aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/sys_i386_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/sys_i386_32.c')
-rw-r--r--arch/x86/kernel/sys_i386_32.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/arch/x86/kernel/sys_i386_32.c b/arch/x86/kernel/sys_i386_32.c
new file mode 100644
index 000000000000..42147304de88
--- /dev/null
+++ b/arch/x86/kernel/sys_i386_32.c
@@ -0,0 +1,265 @@
1/*
2 * linux/arch/i386/kernel/sys_i386.c
3 *
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/i386
6 * platform.
7 */
8
9#include <linux/errno.h>
10#include <linux/sched.h>
11#include <linux/mm.h>
12#include <linux/fs.h>
13#include <linux/smp.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/uaccess.h>
24#include <asm/unistd.h>
25#include <asm/ipc.h>
26
27/*
28 * sys_pipe() is the normal C calling standard for creating
29 * a pipe. It's not the way Unix traditionally does this, though.
30 */
31asmlinkage int sys_pipe(unsigned long __user * fildes)
32{
33 int fd[2];
34 int error;
35
36 error = do_pipe(fd);
37 if (!error) {
38 if (copy_to_user(fildes, fd, 2*sizeof(int)))
39 error = -EFAULT;
40 }
41 return error;
42}
43
44asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
45 unsigned long prot, unsigned long flags,
46 unsigned long fd, unsigned long pgoff)
47{
48 int error = -EBADF;
49 struct file *file = NULL;
50 struct mm_struct *mm = current->mm;
51
52 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
53 if (!(flags & MAP_ANONYMOUS)) {
54 file = fget(fd);
55 if (!file)
56 goto out;
57 }
58
59 down_write(&mm->mmap_sem);
60 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
61 up_write(&mm->mmap_sem);
62
63 if (file)
64 fput(file);
65out:
66 return error;
67}
68
69/*
70 * Perform the select(nd, in, out, ex, tv) and mmap() system
71 * calls. Linux/i386 didn't use to be able to handle more than
72 * 4 system call parameters, so these system calls used a memory
73 * block for parameter passing..
74 */
75
76struct mmap_arg_struct {
77 unsigned long addr;
78 unsigned long len;
79 unsigned long prot;
80 unsigned long flags;
81 unsigned long fd;
82 unsigned long offset;
83};
84
85asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
86{
87 struct mmap_arg_struct a;
88 int err = -EFAULT;
89
90 if (copy_from_user(&a, arg, sizeof(a)))
91 goto out;
92
93 err = -EINVAL;
94 if (a.offset & ~PAGE_MASK)
95 goto out;
96
97 err = sys_mmap2(a.addr, a.len, a.prot, a.flags,
98 a.fd, a.offset >> PAGE_SHIFT);
99out:
100 return err;
101}
102
103
104struct sel_arg_struct {
105 unsigned long n;
106 fd_set __user *inp, *outp, *exp;
107 struct timeval __user *tvp;
108};
109
110asmlinkage int old_select(struct sel_arg_struct __user *arg)
111{
112 struct sel_arg_struct a;
113
114 if (copy_from_user(&a, arg, sizeof(a)))
115 return -EFAULT;
116 /* sys_select() does the appropriate kernel locking */
117 return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
118}
119
120/*
121 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
122 *
123 * This is really horribly ugly.
