/* * This file contains various random system calls that * have a non-standard calling sequence on the Linux/i386 * platform. */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/smp.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #include <linux/syscalls.h> #include <linux/mman.h> #include <linux/file.h> #include <linux/utsname.h> #include <linux/ipc.h> #include <linux/uaccess.h> #include <linux/unistd.h> #include <asm/syscalls.h> asmlinkage long sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { int error = -EBADF; struct file *file = NULL; struct mm_struct *mm = current->mm; flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(&mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(&mm->mmap_sem); if (file) fput(file); out: return error; } /* * Perform the select(nd, in, out, ex, tv) and mmap() system * calls. Linux/i386 didn't use to be able to handle more than * 4 system call parameters, so these system calls used a memory * block for parameter passing.. */ struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; asmlinkage int old_mmap(struct mmap_arg_struct __user *arg) { struct mmap_arg_struct a; int err = -EFAULT; if (copy_from_user(&a, arg, sizeof(a))) goto out; err = -EINVAL; if (a.offset & ~PAGE_MASK) goto out; err = sys_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); out: return err; } struct sel_arg_struct { unsigned long n; fd_set __user *inp, *outp, *exp; struct timeval __user *tvp; }; asmlinkage int old_select(struct sel_arg_struct __user *arg) { struct sel_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; /* sys_select() does the appropriate kernel locking */ return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); } /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */ asmlinkage int sys_ipc(uint call, int first, int second, int third, void __user *ptr, long fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget(first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void __user * __user *) ptr)) return -EFAULT; return sys_semctl(first, second, third, fourth); } case MSGSND: return sys_msgsnd(first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof(tmp))) return -EFAULT; return sys_msgrcv(first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv(first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget((key_t) first, second); case MSGCTL: return sys_msgctl(first, second, (struct msqid_ds __user *) ptr); case SHMAT: switch (version) { default: { ulong raddr; ret = do_shmat(first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user(raddr, (ulong __user *) third); } case 1: /* iBCS2 emulator entry point */ if (!segment_eq(get_fs(), get_ds())) return -EINVAL; /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */ return do_shmat(first, (char __user *) ptr, second, (ulong *) third); } case SHMDT: return sys_shmdt((char __user *)ptr); case SHMGET: return sys_shmget(first, second, third); case SHMCTL: return sys_shmctl(first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; } } /* * Old cruft */ asmlinkage int sys_uname(struct old_utsname __user *name) { int err; if (!name) return -EFAULT; down_read(&uts_sem); err = copy_to_user(name, utsname(), sizeof(*name)); up_read(&uts_sem); return err? -EFAULT:0; } asmlinkage int sys_olduname(struct oldold_utsname __user *name) { int error; if (!name) return -EFAULT; if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) return -EFAULT; down_read(&uts_sem); error = __copy_to_user(&name->sysname, &utsname()->sysname, __OLD_UTS_LEN); error |= __put_user(0, name->sysname + __OLD_UTS_LEN); error |= __copy_to_user(&name->nodename, &utsname()->nodename, __OLD_UTS_LEN); error |= __put_user(0, name->nodename + __OLD_UTS_LEN); error |= __copy_to_user(&name->release, &utsname()->release, __OLD_UTS_LEN); error |= __put_user(0, name->release + __OLD_UTS_LEN); error |= __copy_to_user(&name->version, &utsname()->version, __OLD_UTS_LEN); error |= __put_user(0, name->version + __OLD_UTS_LEN); error |= __copy_to_user(&name->machine, &utsname()->machine, __OLD_UTS_LEN); error |= __put_user(0, name->machine + __OLD_UTS_LEN); up_read(&uts_sem); error = error ? -EFAULT : 0; return error; } /* * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */ int kernel_execve(const char *filename, char *const argv[], char *const envp[]) { long __res; asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx" : "=a" (__res) : "0" (__NR_execve), "ri" (filename), "c" (argv), "d" (envp) : "memory"); return __res; }