1/* 2 * linux/arch/m68k/kernel/sys_m68k.c 3 * 4 * This file contains various random system calls that 5 * have a non-standard calling sequence on the Linux/m68k 6 * platform. 7 */ 8 9#include <linux/capability.h> 10#include <linux/errno.h> 11#include <linux/sched.h> 12#include <linux/mm.h> 13#include <linux/smp.h> 14#include <linux/smp_lock.h> 15#include <linux/sem.h> 16#include <linux/msg.h> 17#include <linux/shm.h> 18#include <linux/stat.h> 19#include <linux/syscalls.h> 20#include <linux/mman.h> 21#include <linux/file.h> 22#include <linux/utsname.h> 23 24#include <asm/setup.h> 25#include <asm/uaccess.h> 26#include <asm/cachectl.h> 27#include <asm/traps.h> 28#include <asm/ipc.h> 29#include <asm/page.h> 30#include <asm/unistd.h> 31 32/* 33 * sys_pipe() is the normal C calling standard for creating 34 * a pipe. It's not the way unix traditionally does this, though. 35 */ 36asmlinkage int sys_pipe(unsigned long __user * fildes) 37{ 38 int fd[2]; 39 int error; 40 41 error = do_pipe(fd); 42 if (!error) { 43 if (copy_to_user(fildes, fd, 2*sizeof(int))) 44 error = -EFAULT; 45 } 46 return error; 47} 48 49/* common code for old and new mmaps */ 50static inline long do_mmap2( 51 unsigned long addr, unsigned long len, 52 unsigned long prot, unsigned long flags, 53 unsigned long fd, unsigned long pgoff) 54{ 55 int error = -EBADF; 56 struct file * file = NULL; 57 58 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 59 if (!(flags & MAP_ANONYMOUS)) { 60 file = fget(fd); 61 if (!file) 62 goto out; 63 } 64 65 down_write(¤t->mm->mmap_sem); 66 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 67 up_write(¤t->mm->mmap_sem); 68 69 if (file) 70 fput(file); 71out: 72 return error; 73} 74 75asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, 76 unsigned long prot, unsigned long flags, 77 unsigned long fd, unsigned long pgoff) 78{ 79 return do_mmap2(addr, len, prot, flags, fd, pgoff); 80} 81 82/* 83 * Perform the select(nd, in, out, ex, tv) and mmap() system 84 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to 85 * handle more than 4 system call parameters, so these system calls 86 * used a memory block for parameter passing.. 87 */ 88 89struct mmap_arg_struct { 90 unsigned long addr; 91 unsigned long len; 92 unsigned long prot; 93 unsigned long flags; 94 unsigned long fd; 95 unsigned long offset; 96}; 97 98asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) 99{ 100 struct mmap_arg_struct a; 101 int error = -EFAULT; 102 103 if (copy_from_user(&a, arg, sizeof(a))) 104 goto out; 105 106 error = -EINVAL; 107 if (a.offset & ~PAGE_MASK) 108 goto out; 109 110 a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 111 112 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 113out: 114 return error; 115} 116 117 118struct sel_arg_struct { 119 unsigned long n; 120 fd_set __user *inp, *outp, *exp; 121 struct timeval __user *tvp; 122}; 123 124asmlinkage int old_select(struct sel_arg_struct __user *arg) 125{ 126 struct sel_arg_struct a; 127 128 if (copy_from_user(&a, arg, sizeof(a))) 129 return -EFAULT; 130 /* sys_select() does the appropriate kernel locking */ 131 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); 132} 133 134/* 135 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 136 * 137 * This is really horribly ugly. 138 */ 139asmlinkage int sys_ipc (uint call, int first, int second, 140 int third, void __user *ptr, long fifth) 141{ 142 int version, ret; 143 144 version = call >> 16; /* hack for backward compatibility */ 145 call &= 0xffff; 146 147 if (call <= SEMCTL) 148 switch (call) { 149 case SEMOP: 150 return sys_semop (first, ptr, second); 151 case SEMGET: 152 return sys_semget (first, second, third); 153 case SEMCTL: { 154 union semun fourth; 155 if (!ptr) 156 return -EINVAL; 157 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 158 return -EFAULT; 159 return sys_semctl (first, second, third, fourth); 160 } 161 default: 162 return -ENOSYS; 163 } 164 if (call <= MSGCTL) 165 switch (call) { 166 case MSGSND: 167 return sys_msgsnd (first, ptr, second, third); 168 case MSGRCV: 169 switch (version) { 170 case 0: { 171 struct ipc_kludge tmp; 172 if (!ptr) 173 return -EINVAL; 174 if (copy_from_user (&tmp, ptr, sizeof (tmp))) 175 return -EFAULT; 176 return sys_msgrcv (first, tmp.msgp, second, 177 tmp.msgtyp, third); 178 } 179 default: 180 return sys_msgrcv (first, ptr, 181 second, fifth, third); 182 } 183 case MSGGET: 184 return sys_msgget ((key_t) first, second); 185 case MSGCTL: 186 return sys_msgctl (first, second, ptr); 187 default: 188 return -ENOSYS; 189 } 190 if (call <= SHMCTL) 191 switch (call) { 192 case SHMAT: 193 switch (version) { 194 default: { 195 ulong raddr; 196 ret = do_shmat (first, ptr, second, &raddr); 197 if (ret) 198 return ret; 199 return put_user (raddr, (ulong __user *) third); 200 } 201 } 202 case SHMDT: 203 return sys_shmdt (ptr); 204 case SHMGET: 205 return sys_shmget (first, second, third); 206 case SHMCTL: 207 return sys_shmctl (first, second, ptr); 208 default: 209 return -ENOSYS; 210 } 211 212 return -EINVAL; 213} 214 215/* Convert virtual (user) address VADDR to physical address PADDR */ 216#define virt_to_phys_040(vaddr) \ 217({ \ 218 unsigned long _mmusr, _paddr; \ 219 \ 220 __asm__ __volatile__ (".chip 68040\n\t" \ 221 "ptestr (%1)\n\t" \ 222 "movec %%mmusr,%0\n\t" \ 223 ".chip 68k" \ 224 : "=r" (_mmusr) \ 225 : "a" (vaddr)); \ 226 _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0; \ 227 _paddr; \ 228}) 229 230static inline int 231cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len) 232{ 233 unsigned long paddr, i; 234 235 switch (scope) 236 { 237 case FLUSH_SCOPE_ALL: 238 switch (cache) 239 { 240 case FLUSH_CACHE_DATA: 241 /* This nop is needed for some broken versions of the 68040. */ 242 __asm__ __volatile__ ("nop\n\t" 243 ".chip 68040\n\t" 244 "cpusha %dc\n\t" 245 ".chip 68k"); 246 break; 247 case FLUSH_CACHE_INSN: 248 __asm__ __volatile__ ("nop\n\t" 249 ".chip 68040\n\t" 250 "cpusha %ic\n\t" 251 ".chip 68k"); 252 break; 253 default: 254 case FLUSH_CACHE_BOTH: 255 __asm__ __volatile__ ("nop\n\t" 256 ".chip 68040\n\t" 257 "cpusha %bc\n\t" 258 ".chip 68k"); 259 break; 260 } 261 break; 262 263 case FLUSH_SCOPE_LINE: 264 /* Find the physical address of the first mapped page in the 265 address range. */ 266 if ((paddr = virt_to_phys_040(addr))) { 267 paddr += addr & ~(PAGE_MASK | 15); 268 len = (len + (addr & 15) + 15) >> 4; 269 } else { 270 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK); 271 272 if (len <= tmp) 273 return 0; 274 addr += tmp; 275 len -= tmp; 276 tmp = PAGE_SIZE; 277 for (;;) 278 { 279 if ((paddr = virt_to_phys_040(addr))) 280 break; 281 if (len <= tmp) 282 return 0; 283 addr += tmp; 284 len -= tmp; 285 } 286 len = (len + 15) >> 4; 287 } 288 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4; 289 while (len--) 290 { 291 switch (cache) 292 { 293 case FLUSH_CACHE_DATA: 294 __asm__ __volatile__ ("nop\n\t" 295 ".chip 68040\n\t" 296 "cpushl %%dc,(%0)\n\t" 297 ".chip 68k" 298 : : "a" (paddr)); 299 break; 300 case FLUSH_CACHE_INSN: 301 __asm__ __volatile__ ("nop\n\t" 302 ".chip 68040\n\t" 303 "cpushl %%ic,(%0)\n\t" 304 ".chip 68k" 305 : : "a" (paddr)); 306 break; 307 default: 308 case FLUSH_CACHE_BOTH: 309 __asm__ __volatile__ ("nop\n\t" 310 ".chip 68040\n\t" 311 "cpushl %%bc,(%0)\n\t" 312 ".chip 68k" 313 : : "a" (paddr)); 314 break; 315 } 316 if (!