1 /* ----------------------------------------------------------------------- 2 ffi.c - Copyright (c) 1998 Geoffrey Keating 3 Copyright (C) 2007 Free Software Foundation, Inc 4 Copyright (C) 2008 Red Hat, Inc 5 6 PowerPC Foreign Function Interface 7 8 Permission is hereby granted, free of charge, to any person obtaining 9 a copy of this software and associated documentation files (the 10 ``Software''), to deal in the Software without restriction, including 11 without limitation the rights to use, copy, modify, merge, publish, 12 distribute, sublicense, and/or sell copies of the Software, and to 13 permit persons to whom the Software is furnished to do so, subject to 14 the following conditions: 15 16 The above copyright notice and this permission notice shall be included 17 in all copies or substantial portions of the Software. 18 19 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS 20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR 23 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 24 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 25 OTHER DEALINGS IN THE SOFTWARE. 26 ----------------------------------------------------------------------- */ 27 28 #include <ffi.h> 29 #include <ffi_common.h> 30 31 #include <stdlib.h> 32 #include <stdio.h> 33 34 35 extern void ffi_closure_SYSV (void); 36 extern void FFI_HIDDEN ffi_closure_LINUX64 (void); 37 38 enum { 39 /* The assembly depends on these exact flags. */ 40 FLAG_RETURNS_SMST = 1 << (31-31), /* Used for FFI_SYSV small structs. */ 41 FLAG_RETURNS_NOTHING = 1 << (31-30), /* These go in cr7 */ 42 FLAG_RETURNS_FP = 1 << (31-29), 43 FLAG_RETURNS_64BITS = 1 << (31-28), 44 45 FLAG_RETURNS_128BITS = 1 << (31-27), /* cr6 */ 46 47 FLAG_ARG_NEEDS_COPY = 1 << (31- 7), 48 FLAG_FP_ARGUMENTS = 1 << (31- 6), /* cr1.eq; specified by ABI */ 49 FLAG_4_GPR_ARGUMENTS = 1 << (31- 5), 50 FLAG_RETVAL_REFERENCE = 1 << (31- 4) 51 }; 52 53 /* About the SYSV ABI. */ 54 unsigned int NUM_GPR_ARG_REGISTERS = 8; 55 #ifndef __NO_FPRS__ 56 unsigned int NUM_FPR_ARG_REGISTERS = 8; 57 #else 58 unsigned int NUM_FPR_ARG_REGISTERS = 0; 59 #endif 60 61 enum { ASM_NEEDS_REGISTERS = 4 }; 62 63 /* ffi_prep_args_SYSV is called by the assembly routine once stack space 64 has been allocated for the function's arguments. 65 66 The stack layout we want looks like this: 67 68 | Return address from ffi_call_SYSV 4bytes | higher addresses 69 |--------------------------------------------| 70 | Previous backchain pointer 4 | stack pointer here 71 |--------------------------------------------|<+ <<< on entry to 72 | Saved r28-r31 4*4 | | ffi_call_SYSV 73 |--------------------------------------------| | 74 | GPR registers r3-r10 8*4 | | ffi_call_SYSV 75 |--------------------------------------------| | 76 | FPR registers f1-f8 (optional) 8*8 | | 77 |--------------------------------------------| | stack | 78 | Space for copied structures | | grows | 79 |--------------------------------------------| | down V 80 | Parameters that didn't fit in registers | | 81 |--------------------------------------------| | lower addresses 82 | Space for callee's LR 4 | | 83 |--------------------------------------------| | stack pointer here 84 | Current backchain pointer 4 |-/ during 85 |--------------------------------------------| <<< ffi_call_SYSV 86 87 */ 88 89 void 90 ffi_prep_args_SYSV (extended_cif *ecif, unsigned *const stack) 91 { 92 const unsigned bytes = ecif->cif->bytes; 93 const unsigned flags = ecif->cif->flags; 94 95 typedef union { 96 char *c; 97 unsigned *u; 98 long long *ll; 99 float *f; 100 double *d; 101 } valp; 102 103 /* 'stacktop' points at the previous backchain pointer. */ 104 valp stacktop; 105 106 /* 'gpr_base' points at the space for gpr3, and grows upwards as 107 we use GPR registers. */ 108 valp gpr_base; 109 int intarg_count; 110 111 /* 'fpr_base' points at the space for fpr1, and grows upwards as 112 we use FPR registers. */ 113 valp fpr_base; 114 int fparg_count; 115 116 /* 'copy_space' grows down as we put structures in it. It should 117 stay 16-byte aligned. */ 118 valp copy_space; 119 120 /* 'next_arg' grows up as we put parameters in it. */ 121 valp next_arg; 122 123 int i, ii MAYBE_UNUSED; 124 ffi_type **ptr; 125 double double_tmp; 126 union { 127 void **v; 128 char **c; 129 signed char **sc; 130 unsigned char **uc; 131 signed short **ss; 132 unsigned short **us; 133 unsigned int **ui; 134 long long **ll; 135 float **f; 136 double **d; 137 } p_argv; 138 size_t struct_copy_size; 139 unsigned gprvalue; 140 141 if (ecif->cif->abi == FFI_LINUX_SOFT_FLOAT) 142 NUM_FPR_ARG_REGISTERS = 0; 143 144 stacktop.c = (char *) stack + bytes; 145 gpr_base.u = stacktop.u - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS; 146 intarg_count = 0; 147 fpr_base.d = gpr_base.d - NUM_FPR_ARG_REGISTERS; 148 fparg_count = 0; 149 copy_space.c = ((flags & FLAG_FP_ARGUMENTS) ? fpr_base.c : gpr_base.c); 150 next_arg.u = stack + 2; 151 152 /* Check that everything starts