1 /* Copyright (c) 2005-2008, Google Inc. 2 * All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * --- 31 * Author: Markus Gutschke 32 */ 33 34 /* This file includes Linux-specific support functions common to the 35 * coredumper and the thread lister; primarily, this is a collection 36 * of direct system calls, and a couple of symbols missing from 37 * standard header files. 38 * There are a few options that the including file can set to control 39 * the behavior of this file: 40 * 41 * SYS_CPLUSPLUS: 42 * The entire header file will normally be wrapped in 'extern "C" { }", 43 * making it suitable for compilation as both C and C++ source. If you 44 * do not want to do this, you can set the SYS_CPLUSPLUS macro to inhibit 45 * the wrapping. N.B. doing so will suppress inclusion of all prerequisite 46 * system header files, too. It is the caller's responsibility to provide 47 * the necessary definitions. 48 * 49 * SYS_ERRNO: 50 * All system calls will update "errno" unless overriden by setting the 51 * SYS_ERRNO macro prior to including this file. SYS_ERRNO should be 52 * an l-value. 53 * 54 * SYS_INLINE: 55 * New symbols will be defined "static inline", unless overridden by 56 * the SYS_INLINE macro. 57 * 58 * SYS_LINUX_SYSCALL_SUPPORT_H 59 * This macro is used to avoid multiple inclusions of this header file. 60 * If you need to include this file more than once, make sure to 61 * unset SYS_LINUX_SYSCALL_SUPPORT_H before each inclusion. 62 * 63 * SYS_PREFIX: 64 * New system calls will have a prefix of "sys_" unless overridden by 65 * the SYS_PREFIX macro. Valid values for this macro are [0..9] which 66 * results in prefixes "sys[0..9]_". It is also possible to set this 67 * macro to -1, which avoids all prefixes. 68 * 69 * This file defines a few internal symbols that all start with "LSS_". 70 * Do not access these symbols from outside this file. They are not part 71 * of the supported API. 72 * 73 * NOTE: This is a stripped down version of the official opensource 74 * version of linux_syscall_support.h, which lives at 75 * http://code.google.com/p/linux-syscall-support/ 76 * It includes only the syscalls that are used in perftools, plus a 77 * few extra. Here's the breakdown: 78 * 1) Perftools uses these: grep -rho 'sys_[a-z0-9_A-Z]* *(' src | sort -u 79 * sys__exit( 80 * sys_clone( 81 * sys_close( 82 * sys_fcntl( 83 * sys_fstat( 84 * sys_futex( 85 * sys_futex1( 86 * sys_getcpu( 87 * sys_getdents( 88 * sys_getppid( 89 * sys_gettid( 90 * sys_lseek( 91 * sys_mmap( 92 * sys_mremap( 93 * sys_munmap( 94 * sys_open( 95 * sys_pipe( 96 * sys_prctl( 97 * sys_ptrace( 98 * sys_ptrace_detach( 99 * sys_read( 100 * sys_sched_yield( 101 * sys_sigaction( 102 * sys_sigaltstack( 103 * sys_sigdelset( 104 * sys_sigfillset( 105 * sys_sigprocmask( 106 * sys_socket( 107 * sys_stat( 108 * sys_waitpid( 109 * 2) These are used as subroutines of the above: 110 * sys_getpid -- gettid 111 * sys_kill -- ptrace_detach 112 * sys_restore -- sigaction 113 * sys_restore_rt -- sigaction 114 * sys_socketcall -- socket 115 * sys_wait4 -- waitpid 116 * 3) I left these in even though they're not used. They either 117 * complement the above (write vs read) or are variants (rt_sigaction): 118 * sys_fstat64 119 * sys_getdents64 120 * sys_llseek 121 * sys_mmap2 122 * sys_openat 123 * sys_rt_sigaction 124 * sys_rt_sigprocmask 125 * sys_sigaddset 126 * sys_sigemptyset 127 * sys_stat64 128 * sys_write 129 */ 130 #ifndef SYS_LINUX_SYSCALL_SUPPORT_H 131 #define SYS_LINUX_SYSCALL_SUPPORT_H 132 133 /* We currently only support x86-32, x86-64, ARM, MIPS, and PPC on Linux. 134 * Porting to other related platforms should not be difficult. 135 */ 136 #if (defined(__i386__) || defined(__x86_64__) || defined(__arm__) || \ 137 defined(__mips__) || defined(__PPC__)) && defined(__linux) 138 139 #ifndef SYS_CPLUSPLUS 140 #ifdef __cplusplus 141 /* Some system header files in older versions of gcc neglect to properly 142 * handle being included from C++. As it appears to be harmless to have 143 * multiple nested 'extern "C"' blocks, just add another one here. 144 */ 145 extern "C" { 146 #endif 147 148 #include <errno.h> 149 #include <signal.h> 150 #include <stdarg.h> 151 #include <stddef.h> 152 #include <stdint.h> 153 #include <string.h> 154 #include <sys/ptrace.h> 155 #include <sys/resource.h> 156 #include <sys/time.h> 157 #include <sys/types.h> 158 #if defined(__ANDROID__) 159 #include <sys/syscall.h> 160 #include <sys/linux-syscalls.h> 161 #else 162 #include <syscall.h> 163 #endif 164 #include <unistd.h> 165 #include <linux/unistd.h> 166 #include <endian.h> 167 168 #ifdef __mips__ 169 /* Include definitions of the ABI currently in use. */ 170 #include <sgidefs.h> 171 #endif 172 173 #endif 174 175 /* As glibc often provides subtly incompatible data structures (and implicit 176 * wrapper functions that convert them), we provide our own kernel data 177 * structures for use by the system calls. 178 * These structures have been developed by using Linux 2.6.23 headers for 179 * reference. Note though, we do not care about exact API compatibility 180 * with the kernel, and in fact the kernel often does not have a single 181 * API that works across architectures. Instead, we try to mimic the glibc 182 * API where reasonable, and only guarantee ABI compatibility with the 183 * kernel headers. 184 * Most notably, here are a few changes that were made to the structures 185 * defined by kernel headers: 186 * 187 * - we only define structures, but not symbolic names for kernel data 188 * types. For the latter, we directly use the native C datatype 189 * (i.e. "unsigned" instead of "mode_t"). 190 * - in a few cases, it is possible to define identical structures for 191 * both 32bit (e.g. i386) and 64bit (e.g. x86-64) platforms by 192 * standardizing on the 64bit version of the data types. In particular, 193 * this means that we use "unsigned" where the 32bit headers say 194 * "unsigned long". 195 * - overall, we try to minimize the number of cases where we need to 196 * conditionally define different structures. 197 * - the "struct kernel_sigaction" class of structures have been 198 * modified to more closely mimic glibc's API by introducing an 199 * anonymous union for the function pointer. 200 * - a small number of field names had to have an underscore appended to 201 * them, because glibc defines a global macro by the same name. 202 */ 203 204 /* include/linux/dirent.h */ 205 struct kernel_dirent64 { 206 unsigned long long d_ino; 207 long long d_off; 208 unsigned short d_reclen; 209 unsigned char d_type; 210 char d_name[256]; 211 }; 212 213 /* include/linux/dirent.h */ 214 struct kernel_dirent { 215 long d_ino; 216 long d_off; 217 unsigned short d_reclen; 218 char d_name[256]; 219 }; 220 221 /* include/linux/time.h */ 222 struct kernel_timespec { 223 long tv_sec; 224 long tv_nsec; 225 }; 226 227 /* include/linux/time.h */ 228 struct kernel_timeval { 229 long tv_sec; 230 long tv_usec; 231 }; 232 233 /* include/linux/resource.h */ 234 struct kernel_rusage { 235 struct kernel_timeval ru_utime; 236 struct kernel_timeval ru_stime; 237 long ru_maxrss; 238 long ru_ixrss; 239 long ru_idrss; 240 long ru_isrss; 241 long ru_minflt; 242 long ru_majflt; 243 long ru_nswap; 244 long ru_inblock; 245 long ru_oublock; 246 long ru_msgsnd; 247 long ru_msgrcv; 248 long ru_nsignals; 249 long ru_nvcsw; 250 long ru_nivcsw; 251 }; 252 253 #if defined(__i386__) || defined(__arm__) || defined(__PPC__) 254 255 /* include/asm-{arm,i386,mips,ppc}/signal.h */ 256 struct kernel_old_sigaction { 257 union { 258 void (*sa_handler_)(int); 259 void (*sa_sigaction_)(int, siginfo_t *, void *); 260 }; 261 unsigned long sa_mask; 262 unsigned long sa_flags; 263 void (*sa_restorer)(void); 264 } __attribute__((packed,aligned(4))); 265 #elif (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) 266 #define kernel_old_sigaction kernel_sigaction 267 #endif 268 269 /* Some kernel functions (e.g. sigaction() in 2.6.23) require that the 270 * exactly match the size of the signal set, even though the API was 271 * intended to be extensible. We define our own KERNEL_NSIG to deal with 272 * this. 273 * Please note that glibc provides signals [1.._NSIG-1], whereas the 274 * kernel (and this header) provides the range [1..KERNEL_NSIG]. The 275 * actual number of signals is obviously the same, but the constants 276 * differ by one. 277 */ 278 #ifdef __mips__ 279 #define KERNEL_NSIG 128 280 #else 281 #define KERNEL_NSIG 64 282 #endif 283 284 /* include/asm-{arm,i386,mips,x86_64}/signal.h */ 285 struct kernel_sigset_t { 286 unsigned long sig[(KERNEL_NSIG + 8*sizeof(unsigned long) - 1)/ 287 (8*sizeof(unsigned long))]; 288 }; 289 290 /* include/asm-{arm,i386,mips,x86_64,ppc}/signal.h */ 291 struct kernel_sigaction { 292 #ifdef __mips__ 293 unsigned long sa_flags; 294 union { 295 void (*sa_handler_)(int); 296 void (*sa_sigaction_)(int, siginfo_t *, void *); 297 }; 298 struct kernel_sigset_t sa_mask; 299 #else 300 union { 301 void (*sa_handler_)(int); 302 void (*sa_sigaction_)(int, siginfo_t *, void *); 303 }; 304 unsigned long sa_flags; 305 void (*sa_restorer)(void); 306 struct kernel_sigset_t sa_mask; 307 #endif 308 }; 309 310 /* include/asm-{arm,i386,mips,ppc}/stat.h */ 311 #ifdef __mips__ 312 #if _MIPS_SIM == _MIPS_SIM_ABI64 313 struct kernel_stat { 314 #else 315 struct kernel_stat64 { 316 #endif 317 unsigned st_dev; 318 unsigned __pad0[3]; 319 unsigned long long st_ino; 320 unsigned st_mode; 321 unsigned st_nlink; 322 unsigned st_uid; 323 unsigned st_gid; 324 unsigned st_rdev; 325 unsigned __pad1[3]; 326 long long st_size; 327 unsigned st_atime_; 328 unsigned st_atime_nsec_; 329 unsigned st_mtime_; 330 unsigned st_mtime_nsec_; 331 unsigned st_ctime_; 332 unsigned st_ctime_nsec_; 333 unsigned st_blksize; 334 unsigned __pad2; 335 unsigned long long st_blocks; 336 }; 337 #elif defined __PPC__ 338 struct kernel_stat64 { 339 unsigned long long st_dev; 340 unsigned long long st_ino; 341 unsigned st_mode; 342 unsigned st_nlink; 343 unsigned st_uid; 344 unsigned st_gid; 345 unsigned long long st_rdev; 346 unsigned short int __pad2; 347 long long st_size; 348 long st_blksize; 349 long long st_blocks; 350 long st_atime_; 351 unsigned long st_atime_nsec_; 352 long st_mtime_; 353 unsigned long st_mtime_nsec_; 354 long st_ctime_; 355 unsigned long st_ctime_nsec_; 356 unsigned long __unused4; 357 unsigned long __unused5; 358 }; 359 #else 360 struct kernel_stat64 { 361 unsigned long long st_dev; 362 unsigned char __pad0[4]; 363 unsigned __st_ino; 364 unsigned st_mode; 365 unsigned st_nlink; 366 unsigned st_uid; 367 unsigned st_gid; 368 unsigned long long st_rdev; 369 unsigned char __pad3[4]; 370 long long st_size; 371 unsigned st_blksize; 372 unsigned long long st_blocks; 373 unsigned st_atime_; 374 unsigned st_atime_nsec_; 375 unsigned st_mtime_; 376 unsigned st_mtime_nsec_; 377 unsigned st_ctime_; 378 unsigned st_ctime_nsec_; 379 unsigned long long st_ino; 380 }; 381 #endif 382 383 /* include/asm-{arm,i386,mips,x86_64,ppc}/stat.h */ 384 #if defined(__i386__) || defined(__arm__) 385 struct kernel_stat { 386 /* The kernel headers suggest that st_dev and st_rdev should be 32bit 387 * quantities encoding 12bit major and 20bit minor numbers in an interleaved 388 * format. In reality, we do not see useful data in the top bits. So, 389 * we'll leave the padding in here, until we find a better solution. 390 */ 391 unsigned short st_dev; 392 short pad1; 393 unsigned st_ino; 394 unsigned short st_mode; 395 unsigned short st_nlink; 396 unsigned short st_uid; 397 unsigned short st_gid; 398 unsigned short st_rdev; 399 short pad2; 400 unsigned st_size; 401 unsigned st_blksize; 402 unsigned st_blocks; 403 unsigned st_atime_; 404 unsigned st_atime_nsec_; 405 unsigned st_mtime_; 406 unsigned st_mtime_nsec_; 407 unsigned st_ctime_; 408 unsigned st_ctime_nsec_; 409 unsigned __unused4; 410 unsigned __unused5; 411 }; 412 #elif defined(__x86_64__) 413 struct kernel_stat { 414 uint64_t st_dev; 415 uint64_t st_ino; 416 uint64_t st_nlink; 417 unsigned st_mode; 418 unsigned st_uid; 419 unsigned st_gid; 420 unsigned __pad0; 421 uint64_t st_rdev; 422 int64_t st_size; 423 int64_t st_blksize; 424 int64_t st_blocks; 425 uint64_t st_atime_; 426 uint64_t st_atime_nsec_; 427 uint64_t st_mtime_; 428 uint64_t st_mtime_nsec_; 429 uint64_t st_ctime_; 430 uint64_t st_ctime_nsec_; 431 int64_t __unused[3]; 432 }; 433 #elif defined(__PPC__) 434 struct kernel_stat { 435 unsigned st_dev; 436 unsigned long st_ino; // ino_t 437 unsigned long st_mode; // mode_t 438 unsigned short st_nlink; // nlink_t 439 unsigned st_uid; // uid_t 440 unsigned st_gid; // gid_t 441 unsigned st_rdev; 442 long st_size; // off_t 443 unsigned long st_blksize; 444 unsigned long st_blocks; 445 unsigned long st_atime_; 446 unsigned long st_atime_nsec_; 447 unsigned long st_mtime_; 448 unsigned long st_mtime_nsec_; 449 unsigned long st_ctime_; 450 unsigned long st_ctime_nsec_; 451 unsigned long __unused4; 452 unsigned long __unused5; 453 }; 454 #elif (defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI64) 455 struct kernel_stat { 456 unsigned st_dev; 457 int st_pad1[3]; 458 unsigned st_ino; 459 unsigned st_mode; 460 unsigned st_nlink; 461 unsigned st_uid; 462 unsigned st_gid; 463 unsigned st_rdev; 464 int st_pad2[2]; 465 long st_size; 466 int st_pad3; 467 long st_atime_; 468 long st_atime_nsec_; 469 long st_mtime_; 470 long st_mtime_nsec_; 471 long st_ctime_; 472 long st_ctime_nsec_; 473 int st_blksize; 474 int st_blocks; 475 int st_pad4[14]; 476 }; 477 #endif 478 479 // ulong is not defined in Android while used to define __llseek. 480 #if defined(__ANDROID__) 481 typedef unsigned long int ulong; 482 #endif 483 484 485 /* Definitions missing from the standard header files */ 486 #ifndef O_DIRECTORY 487 #if defined(__arm__) 488 #define O_DIRECTORY 0040000 489 #else 490 #define O_DIRECTORY 0200000 491 #endif 492 #endif 493 #ifndef PR_GET_DUMPABLE 494 #define PR_GET_DUMPABLE 3 495 #endif 496 #ifndef PR_SET_DUMPABLE 497 #define PR_SET_DUMPABLE 4 498 #endif 499 #ifndef AT_FDCWD 500 #define AT_FDCWD (-100) 501 #endif 502 #ifndef AT_SYMLINK_NOFOLLOW 503 #define AT_SYMLINK_NOFOLLOW 0x100 504 #endif 505 #ifndef AT_REMOVEDIR 506 #define AT_REMOVEDIR 0x200 507 #endif 508 #ifndef MREMAP_FIXED 509 #define MREMAP_FIXED 2 510 #endif 511 #ifndef SA_RESTORER 512 #define SA_RESTORER 0x04000000 513 #endif 514 515 #if defined(__i386__) 516 #ifndef __NR_rt_sigaction 517 #define __NR_rt_sigaction 174 518 #define __NR_rt_sigprocmask 175 519 #endif 520 #ifndef __NR_stat64 521 #define __NR_stat64 195 522 #endif 523 #ifndef __NR_fstat64 524 #define __NR_fstat64 197 525 #endif 526 #ifndef __NR_getdents64 527 #define __NR_getdents64 220 528 #endif 529 #ifndef __NR_gettid 530 #define __NR_gettid 224 531 #endif 532 #ifndef __NR_futex 533 #define __NR_futex 240 534 #endif 535 #ifndef __NR_openat 536 #define __NR_openat 295 537 #endif 538 #ifndef __NR_getcpu 539 #define __NR_getcpu 318 540 #endif 541 /* End of i386 definitions */ 542 #elif defined(__arm__) 543 #ifndef __syscall 544 #if defined(__thumb__) || defined(__ARM_EABI__) 545 #define __SYS_REG(name) register long __sysreg __asm__("r6") = __NR_##name; 546 #define __SYS_REG_LIST(regs...) [sysreg] "r" (__sysreg) , ##regs 547 #define __syscall(name) "swi\t0" 548 #define __syscall_safe(name) \ 549 "push {r7}\n" \ 550 "mov r7,%[sysreg]\n" \ 551 __syscall(name)"\n" \ 552 "pop {r7}" 553 #else 554 #define __SYS_REG(name) 555 #define __SYS_REG_LIST(regs...) regs 556 #define __syscall(name) "swi\t" __sys1(__NR_##name) "" 557 #define __syscall_safe(name) __syscall(name) 558 #endif 559 #endif 560 #ifndef __NR_rt_sigaction 561 #define __NR_rt_sigaction (__NR_SYSCALL_BASE + 174) 562 #define __NR_rt_sigprocmask (__NR_SYSCALL_BASE + 175) 563 #endif 564 #ifndef __NR_stat64 565 #define __NR_stat64 (__NR_SYSCALL_BASE + 195) 566 #endif 567 #ifndef __NR_fstat64 568 #define __NR_fstat64 (__NR_SYSCALL_BASE + 197) 569 #endif 570 #ifndef __NR_getdents64 571 #define __NR_getdents64 (__NR_SYSCALL_BASE + 217) 572 #endif 573 #ifndef __NR_gettid 574 #define __NR_gettid (__NR_SYSCALL_BASE + 224) 575 #endif 576 #ifndef __NR_futex 577 #define __NR_futex (__NR_SYSCALL_BASE + 240) 578 #endif 579 /* End of ARM definitions */ 580 #elif defined(__x86_64__) 581 #ifndef __NR_gettid 582 #define __NR_gettid 186 583 #endif 584 #ifndef __NR_futex 585 #define __NR_futex 202 586 #endif 587 #ifndef __NR_getdents64 588 #define __NR_getdents64 217 589 #endif 590 #ifndef __NR_openat 591 #define __NR_openat 257 592 #endif 593 /* End of x86-64 definitions */ 594 #elif defined(__mips__) 595 #if _MIPS_SIM == _MIPS_SIM_ABI32 596 #ifndef __NR_rt_sigaction 597 #define __NR_rt_sigaction (__NR_Linux + 194) 598 #define __NR_rt_sigprocmask (__NR_Linux + 195) 599 #endif 600 #ifndef __NR_stat64 601 #define __NR_stat64 (__NR_Linux + 213) 602 #endif 603 #ifndef __NR_fstat64 604 #define __NR_fstat64 (__NR_Linux + 215) 605 #endif 606 #ifndef __NR_getdents64 607 #define __NR_getdents64 (__NR_Linux + 219) 608 #endif 609 #ifndef __NR_gettid 610 #define __NR_gettid (__NR_Linux + 222) 611 #endif 612 #ifndef __NR_futex 613 #define __NR_futex (__NR_Linux + 238) 614 #endif 615 #ifndef __NR_openat 616 #define __NR_openat (__NR_Linux + 288) 617 #endif 618 #ifndef __NR_fstatat 619 #define __NR_fstatat (__NR_Linux + 293) 620 #endif 621 #ifndef __NR_getcpu 622 #define __NR_getcpu (__NR_Linux + 312) 623 #endif 624 /* End of MIPS (old 32bit API) definitions */ 625 #elif _MIPS_SIM == _MIPS_SIM_ABI64 626 #ifndef __NR_gettid 627 #define __NR_gettid (__NR_Linux + 178) 628 #endif 629 #ifndef __NR_futex 630 #define __NR_futex (__NR_Linux + 194) 631 #endif 632 #ifndef __NR_openat 633 #define __NR_openat (__NR_Linux + 247) 634 #endif 635 #ifndef __NR_fstatat 636 #define __NR_fstatat (__NR_Linux + 252) 637 #endif 638 #ifndef __NR_getcpu 639 #define __NR_getcpu (__NR_Linux + 271) 640 #endif 641 /* End of MIPS (64bit API) definitions */ 642 #else 643 #ifndef __NR_gettid 644 #define __NR_gettid (__NR_Linux + 178) 645 #endif 646 #ifndef __NR_futex 647 #define __NR_futex (__NR_Linux + 194) 648 #endif 649 #ifndef __NR_openat 650 #define __NR_openat (__NR_Linux + 251) 651 #endif 652 #ifndef __NR_fstatat 653 #define __NR_fstatat (__NR_Linux + 256) 654 #endif 655 #ifndef __NR_getcpu 656 #define __NR_getcpu (__NR_Linux + 275) 657 #endif 658 /* End of MIPS (new 32bit API) definitions */ 659 #endif 660 /* End of MIPS definitions */ 661 #elif defined(__PPC__) 662 #ifndef __NR_rt_sigaction 663 #define __NR_rt_sigaction 173 664 #define __NR_rt_sigprocmask 174 665 #endif 666 #ifndef __NR_stat64 667 #define __NR_stat64 195 668 #endif 669 #ifndef __NR_fstat64 670 #define __NR_fstat64 197 671 #endif 672 #ifndef __NR_getdents64 673 #define __NR_getdents64 202 674 #endif 675 #ifndef __NR_gettid 676 #define __NR_gettid 207 677 #endif 678 #ifndef __NR_futex 679 #define __NR_futex 221 680 #endif 681 #ifndef __NR_openat 682 #define __NR_openat 286 683 #endif 684 #ifndef __NR_getcpu 685 #define __NR_getcpu 302 686 #endif 687 /* End of powerpc defininitions */ 688 #endif 689 690 691 /* After forking, we must make sure to only call system calls. */ 692 #if __BOUNDED_POINTERS__ 693 #error "Need to port invocations of syscalls for bounded ptrs" 694 #else 695 /* The core dumper and the thread lister get executed after threads 696 * have been suspended. As a consequence, we cannot call any functions 697 * that acquire locks. Unfortunately, libc wraps most system calls 698 * (e.g. in order to implement pthread_atfork, and to make calls 699 * cancellable), which means we cannot call these functions. Instead, 700 * we have to call syscall() directly. 701 */ 702 #undef LSS_ERRNO 703 #ifdef SYS_ERRNO 704 /* Allow the including file to override the location of errno. This can 705 * be useful when using clone() with the CLONE_VM option. 706 */ 707 #define LSS_ERRNO SYS_ERRNO 708 #else 709 #define LSS_ERRNO errno 710 #endif 711 712 #undef LSS_INLINE 713 #ifdef SYS_INLINE 714 #define LSS_INLINE SYS_INLINE 715 #else 716 #define LSS_INLINE static inline 717 #endif 718 719 /* Allow the including file to override the prefix used for all new 720 * system calls. By default, it will be set to "sys_". 721 */ 722 #undef LSS_NAME 723 #ifndef SYS_PREFIX 724 #define LSS_NAME(name) sys_##name 725 #elif SYS_PREFIX < 0 726 #define LSS_NAME(name) name 727 #elif SYS_PREFIX == 0 728 #define LSS_NAME(name) sys0_##name 729 #elif SYS_PREFIX == 1 730 #define LSS_NAME(name) sys1_##name 731 #elif SYS_PREFIX == 2 732 #define LSS_NAME(name) sys2_##name 733 #elif SYS_PREFIX == 3 734 #define LSS_NAME(name) sys3_##name 735 #elif SYS_PREFIX == 4 736 #define LSS_NAME(name) sys4_##name 737 #elif SYS_PREFIX == 5 738 #define LSS_NAME(name) sys5_##name 739 #elif SYS_PREFIX == 6 740 #define LSS_NAME(name) sys6_##name 741 #elif SYS_PREFIX == 7 742 #define LSS_NAME(name) sys7_##name 743 #elif SYS_PREFIX == 8 744 #define LSS_NAME(name) sys8_##name 745 #elif SYS_PREFIX == 9 746 #define LSS_NAME(name) sys9_##name 747 #endif 748 749 #undef LSS_RETURN 750 #if (defined(__i386__) || defined(__x86_64__) || defined(__arm__)) 751 /* Failing system calls return a negative result in the range of 752 * -1..-4095. These are "errno" values with the sign inverted. 753 */ 754 #define LSS_RETURN(type, res) \ 755 do { \ 756 if ((unsigned long)(res) >= (unsigned long)(-4095)) { \ 757 LSS_ERRNO = -(res); \ 758 res = -1; \ 759 } \ 760 return (type) (res); \ 761 } while (0) 762 #elif defined(__mips__) 763 /* On MIPS, failing system calls return -1, and set errno in a 764 * separate CPU register. 765 */ 766 #define LSS_RETURN(type, res, err) \ 767 do { \ 768 if (err) { \ 769 LSS_ERRNO = (res); \ 770 res = -1; \ 771 } \ 772 return (type) (res); \ 773 } while (0) 774 #elif defined(__PPC__) 775 /* On PPC, failing system calls return -1, and set errno in a 776 * separate CPU register. See linux/unistd.h. 777 */ 778 #define LSS_RETURN(type, res, err) \ 779 do { \ 780 if (err & 0x10000000 ) { \ 781 LSS_ERRNO = (res); \ 782 res = -1; \ 783 } \ 784 return (type) (res); \ 785 } while (0) 786 #endif 787 #if defined(__i386__) 788 #if defined(NO_FRAME_POINTER) && (100 * __GNUC__ + __GNUC_MINOR__ >= 404) 789 /* This only works for GCC-4.4 and above -- the first version to use 790 .cfi directives for dwarf unwind info. */ 791 #define CFI_ADJUST_CFA_OFFSET(adjust) \ 792 ".cfi_adjust_cfa_offset " #adjust "\n" 793 #else 794 #define CFI_ADJUST_CFA_OFFSET(adjust) /**/ 795 #endif 796 797 /* In PIC mode (e.g. when building shared libraries), gcc for i386 798 * reserves ebx. Unfortunately, most distribution ship with implementations 799 * of _syscallX() which clobber ebx. 800 * Also, most definitions of _syscallX() neglect to mark "memory" as being 801 * clobbered. This causes problems with compilers, that do a better job 802 * at optimizing across __asm__ calls. 803 * So, we just have to redefine all of the _syscallX() macros. 804 */ 805 #undef LSS_BODY 806 #define LSS_BODY(type,args...) \ 807 long __res; \ 808 __asm__ __volatile__("push %%ebx\n" \ 809 CFI_ADJUST_CFA_OFFSET(4) \ 810 "movl %2,%%ebx\n" \ 811 "int $0x80\n" \ 812 "pop %%ebx\n" \ 813 CFI_ADJUST_CFA_OFFSET(-4) \ 814 args \ 815 : "esp", "memory"); \ 816 LSS_RETURN(type,__res) 817 #undef _syscall0 818 #define _syscall0(type,name) \ 819 type LSS_NAME(name)(void) { \ 820 long __res; \ 821 __asm__ volatile("int $0x80" \ 822 : "=a" (__res) \ 823 : "0" (__NR_##name) \ 824 : "memory"); \ 825 LSS_RETURN(type,__res); \ 826 } 827 #undef _syscall1 828 #define _syscall1(type,name,type1,arg1) \ 829 type LSS_NAME(name)(type1 arg1) { \ 830 LSS_BODY(type, \ 831 : "=a" (__res) \ 832 : "0" (__NR_##name), "ri" ((long)(arg1))); \ 833 } 834 #undef _syscall2 835 #define _syscall2(type,name,type1,arg1,type2,arg2) \ 836 type LSS_NAME(name)(type1 arg1,type2 arg2) { \ 837 LSS_BODY(type, \ 838 : "=a" (__res) \ 839 : "0" (__NR_##name),"ri" ((long)(arg1)), "c" ((long)(arg2))); \ 840 } 841 #undef _syscall3 842 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ 843 type LSS_NAME(name)(type1 arg1,type2 arg2,type3 arg3) { \ 844 LSS_BODY(type, \ 845 : "=a" (__res) \ 846 : "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)), \ 847 "d" ((long)(arg3))); \ 848 } 849 #undef _syscall4 850 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \ 851 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ 852 LSS_BODY(type, \ 853 : "=a" (__res) \ 854 : "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)), \ 855 "d" ((long)(arg3)),"S" ((long)(arg4))); \ 856 } 857 #undef _syscall5 858 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 859 type5,arg5) \ 860 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 861 type5 arg5) { \ 862 long __res; \ 863 __asm__ __volatile__("push %%ebx\n" \ 864 "movl %2,%%ebx\n" \ 865 "movl %1,%%eax\n" \ 866 "int $0x80\n" \ 867 "pop %%ebx" \ 868 : "=a" (__res) \ 869 : "i" (__NR_##name), "ri" ((long)(arg1)), \ 870 "c" ((long)(arg2)), "d" ((long)(arg3)), \ 871 "S" ((long)(arg4)), "D" ((long)(arg5)) \ 872 : "esp", "memory"); \ 873 LSS_RETURN(type,__res); \ 874 } 875 #undef _syscall6 876 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 877 type5,arg5,type6,arg6) \ 878 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 879 type5 arg5, type6 arg6) { \ 880 long __res; \ 881 struct { long __a1; long __a6; } __s = { (long)arg1, (long) arg6 }; \ 882 __asm__ __volatile__("push %%ebp\n" \ 883 "push %%ebx\n" \ 884 "movl 4(%2),%%ebp\n" \ 885 "movl 0(%2), %%ebx\n" \ 886 "movl %1,%%eax\n" \ 887 "int $0x80\n" \ 888 "pop %%ebx\n" \ 889 "pop %%ebp" \ 890 : "=a" (__res) \ 891 : "i" (__NR_##name), "0" ((long)(&__s)), \ 892 "c" ((long)(arg2)), "d" ((long)(arg3)), \ 893 "S" ((long)(arg4)), "D" ((long)(arg5)) \ 894 : "esp", "memory"); \ 895 LSS_RETURN(type,__res); \ 896 } 897 LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack, 898 int flags, void *arg, int *parent_tidptr, 899 void *newtls, int *child_tidptr) { 900 long __res; 901 __asm__ __volatile__(/* if (fn == NULL) 902 * return -EINVAL; 903 */ 904 "movl %3,%%ecx\n" 905 "jecxz 1f\n" 906 907 /* if (child_stack == NULL) 908 * return -EINVAL; 909 */ 910 "movl %4,%%ecx\n" 911 "jecxz 1f\n" 912 913 /* Set up alignment of the child stack: 914 * child_stack = (child_stack & ~0xF) - 20; 915 */ 916 "andl $-16,%%ecx\n" 917 "subl $20,%%ecx\n" 918 919 /* Push "arg" and "fn" onto the stack that will be 920 * used by the child. 