1 /* linux/arch/sparc/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/mm.h> 12 #include <linux/fs.h> 13 #include <linux/file.h> 14 #include <linux/sem.h> 15 #include <linux/msg.h> 16 #include <linux/shm.h> 17 #include <linux/stat.h> 18 #include <linux/syscalls.h> 19 #include <linux/mman.h> 20 #include <linux/utsname.h> 21 #include <linux/smp.h> 22 #include <linux/smp_lock.h> 23 #include <linux/ipc.h> 24 25 #include <asm/uaccess.h> 26 #include <asm/unistd.h> 27 28 /* #define DEBUG_UNIMP_SYSCALL */ 29 30 /* XXX Make this per-binary type, this way we can detect the type of 31 * XXX a binary. Every Sparc executable calls this very early on. 32 */ 33 asmlinkage unsigned long sys_getpagesize(void) 34 { 35 return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */ 36 } 37 38 #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1)) 39 40 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) 41 { 42 struct vm_area_struct * vmm; 43 44 if (flags & MAP_FIXED) { 45 /* We do not accept a shared mapping if it would violate 46 * cache aliasing constraints. 47 */ 48 if ((flags & MAP_SHARED) && 49 ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))) 50 return -EINVAL; 51 return addr; 52 } 53 54 /* See asm-sparc/uaccess.h */ 55 if (len > TASK_SIZE - PAGE_SIZE) 56 return -ENOMEM; 57 if (ARCH_SUN4C && len > 0x20000000) 58 return -ENOMEM; 59 if (!addr) 60 addr = TASK_UNMAPPED_BASE; 61 62 if (flags & MAP_SHARED) 63 addr = COLOUR_ALIGN(addr); 64 else 65 addr = PAGE_ALIGN(addr); 66 67 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 68 /* At this point: (!vmm || addr < vmm->vm_end). */ 69 if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) { 70 addr = PAGE_OFFSET; 71 vmm = find_vma(current->mm, PAGE_OFFSET); 72 } 73 if (TASK_SIZE - PAGE_SIZE - len < addr) 74 return -ENOMEM; 75 if (!vmm || addr + len <= vmm->vm_start) 76 return addr; 77 addr = vmm->vm_end; 78 if (flags & MAP_SHARED) 79 addr = COLOUR_ALIGN(addr); 80 } 81 } 82 83 /* 84 * sys_pipe() is the normal C calling standard for creating 85 * a pipe. It's not the way unix traditionally does this, though. 86 */ 87 asmlinkage int sparc_pipe(struct pt_regs *regs) 88 { 89 int fd[2]; 90 int error; 91 92 error = do_pipe_flags(fd, 0); 93 if (error) 94 goto out; 95 regs->u_regs[UREG_I1] = fd[1]; 96 error = fd[0]; 97 out: 98 return error; 99 } 100 101 /* 102 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 103 * 104 * This is really horribly ugly. 105 */ 106 107 asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth) 108 { 109 int version, err; 110 111 version = call >> 16; /* hack for backward compatibility */ 112 call &= 0xffff; 113 114 if (call <= SEMCTL) 115 switch (call) { 116 case SEMOP: 117 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); 118 goto out; 119 case SEMTIMEDOP: 120 err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth); 121 goto out; 122 case SEMGET: 123 err = sys_semget (first, second, third); 124 goto out; 125 case SEMCTL: { 126 union semun fourth; 127 err = -EINVAL; 128 if (!ptr) 129 goto out; 130 err = -EFAULT; 131 if (get_user(fourth.__pad, 132 (void __user * __user *)ptr)) 133 goto out; 134 err = sys_semctl (first, second, third, fourth); 135 goto out; 136 } 137 default: 138 err = -ENOSYS; 139 goto out; 140 } 141 if (call <= MSGCTL) 142 switch (call) { 143 case MSGSND: 144 err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 145 second, third); 146 goto out; 147 case MSGRCV: 148 switch (version) { 149 case 0: { 150 struct ipc_kludge tmp; 151 err = -EINVAL; 152 if (!ptr) 153 goto out; 154 err = -EFAULT; 155 if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp))) 156 goto out; 157 err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third); 158 goto out; 159 } 160 case 1: default: 161 err = sys_msgrcv (first, 162 (struct msgbuf __user *) ptr, 163 second, fifth, third); 164 goto out; 165 } 166 case MSGGET: 167 err = sys_msgget ((key_t) first, second); 168 goto out; 169 case MSGCTL: 170 err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr); 171 goto out; 172 default: 173 err = -ENOSYS; 174 goto out; 175 } 176 if (call <= SHMCTL) 177 switch (call) { 178 case SHMAT: 179 switch (version) { 180 case 0: default: { 181 ulong raddr; 182 err = do_shmat (first, (char __user *) ptr, second, &raddr); 183 if (err) 184 goto out; 185 err = -EFAULT; 186 if (put_user (raddr, (ulong __user *) third)) 187 goto out; 188 err = 0; 189 goto out; 190 } 191 case 1: /* iBCS2 emulator entry point */ 192 err = -EINVAL; 193 goto out; 194 } 195 case SHMDT: 196 err = sys_shmdt ((char __user *)ptr); 197 goto out; 198 case SHMGET: 199 err = sys_shmget (first, second, third); 200 goto out; 201 case SHMCTL: 202 err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr); 203 goto out; 204 default: 205 err = -ENOSYS; 206 goto out; 207 } 208 else 209 err = -ENOSYS; 210 out: 211 return err; 212 } 213 214 int sparc_mmap_check(unsigned long addr, unsigned long len) 215 { 216 if (ARCH_SUN4C && 217 (len > 0x20000000 || 218 (addr < 0xe0000000 && addr + len > 0x20000000))) 219 return -EINVAL; 220 221 /* See asm-sparc/uaccess.h */ 222 if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE) 223 return -EINVAL; 224 225 return 0; 226 } 227 228 /* Linux version of mmap */ 229 230 asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len, 231 unsigned long prot, unsigned long flags, unsigned long fd, 232 unsigned long pgoff) 233 { 234 /* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE 235 we have. */ 236 return sys_mmap_pgoff(addr, len, prot, flags, fd, 237 pgoff >> (PAGE_SHIFT - 12)); 238 } 239 240 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len, 241 unsigned long prot, unsigned long flags, unsigned long fd, 242 unsigned long off) 243 { 244 /* no alignment check? */ 245 return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 246 } 247 248 long sparc_remap_file_pages(unsigned long start, unsigned long size, 249 unsigned long prot, unsigned long pgoff, 250 unsigned long flags) 251 { 252 /* This works on an existing mmap so we don't need to validate 253 * the range as that was done at the original mmap call. 254 */ 255 return sys_remap_file_pages(start, size, prot, 256 (pgoff >> (PAGE_SHIFT - 12)), flags); 257 } 258 259 /* we come to here via sys_nis_syscall so it can setup the regs argument */ 260 asmlinkage unsigned long 261 c_sys_nis_syscall (struct pt_regs *regs) 262 { 263 static int count = 0; 264 265 if (count++ > 5) 266 return -ENOSYS; 267 printk ("%s[%d]: Unimplemented SPARC system call %d\n", 268 current->comm, task_pid_nr(current), (int)regs->u_regs[1]); 269 #ifdef DEBUG_UNIMP_SYSCALL 270 show_regs (regs); 271 #endif 272 return -ENOSYS; 273 } 274 275 /* #define DEBUG_SPARC_BREAKPOINT */ 276 277 asmlinkage void 278 sparc_breakpoint (struct pt_regs *regs) 279 { 280 siginfo_t info; 281 282 lock_kernel(); 283 #ifdef DEBUG_SPARC_BREAKPOINT 284 printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc); 285 #endif 286 info.si_signo = SIGTRAP; 287 info.si_errno = 0; 288 info.si_code = TRAP_BRKPT; 289 info.si_addr = (void __user *)regs->pc; 290 info.si_trapno = 0; 291 force_sig_info(SIGTRAP, &info, current); 292 293 #ifdef DEBUG_SPARC_BREAKPOINT 294 printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc); 295 #endif 296 unlock_kernel(); 297 } 298 299 asmlinkage int 300 sparc_sigaction (int sig, const struct old_sigaction __user *act, 301 struct old_sigaction __user *oact) 302 { 303 struct k_sigaction new_ka, old_ka; 304 int ret; 305 306 WARN_ON_ONCE(sig >= 0); 307 sig = -sig; 308 309 if (act) { 310 unsigned long mask; 311 312 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 313 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 314 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 315 return -EFAULT; 316 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 317 __get_user(mask, &act->sa_mask); 318 siginitset(&new_ka.sa.sa_mask, mask); 319 new_ka.ka_restorer = NULL; 320 } 321 322 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 323 324 if (!ret && oact) { 325 /* In the clone() case we could copy half consistent 326 * state to the user, however this could sleep and 327 * deadlock us if we held the signal lock on SMP. So for 328 * now I take the easy way out and do no locking. 329 */ 330 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 331 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 332 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 333 return -EFAULT; 334 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 335 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 336 } 337 338 return ret; 339 } 340 341 asmlinkage long 342 sys_rt_sigaction(int sig, 343 const struct sigaction __user *act, 344 struct sigaction __user *oact, 345 void __user *restorer, 346 size_t sigsetsize) 347 { 348 struct k_sigaction new_ka, old_ka; 349 int ret; 350 351 /* XXX: Don't preclude handling different sized sigset_t's. */ 352 if (sigsetsize != sizeof(sigset_t)) 353 return -EINVAL; 354 355 if (act) { 356 new_ka.ka_restorer = restorer; 357 if (copy_from_user(&new_ka.sa, act, sizeof(*act))) 358 return -EFAULT; 359 } 360 361 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 362 363 if (!ret && oact) { 364 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact))) 365 return -EFAULT; 366 } 367 368 return ret; 369 } 370 371 asmlinkage int sys_getdomainname(char __user *name, int len) 372 { 373 int nlen, err; 374 375 if (len < 0) 376 return -EINVAL; 377 378 down_read(&uts_sem); 379 380 nlen = strlen(utsname()->domainname) + 1; 381 err = -EINVAL; 382 if (nlen > len) 383 goto out; 384 385 err = -EFAULT; 386 if (!copy_to_user(name, utsname()->domainname, nlen)) 387 err = 0; 388 389 out: 390 up_read(&uts_sem); 391 return err; 392 } 393 394 /* 395 * Do a system call from kernel instead of calling sys_execve so we 396 * end up with proper pt_regs. 397 */ 398 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 399 { 400 long __res; 401 register long __g1 __asm__ ("g1") = __NR_execve; 402 register long __o0 __asm__ ("o0") = (long)(filename); 403 register long __o1 __asm__ ("o1") = (long)(argv); 404 register long __o2 __asm__ ("o2") = (long)(envp); 405 asm volatile ("t 0x10\n\t" 406 "bcc 1f\n\t" 407 "mov %%o0, %0\n\t" 408 "sub %%g0, %%o0, %0\n\t" 409 "1:\n\t" 410 : "=r" (__res), "=&r" (__o0) 411 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1) 412 : "cc"); 413 return __res; 414 } 415