2 * linux/arch/m68knommu/kernel/sys_m68k.c
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/m68k
9 #include <linux/errno.h>
10 #include <linux/sched.h>
12 #include <linux/smp.h>
13 #include <linux/sem.h>
14 #include <linux/msg.h>
15 #include <linux/shm.h>
16 #include <linux/stat.h>
17 #include <linux/syscalls.h>
18 #include <linux/mman.h>
19 #include <linux/file.h>
20 #include <linux/ipc.h>
23 #include <asm/setup.h>
24 #include <asm/uaccess.h>
25 #include <asm/cachectl.h>
26 #include <asm/traps.h>
27 #include <asm/cacheflush.h>
28 #include <asm/unistd.h>
31 * Perform the select(nd, in, out, ex, tv) and mmap() system
32 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
33 * handle more than 4 system call parameters, so these system calls
34 * used a memory block for parameter passing..
37 struct mmap_arg_struct {
46 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
48 struct mmap_arg_struct a;
51 if (copy_from_user(&a, arg, sizeof(a)))
55 if (a.offset & ~PAGE_MASK)
58 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
59 a.offset >> PAGE_SHIFT);
65 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
67 * This is really horribly ugly.
69 asmlinkage int sys_ipc (uint call, int first, int second,
70 int third, void *ptr, long fifth)
74 version = call >> 16; /* hack for backward compatibility */
80 return sys_semop (first, (struct sembuf *)ptr, second);
82 return sys_semget (first, second, third);
87 if (get_user(fourth.__pad, (void **) ptr))
89 return sys_semctl (first, second, third, fourth);
97 return sys_msgsnd (first, (struct msgbuf *) ptr,
102 struct ipc_kludge tmp;
105 if (copy_from_user (&tmp,
106 (struct ipc_kludge *)ptr,
109 return sys_msgrcv (first, tmp.msgp, second,
113 return sys_msgrcv (first,
114 (struct msgbuf *) ptr,
115 second, fifth, third);
118 return sys_msgget ((key_t) first, second);
120 return sys_msgctl (first, second,
121 (struct msqid_ds *) ptr);
131 ret = do_shmat (first, ptr, second, &raddr);
134 return put_user (raddr, (ulong __user *) third);
138 return sys_shmdt (ptr);
140 return sys_shmget (first, second, third);
142 return sys_shmctl (first, second, ptr);
150 /* sys_cacheflush -- flush (part of) the processor cache. */
152 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
158 asmlinkage int sys_getpagesize(void)
164 * Do a system call from kernel instead of calling sys_execve so we
165 * end up with proper pt_regs.
167 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
169 register long __res asm ("%d0") = __NR_execve;
170 register long __a asm ("%d1") = (long)(filename);
171 register long __b asm ("%d2") = (long)(argv);
172 register long __c asm ("%d3") = (long)(envp);
173 asm volatile ("trap #0" : "+d" (__res)
174 : "d" (__a), "d" (__b), "d" (__c));
178 asmlinkage unsigned long sys_get_thread_area(void)
180 return current_thread_info()->tp_value;
183 asmlinkage int sys_set_thread_area(unsigned long tp)
185 current_thread_info()->tp_value = tp;
189 /* This syscall gets its arguments in A0 (mem), D2 (oldval) and
192 sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
193 unsigned long __user * mem)
195 struct mm_struct *mm = current->mm;
196 unsigned long mem_value;
198 down_read(&mm->mmap_sem);
201 if (mem_value == oldval)
204 up_read(&mm->mmap_sem);
208 asmlinkage int sys_atomic_barrier(void)
210 /* no code needed for uniprocs */