value (struct gdbarch *gdbarch, struct type *func_type, |
| 686 | struct type *type, struct regcache *regcache, |
| 687 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 688 | int broken_gcc) |
| 689 | { |
| 690 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 691 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 692 | int opencl_abi = 0; |
| 693 | |
| 694 | if (func_type |
| 695 | && TYPE_CALLING_CONVENTION (func_type) == DW_CC_GDB_IBM_OpenCL) |
| 696 | opencl_abi = 1; |
| 697 | |
| 698 | gdb_assert (tdep->wordsize == 4); |
| 699 | |
| 700 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 701 | && TYPE_LENGTH (type) <= 8 |
| 702 | && !tdep->soft_float) |
| 703 | { |
| 704 | if (readbuf) |
| 705 | { |
| 706 | /* Floats and doubles stored in "f1". Convert the value to |
| 707 | the required type. */ |
| 708 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 709 | struct type *regtype = register_type (gdbarch, |
| 710 | tdep->ppc_fp0_regnum + 1); |
| 711 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 712 | convert_typed_floating (regval, regtype, readbuf, type); |
| 713 | } |
| 714 | if (writebuf) |
| 715 | { |
| 716 | /* Floats and doubles stored in "f1". Convert the value to |
| 717 | the register's "double" type. */ |
| 718 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 719 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 720 | convert_typed_floating (writebuf, type, regval, regtype); |
| 721 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 722 | } |
| 723 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 724 | } |
| 725 | if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 726 | && TYPE_LENGTH (type) == 16 |
| 727 | && !tdep->soft_float |
| 728 | && (gdbarch_long_double_format (gdbarch) |
| 729 | == floatformats_ibm_long_double)) |
| 730 | { |
| 731 | /* IBM long double stored in f1 and f2. */ |
| 732 | if (readbuf) |
| 733 | { |
| 734 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, readbuf); |
| 735 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 2, |
| 736 | readbuf + 8); |
| 737 | } |
| 738 | if (writebuf) |
| 739 | { |
| 740 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, writebuf); |
| 741 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 2, |
| 742 | writebuf + 8); |
| 743 | } |
| 744 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 745 | } |
| 746 | if (TYPE_LENGTH (type) == 16 |
| 747 | && ((TYPE_CODE (type) == TYPE_CODE_FLT |
| 748 | && (gdbarch_long_double_format (gdbarch) |
| 749 | == floatformats_ibm_long_double)) |
| 750 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && tdep->soft_float))) |
| 751 | { |
| 752 | /* Soft-float IBM long double or _Decimal128 stored in r3, r4, |
| 753 | r5, r6. */ |
| 754 | if (readbuf) |
| 755 | { |
| 756 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf); |
| 757 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 758 | readbuf + 4); |
| 759 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5, |
| 760 | readbuf + 8); |
| 761 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6, |
| 762 | readbuf + 12); |
| 763 | } |
| 764 | if (writebuf) |
| 765 | { |
| 766 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf); |
| 767 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 768 | writebuf + 4); |
| 769 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5, |
| 770 | writebuf + 8); |
| 771 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6, |
| 772 | writebuf + 12); |
| 773 | } |
| 774 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 775 | } |
| 776 | if ((TYPE_CODE (type) == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) |
| 777 | || (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8) |
| 778 | || (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && TYPE_LENGTH (type) == 8 |
| 779 | && tdep->soft_float)) |
| 780 | { |
| 781 | if (readbuf) |
| 782 | { |
| 783 | /* A long long, double or _Decimal64 stored in the 32 bit |
| 784 | r3/r4. */ |
| 785 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 786 | readbuf + 0); |
| 787 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 788 | readbuf + 4); |
| 789 | } |
| 790 | if (writebuf) |
| 791 | { |
| 792 | /* A long long, double or _Decimal64 stored in the 32 bit |
| 793 | r3/r4. */ |
| 794 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 795 | writebuf + 0); |
| 796 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 797 | writebuf + 4); |
| 798 | } |
| 799 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 800 | } |
| 801 | if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && !tdep->soft_float) |
| 802 | return get_decimal_float_return_value (gdbarch, type, regcache, readbuf, |
| 803 | writebuf); |
| 804 | else if ((TYPE_CODE (type) == TYPE_CODE_INT |
| 805 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 806 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 807 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 808 | || TYPE_CODE (type) == TYPE_CODE_REF |
| 809 | || TYPE_CODE (type) == TYPE_CODE_ENUM) |
| 810 | && TYPE_LENGTH (type) <= tdep->wordsize) |
| 811 | { |
| 812 | if (readbuf) |
| 813 | { |
| 814 | /* Some sort of integer stored in r3. Since TYPE isn't |
| 815 | bigger than the register, sign extension isn't a problem |
| 816 | - just do everything unsigned. */ |
| 817 | ULONGEST regval; |
| 818 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 819 | ®val); |
| 820 | store_unsigned_integer (readbuf, TYPE_LENGTH (type), byte_order, |
| 821 | regval); |
| 822 | } |
| 823 | if (writebuf) |
| 824 | { |
| 825 | /* Some sort of integer stored in r3. Use unpack_long since |
| 826 | that should handle any required sign extension. */ |
| 827 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 828 | unpack_long (type, writebuf)); |
| 829 | } |
| 830 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 831 | } |
| 832 | /* OpenCL vectors < 16 bytes are returned as distinct |
| 833 | scalars in f1..f2 or r3..r10. */ |
| 834 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 835 | && TYPE_VECTOR (type) |
| 836 | && TYPE_LENGTH (type) < 16 |
| 837 | && opencl_abi) |
| 838 | { |
