Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/arch/m68knommu/kernel/sys_m68k.c | |
3 | * | |
4 | * This file contains various random system calls that | |
5 | * have a non-standard calling sequence on the Linux/m68k | |
6 | * platform. | |
7 | */ | |
8 | ||
9 | #include <linux/errno.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/mm.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> | |
22 | ||
23 | #include <asm/setup.h> | |
24 | #include <asm/uaccess.h> | |
25 | #include <asm/cachectl.h> | |
26 | #include <asm/traps.h> | |
27 | #include <asm/ipc.h> | |
28 | #include <asm/cacheflush.h> | |
fe74290d | 29 | #include <asm/unistd.h> |
1da177e4 LT |
30 | |
31 | /* | |
32 | * sys_pipe() is the normal C calling standard for creating | |
33 | * a pipe. It's not the way unix traditionally does this, though. | |
34 | */ | |
35 | asmlinkage int sys_pipe(unsigned long * fildes) | |
36 | { | |
37 | int fd[2]; | |
38 | int error; | |
39 | ||
40 | error = do_pipe(fd); | |
41 | if (!error) { | |
42 | if (copy_to_user(fildes, fd, 2*sizeof(int))) | |
43 | error = -EFAULT; | |
44 | } | |
45 | return error; | |
46 | } | |
47 | ||
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) | |
53 | { | |
54 | int error = -EBADF; | |
55 | struct file * file = NULL; | |
56 | ||
57 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
58 | if (!(flags & MAP_ANONYMOUS)) { | |
59 | file = fget(fd); | |
60 | if (!file) | |
61 | goto out; | |
62 | } | |
63 | ||
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); | |
67 | ||
68 | if (file) | |
69 | fput(file); | |
70 | out: | |
71 | return error; | |
72 | } | |
73 | ||
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) | |
77 | { | |
78 | return do_mmap2(addr, len, prot, flags, fd, pgoff); | |
79 | } | |
80 | ||
81 | /* | |
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.. | |
86 | */ | |
87 | ||
88 | struct mmap_arg_struct { | |
89 | unsigned long addr; | |
90 | unsigned long len; | |
91 | unsigned long prot; | |
92 | unsigned long flags; | |
93 | unsigned long fd; | |
94 | unsigned long offset; | |
95 | }; | |
96 | ||
97 | asmlinkage int old_mmap(struct mmap_arg_struct *arg) | |
98 | { | |
99 | struct mmap_arg_struct a; | |
100 | int error = -EFAULT; | |
101 | ||
102 | if (copy_from_user(&a, arg, sizeof(a))) | |
103 | goto out; | |
104 | ||
105 | error = -EINVAL; | |
106 | if (a.offset & ~PAGE_MASK) | |
107 | goto out; | |
108 | ||
109 | a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
110 | ||
111 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); | |
112 | out: | |
113 | return error; | |
114 | } | |
115 | ||
116 | struct sel_arg_struct { | |
117 | unsigned long n; | |
118 | fd_set *inp, *outp, *exp; | |
119 | struct timeval *tvp; | |
120 | }; | |
121 | ||
122 | asmlinkage int old_select(struct sel_arg_struct *arg) | |
123 | { | |
124 | struct sel_arg_struct a; | |
125 | ||
126 | if (copy_from_user(&a, arg, sizeof(a))) | |
127 | return -EFAULT; | |
128 | /* sys_select() does the appropriate kernel locking */ | |
129 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); | |
130 | } | |
131 | ||
132 | /* | |
133 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
134 | * | |
135 | * This is really horribly ugly. | |
136 | */ | |
137 | asmlinkage int sys_ipc (uint call, int first, int second, | |
138 | int third, void *ptr, long fifth) | |
139 | { | |
140 | int version; | |
141 | ||
142 | version = call >> 16; /* hack for backward compatibility */ | |
143 | call &= 0xffff; | |
144 | ||
145 | if (call <= SEMCTL) | |
146 | switch (call) { | |
147 | case SEMOP: | |
148 | return sys_semop (first, (struct sembuf *)ptr, second); | |
149 | case SEMGET: | |
150 | return sys_semget (first, second, third); | |
151 | case SEMCTL: { | |
152 | union semun fourth; | |
153 | if (!ptr) | |
154 | return -EINVAL; | |
155 | if (get_user(fourth.__pad, (void **) ptr)) | |
156 | return -EFAULT; | |
157 | return sys_semctl (first, second, third, fourth); | |
158 | } | |
159 | default: | |
160 | return -EINVAL; | |
161 | } | |
162 | if (call <= MSGCTL) | |
163 | switch (call) { | |
164 | case MSGSND: | |
165 | return sys_msgsnd (first, (struct msgbuf *) ptr, | |
166 | second, third); | |
167 | case MSGRCV: | |
168 | switch (version) { | |
169 | case 0: { | |
170 | struct ipc_kludge tmp; | |
171 | if (!ptr) | |
172 | return -EINVAL; | |
173 | if (copy_from_user (&tmp, | |
174 | (struct ipc_kludge *)ptr, | |
175 | sizeof (tmp))) | |
176 | return -EFAULT; | |
177 | return sys_msgrcv (first, tmp.msgp, second, | |
178 | tmp.msgtyp, third); | |
179 | } | |
180 | default: | |
181 | return sys_msgrcv (first, | |
182 | (struct msgbuf *) ptr, | |
183 | second, fifth, third); | |
184 | } | |
185 | case MSGGET: | |
186 | return sys_msgget ((key_t) first, second); | |
187 | case MSGCTL: | |
188 | return sys_msgctl (first, second, | |
189 | (struct msqid_ds *) ptr); | |
190 | default: | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | /* sys_cacheflush -- flush (part of) the processor cache. */ | |
198 | asmlinkage int | |
199 | sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len) | |
200 | { | |
201 | flush_cache_all(); | |
202 | return(0); | |
203 | } | |
204 | ||
205 | asmlinkage int sys_getpagesize(void) | |
206 | { | |
207 | return PAGE_SIZE; | |
208 | } | |
209 | ||
fe74290d AB |
210 | /* |
211 | * Do a system call from kernel instead of calling sys_execve so we | |
212 | * end up with proper pt_regs. | |
213 | */ | |
214 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
215 | { | |
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)); | |
222 | return __res; | |
223 | } |