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/smp.h> 16#include <linux/mman.h> 17#include <linux/ptrace.h> 18#include <linux/sched.h> 19#include <linux/string.h> 20#include <linux/syscalls.h> 21#include <linux/file.h> 22#include <linux/slab.h> 23#include <linux/utsname.h> 24#include <linux/unistd.h> 25#include <linux/sem.h> 26#include <linux/msg.h> 27#include <linux/shm.h> 28#include <linux/compiler.h> 29#include <linux/module.h> 30 31#include <asm/branch.h> 32#include <asm/cachectl.h> 33#include <asm/cacheflush.h> 34#include <asm/ipc.h> 35#include <asm/asm-offsets.h> 36#include <asm/signal.h> 37#include <asm/sim.h> 38#include <asm/shmparam.h> 39#include <asm/sysmips.h> 40#include <asm/uaccess.h> 41 42asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs) 43{ 44 int fd[2]; 45 int error, res; 46 47 error = do_pipe(fd); 48 if (error) { 49 res = error; 50 goto out; 51 } 52 regs.regs[3] = fd[1]; 53 res = fd[0]; 54out: 55 return res; 56} 57 58unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 59 60EXPORT_SYMBOL(shm_align_mask); 61 62#define COLOUR_ALIGN(addr,pgoff) \ 63 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 64 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 65 66unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 67 unsigned long len, unsigned long pgoff, unsigned long flags) 68{ 69 struct vm_area_struct * vmm; 70 int do_color_align; 71 unsigned long task_size; 72 73 task_size = STACK_TOP; 74 75 if (flags & MAP_FIXED) { 76 /* 77 * We do not accept a shared mapping if it would violate 78 * cache aliasing constraints. 79 */ 80 if ((flags & MAP_SHARED) && (addr & shm_align_mask)) 81 return -EINVAL; 82 return addr; 83 } 84 85 if (len > task_size) 86 return -ENOMEM; 87 do_color_align = 0; 88 if (filp || (flags & MAP_SHARED)) 89 do_color_align = 1; 90 if (addr) { 91 if (do_color_align) 92 addr = COLOUR_ALIGN(addr, pgoff); 93 else 94 addr = PAGE_ALIGN(addr); 95 vmm = find_vma(current->mm, addr); 96 if (task_size - len >= addr && 97 (!vmm || addr + len <= vmm->vm_start)) 98 return addr; 99 } 100 addr = TASK_UNMAPPED_BASE; 101 if (do_color_align) 102 addr = COLOUR_ALIGN(addr, pgoff); 103 else 104 addr = PAGE_ALIGN(addr); 105 106 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 107 /* At this point: (!vmm || addr < vmm->vm_end). */ 108 if (task_size - len < addr) 109 return -ENOMEM; 110 if (!vmm || addr + len <= vmm->vm_start) 111 return addr; 112 addr = vmm->vm_end; 113 if (do_color_align) 114 addr = COLOUR_ALIGN(addr, pgoff); 115 } 116} 117 118/* common code for old and new mmaps */ 119static inline unsigned long 120do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 121 unsigned long flags, unsigned long fd, unsigned long pgoff) 122{ 123 unsigned long error = -EBADF; 124 struct file * file = NULL; 125 126 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 127 if (!(flags & MAP_ANONYMOUS)) { 128 file = fget(fd); 129 if (!file) 130 goto out; 131 } 132 133 down_write(¤t->mm->mmap_sem); 134 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 135 up_write(¤t->mm->mmap_sem); 136 137 if (file) 138 fput(file); 139out: 140 return error; 141} 142 143asmlinkage unsigned long 144old_mmap(unsigned long addr, unsigned long len, int prot, 145 int flags, int fd, off_t offset) 146{ 147 unsigned long result; 148 149 result = -EINVAL; 150 if (offset & ~PAGE_MASK) 151 goto out; 152 153 result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 154 155out: 156 return result; 157} 158 159asmlinkage unsigned long 160sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 161 unsigned long flags, unsigned long fd, unsigned long pgoff) 162{ 163 if (pgoff & (~PAGE_MASK >> 12)) 164 return -EINVAL; 165 166 return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 167} 168 169save_static_function(sys_fork); 170__attribute_used__ noinline static int 171_sys_fork(nabi_no_regargs struct pt_regs regs) 172{ 173 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 174} 175 176save_static_function(sys_clone); 177__attribute_used__ noinline static int 178_sys_clone(nabi_no_regargs struct pt_regs regs) 179{ 180 unsigned long clone_flags; 181 unsigned long newsp; 182 int __user *parent_tidptr, *child_tidptr; 183 184 clone_flags = regs.regs[4]; 