| 839 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 840 | int i, nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 841 | |
| 842 | for (i = 0; i < nelt; i++) |
| 843 | { |
| 844 | int offset = i * TYPE_LENGTH (eltype); |
| 845 | |
| 846 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT) |
| 847 | { |
| 848 | int regnum = tdep->ppc_fp0_regnum + 1 + i; |
| 849 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 850 | struct type *regtype = register_type (gdbarch, regnum); |
| 851 | |
| 852 | if (writebuf != NULL) |
| 853 | { |
| 854 | convert_typed_floating (writebuf + offset, eltype, |
| 855 | regval, regtype); |
| 856 | regcache_cooked_write (regcache, regnum, regval); |
| 857 | } |
| 858 | if (readbuf != NULL) |
| 859 | { |
| 860 | regcache_cooked_read (regcache, regnum, regval); |
| 861 | convert_typed_floating (regval, regtype, |
| 862 | readbuf + offset, eltype); |
| 863 | } |
| 864 | } |
| 865 | else |
| 866 | { |
| 867 | int regnum = tdep->ppc_gp0_regnum + 3 + i; |
| 868 | ULONGEST regval; |
| 869 | |
| 870 | if (writebuf != NULL) |
| 871 | { |
| 872 | regval = unpack_long (eltype, writebuf + offset); |
| 873 | regcache_cooked_write_unsigned (regcache, regnum, regval); |
| 874 | } |
| 875 | if (readbuf != NULL) |
| 876 | { |
| 877 | regcache_cooked_read_unsigned (regcache, regnum, ®val); |
| 878 | store_unsigned_integer (readbuf + offset, |
| 879 | TYPE_LENGTH (eltype), byte_order, |
| 880 | regval); |
| 881 | } |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 886 | } |
| 887 | /* OpenCL vectors >= 16 bytes are returned in v2..v9. */ |
| 888 | if (TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 889 | && TYPE_VECTOR (type) |
| 890 | && TYPE_LENGTH (type) >= 16 |
| 891 | && opencl_abi) |
| 892 | { |
| 893 | int n_regs = TYPE_LENGTH (type) / 16; |
| 894 | int i; |
| 895 | |
| 896 | for (i = 0; i < n_regs; i++) |
| 897 | { |
| 898 | int offset = i * 16; |
| 899 | int regnum = tdep->ppc_vr0_regnum + 2 + i; |
| 900 | |
| 901 | if (writebuf != NULL) |
| 902 | regcache_cooked_write (regcache, regnum, writebuf + offset); |
| 903 | if (readbuf != NULL) |
| 904 | regcache_cooked_read (regcache, regnum, readbuf + offset); |
| 905 | } |
| 906 | |
| 907 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 908 | } |
| 909 | if (TYPE_LENGTH (type) == 16 |
| 910 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 911 | && TYPE_VECTOR (type) |
| 912 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 913 | { |
| 914 | if (readbuf) |
| 915 | { |
| 916 | /* Altivec places the return value in "v2". */ |
| 917 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
| 918 | } |
| 919 | if (writebuf) |
| 920 | { |
| 921 | /* Altivec places the return value in "v2". */ |
| 922 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, writebuf); |
| 923 | } |
| 924 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 925 | } |
| 926 | if (TYPE_LENGTH (type) == 16 |
| 927 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 928 | && TYPE_VECTOR (type) |
| 929 | && tdep->vector_abi == POWERPC_VEC_GENERIC) |
| 930 | { |
| 931 | /* GCC -maltivec -mabi=no-altivec returns vectors in r3/r4/r5/r6. |
| 932 | GCC without AltiVec returns them in memory, but it warns about |
| 933 | ABI risks in that case; we don't try to support it. */ |
| 934 | if (readbuf) |
| 935 | { |
| 936 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 937 | readbuf + 0); |
| 938 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 939 | readbuf + 4); |
| 940 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 5, |
| 941 | readbuf + 8); |
| 942 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 6, |
| 943 | readbuf + 12); |
| 944 | } |
| 945 | if (writebuf) |
| 946 | { |
| 947 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 948 | writebuf + 0); |
| 949 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 950 | writebuf + 4); |
| 951 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 5, |
| 952 | writebuf + 8); |
| 953 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 6, |
| 954 | writebuf + 12); |
| 955 | } |
| 956 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 957 | } |
| 958 | if (TYPE_LENGTH (type) == 8 |
| 959 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 960 | && TYPE_VECTOR (type) |
| 961 | && tdep->vector_abi == POWERPC_VEC_SPE) |
| 962 | { |
| 963 | /* The e500 ABI places return values for the 64-bit DSP types |
| 964 | (__ev64_opaque__) in r3. However, in GDB-speak, ev3 |
| 965 | corresponds to the entire r3 value for e500, whereas GDB's r3 |
| 966 | only corresponds to the least significant 32-bits. So place |
| 967 | the 64-bit DSP type's value in ev3. */ |
| 968 | if (readbuf) |
| 969 | regcache_cooked_read (regcache, tdep->ppc_ev0_regnum + 3, readbuf); |
| 970 | if (writebuf) |
| 971 | regcache_cooked_write (regcache, tdep->ppc_ev0_regnum + 3, writebuf); |
| 972 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 973 | } |
| 974 | if (broken_gcc && TYPE_LENGTH (type) <= 8) |
| 975 | { |
| 976 | /* GCC screwed up for structures or unions whose size is less |
| 977 | than or equal to 8 bytes.. Instead of left-aligning, it |
| 978 | right-aligns the data into the buffer formed by r3, r4. */ |
| 979 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 980 | int len = TYPE_LENGTH (type); |
| 981 | int offset = (2 * tdep->wordsize - len) % tdep->wordsize; |
| 982 | |
| 983 | if (readbuf) |
| 984 | { |
| 985 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 986 | regvals + 0 * tdep->wordsize); |
| 987 | if (len > tdep->wordsize) |
| 988 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 989 | regvals + 1 * tdep->wordsize); |
| 990 | memcpy (readbuf, regvals + offset, len); |
| 991 | } |
| 992 | if (writebuf) |
| 993 | { |
| 994 | memset (regvals, 0, sizeof regvals); |
| 995 | memcpy (regvals + offset, writebuf, len); |
| 996 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 997 | regvals + 0 * tdep->wordsize); |
| 998 | if (len > tdep->wordsize) |
| 999 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 1000 | regvals + 1 * tdep->wordsize); |
| 1001 | } |
| 1002 | |
| 1003 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1004 | } |
| 1005 | if (TYPE_LENGTH (type) <= 8) |
