linux/arch/h8300/kernel/sys_h8300.c
Ulrich Drepper d35c7b0e54 unified (weak) sys_pipe implementation
This replaces the duplicated arch-specific versions of "sys_pipe()" with
one unified implementation.  This removes almost 250 lines of duplicated
code.

It's marked __weak, so that *if* an architecture wants to override the
default implementation it can do so by simply having its own replacement
version, since many architectures use alternate calling conventions for
the 'pipe()' system call for legacy reasons (ie traditional UNIX
implementations often return the two file descriptors in registers)

I still haven't changed the cris version even though Linus says the BKL
isn't needed.  The arch maintainer can easily do it if there are really
no obstacles.

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-03 13:50:33 -07:00

289 lines
6.3 KiB
C

/*
* linux/arch/h8300/kernel/sys_h8300.c
*
* This file contains various random system calls that
* have a non-standard calling sequence on the H8/300
* platform.
*/
#include <linux/errno.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/syscalls.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/fs.h>
#include <linux/ipc.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/traps.h>
#include <asm/unistd.h>
/* 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(&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 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);
}
/*
* Perform the select(nd, in, out, ex, tv) and mmap() system
* calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
* handle more than 4 system call parameters, so these system calls
* used a memory block for parameter passing..
*/
struct mmap_arg_struct {
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};
asmlinkage int old_mmap(struct mmap_arg_struct *arg)
{
struct mmap_arg_struct a;
int error = -EFAULT;
if (copy_from_user(&a, arg, sizeof(a)))
goto out;
error = -EINVAL;
if (a.offset & ~PAGE_MASK)
goto out;
a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
out:
return error;
}
#if 0 /* DAVIDM - do we want this */
struct mmap_arg_struct64 {
__u32 addr;
__u32 len;
__u32 prot;
__u32 flags;
__u64 offset; /* 64 bits */
__u32 fd;
};
asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
{
int error = -EFAULT;
struct file * file = NULL;
struct mmap_arg_struct64 a;
unsigned long pgoff;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
if ((long)a.offset & ~PAGE_MASK)
return -EINVAL;
pgoff = a.offset >> PAGE_SHIFT;
if ((a.offset >> PAGE_SHIFT) != pgoff)
return -EINVAL;
if (!(a.flags & MAP_ANONYMOUS)) {
error = -EBADF;
file = fget(a.fd);
if (!file)
goto out;
}
a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
down_write(&current->mm->mmap_sem);
error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
up_write(&current->mm->mmap_sem);
if (file)
fput(file);
out:
return error;
}
#endif
struct sel_arg_struct {
unsigned long n;
fd_set *inp, *outp, *exp;
struct timeval *tvp;
};
asmlinkage int old_select(struct sel_arg_struct *arg)
{
struct sel_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
/* sys_select() does the appropriate kernel locking */
return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
}
/*
* 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 = do_shmat (first, (char *) ptr,
second, &raddr);
if (ret)
return ret;
return put_user (raddr, (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 -- no support. */
asmlinkage int
sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
{
return -EINVAL;
}
asmlinkage int sys_getpagesize(void)
{
return PAGE_SIZE;
}
#if defined(CONFIG_SYSCALL_PRINT)
asmlinkage void syscall_print(void *dummy,...)
{
struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
printk("call %06lx:%ld 1:%08lx,2:%08lx,3:%08lx,ret:%08lx\n",
((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
}
#endif
/*
* 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 long res __asm__("er0");
register char *const *_c __asm__("er3") = envp;
register char *const *_b __asm__("er2") = argv;
register const char * _a __asm__("er1") = filename;
__asm__ __volatile__ ("mov.l %1,er0\n\t"
"trapa #0\n\t"
: "=r" (res)
: "g" (__NR_execve),
"g" (_a),
"g" (_b),
"g" (_c)
: "cc", "memory");
return res;
}