Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 1 | /* ----------------------------------------------------------------------- |
| 2 | ffi.c - Copyright (c) 1996, 1998, 1999, 2001, 2007, 2008 Red Hat, Inc. |
| 3 | Copyright (c) 2002 Ranjit Mathew |
| 4 | Copyright (c) 2002 Bo Thorsen |
| 5 | Copyright (c) 2002 Roger Sayle |
| 6 | Copyright (C) 2008 Free Software Foundation, Inc. |
| 7 | |
| 8 | x86 Foreign Function Interface |
| 9 | |
| 10 | Permission is hereby granted, free of charge, to any person obtaining |
| 11 | a copy of this software and associated documentation files (the |
| 12 | ``Software''), to deal in the Software without restriction, including |
| 13 | without limitation the rights to use, copy, modify, merge, publish, |
| 14 | distribute, sublicense, and/or sell copies of the Software, and to |
| 15 | permit persons to whom the Software is furnished to do so, subject to |
| 16 | the following conditions: |
| 17 | |
| 18 | The above copyright notice and this permission notice shall be included |
| 19 | in all copies or substantial portions of the Software. |
| 20 | |
| 21 | THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, |
| 22 | EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 23 | MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 24 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| 25 | HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| 26 | WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 27 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 28 | DEALINGS IN THE SOFTWARE. |
| 29 | ----------------------------------------------------------------------- */ |
| 30 | |
| 31 | #if !defined(__x86_64__) || defined(_WIN64) |
| 32 | |
| 33 | #ifdef _WIN64 |
| 34 | #include <windows.h> |
| 35 | #endif |
| 36 | |
| 37 | #include <ffi.h> |
| 38 | #include <ffi_common.h> |
| 39 | |
| 40 | #include <stdlib.h> |
| 41 | |
| 42 | /* ffi_prep_args is called by the assembly routine once stack space |
| 43 | has been allocated for the function's arguments */ |
| 44 | |
| 45 | void ffi_prep_args(char *stack, extended_cif *ecif) |
| 46 | { |
| 47 | register unsigned int i; |
| 48 | register void **p_argv; |
| 49 | register char *argp; |
| 50 | register ffi_type **p_arg; |
| 51 | |
| 52 | argp = stack; |
| 53 | |
| 54 | if (ecif->cif->flags == FFI_TYPE_STRUCT |
| 55 | #ifdef X86_WIN64 |
| 56 | && (ecif->cif->rtype->size != 1 && ecif->cif->rtype->size != 2 |
| 57 | && ecif->cif->rtype->size != 4 && ecif->cif->rtype->size != 8) |
| 58 | #endif |
| 59 | ) |
| 60 | { |
| 61 | *(void **) argp = ecif->rvalue; |
| 62 | argp += sizeof(void*); |
| 63 | } |
| 64 | |
| 65 | p_argv = ecif->avalue; |
| 66 | |
| 67 | for (i = ecif->cif->nargs, p_arg = ecif->cif->arg_types; |
| 68 | i != 0; |
| 69 | i--, p_arg++) |
| 70 | { |
| 71 | size_t z; |
| 72 | |
| 73 | /* Align if necessary */ |
| 74 | if ((sizeof(void*) - 1) & (size_t) argp) |
| 75 | argp = (char *) ALIGN(argp, sizeof(void*)); |
| 76 | |
| 77 | z = (*p_arg)->size; |
| 78 | #ifdef X86_WIN64 |
| 79 | if (z > sizeof(ffi_arg) |
