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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/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 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This file contains various random system calls that | |
12 | * have a non-standard calling sequence on the Linux/arm | |
13 | * platform. | |
14 | */ | |
15 | #include <linux/module.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/sem.h> | |
21 | #include <linux/msg.h> | |
22 | #include <linux/shm.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/syscalls.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/file.h> | |
cba4fbbf | 28 | #include <linux/ipc.h> |
33fa9b13 | 29 | #include <linux/uaccess.h> |
1da177e4 | 30 | |
dd35afc2 | 31 | #if !defined(CONFIG_AEABI) || defined(CONFIG_OABI_COMPAT) |
1da177e4 LT |
32 | /* |
33 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. | |
34 | * | |
35 | * This is really horribly ugly. | |
36 | */ | |
37 | asmlinkage int sys_ipc(uint call, int first, int second, int third, | |
38 | void __user *ptr, long fifth) | |
39 | { | |
40 | int version, ret; | |
41 | ||
42 | version = call >> 16; /* hack for backward compatibility */ | |
43 | call &= 0xffff; | |
44 | ||
45 | switch (call) { | |
46 | case SEMOP: | |
47 | return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL); | |
48 | case SEMTIMEDOP: | |
49 | return sys_semtimedop(first, (struct sembuf __user *)ptr, second, | |
50 | (const struct timespec __user *)fifth); | |
51 | ||
52 | case SEMGET: | |
53 | return sys_semget (first, second, third); | |
54 | case SEMCTL: { | |
55 | union semun fourth; | |
56 | if (!ptr) | |
57 | return -EINVAL; | |
58 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) | |
59 | return -EFAULT; | |
60 | return sys_semctl (first, second, third, fourth); | |
61 | } | |
62 | ||
63 | case MSGSND: | |
64 | return sys_msgsnd(first, (struct msgbuf __user *) ptr, | |
65 | second, third); | |
66 | case MSGRCV: | |
67 | switch (version) { | |
68 | case 0: { | |
69 | struct ipc_kludge tmp; | |
70 | if (!ptr) | |
71 | return -EINVAL; | |
72 | if (copy_from_user(&tmp,(struct ipc_kludge __user *)ptr, | |
73 | sizeof (tmp))) | |
74 | return -EFAULT; | |
75 | return sys_msgrcv (first, tmp.msgp, second, | |
76 | tmp.msgtyp, third); | |
77 | } | |
78 | default: | |
79 | return sys_msgrcv (first, | |
80 | (struct msgbuf __user *) ptr, | |
81 | second, fifth, third); | |
82 | } | |
83 | case MSGGET: | |
84 | return sys_msgget ((key_t) first, second); | |
85 | case MSGCTL: | |
86 | return sys_msgctl(first, second, (struct msqid_ds __user *)ptr); | |
87 | ||
88 | case SHMAT: | |
89 | switch (version) { | |
90 | default: { | |
91 | ulong raddr; | |
92 | ret = do_shmat(first, (char __user *)ptr, second, &raddr); | |
93 | if (ret) | |
94 | return ret; | |
95 | return put_user(raddr, (ulong __user *)third); | |
96 | } | |
97 | case 1: /* Of course, we don't support iBCS2! */ | |
98 | return -EINVAL; | |
99 | } | |
100 | case SHMDT: | |
101 | return sys_shmdt ((char __user *)ptr); | |
102 | case SHMGET: | |
103 | return sys_shmget (first, second, third); | |
104 | case SHMCTL: | |
105 | return sys_shmctl (first, second, | |
106 | (struct shmid_ds __user *) ptr); | |
107 | default: | |
108 | return -ENOSYS; | |
109 | } | |
110 | } | |
dd35afc2 | 111 | #endif |
1da177e4 | 112 | |
1da177e4 LT |
113 | /* Fork a new task - this creates a new program thread. |