--i && len) 317 { 318 /* 319 * No need to page align here since it is done by 320 * virt_to_phys_040(). 321 */ 322 addr += PAGE_SIZE; 323 i = PAGE_SIZE / 16; 324 /* Recompute physical address when crossing a page 325 boundary. */ 326 for (;;) 327 { 328 if ((paddr = virt_to_phys_040(addr))) 329 break; 330 if (len <= i) 331 return 0; 332 len -= i; 333 addr += PAGE_SIZE; 334 } 335 } 336 else 337 paddr += 16; 338 } 339 break; 340 341 default: 342 case FLUSH_SCOPE_PAGE: 343 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1); 344 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE) 345 { 346 if (!(paddr = virt_to_phys_040(addr))) 347 continue; 348 switch (cache) 349 { 350 case FLUSH_CACHE_DATA: 351 __asm__ __volatile__ ("nop\n\t" 352 ".chip 68040\n\t" 353 "cpushp %%dc,(%0)\n\t" 354 ".chip 68k" 355 : : "a" (paddr)); 356 break; 357 case FLUSH_CACHE_INSN: 358 __asm__ __volatile__ ("nop\n\t" 359 ".chip 68040\n\t" 360 "cpushp %%ic,(%0)\n\t" 361 ".chip 68k" 362 : : "a" (paddr)); 363 break; 364 default: 365 case FLUSH_CACHE_BOTH: 366 __asm__ __volatile__ ("nop\n\t" 367 ".chip 68040\n\t" 368 "cpushp %%bc,(%0)\n\t" 369 ".chip 68k" 370 : : "a" (paddr)); 371 break; 372 } 373 } 374 break; 375 } 376 return 0; 377} 378 379#define virt_to_phys_060(vaddr) \ 380({ \ 381 unsigned long paddr; \ 382 __asm__ __volatile__ (".chip 68060\n\t" \ 383 "plpar (%0)\n\t" \ 384 ".chip 68k" \ 385 : "=a" (paddr) \ 386 : "0" (vaddr)); \ 387 (paddr); \ 388}) 389 390static inline int 391cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len) 392{ 393 unsigned long paddr, i; 394 395 /* 396 * 68060 manual says: 397 * cpush %dc : flush DC, remains valid (with our %cacr setup) 398 * cpush %ic : invalidate IC 399 * cpush %bc : flush DC + invalidate IC 400 */ 401 switch (scope) 402 { 403 case FLUSH_SCOPE_ALL: 404 switch (cache) 405 { 406 case FLUSH_CACHE_DATA: 407 __asm__ __volatile__ (".chip 68060\n\t" 408 "cpusha %dc\n\t" 409 ".chip 68k"); 410 break; 411 case FLUSH_CACHE_INSN: 412 __asm__ __volatile__ (".chip 68060\n\t" 413 "cpusha %ic\n\t" 414 ".chip 68k"); 415 break; 416 default: 417 case FLUSH_CACHE_BOTH: 418 __asm__ __volatile__ (".chip 68060\n\t" 419 "cpusha %bc\n\t" 420 ".chip 68k"); 421 break; 422 } 423 break; 424 425 case FLUSH_SCOPE_LINE: 426 /* Find the physical address of the first mapped page in the 427 address range. */ 428 len += addr & 15; 429 addr &= -16; 430 if (!(paddr = virt_to_phys_060(addr))) { 431 unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK); 432 433 if (len <= tmp) 434 return 0; 435 addr += tmp; 436 len -= tmp; 437 tmp = PAGE_SIZE; 438 for (;;) 439 { 440 if ((paddr = virt_to_phys_060(addr))) 441 break; 442 if (len <= tmp) 443 return 0; 444 addr += tmp; 445 len -= tmp; 446 } 447 } 448 len = (len + 15) >> 4; 449 i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4; 450 while (len--) 451 { 452 switch (cache) 453 { 454 case FLUSH_CACHE_DATA: 455 __asm__ __volatile__ (".chip 68060\n\t" 456 "cpushl %%dc,(%0)\n\t" 457 ".chip 68k" 458 : : "a" (paddr)); 459 break; 460 case FLUSH_CACHE_INSN: 461 __asm__ __volatile__ (".chip 68060\n\t" 462 "cpushl %%ic,(%0)\n\t" 463 ".chip 68k" 464 : : "a" (paddr)); 465 break; 466 default: 467 case FLUSH_CACHE_BOTH: 468 __asm__ __volatile__ (".chip 68060\n\t" 469 "cpushl %%bc,(%0)\n\t" 470 ".chip 68k" 471 : : "a" (paddr)); 472 break; 473 } 474 if (!