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.h> 11 #include <linux/fs.h> 12 #include <linux/file.h> 13 #include <linux/mm.h> 14 #include <linux/sem.h> 15 #include <linux/msg.h> 16 #include <linux/shm.h> 17 #include <linux/stat.h> 18 #include <linux/mman.h> 19 #include <linux/utsname.h> 20 #include <linux/smp.h> 21 #include <linux/slab.h> 22 #include <linux/syscalls.h> 23 #include <linux/ipc.h> 24 #include <linux/personality.h> 25 #include <linux/random.h> 26 #include <linux/export.h> 27 28 #include <asm/uaccess.h> 29 #include <asm/utrap.h> 30 #include <asm/unistd.h> 31 32 #include "entry.h" 33 #include "systbls.h" 34 35 /* #define DEBUG_UNIMP_SYSCALL */ 36 37 asmlinkage unsigned long sys_getpagesize(void) 38 { 39 return PAGE_SIZE; 40 } 41 42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL)) 43 #define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL)) 44 45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or 46 * overflow past the end of the 64-bit address space? 47 */ 48 static inline int invalid_64bit_range(unsigned long addr, unsigned long len) 49 { 50 unsigned long va_exclude_start, va_exclude_end; 51 52 va_exclude_start = VA_EXCLUDE_START; 53 va_exclude_end = VA_EXCLUDE_END; 54 55 if (unlikely(len >= va_exclude_start)) 56 return 1; 57 58 if (unlikely((addr + len) < addr)) 59 return 1; 60 61 if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) || 62 ((addr + len) >= va_exclude_start && 63 (addr + len) < va_exclude_end))) 64 return 1; 65 66 return 0; 67 } 68 69 /* These functions differ from the default implementations in 70 * mm/mmap.c in two ways: 71 * 72 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align, 73 * for fixed such mappings we just validate what the user gave us. 74 * 2) For 64-bit tasks we avoid mapping anything within 4GB of 75 * the spitfire/niagara VA-hole. 76 */ 77 78 static inline unsigned long COLOR_ALIGN(unsigned long addr, 79 unsigned long pgoff) 80 { 81 unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1); 82 unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1); 83 84 return base + off; 85 } 86 87 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 88 { 89 struct mm_struct *mm = current->mm; 90 struct vm_area_struct * vma; 91 unsigned long task_size = TASK_SIZE; 92 int do_color_align; 93 struct vm_unmapped_area_info info; 94 95 if (flags & MAP_FIXED) { 96 /* We do not accept a shared mapping if it would violate 97 * cache aliasing constraints. 98 */ 99 if ((flags & MAP_SHARED) && 100 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 101 return -EINVAL; 102 return addr; 103 } 104 105 if (test_thread_flag(TIF_32BIT)) 106 task_size = STACK_TOP32; 107 if (unlikely(len > task_size || len >= VA_EXCLUDE_START)) 108 return -ENOMEM; 109 110 do_color_align = 0; 111 if (filp || (flags & MAP_SHARED)) 112 do_color_align = 1; 113 114 if (addr) { 115 if (do_color_align) 116 addr = COLOR_ALIGN(addr, pgoff); 117 else 118 addr = PAGE_ALIGN(addr); 119 120 vma = find_vma(mm, addr); 121 if (task_size - len >= addr && 122 (!vma || addr + len <= vma->vm_start)) 123 return addr; 124 } 125 126 info.flags = 0; 127 info.length = len; 128 info.low_limit = TASK_UNMAPPED_BASE; 129 info.high_limit = min(task_size, VA_EXCLUDE_START); 130 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 131 info.align_offset = pgoff << PAGE_SHIFT; 132 addr = vm_unmapped_area(&info); 133 134 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) { 135 VM_BUG_ON(addr != -ENOMEM); 136 info.low_limit = VA_EXCLUDE_END; 137 info.high_limit = task_size; 138 addr = vm_unmapped_area(&info); 139 } 140 141 return addr; 142 } 143 144 unsigned long 145 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, 146 const unsigned long len, const unsigned long pgoff, 147 const unsigned long flags) 148 { 149 struct vm_area_struct *vma; 150 struct mm_struct *mm = current->mm; 151 unsigned long task_size = STACK_TOP32; 152 unsigned long addr = addr0; 153 int do_color_align; 154 struct vm_unmapped_area_info info; 155 156 /* This should only ever run for 32-bit processes. */ 157 BUG_ON(!test_thread_flag(TIF_32BIT)); 158 159 if (flags & MAP_FIXED) { 160 /* We do not accept a shared mapping if it would violate 161 * cache aliasing constraints. 