Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/bsd/dev/i386/systemcalls.c
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1 /* 2 * Copyright (c) 2000-2008 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 #include <kern/task.h> 29 #include <kern/thread.h> 30 #include <kern/assert.h> 31 #include <kern/clock.h> 32 #include <kern/locks.h> 33 #include <kern/sched_prim.h> 34 #include <kern/debug.h> 35 #include <mach/machine/thread_status.h> 36 #include <mach/thread_act.h> 37 #include <mach/branch_predicates.h> 38 39 #include <sys/kernel.h> 40 #include <sys/vm.h> 41 #include <sys/proc_internal.h> 42 #include <sys/syscall.h> 43 #include <sys/systm.h> 44 #include <sys/user.h> 45 #include <sys/errno.h> 46 #include <sys/kdebug.h> 47 #include <sys/sysent.h> 48 #include <sys/sysproto.h> 49 #include <sys/kauth.h> 50 #include <sys/systm.h> 51 52 #include <security/audit/audit.h> 53 54 #include <i386/seg.h> 55 #include <i386/machine_routines.h> 56 #include <mach/i386/syscall_sw.h> 57 58 #include <machine/pal_routines.h> 59 60 #if CONFIG_DTRACE 61 extern int32_t dtrace_systrace_syscall(struct proc *, void *, int *); 62 extern void dtrace_systrace_syscall_return(unsigned short, int, int *); 63 #endif 64 65 extern void unix_syscall(x86_saved_state_t *); 66 extern void unix_syscall64(x86_saved_state_t *); 67 extern void *find_user_regs(thread_t); 68 69 extern void x86_toggle_sysenter_arg_store(thread_t thread, boolean_t valid); 70 extern boolean_t x86_sysenter_arg_store_isvalid(thread_t thread); 71 72 /* dynamically generated at build time based on syscalls.master */ 73 extern const char *syscallnames[]; 74 75 /* 76 * This needs to be a single switch so that it's "all on" or "all off", 77 * rather than being turned on for some code paths and not others, as this 78 * has a tendency to introduce "blame the next guy" bugs. 79 */ 80 #if DEBUG 81 #define FUNNEL_DEBUG 1 /* Check for funnel held on exit */ 82 #endif 83 84 /* 85 * Function: unix_syscall 86 * 87 * Inputs: regs - pointer to i386 save area 88 * 89 * Outputs: none 90 */ 91 void 92 unix_syscall(x86_saved_state_t *state) 93 { 94 thread_t thread; 95 void *vt; 96 unsigned int code; 97 struct sysent *callp; 98 99 int error; 100 vm_offset_t params; 101 struct proc *p; 102 struct uthread *uthread; 103 x86_saved_state32_t *regs; 104 boolean_t args_in_uthread; 105 boolean_t is_vfork; 106 107 assert(is_saved_state32(state)); 108 regs = saved_state32(state); 109 #if DEBUG 110 if (regs->eax == 0x800) 111 thread_exception_return(); 112 #endif 113 thread = current_thread(); 114 uthread = get_bsdthread_info(thread); 115 116 /* Get the approriate proc; may be different from task's for vfork() */ 117 is_vfork = uthread->uu_flag & UT_VFORK; 118 if (__improbable(is_vfork != 0)) 119 p = current_proc(); 120 else 121 p = (struct proc *)get_bsdtask_info(current_task()); 122 123 /* Verify that we are not being called from a task without a proc */ 124 if (__improbable(p == NULL)) { 125 regs->eax = EPERM; 126 regs->efl |= EFL_CF; 127 task_terminate_internal(current_task()); 128 thread_exception_return(); 129 /* NOTREACHED */ 130 } 131 132 code = regs->eax & I386_SYSCALL_NUMBER_MASK; 133 DEBUG_KPRINT_SYSCALL_UNIX("unix_syscall: code=%d(%s) eip=%u\n", 134 code, syscallnames[code >= NUM_SYSENT ? 