1 /* ----------------------------------------------------------------------- 2 ffi_linux64.c - Copyright (C) 2013 IBM 3 Copyright (C) 2011 Anthony Green 4 Copyright (C) 2011 Kyle Moffett 5 Copyright (C) 2008 Red Hat, Inc 6 Copyright (C) 2007, 2008 Free Software Foundation, Inc 7 Copyright (c) 1998 Geoffrey Keating 8 9 PowerPC Foreign Function Interface 10 11 Permission is hereby granted, free of charge, to any person obtaining 12 a copy of this software and associated documentation files (the 13 ``Software''), to deal in the Software without restriction, including 14 without limitation the rights to use, copy, modify, merge, publish, 15 distribute, sublicense, and/or sell copies of the Software, and to 16 permit persons to whom the Software is furnished to do so, subject to 17 the following conditions: 18 19 The above copyright notice and this permission notice shall be included 20 in all copies or substantial portions of the Software. 21 22 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS 23 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 24 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 25 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 28 OTHER DEALINGS IN THE SOFTWARE. 29 ----------------------------------------------------------------------- */ 30 31 #include "ffi.h" 32 33 #ifdef POWERPC64 34 #include "ffi_common.h" 35 #include "ffi_powerpc.h" 36 37 38 /* About the LINUX64 ABI. */ 39 enum { 40 NUM_GPR_ARG_REGISTERS64 = 8, 41 NUM_FPR_ARG_REGISTERS64 = 13 42 }; 43 enum { ASM_NEEDS_REGISTERS64 = 4 }; 44 45 46 #if HAVE_LONG_DOUBLE_VARIANT && FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 47 /* Adjust size of ffi_type_longdouble. */ 48 void FFI_HIDDEN 49 ffi_prep_types_linux64 (ffi_abi abi) 50 { 51 if ((abi & (FFI_LINUX | FFI_LINUX_LONG_DOUBLE_128)) == FFI_LINUX) 52 { 53 ffi_type_longdouble.size = 8; 54 ffi_type_longdouble.alignment = 8; 55 } 56 else 57 { 58 ffi_type_longdouble.size = 16; 59 ffi_type_longdouble.alignment = 16; 60 } 61 } 62 #endif 63 64 65 #if _CALL_ELF == 2 66 static unsigned int 67 discover_homogeneous_aggregate (const ffi_type *t, unsigned int *elnum) 68 { 69 switch (t->type) 70 { 71 case FFI_TYPE_FLOAT: 72 case FFI_TYPE_DOUBLE: 73 *elnum = 1; 74 return (int) t->type; 75 76 case FFI_TYPE_STRUCT:; 77 { 78 unsigned int base_elt = 0, total_elnum = 0; 79 ffi_type **el = t->elements; 80 while (*el) 81 { 82 unsigned int el_elt, el_elnum = 0; 83 el_elt = discover_homogeneous_aggregate (*el, &el_elnum); 84 if (el_elt == 0 85 || (base_elt && base_elt != el_elt)) 86 return 0; 87 base_elt = el_elt; 88 total_elnum += el_elnum; 89 if (total_elnum > 8) 90 return 0; 91 el++; 92 } 93 *elnum = total_elnum; 94 return base_elt; 95 } 96 97 default: 98 return 0; 99 } 100 } 101 #endif 102 103 104 /* Perform machine dependent cif processing */ 105 static ffi_status 106 ffi_prep_cif_linux64_core (ffi_cif *cif) 107 { 108 ffi_type **ptr; 109 unsigned bytes; 110 unsigned i, fparg_count = 0, intarg_count = 0; 111 unsigned flags = cif->flags; 112 #if _CALL_ELF == 2 113 unsigned int elt, elnum; 114 #endif 115 116 #if FFI_TYPE_LONGDOUBLE == FFI_TYPE_DOUBLE 117 /* If compiled without long double support.. */ 118 if ((cif->abi & FFI_LINUX_LONG_DOUBLE_128) != 0) 119 return FFI_BAD_ABI; 120 #endif 121 122 /* The machine-independent calculation of cif->bytes doesn't work 123 for us. Redo the calculation. */ 124 #if _CALL_ELF == 2 125 /* Space for backchain, CR, LR, TOC and the asm's temp regs. */ 126 bytes = (4 + ASM_NEEDS_REGISTERS64) * sizeof (long); 127 128 /* Space for the general registers. */ 129 bytes += NUM_GPR_ARG_REGISTERS64 * sizeof (long); 130 #else 131 /* Space for backchain, CR, LR, cc/ld doubleword, TOC and the asm's temp 132 regs. */ 133 bytes = (6 + ASM_NEEDS_REGISTERS64) * sizeof (long); 134 135 /* Space for the mandatory parm save area and general registers. */ 136 bytes += 2 * NUM_GPR_ARG_REGISTERS64 * sizeof (long); 137 #endif 138 139 /* Return value handling. */ 140 switch (cif->rtype->type) 141 { 142 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 143 case FFI_TYPE_LONGDOUBLE: 144 if ((cif->abi & FFI_LINUX_LONG_DOUBLE_128) != 0) 145 flags |= FLAG_RETURNS_128BITS; 146 /* Fall through. */ 147 #endif 148 case FFI_TYPE_DOUBLE: 149 flags |= FLAG_RETURNS_64BITS; 150 /* Fall through. */ 151 case FFI_TYPE_FLOAT: 152 flags |= FLAG_RETURNS_FP; 153 break; 154 155 case FFI_TYPE_UINT128: 156 flags |= FLAG_RETURNS_128BITS; 157 /* Fall through. */ 158 case FFI_TYPE_UINT64: 159 case FFI_TYPE_SINT64: 160 flags |= FLAG_RETURNS_64BITS; 161 break; 162 163 case FFI_TYPE_STRUCT: 164 #if _CALL_ELF == 2 165 elt = discover_homogeneous_aggregate (cif->rtype, &elnum); 166 if (elt) 167 { 168 if (elt == FFI_TYPE_DOUBLE) 169 flags |= FLAG_RETURNS_64BITS; 170 flags |= FLAG_RETURNS_FP | FLAG_RETURNS_SMST; 171 break; 172 } 173 if (cif->rtype->size <= 16) 174 { 175 flags |= FLAG_RETURNS_SMST; 176 break; 177 } 178 #endif 179 intarg_count++; 180 flags |= FLAG_RETVAL_REFERENCE; 181 /* Fall through. */ 182 case FFI_TYPE_VOID: 183 flags |= FLAG_RETURNS_NOTHING; 184 break; 185 186 default: 187 /* Returns 32-bit integer, or similar. Nothing to do here. */ 188 break; 189 } 190 191 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) 192 { 193 unsigned int align; 194 195 switch ((*ptr)->type) 196 { 197 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 198 case FFI_TYPE_LONGDOUBLE: 199 if ((cif->abi & FFI_LINUX_LONG_DOUBLE_128) != 0) 200 { 201 fparg_count++; 202 intarg_count++; 203 } 204 /* Fall through. */ 205 #endif 206 case FFI_TYPE_DOUBLE: 207 case FFI_TYPE_FLOAT: 208 fparg_count++; 209 intarg_count++; 210 if (fparg_count > NUM_FPR_ARG_REGISTERS64) 211 flags |= FLAG_ARG_NEEDS_PSAVE; 212 break; 213 214 case FFI_TYPE_STRUCT: 215 if ((cif->abi & FFI_LINUX_STRUCT_ALIGN) != 0) 216 { 217 align = (*ptr)->alignment; 218 if (align > 16) 219 align = 16; 220 align = align / 8; 221 if (align > 1) 222 intarg_count = ALIGN (intarg_count, align); 223 } 224 intarg_count += ((*ptr)->size + 7) / 8; 225 #if _CALL_ELF == 2 226 elt = discover_homogeneous_aggregate (*ptr, &elnum); 227 if (elt) 228 { 229 fparg_count += elnum; 230 if (fparg_count > NUM_FPR_ARG_REGISTERS64) 231 flags |= FLAG_ARG_NEEDS_PSAVE; 232 } 233 else 234 #endif 235 { 236 if (intarg_count > NUM_GPR_ARG_REGISTERS64) 237 flags |= FLAG_ARG_NEEDS_PSAVE; 238 } 239 break; 240 241 case FFI_TYPE_POINTER: 242 case FFI_TYPE_UINT64: 243 case FFI_TYPE_SINT64: 244 case FFI_TYPE_INT: 245 case FFI_TYPE_UINT32: 246 case FFI_TYPE_SINT32: 247 case FFI_TYPE_UINT16: 248 case FFI_TYPE_SINT16: 249 case FFI_TYPE_UINT8: 250 case FFI_TYPE_SINT8: 251 /* Everything else is passed as a 8-byte word in a GPR, either 252 the object itself or a pointer to it. */ 253 intarg_count++; 254 if (intarg_count > NUM_GPR_ARG_REGISTERS64) 255 flags |= FLAG_ARG_NEEDS_PSAVE; 256 break; 257 default: 258 FFI_ASSERT (0); 259 } 260 } 261 262 if (fparg_count != 0) 263 flags |= FLAG_FP_ARGUMENTS; 264 if (intarg_count > 4) 265 flags |= FLAG_4_GPR_ARGUMENTS; 266 267 /* Space for the FPR registers, if needed. */ 268 if (fparg_count != 0) 269 bytes += NUM_FPR_ARG_REGISTERS64 * sizeof (double); 270 271 /* Stack space. */ 272 #if _CALL_ELF == 2 273 if ((flags & FLAG_ARG_NEEDS_PSAVE) != 0) 274 bytes += intarg_count * sizeof (long); 275 #else 276 if (intarg_count > NUM_GPR_ARG_REGISTERS64) 277 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS64) * sizeof (long); 278 #endif 279 280 /* The stack space allocated needs to be a multiple of 16 bytes. */ 281 bytes = (bytes + 15) & ~0xF; 282 283 cif->flags = flags; 284 cif->bytes = bytes; 285 286 return FFI_OK; 287 } 288 289 ffi_status FFI_HIDDEN 290 ffi_prep_cif_linux64 (ffi_cif *cif) 291 { 292 if ((cif->abi & FFI_LINUX) != 0) 293 cif->nfixedargs = cif->nargs; 294 #if _CALL_ELF != 2 295 else if (cif->abi == FFI_COMPAT_LINUX64) 296 { 297 /* This call is from old code. Don't touch cif->nfixedargs 298 since old code will be using a smaller cif. */ 299 cif->flags |= FLAG_COMPAT; 300 /* Translate to new abi value. */ 301 cif->abi = FFI_LINUX | FFI_LINUX_LONG_DOUBLE_128; 302 } 303 #endif 304 else 305 return FFI_BAD_ABI; 306 return ffi_prep_cif_linux64_core (cif); 307 } 308 309 ffi_status FFI_HIDDEN 310 ffi_prep_cif_linux64_var (ffi_cif *cif, 311 unsigned int nfixedargs, 312 unsigned int ntotalargs MAYBE_UNUSED) 313 { 314 if ((cif->abi & FFI_LINUX) != 0) 315 cif->nfixedargs = nfixedargs; 316 #if _CALL_ELF != 2 317 else if (cif->abi == FFI_COMPAT_LINUX64) 318 { 319 /* This call is from old code. Don't touch cif->nfixedargs 320 since old code will be using a smaller cif. */ 321 cif->flags |= FLAG_COMPAT; 322 /* Translate to new abi value. */ 323 cif->abi = FFI_LINUX | FFI_LINUX_LONG_DOUBLE_128; 324 } 325 #endif 326 else 327 return FFI_BAD_ABI; 328 #if _CALL_ELF == 2 329 cif->flags |= FLAG_ARG_NEEDS_PSAVE; 330 #endif 331 return ffi_prep_cif_linux64_core (cif); 332 } 333 334 335 /* ffi_prep_args64 is called by the assembly routine once stack space 336 has been allocated for the function's arguments. 