sys_sh.c

linux-2.4.29操作系统的源码

/*
 * linux/arch/sh/kernel/sys_sh.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/SuperH
 * platform.
 *
 * Taken from i386 version.
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>

#include <asm/uaccess.h>
#include <asm/ipc.h>
#include <asm/cachectl.h>

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
asmlinkage int sys_pipe(unsigned long r4, unsigned long r5,
	unsigned long r6, unsigned long r7,
	struct pt_regs regs)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		regs.regs[1] = fd[1];
		return fd[0];
	}
	return error;
}

#if defined(__SH4__)
/*
 * To avoid cache alias, we map the shard page with same color.
 */
#define COLOUR_ALIGN(addr)	(((addr)+SHMLBA-1)&~(SHMLBA-1))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct *vma;

	if (flags & MAP_FIXED) {
		/* We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
			return -EINVAL;
		return addr;
	}

	if (len > TASK_SIZE)
		return -ENOMEM;
	if (!addr)
		addr = TASK_UNMAPPED_BASE;

	if (flags & MAP_PRIVATE)
		addr = PAGE_ALIGN(addr);
	else
		addr = COLOUR_ALIGN(addr);

	for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) {
		/* At this point:  (!vma || addr < vma->vm_end). */
		if (TASK_SIZE - len < addr)
			return -ENOMEM;
		if (!vma || addr + len <= vma->vm_start)
			return addr;
		addr = vma->vm_end;
		if (!(flags & MAP_PRIVATE))
			addr = COLOUR_ALIGN(addr);
	}
}
#endif

static inline long
do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, 
	 unsigned long flags, int fd, unsigned long pgoff)
{
	int error = -EBADF;
	struct file *file = NULL;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			goto out;
	}

	down_write(&current->mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&current->mm->mmap_sem);

	if (file)
		fput(file);
out:
	return error;
}

asmlinkage int old_mmap(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	int fd, unsigned long off)
{
	if (off & ~PAGE_MASK)
		return -EINVAL;
	return do_mmap2(addr, len, prot, flags, fd, off>>PAGE_SHIFT);
}

asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long pgoff)
{
	return do_mmap2(addr, len, prot, flags, fd, pgoff);
}

/*
 * 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 *ptr, long fifth)
{
	int version, ret;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	if (call <= SEMCTL)
		switch (call) {
		case SEMOP:
			return sys_semop (first, (struct sembuf *)ptr, second);
		case SEMGET:
			return sys_semget (first, second, third);
		case SEMCTL: {
			union semun fourth;
			if (!ptr)
				return -EINVAL;
			if (get_user(fourth.__pad, (void **) ptr))
				return -EFAULT;
			return sys_semctl (first, second, third, fourth);
			}
		default:
			return -EINVAL;
		}

	if (call <= MSGCTL) 
		switch (call) {
		case MSGSND:
			return sys_msgsnd (first, (struct msgbuf *) 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 *) ptr, 
						   sizeof (tmp)))
					return -EFAULT;
				return sys_msgrcv (first, tmp.msgp, second,
						   tmp.msgtyp, third);
				}
			default:
				return sys_msgrcv (first,
						   (struct msgbuf *) ptr,
						   second, fifth, third);
			}
		case MSGGET:
			return sys_msgget ((key_t) first, second);
		case MSGCTL:
			return sys_msgctl (first, second,
					   (struct msqid_ds *) ptr);
		default:
			return -EINVAL;
		}
	if (call <= SHMCTL) 
		switch (call) {
		case SHMAT:
			switch (version) {
			default: {
				ulong raddr;
				ret = sys_shmat (first, (char *) ptr,
						 second, &raddr);
				if (ret)
					return ret;
				return put_user (raddr, (ulong *) third);
			}
			case 1:	/* iBCS2 emulator entry point */
				if (!segment_eq(get_fs(), get_ds()))
					return -EINVAL;
				return sys_shmat (first, (char *) ptr,
						  second, (ulong *) third);
			}
		case SHMDT: 
			return sys_shmdt ((char *)ptr);
		case SHMGET:
			return sys_shmget (first, second, third);
		case SHMCTL:
			return sys_shmctl (first, second,
					   (struct shmid_ds *) ptr);
		default:
			return -EINVAL;
		}
	
	return -EINVAL;
}

/* sys_cacheflush -- flush (part of) the processor cache.  */
asmlinkage int
sys_cacheflush (unsigned long addr, unsigned long len, int op)
{
	struct vm_area_struct *vma;

	if ((op < 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
		return -EINVAL;

	/*
	 * Verify that the specified address region actually belongs
	 * to this process.
	 */
	if (addr + len < addr)
		return -EFAULT;
	vma = find_vma (current->mm, addr);
	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
		return -EFAULT;

	switch (op & CACHEFLUSH_D_PURGE) {
		case CACHEFLUSH_D_INVAL:
			__flush_invalidate_region(addr, len);
			break;
		case CACHEFLUSH_D_WB:
			__flush_wback_region(addr, len);
			break;
		case CACHEFLUSH_D_PURGE:
			__flush_purge_region(addr, len);
			break;
	}
	if (op & CACHEFLUSH_I) {
		__flush_icache_all();
	}

	return 0;
}

asmlinkage int sys_pause(void)
{
	current->state = TASK_INTERRUPTIBLE;
	schedule();
	return -ERESTARTNOHAND;
}

asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
			     size_t count, long dummy, loff_t pos)
{
	extern asmlinkage ssize_t sys_pread(unsigned int fd, char * buf,
					size_t count, loff_t pos);
	return sys_pread(fd, buf, count, pos);
}

asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
			      size_t count, long dummy, loff_t pos)
{
	extern asmlinkage ssize_t sys_pwrite(unsigned int fd, const char * buf,
					size_t count, loff_t pos);
	return sys_pwrite(fd, buf, count, pos);
}