63 : code], (uint32_t)regs->eip); 135 args_in_uthread = ((regs->eax & I386_SYSCALL_ARG_BYTES_MASK) != 0) && x86_sysenter_arg_store_isvalid(thread); 136 params = (vm_offset_t) (regs->uesp + sizeof (int)); 137 138 regs->efl &= ~(EFL_CF); 139 140 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 141 142 if (__improbable(callp == sysent)) { 143 code = fuword(params); 144 params += sizeof(int); 145 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 146 } 147 148 vt = (void *)uthread->uu_arg; 149 150 if (callp->sy_arg_bytes != 0) { 151 sy_munge_t *mungerp; 152 153 assert((unsigned) callp->sy_arg_bytes <= sizeof (uthread->uu_arg)); 154 if (!args_in_uthread) 155 { 156 uint32_t nargs; 157 nargs = callp->sy_arg_bytes; 158 error = copyin((user_addr_t) params, (char *) vt, nargs); 159 if (error) { 160 regs->eax = error; 161 regs->efl |= EFL_CF; 162 thread_exception_return(); 163 /* NOTREACHED */ 164 } 165 } 166 167 if (__probable(code != 180)) { 168 int *ip = (int *)vt; 169 170 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, 171 *ip, *(ip+1), *(ip+2), *(ip+3), 0); 172 } 173 mungerp = callp->sy_arg_munge32; 174 175 /* 176 * If non-NULL, then call the syscall argument munger to 177 * copy in arguments (see xnu/bsd/dev/{i386|x86_64}/munge.s); the 178 * first argument is NULL because we are munging in place 179 * after a copyin because the ABI currently doesn't use 180 * registers to pass system call arguments. 181 */ 182 if (mungerp != NULL) 183 (*mungerp)(NULL, vt); 184 } else 185 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, 186 0, 0, 0, 0, 0); 187 188 /* 189 * Delayed binding of thread credential to process credential, if we 190 * are not running with an explicitly set thread credential. 191 */ 192 kauth_cred_uthread_update(uthread, p); 193 194 uthread->uu_rval[0] = 0; 195 uthread->uu_rval[1] = regs->edx; 196 uthread->uu_flag |= UT_NOTCANCELPT; 197 198 199 #ifdef JOE_DEBUG 200 uthread->uu_iocount = 0; 201 uthread->uu_vpindex = 0; 202 #endif 203 204 AUDIT_SYSCALL_ENTER(code, p, uthread); 205 error = (*(callp->sy_call))((void *) p, (void *) vt, &(uthread->uu_rval[0])); 206 AUDIT_SYSCALL_EXIT(code, p, uthread, error); 207 208 #ifdef JOE_DEBUG 209 if (uthread->uu_iocount) 210 printf("system call returned with uu_iocount != 0\n"); 211 #endif 212 #if CONFIG_DTRACE 213 uthread->t_dtrace_errno = error; 214 #endif /* CONFIG_DTRACE */ 215 216 if (__improbable(error == ERESTART)) { 217 /* 218 * Move the user's pc back to repeat the syscall: 219 * 5 bytes for a sysenter, or 2 for an int 8x. 220 * The SYSENTER_TF_CS covers single-stepping over a sysenter 221 * - see debug trap handler in idt.s/idt64.s 222 */ 223 224 pal_syscall_restart(thread, state); 225 } 226 else if (error != EJUSTRETURN) { 227 if (__improbable(error)) { 228 regs->eax = error; 229 regs->efl |= EFL_CF; /* carry bit */ 230 } else { /* (not error) */ 231 regs->eax = uthread->uu_rval[0]; 232 regs->edx = uthread->uu_rval[1]; 233 } 234 } 235 236 DEBUG_KPRINT_SYSCALL_UNIX( 237 "unix_syscall: error=%d retval=(%u,%u)\n", 238 error, regs->eax, regs->edx); 239 240 uthread->uu_flag &= ~UT_NOTCANCELPT; 241 #if FUNNEL_DEBUG 242 /* 243 * if we're holding the funnel panic 244 */ 245 syscall_exit_funnelcheck(); 246 #endif /* FUNNEL_DEBUG */ 247 248 if (__improbable(uthread->uu_lowpri_window)) { 249 /* 250 * task is marked as a low priority I/O type 251 * and the I/O we issued while in this system call 252 * collided with normal I/O operations... we'll 253 * delay in order to mitigate the impact of this 254 * task on the normal operation of the system 255 */ 256 throttle_lowpri_io(TRUE); 257 } 258 if (__probable(code != 180)) 259 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END, 260 error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0); 