337 338 The stack layout we want looks like this: 339 340 | Ret addr from ffi_call_LINUX64 8bytes | higher addresses 341 |--------------------------------------------| 342 | CR save area 8bytes | 343 |--------------------------------------------| 344 | Previous backchain pointer 8 | stack pointer here 345 |--------------------------------------------|<+ <<< on entry to 346 | Saved r28-r31 4*8 | | ffi_call_LINUX64 347 |--------------------------------------------| | 348 | GPR registers r3-r10 8*8 | | 349 |--------------------------------------------| | 350 | FPR registers f1-f13 (optional) 13*8 | | 351 |--------------------------------------------| | 352 | Parameter save area | | 353 |--------------------------------------------| | 354 | TOC save area 8 | | 355 |--------------------------------------------| | stack | 356 | Linker doubleword 8 | | grows | 357 |--------------------------------------------| | down V 358 | Compiler doubleword 8 | | 359 |--------------------------------------------| | lower addresses 360 | Space for callee's LR 8 | | 361 |--------------------------------------------| | 362 | CR save area 8 | | 363 |--------------------------------------------| | stack pointer here 364 | Current backchain pointer 8 |-/ during 365 |--------------------------------------------| <<< ffi_call_LINUX64 366 367 */ 368 369 void FFI_HIDDEN 370 ffi_prep_args64 (extended_cif *ecif, unsigned long *const stack) 371 { 372 const unsigned long bytes = ecif->cif->bytes; 373 const unsigned long flags = ecif->cif->flags; 374 375 typedef union 376 { 377 char *c; 378 unsigned long *ul; 379 float *f; 380 double *d; 381 size_t p; 382 } valp; 383 384 /* 'stacktop' points at the previous backchain pointer. */ 385 valp stacktop; 386 387 /* 'next_arg' points at the space for gpr3, and grows upwards as 388 we use GPR registers, then continues at rest. */ 389 valp gpr_base; 390 valp gpr_end; 391 valp rest; 392 valp next_arg; 393 394 /* 'fpr_base' points at the space for fpr3, and grows upwards as 395 we use FPR registers. */ 396 valp fpr_base; 397 unsigned int fparg_count; 398 399 unsigned int i, words, nargs, nfixedargs; 400 ffi_type **ptr; 401 double double_tmp; 402 union 403 { 404 void **v; 405 char **c; 406 signed char **sc; 407 unsigned char **uc; 408 signed short **ss; 409 unsigned short **us; 410 signed int **si; 411 unsigned int **ui; 412 unsigned long **ul; 413 float **f; 414 double **d; 415 } p_argv; 416 unsigned long gprvalue; 417 unsigned long align; 418 419 stacktop.c = (char *) stack + bytes; 420 gpr_base.ul = stacktop.ul - ASM_NEEDS_REGISTERS64 - NUM_GPR_ARG_REGISTERS64; 421 gpr_end.ul = gpr_base.ul + NUM_GPR_ARG_REGISTERS64; 422 #if _CALL_ELF == 2 423 rest.ul = stack + 4 + NUM_GPR_ARG_REGISTERS64; 424 #else 425 rest.ul = stack + 6 + NUM_GPR_ARG_REGISTERS64; 426 #endif 427 fpr_base.d = gpr_base.d - NUM_FPR_ARG_REGISTERS64; 428 fparg_count = 0; 429 next_arg.ul = gpr_base.ul; 430 431 /* Check that everything starts aligned properly. */ 432 FFI_ASSERT (((unsigned long) (char *) stack & 0xF) == 0); 433 FFI_ASSERT (((unsigned long) stacktop.c & 0xF) == 0); 434 FFI_ASSERT ((bytes & 