| 1006 | { |
| 1007 | if (readbuf) |
| 1008 | { |
| 1009 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 1010 | /* The value is right-padded to 8 bytes and then loaded, as |
| 1011 | two "words", into r3/r4. */ |
| 1012 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 1013 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, |
| 1014 | regvals + 0 * tdep->wordsize); |
| 1015 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 1016 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 4, |
| 1017 | regvals + 1 * tdep->wordsize); |
| 1018 | memcpy (readbuf, regvals, TYPE_LENGTH (type)); |
| 1019 | } |
| 1020 | if (writebuf) |
| 1021 | { |
| 1022 | /* This matches SVr4 PPC, it does not match GCC. */ |
| 1023 | /* The value is padded out to 8 bytes and then loaded, as |
| 1024 | two "words" into r3/r4. */ |
| 1025 | gdb_byte regvals[MAX_REGISTER_SIZE * 2]; |
| 1026 | memset (regvals, 0, sizeof regvals); |
| 1027 | memcpy (regvals, writebuf, TYPE_LENGTH (type)); |
| 1028 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, |
| 1029 | regvals + 0 * tdep->wordsize); |
| 1030 | if (TYPE_LENGTH (type) > tdep->wordsize) |
| 1031 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 4, |
| 1032 | regvals + 1 * tdep->wordsize); |
| 1033 | } |
| 1034 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1035 | } |
| 1036 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 1037 | } |
| 1038 | |
| 1039 | enum return_value_convention |
| 1040 | ppc_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type, |
| 1041 | struct type *valtype, struct regcache *regcache, |
| 1042 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1043 | { |
| 1044 | return do_ppc_sysv_return_value (gdbarch, func_type, valtype, regcache, |
| 1045 | readbuf, writebuf, 0); |
| 1046 | } |
| 1047 | |
| 1048 | enum return_value_convention |
| 1049 | ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch, |
| 1050 | struct type *func_type, |
| 1051 | struct type *valtype, |
| 1052 | struct regcache *regcache, |
| 1053 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1054 | { |
| 1055 | return do_ppc_sysv_return_value (gdbarch, func_type, valtype, regcache, |
| 1056 | readbuf, writebuf, 1); |
| 1057 | } |
| 1058 | |
| 1059 | /* The helper function for 64-bit SYSV push_dummy_call. Converts the |
| 1060 | function's code address back into the function's descriptor |
| 1061 | address. |
| 1062 | |
| 1063 | Find a value for the TOC register. Every symbol should have both |
| 1064 | ".FN" and "FN" in the minimal symbol table. "FN" points at the |
| 1065 | FN's descriptor, while ".FN" points at the entry point (which |
| 1066 | matches FUNC_ADDR). Need to reverse from FUNC_ADDR back to the |
| 1067 | FN's descriptor address (while at the same time being careful to |
| 1068 | find "FN" in the same object file as ".FN"). */ |
| 1069 | |
| 1070 | static int |
| 1071 | convert_code_addr_to_desc_addr (CORE_ADDR code_addr, CORE_ADDR *desc_addr) |
| 1072 | { |
| 1073 | struct obj_section *dot_fn_section; |
| 1074 | struct minimal_symbol *dot_fn; |
| 1075 | struct minimal_symbol *fn; |
| 1076 | CORE_ADDR toc; |
| 1077 | /* Find the minimal symbol that corresponds to CODE_ADDR (should |
| 1078 | have a name of the form ".FN"). */ |
| 1079 | dot_fn = lookup_minimal_symbol_by_pc (code_addr); |
| 1080 | if (dot_fn == NULL || SYMBOL_LINKAGE_NAME (dot_fn)[0] != '.') |
| 1081 | return 0; |
| 1082 | /* Get the section that contains CODE_ADDR. Need this for the |
| 1083 | "objfile" that it contains. */ |
| 1084 | dot_fn_section = find_pc_section (code_addr); |
| 1085 | if (dot_fn_section == NULL || dot_fn_section->objfile == NULL) |
| 1086 | return 0; |
| 1087 | /* Now find the corresponding "FN" (dropping ".") minimal symbol's |
| 1088 | address. Only look for the minimal symbol in ".FN"'s object file |
| 1089 | - avoids problems when two object files (i.e., shared libraries) |
| 1090 | contain a minimal symbol with the same name. */ |
| 1091 | fn = lookup_minimal_symbol (SYMBOL_LINKAGE_NAME (dot_fn) + 1, NULL, |
| 1092 | dot_fn_section->objfile); |
| 1093 | if (fn == NULL) |
| 1094 | return 0; |
| 1095 | /* Found a descriptor. */ |
| 1096 | (*desc_addr) = SYMBOL_VALUE_ADDRESS (fn); |
| 1097 | return 1; |
| 1098 | } |
| 1099 | |
| 1100 | /* Pass the arguments in either registers, or in the stack. Using the |
| 1101 | ppc 64 bit SysV ABI. |
| 1102 | |
| 1103 | This implements a dumbed down version of the ABI. It always writes |
| 1104 | values to memory, GPR and FPR, even when not necessary. Doing this |
| 1105 | greatly simplifies the logic. */ |
| 1106 | |
| 1107 | CORE_ADDR |
| 1108 | ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, |
| 1109 | struct value *function, |
| 1110 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 1111 | int nargs, struct value **args, CORE_ADDR sp, |
| 1112 | int struct_return, CORE_ADDR struct_addr) |
| 1113 | { |
| 1114 | CORE_ADDR func_addr = find_function_addr (function, NULL); |
| 1115 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1116 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1117 | struct type *ftype; |
| 1118 | int opencl_abi = 0; |
| 1119 | ULONGEST back_chain; |
| 1120 | /* See for-loop comment below. */ |
| 1121 | int write_pass; |
| 1122 | /* Size of the by-reference parameter copy region, the final value is |
| 1123 | computed in the for-loop below. */ |
| 1124 | LONGEST refparam_size = 0; |
| 1125 | /* Size of the general parameter region, the final value is computed |
| 1126 | in the for-loop below. */ |
| 1127 | LONGEST gparam_size = 0; |
| 1128 | /* Kevin writes ... I don't mind seeing tdep->wordsize used in the |
| 1129 | calls to align_up(), align_down(), etc. because this makes it |
| 1130 | easier to reuse this code (in a copy/paste sense) in the future, |
| 1131 | but it is a 64-bit ABI and asserting that the wordsize is 8 bytes |
| 1132 | at some point makes it easier to verify that this function is |
| 1133 | correct without having to do a non-local analysis to figure out |
| 1134 | the possible values of tdep->wordsize. */ |
| 1135 | gdb_assert (tdep->wordsize == 8); |
| 1136 | |