261 262 if (__improbable(!is_vfork && callp->sy_call == (sy_call_t *)execve && !error)) { 263 pal_execve_return(thread); 264 } 265 266 thread_exception_return(); 267 /* NOTREACHED */ 268 } 269 270 271 void 272 unix_syscall64(x86_saved_state_t *state) 273 { 274 thread_t thread; 275 unsigned int code; 276 struct sysent *callp; 277 void *uargp; 278 int args_in_regs; 279 int error; 280 struct proc *p; 281 struct uthread *uthread; 282 x86_saved_state64_t *regs; 283 284 assert(is_saved_state64(state)); 285 regs = saved_state64(state); 286 #if DEBUG 287 if (regs->rax == 0x2000800) 288 thread_exception_return(); 289 #endif 290 thread = current_thread(); 291 uthread = get_bsdthread_info(thread); 292 293 /* Get the approriate proc; may be different from task's for vfork() */ 294 if (__probable(!(uthread->uu_flag & UT_VFORK))) 295 p = (struct proc *)get_bsdtask_info(current_task()); 296 else 297 p = current_proc(); 298 299 /* Verify that we are not being called from a task without a proc */ 300 if (__improbable(p == NULL)) { 301 regs->rax = EPERM; 302 regs->isf.rflags |= EFL_CF; 303 task_terminate_internal(current_task()); 304 thread_exception_return(); 305 /* NOTREACHED */ 306 } 307 args_in_regs = 6; 308 309 code = regs->rax & SYSCALL_NUMBER_MASK; 310 DEBUG_KPRINT_SYSCALL_UNIX( 311 "unix_syscall64: code=%d(%s) rip=%llx\n", 312 code, syscallnames[code >= NUM_SYSENT ? 63 : code], regs->isf.rip); 313 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 314 uargp = (void *)(®s->rdi); 315 316 if (__improbable(callp == sysent)) { 317 /* 318 * indirect system call... system call number 319 * passed as 'arg0' 320 */ 321 code = regs->rdi; 322 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 323 uargp = (void *)(®s->rsi); 324 args_in_regs = 5; 325 } 326 327 if (callp->sy_narg != 0) { 328 if (code != 180) { 329 uint64_t *ip = (uint64_t *)uargp; 330 331 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, 332 (int)(*ip), (int)(*(ip+1)), (int)(*(ip+2)), (int)(*(ip+3)), 0); 333 } 334 assert(callp->sy_narg <= 8); 335 336 if (__improbable(callp->sy_narg > args_in_regs)) { 337 int copyin_count; 338 339 copyin_count = (callp->sy_narg - args_in_regs) * sizeof(uint64_t); 340 341 error = copyin((user_addr_t)(regs->isf.rsp + sizeof(user_addr_t)), (char *)®s->v_arg6, copyin_count); 342 if (error) { 343 regs->rax = error; 344 regs->isf.rflags |= EFL_CF; 345 thread_exception_return(); 346 /* NOTREACHED */ 347 } 348 } 349 /* 350 * XXX Turn 64 bit unsafe calls into nosys() 351 */ 352 if (__improbable(callp->sy_flags & UNSAFE_64BIT)) { 353 callp = &sysent[63]; 354 goto unsafe; 355 } 356 } else 357 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START, 358 0, 0, 0, 0, 0); 359 unsafe: 360 361 /* 362 * Delayed binding of thread credential to process credential, if we 363 * are not running with an explicitly set thread credential. 364 */ 365 kauth_cred_uthread_update(uthread, p); 366 367 uthread->uu_rval[0] = 0; 368 uthread->uu_rval[1] = 0; 369 370 371 uthread->uu_flag |= UT_NOTCANCELPT; 372 373 #ifdef JOE_DEBUG 374 uthread->uu_iocount = 0; 375 uthread->uu_vpindex = 0; 376 #endif 377 378 AUDIT_SYSCALL_ENTER(code, p, uthread); 379 error = (*(callp->sy_call))((void *) p, uargp, &(uthread->uu_rval[0])); 380 AUDIT_SYSCALL_EXIT(code, p, uthread, error); 381 382 #ifdef JOE_DEBUG 383 if (uthread->uu_iocount) 384 printf("system call returned with uu_iocount != 0\n"); 385 #endif 386 387 #if CONFIG_DTRACE 388 uthread->t_dtrace_errno = error; 389 #endif /* CONFIG_DTRACE */ 390 391 if (__improbable(error == ERESTART)) { 392 /* 393 * all system calls come through via the syscall instruction 394 * in 64 bit mode... its 2 bytes in length 395 * move the user's pc back to repeat the syscall: 396 */ 397 pal_syscall_restart( thread, state ); 398 } 399 else if (error != EJUSTRETURN) { 400 if (__improbable(error)) { 401 regs->rax = error; 402 regs->isf.rflags |= EFL_CF; /* carry bit */ 403 } else { /* (not error) */ 404 405 switch (callp->sy_return_type) { 406 case _SYSCALL_RET_INT_T: 407 regs->rax = uthread->uu_rval[0]; 408 regs->rdx = uthread->uu_rval[1]; 409 break; 410 case _SYSCALL_RET_UINT_T: 411 regs->rax = ((u_int)uthread->uu_rval[0]); 412 regs->rdx = ((u_int)uthread->uu_rval[1]); 413 break; 414 case _SYSCALL_RET_OFF_T: 415 case _SYSCALL_RET_ADDR_T: 416 case _SYSCALL_RET_SIZE_T: 417 case _SYSCALL_RET_SSIZE_T: 418 case _SYSCALL_RET_UINT64_T: 419 regs->rax = *((uint64_t *)(&uthread->uu_rval[0])); 420 regs->rdx = 0; 421 break; 422 case _SYSCALL_RET_NONE: 423 break; 424 default: 425 panic("unix_syscall: unknown return type"); 426 break; 427 } 428 regs->isf.rflags &= ~EFL_CF; 429 } 430 } 431 432 DEBUG_KPRINT_SYSCALL_UNIX( 433 "unix_syscall64: error=%d retval=(%llu,%llu)\n", 434 error, regs->rax, regs->rdx); 435 436 uthread->uu_flag &= ~UT_NOTCANCELPT; 437 438 #if FUNNEL_DEBUG 439 /* 440 * if we're holding the funnel panic 441 */ 442 syscall_exit_funnelcheck(); 443 #endif /* FUNNEL_DEBUG */ 444 445 if (__improbable(uthread->uu_lowpri_window)) { 446 /* 447 * task is marked as a low priority I/O type 448 * and the I/O we issued while in this system call 449 * collided with normal I/O operations... we'll 450 * delay in order to mitigate the impact of this 451 * task on the normal operation of the system 452 */ 453 throttle_lowpri_io(TRUE); 454 } 455 if (__probable(code != 180)) 456 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END, 457 error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0); 458 459 thread_exception_return(); 460 /* NOTREACHED */ 461 } 462 463 464 void 465 unix_syscall_return(int error) 466 { 467 thread_t thread; 468 struct uthread *uthread; 469 struct proc *p; 470 unsigned int code; 471 vm_offset_t params; 472 struct sysent *callp; 473 474 thread = current_thread(); 475 uthread = get_bsdthread_info(thread); 476 477 pal_register_cache_state(thread, DIRTY); 478 479 p = current_proc(); 480 481 if (proc_is64bit(p)) { 482 x86_saved_state64_t *regs; 483 484 regs = saved_state64(find_user_regs(thread)); 485 486 /* reconstruct code for tracing before blasting rax */ 487 code = regs->rax & SYSCALL_NUMBER_MASK; 488 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 489 490 if (callp == sysent) 491 /* 492 * indirect system call... system call number 493 * passed as 'arg0' 494 */ 495 code = regs->rdi; 496 497 #if CONFIG_DTRACE 498 if (callp->sy_call == dtrace_systrace_syscall) 499 dtrace_systrace_syscall_return( code, error, uthread->uu_rval ); 500 #endif /* CONFIG_DTRACE */ 501 AUDIT_SYSCALL_EXIT(code, p, uthread, error); 502 503 if (error == ERESTART) { 504 /* 505 * repeat the syscall 506 */ 507 pal_syscall_restart( thread, find_user_regs(thread) ); 508 } 509 else if (error != EJUSTRETURN) { 510 if (error) { 511 regs->rax = error; 512 regs->isf.rflags |= EFL_CF; /* carry bit */ 513 } else { /* (not error) */ 514 515 switch (callp->sy_return_type) { 516 case _SYSCALL_RET_INT_T: 517 regs->rax = uthread->uu_rval[0]; 518 regs->rdx = uthread->uu_rval[1]; 519 break; 520 case _SYSCALL_RET_UINT_T: 521 regs->rax = ((u_int)uthread->uu_rval[0]); 522 