290 строки
6.3 KiB
C
290 строки
6.3 KiB
C
/*
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* linux/arch/h8300/kernel/sys_h8300.c
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*
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* This file contains various random system calls that
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* have a non-standard calling sequence on the H8/300
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* platform.
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*/
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/stat.h>
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#include <linux/syscalls.h>
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#include <linux/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/fs.h>
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#include <linux/ipc.h>
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#include <asm/setup.h>
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#include <asm/uaccess.h>
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#include <asm/cachectl.h>
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#include <asm/traps.h>
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#include <asm/unistd.h>
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/* common code for old and new mmaps */
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static inline long do_mmap2(
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unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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int error = -EBADF;
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struct file * file = NULL;
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flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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if (!(flags & MAP_ANONYMOUS)) {
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file = fget(fd);
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if (!file)
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goto out;
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}
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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return do_mmap2(addr, len, prot, flags, fd, pgoff);
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}
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/*
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* Perform the select(nd, in, out, ex, tv) and mmap() system
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* calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
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* handle more than 4 system call parameters, so these system calls
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* used a memory block for parameter passing..
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*/
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struct mmap_arg_struct {
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unsigned long addr;
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unsigned long len;
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unsigned long prot;
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unsigned long flags;
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unsigned long fd;
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unsigned long offset;
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};
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asmlinkage int old_mmap(struct mmap_arg_struct *arg)
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{
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struct mmap_arg_struct a;
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int error = -EFAULT;
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if (copy_from_user(&a, arg, sizeof(a)))
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goto out;
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error = -EINVAL;
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if (a.offset & ~PAGE_MASK)
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goto out;
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a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
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out:
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return error;
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}
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#if 0 /* DAVIDM - do we want this */
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struct mmap_arg_struct64 {
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__u32 addr;
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__u32 len;
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__u32 prot;
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__u32 flags;
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__u64 offset; /* 64 bits */
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__u32 fd;
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};
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asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
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{
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int error = -EFAULT;
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struct file * file = NULL;
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struct mmap_arg_struct64 a;
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unsigned long pgoff;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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if ((long)a.offset & ~PAGE_MASK)
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return -EINVAL;
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pgoff = a.offset >> PAGE_SHIFT;
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if ((a.offset >> PAGE_SHIFT) != pgoff)
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return -EINVAL;
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if (!(a.flags & MAP_ANONYMOUS)) {
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error = -EBADF;
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file = fget(a.fd);
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if (!file)
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goto out;
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}
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a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
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down_write(¤t->mm->mmap_sem);
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error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
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up_write(¤t->mm->mmap_sem);
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if (file)
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fput(file);
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out:
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return error;
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}
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#endif
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struct sel_arg_struct {
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unsigned long n;
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fd_set *inp, *outp, *exp;
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struct timeval *tvp;
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};
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asmlinkage int old_select(struct sel_arg_struct *arg)
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{
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struct sel_arg_struct a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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/* sys_select() does the appropriate kernel locking */
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return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
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}
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/*
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* sys_ipc() is the de-multiplexer for the SysV IPC calls..
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*
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* This is really horribly ugly.
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*/
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asmlinkage int sys_ipc (uint call, int first, int second,
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int third, void *ptr, long fifth)
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{
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int version, ret;
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version = call >> 16; /* hack for backward compatibility */
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call &= 0xffff;
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if (call <= SEMCTL)
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switch (call) {
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case SEMOP:
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return sys_semop (first, (struct sembuf *)ptr, second);
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case SEMGET:
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return sys_semget (first, second, third);
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case SEMCTL: {
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union semun fourth;
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if (!ptr)
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return -EINVAL;
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if (get_user(fourth.__pad, (void **) ptr))
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return -EFAULT;
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return sys_semctl (first, second, third, fourth);
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}
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default:
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return -EINVAL;
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}
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if (call <= MSGCTL)
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switch (call) {
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case MSGSND:
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return sys_msgsnd (first, (struct msgbuf *) ptr,
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second, third);
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case MSGRCV:
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switch (version) {
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case 0: {
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struct ipc_kludge tmp;
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if (!ptr)
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return -EINVAL;
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if (copy_from_user (&tmp,
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(struct ipc_kludge *)ptr,
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sizeof (tmp)))
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return -EFAULT;
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return sys_msgrcv (first, tmp.msgp, second,
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tmp.msgtyp, third);
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}
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default:
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return sys_msgrcv (first,
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(struct msgbuf *) ptr,
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second, fifth, third);
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}
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case MSGGET:
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return sys_msgget ((key_t) first, second);
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case MSGCTL:
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return sys_msgctl (first, second,
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(struct msqid_ds *) ptr);
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default:
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return -EINVAL;
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}
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if (call <= SHMCTL)
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switch (call) {
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case SHMAT:
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switch (version) {
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default: {
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ulong raddr;
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ret = do_shmat (first, (char *) ptr,
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second, &raddr);
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if (ret)
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return ret;
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return put_user (raddr, (ulong *) third);
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}
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}
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case SHMDT:
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return sys_shmdt ((char *)ptr);
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case SHMGET:
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return sys_shmget (first, second, third);
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case SHMCTL:
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return sys_shmctl (first, second,
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(struct shmid_ds *) ptr);
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default:
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return -EINVAL;
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}
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return -EINVAL;
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}
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/* sys_cacheflush -- no support. */
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asmlinkage int
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sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
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{
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return -EINVAL;
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}
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asmlinkage int sys_getpagesize(void)
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{
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return PAGE_SIZE;
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}
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#if defined(CONFIG_SYSCALL_PRINT)
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asmlinkage void syscall_print(void *dummy,...)
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{
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struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
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printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
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((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
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}
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#endif
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/*
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* Do a system call from kernel instead of calling sys_execve so we
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* end up with proper pt_regs.
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*/
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int kernel_execve(const char *filename, char *const argv[], char *const envp[])
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{
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register long res __asm__("er0");
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register char *const *_c __asm__("er3") = envp;
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register char *const *_b __asm__("er2") = argv;
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register const char * _a __asm__("er1") = filename;
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__asm__ __volatile__ ("mov.l %1,er0\n\t"
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"trapa #0\n\t"
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: "=r" (res)
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: "g" (__NR_execve),
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"g" (_a),
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"g" (_b),
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"g" (_c)
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: "cc", "memory");
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return res;
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}
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