| 1137 | /* This function exists to support a calling convention that |
| 1138 | requires floating-point registers. It shouldn't be used on |
| 1139 | processors that lack them. */ |
| 1140 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 1141 | |
| 1142 | /* By this stage in the proceedings, SP has been decremented by "red |
| 1143 | zone size" + "struct return size". Fetch the stack-pointer from |
| 1144 | before this and use that as the BACK_CHAIN. */ |
| 1145 | regcache_cooked_read_unsigned (regcache, gdbarch_sp_regnum (gdbarch), |
| 1146 | &back_chain); |
| 1147 | |
| 1148 | ftype = check_typedef (value_type (function)); |
| 1149 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR) |
| 1150 | ftype = check_typedef (TYPE_TARGET_TYPE (ftype)); |
| 1151 | if (TYPE_CODE (ftype) == TYPE_CODE_FUNC |
| 1152 | && TYPE_CALLING_CONVENTION (ftype) == DW_CC_GDB_IBM_OpenCL) |
| 1153 | opencl_abi = 1; |
| 1154 | |
| 1155 | /* Go through the argument list twice. |
| 1156 | |
| 1157 | Pass 1: Compute the function call's stack space and register |
| 1158 | requirements. |
| 1159 | |
| 1160 | Pass 2: Replay the same computation but this time also write the |
| 1161 | values out to the target. */ |
| 1162 | |
| 1163 | for (write_pass = 0; write_pass < 2; write_pass++) |
| 1164 | { |
| 1165 | int argno; |
| 1166 | /* Next available floating point register for float and double |
| 1167 | arguments. */ |
| 1168 | int freg = 1; |
| 1169 | /* Next available general register for non-vector (but possibly |
| 1170 | float) arguments. */ |
| 1171 | int greg = 3; |
| 1172 | /* Next available vector register for vector arguments. */ |
| 1173 | int vreg = 2; |
| 1174 | /* The address, at which the next general purpose parameter |
| 1175 | (integer, struct, float, vector, ...) should be saved. */ |
| 1176 | CORE_ADDR gparam; |
| 1177 | /* The address, at which the next by-reference parameter |
| 1178 | (non-Altivec vector, variably-sized type) should be saved. */ |
| 1179 | CORE_ADDR refparam; |
| 1180 | |
| 1181 | if (!write_pass) |
| 1182 | { |
| 1183 | /* During the first pass, GPARAM and REFPARAM are more like |
| 1184 | offsets (start address zero) than addresses. That way |
| 1185 | they accumulate the total stack space each region |
| 1186 | requires. */ |
| 1187 | gparam = 0; |
| 1188 | refparam = 0; |
| 1189 | } |
| 1190 | else |
| 1191 | { |
| 1192 | /* Decrement the stack pointer making space for the Altivec |
| 1193 | and general on-stack parameters. Set refparam and gparam |
| 1194 | to their corresponding regions. */ |
| 1195 | refparam = align_down (sp - refparam_size, 16); |
| 1196 | gparam = align_down (refparam - gparam_size, 16); |
| 1197 | /* Add in space for the TOC, link editor double word, |
| 1198 | compiler double word, LR save area, CR save area. */ |
| 1199 | sp = align_down (gparam - 48, 16); |
| 1200 | } |
| 1201 | |
| 1202 | /* If the function is returning a `struct', then there is an |
| 1203 | extra hidden parameter (which will be passed in r3) |
| 1204 | containing the address of that struct.. In that case we |
| 1205 | should advance one word and start from r4 register to copy |
| 1206 | parameters. This also consumes one on-stack parameter slot. */ |
| 1207 | if (struct_return) |
| 1208 | { |
| 1209 | if (write_pass) |
| 1210 | regcache_cooked_write_signed (regcache, |
| 1211 | tdep->ppc_gp0_regnum + greg, |
| 1212 | struct_addr); |
| 1213 | greg++; |
| 1214 | gparam = align_up (gparam + tdep->wordsize, tdep->wordsize); |
| 1215 | } |
| 1216 | |
| 1217 | for (argno = 0; argno < nargs; argno++) |
| 1218 | { |
| 1219 | struct value *arg = args[argno]; |
| 1220 | struct type *type = check_typedef (value_type (arg)); |
| 1221 | const bfd_byte *val = value_contents (arg); |
| 1222 | |
| 1223 | if (TYPE_CODE (type) == TYPE_CODE_FLT && TYPE_LENGTH (type) <= 8) |
| 1224 | { |
| 1225 | /* Floats and Doubles go in f1 .. f13. They also |
| 1226 | consume a left aligned GREG,, and can end up in |
| 1227 | memory. */ |
| 1228 | if (write_pass) |
| 1229 | { |
| 1230 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1231 | const gdb_byte *p; |
| 1232 | |
| 1233 | /* Version 1.7 of the 64-bit PowerPC ELF ABI says: |
| 1234 | |
| 1235 | "Single precision floating point values are mapped to |
| 1236 | the first word in a single doubleword." |
| 1237 | |
| 1238 | And version 1.9 says: |
| 1239 | |
| 1240 | "Single precision floating point values are mapped to |
| 1241 | the second word in a single doubleword." |
| 1242 | |
| 1243 | GDB then writes single precision floating point values |
| 1244 | at both words in a doubleword, to support both ABIs. */ |
| 1245 | if (TYPE_LENGTH (type) == 4) |
| 1246 | { |
| 1247 | memcpy (regval, val, 4); |
| 1248 | memcpy (regval + 4, val, 4); |
| 1249 | p = regval; |
| 1250 | } |
| 1251 | else |
| 1252 | p = val; |
| 1253 | |
| 1254 | /* Write value in the stack's parameter save area. */ |
| 1255 | write_memory (gparam, p, 8); |
| 1256 | |
| 1257 | if (freg <= 13) |
| 1258 | { |
| 1259 | struct type *regtype |
| 1260 | = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 1261 | |
| 1262 | convert_typed_floating (val, type, regval, regtype); |
| 1263 | regcache_cooked_write (regcache, |
| 1264 | tdep->ppc_fp0_regnum + freg, |
| 1265 | regval); |
| 1266 | } |
| 1267 | if (greg <= 10) |
| 1268 | regcache_cooked_write (regcache, |
| 1269 | tdep->ppc_gp0_regnum + greg, |
| 1270 | regval); |
| 1271 | } |
| 1272 | |
| 1273 | freg++; |
| 1274 | greg++; |
| 1275 | /* Always consume parameter stack space. */ |
| 1276 | gparam = align_up (gparam + 8, tdep->wordsize); |
| 1277 | } |
| 1278 | else if (TYPE_CODE (type) == TYPE_CODE_FLT |
| 1279 | && TYPE_LENGTH (type) == 16 |
| 1280 | && (gdbarch_long_double_format (gdbarch) |
| 1281 | == floatformats_ibm_long_double)) |
| 1282 | { |
| 1283 | /* IBM long double stored in two doublewords of the |
| 1284 | parameter save area and corresponding registers. */ |
| 1285 | if (write_pass) |
| 1286 | { |
| 1287 | if (!tdep->soft_float && freg <= 13) |
| 1288 | { |
| 1289 | regcache_cooked_write (regcache, |
| 1290 | tdep->ppc_fp0_regnum + freg, |
| 1291 | val); |
| 1292 | if (freg <= 12) |
| 1293 | regcache_cooked_write (regcache, |
