1 /* 2 * Implementation of various system calls for Linux/PowerPC 3 * 4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 5 * 6 * Derived from "arch/i386/kernel/sys_i386.c" 7 * Adapted from the i386 version by Gary Thomas 8 * Modified by Cort Dougan (cort@cs.nmt.edu) 9 * and Paul Mackerras (paulus@cs.anu.edu.au). 10 * 11 * This file contains various random system calls that 12 * have a non-standard calling sequence on the Linux/PPC 13 * platform. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 * 20 */ 21 22 #include <linux/errno.h> 23 #include <linux/sched.h> 24 #include <linux/syscalls.h> 25 #include <linux/mm.h> 26 #include <linux/fs.h> 27 #include <linux/smp.h> 28 #include <linux/sem.h> 29 #include <linux/msg.h> 30 #include <linux/shm.h> 31 #include <linux/stat.h> 32 #include <linux/mman.h> 33 #include <linux/sys.h> 34 #include <linux/ipc.h> 35 #include <linux/utsname.h> 36 #include <linux/file.h> 37 #include <linux/init.h> 38 #include <linux/personality.h> 39 40 #include <asm/uaccess.h> 41 #include <asm/syscalls.h> 42 #include <asm/time.h> 43 #include <asm/unistd.h> 44 45 /* 46 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 47 * 48 * This is really horribly ugly. 49 */ 50 int sys_ipc(uint call, int first, unsigned long second, long third, 51 void __user *ptr, long fifth) 52 { 53 int version, ret; 54 55 version = call >> 16; /* hack for backward compatibility */ 56 call &= 0xffff; 57 58 ret = -ENOSYS; 59 switch (call) { 60 case SEMOP: 61 ret = sys_semtimedop(first, (struct sembuf __user *)ptr, 62 (unsigned)second, NULL); 63 break; 64 case SEMTIMEDOP: 65 ret = sys_semtimedop(first, (struct sembuf __user *)ptr, 66 (unsigned)second, 67 (const struct timespec __user *) fifth); 68 break; 69 case SEMGET: 70 ret = sys_semget (first, (int)second, third); 71 break; 72 case SEMCTL: { 73 union semun fourth; 74 75 ret = -EINVAL; 76 if (!ptr) 77 break; 78 if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr))) 79 break; 80 ret = sys_semctl(first, (int)second, third, fourth); 81 break; 82 } 83 case MSGSND: 84 ret = sys_msgsnd(first, (struct msgbuf __user *)ptr, 85 (size_t)second, third); 86 break; 87 case MSGRCV: 88 switch (version) { 89 case 0: { 90 struct ipc_kludge tmp; 91 92 ret = -EINVAL; 93 if (!ptr) 94 break; 95 if ((ret = copy_from_user(&tmp, 96 (struct ipc_kludge __user *) ptr, 97 sizeof (tmp)) ? -EFAULT : 0)) 98 break; 99 ret = sys_msgrcv(first, tmp.msgp, (size_t) second, 100 tmp.msgtyp, third); 101 break; 102 } 103 default: 104 ret = sys_msgrcv (first, (struct msgbuf __user *) ptr, 105 (size_t)second, fifth, third); 106 break; 107 } 108 break; 109 case MSGGET: 110 ret = sys_msgget((key_t)first, (int)second); 111 break; 112 case MSGCTL: 113 ret = sys_msgctl(first, (int)second, 114 (struct msqid_ds __user *)ptr); 115 break; 116 case SHMAT: { 117 ulong raddr; 118 ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr); 119 if (ret) 120 break; 121 ret = put_user(raddr, (ulong __user *) third); 122 break; 123 } 124 case SHMDT: 125 ret = sys_shmdt((char __user *)ptr); 126 break; 127 case SHMGET: 128 ret = sys_shmget(first, (size_t)second, third); 129 break; 130 case SHMCTL: 131 ret = sys_shmctl(first, (int)second, 132 (struct shmid_ds __user *)ptr); 133 break; 134 } 135 136 return ret; 137 } 138 139 /* 140 * sys_pipe() is the normal C calling standard for creating 141 * a pipe. It's not the way unix traditionally does this, though. 142 */ 143 int sys_pipe(int __user *fildes) 144 { 145 int fd[2]; 146 int error; 147 148 error = do_pipe(fd); 149 if (!error) { 150 if (copy_to_user(fildes, fd, 2*sizeof(int))) 151 error = -EFAULT; 152 } 153 return error; 154 } 155 156 static inline unsigned long do_mmap2(unsigned long addr, size_t len, 157 unsigned long prot, unsigned long flags, 158 unsigned long fd, unsigned long off, int shift) 159 { 160 struct file * file = NULL; 161 unsigned long ret = -EINVAL; 162 163 if (shift) { 164 if (off & ((1 << shift) - 1)) 165 goto out; 166 off >>= shift; 167 } 168 169 ret = -EBADF; 170 if (!(flags & MAP_ANONYMOUS)) { 171 if (!