aligned properly. */ 153 FFI_ASSERT (((unsigned) (char *) stack & 0xF) == 0); 154 FFI_ASSERT (((unsigned) copy_space.c & 0xF) == 0); 155 FFI_ASSERT (((unsigned) stacktop.c & 0xF) == 0); 156 FFI_ASSERT ((bytes & 0xF) == 0); 157 FFI_ASSERT (copy_space.c >= next_arg.c); 158 159 /* Deal with return values that are actually pass-by-reference. */ 160 if (flags & FLAG_RETVAL_REFERENCE) 161 { 162 *gpr_base.u++ = (unsigned long) (char *) ecif->rvalue; 163 intarg_count++; 164 } 165 166 /* Now for the arguments. */ 167 p_argv.v = ecif->avalue; 168 for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs; 169 i > 0; 170 i--, ptr++, p_argv.v++) 171 { 172 switch ((*ptr)->type) 173 { 174 case FFI_TYPE_FLOAT: 175 /* With FFI_LINUX_SOFT_FLOAT floats are handled like UINT32. */ 176 if (ecif->cif->abi == FFI_LINUX_SOFT_FLOAT) 177 goto soft_float_prep; 178 double_tmp = **p_argv.f; 179 if (fparg_count >= NUM_FPR_ARG_REGISTERS) 180 { 181 *next_arg.f = (float) double_tmp; 182 next_arg.u += 1; 183 } 184 else 185 *fpr_base.d++ = double_tmp; 186 fparg_count++; 187 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 188 break; 189 190 case FFI_TYPE_DOUBLE: 191 /* With FFI_LINUX_SOFT_FLOAT doubles are handled like UINT64. */ 192 if (ecif->cif->abi == FFI_LINUX_SOFT_FLOAT) 193 goto soft_double_prep; 194 double_tmp = **p_argv.d; 195 196 if (fparg_count >= NUM_FPR_ARG_REGISTERS) 197 { 198 if (intarg_count >= NUM_GPR_ARG_REGISTERS 199 && intarg_count % 2 != 0) 200 { 201 intarg_count++; 202 next_arg.u++; 203 } 204 *next_arg.d = double_tmp; 205 next_arg.u += 2; 206 } 207 else 208 *fpr_base.d++ = double_tmp; 209 fparg_count++; 210 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 211 break; 212 213 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 214 case FFI_TYPE_LONGDOUBLE: 215 if ((ecif->cif->abi != FFI_LINUX) 216 && (ecif->cif->abi != FFI_LINUX_SOFT_FLOAT)) 217 goto do_struct; 218 /* The soft float ABI for long doubles works like this, 219 a long double is passed in four consecutive gprs if available. 220 A maximum of 2 long doubles can be passed in gprs. 221 If we do not have 4 gprs left, the long double is passed on the 222 stack, 4-byte aligned. */ 223 if (ecif->cif->abi == FFI_LINUX_SOFT_FLOAT) 224 { 225 unsigned int int_tmp = (*p_argv.ui)[0]; 226 if (intarg_count >= NUM_GPR_ARG_REGISTERS - 3) 227 { 228 if (intarg_count < NUM_GPR_ARG_REGISTERS) 229 intarg_count += NUM_GPR_ARG_REGISTERS - intarg_count; 230 *next_arg.u = int_tmp; 231 next_arg.u++; 232 for (ii = 1; ii < 4; ii++) 233 { 234 int_tmp = (*p_argv.ui)[ii]; 235 *next_arg.u = int_tmp; 236 next_arg.u++; 237 } 238 } 239 else 240 { 241 *gpr_base.u++ = int_tmp; 242 for (ii = 1; ii < 4; ii++) 243 { 244 int_tmp = (*p_argv.ui)[ii]; 245 *gpr_base.u++ = int_tmp; 246 } 247 } 248 intarg_count +=4; 249 } 250 else 251 { 252 double_tmp = (*p_argv.d)[0]; 253 254 if (fparg_count >= NUM_FPR_ARG_REGISTERS - 1) 255 { 256 if (intarg_count >= NUM_GPR_ARG_REGISTERS 257 && intarg_count % 2 != 0) 258 { 259 intarg_count++; 260 next_arg.u++; 261 } 262 *next_arg.d = double_tmp; 263 next_arg.u += 2; 264 double_tmp = (*p_argv.d)[1]; 265 *next_arg.d = double_tmp; 266 next_arg.u += 2; 267 } 268 else 269 { 270 *fpr_base.d++ = double_tmp; 271 double_tmp = (*p_argv.d)[1]; 272 *fpr_base.d++ = double_tmp; 273 } 274 275 fparg_count += 2; 276 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 277 } 278 break; 279 #endif 280 281 case FFI_TYPE_UINT64: 282 case FFI_TYPE_SINT64: 283 soft_double_prep: 284 if (intarg_count == NUM_GPR_ARG_REGISTERS-1) 285 intarg_count++; 286 if (intarg_count >= NUM_GPR_ARG_REGISTERS) 287 { 288 if (intarg_count % 2 != 0) 289 { 290 intarg_count++; 291 next_arg.u++; 292 } 293 *next_arg.ll = **p_argv.ll; 294 next_arg.u += 2; 295 } 296 else 297 { 298 /* whoops: abi states only certain register pairs 299 * can be used for passing long long int 300 * specifically (r3,r4), (r5,r6), (r7,r8), 301 * (r9,r10) and if next arg is long long but 302 * not correct starting register of pair then skip 303 * until the proper starting register 304 */ 305 if (intarg_count % 2 != 0) 306 { 307 intarg_count ++; 308 gpr_base.u++; 309 } 310 *gpr_base.ll++ = **p_argv.ll; 311 } 312 intarg_count += 2; 313 break; 314 315 case FFI_TYPE_STRUCT: 316 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 317 do_struct: 318 #endif 319 struct_copy_size = ((*ptr)->size + 15) & ~0xF; 320 copy_space.c -= struct_copy_size; 321 memcpy (copy_space.c, *p_argv.c, (*ptr)->size); 322 323 gprvalue = (unsigned long) copy_space.c; 324 325 FFI_ASSERT (copy_space.c > next_arg.c); 326 FFI_ASSERT (flags & FLAG_ARG_NEEDS_COPY); 327 goto putgpr; 328 329 case FFI_TYPE_UINT8: 330 gprvalue = **p_argv.uc; 331 goto putgpr; 332 case FFI_TYPE_SINT8: 333 gprvalue = **p_argv.sc; 334 goto putgpr; 335 case FFI_TYPE_UINT16: 336 gprvalue = **p_argv.us; 337 goto putgpr; 338 case FFI_TYPE_SINT16: 339 gprvalue = **p_argv.ss; 340 goto putgpr; 341 342 case FFI_TYPE_INT: 343 case FFI_TYPE_UINT32: 344 case