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