1 /* linux/arch/sparc64/kernel/sys_sparc.c 2 * 3 * This file contains various random system calls that 4 * have a non-standard calling sequence on the Linux/sparc 5 * platform. 6 */ 7 8 #include <linux/errno.h> 9 #include <linux/types.h> 10 #include <linux/sched/signal.h> 11 #include <linux/sched/mm.h> 12 #include <linux/sched/debug.h> 13 #include <linux/fs.h> 14 #include <linux/file.h> 15 #include <linux/mm.h> 16 #include <linux/sem.h> 17 #include <linux/msg.h> 18 #include <linux/shm.h> 19 #include <linux/stat.h> 20 #include <linux/mman.h> 21 #include <linux/utsname.h> 22 #include <linux/smp.h> 23 #include <linux/slab.h> 24 #include <linux/syscalls.h> 25 #include <linux/ipc.h> 26 #include <linux/personality.h> 27 #include <linux/random.h> 28 #include <linux/export.h> 29 #include <linux/context_tracking.h> 30 31 #include <linux/uaccess.h> 32 #include <asm/utrap.h> 33 #include <asm/unistd.h> 34 35 #include "entry.h" 36 #include "kernel.h" 37 #include "systbls.h" 38 39 /* #define DEBUG_UNIMP_SYSCALL */ 40 41 asmlinkage unsigned long sys_getpagesize(void) 42 { 43 return PAGE_SIZE; 44 } 45 46 /* Does addr --> addr+len fall within 4GB of the VA-space hole or 47 * overflow past the end of the 64-bit address space? 48 */ 49 static inline int invalid_64bit_range(unsigned long addr, unsigned long len) 50 { 51 unsigned long va_exclude_start, va_exclude_end; 52 53 va_exclude_start = VA_EXCLUDE_START; 54 va_exclude_end = VA_EXCLUDE_END; 55 56 if (unlikely(len >= va_exclude_start)) 57 return 1; 58 59 if (unlikely((addr + len) < addr)) 60 return 1; 61 62 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || 63 ((addr + len) >= va_exclude_start && 64 (addr + len) < va_exclude_end))) 65 return 1; 66 67 return 0; 68 } 69 70 /* These functions differ from the default implementations in 71 * mm/mmap.c in two ways: 72 * 73 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align, 74 * for fixed such mappings we just validate what the user gave us. 75 * 2) For 64-bit tasks we avoid mapping anything within 4GB of 76 * the spitfire/niagara VA-hole. 77 */ 78 79 static inline unsigned long COLOR_ALIGN(unsigned long addr, 80 unsigned long pgoff) 81 { 82 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); 83 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); 84 85 return base + off; 86 } 87 88 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 89 { 90 struct mm_struct *mm = current->mm; 91 struct vm_area_struct * vma; 92 unsigned long task_size = TASK_SIZE; 93 int do_color_align; 94 struct vm_unmapped_area_info info; 95 96 if (flags & MAP_FIXED) { 97 /* We do not accept a shared mapping if it would violate 98 * cache aliasing constraints. 99 */ 100 if ((flags & MAP_SHARED) && 101 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 102 return -EINVAL; 103 return addr; 104 } 105 106 if (test_thread_flag(TIF_32BIT)) 107 task_size = STACK_TOP32; 108 if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) 109 return -ENOMEM; 110 111 do_color_align = 0; 112 if (filp || (flags & MAP_SHARED)) 113 do_color_align = 1; 114 115 if (addr) { 116 if (do_color_align) 117 addr = COLOR_ALIGN(addr, pgoff); 118 else 119 addr = PAGE_ALIGN(addr); 120 121 vma = find_vma(mm, addr); 122 if (task_size - len >= addr && 123 (!vma || addr + len <= vma->vm_start)) 124 return addr; 125 } 126 127 info.flags = 0; 128 info.length = len; 129 info.low_limit = TASK_UNMAPPED_BASE; 130 info.high_limit = min(task_size, VA_EXCLUDE_START); 131 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 132 info.align_offset = pgoff << PAGE_SHIFT; 133 addr = vm_unmapped_area(&info); 134 135 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { 136 VM_BUG_ON(addr != -ENOMEM); 137 info.low_limit = VA_EXCLUDE_END; 138 info.high_limit = task_size; 139 addr = vm_unmapped_area(&info); 140 } 141 142 return addr; 143 } 144 145 unsigned long 146 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 147 const unsigned long len, const unsigned long pgoff, 148 const unsigned long flags) 149 { 150 struct vm_area_struct *vma; 151 struct mm_struct *mm = current->mm; 152 unsigned long task_size = STACK_TOP32; 153 unsigned long addr = addr0; 154 int do_color_align; 155 struct vm_unmapped_area_info info; 156 157 /* This should only ever run for 32-bit processes. */ 158 BUG_ON(!test_thread_flag(TIF_32BIT)); 159 160 if (flags & MAP_FIXED) { 161 /* We do not accept a shared mapping if it would violate 162 * cache aliasing constraints. 