/*
* Implementation of various system calls for Linux/PowerPC
*
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Derived from "arch/i386/kernel/sys_i386.c"
* Adapted from the i386 version by Gary Thomas
* Modified by Cort Dougan (cort@cs.nmt.edu)
* and Paul Mackerras (paulus@cs.anu.edu.au).
*
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/PPC
* platform.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/fs.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/sys.h>
#include <linux/ipc.h>
#include <linux/utsname.h>
#include <linux/file.h>
#include <linux/init.h>
#include <linux/personality.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <asm/syscalls.h>
#include <asm/time.h>
#include <asm/unistd.h>
/*
* sys_ipc() is the de-multiplexer for the SysV IPC calls..
*
* This is really horribly ugly.
*/
int sys_ipc(uint call, int first, unsigned long second, long third,
void __user *ptr, long fifth)
{
int version, ret;
version = call >> 16; /* hack for backward compatibility */
call &= 0xffff;
ret = -ENOSYS;
switch (call) {
case SEMOP:
ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
(unsigned)second, NULL);
break;
case SEMTIMEDOP:
ret = sys_semtimedop(first, (struct sembuf __user *)ptr,
(unsigned)second,
(const struct timespec __user *) fifth);
break;
case SEMGET:
ret = sys_semget (first, (int)second, third);
break;
case SEMCTL: {
union semun fourth;
ret = -EINVAL;
if (!ptr)
break;
if ((ret = get_user(fourth.__pad, (void __user * __user *)ptr)))
break;
ret = sys_semctl(first, (int)second, third, fourth);
break;
}
case MSGSND:
ret = sys_msgsnd(first, (struct msgbuf __user *)ptr,
(size_t)second, third);
break;
case MSGRCV:
switch (version) {
case 0: {
struct ipc_kludge tmp;
ret = -EINVAL;
if (!ptr)
break;
if ((ret = copy_from_user(&tmp,
(struct ipc_kludge __user *) ptr,
sizeof (tmp)) ? -EFAULT : 0))
break;
ret = sys_msgrcv(first, tmp.msgp, (size_t) second,
tmp.msgtyp, third);
break;
}
default:
ret = sys_msgrcv (first, (struct msgbuf __user *) ptr,
(size_t)second, fifth, third);
break;
}
break;
case MSGGET:
ret = sys_msgget((key_t)first, (int)second);
break;
case MSGCTL:
ret = sys_msgctl(first, (int)second,
(struct msqid_ds __user *)ptr);
break;
case SHMAT: {
ulong raddr;
ret = do_shmat(first, (char __user *)ptr, (int)second, &raddr);
if (ret)
break;
ret = put_user(raddr, (ulong __user *) third);
break;
}
case SHMDT:
ret = sys_shmdt((char __user *)ptr);
break;
case SHMGET:
ret = sys_shmget(first, (size_t)second, third);
break;
case SHMCTL:
ret = sys_shmctl(first, (int)second,
(struct shmid_ds __user *)ptr);
break;
}
return ret;
}
/*
* sys_pipe() is the normal C calling standard for creating
* a pipe. It's not the way unix traditionally does this, though.