| 1294 | tdep->ppc_fp0_regnum + freg + 1, |
| 1295 | val + 8); |
| 1296 | } |
| 1297 | if (greg <= 10) |
| 1298 | { |
| 1299 | regcache_cooked_write (regcache, |
| 1300 | tdep->ppc_gp0_regnum + greg, |
| 1301 | val); |
| 1302 | if (greg <= 9) |
| 1303 | regcache_cooked_write (regcache, |
| 1304 | tdep->ppc_gp0_regnum + greg + 1, |
| 1305 | val + 8); |
| 1306 | } |
| 1307 | write_memory (gparam, val, TYPE_LENGTH (type)); |
| 1308 | } |
| 1309 | freg += 2; |
| 1310 | greg += 2; |
| 1311 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 1312 | } |
| 1313 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT |
| 1314 | && TYPE_LENGTH (type) <= 8) |
| 1315 | { |
| 1316 | /* 32-bit and 64-bit decimal floats go in f1 .. f13. They can |
| 1317 | end up in memory. */ |
| 1318 | if (write_pass) |
| 1319 | { |
| 1320 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1321 | const gdb_byte *p; |
| 1322 | |
| 1323 | /* 32-bit decimal floats are right aligned in the |
| 1324 | doubleword. */ |
| 1325 | if (TYPE_LENGTH (type) == 4) |
| 1326 | { |
| 1327 | memcpy (regval + 4, val, 4); |
| 1328 | p = regval; |
| 1329 | } |
| 1330 | else |
| 1331 | p = val; |
| 1332 | |
| 1333 | /* Write value in the stack's parameter save area. */ |
| 1334 | write_memory (gparam, p, 8); |
| 1335 | |
| 1336 | if (freg <= 13) |
| 1337 | regcache_cooked_write (regcache, |
| 1338 | tdep->ppc_fp0_regnum + freg, p); |
| 1339 | } |
| 1340 | |
| 1341 | freg++; |
| 1342 | greg++; |
| 1343 | /* Always consume parameter stack space. */ |
| 1344 | gparam = align_up (gparam + 8, tdep->wordsize); |
| 1345 | } |
| 1346 | else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT && |
| 1347 | TYPE_LENGTH (type) == 16) |
| 1348 | { |
| 1349 | /* 128-bit decimal floats go in f2 .. f12, always in even/odd |
| 1350 | pairs. They can end up in memory, using two doublewords. */ |
| 1351 | if (write_pass) |
| 1352 | { |
| 1353 | if (freg <= 12) |
| 1354 | { |
| 1355 | /* Make sure freg is even. */ |
| 1356 | freg += freg & 1; |
| 1357 | regcache_cooked_write (regcache, |
| 1358 | tdep->ppc_fp0_regnum + freg, val); |
| 1359 | regcache_cooked_write (regcache, |
| 1360 | tdep->ppc_fp0_regnum + freg + 1, val + 8); |
| 1361 | } |
| 1362 | |
| 1363 | write_memory (gparam, val, TYPE_LENGTH (type)); |
| 1364 | } |
| 1365 | |
| 1366 | freg += 2; |
| 1367 | greg += 2; |
| 1368 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 1369 | } |
| 1370 | else if (TYPE_LENGTH (type) < 16 |
| 1371 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 1372 | && TYPE_VECTOR (type) |
| 1373 | && opencl_abi) |
| 1374 | { |
| 1375 | /* OpenCL vectors shorter than 16 bytes are passed as if |
| 1376 | a series of independent scalars. */ |
| 1377 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1378 | int i, nelt = TYPE_LENGTH (type) / TYPE_LENGTH (eltype); |
| 1379 | |
| 1380 | for (i = 0; i < nelt; i++) |
| 1381 | { |
| 1382 | const gdb_byte *elval = val + i * TYPE_LENGTH (eltype); |
| 1383 | |
| 1384 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT) |
| 1385 | { |
| 1386 | if (write_pass) |
| 1387 | { |
| 1388 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1389 | const gdb_byte *p; |
| 1390 | |
| 1391 | if (TYPE_LENGTH (eltype) == 4) |
| 1392 | { |
| 1393 | memcpy (regval, elval, 4); |
| 1394 | memcpy (regval + 4, elval, 4); |
| 1395 | p = regval; |
| 1396 | } |
| 1397 | else |
| 1398 | p = elval; |
| 1399 | |
| 1400 | write_memory (gparam, p, 8); |
| 1401 | |
| 1402 | if (freg <= 13) |
| 1403 | { |
| 1404 | int regnum = tdep->ppc_fp0_regnum + freg; |
| 1405 | struct type *regtype |
| 1406 | = register_type (gdbarch, regnum); |
| 1407 | |
| 1408 | convert_typed_floating (elval, eltype, |
| 1409 | regval, regtype); |
| 1410 | regcache_cooked_write (regcache, regnum, regval); |
| 1411 | } |
| 1412 | |
| 1413 | if (greg <= 10) |
| 1414 | regcache_cooked_write (regcache, |
| 1415 | tdep->ppc_gp0_regnum + greg, |
| 1416 | regval); |
| 1417 | } |
| 1418 | |
| 1419 | freg++; |
| 1420 | greg++; |
| 1421 | gparam = align_up (gparam + 8, tdep->wordsize); |
| 1422 | } |
| 1423 | else |
| 1424 | { |
| 1425 | if (write_pass) |
| 1426 | { |
| 1427 | ULONGEST word = unpack_long (eltype, elval); |
| 1428 | if (greg <= 10) |
| 1429 | regcache_cooked_write_unsigned |
| 1430 | (regcache, tdep->ppc_gp0_regnum + greg, word); |
| 1431 | |
| 1432 | write_memory_unsigned_integer |
| 1433 | (gparam, tdep->wordsize, byte_order, word); |
| 1434 | } |
| 1435 | |
| 1436 | greg++; |
| 1437 | gparam = align_up (gparam + TYPE_LENGTH (eltype), |
| 1438 | tdep->wordsize); |
| 1439 | } |
| 1440 | } |
| 1441 | } |
| 1442 | else if (TYPE_LENGTH (type) >= 16 |
| 1443 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 1444 | && TYPE_VECTOR (type) |
| 1445 | && opencl_abi) |
| 1446 | { |
| 1447 | /* OpenCL vectors 16 bytes or longer are passed as if |
| 1448 | a series of AltiVec vectors. */ |
| 1449 | int i; |
| 1450 | |
| 1451 | for (i = 0; i < TYPE_LENGTH (type) / 16; i++) |
| 1452 | { |
| 1453 | const gdb_byte *elval = val + i * 16; |
| 1454 | |
| 1455 | gparam = align_up (gparam, 16); |
| 1456 | greg += greg & 1; |
| 1457 | |
| 1458 | if (write_pass) |
| 1459 | { |
| 1460 | if (vreg <= 13) |
| 1461 | regcache_cooked_write (regcache, |
| 1462 | tdep->ppc_vr0_regnum + vreg, |
| 1463 | elval); |
| 1464 | |
| 1465 | write_memory (gparam, elval, 16); |
| 1466 | } |
| 1467 | |
| 1468 | greg += 2; |
| 1469 | vreg++; |
| 1470 | gparam += 16; |
| 1471 | } |
| 1472 | } |
| 1473 | else if (TYPE_LENGTH (type) == 16 && TYPE_VECTOR (type) |
| 1474 | && TYPE_CODE (type) == TYPE_CODE_ARRAY |
| 1475 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 1476 | { |
| 1477 | /* In the Altivec ABI, vectors go in the vector registers |
| 1478 | v2 .. v13, as well as the parameter area -- always at |
| 1479 | 16-byte aligned addresses. */ |
| 1480 | |
| 1481 | gparam = align_up (gparam, 16); |
| 1482 | greg += greg & 1; |
| 1483 | |
| 1484 | if (write_pass) |
| 1485 | { |
| 1486 | if (vreg <= 13) |
| 1487 | regcache_cooked_write (regcache, |
| 1488 | tdep->ppc_vr0_regnum + vreg, val); |
| 1489 | |
| 1490 | write_memory (gparam, val, TYPE_LENGTH (type)); |
| 1491 | } |
