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/capability.h> 11 #include <linux/errno.h> 12 #include <linux/linkage.h> 13 #include <linux/mm.h> 14 #include <linux/fs.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/utsname.h> 23 #include <linux/unistd.h> 24 #include <linux/sem.h> 25 #include <linux/msg.h> 26 #include <linux/shm.h> 27 #include <linux/compiler.h> 28 #include <linux/module.h> 29 #include <linux/ipc.h> 30 #include <linux/uaccess.h> 31 #include <linux/slab.h> 32 33 #include <asm/asm.h> 34 #include <asm/branch.h> 35 #include <asm/cachectl.h> 36 #include <asm/cacheflush.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 /* 45 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling 46 * convention. It returns results in registers $v0 / $v1 which means there 47 * is no need for it to do verify the validity of a userspace pointer 48 * argument. Historically that used to be expensive in Linux. These days 49 * the performance advantage is negligible. 50 */ 51 asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs) 52 { 53 int fd[2]; 54 int error, res; 55 56 error = do_pipe_flags(fd, 0); 57 if (error) { 58 res = error; 59 goto out; 60 } 61 regs.regs[3] = fd[1]; 62 res = fd[0]; 63 out: 64 return res; 65 } 66 67 unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ 68 69 EXPORT_SYMBOL(shm_align_mask); 70 71 #define COLOUR_ALIGN(addr,pgoff) \ 72 ((((addr) + shm_align_mask) & ~shm_align_mask) + \ 73 (((pgoff) << PAGE_SHIFT) & shm_align_mask)) 74 75 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, 76 unsigned long len, unsigned long pgoff, unsigned long flags) 77 { 78 struct vm_area_struct * vmm; 79 int do_color_align; 80 unsigned long task_size; 81 82 task_size = STACK_TOP; 83 84 if (len > task_size) 85 return -ENOMEM; 86 87 if (flags & MAP_FIXED) { 88 /* Even MAP_FIXED mappings must reside within task_size. */ 89 if (task_size - len < addr) 90 return -EINVAL; 91 92 /* 93 * We do not accept a shared mapping if it would violate 94 * cache aliasing constraints. 95 */ 96 if ((flags & MAP_SHARED) && 97 ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask)) 98 return -EINVAL; 99 return addr; 100 } 101 102 do_color_align = 0; 103 if (filp || (flags & MAP_SHARED)) 104 do_color_align = 1; 105 if (addr) { 106 if (do_color_align) 107 addr = COLOUR_ALIGN(addr, pgoff); 108 else 109 addr = PAGE_ALIGN(addr); 110 vmm = find_vma(current->mm, addr); 111 if (task_size - len >= addr && 112 (!vmm || addr + len <= vmm->vm_start)) 113 return addr; 114 } 115 addr = TASK_UNMAPPED_BASE; 116 if (do_color_align) 117 addr = COLOUR_ALIGN(addr, pgoff); 118 else 119 addr = PAGE_ALIGN(addr); 120 121 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { 122 /* At this point: (!vmm || addr < vmm->vm_end). */ 123 if (task_size - len < addr) 124 return -ENOMEM; 125 if (!vmm || addr + len <= vmm->vm_start) 126 return addr; 127 addr = vmm->vm_end; 128 if (do_color_align) 129 addr = COLOUR_ALIGN(addr, pgoff); 130 } 131 } 132 133 SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, 134 unsigned long, prot, unsigned long, flags, unsigned long, 135 fd, off_t, offset) 136 { 137 unsigned long result; 138 139 result = -EINVAL; 140 if (offset & ~PAGE_MASK) 141 goto out; 142 143 