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 static inline unsigned long do_mmap2(unsigned long addr, size_t len, 140 unsigned long prot, unsigned long flags, 141 unsigned long fd, unsigned long off, int shift) 142 { 143 struct file * file = NULL; 144 unsigned long ret = -EINVAL; 145 146 if (!arch_validate_prot(prot)) 147 goto out; 148 149 if (shift) { 150 if (off & ((1 << shift) - 1)) 151 goto out; 152 off >>= shift; 153 } 154 155 ret = -EBADF; 156 if (!(flags & MAP_ANONYMOUS)) { 157 if (!(file = fget(fd))) 158 goto out; 159 } 160 161 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 162 163 down_write(¤t->mm->mmap_sem); 164 ret = do_mmap_pgoff(file, addr, len, prot, flags, off); 165 up_write(¤t->mm->mmap_sem); 166 if (file) 167 fput(file); 168 out: 169 return ret; 170 } 171 172 unsigned long sys_mmap2(unsigned long addr, size_t len, 173 unsigned long prot, unsigned long flags, 174 unsigned long fd, unsigned long pgoff) 175 { 176 return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12); 177 } 178 179 unsigned long sys_mmap(unsigned long addr, size_t len, 180 unsigned long prot, unsigned long flags, 181 unsigned long fd, off_t offset) 182 { 183 return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT); 184 } 185 186 #ifdef CONFIG_PPC32 187 /* 188 * Due to some executables calling the wrong select we sometimes 189 * get wrong args. This determines how the args are being passed 190 * (a single ptr to them all args passed) then calls 191 * sys_select() with the appropriate args. -- Cort 192 */ 193 int 194 ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp) 195 { 196 if ( (unsigned long)n >= 4096 ) 197 { 198 unsigned long __user *buffer = (unsigned long __user *)n; 199 if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 200 || __get_user(n, buffer) 201 || __get_user(inp, ((fd_set __user * __user *)(buffer+1))) 202 || __get_user(outp, ((fd_set __user * __user *)(buffer+2))) 203 || __get_user(exp, ((fd_set __user * __user *)(buffer+3))) 204 || __get_user(tvp, ((struct timeval __user * __user *)(buffer+4)))) 205 return -EFAULT; 206 } 207 return sys_select(n, inp, outp, exp, tvp); 208 } 209 #endif 210 211 #ifdef CONFIG_PPC64 212 long ppc64_personality(unsigned long personality) 213 { 214 long ret; 215 216 if (personality(current->personality) == PER_LINUX32 217 && personality == PER_LINUX) 218 personality = PER_LINUX32; 219 ret = sys_personality(personality); 220 if (ret == PER_LINUX32) 221 ret = PER_LINUX; 222 return ret; 223 } 224 #endif 225 226 #ifdef CONFIG_PPC64 227 #define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32) 228 #else 229 #define OVERRIDE_MACHINE 0 230 #endif 231 232 static inline int override_machine(char __user *mach) 233 { 234 if (OVERRIDE_MACHINE) { 235 /* change ppc64 to ppc */ 236 if (__put_user(0, mach+3) || __put_user(0, mach+4)) 237 return -EFAULT; 238 } 239 return 0; 240 } 241 242 long ppc_newuname(struct new_utsname __user * name) 243 { 244 int err = 0; 245 246 down_read(&uts_sem); 247 if (copy_to_user(name, utsname(), sizeof(*name))) 248 err = -EFAULT; 249 up_read(&uts_sem); 250 if (!err) 251 err = override_machine(name->machine); 252 return err; 253 } 254 255 int sys_uname(struct old_utsname __user *name) 256 { 257 int err = 0; 258 259 down_read(&uts_sem); 260 if (copy_to_user(name, utsname(), sizeof(*name))) 261 err = -EFAULT; 262 up_read(&uts_sem); 263 if (!err) 264 err = override_machine(name->machine); 265 return err; 266 } 267 268 int sys_olduname(struct oldold_utsname __user *name) 269 { 270 int error; 271 272 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) 273 return -EFAULT; 274 275 down_read(&uts_sem); 276 error = __copy_to_user(&name->sysname, &utsname()->sysname, 277 __OLD_UTS_LEN); 278 error |= __put_user(0, name->sysname + __OLD_UTS_LEN); 279 error |= __copy_to_user(&name->nodename, &utsname()->nodename, 280 __OLD_UTS_LEN); 281 error |= __put_user(0, name->nodename + __OLD_UTS_LEN); 282 error |= __copy_to_user(&name->release, &utsname()->release, 283 __OLD_UTS_LEN); 284 error |= __put_user(0, name->release + __OLD_UTS_LEN); 285 error |= __copy_to_user(&name->version, &utsname()->version, 286 __OLD_UTS_LEN); 287 error |= __put_user(0, name->version + __OLD_UTS_LEN); 288 error |= __copy_to_user(&name->machine, &utsname()->machine, 289 __OLD_UTS_LEN); 290 error |= override_machine(name->machine); 291 up_read(&uts_sem); 292 293 return error? -EFAULT: 0; 294 } 295 296 long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low, 297 u32 len_high, u32 len_low) 298 { 299 return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, 300 (u64)len_high << 32 | len_low, advice); 301 } 302 303 void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5, 304 unsigned long r6, unsigned long r7, unsigned long r8, 305 struct pt_regs *regs) 306 { 307 printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p" 308 " cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs, 309 current, smp_processor_id()); 310 } 311 312 void do_show_syscall_exit(unsigned long r3) 313 { 314 printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id()); 315 } 316