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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> | |
1da177e4 LT |
18 | #include <linux/mm.h> |
19 | #include <linux/sem.h> | |
20 | #include <linux/msg.h> | |
21 | #include <linux/shm.h> | |
22 | #include <linux/stat.h> | |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/mman.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/file.h> | |
cba4fbbf | 27 | #include <linux/ipc.h> |
33fa9b13 | 28 | #include <linux/uaccess.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | /* Fork a new task - this creates a new program thread. |
32 | * This is called indirectly via a small wrapper | |
33 | */ | |
34 | asmlinkage int sys_fork(struct pt_regs *regs) | |
35 | { | |
f24284ad | 36 | #ifdef CONFIG_MMU |
1da177e4 | 37 | return do_fork(SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); |
f24284ad HC |
38 | #else |
39 | /* can not support in nommu mode */ | |
40 | return(-EINVAL); | |
41 | #endif | |
1da177e4 LT |
42 | } |
43 | ||
44 | /* Clone a task - this clones the calling program thread. | |
45 | * This is called indirectly via a small wrapper | |
46 | */ | |
47 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, | |
48 | int __user *parent_tidptr, int tls_val, | |
49 | int __user *child_tidptr, struct pt_regs *regs) | |
50 | { | |
51 | if (!newsp) | |
52 | newsp = regs->ARM_sp; | |
53 | ||
54 | return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); | |
55 | } | |
56 | ||
57 | asmlinkage int sys_vfork(struct pt_regs *regs) | |
58 | { | |
59 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->ARM_sp, regs, 0, NULL, NULL); | |
60 | } | |
61 | ||
62 | /* sys_execve() executes a new program. | |
63 | * This is called indirectly via a small wrapper | |
64 | */ | |
d7627467 DH |
65 | asmlinkage int sys_execve(const char __user *filenamei, |
66 | const char __user *const __user *argv, | |
67 | const char __user *const __user *envp, struct pt_regs *regs) | |
1da177e4 LT |
68 | { |
69 | int error; | |
70 | char * filename; | |
71 | ||
72 | filename = getname(filenamei); | |
73 | error = PTR_ERR(filename); | |
74 | if (IS_ERR(filename)) | |
75 | goto out; | |
76 | error = do_execve(filename, argv, envp, regs); | |
77 | putname(filename); | |
78 | out: | |
79 | return error; | |
80 | } | |
81 | ||
d7627467 DH |
82 | int kernel_execve(const char *filename, |
83 | const char *const argv[], | |
84 | const char *const envp[]) | |
1da177e4 LT |
85 | { |
86 | struct pt_regs regs; | |
87 | int ret; | |
88 | ||
89 | memset(®s, 0, sizeof(struct pt_regs)); | |
d7627467 DH |
90 | ret = do_execve(filename, |
91 | (const char __user *const __user *)argv, | |
92 | (const char __user *const __user *)envp, ®s); | |
1da177e4 LT |
93 | if (ret < 0) |
94 | goto out; | |
95 | ||
96 | /* | |
97 | * Save argc to the register structure for userspace. | |
98 | */ | |
99 | regs.ARM_r0 = ret; | |
100 | ||
101 | /* | |
102 | * We were successful. We won't be returning to our caller, but | |
103 | * instead to user space by manipulating the kernel stack. | |
104 | */ | |
105 | asm( "add r0, %0, %1\n\t" | |
106 | "mov r1, %2\n\t" | |
107 | "mov r2, %3\n\t" | |
108 | "bl memmove\n\t" /* copy regs to top of stack */ | |
109 | "mov r8, #0\n\t" /* not a syscall */ | |
110 | "mov r9, %0\n\t" /* thread structure */ | |
111 | "mov sp, r0\n\t" /* reposition stack pointer */ | |
112 | "b ret_to_user" | |
113 | : | |
114 | : "r" (current_thread_info()), | |
4f7a1812 | 115 | "Ir" (THREAD_START_SP - sizeof(regs)), |
1da177e4 LT |
116 | "r" (®s), |
117 | "Ir" (sizeof(regs)) | |
c2f48086 | 118 | : "r0", "r1", "r2", "r3", "ip", "lr", "memory"); |
1da177e4 LT |
119 | |
120 | out: | |
121 | return ret; | |
122 | } | |
3db03b4a | 123 | EXPORT_SYMBOL(kernel_execve); |
68d9102f NP |
124 | |
125 | /* | |
6cbdc8c5 | 126 | * Since loff_t is a 64 bit type we avoid a lot of ABI hassle |
68d9102f NP |
127 | * with a different argument ordering. |
128 | */ | |
129 | asmlinkage long sys_arm_fadvise64_64(int fd, int advice, | |
130 | loff_t offset, loff_t len) | |
131 | { | |
132 | return sys_fadvise64_64(fd, offset, len, advice); | |
133 | } |