FFI_TYPE_SINT32: 345 case FFI_TYPE_POINTER: 346 soft_float_prep: 347 348 gprvalue = **p_argv.ui; 349 350 putgpr: 351 if (intarg_count >= NUM_GPR_ARG_REGISTERS) 352 *next_arg.u++ = gprvalue; 353 else 354 *gpr_base.u++ = gprvalue; 355 intarg_count++; 356 break; 357 } 358 } 359 360 /* Check that we didn't overrun the stack... */ 361 FFI_ASSERT (copy_space.c >= next_arg.c); 362 FFI_ASSERT (gpr_base.u <= stacktop.u - ASM_NEEDS_REGISTERS); 363 FFI_ASSERT (fpr_base.u 364 <= stacktop.u - ASM_NEEDS_REGISTERS - NUM_GPR_ARG_REGISTERS); 365 FFI_ASSERT (flags & FLAG_4_GPR_ARGUMENTS || intarg_count <= 4); 366 } 367 368 /* About the LINUX64 ABI. */ 369 enum { 370 NUM_GPR_ARG_REGISTERS64 = 8, 371 NUM_FPR_ARG_REGISTERS64 = 13 372 }; 373 enum { ASM_NEEDS_REGISTERS64 = 4 }; 374 375 /* ffi_prep_args64 is called by the assembly routine once stack space 376 has been allocated for the function's arguments. 377 378 The stack layout we want looks like this: 379 380 | Ret addr from ffi_call_LINUX64 8bytes | higher addresses 381 |--------------------------------------------| 382 | CR save area 8bytes | 383 |--------------------------------------------| 384 | Previous backchain pointer 8 | stack pointer here 385 |--------------------------------------------|<+ <<< on entry to 386 | Saved r28-r31 4*8 | | ffi_call_LINUX64 387 |--------------------------------------------| | 388 | GPR registers r3-r10 8*8 | | 389 |--------------------------------------------| | 390 | FPR registers f1-f13 (optional) 13*8 | | 391 |--------------------------------------------| | 392 | Parameter save area | | 393 |--------------------------------------------| | 394 | TOC save area 8 | | 395 |--------------------------------------------| | stack | 396 | Linker doubleword 8 | | grows | 397 |--------------------------------------------| | down V 398 | Compiler doubleword 8 | | 399 |--------------------------------------------| | lower addresses 400 | Space for callee's LR 8 | | 401 |--------------------------------------------| | 402 | CR save area 8 | | 403 |--------------------------------------------| | stack pointer here 404 | Current backchain pointer 8 |-/ during 405 |--------------------------------------------| <<< ffi_call_LINUX64 406 407 */ 408 409 void FFI_HIDDEN 410 ffi_prep_args64 (extended_cif *ecif, unsigned long *const stack) 411 { 412 const unsigned long bytes = ecif->cif->bytes; 413 const unsigned long flags = ecif->cif->flags; 414 415 typedef union { 416 char *c; 417 unsigned long *ul; 418 float *f; 419 double *d; 420 } valp; 421 422 /* 'stacktop' points at the previous backchain pointer. */ 423 valp stacktop; 424 425 /* 'next_arg' points at the space for gpr3, and grows upwards as 426 we use GPR registers, then continues at rest. */ 427 valp gpr_base; 428 valp gpr_end; 429 valp rest; 430 valp next_arg; 431 432 /* 'fpr_base' points at the space for fpr3, and grows upwards as 433 we use FPR registers. */ 434 valp fpr_base; 435 int fparg_count; 436 437 int i, words; 438 ffi_type **ptr; 439 double double_tmp; 440 union { 441 void **v; 442 char **c; 443 signed char **sc; 444 unsigned char **uc; 445 signed short **ss; 446 unsigned short **us; 447 signed int **si; 448 unsigned int **ui; 449 unsigned long **ul; 450 float **f; 451 double **d; 452 } p_argv; 453 unsigned long gprvalue; 454 455 stacktop.c = (char *) stack + bytes; 456 gpr_base.ul = stacktop.ul - ASM_NEEDS_REGISTERS64 - NUM_GPR_ARG_REGISTERS64; 457 gpr_end.ul = gpr_base.ul + NUM_GPR_ARG_REGISTERS64; 458 rest.ul = stack + 6 + NUM_GPR_ARG_REGISTERS64; 459 fpr_base.d = gpr_base.d - NUM_FPR_ARG_REGISTERS64; 460 fparg_count = 0; 461 next_arg.ul = gpr_base.ul; 462 463 /* Check that everything starts aligned properly. */ 464 FFI_ASSERT (((unsigned long) (char *) stack & 0xF) == 0); 465 FFI_ASSERT (((unsigned long) stacktop.c & 0xF) == 0); 466 FFI_ASSERT ((bytes & 0xF) == 0); 467 468 /* Deal with return values that are actually pass-by-reference. */ 469 if (flags & FLAG_RETVAL_REFERENCE) 470 *next_arg.ul++ = (unsigned long) (char *) ecif->rvalue; 471 472 /* Now for the arguments. */ 473 p_argv.v = ecif->avalue; 474 for (ptr = ecif->cif->arg_types, i = ecif->cif->nargs; 475 i > 0; 476 i--, ptr++, p_argv.v++) 477 { 478 switch ((*ptr)->type) 479 { 480 case FFI_TYPE_FLOAT: 481 double_tmp = **p_argv.f; 482 *next_arg.f = (float) double_tmp; 483 if (++next_arg.ul == gpr_end.ul) 484 next_arg.ul = rest.ul; 485 if (fparg_count < NUM_FPR_ARG_REGISTERS64) 486 *fpr_base.d++ = double_tmp; 487 fparg_count++; 488 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 489 break; 490 491 case FFI_TYPE_DOUBLE: 492 double_tmp = **p_argv.d; 493 *next_arg.d = double_tmp; 494 if (++next_arg.ul == gpr_end.ul) 495 next_arg.ul = rest.ul; 496 if (fparg_count < NUM_FPR_ARG_REGISTERS64) 497 *fpr_base.d++ = double_tmp; 498 fparg_count++; 499 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 500 break; 501 502 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 503 case FFI_TYPE_LONGDOUBLE: 504 