| 80 | || ((*p_arg)->type == FFI_TYPE_STRUCT |
| 81 | && (z != 1 && z != 2 && z != 4 && z != 8)) |
| 82 | #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE |
| 83 | || ((*p_arg)->type == FFI_TYPE_LONGDOUBLE) |
| 84 | #endif |
| 85 | ) |
| 86 | { |
| 87 | z = sizeof(ffi_arg); |
| 88 | *(void **)argp = *p_argv; |
| 89 | } |
| 90 | else if ((*p_arg)->type == FFI_TYPE_FLOAT) |
| 91 | { |
| 92 | memcpy(argp, *p_argv, z); |
| 93 | } |
| 94 | else |
| 95 | #endif |
| 96 | if (z < sizeof(ffi_arg)) |
| 97 | { |
| 98 | z = sizeof(ffi_arg); |
| 99 | switch ((*p_arg)->type) |
| 100 | { |
| 101 | case FFI_TYPE_SINT8: |
| 102 | *(ffi_sarg *) argp = (ffi_sarg)*(SINT8 *)(* p_argv); |
| 103 | break; |
| 104 | |
| 105 | case FFI_TYPE_UINT8: |
| 106 | *(ffi_arg *) argp = (ffi_arg)*(UINT8 *)(* p_argv); |
| 107 | break; |
| 108 | |
| 109 | case FFI_TYPE_SINT16: |
| 110 | *(ffi_sarg *) argp = (ffi_sarg)*(SINT16 *)(* p_argv); |
| 111 | break; |
| 112 | |
| 113 | case FFI_TYPE_UINT16: |
| 114 | *(ffi_arg *) argp = (ffi_arg)*(UINT16 *)(* p_argv); |
| 115 | break; |
| 116 | |
| 117 | case FFI_TYPE_SINT32: |
| 118 | *(ffi_sarg *) argp = (ffi_sarg)*(SINT32 *)(* p_argv); |
| 119 | break; |
| 120 | |
| 121 | case FFI_TYPE_UINT32: |
| 122 | *(ffi_arg *) argp = (ffi_arg)*(UINT32 *)(* p_argv); |
| 123 | break; |
| 124 | |
| 125 | case FFI_TYPE_STRUCT: |
| 126 | *(ffi_arg *) argp = *(ffi_arg *)(* p_argv); |
| 127 | break; |
| 128 | |
| 129 | default: |
| 130 | FFI_ASSERT(0); |
| 131 | } |
| 132 | } |
| 133 | else |
| 134 | { |
| 135 | memcpy(argp, *p_argv, z); |
| 136 | } |
| 137 | p_argv++; |
| 138 | #ifdef X86_WIN64 |
| 139 | argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1); |
| 140 | #else |
| 141 | argp += z; |
| 142 | #endif |
| 143 | } |
| 144 | |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | /* Perform machine dependent cif processing */ |
| 149 | ffi_status ffi_prep_cif_machdep(ffi_cif *cif) |
| 150 | { |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 151 | unsigned int i; |
| 152 | ffi_type **ptr; |
| 153 | |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 154 | /* Set the return type flag */ |
| 155 | switch (cif->rtype->type) |
| 156 | { |
| 157 | case FFI_TYPE_VOID: |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 158 | #if defined(X86) || defined (X86_WIN32) || defined(X86_FREEBSD) || defined(X86_DARWIN) || defined(X86_WIN64) |
| 159 | case FFI_TYPE_UINT8: |
| 160 | case FFI_TYPE_UINT16: |
| 161 | case FFI_TYPE_SINT8: |
| 162 | case FFI_TYPE_SINT16: |
| 163 | #endif |
| 164 | #ifdef X86_WIN64 |
| 165 | case FFI_TYPE_UINT32: |
| 166 | case FFI_TYPE_SINT32: |
| 167 | #endif |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 168 | case FFI_TYPE_SINT64: |
| 169 | case FFI_TYPE_FLOAT: |
| 170 | case FFI_TYPE_DOUBLE: |
| 171 | #ifndef X86_WIN64 |
| 172 | #if FFI_TYPE_DOUBLE != FFI_TYPE_LONGDOUBLE |
| 173 | case FFI_TYPE_LONGDOUBLE: |
| 174 | #endif |
| 175 | #endif |
| 176 | cif->flags = (unsigned) cif->rtype->type; |
| 177 | break; |
| 178 | |
| 179 | case FFI_TYPE_UINT64: |