921 */ 922 "movl %6,%%eax\n" 923 "movl %%eax,4(%%ecx)\n" 924 "movl %3,%%eax\n" 925 "movl %%eax,(%%ecx)\n" 926 927 /* %eax = syscall(%eax = __NR_clone, 928 * %ebx = flags, 929 * %ecx = child_stack, 930 * %edx = parent_tidptr, 931 * %esi = newtls, 932 * %edi = child_tidptr) 933 * Also, make sure that %ebx gets preserved as it is 934 * used in PIC mode. 935 */ 936 "movl %8,%%esi\n" 937 "movl %7,%%edx\n" 938 "movl %5,%%eax\n" 939 "movl %9,%%edi\n" 940 "pushl %%ebx\n" 941 "movl %%eax,%%ebx\n" 942 "movl %2,%%eax\n" 943 "int $0x80\n" 944 945 /* In the parent: restore %ebx 946 * In the child: move "fn" into %ebx 947 */ 948 "popl %%ebx\n" 949 950 /* if (%eax != 0) 951 * return %eax; 952 */ 953 "test %%eax,%%eax\n" 954 "jnz 1f\n" 955 956 /* In the child, now. Terminate frame pointer chain. 957 */ 958 "movl $0,%%ebp\n" 959 960 /* Call "fn". "arg" is already on the stack. 961 */ 962 "call *%%ebx\n" 963 964 /* Call _exit(%ebx). Unfortunately older versions 965 * of gcc restrict the number of arguments that can 966 * be passed to asm(). So, we need to hard-code the 967 * system call number. 968 */ 969 "movl %%eax,%%ebx\n" 970 "movl $1,%%eax\n" 971 "int $0x80\n" 972 973 /* Return to parent. 974 */ 975 "1:\n" 976 : "=a" (__res) 977 : "0"(-EINVAL), "i"(__NR_clone), 978 "m"(fn), "m"(child_stack), "m"(flags), "m"(arg), 979 "m"(parent_tidptr), "m"(newtls), "m"(child_tidptr) 980 : "esp", "memory", "ecx", "edx", "esi", "edi"); 981 LSS_RETURN(int, __res); 982 } 983 984 LSS_INLINE void (*LSS_NAME(restore_rt)(void))(void) { 985 /* On i386, the kernel does not know how to return from a signal 986 * handler. Instead, it relies on user space to provide a 987 * restorer function that calls the {rt_,}sigreturn() system call. 988 * Unfortunately, we cannot just reference the glibc version of this 989 * function, as glibc goes out of its way to make it inaccessible. 990 */ 991 void (*res)(void); 992 __asm__ __volatile__("call 2f\n" 993 "0:.align 16\n" 994 "1:movl %1,%%eax\n" 995 "int $0x80\n" 996 "2:popl %0\n" 997 "addl $(1b-0b),%0\n" 998 : "=a" (res) 999 : "i" (__NR_rt_sigreturn)); 1000 return res; 1001 } 1002 LSS_INLINE void (*LSS_NAME(restore)(void))(void) { 1003 /* On i386, the kernel does not know how to return from a signal 1004 * handler. Instead, it relies on user space to provide a 1005 * restorer function that calls the {rt_,}sigreturn() system call. 1006 * Unfortunately, we cannot just reference the glibc version of this 1007 * function, as glibc goes out of its way to make it inaccessible. 1008 */ 1009 void (*res)(void); 1010 __asm__ __volatile__("call 2f\n" 1011 "0:.align 16\n" 1012 "1:pop %%eax\n" 1013 "movl %1,%%eax\n" 1014 "int $0x80\n" 1015 "2:popl %0\n" 1016 "addl $(1b-0b),%0\n" 1017 : "=a" (res) 1018 : "i" (__NR_sigreturn)); 1019 return res; 1020 } 1021 #elif defined(__x86_64__) 1022 /* There are no known problems with any of the _syscallX() macros 1023 * currently shipping for x86_64, but we still need to be able to define 1024 * our own version so that we can override the location of the errno 1025 * location (e.g. when using the clone() system call with the CLONE_VM 1026 * option). 1027 */ 1028 #undef LSS_ENTRYPOINT 1029 #define LSS_ENTRYPOINT "syscall\n" 1030 1031 /* The x32 ABI has 32 bit longs, but the syscall interface is 64 bit. 1032 * We need to explicitly cast to an unsigned 64 bit type to avoid implicit 1033 * sign extension. We can't cast pointers directly because those are 1034 * 32 bits, and gcc will dump ugly warnings about casting from a pointer 1035 * to an integer of a different size. 1036 */ 1037 #undef LSS_SYSCALL_ARG 1038 #define LSS_SYSCALL_ARG(a) ((uint64_t)(uintptr_t)(a)) 1039 #undef _LSS_RETURN 1040 #define _LSS_RETURN(type, res, cast) \ 1041 do { \ 1042 if ((uint64_t)(res) >= (uint64_t)(-4095)) { \ 1043 LSS_ERRNO = -(res); \ 1044 res = -1; \ 1045 } \ 1046 return (type)(cast)(res); \ 1047 } while (0) 1048 #undef LSS_RETURN 1049 #define LSS_RETURN(type, res) _LSS_RETURN(type, res, uintptr_t) 1050 1051 #undef _LSS_BODY 1052 #define _LSS_BODY(nr, type, name, cast, ...) \ 1053 long long __res; \ 1054 __asm__ __volatile__(LSS_BODY_ASM##nr LSS_ENTRYPOINT \ 1055 : "=a" (__res) \ 1056 : "0" (__NR_##name) LSS_BODY_ARG##nr(__VA_ARGS__) \ 1057 : LSS_BODY_CLOBBER##nr "r11", "rcx", "memory"); \ 1058 _LSS_RETURN(type, __res, cast) 1059 #undef LSS_BODY 1060 #define LSS_BODY(nr, type, name, args...) \ 1061 _LSS_BODY(nr, type, name, uintptr_t, ## args) 1062 1063 #undef LSS_BODY_ASM0 1064 #undef LSS_BODY_ASM1 1065 #undef LSS_BODY_ASM2 1066 #undef LSS_BODY_ASM3 1067 #undef LSS_BODY_ASM4 1068 #undef LSS_BODY_ASM5 1069 #undef LSS_BODY_ASM6 1070 #define LSS_BODY_ASM0 1071 #define LSS_BODY_ASM1 LSS_BODY_ASM0 1072 #define LSS_BODY_ASM2 LSS_BODY_ASM1 1073 #define LSS_BODY_ASM3 LSS_BODY_ASM2 1074 #define LSS_BODY_ASM4 LSS_BODY_ASM3 "movq %5,%%r10;" 1075 #define LSS_BODY_ASM5 LSS_BODY_ASM4 "movq %6,%%r8;" 1076 #define LSS_BODY_ASM6 LSS_BODY_ASM5 "movq %7,%%r9;" 1077 1078 #undef LSS_BODY_CLOBBER0 1079 #undef LSS_BODY_CLOBBER1 1080 #undef LSS_BODY_CLOBBER2 1081 #undef LSS_BODY_CLOBBER3 1082 #undef LSS_BODY_CLOBBER4 1083 #undef LSS_BODY_CLOBBER5 1084 #undef LSS_BODY_CLOBBER6 1085 #define LSS_BODY_CLOBBER0 1086 #define LSS_BODY_CLOBBER1 LSS_BODY_CLOBBER0 1087 #define LSS_BODY_CLOBBER2 LSS_BODY_CLOBBER1 1088 #define LSS_BODY_CLOBBER3 LSS_BODY_CLOBBER2 1089 #define LSS_BODY_CLOBBER4 LSS_BODY_CLOBBER3 "r10", 1090 #define LSS_BODY_CLOBBER5 LSS_BODY_CLOBBER4 "r8", 1091 #define LSS_BODY_CLOBBER6 LSS_BODY_CLOBBER5 "r9", 1092 1093 #undef LSS_BODY_ARG0 1094 #undef LSS_BODY_ARG1 1095 #undef LSS_BODY_ARG2 1096 #undef LSS_BODY_ARG3 1097 #undef LSS_BODY_ARG4 1098 #undef LSS_BODY_ARG5 1099 #undef LSS_BODY_ARG6 1100 #define LSS_BODY_ARG0() 1101 #define LSS_BODY_ARG1(arg1) \ 1102 LSS_BODY_ARG0(), "D" (arg1) 1103 #define LSS_BODY_ARG2(arg1, arg2) \ 1104 LSS_BODY_ARG1(arg1), "S" (arg2) 1105 #define LSS_BODY_ARG3(arg1, arg2, arg3) \ 1106 LSS_BODY_ARG2(arg1, arg2), "d" (arg3) 1107 #define LSS_BODY_ARG4(arg1, arg2, arg3, arg4) \ 1108 LSS_BODY_ARG3(arg1, arg2, arg3), "r" (arg4) 1109 #define LSS_BODY_ARG5(arg1, arg2, arg3, arg4, arg5) \ 1110 LSS_BODY_ARG4(arg1, arg2, arg3, arg4), "r" (arg5) 1111 #define LSS_BODY_ARG6(arg1, arg2, arg3, arg4, arg5, arg6) \ 1112 LSS_BODY_ARG5(arg1, arg2, arg3, arg4, arg5), "r" (arg6) 1113 1114 #undef _syscall0 1115 #define _syscall0(type,name) \ 1116 type LSS_NAME(name)() { \ 1117 LSS_BODY(0, type, name); \ 1118 } 1119 #undef _syscall1 1120 #define _syscall1(type,name,type1,arg1) \ 1121 type LSS_NAME(name)(type1 arg1) { \ 1122 LSS_BODY(1, type, name, LSS_SYSCALL_ARG(arg1)); \ 1123 } 1124 #undef _syscall2 1125 #define _syscall2(type,name,type1,arg1,type2,arg2) \ 1126 type LSS_NAME(name)(type1 arg1, type2 arg2) { \ 1127 LSS_BODY(2, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2));\ 1128 } 1129 #undef _syscall3 1130 #define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ 1131 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \ 1132 LSS_BODY(3, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \ 1133 LSS_SYSCALL_ARG(arg3)); \ 1134 } 1135 #undef _syscall4 1136 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \ 1137 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ 1138 LSS_BODY(4, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \ 1139 LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4));\ 1140 } 1141 #undef _syscall5 1142 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1143 type5,arg5) \ 1144 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1145 type5 arg5) { \ 1146 LSS_BODY(5, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \ 1147 LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4), \ 1148 LSS_SYSCALL_ARG(arg5)); \ 1149 } 1150 #undef _syscall6 1151 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1152 type5,arg5,type6,arg6) \ 1153 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1154 type5 arg5, type6 arg6) { \ 1155 LSS_BODY(6, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \ 1156 LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4), \ 1157 LSS_SYSCALL_ARG(arg5), LSS_SYSCALL_ARG(arg6));\ 1158 } 1159 LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack, 1160 int flags, void *arg, int *parent_tidptr, 1161 void *newtls, int *child_tidptr) { 1162 long long __res; 1163 { 1164 __asm__ __volatile__(/* if (fn == NULL) 1165 * return -EINVAL; 1166 */ 1167 "testq %4,%4\n" 1168 "jz 1f\n" 1169 1170 /* if (child_stack == NULL) 1171 * return -EINVAL; 1172 */ 1173 "testq %5,%5\n" 1174 "jz 1f\n" 1175 1176 /* Set up alignment of the child stack: 1177 * child_stack = (child_stack & ~0xF) - 16; 1178 */ 1179 "andq $-16,%5\n" 1180 "subq $16,%5\n" 1181 1182 /* Push "arg" and "fn" onto the stack that will be 1183 * used by the child. 1184 */ 1185 "movq %7,8(%5)\n" 1186 "movq %4,0(%5)\n" 1187 1188 /* %rax = syscall(%rax = __NR_clone, 1189 * %rdi = flags, 1190 * %rsi = child_stack, 1191 * %rdx = parent_tidptr, 1192 * %r8 = new_tls, 1193 * %r10 = child_tidptr) 1194 */ 1195 "movq %2,%%rax\n" 1196 "movq %9,%%r8\n" 1197 "movq %10,%%r10\n" 1198 "syscall\n" 1199 1200 /* if (%rax != 0) 1201 * return; 1202 */ 1203 "testq %%rax,%%rax\n" 1204 "jnz 1f\n" 1205 1206 /* In the child. Terminate frame pointer chain. 