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1da177e4 LT |
1 | /* |
2 | * arch/v850/kernel/syscalls.c -- Various system-call definitions not | |
3 | * defined in machine-independent code | |
4 | * | |
5 | * Copyright (C) 2001,02 NEC Corporation | |
6 | * Copyright (C) 2001,02 Miles Bader <miles@gnu.org> | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General | |
9 | * Public License. See the file COPYING in the main directory of this | |
10 | * archive for more details. | |
11 | * | |
12 | * This file was derived the ppc version, arch/ppc/kernel/syscalls.c | |
13 | * ... which was derived from "arch/i386/kernel/sys_i386.c" by Gary Thomas; | |
14 | * modified by Cort Dougan (cort@cs.nmt.edu) | |
15 | * and Paul Mackerras (paulus@cs.anu.edu.au). | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/errno.h> |
19 | #include <linux/mm.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/smp_lock.h> | |
22 | #include <linux/syscalls.h> | |
23 | #include <linux/sem.h> | |
24 | #include <linux/msg.h> | |
25 | #include <linux/shm.h> | |
26 | #include <linux/stat.h> | |
27 | #include <linux/mman.h> | |
28 | #include <linux/sys.h> | |
29 | #include <linux/ipc.h> | |
30 | #include <linux/utsname.h> | |
31 | #include <linux/file.h> | |
32 | ||
33 | #include <asm/uaccess.h> | |
34 | #include <asm/ipc.h> | |
35 | #include <asm/semaphore.h> | |
fe74290d | 36 | #include <asm/unistd.h> |
1da177e4 LT |
37 | |
38 | /* | |
39 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
40 | * | |
41 | * This is really horribly ugly. | |
42 | */ | |
43 | int | |
44 | sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth) | |
45 | { | |
46 | int version, ret; | |
47 | ||
48 | version = call >> 16; /* hack for backward compatibility */ | |
49 | call &= 0xffff; | |
50 | ||
51 | ret = -EINVAL; | |
52 | switch (call) { | |
53 | case SEMOP: | |
54 | ret = sys_semop (first, (struct sembuf *)ptr, second); | |
55 | break; | |
56 | case SEMGET: | |
57 | ret = sys_semget (first, second, third); | |
58 | break; | |
59 | case SEMCTL: | |
60 | { | |
61 | union semun fourth; | |
62 | ||
63 | if (!ptr) | |
64 | break; | |
65 | if ((ret = access_ok(VERIFY_READ, ptr, sizeof(long)) ? 0 : -EFAULT) | |
66 | || (ret = get_user(fourth.__pad, (void **)ptr))) | |
67 | break; | |
68 | ret = sys_semctl (first, second, third, fourth); | |
69 | break; | |
70 | } | |
71 | case MSGSND: | |
72 | ret = sys_msgsnd (first, (struct msgbuf *) ptr, second, third); | |
73 | break; | |
74 | case MSGRCV: | |
75 | switch (version) { | |
76 | case 0: { | |
77 | struct ipc_kludge tmp; | |
78 | ||
79 | if (!ptr) | |
80 | break; | |
81 | if ((ret = access_ok(VERIFY_READ, ptr, sizeof(tmp)) ? 0 : -EFAULT) | |
82 | || (ret = copy_from_user(&tmp, | |
83 | (struct ipc_kludge *) ptr, | |
84 | sizeof (tmp)))) | |
85 | break; | |
86 | ret = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, | |
87 | third); | |
88 | break; | |
89 | } | |
90 | default: | |
91 | ret = sys_msgrcv (first, (struct msgbuf *) ptr, | |
92 | second, fifth, third); | |
93 | break; | |
94 | } | |
95 | break; | |
96 | case MSGGET: | |
97 | ret = sys_msgget ((key_t) first, second); | |
98 | break; | |
99 | case MSGCTL: | |
100 | ret = sys_msgctl (first, second, (struct msqid_ds *) ptr); | |
101 | break; | |
102 | case SHMAT: | |
103 | switch (version) { | |
104 | default: { | |
105 | ulong raddr; | |
106 | ||
107 | if ((ret = access_ok(VERIFY_WRITE, (ulong*) third, | |