124 */
125asmlinkage int sys_ipc (uint call, int first, int second,
126 int third, void __user *ptr, long fifth)
127{
128 int version, ret;
129
130 version = call >> 16; /* hack for backward compatibility */
131 call &= 0xffff;
132
133 switch (call) {
134 case SEMOP:
135 return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
136 case SEMTIMEDOP:
137 return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
138 (const struct timespec __user *)fifth);
139
140 case SEMGET:
141 return sys_semget (first, second, third);
142 case SEMCTL: {
143 union semun fourth;
144 if (!ptr)
145 return -EINVAL;
146 if (get_user(fourth.__pad, (void __user * __user *) ptr))
147 return -EFAULT;
148 return sys_semctl (first, second, third, fourth);
149 }
150
151 case MSGSND:
152 return sys_msgsnd (first, (struct msgbuf __user *) ptr,
153 second, third);
154 case MSGRCV:
155 switch (version) {
156 case 0: {
157 struct ipc_kludge tmp;
158 if (!ptr)
159 return -EINVAL;
160
161 if (copy_from_user(&tmp,
162 (struct ipc_kludge __user *) ptr,
163 sizeof (tmp)))
164 return -EFAULT;
165 return sys_msgrcv (first, tmp.msgp, second,
166 tmp.msgtyp, third);
167 }
168 default:
169 return sys_msgrcv (first,
170 (struct msgbuf __user *) ptr,
171 second, fifth, third);
172 }
173 case MSGGET:
174 return sys_msgget ((key_t) first, second);
175 case MSGCTL:
176 return sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
177
178 case SHMAT:
179 switch (version) {
180 default: {
181 ulong raddr;
182 ret = do_shmat (first, (char __user *) ptr, second, &raddr);
183 if (ret)
184 return ret;
185 return put_user (raddr, (ulong __user *) third);
186 }
187 case 1: /* iBCS2 emulator entry point */
188 if (!segment_eq(get_fs(), get_ds()))
189 return -EINVAL;
190 /* The "(ulong *) third" is valid _only_ because of the kernel segment thing */
191 return do_shmat (first, (char __user *) ptr, second, (ulong *) third);
192 }
193 case SHMDT:
194 return sys_shmdt ((char __user *)ptr);
195 case SHMGET:
196 return sys_shmget (first, second, third);
197 case SHMCTL:
198 return sys_shmctl (first, second,
199 (struct shmid_ds __user *) ptr);
200 default:
201 return -ENOSYS;
202 }
203}
204
205/*
206 * Old cruft
207 */
208asmlinkage int sys_uname(struct old_utsname __user * name)
209{
210 int err;
211 if (!name)
212 return -EFAULT;
213 down_read(&uts_sem);
214 err = copy_to_user(name, utsname(), sizeof (*name));
215 up_read(&uts_sem);
216 return err?-EFAULT:0;
217}
218
219asmlinkage int sys_olduname(struct oldold_utsname __user * name)
220{
221 int error;
222
223 if (!name)
224 return -EFAULT;
225 if (!access_ok(VERIFY_WRITE,name,sizeof(struct oldold_utsname)))
226 return -EFAULT;
227
228 down_read(&uts_sem);
229
230 error = __copy_to_user(&name->sysname, &utsname()->sysname,
231 __OLD_UTS_LEN);
232 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
233 error |= __copy_to_user(&name->nodename, &utsname()->nodename,
234 __OLD_UTS_LEN);
235 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
236 error |= __copy_to_user(&name->release, &utsname()->release,
237 __OLD_UTS_LEN);
238 error |= __put_user(0, name->release + __OLD_UTS_LEN);
239 error |= __copy_to_user(&name->version, &utsname()->version,
240 __OLD_UTS_LEN);
241 error |= __put_user(0, name->version + __OLD_UTS_LEN);
242 error |= __copy_to_user(&name->machine, &utsname()->machine,
243 __OLD_UTS_LEN);
244 error |= __put_user(0, name->machine + __OLD_UTS_LEN);
245
246 up_read(&uts_sem);
247
248 error = error ? -EFAULT : 0;
249
250 return error;
251}
252
253
254/*
255 * Do a system call from kernel instead of calling sys_execve so we
256 * end up with proper pt_regs.
257 */
258int kernel_execve(const char *filename, char *const argv[], char *const envp[])
259{
260 long __res;
261 asm volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx"
262 : "=a" (__res)
263 : "0" (__NR_execve),"ri" (filename),"c" (argv), "d" (envp) : "memory");
264 return __res;
265}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 18:34:48 -0500