0xF) == 0); 435 436 /* Deal with return values that are actually pass-by-reference. */ 437 if (flags & FLAG_RETVAL_REFERENCE) 438 *next_arg.ul++ = (unsigned long) (char *) ecif->rvalue; 439 440 /* Now for the arguments. */ 441 p_argv.v = ecif->avalue; 442 nargs = ecif->cif->nargs; 443 #if _CALL_ELF != 2 444 nfixedargs = (unsigned) -1; 445 if ((flags & FLAG_COMPAT) == 0) 446 #endif 447 nfixedargs = ecif->cif->nfixedargs; 448 for (ptr = ecif->cif->arg_types, i = 0; 449 i < nargs; 450 i++, ptr++, p_argv.v++) 451 { 452 #if _CALL_ELF == 2 453 unsigned int elt, elnum; 454 #endif 455 456 switch ((*ptr)->type) 457 { 458 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 459 case FFI_TYPE_LONGDOUBLE: 460 if ((ecif->cif->abi & FFI_LINUX_LONG_DOUBLE_128) != 0) 461 { 462 double_tmp = (*p_argv.d)[0]; 463 if (fparg_count < NUM_FPR_ARG_REGISTERS64 && i < nfixedargs) 464 { 465 *fpr_base.d++ = double_tmp; 466 # if _CALL_ELF != 2 467 if ((flags & FLAG_COMPAT) != 0) 468 *next_arg.d = double_tmp; 469 # endif 470 } 471 else 472 *next_arg.d = double_tmp; 473 if (++next_arg.ul == gpr_end.ul) 474 next_arg.ul = rest.ul; 475 fparg_count++; 476 double_tmp = (*p_argv.d)[1]; 477 if (fparg_count < NUM_FPR_ARG_REGISTERS64 && i < nfixedargs) 478 { 479 *fpr_base.d++ = double_tmp; 480 # if _CALL_ELF != 2 481 if ((flags & FLAG_COMPAT) != 0) 482 *next_arg.d = double_tmp; 483 # endif 484 } 485 else 486 *next_arg.d = double_tmp; 487 if (++next_arg.ul == gpr_end.ul) 488 next_arg.ul = rest.ul; 489 fparg_count++; 490 FFI_ASSERT (__LDBL_MANT_DIG__ == 106); 491 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 492 break; 493 } 494 /* Fall through. */ 495 #endif 496 case FFI_TYPE_DOUBLE: 497 double_tmp = **p_argv.d; 498 if (fparg_count < NUM_FPR_ARG_REGISTERS64 && i < nfixedargs) 499 { 500 *fpr_base.d++ = double_tmp; 501 #if _CALL_ELF != 2 502 if ((flags & FLAG_COMPAT) != 0) 503 *next_arg.d = double_tmp; 504 #endif 505 } 506 else 507 *next_arg.d = double_tmp; 508 if (++next_arg.ul == gpr_end.ul) 509 next_arg.ul = rest.ul; 510 fparg_count++; 511 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 512 break; 513 514 case FFI_TYPE_FLOAT: 515 double_tmp = **p_argv.f; 516 if (fparg_count < NUM_FPR_ARG_REGISTERS64 && i < nfixedargs) 517 { 518 *fpr_base.d++ = double_tmp; 519 #if _CALL_ELF != 2 520 if ((flags & FLAG_COMPAT) != 0) 521 *next_arg.f = (float) double_tmp; 522 #endif 523 } 524 else 525 *next_arg.f = (float) double_tmp; 526 if (++next_arg.ul == gpr_end.ul) 527 next_arg.ul = rest.ul; 528 fparg_count++; 529 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 530 break; 531 532 case FFI_TYPE_STRUCT: 533 if ((ecif->cif->abi & FFI_LINUX_STRUCT_ALIGN) != 0) 534 { 535 align = (*ptr)->alignment; 536 if (align > 16) 537 align = 16; 538 if (align > 1) 539 next_arg.p = ALIGN (next_arg.p, align); 540 } 541 #if _CALL_ELF == 2 542 elt = discover_homogeneous_aggregate (*ptr, &elnum); 543 if (elt) 544 { 545 union { 546 void *v; 547 float *f; 548 double *d; 549 } arg; 550 551 arg.v = *p_argv.v; 552 if (elt == FFI_TYPE_FLOAT) 553 { 