double_tmp = (*p_argv.d)[0]; 505 *next_arg.d = double_tmp; 506 if (++next_arg.ul == gpr_end.ul) 507 next_arg.ul = rest.ul; 508 if (fparg_count < NUM_FPR_ARG_REGISTERS64) 509 *fpr_base.d++ = double_tmp; 510 fparg_count++; 511 double_tmp = (*p_argv.d)[1]; 512 *next_arg.d = double_tmp; 513 if (++next_arg.ul == gpr_end.ul) 514 next_arg.ul = rest.ul; 515 if (fparg_count < NUM_FPR_ARG_REGISTERS64) 516 *fpr_base.d++ = double_tmp; 517 fparg_count++; 518 FFI_ASSERT (__LDBL_MANT_DIG__ == 106); 519 FFI_ASSERT (flags & FLAG_FP_ARGUMENTS); 520 break; 521 #endif 522 523 case FFI_TYPE_STRUCT: 524 words = ((*ptr)->size + 7) / 8; 525 if (next_arg.ul >= gpr_base.ul && next_arg.ul + words > gpr_end.ul) 526 { 527 size_t first = gpr_end.c - next_arg.c; 528 memcpy (next_arg.c, *p_argv.c, first); 529 memcpy (rest.c, *p_argv.c + first, (*ptr)->size - first); 530 next_arg.c = rest.c + words * 8 - first; 531 } 532 else 533 { 534 char *where = next_arg.c; 535 536 /* Structures with size less than eight bytes are passed 537 left-padded. */ 538 if ((*ptr)->size < 8) 539 where += 8 - (*ptr)->size; 540 541 memcpy (where, *p_argv.c, (*ptr)->size); 542 next_arg.ul += words; 543 if (next_arg.ul == gpr_end.ul) 544 next_arg.ul = rest.ul; 545 } 546 break; 547 548 case FFI_TYPE_UINT8: 549 gprvalue = **p_argv.uc; 550 goto putgpr; 551 case FFI_TYPE_SINT8: 552 gprvalue = **p_argv.sc; 553 goto putgpr; 554 case FFI_TYPE_UINT16: 555 gprvalue = **p_argv.us; 556 goto putgpr; 557 case FFI_TYPE_SINT16: 558 gprvalue = **p_argv.ss; 559 goto putgpr; 560 case FFI_TYPE_UINT32: 561 gprvalue = **p_argv.ui; 562 goto putgpr; 563 case FFI_TYPE_INT: 564 case FFI_TYPE_SINT32: 565 gprvalue = **p_argv.si; 566 goto putgpr; 567 568 case FFI_TYPE_UINT64: 569 case FFI_TYPE_SINT64: 570 case FFI_TYPE_POINTER: 571 gprvalue = **p_argv.ul; 572 putgpr: 573 *next_arg.ul++ = gprvalue; 574 if (next_arg.ul == gpr_end.ul) 575 next_arg.ul = rest.ul; 576 break; 577 } 578 } 579 580 FFI_ASSERT (flags & FLAG_4_GPR_ARGUMENTS 581 || (next_arg.ul >= gpr_base.ul 582 && next_arg.ul <= gpr_base.ul + 4)); 583 } 584 585 586 587 /* Perform machine dependent cif processing */ 588 ffi_status 589 ffi_prep_cif_machdep (ffi_cif *cif) 590 { 591 /* All this is for the SYSV and LINUX64 ABI. */ 592 int i; 593 ffi_type **ptr; 594 unsigned bytes; 595 int fparg_count = 0, intarg_count = 0; 596 unsigned flags = 0; 597 unsigned struct_copy_size = 0; 598 unsigned type = cif->rtype->type; 599 unsigned size = cif->rtype->size; 600 601 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 602 NUM_FPR_ARG_REGISTERS = 0; 603 604 if (cif->abi != FFI_LINUX64) 605 { 606 /* All the machine-independent calculation of cif->bytes will be wrong. 607 Redo the calculation for SYSV. */ 608 609 /* Space for the frame pointer, callee's LR, and the asm's temp regs. */ 610 bytes = (2 + ASM_NEEDS_REGISTERS) * sizeof (int); 611 612 /* Space for the GPR registers. */ 613 bytes += NUM_GPR_ARG_REGISTERS * sizeof (int); 614 } 615 else 616 { 617 /* 64-bit ABI. */ 618 619 /* Space for backchain, CR, LR, cc/ld doubleword, TOC and the asm's temp 620 regs. */ 621 bytes = (6 + ASM_NEEDS_REGISTERS64) * sizeof (long); 622 623 /* Space for the mandatory parm save area and general registers. */ 624 bytes += 2 * NUM_GPR_ARG_REGISTERS64 * sizeof (long); 625 } 626 627 /* Return value handling. The rules for SYSV are as follows: 628 - 32-bit (or less) integer values are returned in gpr3; 629 - Structures of size <= 4 bytes also returned in gpr3; 630 - 64-bit integer values and structures between 5 and 8 bytes are returned 631 in gpr3 and gpr4; 632 - Single/double FP values are returned in fpr1; 633 - Larger structures are allocated space and a pointer is passed as 634 the first argument. 635 - long doubles (if not equivalent to double) are returned in 636 fpr1,fpr2 for Linux and as for large structs for SysV. 637 For LINUX64: 638 - integer values in gpr3; 639 - Structures/Unions by reference; 640 - Single/double FP values in fpr1, long double in fpr1,fpr2. 641 - soft-float float/doubles are treated as UINT32/UINT64 respectivley. 642 - soft-float long doubles are returned in gpr3-gpr6. */ 643 switch (type) 644 { 645 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 646 case FFI_TYPE_LONGDOUBLE: 647 if (cif->abi != FFI_LINUX && cif->abi != FFI_LINUX64 648 && cif->abi != FFI_LINUX_SOFT_FLOAT) 649 goto byref; 650 flags |= FLAG_RETURNS_128BITS; 651 /* Fall through. */ 652 #endif 653 case FFI_TYPE_DOUBLE: 654 flags |= FLAG_RETURNS_64BITS; 655 /* Fall through. */ 656 case FFI_TYPE_FLOAT: 657 /* With FFI_LINUX_SOFT_FLOAT no fp registers are used. */ 658 if (cif->abi != FFI_LINUX_SOFT_FLOAT) 659 flags |= FLAG_RETURNS_FP; 660 break; 661 662 case FFI_TYPE_UINT64: 663 case FFI_TYPE_SINT64: 664 flags |= FLAG_RETURNS_64BITS; 665 break; 666 667 case FFI_TYPE_STRUCT: 668 if (cif->abi == FFI_SYSV) 669 { 670 /* The final SYSV ABI says that structures smaller or equal 8 bytes 671 are returned in r3/r4. The FFI_GCC_SYSV ABI instead returns them 672 in memory. */ 673 674 /* Treat structs with size <= 8 bytes. */ 675 if (size <= 8) 676 { 677 flags |= FLAG_RETURNS_SMST; 678 /* These structs are returned in r3. We pack the type and the 679 precalculated shift value (needed in the sysv.S) into flags. 