1/* 2 * BK Id: SCCS/s.syscalls.c 1.13 03/13/02 09:12:22 trini 3 */ 4/* 5 * linux/arch/ppc/kernel/sys_ppc.c 6 * 7 * PowerPC version 8 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) 9 * 10 * Derived from "arch/i386/kernel/sys_i386.c" 11 * Adapted from the i386 version by Gary Thomas 12 * Modified by Cort Dougan (cort@cs.nmt.edu) 13 * and Paul Mackerras (paulus@cs.anu.edu.au). 14 * 15 * This file contains various random system calls that 16 * have a non-standard calling sequence on the Linux/PPC 17 * platform. 18 * 19 * This program is free software; you can redistribute it and/or 20 * modify it under the terms of the GNU General Public License 21 * as published by the Free Software Foundation; either version 22 * 2 of the License, or (at your option) any later version. 23 * 24 */ 25 26#include <linux/config.h> 27#include <linux/errno.h> 28#include <linux/sched.h> 29#include <linux/mm.h> 30#include <linux/smp.h> 31#include <linux/smp_lock.h> 32#include <linux/sem.h> 33#include <linux/msg.h> 34#include <linux/shm.h> 35#include <linux/stat.h> 36#include <linux/mman.h> 37#include <linux/sys.h> 38#include <linux/ipc.h> 39#include <linux/utsname.h> 40#include <linux/file.h> 41 42#include <asm/uaccess.h> 43#include <asm/ipc.h> 44#include <asm/semaphore.h> 45 46void 47check_bugs(void) 48{ 49} 50 51int sys_ioperm(unsigned long from, unsigned long num, int on) 52{ 53 printk(KERN_ERR "sys_ioperm()\n"); 54 return -EIO; 55} 56 57int sys_iopl(int a1, int a2, int a3, int a4) 58{ 59 printk(KERN_ERR "sys_iopl(%x, %x, %x, %x)!\n", a1, a2, a3, a4); 60 return (-ENOSYS); 61} 62 63int sys_vm86(int a1, int a2, int a3, int a4) 64{ 65 printk(KERN_ERR "sys_vm86(%x, %x, %x, %x)!\n", a1, a2, a3, a4); 66 return (-ENOSYS); 67} 68 69int sys_modify_ldt(int a1, int a2, int a3, int a4) 70{ 71 printk(KERN_ERR "sys_modify_ldt(%x, %x, %x, %x)!\n", a1, a2, a3, a4); 72 return (-ENOSYS); 73} 74 75/* 76 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 77 * 78 * This is really horribly ugly. 79 */ 80int 81sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth) 82{ 83 int version, ret; 84 85 version = call >> 16; /* hack for backward compatibility */ 86 call &= 0xffff; 87 88 ret = -EINVAL; 89 switch (call) { 90 case SEMOP: 91 ret = sys_semop (first, (struct sembuf *)ptr, second); 92 break; 93 case SEMGET: 94 ret = sys_semget (first, second, third); 95 break; 96 case SEMCTL: { 97 union semun fourth; 98 99 if (!ptr) 100 break; 101 if ((ret = verify_area (VERIFY_READ, ptr, sizeof(long))) 102 || (ret = get_user(fourth.__pad, (void **)ptr))) 103 break; 104 ret = sys_semctl (first, second, third, fourth); 105 break; 106 } 107 case MSGSND: 108 ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third); 109 break; 110 case MSGRCV: 111 switch (version) { 112 case 0: { 113 struct ipc_kludge tmp; 114 115 if (!ptr) 116 break; 117 if ((ret = verify_area (VERIFY_READ, ptr, sizeof(tmp))) 118 || (ret = copy_from_user(&tmp, 119 (struct ipc_kludge *) ptr, 120 sizeof (tmp)))) 121 break; 122 ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, 123 third); 124 break; 125 } 126 default: 127 ret = sys_msgrcv (first, (struct msgbuf *) ptr, 128 second, fifth, third); 129 break; 130 } 131 break; 132 case MSGGET: 133 ret = sys_msgget ((key_t) first, second); 134 break; 135 case MSGCTL: 136 ret = sys_msgctl (first, second, (struct msqid_ds *) ptr); 137 break; 138 case SHMAT: 139 switch (version) { 140 default: { 141 ulong raddr; 142 143 if ((ret = verify_area(VERIFY_WRITE, (ulong*) third, 144 sizeof(ulong)))) 145 break; 146 ret = sys_shmat (first, (char *) ptr, second, &raddr); 147 if (ret) 148 break; 149 ret = put_user (raddr, (ulong *) third); 150 break; 151 } 152 case 1: /* iBCS2 emulator entry point */ 153 if (!segment_eq(get_fs(), get_ds())) 154 break; 155 ret = sys_shmat (first, (char *) ptr, second, 156 (ulong *) third); 157 break; 158 } 159 break; 160 case SHMDT: 161 ret = sys_shmdt ((char *)ptr); 162 break; 163 case SHMGET: 164 ret = sys_shmget (first, second, third); 165 break; 166 case SHMCTL: 167 ret = sys_shmctl (first, second, (struct shmid_ds *) ptr); 168 break; 169 } 170 171 return ret; 172} 173 174/* 175 * sys_pipe() is the normal C calling standard for creating 176 * a pipe. It's not the way unix traditionally does this, though. 