304 lines
7.6 KiB
C
304 lines
7.6 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* arch/sh64/kernel/sys_sh64.c
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
*
|
|
* This file contains various random system calls that
|
|
* have a non-standard calling sequence on the Linux/SH5
|
|
* platform.
|
|
*
|
|
* Mostly taken from i386 version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.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 <linux/syscalls.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/ipc.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/unistd.h>
|
|
|
|
#define REG_3 3
|
|
|
|
/*
|
|
* sys_pipe() is the normal C calling standard for creating
|
|
* a pipe. It's not the way Unix traditionally does this, though.
|
|
*/
|
|
#ifdef NEW_PIPE_IMPLEMENTATION
|
|
asmlinkage int sys_pipe(unsigned long * fildes,
|
|
unsigned long dummy_r3,
|
|
unsigned long dummy_r4,
|
|
unsigned long dummy_r5,
|
|
unsigned long dummy_r6,
|
|
unsigned long dummy_r7,
|
|
struct pt_regs * regs) /* r8 = pt_regs forced by entry.S */
|
|
{
|
|
int fd[2];
|
|
int ret;
|
|
|
|
ret = do_pipe(fd);
|
|
if (ret == 0)
|
|
/*
|
|
***********************************************************************
|
|
* To avoid the copy_to_user we prefer to break the ABIs convention, *
|
|
* packing the valid pair of file IDs into a single register (r3); *
|
|
* while r2 is the return code as defined by the sh5-ABIs. *
|
|
* BE CAREFUL: pipe stub, into glibc, must be aware of this solution *
|
|
***********************************************************************
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
regs->regs[REG_3] = (((unsigned long long) fd[1]) << 32) | ((unsigned long long) fd[0]);
|
|
#else
|
|
regs->regs[REG_3] = (((unsigned long long) fd[0]) << 32) | ((unsigned long long) fd[1]);
|
|
#endif
|
|
|
|
*/
|
|
/* although not very clever this is endianess independent */
|
|
regs->regs[REG_3] = (unsigned long long) *((unsigned long long *) fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#else
|
|
asmlinkage int sys_pipe(unsigned long * fildes)
|
|
{
|
|
int fd[2];
|
|
int error;
|
|
|
|
error = do_pipe(fd);
|
|
if (!error) {
|
|
if (copy_to_user(fildes, fd, 2*sizeof(int)))
|
|
error = -EFAULT;
|
|
}
|
|
return error;
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
/* common code for old and new mmaps */
|
|
static inline long do_mmap2(
|
|
unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags,
|
|
unsigned long 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(¤t->mm->mmap_sem);
|
|
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
if (file)
|
|
fput(file);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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 __user *ptr, long fifth)
|
|
{
|
|
int version, ret;
|
|
|
|
version = call >> 16; /* hack for backward compatibility */
|
|
call &= 0xffff;
|
|
|
|
if (call <= SEMCTL)
|
|
switch (call) {
|
|
case SEMOP:
|
|
return sys_semtimedop(first, (struct sembuf __user *)ptr,
|
|
second, NULL);
|
|
case SEMTIMEDOP:
|
|
return sys_semtimedop(first, (struct sembuf __user *)ptr,
|
|
second,
|
|
(const struct timespec __user *)fifth);
|
|
case SEMGET:
|
|
return sys_semget (first, second, third);
|
|
case SEMCTL: {
|
|
union semun fourth;
|
|
if (!ptr)
|
|
return -EINVAL;
|
|
if (get_user(fourth.__pad, (void * __user *) 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 __user *) 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 __user *) ptr,
|
|
sizeof (tmp)))
|
|
return -EFAULT;
|
|
return sys_msgrcv (first, tmp.msgp, second,
|
|
tmp.msgtyp, third);
|
|
}
|
|
default:
|
|
return sys_msgrcv (first,
|
|
(struct msgbuf __user *) ptr,
|
|
second, fifth, third);
|
|
}
|
|
case MSGGET:
|
|
return sys_msgget ((key_t) first, second);
|
|
case MSGCTL:
|
|
return sys_msgctl (first, second,
|
|
(struct msqid_ds __user *) ptr);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (call <= SHMCTL)
|
|
switch (call) {
|
|
case SHMAT:
|
|
switch (version) {
|
|
default: {
|
|
ulong raddr;
|
|
ret = do_shmat (first, (char __user *) ptr,
|
|
second, &raddr);
|
|
if (ret)
|
|
return ret;
|
|
return put_user (raddr, (ulong __user *) third);
|
|
}
|
|
case 1: /* iBCS2 emulator entry point */
|
|
if (!segment_eq(get_fs(), get_ds()))
|
|
return -EINVAL;
|
|
return do_shmat (first, (char __user *) ptr,
|
|
second, (ulong *) third);
|
|
}
|
|
case SHMDT:
|
|
return sys_shmdt ((char __user *)ptr);
|
|
case SHMGET:
|
|
return sys_shmget (first, second, third);
|
|
case SHMCTL:
|
|
return sys_shmctl (first, second,
|
|
(struct shmid_ds __user *) ptr);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
asmlinkage int sys_uname(struct old_utsname * name)
|
|
{
|
|
int err;
|
|
if (!name)
|
|
return -EFAULT;
|
|
down_read(&uts_sem);
|
|
err = copy_to_user(name, utsname(), sizeof (*name));
|
|
up_read(&uts_sem);
|
|
return err?-EFAULT:0;
|
|
}
|
|
|
|
/*
|
|
* Do a system call from kernel instead of calling sys_execve so we
|
|
* end up with proper pt_regs.
|
|
*/
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
register unsigned long __sc0 __asm__ ("r9") = ((0x13 << 16) | __NR_execve);
|
|
register unsigned long __sc2 __asm__ ("r2") = (unsigned long) filename;
|
|
register unsigned long __sc3 __asm__ ("r3") = (unsigned long) argv;
|
|
register unsigned long __sc4 __asm__ ("r4") = (unsigned long) envp;
|
|
__asm__ __volatile__ ("trapa %1 !\t\t\t execve(%2,%3,%4)"
|
|
: "=r" (__sc0)
|
|
: "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) );
|
|
__asm__ __volatile__ ("!dummy %0 %1 %2 %3"
|
|
: : "r" (__sc0), "r" (__sc2), "r" (__sc3), "r" (__sc4) : "memory");
|
|
return __sc0;
|
|
}
|