1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Copyright (C) 2001 MIPS Technologies, Inc. 9 */ 10 #include <linux/a.out.h> 11 #include <linux/errno.h> 12 #include <linux/linkage.h> 13 #include <linux/mm.h> 14 #include <linux/smp.h> 15 #include <linux/smp_lock.h> 16 #include <linux/mman.h> 17 #include <linux/ptrace.h> 18 #include <linux/sched.h> 19 #include <linux/string.h> 20 #include <linux/syscalls.h> 21 #include <linux/file.h> 22 #include <linux/slab.h> 23 #include <linux/utsname.h> 24 #include <linux/unistd.h> 25 #include <linux/sem.h> 26 #include <linux/msg.h> 27 #include <linux/shm.h> 28 #include <linux/compiler.h> 29 30 #include <asm/branch.h> 31 #include <asm/cachectl.h> 32 #include <asm/cacheflush.h> 33 #include <asm/ipc.h> 34 #include <asm/offset.h> 35 #include <asm/signal.h> 36 #include <asm/sim.h> 37 #include <asm/shmparam.h> 38 #include <asm/sysmips.h> 39 #include <asm/uaccess.h> 40 41 asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs) 42 { 43 int fd[2]; 44 int error, res; 45 46 error = do_pipe(fd); 47 if (error) { 48 res = error; 49 goto out; 50 } 51 regs.regs[3] = fd[1]; 52 res = fd[0]; 53 out: 54 return res; 55 } 56 57 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 58 59 #define COLOUR_ALIGN(addr,pgoff) \ 60 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 61 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 62 63 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 64 unsigned long len, unsigned long pgoff, unsigned long flags) 65 { 66 struct vm_area_struct * vmm; 67 int do_color_align; 68 unsigned long task_size; 69 70 task_size = STACK_TOP; 71 72 if (flags & MAP_FIXED) { 73 /* 74 * We do not accept a shared mapping if it would violate 75 * cache aliasing constraints. 76 */ 77 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 78 return -EINVAL; 79 return addr; 80 } 81 82 if (len > task_size) 83 return -ENOMEM; 84 do_color_align = 0; 85 if (filp || (flags & MAP_SHARED)) 86 do_color_align = 1; 87 if (addr) { 88 if (do_color_align) 89 addr = COLOUR_ALIGN(addr, pgoff); 90 else 91 addr = PAGE_ALIGN(addr); 92 vmm = find_vma(current->mm, addr); 93 if (task_size - len >= addr && 94 (!vmm || addr + len <= vmm->vm_start)) 95 return addr; 96 } 97 addr = TASK_UNMAPPED_BASE; 98 if (do_color_align) 99 addr = COLOUR_ALIGN(addr, pgoff); 100 else 101 addr = PAGE_ALIGN(addr); 102 103 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 104 /* At this point: (!vmm || addr < vmm->vm_end). */ 105 if (task_size - len < addr) 106 return -ENOMEM; 107 if (!vmm || addr + len <= vmm->vm_start) 108 return addr; 109 addr = vmm->vm_end; 110 if (do_color_align) 111 addr = COLOUR_ALIGN(addr, pgoff); 112 } 113 } 114 115 /* common code for old and new mmaps */ 116 static inline unsigned long 117 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 118 unsigned long flags, unsigned long fd, unsigned long pgoff) 119 { 120 unsigned long error = -EBADF; 121 struct file * file = NULL; 122 123 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 124 if (!(flags & MAP_ANONYMOUS)) { 125 file = fget(fd); 126 if (!file) 127 goto out; 128 } 129 130 down_write(¤t->mm->mmap_sem); 131 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 132 up_write(¤t->mm->mmap_sem); 133 134 if (file) 135 fput(file); 136 out: 137 return error; 138 } 139 140 asmlinkage unsigned long 141 old_mmap(unsigned long addr, unsigned long len, int prot, 142 int flags, int fd, off_t offset) 143 { 144 unsigned long result; 145 146 result = -EINVAL; 147 if (offset & ~PAGE_MASK) 148 goto out; 149 150 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 151 152 out: 153 return result; 154 } 155 156 asmlinkage unsigned long 157 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 158 unsigned long flags, unsigned long fd, unsigned long pgoff) 159 { 160 return do_mmap2(addr, len, prot, flags, fd, pgoff); 161 } 162 163 save_static_function(sys_fork); 164 __attribute_used__ noinline static int 165 _sys_fork(nabi_no_regargs struct pt_regs regs) 166 { 167 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 168 } 169 170 save_static_function(sys_clone); 171 __attribute_used__ noinline static int 172 _sys_clone(nabi_no_regargs struct pt_regs regs) 173 { 174 unsigned long clone_flags; 175 unsigned long newsp; 176 int *parent_tidptr, *child_tidptr; 177 178 clone_flags = regs.regs[4]; 179 newsp = regs.regs[5]; 180 if (!newsp) 181 newsp = regs.regs[29]; 182 parent_tidptr = (int *) regs.regs[6]; 183 child_tidptr = (int *) regs.regs[7]; 184 return do_fork(clone_flags, newsp, ®s, 0, 185 parent_tidptr, child_tidptr); 186 } 187 188 /* 189 * sys_execve() executes a new program. 190 */ 191 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 192 { 193 int error; 194 char * filename; 195 196 filename = getname((char *) (long)regs.regs[4]); 197 error = PTR_ERR(filename); 198 if (IS_ERR(filename)) 199 goto out; 200 error = do_execve(filename, (char **) (long)regs.regs[5], 201 (char **) (long)regs.regs[6], ®s); 202 putname(filename); 203 204 out: 205 return error; 206 } 207 208 /* 209 * Compacrapability ... 