554 do 555 { 556 double_tmp = *arg.f++; 557 if (fparg_count < NUM_FPR_ARG_REGISTERS64 558 && i < nfixedargs) 559 *fpr_base.d++ = double_tmp; 560 else 561 *next_arg.f = (float) double_tmp; 562 if (++next_arg.f == gpr_end.f) 563 next_arg.f = rest.f; 564 fparg_count++; 565 } 566 while (--elnum != 0); 567 if ((next_arg.p & 3) != 0) 568 { 569 if (++next_arg.f == gpr_end.f) 570 next_arg.f = rest.f; 571 } 572 } 573 else 574 do 575 { 576 double_tmp = *arg.d++; 577 if (fparg_count < NUM_FPR_ARG_REGISTERS64 && i < nfixedargs) 578 *fpr_base.d++ = double_tmp; 579 else 580 *next_arg.d = double_tmp; 581 if (++next_arg.d == gpr_end.d) 582 next_arg.d = rest.d; 583 fparg_count++; 584 } 585 while (--elnum != 0); 586 } 587 else 588 #endif 589 { 590 words = ((*ptr)->size + 7) / 8; 591 if (next_arg.ul >= gpr_base.ul && next_arg.ul + words > gpr_end.ul) 592 { 593 size_t first = gpr_end.c - next_arg.c; 594 memcpy (next_arg.c, *p_argv.c, first); 595 memcpy (rest.c, *p_argv.c + first, (*ptr)->size - first); 596 next_arg.c = rest.c + words * 8 - first; 597 } 598 else 599 { 600 char *where = next_arg.c; 601 602 #ifndef __LITTLE_ENDIAN__ 603 /* Structures with size less than eight bytes are passed 604 left-padded. */ 605 if ((*ptr)->size < 8) 606 where += 8 - (*ptr)->size; 607 #endif 608 memcpy (where, *p_argv.c, (*ptr)->size); 609 next_arg.ul += words; 610 if (next_arg.ul == gpr_end.ul) 611 next_arg.ul = rest.ul; 612 } 613 } 614 break; 615 616 case FFI_TYPE_UINT8: 617 gprvalue = **p_argv.uc; 618 goto putgpr; 619 case FFI_TYPE_SINT8: 620 gprvalue = **p_argv.sc; 621 goto putgpr; 622 case FFI_TYPE_UINT16: 623 gprvalue = **p_argv.us; 624 goto putgpr; 625 case FFI_TYPE_SINT16: 626 gprvalue = **p_argv.ss; 627 goto putgpr; 628 case FFI_TYPE_UINT32: 629 gprvalue = **p_argv.ui; 630 goto putgpr; 631 case FFI_TYPE_INT: 632 case FFI_TYPE_SINT32: 633 gprvalue = **p_argv.si; 634 goto putgpr; 635 636 case FFI_TYPE_UINT64: 637 case FFI_TYPE_SINT64: 638 case FFI_TYPE_POINTER: 639 gprvalue = **p_argv.ul; 640 putgpr: 641 *next_arg.ul++ = gprvalue; 642 if (next_arg.ul == gpr_end.ul) 643 next_arg.ul = rest.ul; 644 break; 645 } 646 } 647 648 FFI_ASSERT (flags & FLAG_4_GPR_ARGUMENTS 649 || (next_arg.ul >= gpr_base.ul 650 && next_arg.ul <= gpr_base.ul + 4)); 651 } 652 653 654 #if _CALL_ELF == 2 655 #define MIN_CACHE_LINE_SIZE 8 656 657 static void 658 flush_icache (char *wraddr, char *xaddr, int size) 659 { 660 int i; 661 for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) 662 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" 663 : : "r" (xaddr + i), "r" (wraddr + i) : "memory"); 664 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" "sync;" "isync;" 665 : : "r"(xaddr + size - 1), "r"(wraddr + size - 1) 666 : "memory"); 667 } 668 #endif 669 670 ffi_status 671 ffi_prep_closure_loc_linux64 (ffi_closure *closure, 672 ffi_cif *cif, 673 void (*fun) (ffi_cif *, void *, void **, void *), 674 void *user_data, 675 void *codeloc) 676 { 677 #if _CALL_ELF == 2 678 unsigned int *tramp = (unsigned int *) &closure->tramp[0]; 679 