163 */ 164 if ((flags & MAP_SHARED) && 165 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 166 return -EINVAL; 167 return addr; 168 } 169 170 if (unlikely(len > task_size)) 171 return -ENOMEM; 172 173 do_color_align = 0; 174 if (filp || (flags & MAP_SHARED)) 175 do_color_align = 1; 176 177 /* requesting a specific address */ 178 if (addr) { 179 if (do_color_align) 180 addr = COLOR_ALIGN(addr, pgoff); 181 else 182 addr = PAGE_ALIGN(addr); 183 184 vma = find_vma(mm, addr); 185 if (task_size - len >= addr && 186 (!vma || addr + len <= vma->vm_start)) 187 return addr; 188 } 189 190 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 191 info.length = len; 192 info.low_limit = PAGE_SIZE; 193 info.high_limit = mm->mmap_base; 194 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 195 info.align_offset = pgoff << PAGE_SHIFT; 196 addr = vm_unmapped_area(&info); 197 198 /* 199 * A failed mmap() very likely causes application failure, 200 * so fall back to the bottom-up function here. This scenario 201 * can happen with large stack limits and large mmap() 202 * allocations. 203 */ 204 if (addr & ~PAGE_MASK) { 205 VM_BUG_ON(addr != -ENOMEM); 206 info.flags = 0; 207 info.low_limit = TASK_UNMAPPED_BASE; 208 info.high_limit = STACK_TOP32; 209 addr = vm_unmapped_area(&info); 210 } 211 212 return addr; 213 } 214 215 /* Try to align mapping such that we align it as much as possible. */ 216 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) 217 { 218 unsigned long align_goal, addr = -ENOMEM; 219 unsigned long (*get_area)(struct file *, unsigned long, 220 unsigned long, unsigned long, unsigned long); 221 222 get_area = current->mm->get_unmapped_area; 223 224 if (flags & MAP_FIXED) { 225 /* Ok, don't mess with it. */ 226 return get_area(NULL, orig_addr, len, pgoff, flags); 227 } 228 flags &= ~MAP_SHARED; 229 230 align_goal = PAGE_SIZE; 231 if (len >= (4UL * 1024 * 1024)) 232 align_goal = (4UL * 1024 * 1024); 233 else if (len >= (512UL * 1024)) 234 align_goal = (512UL * 1024); 235 else if (len >= (64UL * 1024)) 236 align_goal = (64UL * 1024); 237 238 do { 239 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); 240 if (!(addr & ~PAGE_MASK)) { 241 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); 242 break; 243 } 244 245 if (align_goal == (4UL * 1024 * 1024)) 246 align_goal = (512UL * 1024); 247 else if (align_goal == (512UL * 1024)) 248 align_goal = (64UL * 1024); 249 else 250 align_goal = PAGE_SIZE; 251 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); 252 253 /* Mapping is smaller than 64K or larger areas could not 254 * be obtained. 255 */ 256 if (addr & ~PAGE_MASK) 257 addr = get_area(NULL, orig_addr, len, pgoff, flags); 258 259 return addr; 260 } 261 EXPORT_SYMBOL(get_fb_unmapped_area); 262 263 /* Essentially the same as PowerPC. */ 264 static unsigned long mmap_rnd(void) 265 { 266 unsigned long rnd = 0UL; 267 268 if (current->flags & PF_RANDOMIZE) { 269 unsigned long val = get_random_long(); 270 if (test_thread_flag(TIF_32BIT)) 271 rnd = (val % (1UL << (23UL-PAGE_SHIFT))); 272 else 273 rnd = (val % (1UL << (30UL-PAGE_SHIFT))); 274 } 275 return rnd << PAGE_SHIFT; 276 } 277 278 void arch_pick_mmap_layout(struct mm_struct *mm) 279 { 280 unsigned long random_factor = mmap_rnd(); 281 unsigned long gap; 282 283 /* 284 * Fall back to the standard layout if the personality 285 * bit is set, or if the expected stack growth is unlimited: 286 */ 287 gap = rlimit(RLIMIT_STACK); 288 if (!test_thread_flag(TIF_32BIT) || 289 (current->personality & ADDR_COMPAT_LAYOUT) || 290 gap == RLIM_INFINITY || 291 sysctl_legacy_va_layout) { 292 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; 293 mm->get_unmapped_area = arch_get_unmapped_area; 294 } else { 295 /* We know it's 32-bit */ 296 unsigned long task_size = STACK_TOP32; 297 298 if (gap < 128 * 1024 * 1024) 299 gap = 128 * 1024 * 1024; 300 if (gap > (task_size / 6 * 5)) 301 gap = (task_size / 6 * 5); 302 303 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor); 304 mm->get_unmapped_area = arch_get_unmapped_area_topdown; 305 } 306 } 307 308 /* 309 * sys_pipe() is the normal C calling standard for creating 310 * a pipe. It's not the way unix traditionally does this, though. 