162 */ 163 if ((flags & MAP_SHARED) && 164 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 165 return -EINVAL; 166 return addr; 167 } 168 169 if (unlikely(len > task_size)) 170 return -ENOMEM; 171 172 do_color_align = 0; 173 if (filp || (flags & MAP_SHARED)) 174 do_color_align = 1; 175 176 /* requesting a specific address */ 177 if (addr) { 178 if (do_color_align) 179 addr = COLOR_ALIGN(addr, pgoff); 180 else 181 addr = PAGE_ALIGN(addr); 182 183 vma = find_vma(mm, addr); 184 if (task_size - len >= addr && 185 (!vma || addr + len <= vma->vm_start)) 186 return addr; 187 } 188 189 info.flags = VM_UNMAPPED_AREA_TOPDOWN; 190 info.length = len; 191 info.low_limit = PAGE_SIZE; 192 info.high_limit = mm->mmap_base; 193 info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; 194 info.align_offset = pgoff << PAGE_SHIFT; 195 addr = vm_unmapped_area(&info); 196 197 /* 198 * A failed mmap() very likely causes application failure, 199 * so fall back to the bottom-up function here. This scenario 200 * can happen with large stack limits and large mmap() 201 * allocations. 202 */ 203 if (addr & ~PAGE_MASK) { 204 VM_BUG_ON(addr != -ENOMEM); 205 info.flags = 0; 206 info.low_limit = TASK_UNMAPPED_BASE; 207 info.high_limit = STACK_TOP32; 208 addr = vm_unmapped_area(&info); 209 } 210 211 return addr; 212 } 213 214 /* Try to align mapping such that we align it as much as possible. */ 215 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags) 216 { 217 unsigned long align_goal, addr = -ENOMEM; 218 unsigned long (*get_area)(struct file *, unsigned long, 219 unsigned long, unsigned long, unsigned long); 220 221 get_area = current->mm->get_unmapped_area; 222 223 if (flags & MAP_FIXED) { 224 /* Ok, don't mess with it. */ 225 return get_area(NULL, orig_addr, len, pgoff, flags); 226 } 227 flags &= ~MAP_SHARED; 228 229 align_goal = PAGE_SIZE; 230 if (len >= (4UL * 1024 * 1024)) 231 align_goal = (4UL * 1024 * 1024); 232 else if (len >= (512UL * 1024)) 233 align_goal = (512UL * 1024); 234 else if (len >= (64UL * 1024)) 235 align_goal = (64UL * 1024); 236 237 do { 238 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags); 239 if (!(addr & ~PAGE_MASK)) { 240 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL); 241 break; 242 } 243 244 if (align_goal == (4UL * 1024 * 1024)) 245 align_goal = (512UL * 1024); 246 else if (align_goal == (512UL * 1024)) 247 align_goal = (64UL * 1024); 248 else 249 align_goal = PAGE_SIZE; 250 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE); 251 252 /* Mapping is smaller than 64K or larger areas could not 253 * be obtained. 254 */ 255 if (addr & ~PAGE_MASK) 256 addr = get_area(NULL, orig_addr, len, pgoff, flags); 257 258 return addr; 259 } 260 EXPORT_SYMBOL(get_fb_unmapped_area); 261 262 /* Essentially the same as PowerPC. */ 263 static unsigned long mmap_rnd(void) 264 { 265 unsigned long rnd = 0UL; 266 267 if (current->flags & PF_RANDOMIZE) { 268 unsigned long val = get_random_int(); 269 if (test_thread_flag(TIF_32BIT)) 270 rnd = (val % (1UL << (23UL-PAGE_SHIFT))); 271 else 272 rnd = (val % (1UL << (30UL-PAGE_SHIFT))); 273 } 274 return rnd << PAGE_SHIFT; 275 } 276 277 void arch_pick_mmap_layout(struct mm_struct *mm) 278 { 279 unsigned long random_factor = mmap_rnd(); 280 unsigned long gap; 281 282 /* 283 * Fall back to the standard layout if the personality 284 * bit is set, or if the expected stack growth is unlimited: 285 */ 286 gap = rlimit(RLIMIT_STACK); 287 if (!test_thread_flag(TIF_32BIT) || 288 (current->personality & ADDR_COMPAT_LAYOUT) || 289 gap == RLIM_INFINITY || 290 sysctl_legacy_va_layout) { 291 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor; 292 mm->get_unmapped_area = arch_get_unmapped_area; 293 mm->unmap_area = arch_unmap_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 mm->unmap_area = arch_unmap_area_topdown; 306 } 307 } 308 309 /* 310 * sys_pipe() is the normal C calling standard for creating 311 * a pipe. It's not the way unix traditionally does this, though. 