| 1492 | |
| 1493 | greg += 2; |
| 1494 | vreg++; |
| 1495 | gparam += 16; |
| 1496 | } |
| 1497 | else if (TYPE_LENGTH (type) >= 16 && TYPE_VECTOR (type) |
| 1498 | && TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 1499 | { |
| 1500 | /* Non-Altivec vectors are passed by reference. */ |
| 1501 | |
| 1502 | /* Copy value onto the stack ... */ |
| 1503 | refparam = align_up (refparam, 16); |
| 1504 | if (write_pass) |
| 1505 | write_memory (refparam, val, TYPE_LENGTH (type)); |
| 1506 | |
| 1507 | /* ... and pass a pointer to the copy as parameter. */ |
| 1508 | if (write_pass) |
| 1509 | { |
| 1510 | if (greg <= 10) |
| 1511 | regcache_cooked_write_unsigned (regcache, |
| 1512 | tdep->ppc_gp0_regnum + |
| 1513 | greg, refparam); |
| 1514 | write_memory_unsigned_integer (gparam, tdep->wordsize, |
| 1515 | byte_order, refparam); |
| 1516 | } |
| 1517 | greg++; |
| 1518 | gparam = align_up (gparam + tdep->wordsize, tdep->wordsize); |
| 1519 | refparam = align_up (refparam + TYPE_LENGTH (type), tdep->wordsize); |
| 1520 | } |
| 1521 | else if ((TYPE_CODE (type) == TYPE_CODE_INT |
| 1522 | || TYPE_CODE (type) == TYPE_CODE_ENUM |
| 1523 | || TYPE_CODE (type) == TYPE_CODE_BOOL |
| 1524 | || TYPE_CODE (type) == TYPE_CODE_CHAR |
| 1525 | || TYPE_CODE (type) == TYPE_CODE_PTR |
| 1526 | || TYPE_CODE (type) == TYPE_CODE_REF) |
| 1527 | && TYPE_LENGTH (type) <= 8) |
| 1528 | { |
| 1529 | /* Scalars and Pointers get sign[un]extended and go in |
| 1530 | gpr3 .. gpr10. They can also end up in memory. */ |
| 1531 | if (write_pass) |
| 1532 | { |
| 1533 | /* Sign extend the value, then store it unsigned. */ |
| 1534 | ULONGEST word = unpack_long (type, val); |
| 1535 | /* Convert any function code addresses into |
| 1536 | descriptors. */ |
| 1537 | if (TYPE_CODE (type) == TYPE_CODE_PTR |
| 1538 | || TYPE_CODE (type) == TYPE_CODE_REF) |
| 1539 | { |
| 1540 | struct type *target_type; |
| 1541 | target_type = check_typedef (TYPE_TARGET_TYPE (type)); |
| 1542 | |
| 1543 | if (TYPE_CODE (target_type) == TYPE_CODE_FUNC |
| 1544 | || TYPE_CODE (target_type) == TYPE_CODE_METHOD) |
| 1545 | { |
| 1546 | CORE_ADDR desc = word; |
| 1547 | convert_code_addr_to_desc_addr (word, &desc); |
| 1548 | word = desc; |
| 1549 | } |
| 1550 | } |
| 1551 | if (greg <= 10) |
| 1552 | regcache_cooked_write_unsigned (regcache, |
| 1553 | tdep->ppc_gp0_regnum + |
| 1554 | greg, word); |
| 1555 | write_memory_unsigned_integer (gparam, tdep->wordsize, |
| 1556 | byte_order, word); |
| 1557 | } |
| 1558 | greg++; |
| 1559 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 1560 | } |
| 1561 | else |
| 1562 | { |
| 1563 | int byte; |
| 1564 | for (byte = 0; byte < TYPE_LENGTH (type); |
| 1565 | byte += tdep->wordsize) |
| 1566 | { |
| 1567 | if (write_pass && greg <= 10) |
| 1568 | { |
| 1569 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1570 | int len = TYPE_LENGTH (type) - byte; |
| 1571 | if (len > tdep->wordsize) |
| 1572 | len = tdep->wordsize; |
| 1573 | memset (regval, 0, sizeof regval); |
| 1574 | /* The ABI (version 1.9) specifies that values |
| 1575 | smaller than one doubleword are right-aligned |
| 1576 | and those larger are left-aligned. GCC |
| 1577 | versions before 3.4 implemented this |
| 1578 | incorrectly; see |
| 1579 | <http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */ |
| 1580 | if (byte == 0) |
| 1581 | memcpy (regval + tdep->wordsize - len, |
| 1582 | val + byte, len); |
| 1583 | else |
| 1584 | memcpy (regval, val + byte, len); |
| 1585 | regcache_cooked_write (regcache, greg, regval); |
| 1586 | } |
| 1587 | greg++; |
| 1588 | } |
| 1589 | if (write_pass) |
| 1590 | { |
| 1591 | /* WARNING: cagney/2003-09-21: Strictly speaking, this |
| 1592 | isn't necessary, unfortunately, GCC appears to get |
| 1593 | "struct convention" parameter passing wrong putting |
| 1594 | odd sized structures in memory instead of in a |
| 1595 | register. Work around this by always writing the |
| 1596 | value to memory. Fortunately, doing this |
| 1597 | simplifies the code. */ |
| 1598 | int len = TYPE_LENGTH (type); |
| 1599 | if (len < tdep->wordsize) |
| 1600 | write_memory (gparam + tdep->wordsize - len, val, len); |
| 1601 | else |
| 1602 | write_memory (gparam, val, len); |
| 1603 | } |
| 1604 | if (freg <= 13 |
| 1605 | && TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1606 | && TYPE_NFIELDS (type) == 1 |
| 1607 | && TYPE_LENGTH (type) <= 16) |
| 1608 | { |
| 1609 | /* The ABI (version 1.9) specifies that structs |
| 1610 | containing a single floating-point value, at any |
| 1611 | level of nesting of single-member structs, are |
| 1612 | passed in floating-point registers. */ |
| 1613 | while (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 1614 | && TYPE_NFIELDS (type) == 1) |
| 1615 | type = check_typedef (TYPE_FIELD_TYPE (type, 0)); |
| 1616 | if (TYPE_CODE (type) == TYPE_CODE_FLT) |
| 1617 | { |
| 1618 | if (TYPE_LENGTH (type) <= 8) |
| 1619 | { |
| 1620 | if (write_pass) |
| 1621 | { |
| 1622 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1623 | struct type *regtype |
| 1624 | = register_type (gdbarch, |
| 1625 | tdep->ppc_fp0_regnum); |
| 1626 | convert_typed_floating (val, type, regval, |
| 1627 | regtype); |
| 1628 | regcache_cooked_write (regcache, |
| 1629 | (tdep->ppc_fp0_regnum |
| 1630 | + freg), |
| 1631 | regval); |
| 1632 | } |
| 1633 | freg++; |
| 1634 | } |
| 1635 | else if (TYPE_LENGTH (type) == 16 |
| 1636 | && (gdbarch_long_double_format (gdbarch) |
| 1637 | == floatformats_ibm_long_double)) |
| 1638 | { |
| 1639 | if (write_pass) |
| 1640 | { |
| 1641 | regcache_cooked_write (regcache, |
| 1642 | (tdep->ppc_fp0_regnum |
| 1643 | + freg), |
| 1644 | val); |
| 1645 | if (freg <= 12) |
| 1646 | regcache_cooked_write (regcache, |
| 1647 | (tdep->ppc_fp0_regnum |
| 1648 | + freg + 1), |
| 1649 | val + 8); |
| 1650 | } |
| 1651 | freg += 2; |
| 1652 | } |
| 1653 | } |
| 1654 | } |
| 1655 | /* Always consume parameter stack space. */ |
| 1656 | gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize); |
| 1657 | } |
| 1658 | } |
| 1659 | |
| 1660 | if (!write_pass) |
| 1661 | { |
| 1662 | /* Save the true region sizes ready for the second pass. */ |
