Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/i386/kernel/sys_i386.c |
| 3 | * |
| 4 | * This file contains various random system calls that |
| 5 | * have a non-standard calling sequence on the Linux/i386 |
| 6 | * platform. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/errno.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/mm.h> |
| 12 | #include <linux/smp.h> |
| 13 | #include <linux/smp_lock.h> |
| 14 | #include <linux/sem.h> |
| 15 | #include <linux/msg.h> |
| 16 | #include <linux/shm.h> |
| 17 | #include <linux/stat.h> |
| 18 | #include <linux/syscalls.h> |
| 19 | #include <linux/mman.h> |
| 20 | #include <linux/file.h> |
| 21 | #include <linux/utsname.h> |
| 22 | |
| 23 | #include <asm/uaccess.h> |
| 24 | #include <asm/ipc.h> |
| 25 | |
| 26 | /* |
| 27 | * sys_pipe() is the normal C calling standard for creating |
| 28 | * a pipe. It's not the way Unix traditionally does this, though. |
| 29 | */ |
| 30 | asmlinkage int sys_pipe(unsigned long __user * fildes) |
| 31 | { |
| 32 | int fd[2]; |
| 33 | int error; |
| 34 | |
| 35 | error = do_pipe(fd); |
| 36 | if (!error) { |
| 37 | if (copy_to_user(fildes, fd, 2*sizeof(int))) |
| 38 | error = -EFAULT; |
| 39 | } |
| 40 | return error; |
| 41 | } |
| 42 | |
Michael Buesch | a7290ee | 2006-03-22 00:08:44 -0800 | [diff] [blame] | 43 | asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, |
| 44 | unsigned long prot, unsigned long flags, |
| 45 | unsigned long fd, unsigned long pgoff) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | { |
| 47 | int error = -EBADF; |
Michael Buesch | a7290ee | 2006-03-22 00:08:44 -0800 | [diff] [blame] | 48 | struct file *file = NULL; |
| 49 | struct mm_struct *mm = current->mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
| 51 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| 52 | if (!(flags & MAP_ANONYMOUS)) { |
| 53 | file = fget(fd); |
| 54 | if (!file) |
| 55 | goto out; |
| 56 | } |
| 57 | |
Michael Buesch | a7290ee | 2006-03-22 00:08:44 -0800 | [diff] [blame] | 58 | down_write(&mm->mmap_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
Michael Buesch | a7290ee | 2006-03-22 00:08:44 -0800 | [diff] [blame] | 60 | up_write(&mm->mmap_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | if (file) |
| 63 | fput(file); |
| 64 | out: |
| 65 | return error; |
| 66 | } |
| 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | /* |
| 69 | * Perform the select(nd, in, out, ex, tv) and mmap() system |
| 70 | * calls. Linux/i386 didn't use to be able to handle more than |
| 71 | * 4 system call parameters, so these system calls used a memory |
| 72 | * block for parameter passing.. |
| 73 | */ |
| 74 | |
| 75 | struct mmap_arg_struct { |
| 76 | unsigned long addr; |
| 77 | unsigned long len; |
| 78 | unsigned long prot; |
| 79 | unsigned long flags; |
| 80 | unsigned long fd; |
| 81 | unsigned long offset; |
| 82 | }; |
| 83 | |
| 84 | asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) |
| 85 | { |
| 86 | struct mmap_arg_struct a; |
| 87 | int err = -EFAULT; |
| 88 | |
| 89 | if (copy_from_user(&a, arg, sizeof(a))) |
| 90 | goto out; |
| 91 | |
| 92 | err = -EINVAL; |
| 93 | if (a.offset & ~PAGE_MASK) |
| 94 | goto out; |
| 95 | |
Michael Buesch | a7290ee | 2006-03-22 00:08:44 -0800 | [diff] [blame] | 96 | err = sys_mmap2(a.addr, a.len, a.prot, a.flags, |
| 97 | a.fd, a.offset >> PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | out: |
| 99 | return err; |
| 100 | } |
| 101 | |
| 102 | |
| 103 | struct sel_arg_struct { |
| 104 | unsigned long n; |
| 105 | fd_set __user *inp, *outp, *exp; |
| 106 | struct timeval __user *tvp; |
| 107 | }; |
| 108 | |
| 109 | asmlinkage int old_select(struct sel_arg_struct __user *arg) |
| 110 | { |
| 111 | struct sel_arg_struct a; |
| 112 | |
| 113 | if (copy_from_user(&a, arg, sizeof(a))) |
| 114 | return -EFAULT; |
| 115 | /* sys_select() does the appropriate kernel locking */ |
| 116 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| 121 | * |
| 122 | * This is really horribly ugly. |
| 123 | */ |
| 124 | asmlinkage int sys_ipc (uint call, int first, int second, |
