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);
64 struct sel_arg_struct {
66 fd_set *inp, *outp, *exp;
70 asmlinkage int old_select(struct sel_arg_struct *arg)
72 struct sel_arg_struct a;
74 if (copy_from_user(&a, arg, sizeof(a)))
76 /* sys_select() does the appropriate kernel locking */
77 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
81 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
83 * This is really horribly ugly.
85 asmlinkage int sys_ipc (uint call, int first, int second,
86 int third, void *ptr, long fifth)
90 version = call >> 16; /* hack for backward compatibility */
96 return sys_semop (first, (struct sembuf *)ptr, second);
98 return sys_semget (first, second, third);
103 if (get_user(fourth.__pad, (void **) ptr))
105 return sys_semctl (first, second, third, fourth);
113 return sys_msgsnd (first, (struct msgbuf *) ptr,
118 struct ipc_kludge tmp;
121 if (copy_from_user (&tmp,
122 (struct ipc_kludge *)ptr,
125 return sys_msgrcv (first, tmp.msgp, second,
129 return sys_msgrcv (first,
130 (struct msgbuf *) ptr,
131 second, fifth, third);
134 return sys_msgget ((key_t) first, second);
136 return sys_msgctl (first, second,
137 (struct msqid_ds *) ptr);
147 ret = do_shmat (first, ptr, second, &raddr);
150 return put_user (raddr, (ulong __user *) third);
154 return sys_shmdt (ptr);
156 return sys_shmget (first, second, third);
158 return sys_shmctl (first, second, ptr);
166 /* sys_cacheflush -- flush (part of) the processor cache. */
168 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
174 asmlinkage int sys_getpagesize(void)
180 * Do a system call from kernel instead of calling sys_execve so we
181 * end up with proper pt_regs.
183 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
185 register long __res asm ("%d0") = __NR_execve;
186 register long __a asm ("%d1") = (long)(filename);
187 register long __b asm ("%d2") = (long)(argv);
188 register long __c asm ("%d3") = (long)(envp);
189 asm volatile ("trap #0" : "+d" (__res)
190 : "d" (__a), "d" (__b), "d" (__c));
194 asmlinkage unsigned long sys_get_thread_area(void)
196 return current_thread_info()->tp_value;
199 asmlinkage int sys_set_thread_area(unsigned long tp)
201 current_thread_info()->tp_value = tp;
205 /* This syscall gets its arguments in A0 (mem), D2 (oldval) and
208 sys_atomic_cmpxchg_32(unsigned long newval, int oldval, int d3, int d4, int d5,
209 unsigned long __user * mem)
211 struct mm_struct *mm = current->mm;
212 unsigned long mem_value;
214 down_read(&mm->mmap_sem);
217 if (mem_value == oldval)
220 up_read(&mm->mmap_sem);
224 asmlinkage int sys_atomic_barrier(void)
226 /* no code needed for uniprocs */