| 1663 | refparam_size = refparam; |
| 1664 | /* Make certain that the general parameter save area is at |
| 1665 | least the minimum 8 registers (or doublewords) in size. */ |
| 1666 | if (greg < 8) |
| 1667 | gparam_size = 8 * tdep->wordsize; |
| 1668 | else |
| 1669 | gparam_size = gparam; |
| 1670 | } |
| 1671 | } |
| 1672 | |
| 1673 | /* Update %sp. */ |
| 1674 | regcache_cooked_write_signed (regcache, gdbarch_sp_regnum (gdbarch), sp); |
| 1675 | |
| 1676 | /* Write the backchain (it occupies WORDSIZED bytes). */ |
| 1677 | write_memory_signed_integer (sp, tdep->wordsize, byte_order, back_chain); |
| 1678 | |
| 1679 | /* Point the inferior function call's return address at the dummy's |
| 1680 | breakpoint. */ |
| 1681 | regcache_cooked_write_signed (regcache, tdep->ppc_lr_regnum, bp_addr); |
| 1682 | |
| 1683 | /* Use the func_addr to find the descriptor, and use that to find |
| 1684 | the TOC. If we're calling via a function pointer, the pointer |
| 1685 | itself identifies the descriptor. */ |
| 1686 | { |
| 1687 | struct type *ftype = check_typedef (value_type (function)); |
| 1688 | CORE_ADDR desc_addr = value_as_address (function); |
| 1689 | |
| 1690 | if (TYPE_CODE (ftype) == TYPE_CODE_PTR |
| 1691 | || convert_code_addr_to_desc_addr (func_addr, &desc_addr)) |
| 1692 | { |
| 1693 | /* The TOC is the second double word in the descriptor. */ |
| 1694 | CORE_ADDR toc = |
| 1695 | read_memory_unsigned_integer (desc_addr + tdep->wordsize, |
| 1696 | tdep->wordsize, byte_order); |
| 1697 | regcache_cooked_write_unsigned (regcache, |
| 1698 | tdep->ppc_gp0_regnum + 2, toc); |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | return sp; |
| 1703 | } |
| 1704 | |
| 1705 | |
| 1706 | /* The 64 bit ABI return value convention. |
| 1707 | |
| 1708 | Return non-zero if the return-value is stored in a register, return |
| 1709 | 0 if the return-value is instead stored on the stack (a.k.a., |
| 1710 | struct return convention). |
| 1711 | |
| 1712 | For a return-value stored in a register: when WRITEBUF is non-NULL, |
| 1713 | copy the buffer to the corresponding register return-value location |
| 1714 | location; when READBUF is non-NULL, fill the buffer from the |
| 1715 | corresponding register return-value location. */ |
| 1716 | enum return_value_convention |
| 1717 | ppc64_sysv_abi_return_value (struct gdbarch *gdbarch, struct type *func_type, |
| 1718 | struct type *valtype, struct regcache *regcache, |
| 1719 | gdb_byte *readbuf, const gdb_byte *writebuf) |
| 1720 | { |
| 1721 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1722 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 1723 | int opencl_abi = 0; |
| 1724 | |
| 1725 | if (func_type |
| 1726 | && TYPE_CALLING_CONVENTION (func_type) == DW_CC_GDB_IBM_OpenCL) |
| 1727 | opencl_abi = 1; |
| 1728 | |
| 1729 | /* This function exists to support a calling convention that |
| 1730 | requires floating-point registers. It shouldn't be used on |
| 1731 | processors that lack them. */ |
| 1732 | gdb_assert (ppc_floating_point_unit_p (gdbarch)); |
| 1733 | |
| 1734 | /* Floats and doubles in F1. */ |
| 1735 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT && TYPE_LENGTH (valtype) <= 8) |
| 1736 | { |
| 1737 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1738 | struct type *regtype = register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 1739 | if (writebuf != NULL) |
| 1740 | { |
| 1741 | convert_typed_floating (writebuf, valtype, regval, regtype); |
| 1742 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 1743 | } |
| 1744 | if (readbuf != NULL) |
| 1745 | { |
| 1746 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1, regval); |
| 1747 | convert_typed_floating (regval, regtype, readbuf, valtype); |
| 1748 | } |
| 1749 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1750 | } |
| 1751 | if (TYPE_CODE (valtype) == TYPE_CODE_DECFLOAT) |
| 1752 | return get_decimal_float_return_value (gdbarch, valtype, regcache, readbuf, |
| 1753 | writebuf); |
| 1754 | /* Integers in r3. */ |
| 1755 | if ((TYPE_CODE (valtype) == TYPE_CODE_INT |
| 1756 | || TYPE_CODE (valtype) == TYPE_CODE_ENUM |
| 1757 | || TYPE_CODE (valtype) == TYPE_CODE_CHAR |
| 1758 | || TYPE_CODE (valtype) == TYPE_CODE_BOOL) |
| 1759 | && TYPE_LENGTH (valtype) <= 8) |
| 1760 | { |
| 1761 | if (writebuf != NULL) |
| 1762 | { |
| 1763 | /* Be careful to sign extend the value. */ |
| 1764 | regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 1765 | unpack_long (valtype, writebuf)); |
| 1766 | } |
| 1767 | if (readbuf != NULL) |
| 1768 | { |
| 1769 | /* Extract the integer from r3. Since this is truncating the |
| 1770 | value, there isn't a sign extension problem. */ |
| 1771 | ULONGEST regval; |
| 1772 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3, |
| 1773 | ®val); |
| 1774 | store_unsigned_integer (readbuf, TYPE_LENGTH (valtype), byte_order, |
| 1775 | regval); |
| 1776 | } |
| 1777 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1778 | } |
| 1779 | /* All pointers live in r3. */ |
| 1780 | if (TYPE_CODE (valtype) == TYPE_CODE_PTR |
| 1781 | || TYPE_CODE (valtype) == TYPE_CODE_REF) |
| 1782 | { |
| 1783 | /* All pointers live in r3. */ |
| 1784 | if (writebuf != NULL) |
| 1785 | regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, writebuf); |
| 1786 | if (readbuf != NULL) |
| 1787 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, readbuf); |
| 1788 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1789 | } |
| 1790 | /* OpenCL vectors < 16 bytes are returned as distinct |
| 1791 | scalars in f1..f2 or r3..r10. */ |
| 1792 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 1793 | && TYPE_VECTOR (valtype) |
| 1794 | && TYPE_LENGTH (valtype) < 16 |
| 1795 | && opencl_abi) |
| 1796 | { |
| 1797 | struct type *eltype = check_typedef (TYPE_TARGET_TYPE (valtype)); |
| 1798 | int i, nelt = TYPE_LENGTH (valtype) / TYPE_LENGTH (eltype); |
| 1799 | |
| 1800 | for (i = 0; i < nelt; i++) |
| 1801 | { |
| 1802 | int offset = i * TYPE_LENGTH (eltype); |
| 1803 | |
| 1804 | if (TYPE_CODE (eltype) == TYPE_CODE_FLT) |
| 1805 | { |
| 1806 | int regnum = tdep->ppc_fp0_regnum + 1 + i; |
