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 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 if (pgoff & (~PAGE_MASK >> 12)) 165 return -EINVAL; 166 167 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 168 } 169 170 save_static_function(sys_fork); 171 static int __used noinline 172 _sys_fork(nabi_no_regargs struct pt_regs regs) 173 { 174 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 175 } 176 177 save_static_function(sys_clone); 178 static int __used noinline 179 _sys_clone(nabi_no_regargs struct pt_regs regs) 180 { 181 unsigned long clone_flags; 182 unsigned long newsp; 183 int __user *parent_tidptr, *child_tidptr; 184 185 clone_flags = regs.regs[4]; 186 newsp = regs.regs[5]; 187 if (!newsp) 188 newsp = regs.regs[29]; 189 parent_tidptr = (int __user *) regs.regs[6]; 190 #ifdef CONFIG_32BIT 191 /* We need to fetch the fifth argument off the stack. */ 192 child_tidptr = NULL; 193 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 194 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 195 if (regs.regs[2] == __NR_syscall) { 196 if (get_user (child_tidptr, &usp[5])) 197 return -EFAULT; 198 } 199 else if (get_user (child_tidptr, &usp[4])) 200 return -EFAULT; 201 } 202 #else 203 child_tidptr = (int __user *) regs.regs[8]; 204 #endif 205 return do_fork(clone_flags, newsp, ®s, 0, 206 parent_tidptr, child_tidptr); 207 } 208 209 /* 210 * sys_execve() executes a new program. 211 */ 212 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 213 { 214 int error; 215 char * filename; 216 217 filename = getname((char __user *) (long)regs.regs[4]); 218 error = PTR_ERR(filename); 219 if (IS_ERR(filename)) 220 goto out; 221 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 222 (char __user *__user *) (long)regs.regs[6], ®s); 223 putname(filename); 224 225 out: 226 return error; 227 } 228 229 /* 230 * Compacrapability ... 231 */ 232 asmlinkage int sys_uname(struct old_utsname __user * name) 233 { 234 if (name && !copy_to_user(name, utsname(), sizeof (*name))) 235 return 0; 236 return -EFAULT; 237 } 238 239 /* 240 * Compacrapability ... 241 */ 242 asmlinkage int sys_olduname(struct oldold_utsname __user * name) 243 { 244 int error; 245 246 if (!name) 247 return -EFAULT; 248 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 249 return -EFAULT; 250 251 error = __copy_to_user(&name->sysname, &utsname()->sysname, 252 __OLD_UTS_LEN); 253 error -= __put_user(0, name->sysname + __OLD_UTS_LEN); 254 error -= __copy_to_user(&name->nodename, &utsname()->nodename, 255 __OLD_UTS_LEN); 256 error -= __put_user(0, name->nodename + __OLD_UTS_LEN); 257 error -= __copy_to_user(&name->release, &utsname()->release, 258 __OLD_UTS_LEN); 259 error -= __put_user(0, name->release + __OLD_UTS_LEN); 260 error -= __copy_to_user(&name->version, &utsname()->version, 261 __OLD_UTS_LEN); 262 error -= __put_user(0, name->version + __OLD_UTS_LEN); 263 error -= __copy_to_user(&name->machine, &utsname()->machine, 264 __OLD_UTS_LEN); 265 error = __put_user(0, name->machine + __OLD_UTS_LEN); 266 error = error ? -EFAULT : 0; 267 268 return error; 269 } 270 271 asmlinkage int sys_set_thread_area(unsigned long addr) 272 { 273 struct thread_info *ti = task_thread_info(current); 274 275 ti->tp_value = addr; 276 if (cpu_has_userlocal) 277 write_c0_userlocal(addr); 278 279 return 0; 280 } 281 282 asmlinkage int _sys_sysmips(int cmd, long arg1, int arg2, int arg3) 283 { 284 switch (cmd) { 285 case MIPS_ATOMIC_SET: 286 printk(KERN_CRIT "How did I get here?