| 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 COLOUR_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 = COLOUR_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 = COLOUR_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 | /* |
| 650 | * Do a system call from kernel instead of calling sys_execve so we |
| 651 | * end up with proper pt_regs. |
| 652 | */ |
| 653 | int kernel_execve(const char *filename, |
| 654 | const char *const argv[], |
| 655 | const char *const envp[]) |
| 656 | { |
| 657 | long __res; |
| 658 | register long __g1 __asm__ ("g1") = __NR_execve; |
| 659 | register long __o0 __asm__ ("o0") = (long)(filename); |
| 660 | register long __o1 __asm__ ("o1") = (long)(argv); |
| 661 | register long __o2 __asm__ ("o2") = (long)(envp); |
| 662 | asm volatile ("t 0x6d\n\t" |
| 663 | "sub %%g0, %%o0, %0\n\t" |
| 664 | "movcc %%xcc, %%o0, %0\n\t" |
| 665 | : "=r" (__res), "=&r" (__o0) |
| 666 | : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) |
| 667 | : "cc"); |
| 668 | return __res; |
| 669 | } |
| 670 | |
| 671 | asmlinkage long sys_kern_features(void) |
| 672 | { |
| 673 | return KERN_FEATURE_MIXED_MODE_STACK; |
| 674 | } |