| 1807 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1808 | struct type *regtype = register_type (gdbarch, regnum); |
| 1809 | |
| 1810 | if (writebuf != NULL) |
| 1811 | { |
| 1812 | convert_typed_floating (writebuf + offset, eltype, |
| 1813 | regval, regtype); |
| 1814 | regcache_cooked_write (regcache, regnum, regval); |
| 1815 | } |
| 1816 | if (readbuf != NULL) |
| 1817 | { |
| 1818 | regcache_cooked_read (regcache, regnum, regval); |
| 1819 | convert_typed_floating (regval, regtype, |
| 1820 | readbuf + offset, eltype); |
| 1821 | } |
| 1822 | } |
| 1823 | else |
| 1824 | { |
| 1825 | int regnum = tdep->ppc_gp0_regnum + 3 + i; |
| 1826 | ULONGEST regval; |
| 1827 | |
| 1828 | if (writebuf != NULL) |
| 1829 | { |
| 1830 | regval = unpack_long (eltype, writebuf + offset); |
| 1831 | regcache_cooked_write_unsigned (regcache, regnum, regval); |
| 1832 | } |
| 1833 | if (readbuf != NULL) |
| 1834 | { |
| 1835 | regcache_cooked_read_unsigned (regcache, regnum, ®val); |
| 1836 | store_unsigned_integer (readbuf + offset, |
| 1837 | TYPE_LENGTH (eltype), byte_order, |
| 1838 | regval); |
| 1839 | } |
| 1840 | } |
| 1841 | } |
| 1842 | |
| 1843 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1844 | } |
| 1845 | /* OpenCL vectors >= 16 bytes are returned in v2..v9. */ |
| 1846 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 1847 | && TYPE_VECTOR (valtype) |
| 1848 | && TYPE_LENGTH (valtype) >= 16 |
| 1849 | && opencl_abi) |
| 1850 | { |
| 1851 | int n_regs = TYPE_LENGTH (valtype) / 16; |
| 1852 | int i; |
| 1853 | |
| 1854 | for (i = 0; i < n_regs; i++) |
| 1855 | { |
| 1856 | int offset = i * 16; |
| 1857 | int regnum = tdep->ppc_vr0_regnum + 2 + i; |
| 1858 | |
| 1859 | if (writebuf != NULL) |
| 1860 | regcache_cooked_write (regcache, regnum, writebuf + offset); |
| 1861 | if (readbuf != NULL) |
| 1862 | regcache_cooked_read (regcache, regnum, readbuf + offset); |
| 1863 | } |
| 1864 | |
| 1865 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1866 | } |
| 1867 | /* Array type has more than one use. */ |
| 1868 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY) |
| 1869 | { |
| 1870 | /* Small character arrays are returned, right justified, in r3. */ |
| 1871 | if (TYPE_LENGTH (valtype) <= 8 |
| 1872 | && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT |
| 1873 | && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1) |
| 1874 | { |
| 1875 | int offset = (register_size (gdbarch, tdep->ppc_gp0_regnum + 3) |
| 1876 | - TYPE_LENGTH (valtype)); |
| 1877 | if (writebuf != NULL) |
| 1878 | regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3, |
| 1879 | offset, TYPE_LENGTH (valtype), writebuf); |
| 1880 | if (readbuf != NULL) |
| 1881 | regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3, |
| 1882 | offset, TYPE_LENGTH (valtype), readbuf); |
| 1883 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1884 | } |
| 1885 | /* A VMX vector is returned in v2. */ |
| 1886 | if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY |
| 1887 | && TYPE_VECTOR (valtype) |
| 1888 | && tdep->vector_abi == POWERPC_VEC_ALTIVEC) |
| 1889 | { |
| 1890 | if (readbuf) |
| 1891 | regcache_cooked_read (regcache, tdep->ppc_vr0_regnum + 2, readbuf); |
| 1892 | if (writebuf) |
| 1893 | regcache_cooked_write (regcache, tdep->ppc_vr0_regnum + 2, |
| 1894 | writebuf); |
| 1895 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1896 | } |
| 1897 | } |
| 1898 | /* Big floating point values get stored in adjacent floating |
| 1899 | point registers, starting with F1. */ |
| 1900 | if (TYPE_CODE (valtype) == TYPE_CODE_FLT |
| 1901 | && (TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 32)) |
| 1902 | { |
| 1903 | if (writebuf || readbuf != NULL) |
| 1904 | { |
| 1905 | int i; |
| 1906 | for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++) |
| 1907 | { |
| 1908 | if (writebuf != NULL) |
| 1909 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1910 | (const bfd_byte *) writebuf + i * 8); |
| 1911 | if (readbuf != NULL) |
| 1912 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1913 | (bfd_byte *) readbuf + i * 8); |
| 1914 | } |
| 1915 | } |
| 1916 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1917 | } |
| 1918 | /* Complex values get returned in f1:f2, need to convert. */ |
| 1919 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX |
| 1920 | && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16)) |
| 1921 | { |
| 1922 | if (regcache != NULL) |
| 1923 | { |
| 1924 | int i; |
| 1925 | for (i = 0; i < 2; i++) |
| 1926 | { |
| 1927 | gdb_byte regval[MAX_REGISTER_SIZE]; |
| 1928 | struct type *regtype = |
| 1929 | register_type (gdbarch, tdep->ppc_fp0_regnum); |
| 1930 | if (writebuf != NULL) |
| 1931 | { |
| 1932 | convert_typed_floating ((const bfd_byte *) writebuf + |
| 1933 | i * (TYPE_LENGTH (valtype) / 2), |
| 1934 | valtype, regval, regtype); |
| 1935 | regcache_cooked_write (regcache, |
| 1936 | tdep->ppc_fp0_regnum + 1 + i, |
| 1937 | regval); |
| 1938 | } |
| 1939 | if (readbuf != NULL) |
| 1940 | { |
| 1941 | regcache_cooked_read (regcache, |
| 1942 | tdep->ppc_fp0_regnum + 1 + i, |
| 1943 | regval); |
| 1944 | convert_typed_floating (regval, regtype, |
| 1945 | (bfd_byte *) readbuf + |
| 1946 | i * (TYPE_LENGTH (valtype) / 2), |
| 1947 | valtype); |
| 1948 | } |
| 1949 | } |
| 1950 | } |
| 1951 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1952 | } |
| 1953 | /* Big complex values get stored in f1:f4. */ |
| 1954 | if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX && TYPE_LENGTH (valtype) == 32) |
| 1955 | { |
| 1956 | if (regcache != NULL) |
| 1957 | { |
| 1958 | int i; |
| 1959 | for (i = 0; i < 4; i++) |
| 1960 | { |
| 1961 | if (writebuf != NULL) |
| 1962 | regcache_cooked_write (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1963 | (const bfd_byte *) writebuf + i * 8); |
| 1964 | if (readbuf != NULL) |
| 1965 | regcache_cooked_read (regcache, tdep->ppc_fp0_regnum + 1 + i, |
| 1966 | (bfd_byte *) readbuf + i * 8); |
| 1967 | } |
| 1968 | } |
| 1969 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 1970 | } |
| 1971 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 1972 | } |
| 1973 | |