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/capability.h> 12 #include <linux/errno.h> 13 #include <linux/linkage.h> 14 #include <linux/mm.h> 15 #include <linux/fs.h> 16 #include <linux/smp.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 #include <linux/ipc.h> 32 33 #include <asm/branch.h> 34 #include <asm/cachectl.h> 35 #include <asm/cacheflush.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 (len > task_size) 77 return -ENOMEM; 78 79 if (flags & MAP_FIXED) { 80 /* Even MAP_FIXED mappings must reside within task_size. */ 81 if (task_size - len < addr) 82 return -EINVAL; 83 84 /* 85 * We do not accept a shared mapping if it would violate 86 * cache aliasing constraints. 87 */ 88 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 89 return -EINVAL; 90 return addr; 91 } 92 93 do_color_align = 0; 94 if (filp || (flags & MAP_SHARED)) 95 do_color_align = 1; 96 if (addr) { 97 if (do_color_align) 98 addr = COLOUR_ALIGN(addr, pgoff); 99 else 100 addr = PAGE_ALIGN(addr); 101 vmm = find_vma(current->mm, addr); 102 if (task_size - len >= addr && 103 (!vmm || addr + len <= vmm->vm_start)) 104 return addr; 105 } 106 addr = TASK_UNMAPPED_BASE; 107 if (do_color_align) 108 addr = COLOUR_ALIGN(addr, pgoff); 109 else 110 addr = PAGE_ALIGN(addr); 111 112 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 113 /* At this point: (!vmm || addr < vmm->vm_end). */ 114 if (task_size - len < addr) 115 return -ENOMEM; 116 if (!vmm || addr + len <= vmm->vm_start) 117 return addr; 118 addr = vmm->vm_end; 119 if (do_color_align) 120 addr = COLOUR_ALIGN(addr, pgoff); 121 } 122 } 123 124 /* common code for old and new mmaps */ 125 static inline unsigned long 126 do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 127 unsigned long flags, unsigned long fd, unsigned long pgoff) 128 { 129 unsigned long error = -EBADF; 130 struct file * file = NULL; 131 132 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 133 if (!(flags & MAP_ANONYMOUS)) { 134 file = fget(fd); 135 if (!file) 136 goto out; 137 } 138 139 down_write(¤t->mm->mmap_sem); 140 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 141 up_write(¤t->mm->mmap_sem); 142 143 if (file) 144 fput(file); 145 out: 146 return error; 147 } 148 149 asmlinkage unsigned long 150 old_mmap(unsigned long addr, unsigned long len, int prot, 151 int flags, int fd, off_t offset) 152 { 153 unsigned long result; 154 155 result = -EINVAL; 156 if (offset & ~PAGE_MASK) 157 goto out; 158 159 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 160 161 out: 162 return result; 163 } 164 165 asmlinkage unsigned long 166 sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 167 unsigned long flags, unsigned long fd, unsigned long pgoff) 168 { 169 if (pgoff & (~PAGE_MASK >> 12)) 170 return -EINVAL; 171 172 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 173 } 174 175 save_static_function(sys_fork); 176 static int __used noinline 177 _sys_fork(nabi_no_regargs struct pt_regs regs) 178 { 179 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 180 } 181 182 save_static_function(sys_clone); 183 static int __used noinline 184 _sys_clone(nabi_no_regargs struct pt_regs regs) 185 { 186 unsigned long clone_flags; 187 unsigned long newsp; 188 int __user *parent_tidptr, *child_tidptr; 189 190 clone_flags = regs.regs[4]; 191 newsp = regs.regs[5]; 192 if (!newsp) 193 newsp = regs.regs[29]; 194 parent_tidptr = (int __user *) regs.regs[6]; 195 #ifdef CONFIG_32BIT 196 /* We need to fetch the fifth argument off the stack. */ 197 child_tidptr = NULL; 198 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 199 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 200 if (regs.regs[2] == __NR_syscall) { 201 if (get_user (child_tidptr, &usp[5])) 202 return -EFAULT; 203 } 204 else if (get_user (child_tidptr, &usp[4])) 205 return -EFAULT; 206 } 207 #else 208 child_tidptr = (int __user *) regs.regs[8]; 209 #endif 210 return do_fork(clone_flags, newsp, ®s, 0, 211 parent_tidptr, child_tidptr); 212 } 213 214 /* 215 * sys_execve() executes a new program. 216 */ 217 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 218 { 219 int error; 220 char * filename; 221 222 filename = getname((char __user *) (long)regs.regs[4]); 223 error = PTR_ERR(filename); 224 if (IS_ERR(filename)) 225 goto out; 226 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 227 (char __user *__user *) (long)regs.regs[6], ®s); 228 putname(filename); 229 230 out: 231 return error; 232 } 233 234 /* 235 * Compacrapability ... 236 */ 237 asmlinkage int sys_uname(struct old_utsname __user * name) 238 { 239 if (name && !copy_to_user(name, utsname(), sizeof (*name))) 240 return 0; 241 return -EFAULT; 242 } 243 244 /* 245 * Compacrapability ... 