210 */ 211 asmlinkage int sys_uname(struct old_utsname * name) 212 { 213 if (name && !copy_to_user(name, &system_utsname, sizeof (*name))) 214 return 0; 215 return -EFAULT; 216 } 217 218 /* 219 * Compacrapability ... 220 */ 221 asmlinkage int sys_olduname(struct oldold_utsname * name) 222 { 223 int error; 224 225 if (!name) 226 return -EFAULT; 227 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) 228 return -EFAULT; 229 230 error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); 231 error -= __put_user(0,name->sysname+__OLD_UTS_LEN); 232 error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); 233 error -= __put_user(0,name->nodename+__OLD_UTS_LEN); 234 error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); 235 error -= __put_user(0,name->release+__OLD_UTS_LEN); 236 error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); 237 error -= __put_user(0,name->version+__OLD_UTS_LEN); 238 error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); 239 error = __put_user(0,name->machine+__OLD_UTS_LEN); 240 error = error ? -EFAULT : 0; 241 242 return error; 243 } 244 245 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3) 246 { 247 int tmp, len; 248 char *name; 249 250 switch(cmd) { 251 case SETNAME: { 252 char nodename[__NEW_UTS_LEN + 1]; 253 254 if (!capable(CAP_SYS_ADMIN)) 255 return -EPERM; 256 257 name = (char *) arg1; 258 259 len = strncpy_from_user(nodename, name, __NEW_UTS_LEN); 260 if (len < 0) 261 return -EFAULT; 262 263 down_write(&uts_sem); 264 strncpy(system_utsname.nodename, nodename, len); 265 nodename[__NEW_UTS_LEN] = '\0'; 266 strlcpy(system_utsname.nodename, nodename, 267 sizeof(system_utsname.nodename)); 268 up_write(&uts_sem); 269 return 0; 270 } 271 272 case MIPS_ATOMIC_SET: 273 printk(KERN_CRIT "How did I get here?\n"); 274 return -EINVAL; 275 276 case MIPS_FIXADE: 277 tmp = current->thread.mflags & ~3; 278 current->thread.mflags = tmp | (arg1 & 3); 279 return 0; 280 281 case FLUSH_CACHE: 282 __flush_cache_all(); 283 return 0; 284 285 case MIPS_RDNVRAM: 286 return -EIO; 287 } 288 289 return -EINVAL; 290 } 291 292 /* 293 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 294 * 295 * This is really horribly ugly. 296 */ 297 asmlinkage int sys_ipc (uint call, int first, int second, 298 unsigned long third, void *ptr, long fifth) 299 { 300 int version, ret; 301 302 version = call >> 16; /* hack for backward compatibility */ 303 call &= 0xffff; 304 305 switch (call) { 306 case SEMOP: 307 return sys_semtimedop (first, (struct sembuf *)ptr, second, 308 NULL); 309 case SEMTIMEDOP: 310 return sys_semtimedop (first, (struct sembuf *)ptr, second, 311 (const struct timespec __user *)fifth); 312 case SEMGET: 313 return sys_semget (first, second, third); 314 case SEMCTL: { 315 union semun fourth; 316 if (!ptr) 317 return -EINVAL; 318 if (get_user(fourth.__pad, (void **) ptr)) 319 return -EFAULT; 320 return sys_semctl (first, second, third, fourth); 321 } 322 323 case MSGSND: 324 return sys_msgsnd (first, (struct msgbuf *) ptr, 325 second, third); 326 case MSGRCV: 327 switch (version) { 328 case 0: { 329 struct ipc_kludge tmp; 330 if (!ptr) 331 return -EINVAL; 332 333 if (copy_from_user(&tmp, 334 (struct ipc_kludge *) ptr, 335 sizeof (tmp))) 336 return -EFAULT; 337 return sys_msgrcv (first, tmp.msgp, second, 338 tmp.msgtyp, third); 339 } 340 default: 341 return sys_msgrcv (first, 342 (struct msgbuf *) ptr, 343 second, fifth, third); 344 } 345 case MSGGET: 346 return sys_msgget ((key_t) first, second); 347 case MSGCTL: 348 return sys_msgctl (first, second, (struct msqid_ds *) ptr); 349 350 case SHMAT: 351 switch (version) { 352 default: { 353 ulong raddr; 354 ret = do_shmat (first, (char *) ptr, second, &raddr); 355 if (ret) 356 return ret; 357 return put_user (raddr, (ulong *) third); 358 } 359 case 1: /* iBCS2 emulator entry point */ 360 if (!segment_eq(get_fs(), get_ds())) 361 return -EINVAL; 362 return do_shmat (first, (char *) ptr, second, (ulong *) third); 363 } 364 case SHMDT: 365 return sys_shmdt ((char *)ptr); 366 case SHMGET: 367 return sys_shmget (first, second, third); 368 case SHMCTL: 369 return sys_shmctl (first, second, 370 (struct shmid_ds *) ptr); 371 default: 372 return -ENOSYS; 373 } 374 } 375 376 /* 377 * Native ABI that is O32 or N64 version 378 */ 379 asmlinkage long sys_shmat(int shmid, char __user *shmaddr, 380 int shmflg, unsigned long *addr) 381 { 382 unsigned long raddr; 383 int err; 384 385 err = do_shmat(shmid, shmaddr, shmflg, &raddr); 386 if (err) 387 return err; 388 389 return put_user(raddr, addr); 390 } 391 392 /* 393 * No implemented yet ... 394 */ 395 asmlinkage int sys_cachectl(char *addr, int nbytes, int op) 396 { 397 return -ENOSYS; 398 } 399 400 /* 401 * If we ever come here the user sp is bad. Zap the process right away. 402 * Due to the bad stack signaling wouldn't work. 403 */ 404 asmlinkage void bad_stack(void) 405 { 406 do_exit(SIGSEGV); 407 } 408