338 строки
8.0 KiB
C
338 строки
8.0 KiB
C
/*
|
|
* 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/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/module.h>
|
|
#include <linux/fs.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/ipc.h>
|
|
#include <asm/unistd.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)
|
|
{
|
|
struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
|
|
int fd[2];
|
|
int error;
|
|
|
|
error = do_pipe(fd);
|
|
if (!error) {
|
|
regs->regs[1] = fd[1];
|
|
return fd[0];
|
|
}
|
|
return error;
|
|
}
|
|
|
|
unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
|
|
|
|
EXPORT_SYMBOL(shm_align_mask);
|
|
|
|
#ifdef CONFIG_MMU
|
|
/*
|
|
* To avoid cache aliases, we map the shared page with same color.
|
|
*/
|
|
#define COLOUR_ALIGN(addr, pgoff) \
|
|
((((addr) + shm_align_mask) & ~shm_align_mask) + \
|
|
(((pgoff) << PAGE_SHIFT) & shm_align_mask))
|
|
|
|
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct mm_struct *mm = current->mm;
|
|
struct vm_area_struct *vma;
|
|
unsigned long start_addr;
|
|
int do_colour_align;
|
|
|
|
if (flags & MAP_FIXED) {
|
|
/* We do not accept a shared mapping if it would violate
|
|
* cache aliasing constraints.
|
|
*/
|
|
if ((flags & MAP_SHARED) && (addr & shm_align_mask))
|
|
return -EINVAL;
|
|
return addr;
|
|
}
|
|
|
|
if (unlikely(len > TASK_SIZE))
|
|
return -ENOMEM;
|
|
|
|
do_colour_align = 0;
|
|
if (filp || (flags & MAP_SHARED))
|
|
do_colour_align = 1;
|
|
|
|
if (addr) {
|
|
if (do_colour_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(addr);
|
|
|
|
vma = find_vma(mm, addr);
|
|
if (TASK_SIZE - len >= addr &&
|
|
(!vma || addr + len <= vma->vm_start))
|
|
return addr;
|
|
}
|
|
|
|
if (len > mm->cached_hole_size) {
|
|
start_addr = addr = mm->free_area_cache;
|
|
} else {
|
|
mm->cached_hole_size = 0;
|
|
start_addr = addr = TASK_UNMAPPED_BASE;
|
|
}
|
|
|
|
full_search:
|
|
if (do_colour_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
else
|
|
addr = PAGE_ALIGN(mm->free_area_cache);
|
|
|
|
for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
|
|
/* At this point: (!vma || addr < vma->vm_end). */
|
|
if (unlikely(TASK_SIZE - len < addr)) {
|
|
/*
|
|
* Start a new search - just in case we missed
|
|
* some holes.
|
|
*/
|
|
if (start_addr != TASK_UNMAPPED_BASE) {
|
|
start_addr = addr = TASK_UNMAPPED_BASE;
|
|
mm->cached_hole_size = 0;
|
|
goto full_search;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
if (likely(!vma || addr + len <= vma->vm_start)) {
|
|
/*
|
|
* Remember the place where we stopped the search:
|
|
*/
|
|
mm->free_area_cache = addr + len;
|
|
return addr;
|
|
}
|
|
if (addr + mm->cached_hole_size < vma->vm_start)
|
|
mm->cached_hole_size = vma->vm_start - addr;
|
|
|
|
addr = vma->vm_end;
|
|
if (do_colour_align)
|
|
addr = COLOUR_ALIGN(addr, pgoff);
|
|
}
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
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(¤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 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 __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;
|
|
}
|
|
|
|
asmlinkage ssize_t sys_pread_wrapper(unsigned int fd, char * buf,
|
|
size_t count, long dummy, loff_t pos)
|
|
{
|
|
return sys_pread64(fd, buf, count, pos);
|
|
}
|
|
|
|
asmlinkage ssize_t sys_pwrite_wrapper(unsigned int fd, const char * buf,
|
|
size_t count, long dummy, loff_t pos)
|
|
{
|
|
return sys_pwrite64(fd, buf, count, pos);
|
|
}
|
|
|
|
asmlinkage int sys_fadvise64_64_wrapper(int fd, u32 offset0, u32 offset1,
|
|
u32 len0, u32 len1, int advice)
|
|
{
|
|
#ifdef __LITTLE_ENDIAN__
|
|
return sys_fadvise64_64(fd, (u64)offset1 << 32 | offset0,
|
|
(u64)len1 << 32 | len0, advice);
|
|
#else
|
|
return sys_fadvise64_64(fd, (u64)offset0 << 32 | offset1,
|
|
(u64)len0 << 32 | len1, advice);
|
|
#endif
|
|
}
|
|
|
|
#if defined(CONFIG_CPU_SH2) || defined(CONFIG_CPU_SH2A)
|
|
#define SYSCALL_ARG3 "trapa #0x23"
|
|
#else
|
|
#define SYSCALL_ARG3 "trapa #0x13"
|
|
#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 __sc0 __asm__ ("r3") = __NR_execve;
|
|
register long __sc4 __asm__ ("r4") = (long) filename;
|
|
register long __sc5 __asm__ ("r5") = (long) argv;
|
|
register long __sc6 __asm__ ("r6") = (long) envp;
|
|
__asm__ __volatile__ (SYSCALL_ARG3 : "=z" (__sc0)
|
|
: "0" (__sc0), "r" (__sc4), "r" (__sc5), "r" (__sc6)
|
|
: "memory");
|
|
return __sc0;
|
|
}
|