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1624 |
jcastillo |
/* $Id: sys_sparc.c,v 1.1 2005-12-20 09:50:43 jcastillo Exp $
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* linux/arch/sparc/kernel/sys_sparc.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 Linux/sparc
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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/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/mman.h>
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#include <asm/segment.h>
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/* XXX Make this per-binary type, this way we can detect the type of
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* XXX a binary. Every Sparc executable calls this very early on.
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*/
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asmlinkage unsigned long sys_getpagesize(void)
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{
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return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
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}
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/*
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* sys_pipe() is the normal C calling standard for creating
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* a pipe. It's not the way unix traditionally does this, though.
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*/
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asmlinkage int sparc_pipe(struct pt_regs *regs)
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{
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int fd[2];
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int error;
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error = do_pipe(fd);
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if (error) {
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return error;
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} else {
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regs->u_regs[UREG_I1] = fd[1];
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return fd[0];
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}
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}
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/* Note most sanity checking already done in sclow.S code. */
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asmlinkage int quick_sys_write(unsigned int fd, char *buf, unsigned int count)
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{
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struct file *file = current->files->fd[fd];
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struct inode *inode = file->f_inode;
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int error;
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error = verify_area(VERIFY_READ, buf, count);
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if(error)
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return error;
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/*
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* If data has been written to the file, remove the setuid and
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* the setgid bits. We do it anyway otherwise there is an
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* extremely exploitable race - does your OS get it right |->
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*
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* Set ATTR_FORCE so it will always be changed.
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*/
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if (!suser() && (inode->i_mode & (S_ISUID | S_ISGID))) {
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struct iattr newattrs;
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newattrs.ia_mode = inode->i_mode & ~(S_ISUID | S_ISGID);
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newattrs.ia_valid = ATTR_CTIME | ATTR_MODE | ATTR_FORCE;
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notify_change(inode, &newattrs);
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}
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down(&inode->i_sem);
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error = file->f_op->write(inode,file,buf,count);
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up(&inode->i_sem);
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return error;
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}
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/* XXX do we need this crap? XXX */
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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, int third, void *ptr, long fifth)
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{
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int version;
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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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int err;
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if (!ptr)
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return -EINVAL;
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if ((err = verify_area (VERIFY_READ, ptr, sizeof(long))))
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return err;
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fourth.__pad = (void *) get_fs_long(ptr);
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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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int err;
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if (!ptr)
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return -EINVAL;
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if ((err = verify_area (VERIFY_READ, ptr, sizeof(tmp))))
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return err;
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memcpy_fromfs (&tmp,(struct ipc_kludge *) ptr,
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sizeof (tmp));
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return sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
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}
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case 1: default:
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return sys_msgrcv (first, (struct msgbuf *) ptr, 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, (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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case 0: default: {
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ulong raddr;
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int err;
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if ((err = verify_area(VERIFY_WRITE, (ulong*) third, sizeof(ulong))))
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return err;
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err = sys_shmat (first, (char *) ptr, second, &raddr);
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if (err)
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return err;
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put_fs_long (raddr, (ulong *) third);
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return 0;
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}
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case 1: /* iBCS2 emulator entry point */
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if (get_fs() != get_ds())
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return -EINVAL;
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return sys_shmat (first, (char *) ptr, second, (ulong *) third);
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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, (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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unsigned long get_sparc_unmapped_area(unsigned long len)
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{
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unsigned long addr = 0xE8000000UL;
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struct vm_area_struct * vmm;
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if (len > TASK_SIZE)
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return 0;
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for (vmm = find_vma(current, addr); ; vmm = vmm->vm_next) {
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/* At this point: (!vmm || addr < vmm->vm_end). */
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if (TASK_SIZE - len < addr)
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return 0;
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if (!vmm || addr + len <= vmm->vm_start)
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return addr;
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addr = vmm->vm_end;
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}
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}
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/* Linux version of mmap */
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asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags, unsigned long fd,
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unsigned long off)
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{
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struct file * file = NULL;
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long retval;
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if (!(flags & MAP_ANONYMOUS)) {
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if (fd >= NR_OPEN || !(file = current->files->fd[fd])){
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return -EBADF;
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}
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}
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if(!(flags & MAP_FIXED) && !addr) {
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addr = get_sparc_unmapped_area(len);
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if(!addr){
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return -ENOMEM;
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}
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}
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retval = do_mmap(file, addr, len, prot, flags, off);
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return retval;
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}
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