| 180 | #ifdef X86_WIN64 |
| 181 | case FFI_TYPE_POINTER: |
| 182 | #endif |
| 183 | cif->flags = FFI_TYPE_SINT64; |
| 184 | break; |
| 185 | |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 186 | case FFI_TYPE_STRUCT: |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 187 | #ifndef X86 |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 188 | if (cif->rtype->size == 1) |
| 189 | { |
| 190 | cif->flags = FFI_TYPE_SMALL_STRUCT_1B; /* same as char size */ |
| 191 | } |
| 192 | else if (cif->rtype->size == 2) |
| 193 | { |
| 194 | cif->flags = FFI_TYPE_SMALL_STRUCT_2B; /* same as short size */ |
| 195 | } |
| 196 | else if (cif->rtype->size == 4) |
| 197 | { |
| 198 | #ifdef X86_WIN64 |
| 199 | cif->flags = FFI_TYPE_SMALL_STRUCT_4B; |
| 200 | #else |
| 201 | cif->flags = FFI_TYPE_INT; /* same as int type */ |
| 202 | #endif |
| 203 | } |
| 204 | else if (cif->rtype->size == 8) |
| 205 | { |
| 206 | cif->flags = FFI_TYPE_SINT64; /* same as int64 type */ |
| 207 | } |
| 208 | else |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 209 | #endif |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 210 | { |
| 211 | cif->flags = FFI_TYPE_STRUCT; |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 212 | // allocate space for return value pointer |
| 213 | cif->bytes += ALIGN(sizeof(void*), FFI_SIZEOF_ARG); |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 214 | } |
| 215 | break; |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 216 | |
| 217 | default: |
| 218 | #ifdef X86_WIN64 |
| 219 | cif->flags = FFI_TYPE_SINT64; |
| 220 | break; |
| 221 | case FFI_TYPE_INT: |
| 222 | cif->flags = FFI_TYPE_SINT32; |
| 223 | #else |
| 224 | cif->flags = FFI_TYPE_INT; |
| 225 | #endif |
| 226 | break; |
| 227 | } |
| 228 | |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 229 | for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++) |
| 230 | { |
| 231 | if (((*ptr)->alignment - 1) & cif->bytes) |
| 232 | cif->bytes = ALIGN(cif->bytes, (*ptr)->alignment); |
| 233 | cif->bytes += ALIGN((*ptr)->size, FFI_SIZEOF_ARG); |
| 234 | } |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 235 | |
| 236 | #ifdef X86_WIN64 |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 237 | // ensure space for storing four registers |
| 238 | cif->bytes += 4 * sizeof(ffi_arg); |
| 239 | #endif |
| 240 | |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 241 | #ifdef X86_DARWIN |
| 242 | cif->bytes = (cif->bytes + 15) & ~0xF; |
| 243 | #endif |
| 244 | |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 245 | return FFI_OK; |
| 246 | } |
| 247 | |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 248 | #ifdef X86_WIN64 |
| 249 | extern int |
| 250 | ffi_call_win64(void (*)(char *, extended_cif *), extended_cif *, |
| 251 | unsigned, unsigned, unsigned *, void (*fn)(void)); |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 252 | #elif defined(X86_WIN32) |
| 253 | extern void |
| 254 | ffi_call_win32(void (*)(char *, extended_cif *), extended_cif *, |
| 255 | unsigned, unsigned, unsigned *, void (*fn)(void)); |
