blob: b4e7bcb43540444d6db2f4a56855711cc56ffe02 [file] [log] [blame]
* linux/arch/m32r/kernel/sys_m32r.c
* This file contains various random system calls that
* have a non-standard calling sequence on the Linux/M32R platform.
* Taken from i386 version.
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.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 <asm/uaccess.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/ipc.h>
#include <asm/syscall.h>
#include <asm/unistd.h>
* sys_tas() - test-and-set
asmlinkage int sys_tas(int __user *addr)
int oldval;
if (!access_ok(VERIFY_WRITE, addr, sizeof (int)))
return -EFAULT;
/* atomic operation:
* oldval = *addr; *addr = 1;
__asm__ __volatile__ (
DCACHE_CLEAR("%0", "r4", "%1")
" .fillinsn\n"
" lock %0, @%1 -> unlock %2, @%1\n"
/* NOTE:
* The m32r processor can accept interrupts only
* at the 32-bit instruction boundary.
* So, in the above code, the "unlock" instruction
* can be executed continuously after the "lock"
* instruction execution without any interruptions.
".section .fixup,\"ax\"\n"
" .balign 4\n"
"3: ldi %0, #%3\n"
" seth r14, #high(2b)\n"
" or3 r14, r14, #low(2b)\n"
" jmp r14\n"
".section __ex_table,\"a\"\n"
" .balign 4\n"
" .long 1b,3b\n"
: "=&r" (oldval)
: "r" (addr), "r" (1), "i"(-EFAULT)
: "r14", "memory"
#ifdef CONFIG_CHIP_M32700_TS1
, "r4"
#endif /* CONFIG_CHIP_M32700_TS1 */
return oldval;
* 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 r0, unsigned long r1, unsigned long r2,
unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, struct pt_regs regs)
int fd[2];
int error;
error = do_pipe(fd);
if (!error) {
if (copy_to_user((void __user *)r0, fd, 2*sizeof(int)))
error = -EFAULT;
return error;
asmlinkage long sys_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;
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
goto out;
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
if (file)
return error;
* 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);
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);
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: {
ulong raddr;
if (!access_ok(VERIFY_WRITE, (ulong __user *) third,
return -EFAULT;
ret = do_shmat (first, (char __user *) ptr, second, &raddr);
if (ret)
return ret;
return put_user (raddr, (ulong __user *) 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);
return -ENOSYS;
asmlinkage int sys_uname(struct old_utsname __user * name)
int err;
if (!name)
return -EFAULT;
err = copy_to_user(name, utsname(), sizeof (*name));
return err?-EFAULT:0;
asmlinkage int sys_cacheflush(void *addr, int bytes, int cache)
/* This should flush more selectivly ... */
return 0;
asmlinkage int sys_cachectl(char *addr, int nbytes, int op)
/* Not implemented yet. */
return -ENOSYS;
* 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 __scno __asm__ ("r7") = __NR_execve;
register long __arg3 __asm__ ("r2") = (long)(envp);
register long __arg2 __asm__ ("r1") = (long)(argv);
register long __res __asm__ ("r0") = (long)(filename);
__asm__ __volatile__ (
"trap #" SYSCALL_VECTOR "|| nop"
: "=r" (__res)
: "r" (__scno), "0" (__res), "r" (__arg2),
"r" (__arg3)
: "memory");
return __res;