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