1207 */ 1208 "xorq %%rbp,%%rbp\n" 1209 1210 /* Call "fn(arg)". 1211 */ 1212 "popq %%rax\n" 1213 "popq %%rdi\n" 1214 "call *%%rax\n" 1215 1216 /* Call _exit(%ebx). 1217 */ 1218 "movq %%rax,%%rdi\n" 1219 "movq %3,%%rax\n" 1220 "syscall\n" 1221 1222 /* Return to parent. 1223 */ 1224 "1:\n" 1225 : "=a" (__res) 1226 : "0"(-EINVAL), "i"(__NR_clone), "i"(__NR_exit), 1227 "r"(LSS_SYSCALL_ARG(fn)), 1228 "S"(LSS_SYSCALL_ARG(child_stack)), 1229 "D"(LSS_SYSCALL_ARG(flags)), 1230 "r"(LSS_SYSCALL_ARG(arg)), 1231 "d"(LSS_SYSCALL_ARG(parent_tidptr)), 1232 "r"(LSS_SYSCALL_ARG(newtls)), 1233 "r"(LSS_SYSCALL_ARG(child_tidptr)) 1234 : "rsp", "memory", "r8", "r10", "r11", "rcx"); 1235 } 1236 LSS_RETURN(int, __res); 1237 } 1238 1239 LSS_INLINE void (*LSS_NAME(restore_rt)(void))(void) { 1240 /* On x86-64, the kernel does not know how to return from 1241 * a signal handler. Instead, it relies on user space to provide a 1242 * restorer function that calls the rt_sigreturn() system call. 1243 * Unfortunately, we cannot just reference the glibc version of this 1244 * function, as glibc goes out of its way to make it inaccessible. 1245 */ 1246 long long res; 1247 __asm__ __volatile__("call 2f\n" 1248 "0:.align 16\n" 1249 "1:movq %1,%%rax\n" 1250 "syscall\n" 1251 "2:popq %0\n" 1252 "addq $(1b-0b),%0\n" 1253 : "=a" (res) 1254 : "i" (__NR_rt_sigreturn)); 1255 return (void (*)(void))(uintptr_t)res; 1256 } 1257 #elif defined(__arm__) 1258 /* Most definitions of _syscallX() neglect to mark "memory" as being 1259 * clobbered. This causes problems with compilers, that do a better job 1260 * at optimizing across __asm__ calls. 1261 * So, we just have to redefine all fo the _syscallX() macros. 1262 */ 1263 #undef LSS_REG 1264 #define LSS_REG(r,a) register long __r##r __asm__("r"#r) = (long)a 1265 1266 /* r0..r3 are scratch registers and not preserved across function 1267 * calls. We need to first evaluate the first 4 syscall arguments 1268 * and store them on stack. They must be loaded into r0..r3 after 1269 * all function calls to avoid r0..r3 being clobbered. 1270 */ 1271 #undef LSS_SAVE_ARG 1272 #define LSS_SAVE_ARG(r,a) long __tmp##r = (long)a 1273 #undef LSS_LOAD_ARG 1274 #define LSS_LOAD_ARG(r) register long __r##r __asm__("r"#r) = __tmp##r 1275 1276 #undef LSS_BODY 1277 #define LSS_BODY(type, name, args...) \ 1278 register long __res_r0 __asm__("r0"); \ 1279 long __res; \ 1280 __SYS_REG(name) \ 1281 __asm__ __volatile__ (__syscall_safe(name) \ 1282 : "=r"(__res_r0) \ 1283 : __SYS_REG_LIST(args) \ 1284 : "lr", "memory"); \ 1285 __res = __res_r0; \ 1286 LSS_RETURN(type, __res) 1287 #undef _syscall0 1288 #define _syscall0(type, name) \ 1289 type LSS_NAME(name)() { \ 1290 LSS_BODY(type, name); \ 1291 } 1292 #undef _syscall1 1293 #define _syscall1(type, name, type1, arg1) \ 1294 type LSS_NAME(name)(type1 arg1) { \ 1295 /* There is no need for using a volatile temp. */ \ 1296 LSS_REG(0, arg1); \ 1297 LSS_BODY(type, name, "r"(__r0)); \ 1298 } 1299 #undef _syscall2 1300 #define _syscall2(type, name, type1, arg1, type2, arg2) \ 1301 type LSS_NAME(name)(type1 arg1, type2 arg2) { \ 1302 LSS_SAVE_ARG(0, arg1); \ 1303 LSS_SAVE_ARG(1, arg2); \ 1304 LSS_LOAD_ARG(0); \ 1305 LSS_LOAD_ARG(1); \ 1306 LSS_BODY(type, name, "r"(__r0), "r"(__r1)); \ 1307 } 1308 #undef _syscall3 1309 #define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \ 1310 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \ 1311 LSS_SAVE_ARG(0, arg1); \ 1312 LSS_SAVE_ARG(1, arg2); \ 1313 LSS_SAVE_ARG(2, arg3); \ 1314 LSS_LOAD_ARG(0); \ 1315 LSS_LOAD_ARG(1); \ 1316 LSS_LOAD_ARG(2); \ 1317 LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2)); \ 1318 } 1319 #undef _syscall4 1320 #define _syscall4(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1321 type4, arg4) \ 1322 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ 1323 LSS_SAVE_ARG(0, arg1); \ 1324 LSS_SAVE_ARG(1, arg2); \ 1325 LSS_SAVE_ARG(2, arg3); \ 1326 LSS_SAVE_ARG(3, arg4); \ 1327 LSS_LOAD_ARG(0); \ 1328 LSS_LOAD_ARG(1); \ 1329 LSS_LOAD_ARG(2); \ 1330 LSS_LOAD_ARG(3); \ 1331 LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3)); \ 1332 } 1333 #undef _syscall5 1334 #define _syscall5(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1335 type4, arg4, type5, arg5) \ 1336 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1337 type5 arg5) { \ 1338 LSS_SAVE_ARG(0, arg1); \ 1339 LSS_SAVE_ARG(1, arg2); \ 1340 LSS_SAVE_ARG(2, arg3); \ 1341 LSS_SAVE_ARG(3, arg4); \ 1342 LSS_REG(4, arg5); \ 1343 LSS_LOAD_ARG(0); \ 1344 LSS_LOAD_ARG(1); \ 1345 LSS_LOAD_ARG(2); \ 1346 LSS_LOAD_ARG(3); \ 1347 LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3), \ 1348 "r"(__r4)); \ 1349 } 1350 #undef _syscall6 1351 #define _syscall6(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1352 type4, arg4, type5, arg5, type6, arg6) \ 1353 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1354 type5 arg5, type6 arg6) { \ 1355 LSS_SAVE_ARG(0, arg1); \ 1356 LSS_SAVE_ARG(1, arg2); \ 1357 LSS_SAVE_ARG(2, arg3); \ 1358 LSS_SAVE_ARG(3, arg4); \ 1359 LSS_REG(4, arg5); \ 1360 LSS_REG(5, arg6); \ 1361 LSS_LOAD_ARG(0); \ 1362 LSS_LOAD_ARG(1); \ 1363 LSS_LOAD_ARG(2); \ 1364 LSS_LOAD_ARG(3); \ 1365 LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3), \ 1366 "r"(__r4), "r"(__r5)); \ 1367 } 1368 LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack, 1369 int flags, void *arg, int *parent_tidptr, 1370 void *newtls, int *child_tidptr) { 1371 register long __res __asm__("r5"); 1372 { 1373 if (fn == NULL || child_stack == NULL) { 1374 __res = -EINVAL; 1375 goto clone_exit; 1376 } 1377 1378 /* stash first 4 arguments on stack first because we can only load 1379 * them after all function calls. 1380 */ 1381 int tmp_flags = flags; 1382 int * tmp_stack = (int*) child_stack; 1383 void * tmp_ptid = parent_tidptr; 1384 void * tmp_tls = newtls; 1385 1386 register int *__ctid __asm__("r4") = child_tidptr; 1387 1388 /* Push "arg" and "fn" onto the stack that will be 1389 * used by the child. 1390 */ 1391 *(--tmp_stack) = (int) arg; 1392 *(--tmp_stack) = (int) fn; 1393 1394 /* We must load r0..r3 last after all possible function calls. */ 1395 register int __flags __asm__("r0") = tmp_flags; 1396 register void *__stack __asm__("r1") = tmp_stack; 1397 register void *__ptid __asm__("r2") = tmp_ptid; 1398 register void *__tls __asm__("r3") = tmp_tls; 1399 1400 /* %r0 = syscall(%r0 = flags, 1401 * %r1 = child_stack, 1402 * %r2 = parent_tidptr, 1403 * %r3 = newtls, 1404 * %r4 = child_tidptr) 1405 */ 1406 __SYS_REG(clone) 1407 __asm__ __volatile__(/* %r0 = syscall(%r0 = flags, 1408 * %r1 = child_stack, 1409 * %r2 = parent_tidptr, 1410 * %r3 = newtls, 1411 * %r4 = child_tidptr) 1412 */ 1413 "push {r7}\n" 1414 "mov r7,%1\n" 1415 __syscall(clone)"\n" 1416 1417 /* if (%r0 != 0) 1418 * return %r0; 1419 */ 1420 "movs %0,r0\n" 1421 "bne 1f\n" 1422 1423 /* In the child, now. Call "fn(arg)". 1424 */ 1425 "ldr r0,[sp, #4]\n" 1426 "mov lr,pc\n" 1427 "ldr pc,[sp]\n" 1428 1429 /* Call _exit(%r0), which never returns. We only 1430 * need to set r7 for EABI syscall ABI but we do 1431 * this always to simplify code sharing between 1432 * old and new syscall ABIs. 1433 */ 1434 "mov r7,%2\n" 1435 __syscall(exit)"\n" 1436 1437 /* Pop r7 from the stack only in the parent. 1438 */ 1439 "1: pop {r7}\n" 1440 : "=r" (__res) 1441 : "r"(__sysreg), 1442 "i"(__NR_exit), "r"(__stack), "r"(__flags), 1443 "r"(__ptid), "r"(__tls), "r"(__ctid) 1444 : "cc", "lr", "memory"); 1445 } 1446 clone_exit: 1447 LSS_RETURN(int, __res); 1448 } 1449 #elif defined(__mips__) 1450 #undef LSS_REG 1451 #define LSS_REG(r,a) register unsigned long __r##r __asm__("$"#r) = \ 1452 (unsigned long)(a) 1453 1454 #if _MIPS_SIM == _MIPS_SIM_ABI32 1455 // See http://sources.redhat.com/ml/libc-alpha/2004-10/msg00050.html 1456 // or http://www.linux-mips.org/archives/linux-mips/2004-10/msg00142.html 1457 #define MIPS_SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12",\ 1458 "$13", "$14", "$15", "$24", "$25", "memory" 1459 #else 1460 #define MIPS_SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \ 1461 "$14", "$15", "$24", "$25", "memory" 1462 #endif 1463 1464 #undef LSS_BODY 1465 #define LSS_BODY(type,name,r7,...) \ 1466 register unsigned long __v0 __asm__("$2") = __NR_##name; \ 1467 __asm__ __volatile__ ("syscall\n" \ 1468 : "=&r"(__v0), r7 (__r7) \ 1469 : "0"(__v0), ##__VA_ARGS__ \ 1470 : MIPS_SYSCALL_CLOBBERS); \ 1471 LSS_RETURN(type, __v0, __r7) 1472 #undef _syscall0 1473 #define _syscall0(type, name) \ 1474 type LSS_NAME(name)() { \ 1475 register unsigned long __r7 __asm__("$7"); \ 1476 LSS_BODY(type, name, "=r"); \ 1477 } 1478 #undef _syscall1 1479 #define _syscall1(type, name, type1, arg1) \ 1480 type LSS_NAME(name)(type1 arg1) { \ 1481 register unsigned long __r7 __asm__("$7"); \ 1482 LSS_REG(4, arg1); LSS_BODY(type, name, "=r", "r"(__r4)); \ 1483 } 1484 #undef _syscall2 1485 #define _syscall2(type, name, type1, arg1, type2, arg2) \ 1486 type LSS_NAME(name)(type1 arg1, type2 arg2) { \ 1487 register unsigned long __r7 __asm__("$7"); \ 1488 LSS_REG(4, arg1); LSS_REG(5, arg2); \ 1489 LSS_BODY(type, name, "=r", "r"(__r4), "r"(__r5)); \ 1490 } 1491 #undef _syscall3 1492 #define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \ 1493 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \ 1494 register unsigned long __r7 __asm__("$7"); \ 1495 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1496 LSS_BODY(type, name, "=r", "r"(__r4), "r"(__r5), "r"(__r6)); \ 1497 } 1498 #undef _syscall4 1499 #define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \ 1500 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ 1501 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1502 LSS_REG(7, arg4); \ 1503 LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6)); \ 1504 } 1505 #undef _syscall5 1506 #if _MIPS_SIM == _MIPS_SIM_ABI32 1507 /* The old 32bit MIPS system call API passes the fifth and sixth argument 1508 * on the stack, whereas the new APIs use registers "r8" and "r9". 