| 256 | #else |
| 257 | extern void ffi_call_SYSV(void (*)(char *, extended_cif *), extended_cif *, |
| 258 | unsigned, unsigned, unsigned *, void (*fn)(void)); |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 259 | #endif |
| 260 | |
| 261 | void ffi_call(ffi_cif *cif, void (*fn)(void), void *rvalue, void **avalue) |
| 262 | { |
| 263 | extended_cif ecif; |
| 264 | |
| 265 | ecif.cif = cif; |
| 266 | ecif.avalue = avalue; |
| 267 | |
| 268 | /* If the return value is a struct and we don't have a return */ |
| 269 | /* value address then we need to make one */ |
| 270 | |
| 271 | #ifdef X86_WIN64 |
| 272 | if (rvalue == NULL |
| 273 | && cif->flags == FFI_TYPE_STRUCT |
| 274 | && cif->rtype->size != 1 && cif->rtype->size != 2 |
| 275 | && cif->rtype->size != 4 && cif->rtype->size != 8) |
| 276 | { |
| 277 | ecif.rvalue = alloca((cif->rtype->size + 0xF) & ~0xF); |
| 278 | } |
| 279 | #else |
| 280 | if (rvalue == NULL |
| 281 | && cif->flags == FFI_TYPE_STRUCT) |
| 282 | { |
| 283 | ecif.rvalue = alloca(cif->rtype->size); |
| 284 | } |
| 285 | #endif |
| 286 | else |
| 287 | ecif.rvalue = rvalue; |
| 288 | |
| 289 | |
| 290 | switch (cif->abi) |
| 291 | { |
| 292 | #ifdef X86_WIN64 |
| 293 | case FFI_WIN64: |
| 294 | { |
| 295 | // Make copies of all struct arguments |
| 296 | // NOTE: not sure if responsibility should be here or in caller |
| 297 | unsigned int i; |
| 298 | for (i=0; i < cif->nargs;i++) { |
| 299 | size_t size = cif->arg_types[i]->size; |
| 300 | if ((cif->arg_types[i]->type == FFI_TYPE_STRUCT |
| 301 | && (size != 1 && size != 2 && size != 4 && size != 8)) |
| 302 | #if FFI_TYPE_LONGDOUBLE != FFI_TYPE_DOUBLE |
| 303 | || cif->arg_types[i]->type == FFI_TYPE_LONGDOUBLE |
| 304 | #endif |
| 305 | ) |
| 306 | { |
| 307 | void *local = alloca(size); |
| 308 | memcpy(local, avalue[i], size); |
| 309 | avalue[i] = local; |
| 310 | } |
| 311 | } |
| 312 | ffi_call_win64(ffi_prep_args, &ecif, cif->bytes, |
| 313 | cif->flags, ecif.rvalue, fn); |
| 314 | } |
| 315 | break; |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 316 | #elif defined(X86_WIN32) |
| 317 | case FFI_SYSV: |
| 318 | case FFI_STDCALL: |
| 319 | ffi_call_win32(ffi_prep_args, &ecif, cif->bytes, cif->flags, |
| 320 | ecif.rvalue, fn); |
| 321 | break; |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 322 | #else |
| 323 | case FFI_SYSV: |
| 324 | ffi_call_SYSV(ffi_prep_args, &ecif, cif->bytes, cif->flags, ecif.rvalue, |
| 325 | fn); |
| 326 | break; |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 327 | #endif |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 328 | default: |
| 329 | FFI_ASSERT(0); |
| 330 | break; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | |
| 335 | /** private members **/ |
| 336 | |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 337 | /* The following __attribute__((regparm(1))) decorations will have no effect |
| 338 | on MSVC - standard cdecl convention applies. */ |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 339 | static void ffi_prep_incoming_args_SYSV (char *stack, void **ret, |