246 */ 247 asmlinkage int sys_olduname(struct oldold_utsname __user * name) 248 { 249 int error; 250 251 if (!name) 252 return -EFAULT; 253 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 254 return -EFAULT; 255 256 error = __copy_to_user(&name->sysname, &utsname()->sysname, 257 __OLD_UTS_LEN); 258 error -= __put_user(0, name->sysname + __OLD_UTS_LEN); 259 error -= __copy_to_user(&name->nodename, &utsname()->nodename, 260 __OLD_UTS_LEN); 261 error -= __put_user(0, name->nodename + __OLD_UTS_LEN); 262 error -= __copy_to_user(&name->release, &utsname()->release, 263 __OLD_UTS_LEN); 264 error -= __put_user(0, name->release + __OLD_UTS_LEN); 265 error -= __copy_to_user(&name->version, &utsname()->version, 266 __OLD_UTS_LEN); 267 error -= __put_user(0, name->version + __OLD_UTS_LEN); 268 error -= __copy_to_user(&name->machine, &utsname()->machine, 269 __OLD_UTS_LEN); 270 error = __put_user(0, name->machine + __OLD_UTS_LEN); 271 error = error ? -EFAULT : 0; 272 273 return error; 274 } 275 276 asmlinkage int sys_set_thread_area(unsigned long addr) 277 { 278 struct thread_info *ti = task_thread_info(current); 279 280 ti->tp_value = addr; 281 if (cpu_has_userlocal) 282 write_c0_userlocal(addr); 283 284 return 0; 285 } 286 287 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3) 288 { 289 switch (cmd) { 290 case MIPS_ATOMIC_SET: 291 printk(KERN_CRIT "How did I get here?\n"); 292 return -EINVAL; 293 294 case MIPS_FIXADE: 295 if (arg1 & ~3) 296 return -EINVAL; 297 298 if (arg1 & 1) 299 set_thread_flag(TIF_FIXADE); 300 else 301 clear_thread_flag(TIF_FIXADE); 302 if (arg1 & 2) 303 set_thread_flag(TIF_LOGADE); 304 else 305 clear_thread_flag(TIF_FIXADE); 306 307 return 0; 308 309 case FLUSH_CACHE: 310 __flush_cache_all(); 311 return 0; 312 } 313 314 return -EINVAL; 315 } 316 317 /* 318 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 319 * 320 * This is really horribly ugly. 321 */ 322 asmlinkage int sys_ipc(unsigned int call, int first, int second, 323 unsigned long third, void __user *ptr, long fifth) 324 { 325 int version, ret; 326 327 version = call >> 16; /* hack for backward compatibility */ 328 call &= 0xffff; 329 330 switch (call) { 331 case SEMOP: 332 return sys_semtimedop(first, (struct sembuf __user *)ptr, 333 second, NULL); 334 case SEMTIMEDOP: 335 return sys_semtimedop(first, (struct sembuf __user *)ptr, 336 second, 337 (const struct timespec __user *)fifth); 338 case SEMGET: 339 return sys_semget(first, second, third); 340 case SEMCTL: { 341 union semun fourth; 342 if (!ptr) 343 return -EINVAL; 344 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 345 return -EFAULT; 346 return sys_semctl(first, second, third, fourth); 347 } 348 349 case MSGSND: 350 return sys_msgsnd(first, (struct msgbuf __user *) ptr, 351 second, third); 352 case MSGRCV: 353 switch (version) { 354 case 0: { 355 struct ipc_kludge tmp; 356 if (!ptr) 357 return -EINVAL; 358 359 if (copy_from_user(&tmp, 360 (struct ipc_kludge __user *) ptr, 361 sizeof(tmp))) 362 return -EFAULT; 363 return sys_msgrcv(first, tmp.msgp, second, 364 tmp.msgtyp, third); 365 } 366 default: 367 return sys_msgrcv(first, 368 (struct msgbuf __user *) ptr, 369 second, fifth, third); 370 } 371 case MSGGET: 372 return sys_msgget((key_t) first, second); 373 case MSGCTL: 374 return sys_msgctl(first, second, 375 (struct msqid_ds __user *) ptr); 376 377 case SHMAT: 378 switch (version) { 379 default: { 380 unsigned long raddr; 381 ret = do_shmat(first, (char __user *) ptr, second, 382 &raddr); 383 if (ret) 384 return ret; 385 return put_user(raddr, (unsigned long __user *) 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 __user *) ptr, second, 391 (unsigned long *) third); 392 } 393 case SHMDT: 394 return sys_shmdt((char __user *)ptr); 395 case SHMGET: 396 return sys_shmget(first, second, third); 397 case SHMCTL: 398 return sys_shmctl(first, second, 399 (struct shmid_ds __user *) ptr); 400 default: 401 return -ENOSYS; 402 } 403 } 404 405 /* 406 * No implemented yet ... 407 */ 408 asmlinkage int sys_cachectl(char *addr, int nbytes, int op) 409 { 410 return -ENOSYS; 411 } 412 413 /* 414 * If we ever come here the user sp is bad. Zap the process right away. 415 * Due to the bad stack signaling wouldn't work. 416 */ 417 asmlinkage void bad_stack(void) 418 { 419 do_exit(SIGSEGV); 420 } 421 422 /* 423 * Do a system call from kernel instead of calling sys_execve so we 424 * end up with proper pt_regs. 425 */ 426 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 427 { 428 register unsigned long __a0 asm("$4") = (unsigned long) filename; 429 register unsigned long __a1 asm("$5") = (unsigned long) argv; 430 register unsigned long __a2 asm("$6") = (unsigned long) envp; 431 register unsigned long __a3 asm("$7"); 432 unsigned long __v0; 433 434 __asm__ volatile (" \n" 435 " .set noreorder \n" 436 " li $2, %5 # __NR_execve \n" 437 " syscall \n" 438 " move %0, $2 \n" 439 " .set reorder \n" 440 : "=&r" (__v0), "=r" (__a3) 441 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 442 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 443 "memory"); 444 445 if (__a3 == 0) 446 return __v0; 447 448 return -__v0; 449 } 450