| 125 | int third, void __user *ptr, long fifth) |
| 126 | { |
| 127 | int version, ret; |
| 128 | |
| 129 | version = call >> 16; /* hack for backward compatibility */ |
| 130 | call &= 0xffff; |
| 131 | |
| 132 | switch (call) { |
| 133 | case SEMOP: |
| 134 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); |
| 135 | case SEMTIMEDOP: |
| 136 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, |
| 137 | (const struct timespec __user *)fifth); |
| 138 | |
| 139 | case SEMGET: |
| 140 | return sys_semget (first, second, third); |
| 141 | case SEMCTL: { |
| 142 | union semun fourth; |
| 143 | if (!ptr) |
| 144 | return -EINVAL; |
| 145 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) |
| 146 | return -EFAULT; |
| 147 | return sys_semctl (first, second, third, fourth); |
| 148 | } |
| 149 | |
| 150 | case MSGSND: |
| 151 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, |
| 152 | second, third); |
| 153 | case MSGRCV: |
| 154 | switch (version) { |
| 155 | case 0: { |
| 156 | struct ipc_kludge tmp; |
| 157 | if (!ptr) |
| 158 | return -EINVAL; |
| 159 | |
| 160 | if (copy_from_user(&tmp, |
| 161 | (struct ipc_kludge __user *) ptr, |
| 162 | sizeof (tmp))) |
| 163 | return -EFAULT; |
| 164 | return sys_msgrcv (first, tmp.msgp, second, |
| 165 | tmp.msgtyp, third); |
| 166 | } |
| 167 | default: |
| 168 | return sys_msgrcv (first, |
| 169 | (struct msgbuf __user *) ptr, |
| 170 | second, fifth, third); |
| 171 | } |
| 172 | case MSGGET: |
| 173 | return sys_msgget ((key_t) first, second); |
| 174 | case MSGCTL: |
| 175 | return sys_msgctl (first, second, (struct msqid_ds __user *) ptr); |
| 176 | |
| 177 | case SHMAT: |
| 178 | switch (version) { |
| 179 | default: { |
| 180 | ulong raddr; |
| 181 | ret = do_shmat (first, (char __user *) ptr, second, &raddr); |
| 182 | if (ret) |
| 183 | return ret; |
| 184 | return put_user (raddr, (ulong __user *) third); |
| 185 | } |
| 186 | case 1: /* iBCS2 emulator entry point */ |
| 187 | if (!segment_eq(get_fs(), get_ds())) |
| 188 | return -EINVAL; |
| 189 | /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */ |
| 190 | return do_shmat (first, (char __user *) ptr, second, (ulong *) third); |
| 191 | } |
| 192 | case SHMDT: |
| 193 | return sys_shmdt ((char __user *)ptr); |
| 194 | case SHMGET: |
| 195 | return sys_shmget (first, second, third); |
| 196 | case SHMCTL: |
| 197 | return sys_shmctl (first, second, |
| 198 | (struct shmid_ds __user *) ptr); |
| 199 | default: |
| 200 | return -ENOSYS; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Old cruft |
| 206 | */ |
| 207 | asmlinkage int sys_uname(struct old_utsname __user * name) |
| 208 | { |
| 209 | int err; |
| 210 | if (!name) |
| 211 | return -EFAULT; |
| 212 | down_read(&uts_sem); |
| 213 | err=copy_to_user(name, &system_utsname, sizeof (*name)); |
| 214 | up_read(&uts_sem); |
| 215 | return err?-EFAULT:0; |
| 216 | } |
| 217 | |
| 218 | asmlinkage int sys_olduname(struct oldold_utsname __user * name) |
| 219 | { |
| 220 | int error; |
| 221 | |
| 222 | if (!name) |
| 223 | return -EFAULT; |
| 224 | if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname))) |
| 225 | return -EFAULT; |
| 226 | |
| 227 | down_read(&uts_sem); |
| 228 | |
| 229 | error = __copy_to_user(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN); |
| 230 | error |= __put_user(0,name->sysname+__OLD_UTS_LEN); |
| 231 | error |= __copy_to_user(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN); |
| 232 | error |= __put_user(0,name->nodename+__OLD_UTS_LEN); |
| 233 | error |= __copy_to_user(&name->release,&system_utsname.release,__OLD_UTS_LEN); |
| 234 | error |= __put_user(0,name->release+__OLD_UTS_LEN); |
| 235 | error |= __copy_to_user(&name->version,&system_utsname.version,__OLD_UTS_LEN); |
| 236 | error |= __put_user(0,name->version+__OLD_UTS_LEN); |
| 237 | error |= __copy_to_user(&name->machine,&system_utsname.machine,__OLD_UTS_LEN); |
| 238 | error |= __put_user(0,name->machine+__OLD_UTS_LEN); |
| 239 | |
| 240 | up_read(&uts_sem); |
| 241 | |
| 242 | error = error ? -EFAULT : 0; |
| 243 | |
| 244 | return error; |
| 245 | } |