108 | sizeof(ulong)) ? 0 : -EFAULT)) | |
109 | break; | |
110 | ret = do_shmat (first, (char *) ptr, second, &raddr); | |
111 | if (ret) | |
112 | break; | |
113 | ret = put_user (raddr, (ulong *) third); | |
114 | break; | |
115 | } | |
116 | case 1: /* iBCS2 emulator entry point */ | |
117 | if (!segment_eq(get_fs(), get_ds())) | |
118 | break; | |
119 | ret = do_shmat (first, (char *) ptr, second, | |
120 | (ulong *) third); | |
121 | break; | |
122 | } | |
123 | break; | |
124 | case SHMDT: | |
125 | ret = sys_shmdt ((char *)ptr); | |
126 | break; | |
127 | case SHMGET: | |
128 | ret = sys_shmget (first, second, third); | |
129 | break; | |
130 | case SHMCTL: | |
131 | ret = sys_shmctl (first, second, (struct shmid_ds *) ptr); | |
132 | break; | |
133 | } | |
134 | ||
135 | return ret; | |
136 | } | |
137 | ||
138 | /* | |
139 | * sys_pipe() is the normal C calling standard for creating | |
140 | * a pipe. It's not the way unix traditionally does this, though. | |
141 | */ | |
142 | int sys_pipe (int *fildes) | |
143 | { | |
144 | int fd[2]; | |
145 | int error; | |
146 | ||
147 | error = do_pipe (fd); | |
148 | if (!error) { | |
149 | if (copy_to_user (fildes, fd, 2*sizeof (int))) | |
150 | error = -EFAULT; | |
151 | } | |
152 | return error; | |
153 | } | |
154 | ||
155 | static inline unsigned long | |
156 | do_mmap2 (unsigned long addr, size_t len, | |
157 | unsigned long prot, unsigned long flags, | |
158 | unsigned long fd, unsigned long pgoff) | |
159 | { | |
160 | struct file * file = NULL; | |
161 | int ret = -EBADF; | |
162 | ||
163 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); | |
164 | if (! (flags & MAP_ANONYMOUS)) { | |
165 | if (!(file = fget (fd))) | |
166 | goto out; | |
167 | } | |
168 | ||
169 | down_write (¤t->mm->mmap_sem); | |
170 | ret = do_mmap_pgoff (file, addr, len, prot, flags, pgoff); | |
171 | up_write (¤t->mm->mmap_sem); | |
172 | if (file) | |
173 | fput (file); | |
174 | out: | |
175 | return ret; | |
176 | } | |
177 | ||
178 | unsigned long sys_mmap2 (unsigned long addr, size_t len, | |
179 | unsigned long prot, unsigned long flags, | |
180 | unsigned long fd, unsigned long pgoff) | |
181 | { | |
182 | return do_mmap2 (addr, len, prot, flags, fd, pgoff); | |
183 | } | |
184 | ||
185 | unsigned long sys_mmap (unsigned long addr, size_t len, | |
186 | unsigned long prot, unsigned long flags, | |
187 | unsigned long fd, off_t offset) | |
188 | { | |
189 | int err = -EINVAL; | |
190 | ||
191 | if (offset & ~PAGE_MASK) | |
192 | goto out; | |
193 | ||
194 | err = do_mmap2 (addr, len, prot, flags, fd, offset >> PAGE_SHIFT); | |
195 | out: | |
196 | return err; | |
197 | } | |
fe74290d AB |
198 | |
199 | /* | |
200 | * Do a system call from kernel instead of calling sys_execve so we | |
201 | * end up with proper pt_regs. | |
202 | */ | |
203 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) | |
204 | { | |
205 | register char *__a __asm__ ("r6") = filename; | |
206 | register void *__b __asm__ ("r7") = argv; | |
207 | register void *__c __asm__ ("r8") = envp; | |
208 | register unsigned long __syscall __asm__ ("r12") = __NR_execve; | |
209 | register unsigned long __ret __asm__ ("r10"); | |
210 | __asm__ __volatile__ ("trap 0" | |
211 | : "=r" (__ret), "=r" (__syscall) | |
212 | : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c) | |
213 | : "r1", "r5", "r11", "r13", "r14", | |
214 | "r15", "r16", "r17", "r18", "r19"); | |
215 | return __ret; | |
216 | } |