680 The same applies for the structs returned in r3/r4. */ 681 if (size <= 4) 682 { 683 flags |= 1 << (31 - FFI_SYSV_TYPE_SMALL_STRUCT - 1); 684 flags |= 8 * (4 - size) << 4; 685 break; 686 } 687 /* These structs are returned in r3 and r4. See above. */ 688 if (size <= 8) 689 { 690 flags |= 1 << (31 - FFI_SYSV_TYPE_SMALL_STRUCT - 2); 691 flags |= 8 * (8 - size) << 4; 692 break; 693 } 694 } 695 } 696 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 697 byref: 698 #endif 699 intarg_count++; 700 flags |= FLAG_RETVAL_REFERENCE; 701 /* Fall through. */ 702 case FFI_TYPE_VOID: 703 flags |= FLAG_RETURNS_NOTHING; 704 break; 705 706 default: 707 /* Returns 32-bit integer, or similar. Nothing to do here. */ 708 break; 709 } 710 711 if (cif->abi != FFI_LINUX64) 712 /* The first NUM_GPR_ARG_REGISTERS words of integer arguments, and the 713 first NUM_FPR_ARG_REGISTERS fp arguments, go in registers; the rest 714 goes on the stack. Structures and long doubles (if not equivalent 715 to double) are passed as a pointer to a copy of the structure. 716 Stuff on the stack needs to keep proper alignment. */ 717 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) 718 { 719 switch ((*ptr)->type) 720 { 721 case FFI_TYPE_FLOAT: 722 /* With FFI_LINUX_SOFT_FLOAT floats are handled like UINT32. */ 723 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 724 goto soft_float_cif; 725 fparg_count++; 726 /* floating singles are not 8-aligned on stack */ 727 break; 728 729 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 730 case FFI_TYPE_LONGDOUBLE: 731 if (cif->abi != FFI_LINUX && cif->abi != FFI_LINUX_SOFT_FLOAT) 732 goto do_struct; 733 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 734 { 735 if (intarg_count >= NUM_GPR_ARG_REGISTERS - 3 736 || intarg_count < NUM_GPR_ARG_REGISTERS) 737 /* A long double in FFI_LINUX_SOFT_FLOAT can use only 738 a set of four consecutive gprs. If we have not enough, 739 we have to adjust the intarg_count value. */ 740 intarg_count += NUM_GPR_ARG_REGISTERS - intarg_count; 741 intarg_count += 4; 742 break; 743 } 744 else 745 fparg_count++; 746 /* Fall thru */ 747 #endif 748 case FFI_TYPE_DOUBLE: 749 /* With FFI_LINUX_SOFT_FLOAT doubles are handled like UINT64. */ 750 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 751 goto soft_double_cif; 752 fparg_count++; 753 /* If this FP arg is going on the stack, it must be 754 8-byte-aligned. */ 755 if (fparg_count > NUM_FPR_ARG_REGISTERS 756 && intarg_count >= NUM_GPR_ARG_REGISTERS 757 && intarg_count % 2 != 0) 758 intarg_count++; 759 break; 760 761 case FFI_TYPE_UINT64: 762 case FFI_TYPE_SINT64: 763 soft_double_cif: 764 /* 'long long' arguments are passed as two words, but 765 either both words must fit in registers or both go 766 on the stack. If they go on the stack, they must 767 be 8-byte-aligned. 768 769 Also, only certain register pairs can be used for 770 passing long long int -- specifically (r3,r4), (r5,r6), 771 (r7,r8), (r9,r10). 772 */ 773 if (intarg_count == NUM_GPR_ARG_REGISTERS-1 774 || intarg_count % 2 != 0) 775 intarg_count++; 776 intarg_count += 2; 777 break; 778 779 case FFI_TYPE_STRUCT: 780 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 781 do_struct: 782 #endif 783 /* We must allocate space for a copy of these to enforce 784 pass-by-value. Pad the space up to a multiple of 16 785 bytes (the maximum alignment required for anything under 786 the SYSV ABI). */ 787 struct_copy_size += ((*ptr)->size + 15) & ~0xF; 788 /* Fall through (allocate space for the pointer). */ 789 790 default: 791 soft_float_cif: 792 /* Everything else is passed as a 4-byte word in a GPR, either 793 the object itself or a pointer to it. */ 794 intarg_count++; 795 break; 796 } 797 } 798 else 799 for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) 800 { 801 switch ((*ptr)->type) 802 { 803 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 804 case FFI_TYPE_LONGDOUBLE: 805 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 806 intarg_count += 4; 807 else 808 { 809 fparg_count += 2; 810 intarg_count += 2; 811 } 812 break; 813 #endif 814 case FFI_TYPE_FLOAT: 815 case FFI_TYPE_DOUBLE: 816 fparg_count++; 817 intarg_count++; 818 break; 819 820 case FFI_TYPE_STRUCT: 821 intarg_count += ((*ptr)->size + 7) / 8; 822 break; 823 824 default: 825 /* Everything else is passed as a 8-byte word in a GPR, either 826 the object itself or a pointer to it. */ 827 intarg_count++; 828 break; 829 } 830 } 831 832 if (fparg_count != 0) 833 flags |= FLAG_FP_ARGUMENTS; 834 if (intarg_count > 4) 835 flags |= FLAG_4_GPR_ARGUMENTS; 836 if (struct_copy_size != 0) 837 flags |= FLAG_ARG_NEEDS_COPY; 838 839 if (cif->abi != FFI_LINUX64) 840 { 841 /* Space for the FPR