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/config.h> 11 #include <linux/a.out.h> 12 #include <linux/errno.h> 13 #include <linux/linkage.h> 14 #include <linux/mm.h> 15 #include <linux/smp.h> 16 #include <linux/smp_lock.h> 17 #include <linux/mman.h> 18 #include <linux/ptrace.h> 19 #include <linux/sched.h> 20 #include <linux/string.h> 21 #include <linux/syscalls.h> 22 #include <linux/file.h> 23 #include <linux/slab.h> 24 #include <linux/utsname.h> 25 #include <linux/unistd.h> 26 #include <linux/sem.h> 27 #include <linux/msg.h> 28 #include <linux/shm.h> 29 #include <linux/compiler.h> 30 #include <linux/module.h> 31 32 #include <asm/branch.h> 33 #include <asm/cachectl.h> 34 #include <asm/cacheflush.h> 35 #include <asm/ipc.h> 36 #include <asm/asm-offsets.h> 37 #include <asm/signal.h> 38 #include <asm/sim.h> 39 #include <asm/shmparam.h> 40 #include <asm/sysmips.h> 41 #include <asm/uaccess.h> 42 43 asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs) 44 { 45 int fd[2]; 46 int error, res; 47 48 error = do_pipe(fd); 49 if (error) { 50 res = error; 51 goto out; 52 } 53 regs.regs[3] = fd[1]; 54 res = fd[0]; 55 out: 56 return res; 57 } 58 59 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 60 61 EXPORT_SYMBOL(shm_align_mask); 62 63 #define COLOUR_ALIGN(addr,pgoff) \ 64 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 65 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 66 67 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 68 unsigned long len, unsigned long pgoff, unsigned long flags) 69 { 70 struct vm_area_struct * vmm; 71 int do_color_align; 72 unsigned long task_size; 73 74 task_size = STACK_TOP; 75 76 if (flags & MAP_FIXED) { 77 /* 78 * We do not accept a shared mapping if it would violate 79 * cache aliasing constraints. 80 */ 81 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 82 return -EINVAL; 83 return addr; 84 } 85 86 if (len > task_size) 87 return -ENOMEM; 88 do_color_align = 0; 89 if (filp || (flags & MAP_SHARED)) 90 do_color_align = 1; 91 if (addr) { 92 if (do_color_align) 93 addr = COLOUR_ALIGN(addr, pgoff); 94 else 95 addr = PAGE_ALIGN(addr); 96 vmm = find_vma(current->mm, addr); 97 if (task_size - len >= addr && 98 (!vmm || addr + len <= vmm->vm_start)) 99 return addr; 100 } 101 addr = TASK_UNMAPPED_BASE; 102 if (do_color_align) 103 addr = COLOUR_ALIGN(addr, pgoff); 104 else 105 addr = PAGE_ALIGN(addr); 106 107 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 108 /* At this point: (!vmm || addr < vmm->vm_end). */ 109 if (task_size - len < addr) 110 return -ENOMEM; 111 if (!vmm || addr + len <= vmm->vm_start) 112 return addr; 113 addr = vmm->vm_end; 114 if (do_color_align) 115 addr = COLOUR_ALIGN(addr, pgoff); 116 } 117 } 118 119 /* common code for old and new mmaps */ 120 static inline unsigned long 121 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 122 unsigned long flags, unsigned long fd, unsigned long pgoff) 123 { 124 unsigned long error = -EBADF; 125 struct file * file = NULL; 126 127 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 128 if (!