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-rw-r--r--arch/arm26/kernel/sys_arm.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/arch/arm26/kernel/sys_arm.c b/arch/arm26/kernel/sys_arm.c
new file mode 100644
index 000000000000..e7edd201579a
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+++ b/arch/arm26/kernel/sys_arm.c
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1/*
2 * linux/arch/arm26/kernel/sys_arm.c
3 *
4 * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c
5 * Copyright (C) 1995, 1996 Russell King.
6 * Copyright (C) 2003 Ian Molton.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This file contains various random system calls that
13 * have a non-standard calling sequence on the Linux/arm
14 * platform.
15 */
16#include <linux/module.h>
17#include <linux/errno.h>
18#include <linux/sched.h>
19#include <linux/slab.h>
20#include <linux/mm.h>
21#include <linux/sem.h>
22#include <linux/msg.h>
23#include <linux/shm.h>
24#include <linux/stat.h>
25#include <linux/syscalls.h>
26#include <linux/mman.h>
27#include <linux/fs.h>
28#include <linux/file.h>
29#include <linux/utsname.h>
30
31#include <asm/uaccess.h>
32#include <asm/ipc.h>
33
34extern unsigned long do_mremap(unsigned long addr, unsigned long old_len,
35 unsigned long new_len, unsigned long flags,
36 unsigned long new_addr);
37
38/*
39 * sys_pipe() is the normal C calling standard for creating
40 * a pipe. It's not the way unix traditionally does this, though.
41 */
42asmlinkage int sys_pipe(unsigned long * fildes)
43{
44 int fd[2];
45 int error;
46
47 error = do_pipe(fd);
48 if (!error) {
49 if (copy_to_user(fildes, fd, 2*sizeof(int)))
50 error = -EFAULT;
51 }
52 return error;
53}
54
55/* common code for old and new mmaps */
56inline long do_mmap2(
57 unsigned long addr, unsigned long len,
58 unsigned long prot, unsigned long flags,
59 unsigned long fd, unsigned long pgoff)
60{
61 int error = -EINVAL;
62 struct file * file = NULL;
63
64 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
65
66 /*
67 * If we are doing a fixed mapping, and address < PAGE_SIZE,
68 * then deny it.
69 */
70 if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
71 goto out;
72
73 error = -EBADF;
74 if (!(flags & MAP_ANONYMOUS)) {
75 file = fget(fd);
76 if (!file)
77 goto out;
78 }
79
80 down_write(&current->mm->mmap_sem);
81 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
82 up_write(&current->mm->mmap_sem);
83
84 if (file)
85 fput(file);
86out:
87 return error;
88}
89
90struct mmap_arg_struct {
91 unsigned long addr;
92 unsigned long len;
93 unsigned long prot;
94 unsigned long flags;
95 unsigned long fd;
96 unsigned long offset;
97};
98
99asmlinkage int old_mmap(struct mmap_arg_struct *arg)
100{
101 int error = -EFAULT;
102 struct mmap_arg_struct a;
103
104 if (copy_from_user(&a, arg, sizeof(a)))
105 goto out;
106
107 error = -EINVAL;
108 if (a.offset & ~PAGE_MASK)
109 goto out;
110
111 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
112out:
113 return error;
114}
115
116asmlinkage unsigned long
117sys_arm_mremap(unsigned long addr, unsigned long old_len,
118 unsigned long new_len, unsigned long flags,
119 unsigned long new_addr)
120{
121 unsigned long ret = -EINVAL;
122
123 /*
124 * If we are doing a fixed mapping, and address < PAGE_SIZE,
125 * then deny it.
126 */
127 if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
128 vectors_base() == 0)
129 goto out;
130
131 down_write(&current->mm->mmap_sem);
132 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
133 up_write(&current->mm->mmap_sem);
134
135out:
136 return ret;
137}
138
139/*
140 * Perform the select(nd, in, out, ex, tv) and mmap() system
141 * calls.
142 */
143
144struct sel_arg_struct {
145 unsigned long n;
146 fd_set *inp, *outp, *exp;
147 struct timeval *tvp;
148};
149
150asmlinkage int old_select(struct sel_arg_struct *arg)
151{
152 struct sel_arg_struct a;
153
154 if (copy_from_user(&a, arg, sizeof(a)))
155 return -EFAULT;
156 /* sys_select() does the appropriate kernel locking */
157 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
158}
159
160/*
161 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
162 *
163 * This is really horribly ugly.