\n"); 287 return -EINVAL; 288 289 case MIPS_FIXADE: 290 if (arg1 & ~3) 291 return -EINVAL; 292 293 if (arg1 & 1) 294 set_thread_flag(TIF_FIXADE); 295 else 296 clear_thread_flag(TIF_FIXADE); 297 if (arg1 & 2) 298 set_thread_flag(TIF_LOGADE); 299 else 300 clear_thread_flag(TIF_FIXADE); 301 302 return 0; 303 304 case FLUSH_CACHE: 305 __flush_cache_all(); 306 return 0; 307 } 308 309 return -EINVAL; 310 } 311 312 /* 313 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 314 * 315 * This is really horribly ugly. 316 */ 317 asmlinkage int sys_ipc(unsigned int call, int first, int second, 318 unsigned long third, void __user *ptr, long fifth) 319 { 320 int version, ret; 321 322 version = call >> 16; /* hack for backward compatibility */ 323 call &= 0xffff; 324 325 switch (call) { 326 case SEMOP: 327 return sys_semtimedop(first, (struct sembuf __user *)ptr, 328 second, NULL); 329 case SEMTIMEDOP: 330 return sys_semtimedop(first, (struct sembuf __user *)ptr, 331 second, 332 (const struct timespec __user *)fifth); 333 case SEMGET: 334 return sys_semget(first, second, third); 335 case SEMCTL: { 336 union semun fourth; 337 if (!ptr) 338 return -EINVAL; 339 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 340 return -EFAULT; 341 return sys_semctl(first, second, third, fourth); 342 } 343 344 case MSGSND: 345 return sys_msgsnd(first, (struct msgbuf __user *) ptr, 346 second, third); 347 case MSGRCV: 348 switch (version) { 349 case 0: { 350 struct ipc_kludge tmp; 351 if (!ptr) 352 return -EINVAL; 353 354 if (copy_from_user(&tmp, 355 (struct ipc_kludge __user *) ptr, 356 sizeof(tmp))) 357 return -EFAULT; 358 return sys_msgrcv(first, tmp.msgp, second, 359 tmp.msgtyp, third); 360 } 361 default: 362 return sys_msgrcv(first, 363 (struct msgbuf __user *) ptr, 364 second, fifth, third); 365 } 366 case MSGGET: 367 return sys_msgget((key_t) first, second); 368 case MSGCTL: 369 return sys_msgctl(first, second, 370 (struct msqid_ds __user *) ptr); 371 372 case SHMAT: 373 switch (version) { 374 default: { 375 unsigned long raddr; 376 ret = do_shmat(first, (char __user *) ptr, second, 377 &raddr); 378 if (ret) 379 return ret; 380 return put_user(raddr, (unsigned long __user *) third); 381 } 382 case 1: /* iBCS2 emulator entry point */ 383 if (!segment_eq(get_fs(), get_ds())) 384 return -EINVAL; 385 return do_shmat(first, (char __user *) ptr, second, 386 (unsigned long *) third); 387 } 388 case SHMDT: 389 return sys_shmdt((char __user *)ptr); 390 case SHMGET: 391 return sys_shmget(first, second, third); 392 case SHMCTL: 393 return sys_shmctl(first, second, 394 (struct shmid_ds __user *) ptr); 395 default: 396 return -ENOSYS; 397 } 398 } 399 400 /* 401 * No implemented yet ... 402 */ 403 asmlinkage int sys_cachectl(char *addr, int nbytes, int op) 404 { 405 return -ENOSYS; 406 } 407 408 /* 409 * If we ever come here the user sp is bad. Zap the process right away. 410 * Due to the bad stack signaling wouldn't work. 411 */ 412 asmlinkage void bad_stack(void) 413 { 414 do_exit(SIGSEGV); 415 } 416 417 /* 418 * Do a system call from kernel instead of calling sys_execve so we 419 * end up with proper pt_regs. 420 */ 421 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 422 { 423 register unsigned long __a0 asm("$4") = (unsigned long) filename; 424 register unsigned long __a1 asm("$5") = (unsigned long) argv; 425 register unsigned long __a2 asm("$6") = (unsigned long) envp; 426 register unsigned long __a3 asm("$7"); 427 unsigned long __v0; 428 429 __asm__ volatile (" \n" 430 " .set noreorder \n" 431 " li $2, %5 # __NR_execve \n" 432 " syscall \n" 433 " move %0, $2 \n" 434 " .set reorder \n" 435 : "=&r" (__v0), "=r" (__a3) 436 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 437 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 438 "memory"); 439 440 if (__a3 == 0) 441 return __v0; 442 443 return -__v0; 444 } 445