(flags & MAP_ANONYMOUS)) { 129 file = fget(fd); 130 if (!file) 131 goto out; 132 } 133 134 down_write(¤t->mm->mmap_sem); 135 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 136 up_write(¤t->mm->mmap_sem); 137 138 if (file) 139 fput(file); 140 out: 141 return error; 142 } 143 144 asmlinkage unsigned long 145 old_mmap(unsigned long addr, unsigned long len, int prot, 146 int flags, int fd, off_t offset) 147 { 148 unsigned long result; 149 150 result = -EINVAL; 151 if (offset & ~PAGE_MASK) 152 goto out; 153 154 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 155 156 out: 157 return result; 158 } 159 160 asmlinkage unsigned long 161 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 162 unsigned long flags, unsigned long fd, unsigned long pgoff) 163 { 164 return do_mmap2(addr, len, prot, flags, fd, pgoff); 165 } 166 167 save_static_function(sys_fork); 168 __attribute_used__ noinline static int 169 _sys_fork(nabi_no_regargs struct pt_regs regs) 170 { 171 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 172 } 173 174 save_static_function(sys_clone); 175 __attribute_used__ noinline static int 176 _sys_clone(nabi_no_regargs struct pt_regs regs) 177 { 178 unsigned long clone_flags; 179 unsigned long newsp; 180 int __user *parent_tidptr, *child_tidptr; 181 182 clone_flags = regs.regs[4]; 183 newsp = regs.regs[5]; 184 if (!newsp) 185 newsp = regs.regs[29]; 186 parent_tidptr = (int __user *) regs.regs[6]; 187 #ifdef CONFIG_32BIT 188 /* We need to fetch the fifth argument off the stack. */ 189 child_tidptr = NULL; 190 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 191 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 192 if (regs.regs[2] == __NR_syscall) { 193 if (get_user (child_tidptr, &usp[5])) 194 return -EFAULT; 195 } 196 else if (get_user (child_tidptr, &usp[4])) 197 return -EFAULT; 198 } 199 #else 200 child_tidptr = (int __user *) regs.regs[8]; 201 #endif 202 return do_fork(clone_flags, newsp, ®s, 0, 203 parent_tidptr, child_tidptr); 204 } 205 206 /* 207 * sys_execve() executes a new program. 208 */ 209 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 210 { 211 int error; 212 char * filename; 213 214 filename = getname((char *) (long)regs.regs[4]); 215 error = PTR_ERR(filename); 216 if (IS_ERR(filename)) 217 goto out; 218 error = do_execve(filename, (char **) (long)regs.regs[5], 219 (char **) (long)regs.regs[6], ®s); 220 putname(filename); 221 222 out: 223 return error; 224 } 225 226 /* 227 * Compacrapability ... 228 */ 229 asmlinkage int sys_uname(struct old_utsname * name) 230 { 231 if (name && !copy_to_user(name, &system_utsname, sizeof (*name))) 232 return 0; 233 return -EFAULT; 234 } 235 236 /* 237 * Compacrapability ... 238 */ 239 asmlinkage int sys_olduname(struct oldold_utsname * name) 240 { 241 int error; 242 243 if (!name) 244 return -EFAULT; 245 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) 246 return -EFAULT; 247 248 error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); 249 error -= __put_user(0,name->sysname+__OLD_UTS_LEN); 250 error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); 251 error -= __put_user(0,name->nodename+__OLD_UTS_LEN); 252 error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); 253 error -= __put_user(0,name->release+__OLD_UTS_LEN); 254 error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); 255 error -= __put_user(0,name->version+__OLD_UTS_LEN); 256 error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); 257 error = __put_user(0,name->machine+__OLD_UTS_LEN); 258 error = error ? -EFAULT : 0; 259 260 return error; 261 } 262 263 void sys_set_thread_area(unsigned long addr) 264 { 265 struct thread_info *ti = current->thread_info; 266 267 ti->tp_value = addr; 268 269 /* If some future MIPS implementation has this register in hardware, 270 * we will need to update it here (and in context switches). */ 271 } 272 273 