(file = fget(fd))) 172 goto out; 173 } 174 175 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 176 177 down_write(¤t->mm->mmap_sem); 178 ret = do_mmap_pgoff(file, addr, len, prot, flags, off); 179 up_write(¤t->mm->mmap_sem); 180 if (file) 181 fput(file); 182 out: 183 return ret; 184 } 185 186 unsigned long sys_mmap2(unsigned long addr, size_t len, 187 unsigned long prot, unsigned long flags, 188 unsigned long fd, unsigned long pgoff) 189 { 190 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 191 } 192 193 unsigned long sys_mmap(unsigned long addr, size_t len, 194 unsigned long prot, unsigned long flags, 195 unsigned long fd, off_t offset) 196 { 197 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 198 } 199 200 #ifdef CONFIG_PPC32 201 /* 202 * Due to some executables calling the wrong select we sometimes 203 * get wrong args. This determines how the args are being passed 204 * (a single ptr to them all args passed) then calls 205 * sys_select() with the appropriate args. -- Cort 206 */ 207 int 208 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 209 { 210 if ( (unsigned long)n >= 4096 ) 211 { 212 unsigned long __user *buffer = (unsigned long __user *)n; 213 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 214 || __get_user(n, buffer) 215 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 216 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 217 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 218 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 219 return -EFAULT; 220 } 221 return sys_select(n, inp, outp, exp, tvp); 222 } 223 #endif 224 225 #ifdef CONFIG_PPC64 226 long ppc64_personality(unsigned long personality) 227 { 228 long ret; 229 230 if (personality(current->personality) == PER_LINUX32 231 && personality == PER_LINUX) 232 personality = PER_LINUX32; 233 ret = sys_personality(personality); 234 if (ret == PER_LINUX32) 235 ret = PER_LINUX; 236 return ret; 237 } 238 #endif 239 240 #ifdef CONFIG_PPC64 241 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32) 242 #else 243 #define OVERRIDE_MACHINE 0 244 #endif 245 246 static inline int override_machine(char __user *mach) 247 { 248 if (OVERRIDE_MACHINE) { 249 /* change ppc64 to ppc */ 250 if (__put_user(0, mach+3) || __put_user(0, mach+4)) 251 return -EFAULT; 252 } 253 return 0; 254 } 255 256 long ppc_newuname(struct new_utsname __user * name) 257 { 258 int err = 0; 259 260 down_read(&uts_sem); 261 if (copy_to_user(name, utsname(), sizeof(*name))) 262 err = -EFAULT; 263 up_read(&uts_sem); 264 if (!err) 265 err = override_machine(name->machine); 266 return err; 267 } 268 269 int sys_uname(struct old_utsname __user *name) 270 { 271 int err = 0; 272 273 down_read(&uts_sem); 274 if (copy_to_user(name, utsname(), sizeof(*name))) 275 err = -EFAULT; 276 up_read(&uts_sem); 277 if (!err) 278 err = override_machine(name->machine); 279 return err; 280 } 281 282 int sys_olduname(struct oldold_utsname __user *name) 283 { 284 int error; 285 286 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 287 return -EFAULT; 288 289 down_read(&uts_sem); 290 error = __copy_to_user(&name->sysname, &utsname()->sysname, 291 __OLD_UTS_LEN); 292 error |= __put_user(0, name->sysname + __OLD_UTS_LEN); 293 error |= __copy_to_user(&name->nodename, &utsname()->nodename, 294 __OLD_UTS_LEN); 295 error |= __put_user(0, name->nodename + __OLD_UTS_LEN); 296 error |= __copy_to_user(&name->release, &utsname()->release, 297 __OLD_UTS_LEN); 298 error |= __put_user(0, name->release + __OLD_UTS_LEN); 299 error |= __copy_to_user(&name->version, &utsname()->version, 300 __OLD_UTS_LEN); 301 error |= __put_user(0, name->version + __OLD_UTS_LEN); 302 error |= __copy_to_user(&name->machine, &utsname()->machine, 303 __OLD_UTS_LEN); 304 error |= override_machine(name->machine); 305 up_read(&uts_sem); 306 307 return error? -EFAULT: 0; 308 } 309 310 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 311 u32 len_high, u32 len_low) 312 { 313 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, 314 (u64)len_high << 32 | len_low, advice); 315 } 316 317 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5, 318 unsigned long r6, unsigned long r7, unsigned long r8, 319 struct pt_regs *regs) 320 { 321 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p" 322 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs, 323 current, smp_processor_id()); 324 } 325 326 void do_show_syscall_exit(unsigned long r3) 327 { 328 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id()); 329 } 330