337 lines
8 KiB
C
337 lines
8 KiB
C
/*
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* linux/arch/sh/kernel/sys_sh.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/SuperH
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* platform.
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*
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* Taken from i386 version.
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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/module.h>
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#include <linux/fs.h>
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#include <asm/cacheflush.h>
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#include <asm/uaccess.h>
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#include <asm/ipc.h>
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#include <asm/unistd.h>
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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 sys_pipe(unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7,
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struct pt_regs __regs)
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{
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struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
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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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regs->regs[1] = fd[1];
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return fd[0];
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}
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return error;
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}
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unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
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EXPORT_SYMBOL(shm_align_mask);
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#ifdef CONFIG_MMU
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/*
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* To avoid cache aliases, we map the shared page with same color.
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*/
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#define COLOUR_ALIGN(addr, pgoff) \
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((((addr) + shm_align_mask) & ~shm_align_mask) + \
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(((pgoff) << PAGE_SHIFT) & shm_align_mask))
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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 mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long start_addr;
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int do_colour_align;
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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 & shm_align_mask))
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return -EINVAL;
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return addr;
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}
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if (unlikely(len > TASK_SIZE))
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return -ENOMEM;
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do_colour_align = 0;
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if (filp || (flags & MAP_SHARED))
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do_colour_align = 1;
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if (addr) {
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if (do_colour_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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else
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addr = PAGE_ALIGN(addr);
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vma = find_vma(mm, addr);
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if (TASK_SIZE - len >= addr &&
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(!vma || addr + len <= vma->vm_start))
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return addr;
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}
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if (len > mm->cached_hole_size) {
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start_addr = addr = mm->free_area_cache;
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} else {
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mm->cached_hole_size = 0;
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start_addr = addr = TASK_UNMAPPED_BASE;
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}
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full_search:
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if (do_colour_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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else
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addr = PAGE_ALIGN(mm->free_area_cache);
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for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
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/* At this point: (!vma || addr < vma->vm_end). */
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if (unlikely(TASK_SIZE - len < addr)) {
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/*
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* Start a new search - just in case we missed
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* some holes.
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*/
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if (start_addr != TASK_UNMAPPED_BASE) {
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start_addr = addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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goto full_search;
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}
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return -ENOMEM;
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}
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if (likely(!vma || addr + len <= vma->vm_start)) {
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/*
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* Remember the place where we stopped the search:
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*/
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mm->free_area_cache = addr + len;
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return addr;
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}
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if (addr + mm->cached_hole_size < vma->vm_start)
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mm->cached_hole_size = vma->vm_start - addr;
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addr = vma->vm_end;
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if (do_colour_align)
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addr = COLOUR_ALIGN(addr, pgoff);
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}
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}
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#endif /* CONFIG_MMU */
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static inline long
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do_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
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unsigned long flags, int 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 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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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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* 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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asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
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size_t count, long dummy, loff_t pos)
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{
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return sys_pread64(fd, buf, count, pos);
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}
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asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
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size_t count, long dummy, loff_t pos)
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{
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return sys_pwrite64(fd, buf, count, pos);
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}
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asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
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u32 len0, u32 len1, int advice)
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{
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#ifdef __LITTLE_ENDIAN__
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return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
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(u64)len1 << 32 | len0, advice);
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#else
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return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
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(u64)len0 << 32 | len1, advice);
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#endif
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}
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#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
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#define SYSCALL_ARG3 "trapa #0x23"
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#else
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#define SYSCALL_ARG3 "trapa #0x13"
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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 __sc0 __asm__ ("r3") = __NR_execve;
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register long __sc4 __asm__ ("r4") = (long) filename;
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register long __sc5 __asm__ ("r5") = (long) argv;
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register long __sc6 __asm__ ("r6") = (long) envp;
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__asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
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: "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
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: "memory");
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return __sc0;
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}
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