| 340 | void** args, ffi_cif* cif); |
| 341 | void FFI_HIDDEN ffi_closure_SYSV (ffi_closure *) |
| 342 | __attribute__ ((regparm(1))); |
| 343 | unsigned int FFI_HIDDEN ffi_closure_SYSV_inner (ffi_closure *, void **, void *) |
| 344 | __attribute__ ((regparm(1))); |
| 345 | void FFI_HIDDEN ffi_closure_raw_SYSV (ffi_raw_closure *) |
| 346 | __attribute__ ((regparm(1))); |
| 347 | #ifdef X86_WIN32 |
| 348 | void FFI_HIDDEN ffi_closure_STDCALL (ffi_closure *) |
| 349 | __attribute__ ((regparm(1))); |
| 350 | #endif |
| 351 | #ifdef X86_WIN64 |
| 352 | void FFI_HIDDEN ffi_closure_win64 (ffi_closure *); |
| 353 | #endif |
| 354 | |
| 355 | /* This function is jumped to by the trampoline */ |
| 356 | |
| 357 | #ifdef X86_WIN64 |
| 358 | void * FFI_HIDDEN |
| 359 | ffi_closure_win64_inner (ffi_closure *closure, void *args) { |
| 360 | ffi_cif *cif; |
| 361 | void **arg_area; |
| 362 | void *result; |
| 363 | void *resp = &result; |
| 364 | |
| 365 | cif = closure->cif; |
| 366 | arg_area = (void**) alloca (cif->nargs * sizeof (void*)); |
| 367 | |
| 368 | /* this call will initialize ARG_AREA, such that each |
| 369 | * element in that array points to the corresponding |
| 370 | * value on the stack; and if the function returns |
| 371 | * a structure, it will change RESP to point to the |
| 372 | * structure return address. */ |
| 373 | |
| 374 | ffi_prep_incoming_args_SYSV(args, &resp, arg_area, cif); |
| 375 | |
| 376 | (closure->fun) (cif, resp, arg_area, closure->user_data); |
| 377 | |
| 378 | /* The result is returned in rax. This does the right thing for |
| 379 | result types except for floats; we have to 'mov xmm0, rax' in the |
| 380 | caller to correct this. |
| 381 | TODO: structure sizes of 3 5 6 7 are returned by reference, too!!! |
| 382 | */ |
| 383 | return cif->rtype->size > sizeof(void *) ? resp : *(void **)resp; |
| 384 | } |
| 385 | |
| 386 | #else |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 387 | unsigned int FFI_HIDDEN __attribute__ ((regparm(1))) |
| 388 | ffi_closure_SYSV_inner (ffi_closure *closure, void **respp, void *args) |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 389 | { |
| 390 | /* our various things... */ |
| 391 | ffi_cif *cif; |
| 392 | void **arg_area; |
| 393 | |
| 394 | cif = closure->cif; |
| 395 | arg_area = (void**) alloca (cif->nargs * sizeof (void*)); |
| 396 | |
| 397 | /* this call will initialize ARG_AREA, such that each |
| 398 | * element in that array points to the corresponding |
| 399 | * value on the stack; and if the function returns |
| 400 | * a structure, it will change RESP to point to the |
| 401 | * structure return address. */ |
| 402 | |
| 403 | ffi_prep_incoming_args_SYSV(args, respp, arg_area, cif); |
| 404 | |
| 405 | (closure->fun) (cif, *respp, arg_area, closure->user_data); |
| 406 | |
| 407 | return cif->flags; |
| 408 | } |
| 409 | #endif /* !X86_WIN64 */ |
| 410 | |
| 411 | static void |
| 412 | ffi_prep_incoming_args_SYSV(char *stack, void **rvalue, void **avalue, |
| 413 | ffi_cif *cif) |