1509 */ 1510 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1511 type5,arg5) \ 1512 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1513 type5 arg5) { \ 1514 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1515 LSS_REG(7, arg4); \ 1516 register unsigned long __v0 __asm__("$2"); \ 1517 __asm__ __volatile__ (".set noreorder\n" \ 1518 "lw $2, %6\n" \ 1519 "subu $29, 32\n" \ 1520 "sw $2, 16($29)\n" \ 1521 "li $2, %2\n" \ 1522 "syscall\n" \ 1523 "addiu $29, 32\n" \ 1524 ".set reorder\n" \ 1525 : "=&r"(__v0), "+r" (__r7) \ 1526 : "i" (__NR_##name), "r"(__r4), "r"(__r5), \ 1527 "r"(__r6), "m" ((unsigned long)arg5) \ 1528 : MIPS_SYSCALL_CLOBBERS); \ 1529 LSS_RETURN(type, __v0, __r7); \ 1530 } 1531 #else 1532 #define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1533 type5,arg5) \ 1534 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1535 type5 arg5) { \ 1536 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1537 LSS_REG(7, arg4); LSS_REG(8, arg5); \ 1538 LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6), \ 1539 "r"(__r8)); \ 1540 } 1541 #endif 1542 #undef _syscall6 1543 #if _MIPS_SIM == _MIPS_SIM_ABI32 1544 /* The old 32bit MIPS system call API passes the fifth and sixth argument 1545 * on the stack, whereas the new APIs use registers "r8" and "r9". 1546 */ 1547 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1548 type5,arg5,type6,arg6) \ 1549 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1550 type5 arg5, type6 arg6) { \ 1551 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1552 LSS_REG(7, arg4); \ 1553 register unsigned long __v0 __asm__("$2"); \ 1554 __asm__ __volatile__ (".set noreorder\n" \ 1555 "lw $2, %6\n" \ 1556 "lw $8, %7\n" \ 1557 "subu $29, 32\n" \ 1558 "sw $2, 16($29)\n" \ 1559 "sw $8, 20($29)\n" \ 1560 "li $2, %2\n" \ 1561 "syscall\n" \ 1562 "addiu $29, 32\n" \ 1563 ".set reorder\n" \ 1564 : "=&r"(__v0), "+r" (__r7) \ 1565 : "i" (__NR_##name), "r"(__r4), "r"(__r5), \ 1566 "r"(__r6), "r" ((unsigned long)arg5), \ 1567 "r" ((unsigned long)arg6) \ 1568 : MIPS_SYSCALL_CLOBBERS); \ 1569 LSS_RETURN(type, __v0, __r7); \ 1570 } 1571 #else 1572 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ 1573 type5,arg5,type6,arg6) \ 1574 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1575 type5 arg5,type6 arg6) { \ 1576 LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \ 1577 LSS_REG(7, arg4); LSS_REG(8, arg5); LSS_REG(9, arg6); \ 1578 LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6), \ 1579 "r"(__r8), "r"(__r9)); \ 1580 } 1581 #endif 1582 LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack, 1583 int flags, void *arg, int *parent_tidptr, 1584 void *newtls, int *child_tidptr) { 1585 register unsigned long __v0 __asm__("$2"); 1586 register unsigned long __r7 __asm__("$7") = (unsigned long)newtls; 1587 { 1588 register int __flags __asm__("$4") = flags; 1589 register void *__stack __asm__("$5") = child_stack; 1590 register void *__ptid __asm__("$6") = parent_tidptr; 1591 register int *__ctid __asm__("$8") = child_tidptr; 1592 __asm__ __volatile__( 1593 #if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32 1594 "subu $29,24\n" 1595 #elif _MIPS_SIM == _MIPS_SIM_NABI32 1596 "sub $29,16\n" 1597 #else 1598 "dsubu $29,16\n" 1599 #endif 1600 1601 /* if (fn == NULL || child_stack == NULL) 1602 * return -EINVAL; 1603 */ 1604 "li %0,%2\n" 1605 "beqz %5,1f\n" 1606 "beqz %6,1f\n" 1607 1608 /* Push "arg" and "fn" onto the stack that will be 1609 * used by the child. 1610 */ 1611 #if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32 1612 "subu %6,32\n" 1613 "sw %5,0(%6)\n" 1614 "sw %8,4(%6)\n" 1615 #elif _MIPS_SIM == _MIPS_SIM_NABI32 1616 "sub %6,32\n" 1617 "sw %5,0(%6)\n" 1618 "sw %8,8(%6)\n" 1619 #else 1620 "dsubu %6,32\n" 1621 "sd %5,0(%6)\n" 1622 "sd %8,8(%6)\n" 1623 #endif 1624 1625 /* $7 = syscall($4 = flags, 1626 * $5 = child_stack, 1627 * $6 = parent_tidptr, 1628 * $7 = newtls, 1629 * $8 = child_tidptr) 1630 */ 1631 "li $2,%3\n" 1632 "syscall\n" 1633 1634 /* if ($7 != 0) 1635 * return $2; 1636 */ 1637 "bnez $7,1f\n" 1638 "bnez $2,1f\n" 1639 1640 /* In the child, now. Call "fn(arg)". 1641 */ 1642 #if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32 1643 "lw $25,0($29)\n" 1644 "lw $4,4($29)\n" 1645 #elif _MIPS_SIM == _MIPS_SIM_NABI32 1646 "lw $25,0($29)\n" 1647 "lw $4,8($29)\n" 1648 #else 1649 "ld $25,0($29)\n" 1650 "ld $4,8($29)\n" 1651 #endif 1652 "jalr $25\n" 1653 1654 /* Call _exit($2) 1655 */ 1656 "move $4,$2\n" 1657 "li $2,%4\n" 1658 "syscall\n" 1659 1660 "1:\n" 1661 #if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32 1662 "addu $29, 24\n" 1663 #elif _MIPS_SIM == _MIPS_SIM_NABI32 1664 "add $29, 16\n" 1665 #else 1666 "daddu $29,16\n" 1667 #endif 1668 : "=&r" (__v0), "=r" (__r7) 1669 : "i"(-EINVAL), "i"(__NR_clone), "i"(__NR_exit), 1670 "r"(fn), "r"(__stack), "r"(__flags), "r"(arg), 1671 "r"(__ptid), "r"(__r7), "r"(__ctid) 1672 : "$9", "$10", "$11", "$12", "$13", "$14", "$15", 1673 "$24", "memory"); 1674 } 1675 LSS_RETURN(int, __v0, __r7); 1676 } 1677 #elif defined (__PPC__) 1678 #undef LSS_LOADARGS_0 1679 #define LSS_LOADARGS_0(name, dummy...) \ 1680 __sc_0 = __NR_##name 1681 #undef LSS_LOADARGS_1 1682 #define LSS_LOADARGS_1(name, arg1) \ 1683 LSS_LOADARGS_0(name); \ 1684 __sc_3 = (unsigned long) (arg1) 1685 #undef LSS_LOADARGS_2 1686 #define LSS_LOADARGS_2(name, arg1, arg2) \ 1687 LSS_LOADARGS_1(name, arg1); \ 1688 __sc_4 = (unsigned long) (arg2) 1689 #undef LSS_LOADARGS_3 1690 #define LSS_LOADARGS_3(name, arg1, arg2, arg3) \ 1691 LSS_LOADARGS_2(name, arg1, arg2); \ 1692 __sc_5 = (unsigned long) (arg3) 1693 #undef LSS_LOADARGS_4 1694 #define LSS_LOADARGS_4(name, arg1, arg2, arg3, arg4) \ 1695 LSS_LOADARGS_3(name, arg1, arg2, arg3); \ 1696 __sc_6 = (unsigned long) (arg4) 1697 #undef LSS_LOADARGS_5 1698 #define LSS_LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5) \ 1699 LSS_LOADARGS_4(name, arg1, arg2, arg3, arg4); \ 1700 __sc_7 = (unsigned long) (arg5) 1701 #undef LSS_LOADARGS_6 1702 #define LSS_LOADARGS_6(name, arg1, arg2, arg3, arg4, arg5, arg6) \ 1703 LSS_LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5); \ 1704 __sc_8 = (unsigned long) (arg6) 1705 #undef LSS_ASMINPUT_0 1706 #define LSS_ASMINPUT_0 "0" (__sc_0) 1707 #undef LSS_ASMINPUT_1 1708 #define LSS_ASMINPUT_1 LSS_ASMINPUT_0, "1" (__sc_3) 1709 #undef LSS_ASMINPUT_2 1710 #define LSS_ASMINPUT_2 LSS_ASMINPUT_1, "2" (__sc_4) 1711 #undef LSS_ASMINPUT_3 1712 #define LSS_ASMINPUT_3 LSS_ASMINPUT_2, "3" (__sc_5) 1713 #undef LSS_ASMINPUT_4 1714 #define LSS_ASMINPUT_4 LSS_ASMINPUT_3, "4" (__sc_6) 1715 #undef LSS_ASMINPUT_5 1716 #define LSS_ASMINPUT_5 LSS_ASMINPUT_4, "5" (__sc_7) 1717 #undef LSS_ASMINPUT_6 1718 #define LSS_ASMINPUT_6 LSS_ASMINPUT_5, "6" (__sc_8) 1719 #undef LSS_BODY 1720 #define LSS_BODY(nr, type, name, args...) \ 1721 long __sc_ret, __sc_err; \ 1722 { \ 1723 register unsigned long __sc_0 __asm__ ("r0"); \ 1724 register unsigned long __sc_3 __asm__ ("r3"); \ 1725 register unsigned long __sc_4 __asm__ ("r4"); \ 1726 register unsigned long __sc_5 __asm__ ("r5"); \ 1727 register unsigned long __sc_6 __asm__ ("r6"); \ 1728 register unsigned long __sc_7 __asm__ ("r7"); \ 1729 register unsigned long __sc_8 __asm__ ("r8"); \ 1730 \ 1731 LSS_LOADARGS_##nr(name, args); \ 1732 __asm__ __volatile__ \ 1733 ("sc\n\t" \ 1734 "mfcr %0" \ 1735 : "=&r" (__sc_0), \ 1736 "=&r" (__sc_3), "=&r" (__sc_4), \ 1737 "=&r" (__sc_5), "=&r" (__sc_6), \ 1738 "=&r" (__sc_7), "=&r" (__sc_8) \ 1739 : LSS_ASMINPUT_##nr \ 1740 : "cr0", "ctr", "memory", \ 1741 "r9", "r10", "r11", "r12"); \ 1742 __sc_ret = __sc_3; \ 1743 __sc_err = __sc_0; \ 1744 } \ 1745 LSS_RETURN(type, __sc_ret, __sc_err) 1746 #undef _syscall0 1747 #define _syscall0(type, name) \ 1748 type LSS_NAME(name)(void) { \ 1749 LSS_BODY(0, type, name); \ 1750 } 1751 #undef _syscall1 1752 #define _syscall1(type, name, type1, arg1) \ 