*/
int sys_pipe(int __user *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;
}
static inline unsigned long do_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long off, int shift)
{
struct file * file = NULL;
unsigned long ret = -EINVAL;
if (shift) {
if (off & ((1 << shift) - 1))
goto out;
off >>= shift;
}
ret = -EBADF;
if (!(flags & MAP_ANONYMOUS)) {
if (!(file = fget(fd)))
goto out;
}
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
down_write(¤t->mm->mmap_sem);
ret = do_mmap_pgoff(file, addr, len, prot, flags, off);
up_write(¤t->mm->mmap_sem);
if (file)
fput(file);
out:
return ret;
}
unsigned long sys_mmap2(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
return do_mmap2(addr, len, prot, flags, fd, pgoff, PAGE_SHIFT-12);
}
unsigned long sys_mmap(unsigned long addr, size_t len,
unsigned long prot, unsigned long flags,
unsigned long fd, off_t offset)
{
return do_mmap2(addr, len, prot, flags, fd, offset, PAGE_SHIFT);
}
#ifdef CONFIG_PPC32
/*
* Due to some executables calling the wrong select we sometimes
* get wrong args. This determines how the args are being passed
* (a single ptr to them all args passed) then calls
* sys_select() with the appropriate args. -- Cort
*/
int
ppc_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timeval __user *tvp)
{
if ( (unsigned long)n >= 4096 )
{
unsigned long __user *buffer = (unsigned long __user *)n;
if (!access_ok(VERIFY_READ, buffer, 5*sizeof(unsigned long))
|| __get_user(n, buffer)
|| __get_user(inp, ((fd_set __user * __user *)(buffer+1)))
|| __get_user(outp, ((fd_set __user * __user *)(buffer+2)))
|| __get_user(exp, ((fd_set __user * __user *)(buffer+3)))
|| __get_user(tvp, ((struct timeval __user * __user *)(buffer+4))))
return -EFAULT;
}
return sys_select(n, inp, outp, exp, tvp);
}
#endif
#ifdef CONFIG_PPC64
long ppc64_personality(unsigned long personality)
{
long ret;
if (personality(current->personality) == PER_LINUX32
&& personality == PER_LINUX)
personality = PER_LINUX32;
ret = sys_personality(personality);
if (ret == PER_LINUX32)
ret = PER_LINUX;
return ret;
}
#endif
#ifdef CONFIG_PPC64
#define OVERRIDE_MACHINE (personality(current->personality) == PER_LINUX32)
#else
#define OVERRIDE_MACHINE 0
#endif
static inline int override_machine(char __user *mach)
{
if (OVERRIDE_MACHINE) {
/* change ppc64 to ppc */
if (__put_user(0, mach+3) || __put_user(0, mach+4))
return -EFAULT;
}
return 0;
}
long ppc_newuname(struct new_utsname __user * name)
{
int err = 0;
down_read(&uts_sem);
if (copy_to_user(name, utsname(), sizeof(*name)))
err = -EFAULT;
up_read(&uts_sem);
if (!err)
err = override_machine(name->machine);
return err;
}
int sys_uname(struct old_utsname __user *name)
{
int err = 0;
down_read(&uts_sem);
if (copy_to_user(name, utsname(), sizeof(*name)))
err = -EFAULT;
up_read(&uts_sem);
if (!err)
err = override_machine(name->machine);
return err;
}
int sys_olduname(struct oldold_utsname __user *name)
{
int error;
if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
return -EFAULT;
down_read(&uts_sem);
error = __copy_to_user(&name->sysname, &utsname()->sysname,
__OLD_UTS_LEN);
error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
error |= __copy_to_user(&name->nodename, &utsname()->nodename,
__OLD_UTS_LEN);
error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
error |= __copy_to_user(&name->release, &utsname()->release,
__OLD_UTS_LEN);
error |= __put_user(0, name->release + __OLD_UTS_LEN);
error |= __copy_to_user(&name->version, &utsname()->version,
__OLD_UTS_LEN);
error |= __put_user(0, name->version + __OLD_UTS_LEN);
error |= __copy_to_user(&name->machine, &utsname()->machine,
__OLD_UTS_LEN);
error |= override_machine(name->machine);
up_read(&uts_sem);
return error? -EFAULT: 0;
}
long ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
u32 len_high, u32 len_low)
{
return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low,
(u64)len_high << 32 | len_low, advice);
}
void do_show_syscall(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7, unsigned long r8,
struct pt_regs *regs)
{
printk("syscall %ld(%lx, %lx, %lx, %lx, %lx, %lx) regs=%p current=%p"
" cpu=%d\n", regs->gpr[0], r3, r4, r5, r6, r7, r8, regs,
current, smp_processor_id());
}
void do_show_syscall_exit(unsigned long r3)
{
printk(" -> %lx, current=%p cpu=%d\n", r3, current, smp_processor_id());
}