| 414 | { |
| 415 | register unsigned int i; |
| 416 | register void **p_argv; |
| 417 | register char *argp; |
| 418 | register ffi_type **p_arg; |
| 419 | |
| 420 | argp = stack; |
| 421 | |
| 422 | #ifdef X86_WIN64 |
| 423 | if (cif->rtype->size > sizeof(ffi_arg) |
| 424 | || (cif->flags == FFI_TYPE_STRUCT |
| 425 | && (cif->rtype->size != 1 && cif->rtype->size != 2 |
| 426 | && cif->rtype->size != 4 && cif->rtype->size != 8))) { |
| 427 | *rvalue = *(void **) argp; |
| 428 | argp += sizeof(void *); |
| 429 | } |
| 430 | #else |
| 431 | if ( cif->flags == FFI_TYPE_STRUCT ) { |
| 432 | *rvalue = *(void **) argp; |
| 433 | argp += sizeof(void *); |
| 434 | } |
| 435 | #endif |
| 436 | |
| 437 | p_argv = avalue; |
| 438 | |
| 439 | for (i = cif->nargs, p_arg = cif->arg_types; (i != 0); i--, p_arg++) |
| 440 | { |
| 441 | size_t z; |
| 442 | |
| 443 | /* Align if necessary */ |
| 444 | if ((sizeof(void*) - 1) & (size_t) argp) { |
| 445 | argp = (char *) ALIGN(argp, sizeof(void*)); |
| 446 | } |
| 447 | |
| 448 | #ifdef X86_WIN64 |
| 449 | if ((*p_arg)->size > sizeof(ffi_arg) |
| 450 | || ((*p_arg)->type == FFI_TYPE_STRUCT |
| 451 | && ((*p_arg)->size != 1 && (*p_arg)->size != 2 |
| 452 | && (*p_arg)->size != 4 && (*p_arg)->size != 8))) |
| 453 | { |
| 454 | z = sizeof(void *); |
| 455 | *p_argv = *(void **)argp; |
| 456 | } |
| 457 | else |
| 458 | #endif |
| 459 | { |
| 460 | z = (*p_arg)->size; |
| 461 | |
| 462 | /* because we're little endian, this is what it turns into. */ |
| 463 | |
| 464 | *p_argv = (void*) argp; |
| 465 | } |
| 466 | |
| 467 | p_argv++; |
| 468 | #ifdef X86_WIN64 |
| 469 | argp += (z + sizeof(void*) - 1) & ~(sizeof(void*) - 1); |
| 470 | #else |
| 471 | argp += z; |
| 472 | #endif |
| 473 | } |
| 474 | |
| 475 | return; |
| 476 | } |
| 477 | |
| 478 | #define FFI_INIT_TRAMPOLINE_WIN64(TRAMP,FUN,CTX,MASK) \ |
| 479 | { unsigned char *__tramp = (unsigned char*)(TRAMP); \ |
| 480 | void* __fun = (void*)(FUN); \ |
| 481 | void* __ctx = (void*)(CTX); \ |
| 482 | *(unsigned char*) &__tramp[0] = 0x41; \ |
| 483 | *(unsigned char*) &__tramp[1] = 0xbb; \ |
| 484 | *(unsigned int*) &__tramp[2] = MASK; /* mov $mask, %r11 */ \ |
| 485 | *(unsigned char*) &__tramp[6] = 0x48; \ |
| 486 | *(unsigned char*) &__tramp[7] = 0xb8; \ |
| 487 | *(void**) &__tramp[8] = __ctx; /* mov __ctx, %rax */ \ |
| 488 | *(unsigned char *) &__tramp[16] = 0x49; \ |
| 489 | *(unsigned char *) &__tramp[17] = 0xba; \ |
| 490 | *(void**) &__tramp[18] = __fun; /* mov __fun, %r10 */ \ |
| 491 | *(unsigned char *) &__tramp[26] = 0x41; \ |
| 492 | *(unsigned char *) &__tramp[27] = 0xff; \ |
| 493 | *(unsigned char *) &__tramp[28] = 0xe2; /* jmp %r10 */ \ |
| 494 | } |
| 495 | |
| 496 | /* How to make a trampoline. Derived from gcc/config/i386/i386.c. */ |
| 497 | |
| 498 | #define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX) \ |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 499 | { unsigned char *__tramp = (unsigned char*)(TRAMP); \ |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 500 | unsigned int __fun = (unsigned int)(FUN); \ |