114 | * This is called indirectly via a small wrapper | |
115 | */ | |
116 | asmlinkage int sys_fork(struct pt_regs *regs) | |
117 | { | |
f24284ad | 118 | #ifdef CONFIG_MMU |
1da177e4 | 119 | return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); |
f24284ad HC |
120 | #else |
121 | /* can not support in nommu mode */ | |
122 | return(-EINVAL); | |
123 | #endif | |
1da177e4 LT |
124 | } |
125 | ||
126 | /* Clone a task - this clones the calling program thread. | |
127 | * This is called indirectly via a small wrapper | |
128 | */ | |
129 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
130 | int __user *parent_tidptr, int tls_val, | |
131 | int __user *child_tidptr, struct pt_regs *regs) | |
132 | { | |
133 | if (!newsp) | |
134 | newsp = regs->ARM_sp; | |
135 | ||
136 | return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); | |
137 | } | |
138 | ||
139 | asmlinkage int sys_vfork(struct pt_regs *regs) | |
140 | { | |
141 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); | |
142 | } | |
143 | ||
144 | /* sys_execve() executes a new program. | |
145 | * This is called indirectly via a small wrapper | |
146 | */ | |
147 | asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv, | |
148 | char __user * __user *envp, struct pt_regs *regs) | |
149 | { | |
150 | int error; | |
151 | char * filename; | |
152 | ||
153 | filename = getname(filenamei); | |
154 | error = PTR_ERR(filename); | |
155 | if (IS_ERR(filename)) | |
156 | goto out; | |
157 | error = do_execve(filename, argv, envp, regs); | |
158 | putname(filename); | |
159 | out: | |
160 | return error; | |
161 | } | |
162 | ||
3db03b4a | 163 | int kernel_execve(const char *filename, char *const argv[], char *const envp[]) |
1da177e4 LT |
164 | { |
165 | struct pt_regs regs; | |
166 | int ret; | |
167 | ||
168 | memset(®s, 0, sizeof(struct pt_regs)); | |
169 | ret = do_execve((char *)filename, (char __user * __user *)argv, | |
170 | (char __user * __user *)envp, ®s); | |
171 | if (ret < 0) | |
172 | goto out; | |
173 | ||
174 | /* | |
175 | * Save argc to the register structure for userspace. | |
176 | */ | |
177 | regs.ARM_r0 = ret; | |
178 | ||
179 | /* | |
180 | * We were successful. We won't be returning to our caller, but | |
181 | * instead to user space by manipulating the kernel stack. | |
182 | */ | |
183 | asm( "add r0, %0, %1\n\t" | |
184 | "mov r1, %2\n\t" | |
185 | "mov r2, %3\n\t" | |
186 | "bl memmove\n\t" /* copy regs to top of stack */ | |
187 | "mov r8, #0\n\t" /* not a syscall */ | |
188 | "mov r9, %0\n\t" /* thread structure */ | |
189 | "mov sp, r0\n\t" /* reposition stack pointer */ | |
190 | "b ret_to_user" | |
191 | : | |
192 | : "r" (current_thread_info()), | |
4f7a1812 | 193 | "Ir" (THREAD_START_SP - sizeof(regs)), |
1da177e4 LT |
194 | "r" (®s), |
195 | "Ir" (sizeof(regs)) | |
c2f48086 | 196 | : "r0", "r1", "r2", "r3", "ip", "lr", "memory"); |
1da177e4 LT |
197 | |
198 | out: | |
199 | return ret; | |
200 | } | |
3db03b4a | 201 | EXPORT_SYMBOL(kernel_execve); |
68d9102f NP |
202 | |
203 | /* | |
6cbdc8c5 | 204 | * Since loff_t is a 64 bit type we avoid a lot of ABI hassle |
68d9102f NP |
205 | * with a different argument ordering. |
206 | */ | |
207 | asmlinkage long sys_arm_fadvise64_64(int fd, int advice, | |
208 | loff_t offset, loff_t len) | |
209 | { | |
210 | return sys_fadvise64_64(fd, offset, len, advice); | |
211 | } |