177 */ 178int sys_pipe(int *fildes) 179{ 180 int fd[2]; 181 int error; 182 183 error = do_pipe(fd); 184 if (!error) { 185 if (copy_to_user(fildes, fd, 2*sizeof(int))) 186 error = -EFAULT; 187 } 188 return error; 189} 190 191static inline unsigned long 192do_mmap2(unsigned long addr, size_t len, 193 unsigned long prot, unsigned long flags, 194 unsigned long fd, unsigned long pgoff) 195{ 196 struct file * file = NULL; 197 int ret = -EBADF; 198 199 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 200 if (!(flags & MAP_ANONYMOUS)) { 201 if (!(file = fget(fd))) 202 goto out; 203 } 204 205 down_write(¤t->mm->mmap_sem); 206 ret = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 207 up_write(¤t->mm->mmap_sem); 208 if (file) 209 fput(file); 210out: 211 return ret; 212} 213 214unsigned long sys_mmap2(unsigned long addr, size_t len, 215 unsigned long prot, unsigned long flags, 216 unsigned long fd, unsigned long pgoff) 217{ 218 return do_mmap2(addr, len, prot, flags, fd, pgoff); 219} 220 221unsigned long sys_mmap(unsigned long addr, size_t len, 222 unsigned long prot, unsigned long flags, 223 unsigned long fd, off_t offset) 224{ 225 int err = -EINVAL; 226 unsigned long off = offset; 227 228 if (offset & ~PAGE_MASK) 229 goto out; 230 231 err = do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT); 232out: 233 return err; 234} 235 236extern int sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *); 237 238/* 239 * Due to some executables calling the wrong select we sometimes 240 * get wrong args. This determines how the args are being passed 241 * (a single ptr to them all args passed) then calls 242 * sys_select() with the appropriate args. -- Cort 243 */ 244int 245ppc_select(int n, fd_set *inp, fd_set *outp, fd_set *exp, struct timeval *tvp) 246{ 247 if ( (unsigned long)n >= 4096 ) 248 { 249 unsigned long *buffer = (unsigned long *)n; 250 if (verify_area(VERIFY_READ, buffer, 5*sizeof(unsigned long)) 251 || __get_user(n, buffer) 252 || __get_user(inp, ((fd_set **)(buffer+1))) 253 || __get_user(outp, ((fd_set **)(buffer+2))) 254 || __get_user(exp, ((fd_set **)(buffer+3))) 255 || __get_user(tvp, ((struct timeval **)(buffer+4)))) 256 return -EFAULT; 257 } 258 return sys_select(n, inp, outp, exp, tvp); 259} 260 261int sys_pause(void) 262{ 263 current->state = TASK_INTERRUPTIBLE; 264 schedule(); 265 return -ERESTARTNOHAND; 266} 267 268int sys_uname(struct old_utsname * name) 269{ 270 int err = -EFAULT; 271 272 down_read(&uts_sem); 273 if (name && !copy_to_user(name, &system_utsname, sizeof (*name))) 274 err = 0; 275 up_read(&uts_sem); 276 return err; 277} 278 279int sys_olduname(struct oldold_utsname * name) 280{ 281 int error; 282 283 if (!name) 284 return -EFAULT; 285 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) 286 return -EFAULT; 287 288 down_read(&uts_sem); 289 error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); 290 error -= __put_user(0,name->sysname+__OLD_UTS_LEN); 291 error -= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); 292 error -= __put_user(0,name->nodename+__OLD_UTS_LEN); 293 error -= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); 294 error -= __put_user(0,name->release+__OLD_UTS_LEN); 295 error -= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); 296 error -= __put_user(0,name->version+__OLD_UTS_LEN); 297 error -= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); 298 error = __put_user(0,name->machine+__OLD_UTS_LEN); 299 up_read(&uts_sem); 300 301 error = error ? -EFAULT : 0; 302 return error; 303} 304 305#ifndef CONFIG_PCI 306/* 307 * Those are normally defined in arch/ppc/kernel/pci.c. But when CONFIG_PCI is 308 * not defined, this file is not linked at all, so here are the "empty" versions 309 */ 310int sys_pciconfig_read(void) { return -ENOSYS; } 311int sys_pciconfig_write(void) { return -ENOSYS; } 312long sys_pciconfig_iobase(void) { return -ENOSYS; } 313#endif 314