registers, if needed. */ 842 if (fparg_count != 0) 843 bytes += NUM_FPR_ARG_REGISTERS * sizeof (double); 844 845 /* Stack space. */ 846 if (intarg_count > NUM_GPR_ARG_REGISTERS) 847 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS) * sizeof (int); 848 if (fparg_count > NUM_FPR_ARG_REGISTERS) 849 bytes += (fparg_count - NUM_FPR_ARG_REGISTERS) * sizeof (double); 850 } 851 else 852 { 853 /* Space for the FPR registers, if needed. */ 854 if (fparg_count != 0) 855 bytes += NUM_FPR_ARG_REGISTERS64 * sizeof (double); 856 857 /* Stack space. */ 858 if (intarg_count > NUM_GPR_ARG_REGISTERS64) 859 bytes += (intarg_count - NUM_GPR_ARG_REGISTERS64) * sizeof (long); 860 } 861 862 /* The stack space allocated needs to be a multiple of 16 bytes. */ 863 bytes = (bytes + 15) & ~0xF; 864 865 /* Add in the space for the copied structures. */ 866 bytes += struct_copy_size; 867 868 cif->flags = flags; 869 cif->bytes = bytes; 870 871 return FFI_OK; 872 } 873 874 extern void ffi_call_SYSV(extended_cif *, unsigned, unsigned, unsigned *, 875 void (*fn)(void)); 876 extern void FFI_HIDDEN ffi_call_LINUX64(extended_cif *, unsigned long, 877 unsigned long, unsigned long *, 878 void (*fn)(void)); 879 880 void 881 ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) 882 { 883 extended_cif ecif; 884 885 ecif.cif = cif; 886 ecif.avalue = avalue; 887 888 /* If the return value is a struct and we don't have a return */ 889 /* value address then we need to make one */ 890 891 if ((rvalue == NULL) && (cif->rtype->type == FFI_TYPE_STRUCT)) 892 { 893 ecif.rvalue = alloca(cif->rtype->size); 894 } 895 else 896 ecif.rvalue = rvalue; 897 898 899 switch (cif->abi) 900 { 901 #ifndef POWERPC64 902 case FFI_SYSV: 903 case FFI_GCC_SYSV: 904 case FFI_LINUX: 905 case FFI_LINUX_SOFT_FLOAT: 906 ffi_call_SYSV (&ecif, -cif->bytes, cif->flags, ecif.rvalue, fn); 907 break; 908 #else 909 case FFI_LINUX64: 910 ffi_call_LINUX64 (&ecif, -(long) cif->bytes, cif->flags, ecif.rvalue, fn); 911 break; 912 #endif 913 default: 914 FFI_ASSERT (0); 915 break; 916 } 917 } 918 919 920 #ifndef POWERPC64 921 #define MIN_CACHE_LINE_SIZE 8 922 923 static void 924 flush_icache (char *wraddr, char *xaddr, int size) 925 { 926 int i; 927 for (i = 0; i < size; i += MIN_CACHE_LINE_SIZE) 928 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" 929 : : "r" (xaddr + i), "r" (wraddr + i) : "memory"); 930 __asm__ volatile ("icbi 0,%0;" "dcbf 0,%1;" "sync;" "isync;" 931 : : "r"(xaddr + size - 1), "r"(wraddr + size - 1) 932 : "memory"); 933 } 934 #endif 935 936 ffi_status 937 ffi_prep_closure_loc (ffi_closure *closure, 938 ffi_cif *cif, 939 void (*fun) (ffi_cif *, void *, void **, void *), 940 void *user_data, 941 void *codeloc) 942 { 943 #ifdef POWERPC64 944 void **tramp = (void **) &closure->tramp[0]; 945 946 FFI_ASSERT (cif->abi == FFI_LINUX64); 947 /* Copy function address and TOC from ffi_closure_LINUX64. */ 948 memcpy (tramp, (char *) ffi_closure_LINUX64, 16); 949 tramp[2] = codeloc; 950 #else 951 unsigned int *tramp; 952 953 FFI_ASSERT (cif->abi == FFI_GCC_SYSV || cif->abi == FFI_SYSV); 954 955 tramp = (unsigned int *) &closure->tramp[0]; 956 tramp[0] = 0x7c0802a6; /* mflr r0 */ 957 tramp[1] = 0x4800000d; /* bl 10 <trampoline_initial+0x10> */ 958 tramp[4] = 0x7d6802a6; /* mflr r11 */ 959 tramp[5] = 0x7c0803a6; /* mtlr r0 */ 960 tramp[6] = 0x800b0000; /* lwz r0,0(r11) */ 961 tramp[7] = 0x816b0004; /* lwz r11,4(r11) */ 962 tramp[8] = 0x7c0903a6; /* mtctr r0 */ 963 tramp[9] = 0x4e800420; /* bctr */ 964 *(void **) &tramp[2] = (void *) ffi_closure_SYSV; /* function */ 965 *(void **) &tramp[3] = codeloc; /* context */ 966 967 /* Flush the icache. */ 968 flush_icache ((char *)tramp, (char *)codeloc, FFI_TRAMPOLINE_SIZE); 969 #endif 970 971 closure->cif = cif; 972 closure->fun = fun; 973 closure->user_data = user_data; 974 975 return FFI_OK; 976 } 977 978 typedef union 979 { 980 float f; 981 double d; 982 } ffi_dblfl; 983 984 int ffi_closure_helper_SYSV (ffi_closure *, void *, unsigned long *, 985 ffi_dblfl *, unsigned long *); 986 987 /* Basically the trampoline invokes ffi_closure_SYSV, and on 988 * entry, r11 holds the address of the closure. 989 * After storing the registers that could possibly contain 990 * parameters to be passed into the stack frame and setting 991 * up space for a return value, ffi_closure_SYSV invokes the 992 * following helper function to do most of the work 993 */ 994 995 int 996 ffi_closure_helper_SYSV (ffi_closure *closure, void *rvalue, 997 unsigned long *pgr, ffi_dblfl *pfr, 998 unsigned long *pst) 999 { 1000 /* rvalue is the pointer to space for return value in closure assembly */ 1001 /* pgr is the pointer to where r3-r10 are stored in ffi_closure_SYSV */ 1002 /* pfr is the pointer to where f1-f8 are stored in ffi_closure_SYSV */ 1003 /* pst is the pointer to outgoing parameter stack in original caller */ 1004 1005 void ** avalue; 1006 ffi_type ** arg_types; 1007 long i, avn; 1008 long nf; /* number of floating registers already used */ 1009 long ng; /* number of general registers already used */ 1010 ffi_cif * cif; 1011 double temp; 1012 unsigned size; 1013 1014 cif = closure->cif; 1015 avalue = alloca (cif->nargs * sizeof (void *)); 1016 size = cif->rtype->size; 1017 1018 nf = 0; 1019 ng = 0; 1020 1021 /* Copy the caller's structure return value address so that the closure 1022 returns the data directly to the caller. 