311 */ 312 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs) 313 { 314 int fd[2]; 315 int error; 316 317 error = do_pipe_flags(fd, 0); 318 if (error) 319 goto out; 320 regs->u_regs[UREG_I1] = fd[1]; 321 error = fd[0]; 322 out: 323 return error; 324 } 325 326 /* 327 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 328 * 329 * This is really horribly ugly. 330 */ 331 332 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, 333 unsigned long, third, void __user *, ptr, long, fifth) 334 { 335 long err; 336 337 /* No need for backward compatibility. We can start fresh... */ 338 if (call <= SEMTIMEDOP) { 339 switch (call) { 340 case SEMOP: 341 err = sys_semtimedop(first, ptr, 342 (unsigned int)second, NULL); 343 goto out; 344 case SEMTIMEDOP: 345 err = sys_semtimedop(first, ptr, (unsigned int)second, 346 (const struct timespec __user *) 347 (unsigned long) fifth); 348 goto out; 349 case SEMGET: 350 err = sys_semget(first, (int)second, (int)third); 351 goto out; 352 case SEMCTL: { 353 err = sys_semctl(first, second, 354 (int)third | IPC_64, 355 (unsigned long) ptr); 356 goto out; 357 } 358 default: 359 err = -ENOSYS; 360 goto out; 361 } 362 } 363 if (call <= MSGCTL) { 364 switch (call) { 365 case MSGSND: 366 err = sys_msgsnd(first, ptr, (size_t)second, 367 (int)third); 368 goto out; 369 case MSGRCV: 370 err = sys_msgrcv(first, ptr, (size_t)second, fifth, 371 (int)third); 372 goto out; 373 case MSGGET: 374 err = sys_msgget((key_t)first, (int)second); 375 goto out; 376 case MSGCTL: 377 err = sys_msgctl(first, (int)second | IPC_64, ptr); 378 goto out; 379 default: 380 err = -ENOSYS; 381 goto out; 382 } 383 } 384 if (call <= SHMCTL) { 385 switch (call) { 386 case SHMAT: { 387 ulong raddr; 388 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); 389 if (!err) { 390 if (put_user(raddr, 391 (ulong __user *) third)) 392 err = -EFAULT; 393 } 394 goto out; 395 } 396 case SHMDT: 397 err = sys_shmdt(ptr); 398 goto out; 399 case SHMGET: 400 err = sys_shmget(first, (size_t)second, (int)third); 401 goto out; 402 case SHMCTL: 403 err = sys_shmctl(first, (int)second | IPC_64, ptr); 404 goto out; 405 default: 406 err = -ENOSYS; 407 goto out; 408 } 409 } else { 410 err = -ENOSYS; 411 } 412 out: 413 return err; 414 } 415 416 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) 417 { 418 long ret; 419 420 if (personality(current->personality) == PER_LINUX32 && 421 personality(personality) == PER_LINUX) 422 personality |= PER_LINUX32; 423 ret = sys_personality(personality); 424 if (personality(ret) == PER_LINUX32) 425 ret &= ~PER_LINUX32; 426 427 return ret; 428 } 429 430 int sparc_mmap_check(unsigned long addr, unsigned long len) 431 { 432 if (test_thread_flag(TIF_32BIT)) { 433 if (len >= STACK_TOP32) 434 return -EINVAL; 435 436 if (addr > STACK_TOP32 - len) 437 return -EINVAL; 438 } else { 439 if (len >= VA_EXCLUDE_START) 440 return -EINVAL; 441 442 if (invalid_64bit_range(addr, len)) 443 return -EINVAL; 444 } 445 446 return 0; 447 } 448 449 /* Linux version of mmap */ 450 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 451 unsigned long, prot, unsigned long, flags, unsigned long, fd, 452 unsigned long, off) 453 { 454 unsigned long retval = -EINVAL; 455 456 if ((off + PAGE_ALIGN(len)) < off) 457 goto out; 458 if (off & ~PAGE_MASK) 459 goto out; 460 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 461 out: 462 return retval; 463 } 464 465 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) 466 { 467 if (invalid_64bit_range(addr, len)) 468 return -EINVAL; 469 470 return vm_munmap(addr, len); 471 } 472 473 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, 474 unsigned long, new_len, unsigned long, flags, 475 unsigned long, new_addr) 476 { 477 if (test_thread_flag(TIF_32BIT)) 478 return -EINVAL; 479 return sys_mremap(addr, old_len, new_len, flags, new_addr); 480 } 481 482 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 483 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs) 