1753 type LSS_NAME(name)(type1 arg1) { \ 1754 LSS_BODY(1, type, name, arg1); \ 1755 } 1756 #undef _syscall2 1757 #define _syscall2(type, name, type1, arg1, type2, arg2) \ 1758 type LSS_NAME(name)(type1 arg1, type2 arg2) { \ 1759 LSS_BODY(2, type, name, arg1, arg2); \ 1760 } 1761 #undef _syscall3 1762 #define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \ 1763 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \ 1764 LSS_BODY(3, type, name, arg1, arg2, arg3); \ 1765 } 1766 #undef _syscall4 1767 #define _syscall4(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1768 type4, arg4) \ 1769 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \ 1770 LSS_BODY(4, type, name, arg1, arg2, arg3, arg4); \ 1771 } 1772 #undef _syscall5 1773 #define _syscall5(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1774 type4, arg4, type5, arg5) \ 1775 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1776 type5 arg5) { \ 1777 LSS_BODY(5, type, name, arg1, arg2, arg3, arg4, arg5); \ 1778 } 1779 #undef _syscall6 1780 #define _syscall6(type, name, type1, arg1, type2, arg2, type3, arg3, \ 1781 type4, arg4, type5, arg5, type6, arg6) \ 1782 type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \ 1783 type5 arg5, type6 arg6) { \ 1784 LSS_BODY(6, type, name, arg1, arg2, arg3, arg4, arg5, arg6); \ 1785 } 1786 /* clone function adapted from glibc 2.3.6 clone.S */ 1787 /* TODO(csilvers): consider wrapping some args up in a struct, like we 1788 * do for i386's _syscall6, so we can compile successfully on gcc 2.95 1789 */ 1790 LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack, 1791 int flags, void *arg, int *parent_tidptr, 1792 void *newtls, int *child_tidptr) { 1793 long __ret, __err; 1794 { 1795 register int (*__fn)(void *) __asm__ ("r8") = fn; 1796 register void *__cstack __asm__ ("r4") = child_stack; 1797 register int __flags __asm__ ("r3") = flags; 1798 register void * __arg __asm__ ("r9") = arg; 1799 register int * __ptidptr __asm__ ("r5") = parent_tidptr; 1800 register void * __newtls __asm__ ("r6") = newtls; 1801 register int * __ctidptr __asm__ ("r7") = child_tidptr; 1802 __asm__ __volatile__( 1803 /* check for fn == NULL 1804 * and child_stack == NULL 1805 */ 1806 "cmpwi cr0, %6, 0\n\t" 1807 "cmpwi cr1, %7, 0\n\t" 1808 "cror cr0*4+eq, cr1*4+eq, cr0*4+eq\n\t" 1809 "beq- cr0, 1f\n\t" 1810 1811 /* set up stack frame for child */ 1812 "clrrwi %7, %7, 4\n\t" 1813 "li 0, 0\n\t" 1814 "stwu 0, -16(%7)\n\t" 1815 1816 /* fn, arg, child_stack are saved across the syscall: r28-30 */ 1817 "mr 28, %6\n\t" 1818 "mr 29, %7\n\t" 1819 "mr 27, %9\n\t" 1820 1821 /* syscall */ 1822 "li 0, %4\n\t" 1823 /* flags already in r3 1824 * child_stack already in r4 1825 * ptidptr already in r5 1826 * newtls already in r6 1827 * ctidptr already in r7 1828 */ 1829 "sc\n\t" 1830 1831 /* Test if syscall was successful */ 1832 "cmpwi cr1, 3, 0\n\t" 1833 "crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t" 1834 "bne- cr1, 1f\n\t" 1835 1836 /* Do the function call */ 1837 "mtctr 28\n\t" 1838 "mr 3, 27\n\t" 1839 "bctrl\n\t" 1840 1841 /* Call _exit(r3) */ 1842 "li 0, %5\n\t" 1843 "sc\n\t" 1844 1845 /* Return to parent */ 1846 "1:\n" 1847 "mfcr %1\n\t" 1848 "mr %0, 3\n\t" 1849 : "=r" (__ret), "=r" (__err) 1850 : "0" (-1), "1" (EINVAL), 1851 "i" (__NR_clone), "i" (__NR_exit), 1852 "r" (__fn), "r" (__cstack), "r" (__flags), 1853 "r" (__arg), "r" (__ptidptr), "r" (__newtls), 1854 "r" (__ctidptr) 1855 : "cr0", "cr1", "memory", "ctr", 1856 "r0", "r29", "r27", "r28"); 1857 } 1858 LSS_RETURN(int, __ret, __err); 1859 } 1860 #endif 1861 #define __NR__exit __NR_exit 1862 #define __NR__gettid __NR_gettid 1863 #define __NR__mremap __NR_mremap 1864 LSS_INLINE _syscall1(int, close, int, f) 1865 LSS_INLINE _syscall1(int, _exit, int, e) 1866 LSS_INLINE _syscall3(int, fcntl, int, f, 1867 int, c, long, a) 1868 LSS_INLINE _syscall2(int, fstat, int, f, 1869 struct kernel_stat*, b) 1870 LSS_INLINE _syscall4(int, futex, int*, a, 1871 int, o, int, v, 1872 struct kernel_timespec*, t) 1873 LSS_INLINE _syscall3(int, getdents, int, f, 1874 struct kernel_dirent*, d, int, c) 1875 #ifdef __NR_getdents64 1876 LSS_INLINE _syscall3(int, getdents64, int, f, 1877 struct kernel_dirent64*, d, int, c) 1878 #endif 1879 LSS_INLINE _syscall0(pid_t, getpid) 1880 LSS_INLINE _syscall0(pid_t, getppid) 1881 LSS_INLINE _syscall0(pid_t, _gettid) 1882 LSS_INLINE _syscall2(int, kill, pid_t, p, 1883 int, s) 1884 #if defined(__x86_64__) 1885 /* Need to make sure off_t isn't truncated to 32-bits under x32. */ 1886 LSS_INLINE off_t LSS_NAME(lseek)(int f, off_t o, int w) { 1887 _LSS_BODY(3, off_t, lseek, off_t, LSS_SYSCALL_ARG(f), (uint64_t)(o), 1888 LSS_SYSCALL_ARG(w)); 1889 } 1890 #else 1891 LSS_INLINE _syscall3(off_t, lseek, int, f, 1892 off_t, o, int, w) 1893 #endif 1894 LSS_INLINE _syscall2(int, munmap, void*, s, 1895 size_t, l) 1896 LSS_INLINE _syscall5(void*, _mremap, void*, o, 1897 size_t, os, size_t, ns, 1898 unsigned long, f, void *, a) 1899 LSS_INLINE _syscall3(int, open, const char*, p, 1900 int, f, int, m) 1901 LSS_INLINE _syscall2(int, prctl, int, o, 1902 long, a) 1903 LSS_INLINE _syscall4(long, ptrace, int, r, 1904 pid_t, p, void *, a, void *, d) 1905 LSS_INLINE _syscall3(ssize_t, read, int, f, 1906 void *, b, size_t, c) 1907 LSS_INLINE _syscall4(int, rt_sigaction, int, s, 1908 const struct kernel_sigaction*, a, 1909 struct kernel_sigaction*, o, size_t, c) 1910 LSS_INLINE _syscall4(int, rt_sigprocmask, int, h, 1911 const struct kernel_sigset_t*, s, 1912 struct kernel_sigset_t*, o, size_t, c); 1913 LSS_INLINE _syscall0(int, sched_yield) 1914 LSS_INLINE _syscall2(int, sigaltstack, const stack_t*, s, 1915 const stack_t*, o) 1916 LSS_INLINE _syscall2(int, stat, const char*, f, 1917 struct kernel_stat*, b) 1918 LSS_INLINE _syscall3(ssize_t, write, int, f, 1919 const void *, b, size_t, c) 1920 #if defined(__NR_getcpu) 1921 LSS_INLINE _syscall3(long, getcpu, unsigned *, cpu, 1922 unsigned *, node, void *, unused); 1923 #endif 1924 #if defined(__x86_64__) || \ 1925 (defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI32) 1926 LSS_INLINE _syscall3(int, socket, int, d, 1927 int, t, int, p) 1928 #endif 1929 #if defined(__x86_64__) 1930 /* Need to make sure __off64_t isn't truncated to 32-bits under x32. */ 1931 LSS_INLINE void* LSS_NAME(mmap)(void *s, size_t l, int p, int f, int d, 1932 __off64_t o) { 1933 LSS_BODY(6, void*, mmap, LSS_SYSCALL_ARG(s), LSS_SYSCALL_ARG(l), 1934 LSS_SYSCALL_ARG(p), LSS_SYSCALL_ARG(f), 1935 LSS_SYSCALL_ARG(d), (uint64_t)(o)); 1936 } 1937 1938 LSS_INLINE int LSS_NAME(sigaction)(int signum, 1939 const struct kernel_sigaction *act, 1940 struct kernel_sigaction *oldact) { 1941 /* On x86_64, the kernel requires us to always set our own 1942 * SA_RESTORER in order to be able to return from a signal handler. 1943 * This function must have a "magic" signature that the "gdb" 1944 * (and maybe the kernel?) can recognize. 1945 */ 1946 if (act != NULL && !(act->sa_flags & SA_RESTORER)) { 1947 struct kernel_sigaction a = *act; 1948 a.sa_flags |= SA_RESTORER; 1949 a.sa_restorer = LSS_NAME(restore_rt)(); 1950 return LSS_NAME(rt_sigaction)(signum, &a, oldact, 1951 (KERNEL_NSIG+7)/8); 1952 } else { 1953 return LSS_NAME(rt_sigaction)(signum, act, oldact, 1954 (KERNEL_NSIG+7)/8); 1955 } 1956 } 1957 1958 LSS_INLINE int LSS_NAME(sigprocmask)(int how, 1959 const struct kernel_sigset_t *set, 1960 struct kernel_sigset_t *oldset) { 1961 return LSS_NAME(rt_sigprocmask)(how, set, oldset, (KERNEL_NSIG+7)/8); 1962 } 1963 #endif 1964 #if defined(__x86_64__) || \ 1965 defined(__arm__) || \ 1966 (defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI32) 1967 LSS_INLINE _syscall4(pid_t, wait4, pid_t, p, 1968 int*, s, int, o, 1969 struct kernel_rusage*, r) 1970 LSS_INLINE pid_t LSS_NAME(waitpid)(pid_t pid, int *status, int options){ 1971 return LSS_NAME(wait4)(pid, status, options, 0); 1972 } 1973 #endif 1974 #if (defined(__i386__) || defined(__x86_64__) || defined(__arm__)) && \ 1975 !defined(__ANDROID__) 1976 LSS_INLINE _syscall4(int, openat, int, d, const char *, p, int, f, int, m) 1977 #endif 1978 LSS_INLINE int LSS_NAME(sigemptyset)(struct kernel_sigset_t *set) { 1979 memset(&set->sig, 0, sizeof(set->sig)); 1980 return 0; 1981 } 1982 1983 LSS_INLINE int LSS_NAME(sigfillset)(struct kernel_sigset_t *set) { 1984 memset(&set->sig, -1, sizeof(set->sig)); 1985 return 0; 1986 } 1987 1988 LSS_INLINE int LSS_NAME(sigaddset)(struct kernel_sigset_t *set, 1989 int signum) { 1990 if (signum < 1 || signum > (int)(8*sizeof(set->sig))) { 1991 LSS_ERRNO = EINVAL; 1992 return -1; 1993 } else { 1994 set->sig[(signum - 1)/(8*sizeof(set->sig[0]))] 1995 |= 1UL << ((signum - 1) % (8*sizeof(set->sig[0]))); 1996 return 0; 1997 } 1998 } 1999 2000 LSS_INLINE int LSS_NAME(sigdelset)(struct kernel_sigset_t *set, 2001 int signum) { 2002 if (signum < 1 || signum > (int)(8*sizeof(set->sig))) { 2003 LSS_ERRNO = EINVAL; 