regs->rdx = ((u_int)uthread->uu_rval[1]); 523 break; 524 case _SYSCALL_RET_OFF_T: 525 case _SYSCALL_RET_ADDR_T: 526 case _SYSCALL_RET_SIZE_T: 527 case _SYSCALL_RET_SSIZE_T: 528 case _SYSCALL_RET_UINT64_T: 529 regs->rax = *((uint64_t *)(&uthread->uu_rval[0])); 530 regs->rdx = 0; 531 break; 532 case _SYSCALL_RET_NONE: 533 break; 534 default: 535 panic("unix_syscall: unknown return type"); 536 break; 537 } 538 regs->isf.rflags &= ~EFL_CF; 539 } 540 } 541 DEBUG_KPRINT_SYSCALL_UNIX( 542 "unix_syscall_return: error=%d retval=(%llu,%llu)\n", 543 error, regs->rax, regs->rdx); 544 } else { 545 x86_saved_state32_t *regs; 546 547 regs = saved_state32(find_user_regs(thread)); 548 549 regs->efl &= ~(EFL_CF); 550 /* reconstruct code for tracing before blasting eax */ 551 code = regs->eax & I386_SYSCALL_NUMBER_MASK; 552 callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code]; 553 554 #if CONFIG_DTRACE 555 if (callp->sy_call == dtrace_systrace_syscall) 556 dtrace_systrace_syscall_return( code, error, uthread->uu_rval ); 557 #endif /* CONFIG_DTRACE */ 558 AUDIT_SYSCALL_EXIT(code, p, uthread, error); 559 560 if (callp == sysent) { 561 params = (vm_offset_t) (regs->uesp + sizeof (int)); 562 code = fuword(params); 563 } 564 if (error == ERESTART) { 565 pal_syscall_restart( thread, find_user_regs(thread) ); 566 } 567 else if (error != EJUSTRETURN) { 568 if (error) { 569 regs->eax = error; 570 regs->efl |= EFL_CF; /* carry bit */ 571 } else { /* (not error) */ 572 regs->eax = uthread->uu_rval[0]; 573 regs->edx = uthread->uu_rval[1]; 574 } 575 } 576 DEBUG_KPRINT_SYSCALL_UNIX( 577 "unix_syscall_return: error=%d retval=(%u,%u)\n", 578 error, regs->eax, regs->edx); 579 } 580 581 582 uthread->uu_flag &= ~UT_NOTCANCELPT; 583 584 #if FUNNEL_DEBUG 585 /* 586 * if we're holding the funnel panic 587 */ 588 syscall_exit_funnelcheck(); 589 #endif /* FUNNEL_DEBUG */ 590 591 if (uthread->uu_lowpri_window) { 592 /* 593 * task is marked as a low priority I/O type 594 * and the I/O we issued while in this system call 595 * collided with normal I/O operations... we'll 596 * delay in order to mitigate the impact of this 597 * task on the normal operation of the system 598 */ 599 throttle_lowpri_io(TRUE); 600 } 601 if (code != 180) 602 KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END, 603 error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0); 604 605 thread_exception_return(); 606 /* NOTREACHED */ 607 } 608 609 void 610 munge_wwwlww( 611 __unused const void *in32, 612 void *out64) 613 { 614 uint32_t *arg32; 615 uint64_t *arg64; 616 617 /* we convert in place in out64 */ 618 arg32 = (uint32_t *) out64; 619 arg64 = (uint64_t *) out64; 620 621 arg64[5] = arg32[6]; /* wwwlwW */ 622 arg64[4] = arg32[5]; /* wwwlWw */ 623 arg32[7] = arg32[4]; /* wwwLww (hi) */ 624 arg32[6] = arg32[3]; /* wwwLww (lo) */ 625 arg64[2] = arg32[2]; /* wwWlww */ 626 arg64[1] = arg32[1]; /* wWwlww */ 627 arg64[0] = arg32[0]; /* Wwwlww */ 628 } 629 630 631 void 632 munge_wwlwww( 633 __unused const void *in32, 634 void *out64) 635 { 636 uint32_t *arg32; 637 uint64_t *arg64; 638 639 /* we convert in place in out64 */ 640 arg32 = (uint32_t *) out64; 641 arg64 = (uint64_t *) out64; 642 643 arg64[5] = arg32[6]; /* wwlwwW */ 644 arg64[4] = arg32[5]; /* wwlwWw */ 645 arg64[3] = arg32[4]; /* wwlWww */ 646 arg32[5] = arg32[3]; /* wwLwww (hi) */ 647 arg32[4] = arg32[2]; /* wwLwww (lo) */ 648 arg64[1] = arg32[1]; /* wWlwww */ 649 arg64[0] = arg32[0]; /* Wwlwww */ 650 } 651
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