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 int tmp; 285 286 switch(cmd) { 287 case MIPS_ATOMIC_SET: 288 printk(KERN_CRIT "How did I get here?\n"); 289 return -EINVAL; 290 291 case MIPS_FIXADE: 292 tmp = current->thread.mflags & ~3; 293 current->thread.mflags = tmp | (arg1 & 3); 294 return 0; 295 296 case FLUSH_CACHE: 297 __flush_cache_all(); 298 return 0; 299 } 300 301 return -EINVAL; 302 } 303 304 /* 305 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 306 * 307 * This is really horribly ugly. 308 */ 309 asmlinkage int sys_ipc (unsigned int call, int first, int second, 310 unsigned long third, void __user *ptr, long fifth) 311 { 312 int version, ret; 313 314 version = call >> 16; /* hack for backward compatibility */ 315 call &= 0xffff; 316 317 switch (call) { 318 case SEMOP: 319 return sys_semtimedop (first, (struct sembuf __user *)ptr, 320 second, NULL); 321 case SEMTIMEDOP: 322 return sys_semtimedop (first, (struct sembuf __user *)ptr, 323 second, 324 (const struct timespec __user *)fifth); 325 case SEMGET: 326 return sys_semget (first, second, third); 327 case SEMCTL: { 328 union semun fourth; 329 if (!ptr) 330 return -EINVAL; 331 if (get_user(fourth.__pad, (void __user *__user *) ptr)) 332 return -EFAULT; 333 return sys_semctl (first, second, third, fourth); 334 } 335 336 case MSGSND: 337 return sys_msgsnd (first, (struct msgbuf __user *) ptr, 338 second, third); 339 case MSGRCV: 340 switch (version) { 341 case 0: { 342 struct ipc_kludge tmp; 343 if (!ptr) 344 return -EINVAL; 345 346 if (copy_from_user(&tmp, 347 (struct ipc_kludge __user *) ptr, 348 sizeof (tmp))) 349 return -EFAULT; 350 return sys_msgrcv (first, tmp.msgp, second, 351 tmp.msgtyp, third); 352 } 353 default: 354 return sys_msgrcv (first, 355 (struct msgbuf __user *) ptr, 356 second, fifth, third); 357 } 358 case MSGGET: 359 return sys_msgget ((key_t) first, second); 360 case MSGCTL: 361 return sys_msgctl (first, second, 362 (struct msqid_ds __user *) ptr); 363 364 case SHMAT: 365 switch (version) { 366 default: { 367 unsigned long raddr; 368 ret = do_shmat (first, (char __user *) ptr, second, 369 &raddr); 370 if (ret) 371 return ret; 372 return put_user (raddr, (unsigned long __user *) third); 373 } 374 case 1: /* iBCS2 emulator entry point */ 375 if (!segment_eq(get_fs(), get_ds())) 376 return -EINVAL; 377 return do_shmat (first, (char __user *) ptr, second, 378 (unsigned long *) third); 379 } 380 case SHMDT: 381 return sys_shmdt ((char __user *)ptr); 382 case SHMGET: 383 return sys_shmget (first, second, third); 384 case SHMCTL: 385 return sys_shmctl (first, second, 386 (struct shmid_ds __user *) ptr); 387 default: 388 return -ENOSYS; 389 } 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 } 408 409 /* 410 * Do a system call from kernel instead of calling sys_execve so we 411 * end up with proper pt_regs. 412 */ 413 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 414 { 415 register unsigned long __a0 asm("$4") = (unsigned long) filename; 416 register unsigned long __a1 asm("$5") = (unsigned long) argv; 417 register unsigned long __a2 asm("$6") = (unsigned long) envp; 418 register unsigned long __a3 asm("$7"); 419 unsigned long __v0; 420 421 __asm__ volatile (" \n" 422 " .set noreorder \n" 423 " li $2, %5 # __NR_execve \n" 424 " syscall \n" 425 " move %0, $2 \n" 426 " .set reorder \n" 427 : "=&r" (__v0), "=r" (__a3) 428 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 429 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 430 "memory"); 431 432 if (__a3 == 0) 433 return __v0; 434 435 return -__v0; 436 } 437