| 501 | unsigned int __ctx = (unsigned int)(CTX); \ |
| 502 | unsigned int __dis = __fun - (__ctx + 10); \ |
| 503 | *(unsigned char*) &__tramp[0] = 0xb8; \ |
| 504 | *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \ |
| 505 | *(unsigned char *) &__tramp[5] = 0xe9; \ |
| 506 | *(unsigned int*) &__tramp[6] = __dis; /* jmp __fun */ \ |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 507 | } |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 508 | |
| 509 | #define FFI_INIT_TRAMPOLINE_STDCALL(TRAMP,FUN,CTX,SIZE) \ |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 510 | { unsigned char *__tramp = (unsigned char*)(TRAMP); \ |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 511 | unsigned int __fun = (unsigned int)(FUN); \ |
| 512 | unsigned int __ctx = (unsigned int)(CTX); \ |
| 513 | unsigned int __dis = __fun - (__ctx + 10); \ |
| 514 | unsigned short __size = (unsigned short)(SIZE); \ |
| 515 | *(unsigned char*) &__tramp[0] = 0xb8; \ |
| 516 | *(unsigned int*) &__tramp[1] = __ctx; /* movl __ctx, %eax */ \ |
| 517 | *(unsigned char *) &__tramp[5] = 0xe8; \ |
| 518 | *(unsigned int*) &__tramp[6] = __dis; /* call __fun */ \ |
| 519 | *(unsigned char *) &__tramp[10] = 0xc2; \ |
| 520 | *(unsigned short*) &__tramp[11] = __size; /* ret __size */ \ |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 521 | } |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 522 | |
| 523 | /* the cif must already be prep'ed */ |
| 524 | |
| 525 | ffi_status |
| 526 | ffi_prep_closure_loc (ffi_closure* closure, |
| 527 | ffi_cif* cif, |
| 528 | void (*fun)(ffi_cif*,void*,void**,void*), |
| 529 | void *user_data, |
| 530 | void *codeloc) |
| 531 | { |
| 532 | #ifdef X86_WIN64 |
| 533 | #define ISFLOAT(IDX) (cif->arg_types[IDX]->type == FFI_TYPE_FLOAT || cif->arg_types[IDX]->type == FFI_TYPE_DOUBLE) |
| 534 | #define FLAG(IDX) (cif->nargs>(IDX)&&ISFLOAT(IDX)?(1<<(IDX)):0) |
| 535 | if (cif->abi == FFI_WIN64) |
| 536 | { |
| 537 | int mask = FLAG(0)|FLAG(1)|FLAG(2)|FLAG(3); |
| 538 | FFI_INIT_TRAMPOLINE_WIN64 (&closure->tramp[0], |
| 539 | &ffi_closure_win64, |
| 540 | codeloc, mask); |
| 541 | /* make sure we can execute here */ |
| 542 | } |
| 543 | #else |
| 544 | if (cif->abi == FFI_SYSV) |
| 545 | { |
| 546 | FFI_INIT_TRAMPOLINE (&closure->tramp[0], |
| 547 | &ffi_closure_SYSV, |
| 548 | (void*)codeloc); |
| 549 | } |
| 550 | #ifdef X86_WIN32 |
| 551 | else if (cif->abi == FFI_STDCALL) |
| 552 | { |
| 553 | FFI_INIT_TRAMPOLINE_STDCALL (&closure->tramp[0], |
| 554 | &ffi_closure_STDCALL, |
| 555 | (void*)codeloc, cif->bytes); |
| 556 | } |
| 557 | #endif /* X86_WIN32 */ |
| 558 | #endif /* !X86_WIN64 */ |
| 559 | else |
| 560 | { |
| 561 | return FFI_BAD_ABI; |
| 562 | } |
| 563 | |
| 564 | closure->cif = cif; |
| 565 | closure->user_data = user_data; |
| 566 | closure->fun = fun; |
| 567 | |
| 568 | return FFI_OK; |
| 569 | } |
| 570 | |
| 571 | /* ------- Native raw API support -------------------------------- */ |
| 572 | |
| 573 | #if !FFI_NO_RAW_API |
| 574 | |
| 575 | ffi_status |