1023 For FFI_SYSV the result is passed in r3/r4 if the struct size is less 1024 or equal 8 bytes. */ 1025 1026 if ((cif->rtype->type == FFI_TYPE_STRUCT 1027 && !((cif->abi == FFI_SYSV) && (size <= 8))) 1028 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1029 || (cif->rtype->type == FFI_TYPE_LONGDOUBLE 1030 && cif->abi != FFI_LINUX && cif->abi != FFI_LINUX_SOFT_FLOAT) 1031 #endif 1032 ) 1033 { 1034 rvalue = (void *) *pgr; 1035 ng++; 1036 pgr++; 1037 } 1038 1039 i = 0; 1040 avn = cif->nargs; 1041 arg_types = cif->arg_types; 1042 1043 /* Grab the addresses of the arguments from the stack frame. */ 1044 while (i < avn) 1045 { 1046 switch (arg_types[i]->type) 1047 { 1048 case FFI_TYPE_SINT8: 1049 case FFI_TYPE_UINT8: 1050 /* there are 8 gpr registers used to pass values */ 1051 if (ng < 8) 1052 { 1053 avalue[i] = (char *) pgr + 3; 1054 ng++; 1055 pgr++; 1056 } 1057 else 1058 { 1059 avalue[i] = (char *) pst + 3; 1060 pst++; 1061 } 1062 break; 1063 1064 case FFI_TYPE_SINT16: 1065 case FFI_TYPE_UINT16: 1066 /* there are 8 gpr registers used to pass values */ 1067 if (ng < 8) 1068 { 1069 avalue[i] = (char *) pgr + 2; 1070 ng++; 1071 pgr++; 1072 } 1073 else 1074 { 1075 avalue[i] = (char *) pst + 2; 1076 pst++; 1077 } 1078 break; 1079 1080 case FFI_TYPE_SINT32: 1081 case FFI_TYPE_UINT32: 1082 case FFI_TYPE_POINTER: 1083 soft_float_closure: 1084 /* there are 8 gpr registers used to pass values */ 1085 if (ng < 8) 1086 { 1087 avalue[i] = pgr; 1088 ng++; 1089 pgr++; 1090 } 1091 else 1092 { 1093 avalue[i] = pst; 1094 pst++; 1095 } 1096 break; 1097 1098 case FFI_TYPE_STRUCT: 1099 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1100 do_struct: 1101 #endif 1102 /* Structs are passed by reference. The address will appear in a 1103 gpr if it is one of the first 8 arguments. */ 1104 if (ng < 8) 1105 { 1106 avalue[i] = (void *) *pgr; 1107 ng++; 1108 pgr++; 1109 } 1110 else 1111 { 1112 avalue[i] = (void *) *pst; 1113 pst++; 1114 } 1115 break; 1116 1117 case FFI_TYPE_SINT64: 1118 case FFI_TYPE_UINT64: 1119 soft_double_closure: 1120 /* passing long long ints are complex, they must 1121 * be passed in suitable register pairs such as 1122 * (r3,r4) or (r5,r6) or (r6,r7), or (r7,r8) or (r9,r10) 1123 * and if the entire pair aren't available then the outgoing 1124 * parameter stack is used for both but an alignment of 8 1125 * must will be kept. So we must either look in pgr 1126 * or pst to find the correct address for this type 1127 * of parameter. 1128 */ 1129 if (ng < 7) 1130 { 1131 if (ng & 0x01) 1132 { 1133 /* skip r4, r6, r8 as starting points */ 1134 ng++; 1135 pgr++; 1136 } 1137 avalue[i] = pgr; 1138 ng += 2; 1139 pgr += 2; 1140 } 1141 else 1142 { 1143 if (((long) pst) & 4) 1144 pst++; 1145 avalue[i] = pst; 1146 pst += 2; 1147 } 1148 break; 1149 1150 case FFI_TYPE_FLOAT: 1151 /* With FFI_LINUX_SOFT_FLOAT floats are handled like UINT32. */ 1152 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 1153 goto soft_float_closure; 1154 /* unfortunately float values are stored as doubles 1155 * in the ffi_closure_SYSV code (since we don't check 1156 * the type in that routine). 1157 */ 1158 1159 /* there are 8 64bit floating point registers */ 1160 1161 if (nf < 8) 1162 { 1163 temp = pfr->d; 1164 pfr->f = (float) temp; 1165 avalue[i] = pfr; 1166 nf++; 1167 pfr++; 1168 } 1169 else 1170 { 1171 /* FIXME? here we are really changing the values 1172 * stored in the original calling routines outgoing 1173 * parameter stack. This is probably a really 1174 * naughty thing to do but... 1175 */ 1176 avalue[i] = pst; 1177 pst += 1; 1178 } 1179 break; 1180 1181 case FFI_TYPE_DOUBLE: 1182 /* With FFI_LINUX_SOFT_FLOAT doubles are handled like UINT64. */ 1183 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 1184 goto soft_double_closure; 1185 /* On the outgoing stack all values are aligned to 8 */ 1186 /* there are 8 64bit floating point registers */ 1187 1188 if (nf < 8) 1189 { 1190 avalue[i] = pfr; 1191 nf++; 1192 pfr++; 1193 } 1194 else 1195 { 1196 if (((long) pst) & 4) 1197 pst++; 1198 avalue[i] = pst; 1199 pst += 2; 1200 } 1201 break; 1202 1203 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1204 case FFI_TYPE_LONGDOUBLE: 1205 if (cif->abi != FFI_LINUX && cif->abi != FFI_LINUX_SOFT_FLOAT) 1206 goto do_struct; 1207 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 1208 { /* Test if for the whole long double, 4 gprs are available. 