305 lines
7.6 KiB
C
305 lines
7.6 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* arch/sh64/kernel/sys_sh64.c
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*
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* Copyright (C) 2000, 2001 Paolo Alberelli
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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/SH5
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* platform.
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*
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* Mostly taken from i386 version.
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*
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*/
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#include <linux/errno.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/fs.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/mman.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/syscalls.h>
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#include <linux/ipc.h>
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#include <asm/uaccess.h>
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#include <asm/ptrace.h>
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#include <asm/unistd.h>
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#define REG_3 3
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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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#ifdef NEW_PIPE_IMPLEMENTATION
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asmlinkage int sys_pipe(unsigned long * fildes,
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unsigned long dummy_r3,
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unsigned long dummy_r4,
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unsigned long dummy_r5,
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unsigned long dummy_r6,
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unsigned long dummy_r7,
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struct pt_regs * regs) /* r8 = pt_regs forced by entry.S */
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{
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int fd[2];
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int ret;
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ret = do_pipe(fd);
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if (ret == 0)
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/*
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***********************************************************************
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* To avoid the copy_to_user we prefer to break the ABIs convention, *
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* packing the valid pair of file IDs into a single register (r3); *
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* while r2 is the return code as defined by the sh5-ABIs. *
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* BE CAREFUL: pipe stub, into glibc, must be aware of this solution *
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***********************************************************************
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#ifdef __LITTLE_ENDIAN__
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regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]);
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#else
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regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]);
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#endif
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*/
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/* although not very clever this is endianess independent */
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regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd);
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return ret;
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}
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#else
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asmlinkage int sys_pipe(unsigned long * fildes)
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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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if (copy_to_user(fildes, fd, 2*sizeof(int)))
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error = -EFAULT;
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}
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return error;
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}
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#endif
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/*
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* To avoid cache alias, we map the shard page with same color.
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*/
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#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct vm_area_struct *vma;
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if (flags & MAP_FIXED) {
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/* We do not accept a shared mapping if it would violate
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* cache aliasing constraints.
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*/
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if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
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return -EINVAL;
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return addr;
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}
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if (len > TASK_SIZE)
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return -ENOMEM;
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if (!addr)
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addr = TASK_UNMAPPED_BASE;
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if (flags & MAP_PRIVATE)
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addr = PAGE_ALIGN(addr);
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else
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addr = COLOUR_ALIGN(addr);
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for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
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/* At this point: (!vma || addr < vma->vm_end). */
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if (TASK_SIZE - len < addr)
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return -ENOMEM;
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if (!vma || addr + len <= vma->vm_start)
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return addr;
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addr = vma->vm_end;
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if (!(flags & MAP_PRIVATE))
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addr = COLOUR_ALIGN(addr);
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}
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}
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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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asmlinkage int old_mmap(unsigned long addr, unsigned long len,
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unsigned long prot, unsigned long flags,
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int fd, unsigned long off)
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{
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if (off & ~PAGE_MASK)
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return -EINVAL;
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return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
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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 __user *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_semtimedop(first, (struct sembuf __user *)ptr,
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second, NULL);
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case SEMTIMEDOP:
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return sys_semtimedop(first, (struct sembuf __user *)ptr,
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second,
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(const struct timespec __user *)fifth);
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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 * __user *) 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 __user *) 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 __user *) 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 __user *) 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 __user *) 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 __user *) 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 __user *) third);
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}
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case 1: /* iBCS2 emulator entry point */
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if (!segment_eq(get_fs(), get_ds()))
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return -EINVAL;
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return do_shmat (first, (char __user *) ptr,
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second, (ulong *) third);
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}
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case SHMDT:
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return sys_shmdt ((char __user *)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 __user *) 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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asmlinkage int sys_uname(struct old_utsname * name)
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{
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int err;
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if (!name)
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return -EFAULT;
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down_read(&uts_sem);
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err = copy_to_user(name, utsname(), sizeof (*name));
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up_read(&uts_sem);
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return err?-EFAULT:0;
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}
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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 unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
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register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
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register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
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register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
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__asm__ __volatile__ ("trapa %1 !\t\t\t execve(%2,%3,%4)"
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: "=r" (__sc0)
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: "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
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__asm__ __volatile__ ("!dummy %0 %1 %2 %3"
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: : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
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return __sc0;
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}
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