2004 return -1; 2005 } else { 2006 set->sig[(signum - 1)/(8*sizeof(set->sig[0]))] 2007 &= ~(1UL << ((signum - 1) % (8*sizeof(set->sig[0])))); 2008 return 0; 2009 } 2010 } 2011 2012 #if defined(__i386__) || \ 2013 defined(__arm__) || \ 2014 (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) || defined(__PPC__) 2015 #define __NR__sigaction __NR_sigaction 2016 #define __NR__sigprocmask __NR_sigprocmask 2017 LSS_INLINE _syscall2(int, fstat64, int, f, 2018 struct kernel_stat64 *, b) 2019 LSS_INLINE _syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo, 2020 loff_t *, res, uint, wh) 2021 #ifdef __PPC64__ 2022 LSS_INLINE _syscall6(void*, mmap, void*, s, 2023 size_t, l, int, p, 2024 int, f, int, d, 2025 off_t, o) 2026 #else 2027 #ifndef __ARM_EABI__ 2028 /* Not available on ARM EABI Linux. */ 2029 LSS_INLINE _syscall1(void*, mmap, void*, a) 2030 #endif 2031 LSS_INLINE _syscall6(void*, mmap2, void*, s, 2032 size_t, l, int, p, 2033 int, f, int, d, 2034 off_t, o) 2035 #endif 2036 LSS_INLINE _syscall3(int, _sigaction, int, s, 2037 const struct kernel_old_sigaction*, a, 2038 struct kernel_old_sigaction*, o) 2039 LSS_INLINE _syscall3(int, _sigprocmask, int, h, 2040 const unsigned long*, s, 2041 unsigned long*, o) 2042 LSS_INLINE _syscall2(int, stat64, const char *, p, 2043 struct kernel_stat64 *, b) 2044 2045 LSS_INLINE int LSS_NAME(sigaction)(int signum, 2046 const struct kernel_sigaction *act, 2047 struct kernel_sigaction *oldact) { 2048 int old_errno = LSS_ERRNO; 2049 int rc; 2050 struct kernel_sigaction a; 2051 if (act != NULL) { 2052 a = *act; 2053 #ifdef __i386__ 2054 /* On i386, the kernel requires us to always set our own 2055 * SA_RESTORER when using realtime signals. Otherwise, it does not 2056 * know how to return from a signal handler. This function must have 2057 * a "magic" signature that the "gdb" (and maybe the kernel?) can 2058 * recognize. 2059 * Apparently, a SA_RESTORER is implicitly set by the kernel, when 2060 * using non-realtime signals. 2061 * 2062 * TODO: Test whether ARM needs a restorer 2063 */ 2064 if (!(a.sa_flags & SA_RESTORER)) { 2065 a.sa_flags |= SA_RESTORER; 2066 a.sa_restorer = (a.sa_flags & SA_SIGINFO) 2067 ? LSS_NAME(restore_rt)() : LSS_NAME(restore)(); 2068 } 2069 #endif 2070 } 2071 rc = LSS_NAME(rt_sigaction)(signum, act ? &a : act, oldact, 2072 (KERNEL_NSIG+7)/8); 2073 if (rc < 0 && LSS_ERRNO == ENOSYS) { 2074 struct kernel_old_sigaction oa, ooa, *ptr_a = &oa, *ptr_oa = &ooa; 2075 if (!act) { 2076 ptr_a = NULL; 2077 } else { 2078 oa.sa_handler_ = act->sa_handler_; 2079 memcpy(&oa.sa_mask, &act->sa_mask, sizeof(oa.sa_mask)); 2080 #ifndef __mips__ 2081 oa.sa_restorer = act->sa_restorer; 2082 #endif 2083 oa.sa_flags = act->sa_flags; 2084 } 2085 if (!oldact) { 2086 ptr_oa = NULL; 2087 } 2088 LSS_ERRNO = old_errno; 2089 rc = LSS_NAME(_sigaction)(signum, ptr_a, ptr_oa); 2090 if (rc == 0 && oldact) { 2091 if (act) { 2092 memcpy(oldact, act, sizeof(*act)); 2093 } else { 2094 memset(oldact, 0, sizeof(*oldact)); 2095 } 2096 oldact->sa_handler_ = ptr_oa->sa_handler_; 2097 oldact->sa_flags = ptr_oa->sa_flags; 2098 memcpy(&oldact->sa_mask, &ptr_oa->sa_mask, sizeof(ptr_oa->sa_mask)); 2099 #ifndef __mips__ 2100 oldact->sa_restorer = ptr_oa->sa_restorer; 2101 #endif 2102 } 2103 } 2104 return rc; 2105 } 2106 2107 LSS_INLINE int LSS_NAME(sigprocmask)(int how, 2108 const struct kernel_sigset_t *set, 2109 struct kernel_sigset_t *oldset) { 2110 int olderrno = LSS_ERRNO; 2111 int rc = LSS_NAME(rt_sigprocmask)(how, set, oldset, (KERNEL_NSIG+7)/8); 2112 if (rc < 0 && LSS_ERRNO == ENOSYS) { 2113 LSS_ERRNO = olderrno; 2114 if (oldset) { 2115 LSS_NAME(sigemptyset)(oldset); 2116 } 2117 rc = LSS_NAME(_sigprocmask)(how, 2118 set ? &set->sig[0] : NULL, 2119 oldset ? &oldset->sig[0] : NULL); 2120 } 2121 return rc; 2122 } 2123 #endif 2124 #if defined(__PPC__) 2125 #undef LSS_SC_LOADARGS_0 2126 #define LSS_SC_LOADARGS_0(dummy...) 2127 #undef LSS_SC_LOADARGS_1 2128 #define LSS_SC_LOADARGS_1(arg1) \ 2129 __sc_4 = (unsigned long) (arg1) 2130 #undef LSS_SC_LOADARGS_2 2131 #define LSS_SC_LOADARGS_2(arg1, arg2) \ 2132 LSS_SC_LOADARGS_1(arg1); \ 2133 __sc_5 = (unsigned long) (arg2) 2134 #undef LSS_SC_LOADARGS_3 2135 #define LSS_SC_LOADARGS_3(arg1, arg2, arg3) \ 2136 LSS_SC_LOADARGS_2(arg1, arg2); \ 2137 __sc_6 = (unsigned long) (arg3) 2138 #undef LSS_SC_LOADARGS_4 2139 #define LSS_SC_LOADARGS_4(arg1, arg2, arg3, arg4) \ 2140 LSS_SC_LOADARGS_3(arg1, arg2, arg3); \ 2141 __sc_7 = (unsigned long) (arg4) 2142 #undef LSS_SC_LOADARGS_5 2143 #define LSS_SC_LOADARGS_5(arg1, arg2, arg3, arg4, arg5) \ 2144 LSS_SC_LOADARGS_4(arg1, arg2, arg3, arg4); \ 2145 __sc_8 = (unsigned long) (arg5) 2146 #undef LSS_SC_BODY 2147 #define LSS_SC_BODY(nr, type, opt, args...) \ 2148 long __sc_ret, __sc_err; \ 2149 { \ 2150 register unsigned long __sc_0 __asm__ ("r0") = __NR_socketcall; \ 2151 register unsigned long __sc_3 __asm__ ("r3") = opt; \ 2152 register unsigned long __sc_4 __asm__ ("r4"); \ 2153 register unsigned long __sc_5 __asm__ ("r5"); \ 2154 register unsigned long __sc_6 __asm__ ("r6"); \ 2155 register unsigned long __sc_7 __asm__ ("r7"); \ 2156 register unsigned long __sc_8 __asm__ ("r8"); \ 2157 LSS_SC_LOADARGS_##nr(args); \ 2158 __asm__ __volatile__ \ 2159 ("stwu 1, -48(1)\n\t" \ 2160 "stw 4, 20(1)\n\t" \ 2161 "stw 5, 24(1)\n\t" \ 2162 "stw 6, 28(1)\n\t" \ 2163 "stw 7, 32(1)\n\t" \ 2164 "stw 8, 36(1)\n\t" \ 2165 "addi 4, 1, 20\n\t" \ 2166 "sc\n\t" \ 2167 "mfcr %0" \ 2168 : "=&r" (__sc_0), \ 2169 "=&r" (__sc_3), "=&r" (__sc_4), \ 2170 "=&r" (__sc_5), "=&r" (__sc_6), \ 2171 "=&r" (__sc_7), "=&r" (__sc_8) \ 2172 : LSS_ASMINPUT_##nr \ 2173 : "cr0", "ctr", "memory"); \ 2174 __sc_ret = __sc_3; \ 2175 __sc_err = __sc_0; \ 2176 } \ 2177 LSS_RETURN(type, __sc_ret, __sc_err) 2178 2179 LSS_INLINE int LSS_NAME(socket)(int domain, int type, int protocol) { 2180 LSS_SC_BODY(3, int, 1, domain, type, protocol); 2181 } 2182 #endif 2183 #if defined(__i386__) || \ 2184 (defined(__arm__) && !defined(__ARM_EABI__)) || \ 2185 (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) 2186 2187 /* See sys_socketcall in net/socket.c in kernel source. 2188 * It de-multiplexes on its first arg and unpacks the arglist 2189 * array in its second arg. 2190 */ 2191 LSS_INLINE _syscall2(long, socketcall, int, c, unsigned long*, a) 2192 2193 LSS_INLINE int LSS_NAME(socket)(int domain, int type, int protocol) { 2194 unsigned long args[3] = { 2195 (unsigned long) domain, 2196 (unsigned long) type, 2197 (unsigned long) protocol 2198 }; 2199 return LSS_NAME(socketcall)(1, args); 2200 } 2201 #elif defined(__ARM_EABI__) 2202 LSS_INLINE _syscall3(int, socket, int, d, 2203 int, t, int, p) 2204 #endif 2205 #if defined(__i386__) || defined(__PPC__) || \ 2206 (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) 2207 LSS_INLINE _syscall3(pid_t, waitpid, pid_t, p, 2208 int*, s, int, o) 2209 #endif 2210 #if defined(__mips__) 2211 /* sys_pipe() on MIPS has non-standard calling conventions, as it returns 2212 * both file handles through CPU registers. 2213 */ 2214 LSS_INLINE int LSS_NAME(pipe)(int *p) { 2215 register unsigned long __v0 __asm__("$2") = __NR_pipe; 2216 register unsigned long __v1 __asm__("$3"); 2217 register unsigned long __r7 __asm__("$7"); 2218 __asm__ __volatile__ ("syscall\n" 2219 : "=&r"(__v0), "=&r"(__v1), "+r" (__r7) 2220 : "0"(__v0) 2221 : "$8", "$9", "$10", "$11", "$12", 2222 "$13", "$14", "$15", "$24", "memory"); 2223 if (__r7) { 2224 LSS_ERRNO = __v0; 2225 return -1; 2226 } else { 2227 p[0] = __v0; 2228 p[1] = __v1; 2229 return 0; 2230 } 2231 } 2232 #else 2233 LSS_INLINE _syscall1(int, pipe, int *, p) 2234 #endif 2235 2236 LSS_INLINE pid_t LSS_NAME(gettid)() { 2237 pid_t tid = LSS_NAME(_gettid)(); 2238 if (tid != -1) { 2239 return tid; 2240 } 2241 return LSS_NAME(getpid)(); 2242 } 2243 2244 LSS_INLINE void *LSS_NAME(mremap)(void *old_address, size_t old_size, 2245 size_t new_size, int flags, ...) { 2246 va_list ap; 2247 void *new_address, *rc; 2248 va_start(ap, flags); 2249 new_address = va_arg(ap, void *); 2250 rc = LSS_NAME(_mremap)(old_address, old_size, new_size, 2251 flags, new_address); 2252 va_end(ap); 2253 return rc; 2254 } 2255 2256 LSS_INLINE int LSS_NAME(ptrace_detach)(pid_t pid) { 2257 /* PTRACE_DETACH can sometimes forget to wake up the tracee and it 2258 * then sends job control signals to the real parent, rather than to 2259 * the tracer. We reduce the risk of this happening by starting a 2260 * whole new time slice, and then quickly sending a SIGCONT signal 2261 * right after detaching from the tracee. 2262 */ 2263 int rc, err; 2264 LSS_NAME(sched_yield)(); 2265 rc = LSS_NAME(ptrace)(PTRACE_DETACH, pid, (void *)0, (void *)0); 2266 err = LSS_ERRNO; 2267 LSS_NAME(kill)(pid, SIGCONT); 2268 LSS_ERRNO = err; 2269 return rc; 2270 } 2271 #endif 2272 2273 #if defined(__cplusplus) && !defined(SYS_CPLUSPLUS) 2274 } 2275 #endif 2276 2277 #endif 2278 #endif 2279