--i && len) 475 { 476 477 /* 478 * We just want to jump to the first cache line 479 * in the next page. 480 */ 481 addr += PAGE_SIZE; 482 addr &= PAGE_MASK; 483 484 i = PAGE_SIZE / 16; 485 /* Recompute physical address when crossing a page 486 boundary. */ 487 for (;;) 488 { 489 if ((paddr = virt_to_phys_060(addr))) 490 break; 491 if (len <= i) 492 return 0; 493 len -= i; 494 addr += PAGE_SIZE; 495 } 496 } 497 else 498 paddr += 16; 499 } 500 break; 501 502 default: 503 case FLUSH_SCOPE_PAGE: 504 len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1); 505 addr &= PAGE_MASK; 506 for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE) 507 { 508 if (!(paddr = virt_to_phys_060(addr))) 509 continue; 510 switch (cache) 511 { 512 case FLUSH_CACHE_DATA: 513 __asm__ __volatile__ (".chip 68060\n\t" 514 "cpushp %%dc,(%0)\n\t" 515 ".chip 68k" 516 : : "a" (paddr)); 517 break; 518 case FLUSH_CACHE_INSN: 519 __asm__ __volatile__ (".chip 68060\n\t" 520 "cpushp %%ic,(%0)\n\t" 521 ".chip 68k" 522 : : "a" (paddr)); 523 break; 524 default: 525 case FLUSH_CACHE_BOTH: 526 __asm__ __volatile__ (".chip 68060\n\t" 527 "cpushp %%bc,(%0)\n\t" 528 ".chip 68k" 529 : : "a" (paddr)); 530 break; 531 } 532 } 533 break; 534 } 535 return 0; 536} 537 538/* sys_cacheflush -- flush (part of) the processor cache. */ 539asmlinkage int 540sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len) 541{ 542 struct vm_area_struct *vma; 543 int ret = -EINVAL; 544 545 lock_kernel(); 546 if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL || 547 cache & ~FLUSH_CACHE_BOTH) 548 goto out; 549 550 if (scope == FLUSH_SCOPE_ALL) { 551 /* Only the superuser may explicitly flush the whole cache. */ 552 ret = -EPERM; 553 if (!capable(CAP_SYS_ADMIN)) 554 goto out; 555 } else { 556 /* 557 * Verify that the specified address region actually belongs 558 * to this process. 559 */ 560 vma = find_vma (current->mm, addr); 561 ret = -EINVAL; 562 /* Check for overflow. */ 563 if (addr + len < addr) 564 goto out; 565 if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) 566 goto out; 567 } 568 569 if (CPU_IS_020_OR_030) { 570 if (scope == FLUSH_SCOPE_LINE && len < 256) { 571 unsigned long cacr; 572 __asm__ ("movec %%cacr, %0" : "=r" (cacr)); 573 if (cache & FLUSH_CACHE_INSN) 574 cacr |= 4; 575 if (cache & FLUSH_CACHE_DATA) 576 cacr |= 0x400; 577 len >>= 2; 578 while (len--) { 579 __asm__ __volatile__ ("movec %1, %%caar\n\t" 580 "movec %0, %%cacr" 581 : /* no outputs */ 582 : "r" (cacr), "r" (addr)); 583 addr += 4; 584 } 585 } else { 586 /* Flush the whole cache, even if page granularity requested. */ 587 unsigned long cacr; 588 __asm__ ("movec %%cacr, %0" : "=r" (cacr)); 589 if (cache & FLUSH_CACHE_INSN) 590 cacr |= 8; 591 if (cache & FLUSH_CACHE_DATA) 592 cacr |= 0x800; 593 __asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr)); 594 } 595 ret = 0; 596 goto out; 597 } else { 598 /* 599 * 040 or 060: don't blindly trust 'scope', someone could 600 * try to flush a few megs of memory. 601 */ 602 603 if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE) 604 scope=FLUSH_SCOPE_PAGE; 605 if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL) 606 scope=FLUSH_SCOPE_ALL; 607 if (CPU_IS_040) { 608 ret = cache_flush_040 (addr, scope, cache, len); 609 } else if (CPU_IS_060) { 610 ret = cache_flush_060 (addr, scope, cache, len); 611 } 612 } 613out: 614 unlock_kernel(); 615 return ret; 616} 617 618asmlinkage int sys_getpagesize(void) 619{ 620 return PAGE_SIZE; 621} 622 623/* 624 * Do a system call from kernel instead of calling sys_execve so we 625 * end up with proper pt_regs. 626 */ 627int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 628{ 629 register long __res asm ("%d0") = __NR_execve; 630 register long __a asm ("%d1") = (long)(filename); 631 register long __b asm ("%d2") = (long)(argv); 632 register long __c asm ("%d3") = (long)(envp); 633 asm volatile ("trap #0" : "+d" (__res) 634 : "d" (__a), "d" (__b), "d" (__c)); 635 return __res; 636} 637