164 */
165asmlinkage int sys_ipc (uint call, int first, int second, int third, void *ptr, long fifth)
166{
167 int version, ret;
168
169 version = call >> 16; /* hack for backward compatibility */
170 call &= 0xffff;
171
172 switch (call) {
173 case SEMOP:
174 return sys_semop (first, (struct sembuf *)ptr, second);
175 case SEMGET:
176 return sys_semget (first, second, third);
177 case SEMCTL: {
178 union semun fourth;
179 if (!ptr)
180 return -EINVAL;
181 if (get_user(fourth.__pad, (void **) ptr))
182 return -EFAULT;
183 return sys_semctl (first, second, third, fourth);
184 }
185
186 case MSGSND:
187 return sys_msgsnd (first, (struct msgbuf *) ptr,
188 second, third);
189 case MSGRCV:
190 switch (version) {
191 case 0: {
192 struct ipc_kludge tmp;
193 if (!ptr)
194 return -EINVAL;
195 if (copy_from_user(&tmp,(struct ipc_kludge *) ptr,
196 sizeof (tmp)))
197 return -EFAULT;
198 return sys_msgrcv (first, tmp.msgp, second,
199 tmp.msgtyp, third);
200 }
201 default:
202 return sys_msgrcv (first,
203 (struct msgbuf *) ptr,
204 second, fifth, third);
205 }
206 case MSGGET:
207 return sys_msgget ((key_t) first, second);
208 case MSGCTL:
209 return sys_msgctl (first, second, (struct msqid_ds *) ptr);
210
211 case SHMAT:
212 switch (version) {
213 default: {
214 ulong raddr;
215 ret = do_shmat (first, (char *) ptr, second, &raddr);
216 if (ret)
217 return ret;
218 return put_user (raddr, (ulong *) third);
219 }
220 case 1: /* iBCS2 emulator entry point */
221 if (!segment_eq(get_fs(), get_ds()))
222 return -EINVAL;
223 return do_shmat (first, (char *) ptr,
224 second, (ulong *) third);
225 }
226 case SHMDT:
227 return sys_shmdt ((char *)ptr);
228 case SHMGET:
229 return sys_shmget (first, second, third);
230 case SHMCTL:
231 return sys_shmctl (first, second,
232 (struct shmid_ds *) ptr);
233 default:
234 return -EINVAL;
235 }
236}
237
238/* Fork a new task - this creates a new program thread.
239 * This is called indirectly via a small wrapper
240 */
241asmlinkage int sys_fork(struct pt_regs *regs)
242{
243 return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
244}
245
246/* Clone a task - this clones the calling program thread.
247 * This is called indirectly via a small wrapper
248 */
249asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, struct pt_regs *regs)
250{
251 /*
252 * We don't support SETTID / CLEARTID (FIXME!!! (nicked from arm32))
253 */
254 if (clone_flags & (CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID))
255 return -EINVAL;
256
257 if (!newsp)
258 newsp = regs->ARM_sp;
259
260 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
261}
262
263asmlinkage int sys_vfork(struct pt_regs *regs)
264{
265 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL);
266}
267
268/* sys_execve() executes a new program.
269 * This is called indirectly via a small wrapper
270 */
271asmlinkage int sys_execve(char *filenamei, char **argv, char **envp, struct pt_regs *regs)
272{
273 int error;
274 char * filename;
275
276 filename = getname(filenamei);
277 error = PTR_ERR(filename);
278 if (IS_ERR(filename))
279 goto out;
280 error = do_execve(filename, argv, envp, regs);
281 putname(filename);
282out:
283 return error;
284}
285
286/* FIXME - see if this is correct for arm26 */
287long execve(const char *filename, char **argv, char **envp)
288{
289 struct pt_regs regs;
290 int ret;
291 memset(&regs, 0, sizeof(struct pt_regs));
292 ret = do_execve((char *)filename, (char __user * __user *)argv, (char __user * __user *)envp, &regs);
293 if (ret < 0)
294 goto out;
295
296 /*
297 * Save argc to the register structure for userspace.
298 */
299 regs.ARM_r0 = ret;
300
301 /*
302 * We were successful. We won't be returning to our caller, but
303 * instead to user space by manipulating the kernel stack.
304 */
305 asm( "add r0, %0, %1\n\t"
306 "mov r1, %2\n\t"
307 "mov r2, %3\n\t"
308 "bl memmove\n\t" /* copy regs to top of stack */
309 "mov r8, #0\n\t" /* not a syscall */
310 "mov r9, %0\n\t" /* thread structure */
311 "mov sp, r0\n\t" /* reposition stack pointer */
312 "b ret_to_user"
313 :
314 : "r" (current_thread_info()),
315 "Ir" (THREAD_SIZE - 8 - sizeof(regs)),
316 "r" (&regs),
317 "Ir" (sizeof(regs))
318 : "r0", "r1", "r2", "r3", "ip", "memory");
319
320 out:
321 return ret;
322}
323
324EXPORT_SYMBOL(execve);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 19:36:10 -0500