1209 otherwise the stuff ends up on the stack. */ 1210 if (ng < 5) 1211 { 1212 avalue[i] = pgr; 1213 pgr += 4; 1214 ng += 4; 1215 } 1216 else 1217 { 1218 avalue[i] = pst; 1219 pst += 4; 1220 } 1221 break; 1222 } 1223 if (nf < 7) 1224 { 1225 avalue[i] = pfr; 1226 pfr += 2; 1227 nf += 2; 1228 } 1229 else 1230 { 1231 if (((long) pst) & 4) 1232 pst++; 1233 avalue[i] = pst; 1234 pst += 4; 1235 nf = 8; 1236 } 1237 break; 1238 #endif 1239 1240 default: 1241 FFI_ASSERT (0); 1242 } 1243 1244 i++; 1245 } 1246 1247 1248 (closure->fun) (cif, rvalue, avalue, closure->user_data); 1249 1250 /* Tell ffi_closure_SYSV how to perform return type promotions. 1251 Because the FFI_SYSV ABI returns the structures <= 8 bytes in r3/r4 1252 we have to tell ffi_closure_SYSV how to treat them. */ 1253 if (cif->abi == FFI_SYSV && cif->rtype->type == FFI_TYPE_STRUCT 1254 && size <= 8) 1255 return FFI_SYSV_TYPE_SMALL_STRUCT + size; 1256 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1257 else if (cif->rtype->type == FFI_TYPE_LONGDOUBLE 1258 && cif->abi != FFI_LINUX && cif->abi != FFI_LINUX_SOFT_FLOAT) 1259 return FFI_TYPE_STRUCT; 1260 #endif 1261 /* With FFI_LINUX_SOFT_FLOAT floats and doubles are handled like UINT32 1262 respectivley UINT64. */ 1263 if (cif->abi == FFI_LINUX_SOFT_FLOAT) 1264 { 1265 switch (cif->rtype->type) 1266 { 1267 case FFI_TYPE_FLOAT: 1268 return FFI_TYPE_UINT32; 1269 break; 1270 case FFI_TYPE_DOUBLE: 1271 return FFI_TYPE_UINT64; 1272 break; 1273 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1274 case FFI_TYPE_LONGDOUBLE: 1275 return FFI_TYPE_UINT128; 1276 break; 1277 #endif 1278 default: 1279 return cif->rtype->type; 1280 } 1281 } 1282 else 1283 { 1284 return cif->rtype->type; 1285 } 1286 } 1287 1288 int FFI_HIDDEN ffi_closure_helper_LINUX64 (ffi_closure *, void *, 1289 unsigned long *, ffi_dblfl *); 1290 1291 int FFI_HIDDEN 1292 ffi_closure_helper_LINUX64 (ffi_closure *closure, void *rvalue, 1293 unsigned long *pst, ffi_dblfl *pfr) 1294 { 1295 /* rvalue is the pointer to space for return value in closure assembly */ 1296 /* pst is the pointer to parameter save area 1297 (r3-r10 are stored into its first 8 slots by ffi_closure_LINUX64) */ 1298 /* pfr is the pointer to where f1-f13 are stored in ffi_closure_LINUX64 */ 1299 1300 void **avalue; 1301 ffi_type **arg_types; 1302 long i, avn; 1303 ffi_cif *cif; 1304 ffi_dblfl *end_pfr = pfr + NUM_FPR_ARG_REGISTERS64; 1305 1306 cif = closure->cif; 1307 avalue = alloca (cif->nargs * sizeof (void *)); 1308 1309 /* Copy the caller's structure return value address so that the closure 1310 returns the data directly to the caller. */ 1311 if (cif->rtype->type == FFI_TYPE_STRUCT) 1312 { 1313 rvalue = (void *) *pst; 1314 pst++; 1315 } 1316 1317 i = 0; 1318 avn = cif->nargs; 1319 arg_types = cif->arg_types; 1320 1321 /* Grab the addresses of the arguments from the stack frame. */ 1322 while (i < avn) 1323 { 1324 switch (arg_types[i]->type) 1325 { 1326 case FFI_TYPE_SINT8: 1327 case FFI_TYPE_UINT8: 1328 avalue[i] = (char *) pst + 7; 1329 pst++; 1330 break; 1331 1332 case FFI_TYPE_SINT16: 1333 case FFI_TYPE_UINT16: 1334 avalue[i] = (char *) pst + 6; 1335 pst++; 1336 break; 1337 1338 case FFI_TYPE_SINT32: 1339 case FFI_TYPE_UINT32: 1340 avalue[i] = (char *) pst + 4; 1341 pst++; 1342 break; 1343 1344 case FFI_TYPE_SINT64: 1345 case FFI_TYPE_UINT64: 1346 case FFI_TYPE_POINTER: 1347 avalue[i] = pst; 1348 pst++; 1349 break; 1350 1351 case FFI_TYPE_STRUCT: 1352 /* Structures with size less than eight bytes are passed 1353 left-padded. */ 1354 if (arg_types[i]->size < 8) 1355 avalue[i] = (char *) pst + 8 - arg_types[i]->size; 1356 else 1357 avalue[i] = pst; 1358 pst += (arg_types[i]->size + 7) / 8; 1359 break; 1360 1361 case FFI_TYPE_FLOAT: 1362 /* unfortunately float values are stored as doubles 1363 * in the ffi_closure_LINUX64 code (since we don't check 1364 * the type in that routine). 1365 */ 1366 1367 /* there are 13 64bit floating point registers */ 1368 1369 if (pfr < end_pfr) 1370 { 1371 double temp = pfr->d; 1372 pfr->f = (float) temp; 1373 avalue[i] = pfr; 1374 pfr++; 1375 } 1376 else 1377 avalue[i] = pst; 1378 pst++; 1379 break; 1380 1381 case FFI_TYPE_DOUBLE: 1382 /* On the outgoing stack all values are aligned to 8 */ 1383 /* there are 13 64bit floating point registers */ 1384 1385 if (pfr < end_pfr) 1386 { 1387 avalue[i] = pfr; 1388 pfr++; 1389 } 1390 else 1391 avalue[i] = pst; 1392 pst++; 1393 break; 1394 1395 #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE 1396 case FFI_TYPE_LONGDOUBLE: 1397 if (pfr + 1 < end_pfr) 1398 { 1399 avalue[i] = pfr; 1400 pfr += 2; 1401 } 1402 else 1403 { 1404 if (pfr < end_pfr) 1405 { 1406 /* Passed partly in f13 and partly on the stack. 1407 Move it all to the stack. */ 1408 *pst = *(unsigned long *) pfr; 1409 pfr++; 1410 } 1411 avalue[i] = pst; 1412 } 1413 pst += 2; 1414 break; 1415 #endif 1416 1417 default: 1418 FFI_ASSERT (0); 1419 } 1420 1421 i++; 1422 } 1423 1424 1425 (closure->fun) (cif, rvalue, avalue, closure->user_data); 1426 1427 /* Tell ffi_closure_LINUX64 how to perform return type promotions. */ 1428 return cif->rtype->type; 1429 } 1430