185 newsp = regs.regs[5]; 186 if (!newsp) 187 newsp = regs.regs[29]; 188 parent_tidptr = (int __user *) regs.regs[6]; 189#ifdef CONFIG_32BIT 190 /* We need to fetch the fifth argument off the stack. */ 191 child_tidptr = NULL; 192 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 193 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 194 if (regs.regs[2] == __NR_syscall) { 195 if (get_user (child_tidptr, &usp[5])) 196 return -EFAULT; 197 } 198 else if (get_user (child_tidptr, &usp[4])) 199 return -EFAULT; 200 } 201#else 202 child_tidptr = (int __user *) regs.regs[8]; 203#endif 204 return do_fork(clone_flags, newsp, ®s, 0, 205 parent_tidptr, child_tidptr); 206} 207 208/* 209 * sys_execve() executes a new program. 210 */ 211asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 212{ 213 int error; 214 char * filename; 215 216 filename = getname((char __user *) (long)regs.regs[4]); 217 error = PTR_ERR(filename); 218 if (IS_ERR(filename)) 219 goto out; 220 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 221 (char __user *__user *) (long)regs.regs[6], ®s); 222 putname(filename); 223 224out: 225 return error; 226} 227 228/* 229 * Compacrapability ... 230 */ 231asmlinkage int sys_uname(struct old_utsname __user * name) 232{ 233 if (name && !copy_to_user(name, utsname(), sizeof (*name))) 234 return 0; 235 return -EFAULT; 236} 237 238/* 239 * Compacrapability ... 240 */ 241asmlinkage int sys_olduname(struct oldold_utsname __user * name) 242{ 243 int error; 244 245 if (!name) 246 return -EFAULT; 247 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) 248 return -EFAULT; 249 250 error = __copy_to_user(&name->sysname, &utsname()->sysname, 251 __OLD_UTS_LEN); 252 error -= __put_user(0, name->sysname + __OLD_UTS_LEN); 253 error -= __copy_to_user(&name->nodename, &utsname()->nodename, 254 __OLD_UTS_LEN); 255 error -= __put_user(0, name->nodename + __OLD_UTS_LEN); 256 error -= __copy_to_user(&name->release, &utsname()->release, 257 __OLD_UTS_LEN); 258 error -= __put_user(0, name->release + __OLD_UTS_LEN); 259 error -= __copy_to_user(&name->version, &utsname()->version, 260 __OLD_UTS_LEN); 261 error -= __put_user(0, name->version + __OLD_UTS_LEN); 262 error -= __copy_to_user(&name->machine, &utsname()->machine, 263 __OLD_UTS_LEN); 264 error = __put_user(0, name->machine + __OLD_UTS_LEN); 265 error = error ? -EFAULT : 0; 266 267 return error; 268} 269 270asmlinkage int sys_set_thread_area(unsigned long addr) 271{ 272 struct thread_info *ti = task_thread_info(current); 273 274 ti->tp_value = addr; 275 276 /* If some future MIPS implementation has this register in hardware, 277 * we will need to update it here (and in context switches). */ 278 279 return 0; 280} 281 282asmlinkage 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 */ 309asmlinkage 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 */ 395asmlinkage 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 */ 404asmlinkage 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 */ 413int 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} 437 438/* 439 * Build the string table for the builtin "poor man's strace". 440 */ 441#ifdef CONFIG_PRINT_SYSCALLS 442#define SYS(fun, narg) #fun, 443static char *sfnames[] = { 444#include "syscalls.h" 445}; 446 447#ifdef CONFIG_HWSIM 448int do_strace = 1; 449#else 450int do_strace = 0; 451#endif 452 453asmlinkage void strace(struct pt_regs *regs) 454{ 455 int i; 456 unsigned long scn, narg, *pa0; 457 char *name, space[16]; 458 extern char sys_call_table[]; 459 460 if (do_strace == 0) 461 return; 462 463 scn = regs->regs[2]; 464 pa0 = ®s->regs[4]; 465 466 if ((scn >= __NR_Linux) && (scn < (__NR_Linux + __NR_Linux_syscalls))) { 467 name = sfnames[scn - __NR_Linux]; 468 narg = *(unsigned long *)(((char *)(&sys_call_table[scn])) + 4); 469 } else { 470 sprintf(space, "sc%lu", scn); 471 name = space; 472 narg = 0; 473 } 474 475 printk("%lu[%s:%d]@0x%08lx: %s(", jiffies, current->comm, current->pid, regs->cp0_epc, name); 476 477 if (narg > 6) narg = 6; 478 479 for (i = 0; i < narg; i++) { 480 if (i) printk(", "); 481 if (i < 4) 482 printk("0x%08lx", pa0[i]); 483 else 484 printk("0x%08lx", regs->pad0[i]); 485 } 486 487 printk(")\n"); 488} 489#endif 490