312 */ 313 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs) 314 { 315 int fd[2]; 316 int error; 317 318 error = do_pipe_flags(fd, 0); 319 if (error) 320 goto out; 321 regs->u_regs[UREG_I1] = fd[1]; 322 error = fd[0]; 323 out: 324 return error; 325 } 326 327 /* 328 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 329 * 330 * This is really horribly ugly. 331 */ 332 333 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second, 334 unsigned long, third, void __user *, ptr, long, fifth) 335 { 336 long err; 337 338 /* No need for backward compatibility. We can start fresh... */ 339 if (call <= SEMCTL) { 340 switch (call) { 341 case SEMOP: 342 err = sys_semtimedop(first, ptr, 343 (unsigned)second, NULL); 344 goto out; 345 case SEMTIMEDOP: 346 err = sys_semtimedop(first, ptr, (unsigned)second, 347 (const struct timespec __user *) 348 (unsigned long) fifth); 349 goto out; 350 case SEMGET: 351 err = sys_semget(first, (int)second, (int)third); 352 goto out; 353 case SEMCTL: { 354 err = sys_semctl(first, second, 355 (int)third | IPC_64, 356 (union semun) ptr); 357 goto out; 358 } 359 default: 360 err = -ENOSYS; 361 goto out; 362 } 363 } 364 if (call <= MSGCTL) { 365 switch (call) { 366 case MSGSND: 367 err = sys_msgsnd(first, ptr, (size_t)second, 368 (int)third); 369 goto out; 370 case MSGRCV: 371 err = sys_msgrcv(first, ptr, (size_t)second, fifth, 372 (int)third); 373 goto out; 374 case MSGGET: 375 err = sys_msgget((key_t)first, (int)second); 376 goto out; 377 case MSGCTL: 378 err = sys_msgctl(first, (int)second | IPC_64, ptr); 379 goto out; 380 default: 381 err = -ENOSYS; 382 goto out; 383 } 384 } 385 if (call <= SHMCTL) { 386 switch (call) { 387 case SHMAT: { 388 ulong raddr; 389 err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA); 390 if (!err) { 391 if (put_user(raddr, 392 (ulong __user *) third)) 393 err = -EFAULT; 394 } 395 goto out; 396 } 397 case SHMDT: 398 err = sys_shmdt(ptr); 399 goto out; 400 case SHMGET: 401 err = sys_shmget(first, (size_t)second, (int)third); 402 goto out; 403 case SHMCTL: 404 err = sys_shmctl(first, (int)second | IPC_64, ptr); 405 goto out; 406 default: 407 err = -ENOSYS; 408 goto out; 409 } 410 } else { 411 err = -ENOSYS; 412 } 413 out: 414 return err; 415 } 416 417 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality) 418 { 419 int ret; 420 421 if (personality(current->personality) == PER_LINUX32 && 422 personality(personality) == PER_LINUX) 423 personality |= PER_LINUX32; 424 ret = sys_personality(personality); 425 if (personality(ret) == PER_LINUX32) 426 ret &= ~PER_LINUX32; 427 428 return ret; 429 } 430 431 int sparc_mmap_check(unsigned long addr, unsigned long len) 432 { 433 if (test_thread_flag(TIF_32BIT)) { 434 if (len >= STACK_TOP32) 435 return -EINVAL; 436 437 if (addr > STACK_TOP32 - len) 438 return -EINVAL; 439 } else { 440 if (len >= VA_EXCLUDE_START) 441 return -EINVAL; 442 443 if (invalid_64bit_range(addr, len)) 444 return -EINVAL; 445 } 446 447 return 0; 448 } 449 450 /* Linux version of mmap */ 451 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, 452 unsigned long, prot, unsigned long, flags, unsigned long, fd, 453 unsigned long, off) 454 { 455 unsigned long retval = -EINVAL; 456 457 if ((off + PAGE_ALIGN(len)) < off) 458 goto out; 459 if (off & ~PAGE_MASK) 460 goto out; 461 retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 462 out: 463 return retval; 464 } 465 466 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len) 467 { 468 if (invalid_64bit_range(addr, len)) 469 return -EINVAL; 470 471 return vm_munmap(addr, len); 472 } 473 474 extern unsigned long do_mremap(unsigned long addr, 475 unsigned long old_len, unsigned long new_len, 476 unsigned long flags, unsigned long new_addr); 477 478 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len, 479 unsigned long, new_len, unsigned long, flags, 480 unsigned long, new_addr) 481 { 482 if (test_thread_flag(TIF_32BIT)) 483 return -EINVAL; 484 return sys_mremap(addr, old_len, new_len, flags, new_addr); 485 } 486 487 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 488 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs) 489 { 490 static int count; 491 492 /* Don't make the system unusable, if someone goes stuck */ 493 if (count++ > 5) 494 return -ENOSYS; 495 496 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]); 497 #ifdef DEBUG_UNIMP_SYSCALL 498 show_regs (regs); 499 #endif 500 501 return -ENOSYS; 502 } 503 504 /* #define DEBUG_SPARC_BREAKPOINT */ 505 506 asmlinkage void sparc_breakpoint(struct pt_regs *regs) 507 { 508 siginfo_t info; 509 510 if (test_thread_flag(TIF_32BIT)) { 511 regs->tpc &= 0xffffffff; 512 regs->tnpc &= 0xffffffff; 513 } 514 #ifdef DEBUG_SPARC_BREAKPOINT 515 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc); 516 #endif 517 info.si_signo = SIGTRAP; 518 info.si_errno = 0; 519 info.si_code = TRAP_BRKPT; 520 info.si_addr = (void __user *)regs->tpc; 521 info.si_trapno = 0; 522 force_sig_info(SIGTRAP, &info, current); 523 #ifdef DEBUG_SPARC_BREAKPOINT 524 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc); 525 #endif 526 } 527 528 extern void check_pending(int signum); 529 530 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len) 531 { 532 int nlen, err; 533 534 if (len < 0) 535 return -EINVAL; 536 537 down_read(&uts_sem); 538 539 nlen = strlen(utsname()->domainname) + 1; 540 err = -EINVAL; 541 if (nlen > len) 542 goto out; 543 544 err = -EFAULT; 545 if (!copy_to_user(name, utsname()->domainname, nlen)) 546 err = 0; 547 548 out: 549 up_read(&uts_sem); 550 return err; 551 } 552 553 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type, 554 utrap_handler_t, new_p, utrap_handler_t, new_d, 555 utrap_handler_t __user *, old_p, 556 utrap_handler_t __user *, old_d) 557 { 558 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31) 559 return -EINVAL; 560 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) { 561 if (old_p) { 562 if (!current_thread_info()->utraps) { 563 if (put_user(NULL, old_p)) 564 return -EFAULT; 565 } else { 566 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 567 return -EFAULT; 568 } 569 } 570 if (old_d) { 571 if (put_user(NULL, old_d)) 572 return -EFAULT; 573 } 574 return 0; 575 } 576 if (!current_thread_info()->utraps) { 577 current_thread_info()->utraps = 578 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL); 579 if (!current_thread_info()->utraps) 580 return -ENOMEM; 581 current_thread_info()->utraps[0] = 1; 582 } else { 583 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p && 584 current_thread_info()->utraps[0] > 1) { 585 unsigned long *p = current_thread_info()->utraps; 586 587 current_thread_info()->utraps = 588 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), 589 GFP_KERNEL); 590 if (!current_thread_info()->utraps) { 591 current_thread_info()->utraps = p; 592 return -ENOMEM; 593 } 594 p[0]--; 595 current_thread_info()->utraps[0] = 1; 596 memcpy(current_thread_info()->utraps+1, p+1, 597 UT_TRAP_INSTRUCTION_31*sizeof(long)); 598 } 599 } 600 if (old_p) { 601 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p)) 602 return -EFAULT; 603 } 604 if (old_d) { 605 if (put_user(NULL, old_d)) 606 return -EFAULT; 607 } 608 current_thread_info()->utraps[type] = (long)new_p; 609 610 return 0; 611 } 612 613 asmlinkage long sparc_memory_ordering(unsigned long model, 614 struct pt_regs *regs) 615 { 616 if (model >= 3) 617 return -EINVAL; 618 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14); 619 return 0; 620 } 621 622 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act, 623 struct sigaction __user *, oact, void __user *, restorer, 624 size_t, sigsetsize) 625 { 626 struct k_sigaction new_ka, old_ka; 627 int ret; 628 629 /* XXX: Don't preclude handling different sized sigset_t's. */ 630 if (sigsetsize != sizeof(sigset_t)) 631 return -EINVAL; 632 633 if (act) { 634 new_ka.ka_restorer = restorer; 635 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 636 return -EFAULT; 637 } 638 639 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 640 641 if (!ret && oact) { 642 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 643 return -EFAULT; 644 } 645 646 return ret; 647 } 648 649 asmlinkage long sys_kern_features(void) 650 { 651 return KERN_FEATURE_MIXED_MODE_STACK; 652 } 653