| 576 | ffi_prep_raw_closure_loc (ffi_raw_closure* closure, |
| 577 | ffi_cif* cif, |
| 578 | void (*fun)(ffi_cif*,void*,ffi_raw*,void*), |
| 579 | void *user_data, |
| 580 | void *codeloc) |
| 581 | { |
| 582 | int i; |
| 583 | |
| 584 | if (cif->abi != FFI_SYSV) { |
| 585 | return FFI_BAD_ABI; |
| 586 | } |
| 587 | |
| 588 | // we currently don't support certain kinds of arguments for raw |
| 589 | // closures. This should be implemented by a separate assembly language |
| 590 | // routine, since it would require argument processing, something we |
| 591 | // don't do now for performance. |
| 592 | |
| 593 | for (i = cif->nargs-1; i >= 0; i--) |
| 594 | { |
| 595 | FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_STRUCT); |
| 596 | FFI_ASSERT (cif->arg_types[i]->type != FFI_TYPE_LONGDOUBLE); |
| 597 | } |
| 598 | |
| 599 | |
| 600 | FFI_INIT_TRAMPOLINE (&closure->tramp[0], &ffi_closure_raw_SYSV, |
| 601 | codeloc); |
| 602 | |
| 603 | closure->cif = cif; |
| 604 | closure->user_data = user_data; |
| 605 | closure->fun = fun; |
| 606 | |
| 607 | return FFI_OK; |
| 608 | } |
| 609 | |
| 610 | static void |
| 611 | ffi_prep_args_raw(char *stack, extended_cif *ecif) |
| 612 | { |
| 613 | memcpy (stack, ecif->avalue, ecif->cif->bytes); |
| 614 | } |
| 615 | |
| 616 | /* we borrow this routine from libffi (it must be changed, though, to |
| 617 | * actually call the function passed in the first argument. as of |
| 618 | * libffi-1.20, this is not the case.) |
| 619 | */ |
| 620 | |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 621 | void |
| 622 | ffi_raw_call(ffi_cif *cif, void (*fn)(void), void *rvalue, ffi_raw *fake_avalue) |
| 623 | { |
| 624 | extended_cif ecif; |
| 625 | void **avalue = (void **)fake_avalue; |
| 626 | |
| 627 | ecif.cif = cif; |
| 628 | ecif.avalue = avalue; |
| 629 | |
| 630 | /* If the return value is a struct and we don't have a return */ |
| 631 | /* value address then we need to make one */ |
| 632 | |
| 633 | if ((rvalue == NULL) && |
| 634 | (cif->rtype->type == FFI_TYPE_STRUCT)) |
| 635 | { |
| 636 | ecif.rvalue = alloca(cif->rtype->size); |
| 637 | } |
| 638 | else |
| 639 | ecif.rvalue = rvalue; |
| 640 | |
| 641 | |
| 642 | switch (cif->abi) |
| 643 | { |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 644 | #ifdef X86_WIN32 |
| 645 | case FFI_SYSV: |
| 646 | case FFI_STDCALL: |
| 647 | ffi_call_win32(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags, |
| 648 | ecif.rvalue, fn); |
| 649 | break; |
| 650 | #else |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 651 | case FFI_SYSV: |
| 652 | ffi_call_SYSV(ffi_prep_args_raw, &ecif, cif->bytes, cif->flags, |
| 653 | ecif.rvalue, fn); |
| 654 | break; |
Anthony Green | cadeba6 | 2010-01-15 10:46:51 -0500 | [diff] [blame^] | 655 | #endif |
Anthony Green | c6dddbd | 2009-10-04 08:11:33 -0400 | [diff] [blame] | 656 | default: |
| 657 | FFI_ASSERT(0); |
| 658 | break; |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | #endif |
| 663 | |
| 664 | #endif /* !__x86_64__ || X86_WIN64 */ |
| 665 | |