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/smp_lock.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/syscalls.h>
19 #include <linux/mman.h>
20 #include <linux/file.h>
21 #include <linux/utsname.h>
23 #include <asm/setup.h>
24 #include <asm/uaccess.h>
25 #include <asm/cachectl.h>
26 #include <asm/traps.h>
28 #include <asm/cacheflush.h>
29 #include <asm/unistd.h>
32 * sys_pipe() is the normal C calling standard for creating
33 * a pipe. It's not the way unix traditionally does this, though.
35 asmlinkage int sys_pipe(unsigned long * fildes)
42 if (copy_to_user(fildes, fd, 2*sizeof(int)))
48 /* common code for old and new mmaps */
49 static inline long do_mmap2(
50 unsigned long addr, unsigned long len,
51 unsigned long prot, unsigned long flags,
52 unsigned long fd, unsigned long pgoff)
55 struct file * file = NULL;
57 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
58 if (!(flags & MAP_ANONYMOUS)) {
64 down_write(¤t->mm->mmap_sem);
65 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
66 up_write(¤t->mm->mmap_sem);
74 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
75 unsigned long prot, unsigned long flags,
76 unsigned long fd, unsigned long pgoff)
78 return do_mmap2(addr, len, prot, flags, fd, pgoff);
82 * Perform the select(nd, in, out, ex, tv) and mmap() system
83 * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
84 * handle more than 4 system call parameters, so these system calls
85 * used a memory block for parameter passing..
88 struct mmap_arg_struct {
97 asmlinkage int old_mmap(struct mmap_arg_struct *arg)
99 struct mmap_arg_struct a;
102 if (copy_from_user(&a, arg, sizeof(a)))
106 if (a.offset & ~PAGE_MASK)
109 a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
111 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
116 struct sel_arg_struct {
118 fd_set *inp, *outp, *exp;
122 asmlinkage int old_select(struct sel_arg_struct *arg)
124 struct sel_arg_struct a;
126 if (copy_from_user(&a, arg, sizeof(a)))
128 /* sys_select() does the appropriate kernel locking */
129 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
133 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
135 * This is really horribly ugly.
137 asmlinkage int sys_ipc (uint call, int first, int second,
138 int third, void *ptr, long fifth)
142 version = call >> 16; /* hack for backward compatibility */
148 return sys_semop (first, (struct sembuf *)ptr, second);
150 return sys_semget (first, second, third);
155 if (get_user(fourth.__pad, (void **) ptr))
157 return sys_semctl (first, second, third, fourth);
165 return sys_msgsnd (first, (struct msgbuf *) ptr,
170 struct ipc_kludge tmp;
173 if (copy_from_user (&tmp,
174 (struct ipc_kludge *)ptr,
177 return sys_msgrcv (first, tmp.msgp, second,
181 return sys_msgrcv (first,
182 (struct msgbuf *) ptr,
183 second, fifth, third);
186 return sys_msgget ((key_t) first, second);
188 return sys_msgctl (first, second,
189 (struct msqid_ds *) ptr);
197 /* sys_cacheflush -- flush (part of) the processor cache. */
199 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
205 asmlinkage int sys_getpagesize(void)
211 * Do a system call from kernel instead of calling sys_execve so we
212 * end up with proper pt_regs.
214 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
216 register long __res asm ("%d0") = __NR_execve;
217 register long __a asm ("%d1") = (long)(filename);
218 register long __b asm ("%d2") = (long)(argv);
219 register long __c asm ("%d3") = (long)(envp);
220 asm volatile ("trap #0" : "+d" (__res)
221 : "d" (__a), "d" (__b), "d" (__c));