344 lines
8.2 KiB
C
344 lines
8.2 KiB
C
/*
|
|
* linux/arch/arm/kernel/sys_arm.c
|
|
*
|
|
* Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
|
|
* Copyright (C) 1995, 1996 Russell King.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This file contains various random system calls that
|
|
* have a non-standard calling sequence on the Linux/arm
|
|
* platform.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.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/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/utsname.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/ipc.h>
|
|
|
|
extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
|
|
unsigned long new_len, unsigned long flags,
|
|
unsigned long new_addr);
|
|
|
|
/*
|
|
* 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 __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;
|
|
}
|
|
|
|
/* common code for old and new mmaps */
|
|
inline long do_mmap2(
|
|
unsigned long addr, unsigned long len,
|
|
unsigned long prot, unsigned long flags,
|
|
unsigned long fd, unsigned long pgoff)
|
|
{
|
|
int error = -EINVAL;
|
|
struct file * file = NULL;
|
|
|
|
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
|
|
|
|
if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
|
|
goto out;
|
|
|
|
error = -EBADF;
|
|
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;
|
|
}
|
|
|
|
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 __user *arg)
|
|
{
|
|
int error = -EFAULT;
|
|
struct mmap_arg_struct a;
|
|
|
|
if (copy_from_user(&a, arg, sizeof(a)))
|
|
goto out;
|
|
|
|
error = -EINVAL;
|
|
if (a.offset & ~PAGE_MASK)
|
|
goto out;
|
|
|
|
error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
asmlinkage unsigned long
|
|
sys_arm_mremap(unsigned long addr, unsigned long old_len,
|
|
unsigned long new_len, unsigned long flags,
|
|
unsigned long new_addr)
|
|
{
|
|
unsigned long ret = -EINVAL;
|
|
|
|
if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
|
|
goto out;
|
|
|
|
down_write(¤t->mm->mmap_sem);
|
|
ret = do_mremap(addr, old_len, new_len, flags, new_addr);
|
|
up_write(¤t->mm->mmap_sem);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Perform the select(nd, in, out, ex, tv) and mmap() system
|
|
* calls.
|
|
*/
|
|
|
|
struct sel_arg_struct {
|
|
unsigned long n;
|
|
fd_set __user *inp, *outp, *exp;
|
|
struct timeval __user *tvp;
|
|
};
|
|
|
|
asmlinkage int old_select(struct sel_arg_struct __user *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);
|
|
}
|
|
|
|
#if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT)
|
|
/*
|
|
* 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;
|
|
|
|
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 * __user *) ptr))
|
|
return -EFAULT;
|
|
return sys_semctl (first, second, third, fourth);
|
|
}
|
|
|
|
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);
|
|
|
|
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: /* Of course, we don't support iBCS2! */
|
|
return -EINVAL;
|
|
}
|
|
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 -ENOSYS;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Fork a new task - this creates a new program thread.
|
|
* This is called indirectly via a small wrapper
|
|
*/
|
|
asmlinkage int sys_fork(struct pt_regs *regs)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
|
|
#else
|
|
/* can not support in nommu mode */
|
|
return(-EINVAL);
|
|
#endif
|
|
}
|
|
|
|
/* Clone a task - this clones the calling program thread.
|
|
* This is called indirectly via a small wrapper
|
|
*/
|
|
asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
|
|
int __user *parent_tidptr, int tls_val,
|
|
int __user *child_tidptr, struct pt_regs *regs)
|
|
{
|
|
if (!newsp)
|
|
newsp = regs->ARM_sp;
|
|
|
|
return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
|
|
}
|
|
|
|
asmlinkage int sys_vfork(struct pt_regs *regs)
|
|
{
|
|
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
|
|
}
|
|
|
|
/* sys_execve() executes a new program.
|
|
* This is called indirectly via a small wrapper
|
|
*/
|
|
asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
|
|
char __user * __user *envp, struct pt_regs *regs)
|
|
{
|
|
int error;
|
|
char * filename;
|
|
|
|
filename = getname(filenamei);
|
|
error = PTR_ERR(filename);
|
|
if (IS_ERR(filename))
|
|
goto out;
|
|
error = do_execve(filename, argv, envp, regs);
|
|
putname(filename);
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
|
|
{
|
|
struct pt_regs regs;
|
|
int ret;
|
|
|
|
memset(®s, 0, sizeof(struct pt_regs));
|
|
ret = do_execve((char *)filename, (char __user * __user *)argv,
|
|
(char __user * __user *)envp, ®s);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Save argc to the register structure for userspace.
|
|
*/
|
|
regs.ARM_r0 = ret;
|
|
|
|
/*
|
|
* We were successful. We won't be returning to our caller, but
|
|
* instead to user space by manipulating the kernel stack.
|
|
*/
|
|
asm( "add r0, %0, %1\n\t"
|
|
"mov r1, %2\n\t"
|
|
"mov r2, %3\n\t"
|
|
"bl memmove\n\t" /* copy regs to top of stack */
|
|
"mov r8, #0\n\t" /* not a syscall */
|
|
"mov r9, %0\n\t" /* thread structure */
|
|
"mov sp, r0\n\t" /* reposition stack pointer */
|
|
"b ret_to_user"
|
|
:
|
|
: "r" (current_thread_info()),
|
|
"Ir" (THREAD_START_SP - sizeof(regs)),
|
|
"r" (®s),
|
|
"Ir" (sizeof(regs))
|
|
: "r0", "r1", "r2", "r3", "ip", "lr", "memory");
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(kernel_execve);
|
|
|
|
/*
|
|
* Since loff_t is a 64 bit type we avoid a lot of ABI hastle
|
|
* with a different argument ordering.
|
|
*/
|
|
asmlinkage long sys_arm_fadvise64_64(int fd, int advice,
|
|
loff_t offset, loff_t len)
|
|
{
|
|
return sys_fadvise64_64(fd, offset, len, advice);
|
|
}
|
|
|
|
/*
|
|
* Yet more syscall fsckage - we can't fit sys_sync_file_range's
|
|
* arguments into the available registers with EABI. So, let's
|
|
* create an ARM specific syscall for this which has _sane_
|
|
* arguments. (This incidentally also has an ABI-independent
|
|
* argument layout.)
|
|
*/
|
|
asmlinkage long sys_arm_sync_file_range(int fd, unsigned int flags,
|
|
loff_t offset, loff_t nbytes)
|
|
{
|
|
return sys_sync_file_range(fd, offset, nbytes, flags);
|
|
}
|