484 { 485 static int count; 486 487 /* Don't make the system unusable, if someone goes stuck */ 488 if (count++ > 5) 489 return -ENOSYS; 490 491 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); 492 #ifdef DEBUG_UNIMP_SYSCALL 493 show_regs (regs); 494 #endif 495 496 return -ENOSYS; 497 } 498 499 /* #define DEBUG_SPARC_BREAKPOINT */ 500 501 asmlinkage void sparc_breakpoint(struct pt_regs *regs) 502 { 503 enum ctx_state prev_state = exception_enter(); 504 siginfo_t info; 505 506 if (test_thread_flag(TIF_32BIT)) { 507 regs->tpc &= 0xffffffff; 508 regs->tnpc &= 0xffffffff; 509 } 510 #ifdef DEBUG_SPARC_BREAKPOINT 511 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); 512 #endif 513 info.si_signo = SIGTRAP; 514 info.si_errno = 0; 515 info.si_code = TRAP_BRKPT; 516 info.si_addr = (void __user *)regs->tpc; 517 info.si_trapno = 0; 518 force_sig_info(SIGTRAP, &info, current); 519 #ifdef DEBUG_SPARC_BREAKPOINT 520 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); 521 #endif 522 exception_exit(prev_state); 523 } 524 525 extern void check_pending(int signum); 526 527 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) 528 { 529 int nlen, err; 530 531 if (len < 0) 532 return -EINVAL; 533 534 down_read(&uts_sem); 535 536 nlen = strlen(utsname()->domainname) + 1; 537 err = -EINVAL; 538 if (nlen > len) 539 goto out; 540 541 err = -EFAULT; 542 if (!copy_to_user(name, utsname()->domainname, nlen)) 543 err = 0; 544 545 out: 546 up_read(&uts_sem); 547 return err; 548 } 549 550 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, 551 utrap_handler_t, new_p, utrap_handler_t, new_d, 552 utrap_handler_t __user *, old_p, 553 utrap_handler_t __user *, old_d) 554 { 555 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) 556 return -EINVAL; 557 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { 558 if (old_p) { 559 if (!current_thread_info()->utraps) { 560 if (put_user(NULL, old_p)) 561 return -EFAULT; 562 } else { 563 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 564 return -EFAULT; 565 } 566 } 567 if (old_d) { 568 if (put_user(NULL, old_d)) 569 return -EFAULT; 570 } 571 return 0; 572 } 573 if (!current_thread_info()->utraps) { 574 current_thread_info()->utraps = 575 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL); 576 if (!current_thread_info()->utraps) 577 return -ENOMEM; 578 current_thread_info()->utraps[0] = 1; 579 } else { 580 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && 581 current_thread_info()->utraps[0] > 1) { 582 unsigned long *p = current_thread_info()->utraps; 583 584 current_thread_info()->utraps = 585 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), 586 GFP_KERNEL); 587 if (!current_thread_info()->utraps) { 588 current_thread_info()->utraps = p; 589 return -ENOMEM; 590 } 591 p[0]--; 592 current_thread_info()->utraps[0] = 1; 593 memcpy(current_thread_info()->utraps+1, p+1, 594 UT_TRAP_INSTRUCTION_31*sizeof(long)); 595 } 596 } 597 if (old_p) { 598 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 599 return -EFAULT; 600 } 601 if (old_d) { 602 if (put_user(NULL, old_d)) 603 return -EFAULT; 604 } 605 current_thread_info()->utraps[type] = (long)new_p; 606 607 return 0; 608 } 609 610 asmlinkage long sparc_memory_ordering(unsigned long model, 611 struct pt_regs *regs) 612 { 613 if (model >= 3) 614 return -EINVAL; 615 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); 616 return 0; 617 } 618 619 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, 620 struct sigaction __user *, oact, void __user *, restorer, 621 size_t, sigsetsize) 622 { 623 struct k_sigaction new_ka, old_ka; 624 int ret; 625 626 /* XXX: Don't preclude handling different sized sigset_t's. */ 627 if (sigsetsize != sizeof(sigset_t)) 628 return -EINVAL; 629 630 if (act) { 631 new_ka.ka_restorer = restorer; 632 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 633 return -EFAULT; 634 } 635 636 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 637 638 if (!ret && oact) { 639 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 640 return -EFAULT; 641 } 642 643 return ret; 644 } 645 646 asmlinkage long sys_kern_features(void) 647 { 648 return KERN_FEATURE_MIXED_MODE_STACK; 649 } 650