Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include "linux/sched.h" |
| 7 | #include "linux/shm.h" |
| 8 | #include "asm/ipc.h" |
| 9 | #include "asm/mman.h" |
| 10 | #include "asm/uaccess.h" |
| 11 | #include "asm/unistd.h" |
| 12 | |
| 13 | /* |
| 14 | * Perform the select(nd, in, out, ex, tv) and mmap() system |
| 15 | * calls. Linux/i386 didn't use to be able to handle more than |
| 16 | * 4 system call parameters, so these system calls used a memory |
| 17 | * block for parameter passing.. |
| 18 | */ |
| 19 | |
| 20 | struct mmap_arg_struct { |
| 21 | unsigned long addr; |
| 22 | unsigned long len; |
| 23 | unsigned long prot; |
| 24 | unsigned long flags; |
| 25 | unsigned long fd; |
| 26 | unsigned long offset; |
| 27 | }; |
| 28 | |
| 29 | extern int old_mmap(unsigned long addr, unsigned long len, |
| 30 | unsigned long prot, unsigned long flags, |
| 31 | unsigned long fd, unsigned long offset); |
| 32 | |
| 33 | long old_mmap_i386(struct mmap_arg_struct __user *arg) |
| 34 | { |
| 35 | struct mmap_arg_struct a; |
| 36 | int err = -EFAULT; |
| 37 | |
| 38 | if (copy_from_user(&a, arg, sizeof(a))) |
| 39 | goto out; |
| 40 | |
| 41 | err = old_mmap(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); |
| 42 | out: |
| 43 | return err; |
| 44 | } |
| 45 | |
| 46 | struct sel_arg_struct { |
| 47 | unsigned long n; |
| 48 | fd_set __user *inp; |
| 49 | fd_set __user *outp; |
| 50 | fd_set __user *exp; |
| 51 | struct timeval __user *tvp; |
| 52 | }; |
| 53 | |
| 54 | long old_select(struct sel_arg_struct __user *arg) |
| 55 | { |
| 56 | struct sel_arg_struct a; |
| 57 | |
| 58 | if (copy_from_user(&a, arg, sizeof(a))) |
| 59 | return -EFAULT; |
| 60 | /* sys_select() does the appropriate kernel locking */ |
| 61 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); |
| 62 | } |
| 63 | |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 64 | /* |
| 65 | * The prototype on i386 is: |
| 66 | * |
| 67 | * int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr) |
| 68 | * |
| 69 | * and the "newtls" arg. on i386 is read by copy_thread directly from the |
| 70 | * register saved on the stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | */ |
| 72 | long sys_clone(unsigned long clone_flags, unsigned long newsp, |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 73 | int __user *parent_tid, void *newtls, int __user *child_tid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | long ret; |
| 76 | |
Jeff Dike | e0877f0 | 2005-06-25 14:55:21 -0700 | [diff] [blame] | 77 | if (!newsp) |
| 78 | newsp = UPT_SP(¤t->thread.regs.regs); |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | current->thread.forking = 1; |
Jeff Dike | e0877f0 | 2005-06-25 14:55:21 -0700 | [diff] [blame] | 81 | ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid, |
| 82 | child_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | current->thread.forking = 0; |
Paolo 'Blaisorblade' Giarrusso | aa6758d | 2006-03-31 02:30:22 -0800 | [diff] [blame] | 84 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | /* |
| 88 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| 89 | * |
| 90 | * This is really horribly ugly. |
| 91 | */ |
| 92 | long sys_ipc (uint call, int first, int second, |
| 93 | int third, void __user *ptr, long fifth) |
| 94 | { |
| 95 | int version, ret; |
| 96 | |
| 97 | version = call >> 16; /* hack for backward compatibility */ |
| 98 | call &= 0xffff; |
| 99 | |
| 100 | switch (call) { |
| 101 | case SEMOP: |
Al Viro | b8719c3 | 2006-06-04 02:51:48 -0700 | [diff] [blame] | 102 | return sys_semtimedop(first, (struct sembuf __user *) ptr, |
| 103 | second, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | case SEMTIMEDOP: |
Al Viro | b8719c3 | 2006-06-04 02:51:48 -0700 | [diff] [blame] | 105 | return sys_semtimedop(first, (struct sembuf __user *) ptr, |
| 106 | second, |
| 107 | (const struct timespec __user *) fifth); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | case SEMGET: |
| 109 | return sys_semget (first, second, third); |
| 110 | case SEMCTL: { |
| 111 | union semun fourth; |
| 112 | if (!ptr) |
| 113 | return -EINVAL; |
Al Viro | 4d338e1 | 2006-03-31 02:30:15 -0800 | [diff] [blame] | 114 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | return -EFAULT; |
| 116 | return sys_semctl (first, second, third, fourth); |
| 117 | } |
| 118 | |
| 119 | case MSGSND: |
| 120 | return sys_msgsnd (first, (struct msgbuf *) ptr, |
| 121 | second, third); |
| 122 | case MSGRCV: |
| 123 | switch (version) { |
| 124 | case 0: { |
| 125 | struct ipc_kludge tmp; |
| 126 | if (!ptr) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | if (copy_from_user(&tmp, |
| 130 | (struct ipc_kludge *) ptr, |
| 131 | sizeof (tmp))) |
| 132 | return -EFAULT; |
| 133 | return sys_msgrcv (first, tmp.msgp, second, |
| 134 | tmp.msgtyp, third); |
| 135 | } |
| 136 | default: |
| 137 | panic("msgrcv with version != 0"); |
| 138 | return sys_msgrcv (first, |
| 139 | (struct msgbuf *) ptr, |
| 140 | second, fifth, third); |
| 141 | } |
| 142 | case MSGGET: |
| 143 | return sys_msgget ((key_t) first, second); |
| 144 | case MSGCTL: |
| 145 | return sys_msgctl (first, second, (struct msqid_ds *) ptr); |
| 146 | |
| 147 | case SHMAT: |
| 148 | switch (version) { |
| 149 | default: { |
| 150 | ulong raddr; |
| 151 | ret = do_shmat (first, (char *) ptr, second, &raddr); |
| 152 | if (ret) |
| 153 | return ret; |
| 154 | return put_user (raddr, (ulong *) third); |
| 155 | } |
| 156 | case 1: /* iBCS2 emulator entry point */ |
| 157 | if (!segment_eq(get_fs(), get_ds())) |
| 158 | return -EINVAL; |
| 159 | return do_shmat (first, (char *) ptr, second, (ulong *) third); |
| 160 | } |
| 161 | case SHMDT: |
| 162 | return sys_shmdt ((char *)ptr); |
| 163 | case SHMGET: |
| 164 | return sys_shmget (first, second, third); |
| 165 | case SHMCTL: |
| 166 | return sys_shmctl (first, second, |
| 167 | (struct shmid_ds *) ptr); |
| 168 | default: |
| 169 | return -ENOSYS; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | long sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 174 | struct old_sigaction __user *oact) |
| 175 | { |
| 176 | struct k_sigaction new_ka, old_ka; |
| 177 | int ret; |
| 178 | |
| 179 | if (act) { |
| 180 | old_sigset_t mask; |
| 181 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 182 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 183 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 184 | return -EFAULT; |
| 185 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 186 | __get_user(mask, &act->sa_mask); |
| 187 | siginitset(&new_ka.sa.sa_mask, mask); |
| 188 | } |
| 189 | |
| 190 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 191 | |
| 192 | if (!ret && oact) { |
| 193 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 194 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 195 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 196 | return -EFAULT; |
| 197 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 198 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 199 | } |
| 200 | |
| 201 | return ret; |
| 202 | } |