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3) 274 { 275 int tmp, len; 276 char *name; 277 278 switch(cmd) { 279 case SETNAME: { 280 char nodename[__NEW_UTS_LEN + 1]; 281 282 if (!capable(CAP_SYS_ADMIN)) 283 return -EPERM; 284 285 name = (char *) arg1; 286 287 len = strncpy_from_user(nodename, name, __NEW_UTS_LEN); 288 if (len < 0) 289 return -EFAULT; 290 291 down_write(&uts_sem); 292 strncpy(system_utsname.nodename, nodename, len); 293 nodename[__NEW_UTS_LEN] = '\0'; 294 strlcpy(system_utsname.nodename, nodename, 295 sizeof(system_utsname.nodename)); 296 up_write(&uts_sem); 297 return 0; 298 } 299 300 case MIPS_ATOMIC_SET: 301 printk(KERN_CRIT "How did I get here?\n"); 302 return -EINVAL; 303 304 case MIPS_FIXADE: 305 tmp = current->thread.mflags & ~3; 306 current->thread.mflags = tmp | (arg1 & 3); 307 return 0; 308 309 case FLUSH_CACHE: 310 __flush_cache_all(); 311 return 0; 312 313 case MIPS_RDNVRAM: 314 return -EIO; 315 } 316 317 return -EINVAL; 318 } 319 320 /* 321 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 322 * 323 * This is really horribly ugly. 324 */ 325 asmlinkage int sys_ipc (uint call, int first, int second, 326 unsigned long third, void *ptr, long fifth) 327 { 328 int version, ret; 329 330 version = call >> 16; /* hack for backward compatibility */ 331 call &= 0xffff; 332 333 switch (call) { 334 case SEMOP: 335 return sys_semtimedop (first, (struct sembuf *)ptr, second, 336 NULL); 337 case SEMTIMEDOP: 338 return sys_semtimedop (first, (struct sembuf *)ptr, second, 339 (const struct timespec __user *)fifth); 340 case SEMGET: 341 return sys_semget (first, second, third); 342 case SEMCTL: { 343 union semun fourth; 344 if (!ptr) 345 return -EINVAL; 346 if (get_user(fourth.__pad, (void **) ptr)) 347 return -EFAULT; 348 return sys_semctl (first, second, third, fourth); 349 } 350 351 case MSGSND: 352 return sys_msgsnd (first, (struct msgbuf *) ptr, 353 second, third); 354 case MSGRCV: 355 switch (version) { 356 case 0: { 357 struct ipc_kludge tmp; 358 if (!ptr) 359 return -EINVAL; 360 361 if (copy_from_user(&tmp, 362 (struct ipc_kludge *) ptr, 363 sizeof (tmp))) 364 return -EFAULT; 365 return sys_msgrcv (first, tmp.msgp, second, 366 tmp.msgtyp, third); 367 } 368 default: 369 return sys_msgrcv (first, 370 (struct msgbuf *) ptr, 371 second, fifth, third); 372 } 373 case MSGGET: 374 return sys_msgget ((key_t) first, second); 375 case MSGCTL: 376 return sys_msgctl (first, second, (struct msqid_ds *) ptr); 377 378 case SHMAT: 379 switch (version) { 380 default: { 381 ulong raddr; 382 ret = do_shmat (first, (char *) ptr, second, &raddr); 383 if (ret) 384 return ret; 385 return put_user (raddr, (ulong *) third); 386 } 387 case 1: /* iBCS2 emulator entry point */ 388 if (!segment_eq(get_fs(), get_ds())) 389 return -EINVAL; 390 return do_shmat (first, (char *) ptr, second, (ulong *) third); 391 } 392 case SHMDT: 393 return sys_shmdt ((char *)ptr); 394 case SHMGET: 395 return sys_shmget (first, second, third); 396 case SHMCTL: 397 return sys_shmctl (first, second, 398 (struct shmid_ds *) ptr); 399 default: 400 return -ENOSYS; 401 } 402 } 403 404 /* 405 * No implemented yet ... 406 */ 407 asmlinkage int sys_cachectl(char *addr, int nbytes, int op) 408 { 409 return -ENOSYS; 410 } 411 412 /* 413 * If we ever come here the user sp is bad. Zap the process right away. 414 * Due to the bad stack signaling wouldn't work. 415 */ 416 asmlinkage void bad_stack(void) 417 { 418 do_exit(SIGSEGV); 419 } 420