680 if (cif->abi < FFI_LINUX || cif->abi >= FFI_LAST_ABI) 681 return FFI_BAD_ABI; 682 683 tramp[0] = 0xe96c0018; /* 0: ld 11,2f-0b(12) */ 684 tramp[1] = 0xe98c0010; /* ld 12,1f-0b(12) */ 685 tramp[2] = 0x7d8903a6; /* mtctr 12 */ 686 tramp[3] = 0x4e800420; /* bctr */ 687 /* 1: .quad function_addr */ 688 /* 2: .quad context */ 689 *(void **) &tramp[4] = (void *) ffi_closure_LINUX64; 690 *(void **) &tramp[6] = codeloc; 691 flush_icache ((char *)tramp, (char *)codeloc, FFI_TRAMPOLINE_SIZE); 692 #else 693 void **tramp = (void **) &closure->tramp[0]; 694 695 if (cif->abi < FFI_LINUX || cif->abi >= FFI_LAST_ABI) 696 return FFI_BAD_ABI; 697 698 /* Copy function address and TOC from ffi_closure_LINUX64. */ 699 memcpy (tramp, (char *) ffi_closure_LINUX64, 16); 700 tramp[2] = tramp[1]; 701 tramp[1] = codeloc; 702 #endif 703 704 closure->cif = cif; 705 closure->fun = fun; 706 closure->user_data = user_data; 707 708 return FFI_OK; 709 } 710 711 712 int FFI_HIDDEN 713 ffi_closure_helper_LINUX64 (ffi_closure *closure, void *rvalue, 714 unsigned long *pst, ffi_dblfl *pfr) 715 { 716 /* rvalue is the pointer to space for return value in closure assembly */ 717 /* pst is the pointer to parameter save area 718 (r3-r10 are stored into its first 8 slots by ffi_closure_LINUX64) */ 719 /* pfr is the pointer to where f1-f13 are stored in ffi_closure_LINUX64 */ 720 721 void **avalue; 722 ffi_type **arg_types; 723 unsigned long i, avn, nfixedargs; 724 ffi_cif *cif; 725 ffi_dblfl *end_pfr = pfr + NUM_FPR_ARG_REGISTERS64; 726 unsigned long align; 727 728 cif = closure->cif; 729 avalue = alloca (cif->nargs * sizeof (void *)); 730 731 /* Copy the caller's structure return value address so that the 732 closure returns the data directly to the caller. */ 733 if (cif->rtype->type == FFI_TYPE_STRUCT 734 && (cif->flags & FLAG_RETURNS_SMST) == 0) 735 { 736 rvalue = (void *) *pst; 737 pst++; 738 } 739 740 i = 0; 741 avn = cif->nargs; 742 #if _CALL_ELF != 2 743 nfixedargs = (unsigned) -1; 744 if ((cif->flags & FLAG_COMPAT) == 0) 745 #endif 746 nfixedargs = cif->nfixedargs; 747 arg_types = cif->arg_types; 748 749 /* Grab the addresses of the arguments from the stack frame. */ 750 while (i < avn) 751 { 752 unsigned int elt, elnum; 753 754 switch (arg_types[i]->type) 755 { 756 case FFI_TYPE_SINT8: 757 case FFI_TYPE_UINT8: 758 #ifndef __LITTLE_ENDIAN__ 759 avalue[i] = (char *) pst + 7; 760 pst++; 761 break; 762 #endif 763 764 case FFI_TYPE_SINT16: 765 case FFI_TYPE_UINT16: 766 #ifndef __LITTLE_ENDIAN__ 767 avalue[i] = (char *) pst + 6; 768 pst++; 769 break; 770 #endif 771 772 case FFI_TYPE_SINT32: 773 case FFI_TYPE_UINT32: 774 #ifndef __LITTLE_ENDIAN__ 775 avalue[i] = (char *) pst + 4; 776 pst++; 777 break; 778 #endif 779 780 case FFI_TYPE_SINT64: 781 case FFI_TYPE_UINT64: 782 case FFI_TYPE_POINTER: 783 avalue[i] = pst; 784 pst++; 785 break; 786 787 case FFI_TYPE_STRUCT: 788 if ((cif->abi & FFI_LINUX_STRUCT_ALIGN) != 0) 789 { 790 align = arg_types[i]->alignment; 791 if (align > 16) 792 align = 16; 793 if (align > 1) 794 pst = (unsigned long *) ALIGN ((size_t) pst, align); 795 } 796 elt = 0; 797 #if _CALL_ELF == 2 798 elt = discover_homogeneous_aggregate (arg_types[i], &elnum); 799 #endif 800 if (elt) 801 { 802 union { 803 void *v; 804 unsigned long *ul; 805 float *f; 806 double *d; 807 size_t p; 808 } to, from; 809 810 /* Repackage the aggregate from its parts. The 811 aggregate size is not greater than the space taken by 812 the registers so store back to the register/parameter 813 save arrays. */ 814 if (pfr + elnum <= end_pfr) 815 to.v = pfr; 816 else 817 to.v = pst; 818 819 avalue[i] = to.v; 820 from.ul = pst; 821 if (elt == FFI_TYPE_FLOAT) 822 { 823 do 824 { 825 if (pfr < end_pfr && i < nfixedargs) 826 { 827 *to.f = (float) pfr->d; 828 pfr++; 829 } 830 else 831 *to.f = *from.f; 832 to.f++; 833 from.f++; 834 } 835 while (--elnum != 0); 836 } 837 else 838 { 839 do 840 { 841 if (pfr < end_pfr && i < nfixedargs) 842 { 843 *to.d = pfr->d; 844 pfr++; 845 } 846 else 847 *to.d = *from.d; 848 to.d++; 849 from.d++; 850 } 851 while (--elnum != 0); 852 } 853 } 854 else 855 { 856 #ifndef __LITTLE_ENDIAN__ 857 /* Structures with size less than eight bytes are passed 858 left-padded. */ 859 if (arg_types[i]->size < 8) 860 avalue[i] = (char *) pst + 8 - arg_types[i]->size; 861 else 862 #endif 863 avalue[i] = pst; 864 } 865 pst += (arg_types[i]->size + 7) / 8; 866 break; 867 868 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 869 case FFI_TYPE_LONGDOUBLE: 870 if ((cif->abi & FFI_LINUX_LONG_DOUBLE_128) != 0) 871 { 872 if (pfr + 1 < end_pfr && i + 1 < nfixedargs) 873 { 874 avalue[i] = pfr; 875 pfr += 2; 876 } 877 else 878 { 879 if (pfr < end_pfr && i < nfixedargs) 880 { 881 /* Passed partly in f13 and partly on the stack. 882 Move it all to the stack. */ 883 *pst = *(unsigned long *) pfr; 884 pfr++; 885 } 886 avalue[i] = pst; 887 } 888 pst += 2; 889 break; 890 } 891 /* Fall through. */ 892 #endif 893 case FFI_TYPE_DOUBLE: 894 /* On the outgoing stack all values are aligned to 8 */ 895 /* there are 13 64bit floating point registers */ 896 897 if (pfr < end_pfr && i < nfixedargs) 898 { 899 avalue[i] = pfr; 900 pfr++; 901 } 902 else 903 avalue[i] = pst; 904 pst++; 905 break; 906 907 case FFI_TYPE_FLOAT: 908 if (pfr < end_pfr && i < nfixedargs) 909 { 910 /* Float values are stored as doubles in the 911 ffi_closure_LINUX64 code. Fix them here. */ 912 pfr->f = (float) pfr->d; 913 avalue[i] = pfr; 914 pfr++; 915 } 916 else 917 avalue[i] = pst; 918 pst++; 919 break; 920 921 default: 922 FFI_ASSERT (0); 923 } 924 925 i++; 926 } 927 928 929 (closure->fun) (cif, rvalue, avalue, closure->user_data); 930 931 /* Tell ffi_closure_LINUX64 how to perform return type promotions. */ 932 if ((cif->flags & FLAG_RETURNS_SMST) != 0) 933 { 934 if ((cif->flags & FLAG_RETURNS_FP) == 0) 935 return FFI_V2_TYPE_SMALL_STRUCT + cif->rtype->size - 1; 936 else if ((cif->flags & FLAG_RETURNS_64BITS) != 0) 937 return FFI_V2_TYPE_DOUBLE_HOMOG; 938 else 939 return FFI_V2_TYPE_FLOAT_HOMOG; 940 } 941 return cif->rtype->type; 942 } 943 #endif 944