result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); 144 145 out: 146 return result; 147 } 148 149 SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, 150 unsigned long, prot, unsigned long, flags, unsigned long, fd, 151 unsigned long, pgoff) 152 { 153 if (pgoff & (~PAGE_MASK >> 12)) 154 return -EINVAL; 155 156 return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); 157 } 158 159 save_static_function(sys_fork); 160 static int __used noinline 161 _sys_fork(nabi_no_regargs struct pt_regs regs) 162 { 163 return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); 164 } 165 166 save_static_function(sys_clone); 167 static int __used noinline 168 _sys_clone(nabi_no_regargs struct pt_regs regs) 169 { 170 unsigned long clone_flags; 171 unsigned long newsp; 172 int __user *parent_tidptr, *child_tidptr; 173 174 clone_flags = regs.regs[4]; 175 newsp = regs.regs[5]; 176 if (!newsp) 177 newsp = regs.regs[29]; 178 parent_tidptr = (int __user *) regs.regs[6]; 179 #ifdef CONFIG_32BIT 180 /* We need to fetch the fifth argument off the stack. */ 181 child_tidptr = NULL; 182 if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { 183 int __user *__user *usp = (int __user *__user *) regs.regs[29]; 184 if (regs.regs[2] == __NR_syscall) { 185 if (get_user (child_tidptr, &usp[5])) 186 return -EFAULT; 187 } 188 else if (get_user (child_tidptr, &usp[4])) 189 return -EFAULT; 190 } 191 #else 192 child_tidptr = (int __user *) regs.regs[8]; 193 #endif 194 return do_fork(clone_flags, newsp, ®s, 0, 195 parent_tidptr, child_tidptr); 196 } 197 198 /* 199 * sys_execve() executes a new program. 200 */ 201 asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) 202 { 203 int error; 204 char * filename; 205 206 filename = getname((char __user *) (long)regs.regs[4]); 207 error = PTR_ERR(filename); 208 if (IS_ERR(filename)) 209 goto out; 210 error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], 211 (char __user *__user *) (long)regs.regs[6], ®s); 212 putname(filename); 213 214 out: 215 return error; 216 } 217 218 SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) 219 { 220 struct thread_info *ti = task_thread_info(current); 221 222 ti->tp_value = addr; 223 if (cpu_has_userlocal) 224 write_c0_userlocal(addr); 225 226 return 0; 227 } 228 229 static inline int mips_atomic_set(struct pt_regs *regs, 230 unsigned long addr, unsigned long new) 231 { 232 unsigned long old, tmp; 233 unsigned int err; 234 235 if (unlikely(addr & 3)) 236 return -EINVAL; 237 238 if (unlikely(!access_ok(VERIFY_WRITE, addr, 4))) 239 return -EINVAL; 240 241 if (cpu_has_llsc && R10000_LLSC_WAR) { 242 __asm__ __volatile__ ( 243 " .set mips3 \n" 244 " li %[err], 0 \n" 245 "1: ll %[old], (%[addr]) \n" 246 " move %[tmp], %[new] \n" 247 "2: sc %[tmp], (%[addr]) \n" 248 " beqzl %[tmp], 1b \n" 249 "3: \n" 250 " .section .fixup,\"ax\" \n" 251 "4: li %[err], %[efault] \n" 252 " j 3b \n" 253 " .previous \n" 254 " .section __ex_table,\"a\" \n" 255 " "STR(PTR)" 1b, 4b \n" 256 " "STR(PTR)" 2b, 4b \n" 257 " .previous \n" 258 " .set mips0 \n" 259 : [old] "=&r" (old), 260 [err] "=&r" (err), 261 [tmp] "=&r" (tmp) 262 : [addr] "r" (addr), 263 [new] "r" (new), 264 [efault] "i" (-EFAULT) 265 : "memory"); 266 } else if (cpu_has_llsc) { 267 __asm__ __volatile__ ( 268 " .set mips3 \n" 269 " li %[err], 0 \n" 270 "1: ll %[old], (%[addr]) \n" 271 " move %[tmp], %[new] \n" 272 "2: sc %[tmp], (%[addr]) \n" 273 " bnez %[tmp], 4f \n" 274 "3: \n" 275 " .subsection 2 \n" 276 "4: b 1b \n" 277 " .previous \n" 278 " \n" 279 " .section .fixup,\"ax\" \n" 280 "5: li %[err], %[efault] \n" 281 " j 3b \n" 282 " .previous \n" 283 " .section __ex_table,\"a\" \n" 284 " "STR(PTR)" 1b, 5b \n" 285 " "STR(PTR)" 2b, 5b \n" 286 " .previous \n" 287 " .set mips0 \n" 288 : [old] "=&r" (old), 289 [err] "=&r" (err), 290 [tmp] "=&r" (tmp) 291 : [addr] "r" (addr), 292 [new] "r" (new), 293 [efault] "i" (-EFAULT) 294 : "memory"); 295 } else { 296 do { 297 preempt_disable(); 298 ll_bit = 1; 299 ll_task = current; 300 preempt_enable(); 301 302 err = __get_user(old, (unsigned int *) addr); 303 err |= __put_user(new, (unsigned int *) addr); 304 if (err) 305 break; 306 rmb(); 307 } while (!ll_bit); 308 } 309 310 if (unlikely(err)) 311 return err; 312 313 regs->regs[2] = old; 314 regs->regs[7] = 0; /* No error */ 315 316 /* 317 * Don't let your children do this ... 318 */ 319 __asm__ __volatile__( 320 " move $29, %0 \n" 321 " j syscall_exit \n" 322 : /* no outputs */ 323 : "r" (regs)); 324 325 /* unreached. Honestly. */ 326 while (1); 327 } 328 329 save_static_function(sys_sysmips); 330 static int __used noinline 331 _sys_sysmips(nabi_no_regargs struct pt_regs regs) 332 { 333 long cmd, arg1, arg2, arg3; 334 335 cmd = regs.regs[4]; 336 arg1 = regs.regs[5]; 337 arg2 = regs.regs[6]; 338 arg3 = regs.regs[7]; 339 340 switch (cmd) { 341 case MIPS_ATOMIC_SET: 342 return mips_atomic_set(®s, arg1, arg2); 343 344 case MIPS_FIXADE: 345 if (arg1 & ~3) 346 return -EINVAL; 347 348 if (arg1 & 1) 349 set_thread_flag(TIF_FIXADE); 350 else 351 clear_thread_flag(TIF_FIXADE); 352 if (arg1 & 2) 353 set_thread_flag(TIF_LOGADE); 354 else 355 clear_thread_flag(TIF_FIXADE); 356 357 return 0; 358 359 case FLUSH_CACHE: 360 __flush_cache_all(); 361 return 0; 362 } 363 364 return -EINVAL; 365 } 366 367 /* 368 * No implemented yet ... 369 */ 370 SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) 371 { 372 return -ENOSYS; 373 } 374 375 /* 376 * If we ever come here the user sp is bad. Zap the process right away. 377 * Due to the bad stack signaling wouldn't work. 378 */ 379 asmlinkage void bad_stack(void) 380 { 381 do_exit(SIGSEGV); 382 } 383 384 /* 385 * Do a system call from kernel instead of calling sys_execve so we 386 * end up with proper pt_regs. 387 */ 388 int kernel_execve(const char *filename, char *const argv[], char *const envp[]) 389 { 390 register unsigned long __a0 asm("$4") = (unsigned long) filename; 391 register unsigned long __a1 asm("$5") = (unsigned long) argv; 392 register unsigned long __a2 asm("$6") = (unsigned long) envp; 393 register unsigned long __a3 asm("$7"); 394 unsigned long __v0; 395 396 __asm__ volatile (" \n" 397 " .set noreorder \n" 398 " li $2, %5 # __NR_execve \n" 399 " syscall \n" 400 " move %0, $2 \n" 401 " .set reorder \n" 402 : "=&r" (__v0), "=r" (__a3) 403 : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) 404 : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", 405 "memory"); 406 407 if (__a3 == 0) 408 return __v0; 409 410 return -__v0; 411 } 412